EP1393817A2 - Device for applying coating material - Google Patents

Device for applying coating material Download PDF

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Publication number
EP1393817A2
EP1393817A2 EP03019218A EP03019218A EP1393817A2 EP 1393817 A2 EP1393817 A2 EP 1393817A2 EP 03019218 A EP03019218 A EP 03019218A EP 03019218 A EP03019218 A EP 03019218A EP 1393817 A2 EP1393817 A2 EP 1393817A2
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EP
European Patent Office
Prior art keywords
spray
substrate
controller
nozzle opening
setpoint
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP03019218A
Other languages
German (de)
French (fr)
Other versions
EP1393817A3 (en
EP1393817B1 (en
Inventor
Leonhard Kistler
Robert Vögel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Amtec Kistler GmbH
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Amtec Kistler GmbH
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Filing date
Publication date
Application filed by Amtec Kistler GmbH filed Critical Amtec Kistler GmbH
Publication of EP1393817A2 publication Critical patent/EP1393817A2/en
Publication of EP1393817A3 publication Critical patent/EP1393817A3/en
Application granted granted Critical
Publication of EP1393817B1 publication Critical patent/EP1393817B1/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/10—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to temperature or viscosity of liquid or other fluent material discharged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B05B1/3053—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice the actuating means being a solenoid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/085—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to flow or pressure of liquid or other fluent material to be discharged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/12—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus
    • B05B12/122—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to conditions of ambient medium or target, e.g. humidity, temperature position or movement of the target relative to the spray apparatus responsive to presence or shape of target
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/06—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane
    • B05B7/062—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet
    • B05B7/066—Spray pistols; Apparatus for discharge with at least one outlet orifice surrounding another approximately in the same plane with only one liquid outlet and at least one gas outlet with an inner liquid outlet surrounded by at least one annular gas outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/1693—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed with means for heating the material to be sprayed or an atomizing fluid in a supply hose or the like

