WO2014005396A1

WO2014005396A1 - Hydraulic system and excavator

Info

Publication number: WO2014005396A1
Application number: PCT/CN2012/085805
Authority: WO
Inventors: 陈锷; 杨文林; 闫炳雷; 刘文东
Original assignee: 三一重型装备有限公司
Priority date: 2012-07-02
Filing date: 2012-12-04
Publication date: 2014-01-09
Also published as: CN102748335B; CN102748335A

Abstract

A hydraulic system and excavator comprising same, the hydraulic system comprising a proportional directional valve assembly for controlling a first movement mechanism requiring speed regulation to work, and a switching directional valve assembly for controlling a second movement mechanism requiring no speed regulation to work; the movement mechanisms are divided into two types: one type is the first movement mechanism requiring working speed regulation, the first movement mechanism being controlled by the proportional directional valve assembly, and being regulated as required; and the other type is the second movement mechanism requiring no working speed regulation, the second movement mechanism being controlled by the switching directional valve assembly to achieve stable working. The present invention effectively solves the problems of low efficiency, complex circuitry and high component cost in existing hydraulic systems.

Description

The present invention claims the priority of the Chinese patent application filed on July 2, 2012 by the Chinese Patent Office, application number 201210225278.X, and the invention titled "a hydraulic system and a roadheader", all of which The content is incorporated herein by reference. TECHNICAL FIELD The present invention relates to the field of coal mine machinery technology, and more particularly to a hydraulic system and a roadhead machine equipped with the hydraulic system. BACKGROUND OF THE INVENTION At present, a hydraulic system is usually provided with a multi-way valve that controls the movement speed and movement direction of the actuator, but some actuators that do not require speed control also use the same control oil path, resulting in unnecessary waste, for example, a roadheader. The hydraulic control devices used are mostly load-sensing multi-way valves for controlling the direction and speed of movement of the actuator. The control mode is manual control or hydraulic pilot control. The load-sensing multi-way valve uses a split-type structure, and each multi-way valve provides one hydraulic oil. The flow rate of the hydraulic oil is determined by the opening area of the main spool and the main spool pressure difference determined by the pressure compensator.

The hydraulic system using the split-type load-sensing multi-way valve controls the blade cylinder, the rear support cylinder, and the like, which does not require speed regulation, resulting in disadvantages such as low efficiency of the hydraulic system, complicated circuit, and high component cost.

Therefore, how to improve the existing hydraulic system in order to solve the problems of low efficiency, complicated circuit and high component cost of the existing hydraulic system is a technical problem to be solved by those skilled in the art. SUMMARY OF THE INVENTION In view of the above, the present invention aims to provide a hydraulic system and a roadheader to solve the problems of low efficiency, complicated circuit, and high component cost of the existing hydraulic system. In one aspect, the present invention provides a hydraulic system including: a proportional reversing valve group for controlling operation of a first action mechanism requiring speed regulation; and a switch commutation for controlling operation of a second action mechanism that does not require speed regulation Valve group.

Further, the proportional reversing valve group includes: a first oil inlet oil passage; a first pilot pressure oil passage; a first oil return oil passage; a first load feedback oil passage; a first oil drain oil passage; An oil passage; and a throttle speed regulating assembly that communicates with the first oil inlet oil passage, the first pilot pressure oil passage, and the first oil drain oil passage; the throttle speed regulating assembly passes the first pilot pressure The oil passage performs throttle speed control on the first oil inlet passage; and the first return oil passage, the first drain oil passage, the first working oil passage, and the throttle governing assembly The first commutating component is connected; the first reversing component performs reversing adjustment on the oil passage outputted by the throttle governing component to implement control of the first working oil passage.

Further, the throttle speed adjustment component includes: a pressure compensator, the pressure compensator includes an oil inlet, an oil outlet, a first compensation oil passage, and a second compensation oil passage, and the pressure compensator advances The oil port is connected to the first oil inlet oil passage; the liquid control proportional flow valve, the liquid control proportional flow valve includes an oil inlet port, an oil outlet port, a control oil port and a drain port, and the pressure compensator a compensation oil passage and a second compensation oil passage are respectively connected to the oil inlet and the oil outlet of the liquid control proportional flow valve; the oil inlet of the liquid proportional proportional flow valve is connected to the oil outlet of the pressure compensator a drain port of the hydraulic proportional flow valve is connected to the first drain oil passage; an electromagnetic proportional pressure reducing valve for adjusting a flow rate of the pilot proportional flow valve; the electromagnetic proportional pressure reducing valve includes a fuel port, an oil outlet, and an electromagnetic control end, wherein an oil inlet of the electromagnetic proportional pressure reducing valve is in communication with the first pilot pressure oil passage, and an oil outlet of the electromagnetic proportional pressure reducing valve is proportional to the hydraulic control The control port of the flow valve is connected, and the electromagnetic ratio is reduced. Solenoid valve control of an external controller.

Further, the first reversing assembly comprises: a first hydraulic reversing unit communicating with the hydraulic proportional flow valve outlet; and a first electromagnetic reversing valve in communication with the first hydraulic reversing unit.

Further, the first hydraulic reversing unit comprises: a first logic valve, a first oil port is connected to the liquid control proportional flow valve oil outlet, a second oil port of the first logic valve is a second oil port of the first working oil passage is connected; a second logic valve having a first oil port communicating with the liquid control proportional flow valve oil outlet, and a second oil port of the second logic valve and the first a first oil port of a working oil passage is connected; a third logic valve having a first oil port communicating with the first oil return oil passage, a second oil port of the third logic valve and the first working oil The second port of the road is connected; the fourth logic valve, the first An oil port is connected to the first oil return oil passage, and a second oil port of the fourth logic valve is in communication with a first oil port of the first working oil circuit; wherein: the first electromagnetic reversing valve The oil inlet, the oil drain port, the first oil outlet port and the second oil outlet port; the oil inlet port of the first electromagnetic reversing valve is connected to the oil control proportional flow valve oil outlet, the first a drain port of the electromagnetic reversing valve is in communication with the first drain oil passage; a first oil outlet of the first electromagnetic reversing valve and a control port of the first logic valve and the fourth logic a control port of the valve is connected; a second oil outlet of the first electromagnetic reversing valve is in communication with a control port of the second logic valve and a control port of the third logic valve; The reversing valve includes three working states: in the first working state, the drain port of the first electromagnetic reversing valve passes through the first oil outlet and the second oil outlet of the first electromagnetic reversing valve a control port corresponding to the first logic valve, a control port of the second logic valve, a control port of the third logic valve, and the The control port of the four logic valve is connected; in the second working state, the oil inlet of the first electromagnetic reversing valve passes through the first oil outlet of the first electromagnetic reversing valve and the first logic a control port of the valve is in communication with a control port of the fourth logic valve; a drain port of the first electromagnetic reversing valve passes through a second oil outlet of the first electromagnetic reversing valve and the second a control port of the logic valve is connected to a control port of the third logic valve; in a third working state, an oil inlet of the first electromagnetic reversing valve passes through the first electromagnetic reversing valve The second oil outlet is in communication with the control port of the second logic valve and the control port of the third logic valve; the drain port of the first electromagnetic reversing valve passes through the first electromagnetic reversing valve The first oil outlet is in communication with a control port of the first logic valve and a control port of the fourth logic valve.

Further, the first hydraulic reversing unit comprises: a first hydraulic reversing valve, including an oil inlet, a return port, a first control port, a second control port, a first port, and a second outlet a fuel inlet; the oil inlet of the first hydraulic directional control valve is in communication with the oil control proportional flow valve outlet; the oil return port of the first hydraulic directional control valve is connected to the first return oil passage The first oil outlet port and the second oil outlet port of the first hydraulic directional control valve are respectively connected to the first oil port and the second oil port of the first working oil passage; the first hydraulic directional control valve Including the three working states: in the first working state, the first oil outlet and the second oil outlet of the first hydraulic directional control valve are in communication with the oil return port of the first hydraulic directional control valve; In the second working state, the first oil outlet of the first hydraulic directional control valve is in communication with the oil inlet of the first hydraulic directional control valve, and the second oil outlet of the first hydraulic directional control valve is The oil return port of the first hydraulic directional control valve is connected; in the third working state, the first hydraulic directional control valve The first oil outlet is connected to the oil return port of the first hydraulic directional control valve, and the second oil outlet of the first hydraulic directional control valve is connected to the oil inlet of the first hydraulic directional control valve; The first electromagnetic reversing valve includes an oil inlet port, a drain port, a first oil outlet port and a second oil outlet port; the oil inlet port of the first electromagnetic reversing valve is connected to the first pilot pressure oil passage Or communicating with the liquid control proportional flow valve outlet port, the drain port of the first electromagnetic reversing valve is in communication with the first drain oil passage; the first oil of the first electromagnetic reversing valve The port and the second oil outlet are respectively connected to the first control port and the second control port of the first hydraulic reversing valve; the first electromagnetic reversing valve comprises three working states: in the first type of work a first control of the first hydraulic outlet valve and the second oil outlet of the first electromagnetic reversing valve and the first hydraulic reversing valve The oil port is connected to the second control port; in the second working state, the oil inlet of the first electromagnetic reversing valve passes the first electromagnetic commutation a first oil outlet of the valve is in communication with a second control port of the first hydraulic directional control valve; a drain port of the first electromagnetic directional control valve passes through a second oil outlet of the first electromagnetic directional control valve a port is connected to the first control port of the first hydraulic directional control valve; in a third operating state, the oil inlet of the first electromagnetic directional control valve passes through the second of the first electromagnetic directional control valve The oil outlet is in communication with the first control port of the first hydraulic directional control valve; the drain port of the first electromagnetic directional control valve passes through the first oil outlet of the first electromagnetic directional control valve and the The second control port of the first hydraulic directional control valve is in communication.