Definitions

  • the invention relates to a device for applying a Coating agent on a substrate, in particular for applying a Lubricant on a sheet fed to a deep-drawing press, with at least a by means of a closure member, which by means of an associated Positioning device is positionable, with regard to their effective Outlet surface changeable nozzle opening having spray valve, on the substrate is moved past and the coating agent via a supply line with pressure can be supplied.
  • the closure member is an opening movement limiting Assigned fixed stop, which is designed as a rotatable cam, the one the dependence between the speed of the substrate and the for a constant layer thickness required outflow rate of the Coating agent or the assigned this position of the Closing member has the following contour and which is rotatable and so is rotated, that you are the current speed of the substrate assigned circumferential area is effective as a stop.
  • Disturbance variables such as an existing in the region of the nozzle opening Contamination, a change in the viscosity of the coating agent and the like, however, may lead to inaccuracies. It can therefore come to a lack of lubricant, resulting in a Damage to the thermoformed blank during the thermoforming process and thus leading to the production of rejects. In long-term operation is therefore Frequent, preventive maintenance with short maintenance intervals necessary to prevent such dangers.
  • Another disadvantage can be seen in the fact that even with a proper function only the constant layer thickness can be generated. This must be on orient the maximum demand that exists only in some places, which leads to an unnecessarily high consumption of coating agent.
  • the Closure member by means of the associated positioning is permanently adjustable within a predetermined setting field, wherein the positioning device is associated with a controller, at least a setpoint input for the currently required outflow rate of the Coating agent from the spray valve and at least one actual value input for the mass flow rate in one of the nozzle opening upstream supply section has and from the Control deviation a positioning in the sense of a repeal forms the control deviation influencing control signal.
  • a closed Control circuit for controlling the outflow rate, in conjunction with the Speed of the substrate gives the desired coating thickness.
  • the control according to the invention advantageously comprises all the Outflow rate influencing parameters.
  • the influence of disturbances is therefore eliminated in an advantageous manner.
  • This allows a long time Maintenance intervals and still ensures long-term operation a high accuracy.
  • the production of in consequence of a faulty Coating unusable parts can hereby be more advantageous Way to prevent as far as possible.
  • Due to the permanent adjustability the closure member can be by specifying a corresponding Setpoint advantageously also any desired coating thickness and accordingly also a coating profile with changing Achieve thickness over the coating length with high accuracy. In this way, the consumption of coating agent can be optimized.
  • the advantages achievable with the invention are therefore particularly in to see excellent profitability.
  • a further advantageous measure may be that the controller an additional setpoint input for the desired temperature of the Coating agent and an additional actual value input for the Temperature in one of the nozzle opening upstream supply section has and from the control deviation a control signal for Adjustment of a supply section upstream of a nozzle opening associated heating device forms.
  • the spray valve with coating agent supplying Supply line be provided with a venturi cover, the one Pressure compensator is assigned.
  • the controller can be integrated into the associated spray valve be. This results in a simple and compact design, in which a Peripheral cabling is eliminated.
  • a further advantageous embodiment of the higher-level measures may be that over the width of the substrate several, respectively controllable by a regulator spray valves are provided and that the Controller of all spray valves with a common setpoint adjuster are connected in which the film thickness profiles of the Spray valves associated with zones of the substrate are stored and which forms the nominal values for all spray valves, wherein between the Setpoint adjuster and the regulators of the spray valves advantageously a data bus can be provided.
  • a data bus can be provided.
  • Main field of application of the present invention is the Deep-drawing deformation of sheets.
  • a lubricant usually oil, coated. This coating is usually done on both sides. Because the However, plates do not glide over their entire surface are exposed to the need to save lubricant on demand Distribution of the lubricant on the surface of the sheet to be formed he wishes.
  • the material to be formed by means of the deep-drawing press ie the substrate, is the deep drawing press doing either in the form of metal sheets or in Fed form of an endless belt.
  • the arrangement of Figure 1 is located the processing of metal sheets 1 basis. These are included uniform spacing consecutive on one here as a conveyor belt trained assigned to the deep drawing press, not shown Feed device 2 recorded by means of a Drive device 3 is driven. At every stroke of the deep-drawing press a metal sheet 1 is transformed. The plates must therefore in time with the Deep drawing press are supplied. The same is true for a course endless band.
  • the material to be subjected to a deep-drawing process is usually As already mentioned, coated on both sides with a lubricant. However, to simplify the illustration, only one is shown in FIG Coating shown from above. A similar device can be used for the coating be provided from below.
  • the illustrated coating apparatus includes a plurality of over the Width of the substrate to be coated, in this case the metal sheet 1, arranged spray valves 4. These each contain, as best of Figure 2 can be seen, a spray head 4a with a storage chamber 5, in which the lubricant used, in the example shown, under Pressure is present and conical from one to its output narrowing nozzle opening 6 goes off, the effective opening cross-section 7 is variable by means of an adjustable closure member.
  • the closure member 7 is here one with a conical Tip provided in the nozzle opening 6 engaging nozzle needle, the by means of a suitably designed as a linear motor Drive device 8 within its Einstellfeldes, all positions between completely closed and fully open, in the axial direction is movable.
  • the above-mentioned linear motor can be used as a solenoid be formed, which via a supply loop 9 with a Power source, in the example shown connected to the power grid 10 is.
  • a supply line 11 In the storage chamber 5 opens a supply line 11, via the lubricant with the desired pressure in the storage chamber. 5 is fed.
  • the supply line 11 is not one closer illustrated pressure source, such as an oil pump, connected.
  • the lubricant takes place in the example shown Spray air use.
  • a shut-off valve 15 is provided, through which the Air supply to the pressure chamber 13 and thus to the air outlet opening on and is deductible.
  • the outflow rate that is, the mass flow rate through the nozzle opening. 6 per unit time, which together with the speed of the too Coating substrate results in the coating thickness, by means of a a closed loop containing, in Figure 2 by a dash-dotted outline indicated control device 40 regulated.
  • Each nozzle opening 6 is associated with a controller 16, the a setpoint input 17 for the currently required outflow rate, the means for those currently under the nozzle opening 6 are located Location of the substrate required Gleitffenmenge, and an actual value input 18 for the mass flow through the supply line 11, the practically corresponds to the mass flow rate through the nozzle opening 6, and that of the control deviation, that is from the difference between setpoint and actual value, forms a control signal, by which the Closing member 7 forming valve needle is adjusted so that the Control deviation disappears.
  • the lifting device 8 forming the lifting magnet with more or less power applied.
  • a throttle device 19 is arranged, which via a signal line 20 with the signal output of the associated controller 16 is connected and through in response to the output from the controller 16 signal the Current application of the drive device 8 forming Hubmagnetanowskiowskiowski.
  • To form the regulator 16 is appropriate programmable microprocessor used. By means of the regulator 16 becomes expediently the air supply up and down, as by a from the controller 16 to the shut-off valve 15 leading signal line 21 indicated is. There is no regulation, but only an up and down control instead, wherein the air admission begins as soon as the nozzle opening. 6 is opened and vice versa.
  • the setpoint for the mass flow rate comes from a suitable, in Figure 2 indicated by a circle setpoint adjuster 22.
  • the actual value is by a in Figure 2 only indicated sensor 23rd added.
  • a Venturiblende 24 that is with a cross-sectional constriction, be provided, which is associated with a pressure compensator 25, the one desired actual value of the mass flow rate corresponding output signal supplies.
  • the pressure compensator 25 With the pressure compensator 25, the pressures in the Venturi cap 24 and in a line section outside thereof measured.
  • the cross-sectional difference between Venturiblende 24 and the other supply line 11 leads to different Speeds in the area of the venturi 24 and outside thereof. These different speeds lead to different Press, which therefore in conjunction with the respective associated cross section the speed and thus the mass flow rate can be determined.
  • the regulators 16 of all spray valves 4 is expedient, as shown in FIG. 1 it can be seen, a common setpoint adjuster 22 assigned, the expediently via a data bus 26 indicated by signal lines is connected to the regulators 16 all spray valves 4, the one for this purpose contain suitable interface.
  • the setpoint adjuster 22 is appropriate formed as a computer, which is provided with a memory in which the desired layer thickness values in the area of the spray valves 4 respectively associated zones of the substrate are stored. It can constant values or values of a layer thickness profile act. To enter these values is the setpoint adjuster 22 forming Computer provided with a suitable input device 22a.
  • the setpoint adjuster 22 forming computer is equipped with sensors for Determining the position of the substrate relative to the spray valves 6 coupled. For this purpose, one with the transport device. 2 associated drive device 3 cooperating Incremental 28 provided at each, a certain Rotation angle corresponding step generates a signal and its output is located at an associated input 27 of the setpoint adjuster 22. Of the this forming computer can from the number of signals the Transport distance and from the number of signals per unit time the Calculate the speed of the metal sheets 1. The calculation will by means of a sensor 29 scanning the leading edge of the metal sheets 1, which can be configured, for example, as a light barrier, started, its output with a suitable input 30 of the setpoint adjuster 22 forming computer is connected.
  • the spray valves 4 are expediently shortly before the opening of the nozzle opening 6 switched on. This can also be done by means of the sensor 29 generated signals are accomplished.
  • the sensor 29 is simple arranged by a certain amount in front of the spray nozzles 4, so that these first focused and then with the distance to the sensor 29 corresponding time delay can be opened.
  • the temperature of the Spray valves 4 supplied lubricant at a desired level held constant, resulting in a constant viscosity.
  • a throttle device 33 arranged by the associated Regulator 16 can be influenced. This is with a setpoint input 34 for a temperature setpoint and an actual value input 35 for the actual value the temperature of the spray nozzle 4 supplied lubricant provided.
  • the actual value of the temperature is determined by means of a temperature sensor 36 added. This can be done to achieve a compact arrangement in 3 of the underlying measuring device for measuring the Mass flow rate to be integrated.
  • the controller 16 via the input 24th a constant temperature setpoint specified.
  • This can also be in the common setpoint adjuster 22 be stored and of this for all Issue spray valves 4 and transmitted by the data bus 26 become.
  • the temperature setpoint by means of Setpoint adjuster 22 to vary, thereby adding the outflow rate in addition to the position of the closure member 7 forming valve needle vary.
  • the common setpoint adjuster 22 requires one in each case Memory for the temperature setpoints and in case of a variation of these Setpoints a program suitable for this purpose.
  • Control device 40 is expedient, as indicated in Figure 1, in the associated spray valve 4 integrated.

Abstract

The spray valve needle (7) is continuously-adjustable within a given range by a controller (16). This has a desired value input (17) for the instantaneously-demanded coating flowrate passed by the spray valve (4). It has an actual value input (18) for the mass flowrate passing through a supply section ahead of the nozzle opening (6). An actuator is signaled by the controller, to correct departures.

Description

Die Erfindung betrifft eine Vorrichtung zum Auftragen eines Beschichtungsmittels auf ein Substrat, insbesondere zum Auftragen eines Gleitmittels auf ein einer Tiefziehpresse zuführbares Blech, mit wenigstens einem eine mittels eines Verschlussorgans, das mittels einer zugeordneten Positioniereinrichtung positionierbar ist, hinsichtlich ihrer wirksamen Austrittsfläche veränderbare Düsenöffnung aufweisenden Sprühventil, an dem das Substrat vorbeibewegbar ist und dem das Beschichtungsmittel über eine Versorgungsleitung mit Druck zuführbar ist.The invention relates to a device for applying a Coating agent on a substrate, in particular for applying a Lubricant on a sheet fed to a deep-drawing press, with at least a by means of a closure member, which by means of an associated Positioning device is positionable, with regard to their effective Outlet surface changeable nozzle opening having spray valve, on the substrate is moved past and the coating agent via a supply line with pressure can be supplied.