Further, the first electromagnetic reversing valve is a three-position four-way solenoid valve; and/or the first hydraulic reversing valve is a three-position four-way hydraulic valve; and/or the first load feedback A first check valve is disposed on the oil passage, and an oil inlet of the first check valve is in communication with an oil outlet of the liquid control proportional flow valve.

Further, the switch reversing valve group includes: a second oil inlet oil passage; a second oil return oil passage; a second load feedback oil passage; a second oil drain oil passage; a second working oil passage; a speed regulating valve connected to the second oil inlet passage, wherein the speed regulating valve is configured to adjust a flow rate of the second oil inlet passage to stabilize the working speed of the second operating mechanism; and the second oil inlet passage, the first a second return oil passage, the second load feedback oil passage, the second drain oil passage and the second working oil passage are connected to the second reversing assembly, and the second reversing assembly outputs the speed regulating valve The oil circuit is reversing to achieve control of the second working oil circuit.

Further, the second load feedback oil path includes a first negative feedback oil pipe and a second negative feedback oil pipe; a second check valve is disposed on the first feedback oil pipe of the second load feedback oil passage, and an oil inlet of the second check valve is in communication with a first oil port of the second working oil passage;

A third check valve is disposed on the second feedback oil pipe of the second load feedback oil passage, and an oil inlet of the third check valve is in communication with a second oil port of the second working oil passage.

Further, the second reversing assembly comprises: a second hydraulic reversing unit in communication with the speed regulating valve; and an electromagnetic reversing valve unit in communication with the second hydraulic reversing unit.

Further, the electromagnetic reversing valve group includes a second electromagnetic reversing valve and a third electromagnetic reversing valve; the second hydraulic reversing unit comprises: a fifth logic valve, a first oil port thereof and the speed regulating a second oil port of the fifth logic valve is in communication with the second oil port of the second working oil circuit; a sixth logic valve, the first oil port and the speed control valve are The second port of the sixth logic valve is in communication with the first port of the second working oil passage; the seventh logic valve, the first oil port and the second oil return path Connected to; the second oil port of the seventh logic valve is in communication with the second oil port of the second working oil passage; the eighth logic valve, the first oil port is in communication with the second oil return oil passage; a second oil port of the eighth logic valve is in communication with the first oil port of the second working oil circuit; wherein the second electromagnetic switching valve includes an oil inlet port, a drain port, and a first oil outlet a port and a second oil outlet, wherein the oil inlet of the second electromagnetic reversing valve is in communication with the second oil inlet passage, and the second electromagnetic reversing valve is exhausted The port is connected to the second oil draining oil passage, the first oil outlet of the second electromagnetic reversing valve is in communication with the control oil port of the fifth logic valve; the second electromagnetic reversing valve is second The oil outlet is connected to the control port of the seventh logic valve; the second electromagnetic reversing valve comprises two working states: in the first working state, the oil inlet of the second electromagnetic reversing valve a first oil outlet of the second electromagnetic reversing valve is in communication with a control port of the fifth logic valve; a drain port of the second electromagnetic reversing valve passes through the second electromagnetic reversing valve The second oil outlet is connected to the control oil port of the seventh logic valve; in the second working state, the oil inlet of the second electromagnetic reversing valve passes the second of the second electromagnetic reversing valve The oil outlet is connected to the control port of the seventh logic valve; the drain port of the second electromagnetic reversing valve passes through the first oil outlet of the second electromagnetic reversing valve and the fifth logic valve The control port is connected; the third electromagnetic reversing valve includes an oil inlet, a drain port, a first oil outlet and a second oil outlet. An oil inlet of the third electromagnetic reversing valve is in communication with the second oil inlet passage, and a drain port of the third electromagnetic reversing valve is in communication with the second drain oil passage; a first oil outlet of the reversing valve and a control port of the sixth logic valve Connected; the second oil outlet of the third electromagnetic reversing valve is in communication with the control port of the eighth logic valve; the third electromagnetic reversing valve includes the first working with the second electromagnetic reversing valve The third electromagnetic reversing valve first working state and the second working state in which the state and the second working state work together, wherein the third electromagnetic reversing valve first working state comprises: the third electromagnetic reversing The oil inlet of the valve communicates with the control oil port of the sixth logic valve through the first oil outlet of the third electromagnetic reversing valve; the drain port of the third electromagnetic reversing valve passes the third The second oil outlet of the electromagnetic reversing valve is in communication with the control oil port of the eighth logic valve; the second working state of the third electromagnetic reversing valve includes: the oil inlet of the third electromagnetic reversing valve passes a second oil outlet of the third electromagnetic reversing valve is in communication with a control port of the eighth logic valve; a drain port of the third electromagnetic reversing valve passes through the third electromagnetic reversing valve An oil outlet is in communication with the control port of the sixth logic valve.

Further, the second electromagnetic reversing valve is a two-position four-way solenoid valve, and/or the third electromagnetic reversing valve is a two-position four-way solenoid valve.

Further, the switch reversing valve group further includes a second pilot pressure oil circuit; the electromagnetic reversing valve group includes a fourth electromagnetic reversing valve; and the second hydraulic reversing unit comprises: a second hydraulic reversing valve The oil inlet, the oil return port, the first control port, the second control port, the first oil outlet and the second oil outlet; the oil inlet of the second hydraulic directional control valve and the adjustment The oil outlet of the speed valve is connected; the oil return port of the second hydraulic directional control valve is in communication with the second oil return oil passage; the first oil outlet port and the second oil outlet port of the second hydraulic directional control valve Separating with the first port and the second port of the second working oil passage respectively; the second hydraulic reversing valve comprises three working states: in the first working state, the second hydraulic reversing valve The first oil outlet and the second oil outlet communicate with the oil return port of the second hydraulic directional control valve; in the second working state, the first oil outlet of the second hydraulic directional control valve The oil inlet of the second hydraulic directional control valve is in communication, the second oil outlet of the second hydraulic directional control valve and the second hydraulic directional control valve The oil port is connected; in the third working state, the first oil outlet of the second hydraulic directional control valve is in communication with the oil return port of the second hydraulic directional control valve, and the second hydraulic directional control valve is The second oil outlet port is connected to the oil inlet of the second hydraulic directional control valve; the fourth electromagnetic directional control valve includes an oil inlet port, a drain port, a first oil outlet port and a second oil outlet port; The oil inlet of the fourth electromagnetic reversing valve is connected to the second pilot pressure oil passage or communicates with the throttle valve oil outlet, the drain port of the fourth electromagnetic reversing valve and the second drain The first oil outlet and the second oil outlet of the fourth electromagnetic directional control valve are respectively connected with the first control port of the second hydraulic directional control valve and The second control port is connected; the fourth electromagnetic reversing valve includes three working states for controlling the second hydraulic reversing valve to perform different working states:

In the first working state, the drain port of the fourth electromagnetic reversing valve is respectively reversible with the second hydraulic pressure through the first oil outlet and the second oil outlet of the fourth electromagnetic reversing valve The first control port of the valve is in communication with the second control port;

In the second working state, the oil inlet of the fourth electromagnetic reversing valve passes through the first oil outlet of the fourth electromagnetic reversing valve and the second control port of the second hydraulic reversing valve Connected; the drain port of the fourth electromagnetic reversing valve communicates with the first control port of the second hydraulic reversing valve through the second oil outlet of the fourth electromagnetic reversing valve;

In a third working state, the oil inlet of the fourth electromagnetic reversing valve passes through the second oil outlet of the fourth electromagnetic reversing valve and the first control port of the second hydraulic reversing valve The drain port of the fourth electromagnetic reversing valve communicates with the second control port of the second hydraulic reversing valve through the first oil outlet of the fourth electromagnetic reversing valve.

Further, the fourth electromagnetic reversing valve is a three-position four-way solenoid valve; and/or

The second hydraulic reversing valve is a three-position four-way hydraulic valve.

According to another aspect of the present invention, the present invention provides a roadheader provided with the hydraulic system of any of the above.

Further, the first action mechanism comprises: a cutting head lifting, a rotary cylinder, and a walking motor; and the second action mechanism comprises: a blade and a rear support.

The invention provides a hydraulic system, comprising: a proportional reversing valve group for controlling operation of a first action mechanism requiring speed regulation; and a switch reversing valve group for controlling operation of a second action mechanism that does not require speed regulation. The action mechanism is divided into two categories, one is a first action mechanism that needs to adjust the working speed, the first action mechanism is controlled by the proportional reversing valve group, the first action mechanism can be adjusted as needed, and the other type is that the working speed is not required to be adjusted. The second action mechanism and the second action mechanism are controlled by the switch reversing valve group to realize the smooth operation of the second action mechanism. The invention can effectively solve the problems of low complex efficiency, complicated circuit and high component cost of the existing hydraulic system. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic diagram of a hydraulic principle of a first embodiment of a proportional reversing valve group according to an embodiment of the present invention; FIG. 2 is a schematic diagram of a hydraulic principle of a second embodiment of a proportional reversing valve group according to an embodiment of the present invention; Schematic diagram of the hydraulic principle of the medium switch type reversing valve group scheme 1; FIG. 4 is a schematic diagram of the hydraulic principle of the second embodiment of the switch reversing valve group according to the embodiment of the present invention. DESCRIPTION OF REFERENCE NUMERALS: 1. First check valve; 11, second check valve; 12, third check valve;

21, a first logic valve; 22, a second logic valve; 23, a third logic valve; 24, a fourth logic valve;

25, the fifth logic valve; 26, the sixth logic valve; 27, the seventh logic valve; 28, the eighth logic valve;

3, electromagnetic proportional pressure reducing valve; 4, pressure compensator; 5, hydraulic control proportional flow valve; 6, the first electromagnetic reversing valve; 61, the fourth electromagnetic reversing valve; 7, the second electromagnetic reversing valve; , the third electromagnetic reversing valve; 8, speed governing valve; 9, the first hydraulic reversing valve; 91, the second hydraulic reversing valve. DETAILED DESCRIPTION OF THE EMBODIMENTS In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the description of the specific structures in this section and the description of the embodiments are merely illustrative of specific embodiments and should not be construed as limiting the scope of the invention.

Since the present invention is a combination of a proportional reversing valve group and a switching reversing valve group, the proportional reversing valve group and the switching reversing valve group provided by the embodiments of the present invention have two schemes; Embodiments of the invention are mainly described below with respect to various aspects of the proportional reversing valve group and the switching reversing valve group.

The embodiment of the invention provides a hydraulic system, comprising: a proportional reversing valve group for controlling the operation of a first action mechanism that requires speed regulation; and a switch reversing valve group for controlling a second action mechanism that does not require speed regulation . The action mechanism is divided into two categories, one is a first action mechanism that needs to adjust the working speed, and the first action mechanism is controlled by a proportional reversing valve group, which can be adjusted by adjusting a throttle governing element of the proportional reversing valve block. The working speed of the action mechanism. The other type is a second action mechanism that does not require adjustment of the working speed, and the second action mechanism passes through the switch reversing valve block. The control can basically realize the smooth operation according to the predetermined speed, and the required component cost is low, and the service life is long; the whole action mechanism is separately controlled, the hydraulic system is high in efficiency, the circuit is single, and the component cost is low. It can be combined according to the existing proportional reversing valve combination switch reversing valve group, and the first action mechanism and the second action mechanism are separately hydraulically controlled.

Among them, as shown in Figure 1, the figure is a schematic diagram of the principle of the proportional reversing valve group, one of the two parallel proportional reversing valve groups shown in the figure, the solid line is the transmission hydraulic oil line, the dotted line is the control hydraulic oil The circuit, wherein each proportional reversing valve group comprises: a first oil inlet oil passage, the first oil inlet oil passage is connected with the oil inlet port P; a first pilot pressure oil passage, a first pilot pressure oil passage and a pilot pressure oil port P1 is connected; the first return oil passage, the first return oil passage is connected with the oil return port T; the first load feedback oil passage, the first feedback oil passage is connected with the feedback oil port Ls; the first drain oil passage, the first a drain port is connected to the drain port T1; the first working oil passage, the first working oil passage is connected to the working ports A1 and B1; and the first inlet oil passage, the first pilot pressure oil passage and the first a throttle speed regulating component connected to the oil draining oil passage; the throttle speed regulating component performs throttle speed control on the first oil inlet oil passage through the first pilot pressure oil passage; and the first return oil passage, the first drain First commutation of oil oil passage, first working oil passage and throttling speed regulating component Pieces. The first reversing component performs the reversing adjustment of the oil passage outputted by the throttle speed regulating component to realize the control of the first working oil passage.

The throttling speed regulating component can be a speed regulating component commonly used in the field, and the first reversing component can be a commutating component commonly used in the field; wherein, in the oil returning of the hydraulic system, more impurities are contained in the oil returning oil. The throttling speed control component is arranged in the road, and the valve core is prone to faults, etc., and the system has poor anti-pollution capability. The throttle system of the hydraulic system of the present invention is provided with a throttle speed regulation group, and no throttle control is provided at the oil outlet. The components improve the anti-pollution ability of the hydraulic system. The speed control element of the hydraulic system and the reversing element are separated, which improves the stability of the system.

As shown in Figure 1, the throttle governor assembly includes: a pressure compensator 4, a pilot proportional flow valve 5, and an electromagnetic proportional pressure reducing valve 3.

The pressure compensator 4 includes an oil inlet, an oil outlet, a first compensation oil passage, and a second compensation oil passage, and the oil inlet of the pressure compensator is in communication with the first oil inlet passage.

The hydraulic proportional flow valve 5 includes an oil inlet port, an oil outlet port, a control oil port and a drain port, and the first compensation oil passage and the second compensation oil passage of the pressure compensator 4 are respectively connected to the liquid control proportional flow rate The oil inlet and the oil outlet of the valve 5; the oil inlet of the hydraulic proportional flow valve 5 and the pressure The oil compensator outlet is connected; the drain port of the hydraulic proportional flow valve 5 is in communication with the first drain oil passage;

The electromagnetic proportional pressure reducing valve 3 is used for adjusting the flow rate of the liquid control proportional flow valve 5, and the electromagnetic proportional pressure reducing valve 3 includes an oil inlet port, an oil outlet port and an electromagnetic control end, and the oil inlet port of the electromagnetic proportional pressure reducing valve 3 and the first pilot The pressure oil passage is connected, the oil outlet of the electromagnetic proportional pressure reducing valve 3 is connected with the control oil port of the liquid control proportional flow valve, and the electromagnetic control end of the electromagnetic proportional pressure reducing valve 3 is externally connected to the controller (not shown); The pressure reducing valve precisely adjusts the flow rate of the pilot proportional flow valve.

Additionally, the first reversing assembly includes: a first hydraulic reversing unit in communication with the pilot proportional flow valve 5; and a first electromagnetic reversing valve 6 in communication with the first hydraulic reversing unit.

As shown in FIG. 1, the first hydraulic reversing unit comprises: a first logic valve 21, the first port of which is in communication with the oil outlet of the pilot proportional flow valve 5, and the second port of the first logic valve 21 is a second oil port of the first working oil passage is connected; a second logic valve 22, a first oil port thereof communicates with an oil outlet of the liquid control proportional flow valve 5, and a second oil of the second logic valve 22 The port is connected to the first oil port of the first working oil passage; the third logic valve 23 has a first oil port communicating with the first oil return oil passage, and the second oil port of the third logic valve 23 And communicating with the second oil port of the first working oil passage; the fourth logic valve 24, the first oil port is connected to the first oil return oil passage, and the second oil port of the fourth logic valve 24 is The first oil port of the first working oil passage is connected;

The first electromagnetic reversing valve 6 includes an oil inlet port, a drain port, a first oil outlet port and a second oil outlet port; the oil inlet port of the first electromagnetic reversing valve 6 and the hydraulic control proportional flow valve 5 are discharged. The port is connected, the drain port of the first electromagnetic reversing valve 6 is in communication with the first drain oil passage; the first oil outlet of the first electromagnetic reversing valve 6 and the control port of the first logic valve 21 Communicating with a control port of the fourth logic valve 24; a second oil outlet of the first electromagnetic switching valve 6 and a control port of the second logic valve 22 and the third logic valve 23 The control port is connected; the first electromagnetic reversing valve 6 includes three working states:

In the first working state, the drain port of the first electromagnetic reversing valve 6 passes through the first oil outlet port and the second oil outlet port of the first electromagnetic reversing valve 6 and is respectively controlled by the first logic valve 21 The oil port, the control port of the second logic valve 22, the control port of the third logic valve 23, and the control port of the fourth logic valve 24 are in communication. In the second working state, the oil inlet of the first electromagnetic reversing valve 6 passes through the first oil outlet of the first electromagnetic reversing valve 6 and the control port of the first logic valve 21 and the fourth logic valve 24 The control port is connected; the drain port of the first electromagnetic reversing valve 6 passes through the second oil outlet of the first electromagnetic reversing valve 6 and the control port of the second logic valve 22 and the control port of the third logic valve 23 Connected.

In the third working state, the oil inlet of the first electromagnetic reversing valve 6 passes through the second oil outlet of the first electromagnetic reversing valve 6 and the control port of the second logic valve 22 and the third logic valve 23 The control port is connected; the drain port of the first electromagnetic reversing valve 6 passes through the first oil outlet of the first electromagnetic reversing valve 6 and the control port of the first logic valve 21 and the control port of the fourth logic valve 24 Connected.

The first electromagnetic reversing valve 6 in FIG. 1 is a three-position four-way solenoid valve; when the first electromagnetic reversing valve 6 is in the middle position, it is the first working state, the Al, B1 hydraulic circuit is closed; the first electromagnetic reversing valve 6 is in When the left position is the second working state, the A1 port is the oil inlet of the actuator, the B1 port is the oil return port of the actuator; the first electromagnetic reversing valve 6 is in the third position, and the B1 port is executed. The inlet of the mechanism, port A1 is the return port of the actuator.

In addition, FIG. 2 is a schematic diagram of the principle of the proportional reversing valve group scheme 2. In the figure, the structure of the throttle speed regulating component is the same as that of the first embodiment, and the first reversing component comprises: communicating with the liquid control proportional flow valve 5 a first hydraulic reversing unit; a first electromagnetic reversing valve 6 in communication with the hydraulic reversing unit.

The first hydraulic reversing unit includes: a first hydraulic reversing valve 9 including an oil inlet, a return port, a first control port, a second control port, a first port, and a second port; The oil inlet of the first hydraulic directional control valve 9 is in communication with the oil outlet of the hydraulic proportional flow valve 5; the oil return port of the first hydraulic directional control valve 9 is in communication with the first return oil passage; the first hydraulic reversing The first oil outlet and the second oil outlet of the valve 9 are respectively communicated with the first oil port and the second oil port of the first working oil passage; the first hydraulic pressure changing valve 9 includes three working states:

In the first operating state, the first oil outlet and the second oil outlet of the first hydraulic directional control valve 9 communicate with the oil return port of the first hydraulic directional control valve 9.

In the second working state, in the third working state, the first oil outlet of the first hydraulic directional control valve 9 communicates with the oil inlet of the first hydraulic directional control valve 9, and the first hydraulic directional control valve 9 The two oil outlets are in communication with the oil return port of the first hydraulic directional control valve 9. In the third working state, the first oil outlet of the first hydraulic directional control valve 9 is in communication with the oil return port of the first hydraulic directional control valve 9, and the second oil outlet of the first hydraulic directional control valve 9 is first The oil inlet of the hydraulic directional control valve 9 is connected.

The first electromagnetic reversing valve 6 includes an oil inlet port, a drain port, a first oil outlet port and a second oil outlet port; the oil inlet port of the first electromagnetic reversing valve 6 is in communication with the first pilot pressure oil passage. a drain port of the first electromagnetic reversing valve 6 is in communication with the first drain oil passage; a first oil outlet and a second oil outlet of the first electromagnetic reversing valve 6 are respectively connected to the first hydraulic pressure The first control port of the reversing valve 9 is in communication with the second control port; the first electromagnetic reversing valve 6 includes three operating states for controlling the first hydraulic reversing valve 9 to perform different operating states:

In the first working state, the drain port of the first electromagnetic reversing valve 6 passes through the first oil outlet and the second oil outlet of the first electromagnetic reversing valve 6, respectively, and the first hydraulic pressure The first control port of the reversing valve 9 is in communication with the second control port.

In the second working state, the oil inlet of the first electromagnetic reversing valve 6 is connected to the second control port of the first hydraulic reversing valve 9 through the first oil outlet of the first electromagnetic reversing valve 6; The drain port of the electromagnetic reversing valve 6 communicates with the first control port of the first hydraulic reversing valve 9 through the second oil outlet of the first electromagnetic reversing valve 6.

In the third working state, the oil inlet of the first electromagnetic reversing valve 6 passes through the second oil outlet of the first electromagnetic reversing valve 6 and the first of the first hydraulic reversing valve 9 The oil port of the first electromagnetic directional control valve 6 communicates with the second control oil port of the first hydraulic directional control valve 9 through the first oil outlet of the first electromagnetic directional control valve 6 .

The first electromagnetic reversing valve 6 controls the first hydraulic reversing valve 9 to enter different working states by controlling the first control port and the second control port of the first hydraulic reversing valve 9, as shown in FIG. 2, first The electromagnetic reversing valve 6 is a three-position four-way solenoid valve; the first hydraulic reversing valve 9 is a three-position four-way hydraulic valve; in the first working state of the first electromagnetic reversing valve 6 (in the middle position), The first hydraulic reversing valve 9 enters the first working state (at the neutral position), the Al, B1 hydraulic circuit is closed; in the second working state of the first electromagnetic reversing valve 6 (in the upper position), the first hydraulic reversing Valve 9 enters the second working state (in the right position), port A1 is the oil inlet of the actuator, and port B1 is the oil return port of the actuator; in the first working state of the first electromagnetic reversing valve 6 (In the lower position), the first hydraulic directional control valve 9 enters the third working state (in the left position), the B1 port is the oil inlet of the actuator, and the A1 port is the oil return port of the actuator.

Wherein, the oil inlet of the first electromagnetic reversing valve 6 can also communicate with the first oil inlet oil passage instead of communicating with the first pilot pressure oil passage to realize the control of the first hydraulic reversing valve 9. Because the first electromagnetic reversing valve 6 in the second embodiment controls the first hydraulic reversing valve 9 through the external oil passage, the required oil pressure is small, so the oil inlet of the first electromagnetic reversing valve 6 can communicate with the first oil inlet passage. It is also possible to connect the first pilot pressure oil passage.

As shown in FIG. 3, FIG. 3 is a schematic structural diagram of a switch-operated valve group scheme 1. The diagram includes two switch-operated valve groups, wherein one switch-commutated valve group includes: a second oil-intake circuit, The second oil passage is connected to the oil inlet port; the second oil return passage, the second return oil passage is connected to the oil return port; the second load feedback oil passage, the second load feedback oil passage is connected to the feedback oil port Ls; The second oil draining oil passage, the second oil draining oil passage is connected to the oil draining port T1; the second working oil pipeline, the second working oil pipeline connecting the working oil ports A3 and B3, and the speed regulating circuit connected with the second oil inlet oil passage The valve 8 is configured to adjust the flow rate of the second oil inlet passage to stabilize the working speed of the second action mechanism; and the second oil return oil passage, the second return oil passage, and the second load feedback oil passage a second reversing component that communicates with the second oil draining oil passage and the second working oil passage, and the second reversing component performs reversing adjustment of the oil passage outputted by the speed regulating valve 8 to realize the second working oil passage control.

Wherein, as shown in FIG. 3, the second load feedback oil path includes a first negative feedback oil pipe and a second negative feedback oil pipe; the first feedback oil pipe of the second load feedback oil circuit is provided with a second one-way valve 11 , and second The oil inlet of the one-way valve 11 is in communication with the first oil port of the second working oil circuit; the second feedback oil pipe of the second load feedback oil circuit is provided with a third one-way valve 12, and the third one-way valve 12 is advanced. The oil port is in communication with the second oil passage of the second working oil passage. The pressure signal is fed back through the feedback oil path.

Wherein, as shown in FIG. 3, the second reversing assembly comprises: a second hydraulic reversing unit in communication with the speed regulating valve 8; and an electromagnetic reversing valve unit in communication with the second hydraulic reversing unit.

The electromagnetic reversing valve group includes a second electromagnetic reversing valve 7 and a third electromagnetic reversing valve 71; the second hydraulic reversing unit comprises: a fifth logic valve 25, the first oil port and the speed regulating valve 8 are oiled The second port of the fifth logic valve 25 is in communication with the second port of the second working oil passage; the sixth logic valve 26 has a first port and the speed regulating valve 8 a second port of the sixth logic valve 26 is connected to the first port of the second working oil passage; the seventh logic a valve 27, the first oil port is in communication with the second oil return passage; the second oil port of the seventh logic valve 27 is in communication with the second oil port of the second working oil passage; The valve 28 has a first oil port communicating with the second oil return passage; a second oil port of the eighth logic valve 28 is in communication with the first oil port of the second working oil passage. among them:

The second electromagnetic reversing valve 7 includes an oil inlet port, a drain port, a first oil outlet port and a second oil outlet port, and the oil inlet port of the second electromagnetic reversing valve 7 is in communication with the second oil inlet oil passage. The drain port of the second electromagnetic reversing valve 7 is in communication with the second drain oil passage; the first oil outlet of the second electromagnetic reversing valve 7 and the control oil of the fifth logic valve 25 The second oil outlet of the second electromagnetic reversing valve 7 is in communication with the control port of the seventh logic valve 27; the second electromagnetic reversing valve 7 includes two working states:

In the first working state, the oil inlet of the second electromagnetic reversing valve 7 communicates with the control port of the fifth logic valve 25 through the first oil outlet of the second electromagnetic reversing valve 7; the second electromagnetic reversing The drain port of the valve 7 communicates with the control port of the seventh logic valve 27 through the second oil outlet of the second electromagnetic reversing valve 7. In the second working state, the oil inlet of the second electromagnetic reversing valve 7 communicates with the control oil port of the seventh logic valve 27 through the second oil outlet of the second electromagnetic reversing valve 7; the second electromagnetic reversing The drain port of the valve 7 communicates with the control port of the fifth logic valve 25 through the first oil outlet of the second electromagnetic reversing valve 7.

The third electromagnetic reversing valve 71 includes an oil inlet port, a drain port, a first oil outlet port and a second oil outlet port, and the oil inlet port of the third electromagnetic reversing valve 71 communicates with the second oil inlet oil passage, and the third The drain port of the electromagnetic reversing valve 71 is in communication with the second drain oil passage; the first oil outlet of the third electromagnetic reversing valve 71 is in communication with the control port of the sixth logic valve 26; The second oil outlet of the electromagnetic reversing valve 71 is in communication with the control port of the eighth logic valve 28; the third electromagnetic reversing valve 71 includes the first working state and the second working with the second electromagnetic reversing valve 7 a third electromagnetic reversing valve 71 in a state in which the state cooperates, a first working state and a second working state, wherein

The first working state of the third electromagnetic reversing valve 71 includes: the oil inlet of the third electromagnetic reversing valve 71 communicates with the control oil port of the sixth logic valve 26 through the first oil outlet of the third electromagnetic reversing valve 71; The drain port of the third electromagnetic reversing valve 71 communicates with the control port of the eighth logic valve 28 through the second oil outlet of the third electromagnetic reversing valve 71. The second working state of the third electromagnetic reversing valve 71 includes: the oil inlet of the third electromagnetic reversing valve 71 communicates with the control oil port of the eighth logic valve 28 through the second oil outlet of the third electromagnetic reversing valve 71; The drain port of the third electromagnetic reversing valve 71 communicates with the control port of the sixth logic valve 26 through the first oil outlet of the third electromagnetic reversing valve 71.

As shown in FIG. 3, the electromagnetic reversing valve group includes a second electromagnetic reversing valve 7 and a third electromagnetic reversing valve 71; the second electromagnetic reversing valve 7 is a two-position four-way solenoid valve, and the third electromagnetic reversing valve 71 It is also a two-position four-way solenoid valve; through the cooperation of the second electromagnetic reversing valve 7 and the third electromagnetic reversing valve 71 in different working states, the electromagnetic reversing valve group is maintained in three different working states, wherein, the electromagnetic exchange The first working state of the valve group is that the first working state of the second electromagnetic reversing valve 7 cooperates with the first working state of the third electromagnetic reversing valve 71, at which time the hydraulic circuit of A3, B3 is closed; The second working state of the valve group is that the second working state of the second electromagnetic reversing valve 7 cooperates with the first working state of the third electromagnetic reversing valve 71, and the port B3 is the oil inlet of the actuator. The port A3 is the oil return port of the actuator; the third working state of the electromagnetic reversing valve group is the cooperation between the first working state of the second electromagnetic reversing valve 7 and the first working state of the third electromagnetic reversing valve 71 Work, port A3 is the inlet of the actuator, port B3 Return port actuator.

As shown in FIG. 4, the figure is a schematic diagram of the principle of the switch-operating valve group scheme 2. In the figure, the structure of the speed-regulating valve 8 of the switch-oriented valve group is unchanged, and the second commutation component includes: communicating with the speed-regulating valve 8 a second hydraulic reversing unit; an electromagnetic reversing valve group in communication with the second hydraulic reversing unit.

The switch-operated valve group further includes a second pilot pressure oil circuit; the electromagnetic reversing valve group includes a fourth electromagnetic reversing valve 61; and the second hydraulic reversing unit includes: a second hydraulic reversing valve 91, including an oil inlet port , the oil return port, the first control port, the second control port, the first oil outlet and the second oil outlet; the oil inlet of the second hydraulic reversing valve 91 and the oil outlet of the speed regulating valve 8 The oil return port of the second hydraulic directional control valve 91 is in communication with the second oil return oil passage; the first oil outlet port and the second oil outlet port of the second hydraulic directional control valve 91 are respectively The first port of the working oil passage is connected to the second port; the second hydraulic reversing valve 91 includes three working states:

In the first operating state, the first oil outlet and the second oil outlet of the second hydraulic directional control valve 91 communicate with the oil return port of the second hydraulic directional control valve 91. In the second working state, the first oil outlet of the second hydraulic directional control valve 91 communicates with the oil inlet of the second hydraulic directional control valve 91, and the second oil outlet of the second hydraulic directional control valve 91 The oil return port of the second hydraulic directional control valve 91 is in communication.

In the third working state, the first oil outlet of the second hydraulic directional control valve 91 communicates with the oil return port of the second hydraulic directional control valve 91, and the second oil discharge of the second hydraulic directional control valve 91 The port is in communication with the oil inlet of the second hydraulic directional control valve 91.

The fourth electromagnetic reversing valve 61 includes an oil inlet port, a drain port, a first oil outlet port and a second oil outlet port; the oil inlet port of the fourth electromagnetic reversing valve 61 is in communication with the second pilot pressure oil passage, and the fourth a drain port of the electromagnetic reversing valve 61 is in communication with the second drain oil passage; the first oil outlet port and the second oil outlet port of the fourth electromagnetic reversing valve 61 are respectively reversing with the second hydraulic pressure The first control port of the valve 91 is in communication with the second control port; the fourth electromagnetic reversing valve 61 includes three operating states for controlling the second hydraulic reversing valve 91 to perform different operating states:

In the first working state, the drain port of the fourth electromagnetic reversing valve 61 passes through the first oil outlet port and the second oil outlet port of the fourth electromagnetic reversing valve 61 and the second hydraulic reversing valve 91, respectively. a control port is connected to the second control port;

In the second working state, the oil inlet of the fourth electromagnetic reversing valve 61 passes through the first oil outlet of the fourth electromagnetic reversing valve 61 and the second control oil of the second hydraulic reversing valve 91 The port of the fourth electromagnetic reversing valve 61 is connected to the first control port of the second hydraulic reversing valve 91 through the second oil outlet of the fourth electromagnetic reversing valve 61;

In the third working state, the oil inlet of the fourth electromagnetic reversing valve 61 passes through the second oil outlet of the fourth electromagnetic reversing valve 61 and the first control oil of the second hydraulic reversing valve 91 The port of the fourth electromagnetic reversing valve 61 communicates with the second control port of the second hydraulic reversing valve 91 through the first oil outlet of the fourth electromagnetic reversing valve 61.

The fourth electromagnetic reversing valve 61 controls the second hydraulic reversing valve 91 to enter different working states by controlling the first control port and the second control port of the second hydraulic reversing valve 91, as shown in FIG. The electromagnetic reversing valve 61 is a three-position four-way solenoid valve; the second hydraulic reversing valve 91 is a three-position four-way hydraulic valve; in the first working state of the fourth electromagnetic reversing valve 61 (in the middle position) ( The orientation is based on the direction shown in the figure), the second hydraulic reversing valve 91 enters the first working state (at the neutral position), the hydraulic circuit of A3, B3 is closed, and the second working state of the fourth electromagnetic reversing valve 61 In the case (in the upper position), the second hydraulic directional control valve 91 enters the second working state (in the right position), the port A3 is the oil inlet of the actuator, and the port B3 is the oil return port of the actuator; In the first working state of the valve 61 (in the lower position), the second hydraulic reversing valve 91 enters the third working state (in the left position), the port B3 is the oil inlet of the actuator, and the port A3 is the actuator. Oil port.

The fourth electromagnetic reversing valve 61 may also be connected to the second intake oil passage instead of the fourth pilot pressure oil passage to control the second hydraulic reversing valve 91. Because the fourth electromagnetic reversing valve 61 in the second embodiment controls the second hydraulic reversing valve 91 through the external oil passage, the required oil pressure is small, so the fourth electromagnetic reversing valve 61 can communicate with the second intake oil. The road can also be connected to the second pilot pressure oil circuit.

In the first embodiment of the present invention, a proportional reversing valve group (scheme 1) and a switch reversing valve group (scheme 1) are combined, and the proportional reversing valve group (scheme 1) and the switch reversing valve in the specific composition are The structure of the group (Scheme 1) has been described in the above embodiment, and will not be described herein.

The second embodiment of the present invention combines a proportional reversing valve group (scheme 1) with a switch reversing valve group (scheme 2), and the proportional reversing valve group (scheme 1) and the switch reversing valve in the specific composition The structure of the group (Scheme 2) has been described in the above embodiments, and details are not described herein again.

The third embodiment of the present invention combines a proportional reversing valve group (scheme 2) with a switch reversing valve group (scheme 1), and the proportional reversing valve group (scheme 2) and the switch reversing valve in the specific composition The structure of the group (Scheme 1) has been described in the above embodiment, and will not be described herein.

The fourth embodiment of the present invention combines a proportional reversing valve group (scheme 2) with a switch reversing valve group (scheme 2), and the proportional reversing valve group (scheme 2) and the switch reversing valve in the specific composition structure The structure of the group (Scheme 2) has been described in the above embodiments, and details are not described herein again.

The specific principle is as follows:

The main hydraulic control part of the hydraulic system uses a centralized valve block. The number of hydraulic circuits of the concentrated valve block is determined according to the number of corresponding actuators. The principle of the proportional reversing valve group scheme 1 with two hydraulic circuits is shown in Fig. 1. Each proportional reversing valve group includes a first one-way valve 1, a logic valve 2, an electromagnetic proportional pressure reducing valve 3, and a pressure compensator. 4. The hydraulic control proportional flow valve 5, the first electromagnetic reversing valve 6, the external port load feedback port LS, the pilot pressure port Pl, the main inlet port P, the main return port T, the drain port Tl, Working port Al, Bi o The working principle of the first example of the reversing valve group is as follows:

As shown in Fig. 1, the solid line in the figure is the transmission hydraulic oil line, and the broken line is the control hydraulic oil line. The high-pressure oil outputted by the hydraulic pump passes through the filter and reaches the oil inlet P of the proportional reversing valve group. The hydraulic oil flows to The proportional compensating valve group has a pressure compensator 4 inlet port of each circuit, and the pressure compensator 4 determines the pressure drop of the inlet and outlet ports of the hydraulic proportional flow valve 5, thereby flowing through the hydraulically controlled proportional flow valve 5 The flow rate is only related to the output pressure of the electromagnetic proportional pressure reducing valve 3, and the output pressure of the electromagnetic proportional pressure reducing valve 3 is determined by the input current, so that the hydraulic system has a good proportional control characteristic.

Four logic valves (first logic valve 21, second logic valve 22, third logic valve 23 and fourth logic valve 24) and a first electromagnetic reversing valve 6 constitute a switch type hydraulic reversing valve, hydraulically controlled proportional flow The hydraulic oil outputted by the valve 5 passes through the logic valve, and the first electromagnetic reversing valve 6 controls the on and off of the four logic valves. When the first electromagnetic reversing valve 6 is in the neutral position (the orientation is in the direction shown in the figure), all four logic valves are closed and the hydraulic circuit is closed. When the first electromagnetic reversing valve 6 is in the left position, the second logic valve 22 and the third logic valve 23 are turned on, the A1 port is the oil inlet of the actuator, and the B1 port is the oil return port of the actuator. When the first electromagnetic reversing valve 6 is in the right position, the first logic valve 21 and the fourth logic valve 24 are turned on, the port B1 is the oil inlet of the actuator, and the port A1 is the oil return port of the actuator.

The first check valve 1 inlet port is connected to the oil outlet of the hydraulic proportional flow valve 5, and is used to obtain the highest working pressure of the hydraulic circuit of different actuators as the LS feedback pressure signal.

The principle of the switch reversing valve group with two circuits is as shown in Fig. 2. Each switch reversing valve group includes a second check valve 11 and a third check valve 12; four logic valves (fifth logic The valve 25, the sixth logic valve 26, the seventh logic valve 27 and the eighth logic valve 28), the second electromagnetic reversing valve 7, the third electromagnetic reversing valve 71, and the speed regulating valve 8. The external port includes the load feedback port LS, the inlet port P, the return port T, the drain port Tl, the working port A3, Β3 ο

The working principle of the switch one of the switch reversing valve group is as follows:

As shown in Fig. 3, the solid line in the figure is the transmission hydraulic oil line, and the broken line is the control hydraulic oil line. The high-pressure oil outputted by the hydraulic pump passes through the filter and reaches the oil inlet port of the switch-operated valve group. The hydraulic oil flows to The speed regulating valve 8 of the switch reversing valve group, the flow rate of each hydraulic circuit is adjusted by the speed regulating valve 8, thereby determining the moving speed of the corresponding actuator. The commutation of the hydraulic circuit consists of four logic valves (fifth logic valve 25, sixth logic valve 26, seventh logic valve 27 and eighth logic valve 28) and two electromagnetic reversing valves (second electromagnetic reversing valve 7) The third electromagnetic reversing valve 71 is completed. When the two electromagnetic reversing valves are not energized at the same time, the hydraulic circuit is closed. When the second electromagnetic reversing valve 7 is energized and the third electromagnetic reversing valve 71 is not energized, the fifth logic valve 25 and the eighth logic valve 28 are turned on, the port B3 is the oil inlet of the actuator, and the port A3 is the actuator. The return port. When the third electromagnetic reversing valve 71 is energized and the second electromagnetic reversing valve 7 is not energized, the sixth logic valve 26 and the seventh logic valve 27 are turned on, the port A3 is the oil inlet of the actuator, and the port B3 is the actuator. The return port.

The first check valve 1 and the second check valve 11 are respectively connected to the working ports A3 and B3 of the actuator, and are used to obtain the highest working pressure of the hydraulic circuit of different actuators as the LS feedback pressure signal.

As shown in Fig. 2, the proportional reversing valve group replaces the four logic valves with the first hydraulic reversing valve 9 in the second embodiment, and the reversing function of the hydraulic circuit can also be realized. The specific principle is:

As shown in Fig. 2, the solid line in the figure is the transmission hydraulic oil line, and the broken line is the control hydraulic oil line. The high pressure oil outputted by the hydraulic pump passes through the filter and reaches the first oil inlet P of the proportional reversing valve group, hydraulic oil. Flow to the pressure compensator 4 inlet of each circuit of the proportional reversing valve group, the pressure compensator 4 determines the pressure drop of the inlet and outlet of the pilot proportional flow valve 5, thereby allowing the flow through the hydraulic control The flow rate of the valve 5 is only related to the output pressure of the electromagnetic proportional pressure reducing valve 3, and the output pressure of the electromagnetic proportional pressure reducing valve 3 is determined by the input current, so that the hydraulic system has a good proportional control characteristic.

The commutation of the hydraulic circuit is realized by the first electromagnetic reversing valve 6 controlling the first hydraulic reversing valve 9, when the first electromagnetic reversing valve 6 is in the neutral position (the orientation is in the direction shown in the figure), the first hydraulic pressure The reversing valve 9 is in the neutral position and the hydraulic circuit is closed. When the first electromagnetic reversing valve 6 is in the upper position, the first hydraulic reversing valve 9 is in the right position, the A1 port is the oil inlet of the actuator, and the port B1 is the oil return port of the actuator. When the first electromagnetic reversing valve 6 is in the lower position, the first hydraulic reversing valve 9 is in the left position, the B1 port is the oil inlet of the actuator, and the A1 port is the oil return port of the actuator.

As shown in FIG. 4, in the switch-operating valve group scheme 2, the second hydraulic reversing valve 91 is used instead of the four logic valves, and the commutation function of the hydraulic circuit can also be realized. The specific principle is: As shown in Fig. 4, the solid line in the figure is the transmission hydraulic oil line, and the broken line is the control hydraulic oil line. The high-pressure oil outputted by the hydraulic pump passes through the filter and reaches the oil inlet P of the switch-operated valve group. The hydraulic oil flows to The speed regulating valve 8 of the switch reversing valve group, the flow rate of each hydraulic circuit is adjusted by the speed regulating valve 8, thereby determining the moving speed of the corresponding actuator.

The commutation of the hydraulic circuit is realized by the second electromagnetic reversing valve 7 controlling the second hydraulic reversing valve 91, when the second electromagnetic reversing valve 7 is in the neutral position (the orientation is in the direction shown in the figure), the second hydraulic pressure The reversing valve 91 is in the neutral position and the hydraulic circuit is closed. When the second electromagnetic reversing valve 7 is in the upper position, the second hydraulic reversing valve 91 is in the right position, the port A3 is the oil inlet of the actuator, and the port B3 is the oil return port of the actuator. When the second electromagnetic reversing valve 7 is in the lower position, the second hydraulic reversing valve 91 is in the left position, the port B3 is the oil inlet of the actuator, and the port A3 is the oil return port of the actuator.

The embodiment of the invention also provides a roadheading machine, which is provided with the above hydraulic system. Since the above hydraulic system has the above technical effects, the roadheader provided with the hydraulic system should also have corresponding technical effects, and the structure of other components is similar to that of the above embodiment; the specific implementation process is similar to the above embodiment, and no further description is provided. . The first action mechanism in the roadheader includes: a cutting head lifting, a rotary cylinder, and a traveling motor; and the second action mechanism includes: a blade and a rear support frame.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalents, improvements, etc., which are included in the spirit and scope of the present invention, should be included in the present invention. Within the scope of protection.

Industrial Applicability The hydraulic system and the roadheader provided by the present invention can improve the complex efficiency of the existing hydraulic system, reduce the circuit complexity of the hydraulic system, and reduce the cost of components. Therefore, the present invention has industrial applicability.

Claims

Claim

A hydraulic system, comprising:

a proportional reversing valve group for controlling the operation of the first action mechanism requiring speed regulation;

A switch reversing valve group for controlling the operation of a second action mechanism that does not require speed regulation.

2. The hydraulic system according to claim 1, wherein the proportional reversing valve group comprises:

First oil inlet road;

First pilot pressure oil passage;

First return oil road;

First load feedback oil path;

First oil drain road;

First working oil circuit; and,

a throttle speed regulating component communicating with the first oil inlet oil passage, the first pilot pressure oil passage and the first oil drain oil passage; the throttle speed regulating assembly passes the first pilot pressure oil passage pair first Throttle speed control of the oil inlet passage;

a first reversing assembly in communication with the first return oil passage, the first drain oil passage, the first working oil passage, and the throttle governing assembly; the first reversing assembly passes through a joint The oil circuit outputted by the flow speed regulating component is reversing to achieve control of the first working oil circuit.

3. The hydraulic system according to claim 2, wherein the throttle speed regulating component comprises:

a pressure compensator (4), the pressure compensator (4) includes an oil inlet, an oil outlet, a first compensation oil passage, and a second compensation oil passage, the oil inlet of the pressure compensator and the first An oil passage is connected;

The hydraulic proportional flow valve (5), the hydraulic proportional flow valve (5) comprises an oil inlet, an oil outlet, a control port and a drain port, and the first compensating oil passage of the pressure compensator (4) And the second compensation oil passage is respectively connected to the oil inlet and the oil outlet of the hydraulic proportional flow valve (5); the oil inlet of the hydraulic proportional flow valve (5) and the pressure compensator are oiled The port is connected; the drain port of the hydraulic proportional flow valve (5) is in communication with the first drain oil passage; An electromagnetic proportional pressure reducing valve (3) for adjusting a flow rate of the liquid proportional proportional flow valve (5); the electromagnetic proportional pressure reducing valve (3) includes an oil inlet port, an oil outlet port and an electromagnetic control end, the electromagnetic The oil inlet of the proportional pressure reducing valve (3) is in communication with the first pilot pressure oil passage, and the oil outlet of the electromagnetic proportional pressure reducing valve (3) is in communication with the control oil port of the liquid control proportional flow valve. The electromagnetic control end of the electromagnetic proportional pressure reducing valve (3) is externally connected to the controller.

4. The hydraulic system according to claim 3, wherein the first reversing assembly comprises:

a first hydraulic reversing unit in communication with the hydraulic proportional valve (5) outlet; a first electromagnetic reversing valve (6) in communication with the first hydraulic reversing unit.

The hydraulic system according to claim 4, wherein the first hydraulic reversing unit comprises:

a first logic valve (21) having a first port communicating with the hydraulic proportional flow valve (5) outlet, a second port of the first logic valve (21) and the first working oil The second port of the road is connected;

a second logic valve (22), the first oil port is connected to the oil control proportional flow valve (5) oil outlet, the second oil port of the second logic valve (22) and the first working oil The first port of the road is connected;

a third logic valve (23), wherein the first oil port is in communication with the first oil return passage, the second oil port of the third logic valve (23) and the second oil of the first working oil passage Port connectivity;

a fourth logic valve (24), wherein the first oil port is in communication with the first oil return passage, the second oil port of the fourth logic valve (24) and the first oil of the first working oil passage The first electromagnetic reversing valve (6) includes an oil inlet port, a drain port, a first oil outlet port and a second oil outlet port; and the first electromagnetic reversing valve (6) a port is connected to the oil control proportional flow valve (5), and a drain port of the first electromagnetic reversing valve (6) is in communication with the first drain oil passage; the first electromagnetic commutation a first oil outlet of the valve (6) is in communication with a control port of the first logic valve (21) and a control port of the fourth logic valve (24); the first electromagnetic reversing valve (6) The second oil outlet is in communication with the control port of the second logic valve (22) and the control port of the third logic valve (23); the first electromagnetic reversing valve (6) includes three Working status: In the first working state, the drain port of the first electromagnetic reversing valve (6) passes through the first oil outlet and the second oil outlet of the first electromagnetic reversing valve (6) respectively a control port of the first logic valve (21), a control port of the second logic valve (22), a control port of the third logic valve (23), and the fourth logic valve (24) Control port connection;

In the second working state, the oil inlet of the first electromagnetic reversing valve (6) passes through the first oil outlet of the first electromagnetic reversing valve (6) and the first logic valve (21) The control port is connected to the control port of the fourth logic valve (24); the drain port of the first electromagnetic reversing valve (6) passes through the first electromagnetic reversing valve (6) The second oil outlet is connected to the control port of the second logic valve (22) and the control port of the third logic valve (23);

In a third working state, the oil inlet of the first electromagnetic reversing valve (6) passes through the second oil outlet of the first electromagnetic reversing valve (6) and the second logic valve (22) The control port is connected to the control port of the third logic valve (23); the drain port of the first electromagnetic reversing valve (6) passes through the first electromagnetic reversing valve (6) An oil outlet is in communication with a control port of the first logic valve (21) and a control port of the fourth logic valve (24).

6. The hydraulic system according to claim 4, wherein the first hydraulic reversing unit comprises:

a first hydraulic reversing valve (9), comprising an oil inlet, a return port, a first control port, a second control port, a first port and a second port; the first hydraulic reversing The oil inlet of the valve (9) is in communication with the oil outlet of the hydraulic proportional flow valve (5); the oil return port of the first hydraulic directional control valve (9) is in communication with the first return oil passage; The first oil outlet and the second oil outlet of the first hydraulic directional control valve (9) are respectively connected with the first oil port and the second oil port of the first working oil passage; the first hydraulic pressure change The valve (9) includes three working states:

In the first working state, the first oil outlet and the second oil outlet of the first hydraulic directional control valve (9) are in communication with the oil return port of the first hydraulic directional control valve (9);

In the second working state, the first oil outlet of the first hydraulic directional control valve (9) is in communication with the oil inlet of the first hydraulic directional control valve (9), the first hydraulic directional control valve a second oil outlet of (9) is in communication with a return port of the first hydraulic directional control valve (9);

In the third working state, the first oil outlet of the first hydraulic directional control valve (9) communicates with the oil return port of the first hydraulic directional control valve (9), the first hydraulic directional control valve Second of (9) The oil outlet is connected to the oil inlet of the first hydraulic directional control valve (9);

The first electromagnetic reversing valve (6) includes an oil inlet port, a drain port, a first oil outlet port and a second oil outlet port; the oil inlet port of the first electromagnetic reversing valve (6) is The first pilot pressure oil passage is connected to or communicates with the hydraulic control proportional flow valve (5) oil outlet, and the drain port of the first electromagnetic reversing valve (6) is in communication with the first drain oil passage; a first oil outlet and a second oil outlet of the first electromagnetic reversing valve (6) are respectively connected to the first control port and the second control port of the first hydraulic reversing valve (9); The first electromagnetic reversing valve (6) includes three working states:

In the first working state, the drain port of the first electromagnetic reversing valve (6) passes through the first oil outlet and the second oil outlet of the first electromagnetic reversing valve (6) respectively The first control port of the first hydraulic directional control valve (9) is in communication with the second control port;

In the second working state, the oil inlet of the first electromagnetic reversing valve (6) passes through the first oil outlet of the first electromagnetic reversing valve (6) and the first hydraulic reversing valve a second control port of (9) is connected; a drain port of the first electromagnetic reversing valve (6) passes through a second oil outlet of the first electromagnetic reversing valve (6) and the first hydraulic pressure The first control port of the reversing valve (9) is connected;

In a third working state, the oil inlet of the first electromagnetic reversing valve (6) passes through the second oil outlet of the first electromagnetic reversing valve (6) and the first hydraulic reversing valve a first control port of (9) is connected; a drain port of the first electromagnetic reversing valve (6) passes through a first oil outlet of the first electromagnetic reversing valve (6) and the first hydraulic pressure The second control port of the reversing valve (9) is connected.

7. The hydraulic system according to claim 6, wherein said first electromagnetic reversing valve (6) is a three-position four-way solenoid valve; and/or

The first hydraulic directional control valve (9) is a three-position four-way hydraulic valve; and/or

The first load feedback oil passage is provided with a first one-way valve (1), and an oil inlet of the first one-way valve (1) is in communication with an oil outlet of the liquid-controlled proportional flow valve (5).

8. The hydraulic system according to any one of claims 1 to 7, wherein the switch reversing valve group comprises:

Second oil inlet road;

Second return oil road; a second load feedback oil path;

Second oil drain road;

Second working oil circuit;

a speed regulating valve (8) communicating with the second oil inlet passage, wherein the speed regulating valve (8) is configured to adjust a flow rate of the second oil inlet passage to stabilize the working speed of the second operating mechanism;

a second commutation communicating with the second oil return passage, the second return oil passage, the second load feedback oil passage, the second drain oil passage, and the second working oil passage The component, the second reversing component adjusts the oil passage outputted by the speed regulating valve (8) to realize the control of the second working oil passage.

9. The hydraulic system according to claim 8, wherein the second load feedback oil passage comprises a first negative feedback oil pipe and a second negative feedback oil pipe;

a second check valve (11) is disposed on the first feedback oil pipe of the second load feedback oil passage, and the oil inlet of the second check valve is connected to the first oil port of the second working oil passage ;

a third check valve (12) is disposed on the second feedback oil pipe of the second load feedback oil passage, and the oil inlet of the third check valve is connected to the second oil port of the second working oil passage .

10. The hydraulic system of claim 9, wherein the second reversing component comprises:

a second hydraulic reversing unit in communication with the speed regulating valve (8);

An electromagnetic reversing valve group in communication with the second hydraulic reversing unit.

The hydraulic system according to claim 10, wherein the electromagnetic reversing valve group comprises a second electromagnetic reversing valve (7) and a third electromagnetic reversing valve (71);

The second hydraulic reversing unit includes:

a fifth logic valve (25), wherein the first oil port is connected to the oil outlet of the speed regulating valve (8); the second oil port of the fifth logic valve (25) and the second working oil circuit The second port is connected; the sixth logic valve (26) has a first port communicating with the throttle port of the governor valve (8); and a second port of the sixth logic valve (26) a first oil port of the second working oil passage is connected; a seventh logic valve (27), the first oil port is connected to the second oil return oil passage; and the second logic valve (27) is second The oil port is connected to the second oil port of the second working oil passage; the eighth logic valve (28), the first oil port is connected to the second oil return oil passage; a second port of the eighth logic valve (28) is in communication with the first port of the second working oil passage;

The second electromagnetic reversing valve (7) includes an oil inlet port, a drain port, a first oil outlet port and a second oil outlet port, and the oil inlet port of the second electromagnetic reversing valve (7) is a second oil inlet passage is connected, a drain port of the second electromagnetic reversing valve (7) is in communication with the second drain oil passage, and a first oil outlet of the second electromagnetic reversing valve (7) The port is connected to the control port of the fifth logic valve (25); the second oil outlet of the second electromagnetic reversing valve (7) is in communication with the control port of the seventh logic valve (27); The second electromagnetic reversing valve (7) includes two working states:

In the first working state, the oil inlet of the second electromagnetic reversing valve (7) passes through the first oil outlet of the second electromagnetic reversing valve (7) and the fifth logic valve (25) The control port is connected; the drain port of the second electromagnetic reversing valve (7) passes through the second oil outlet of the second electromagnetic reversing valve (7) and the seventh logic valve (27) Control port connection;

In the second working state, the oil inlet of the second electromagnetic reversing valve (7) passes through the second oil outlet of the second electromagnetic reversing valve (7) and the seventh logic valve (27) The control port is connected; the drain port of the second electromagnetic reversing valve (7) passes through the first oil outlet of the second electromagnetic reversing valve (7) and the fifth logic valve (25) Control port connection;

The third electromagnetic reversing valve (71) includes an oil inlet port, a drain port, a first oil outlet port and a second oil outlet port, and the oil inlet port of the third electromagnetic reversing valve (71) is a second oil inlet passage is connected, a drain port of the third electromagnetic reversing valve (71) is in communication with the second drain oil passage; and a first oil outlet of the third electromagnetic reversing valve (71) The port is connected to the control port of the sixth logic valve (26); the second oil outlet of the third electromagnetic reversing valve (71) is in communication with the control port of the eighth logic valve (28); The third electromagnetic reversing valve (71) includes the third electromagnetic reversing valve (71) working in cooperation with the first working state and the second working state of the second electromagnetic reversing valve (7). State and second working state, wherein

The third working state of the third electromagnetic reversing valve (71) includes: the oil inlet of the third electromagnetic reversing valve (71) passes through the first oil outlet of the third electromagnetic reversing valve (71) Communicating with a control port of the sixth logic valve (26); a drain port of the third electromagnetic reversing valve (71) passes through a second oil outlet of the third electromagnetic reversing valve (71) The control port of the eighth logic valve (28) is connected; The second working state of the third electromagnetic reversing valve (71) includes: the oil inlet of the third electromagnetic reversing valve (71) passes through the second oil outlet of the third electromagnetic reversing valve (71) Communicating with a control port of the eighth logic valve (28); a drain port of the third electromagnetic reversing valve (71) passes through a first oil outlet of the third electromagnetic reversing valve (71) The control port of the sixth logic valve (26) is in communication.

12. The hydraulic system according to claim 11, wherein said second electromagnetic reversing valve (7) is a two-position four-way solenoid valve, and/or

The third electromagnetic reversing valve (71) is a two-position four-way solenoid valve.

13. The hydraulic system according to claim 10, characterized in that

The switch reversing valve group further includes a second pilot pressure oil circuit;

The electromagnetic reversing valve group includes a fourth electromagnetic reversing valve (61);

The second hydraulic reversing unit includes:

a second hydraulic reversing valve (91), comprising an oil inlet, a return port, a first control port, a second control port, a first port and a second port; the second hydraulic reversing The oil inlet of the valve (91) is in communication with the oil outlet of the speed regulating valve (8); the oil return port of the second hydraulic switching valve (91) is in communication with the second return oil passage; a first oil outlet and a second oil outlet of the second hydraulic directional control valve (91) are respectively connected to the first oil port and the second oil port of the second working oil passage; the second hydraulic directional control valve (91) Includes three working states:

In the first working state, the first oil outlet and the second oil outlet of the second hydraulic directional control valve (91) are in communication with the oil return port of the second hydraulic directional control valve (91);

In the second working state, the first oil outlet of the second hydraulic directional control valve (91) is in communication with the oil inlet of the second hydraulic directional control valve (91), and the second hydraulic directional control valve a second oil outlet of (91) is in communication with a return port of the second hydraulic directional control valve (91);

In the third working state, the first oil outlet of the second hydraulic directional control valve (91) is in communication with the oil return port of the second hydraulic directional control valve (91), and the second hydraulic directional control valve a second oil outlet of (91) is in communication with an oil inlet of the second hydraulic directional control valve (91);

The fourth electromagnetic reversing valve (61) includes an oil inlet, a drain port, a first oil outlet and a second oil outlet; the oil inlet of the fourth electromagnetic reversing valve (61) is a second pilot pressure oil passage is connected to or communicates with the oil pressure regulating port of the speed regulating valve (8), and the fourth electromagnetic reversing valve (61) The drain port is in communication with the second drain oil passage; the first oil outlet port and the second oil outlet port of the fourth electromagnetic reversing valve (61) and the second hydraulic reversing valve (91) The first control port is connected to the second control port; the fourth electromagnetic reversing valve (61) includes three operating states for controlling the second hydraulic reversing valve (91) to perform different working states:

In the first working state, the drain port of the fourth electromagnetic reversing valve (61) passes through the first oil outlet and the second oil outlet of the fourth electromagnetic reversing valve (61) respectively The first control port of the second hydraulic directional control valve (91) is in communication with the second control port;

In the second working state, the oil inlet of the fourth electromagnetic reversing valve (61) passes through the first oil outlet of the fourth electromagnetic reversing valve (61) and the second hydraulic reversing valve a second control port of (91) is connected; a drain port of the fourth electromagnetic reversing valve (61) passes through a second oil outlet of the fourth electromagnetic reversing valve (61) and the second hydraulic pressure The first control port of the reversing valve (91) is connected;

In a third working state, the oil inlet of the fourth electromagnetic reversing valve (61) passes through the second oil outlet of the fourth electromagnetic reversing valve (61) and the second hydraulic reversing valve a first control port of (91) is connected; a drain port of the fourth electromagnetic reversing valve (61) passes through a first oil outlet of the fourth electromagnetic reversing valve (61) and the second hydraulic pressure The second control port of the reversing valve (91) is in communication.

14. The hydraulic system according to claim 13, wherein said fourth electromagnetic reversing valve (61) is a three-position four-way solenoid valve; and/or

The second hydraulic directional control valve (91) is a three-position four-way hydraulic valve.

A roadheader, characterized in that the roadheader is provided with the hydraulic system of any one of claims 1-14.

The roadheader according to claim 15, wherein the first action mechanism comprises: a cutting head lifting, a rotary cylinder, and a traveling motor;

The second action mechanism includes: a shovel and a rear support.