Eine derartige Anordnung ist in der DE 101 39 633.3 angegeben. Die hierin beschriebene Anordnung dient zur Erzeugung einer konstanten Schichtdicke des Gleitmittels auf dem einer Tiefziehpresse zugeführten Blech, das während des Zuführvorgangs beschleunigt und verzögert wird. Dabei ist dem Verschlussorgan ein seine Öffnungsbewegung begrenzender Festanschlag zugeordnet, der als drehbare Nocke ausgebildet ist, die eine der Abhängigkeit zwischen der Geschwindigkeit des Substrats und der für eine konstante Schichtdicke benötigten Ausflussrate des Beschichtungsmittels bzw. der dieser zugeordneten Stellung des Verschlussorgans folgende Kontur aufweist und die drehbar ist und so gedreht wird, dass ihr der momentanen Geschwindigkeit des Substrats zugeordneter Umfangsbereich als Anschlag wirksam ist. Diese Maßnahmen ergeben praktisch eine Festwertsteuerung, bei der die Stellung des Verschlussorgans gemäß einer festen Abhängigkeit von der Geschwindigkeit des Substrats eingestellt wird. Solange dabei keine Störgrößen wirksam sind, lässt sich hiermit die gewünschte Schichtdicke erreichen. Störgrößen, wie eine im Bereich der Düsenöffnung vorhandene Verschmutzung, eine Änderung der Viskosität des Beschichtungsmittels und dergleichen, können jedoch zu Ungenauigkeiten führen. Es kann daher zu einem Mangel an Gleitmittel kommen, was zu einer Beschädigung des Tiefziehformlings während des Tiefziehvorgangs und damit zur Produktion von Ausschuss führt. Im Langzeitbetrieb ist daher eine häufige, vorbeugende Wartung mit kurzen Wartungsintervallen erforderlich, um derartigen Gefahren vorzubeugen. Ein weiterer Nachteil ist darin zu sehen, dass auch bei einer ordnungsgemäßen Funktion nur die konstante Schichtdicke erzeugt werden kann. Diese muss sich aber an dem nur an einigen Stellen vorhandenen, maximalen Bedarf orientieren, was zu einem unnötig hohen Verbrauch an Beschichtungsmittel führt.Such an arrangement is specified in DE 101 39 633.3. The Arrangement described herein serves to generate a constant Layer thickness of the lubricant supplied on a deep-drawing press Sheet metal that is accelerated and decelerated during the feeding process. In this case, the closure member is an opening movement limiting Assigned fixed stop, which is designed as a rotatable cam, the one the dependence between the speed of the substrate and the for a constant layer thickness required outflow rate of the Coating agent or the assigned this position of the Closing member has the following contour and which is rotatable and so is rotated, that you are the current speed of the substrate assigned circumferential area is effective as a stop. These Measures practically result in a fixed value control, in which the Position of the closure member according to a fixed dependence on the Speed of the substrate is adjusted. As long as none Disturbance variables are effective, this can be the desired layer thickness to reach. Disturbance variables, such as an existing in the region of the nozzle opening Contamination, a change in the viscosity of the coating agent and the like, however, may lead to inaccuracies. It can therefore come to a lack of lubricant, resulting in a Damage to the thermoformed blank during the thermoforming process and thus leading to the production of rejects. In long-term operation is therefore Frequent, preventive maintenance with short maintenance intervals necessary to prevent such dangers. Another disadvantage can be seen in the fact that even with a proper function only the constant layer thickness can be generated. This must be on orient the maximum demand that exists only in some places, which leads to an unnecessarily high consumption of coating agent.

Hiervon ausgehend ist es daher die Aufgabe der vorliegenden Erfindung, eine Vorrichtung eingangs erwähnter Art mit einfachen und kostengünstigen Mitteln so zu verbessern, dass trotz eines geringen Wartungsaufwands auch im Langzeitbetrieb eine hohe Genauigkeit gewährleistet ist.On this basis, it is the object of the present invention, a device of the type mentioned with simple and cost-effective means to improve so that, despite a small Maintenance costs even in long-term operation a high accuracy is guaranteed.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass das Verschlussorgan mittels der zugeordneten Positioniereinrichtung permanent innerhalb eines vorgegebenen Einstellfelds einstellbar ist, wobei der Positioniereinrichtung ein Regler zugeordnet ist, der zumindest einen Sollwert-Eingang für die momentan benötigte Ausflussrate des Beschichtungsmittels aus dem Sprühventil und wenigstens einen Istwert-Eingang für den Massendurchsatz in einem der Düsenöffnung vorgeordneten Versorgungsabschnitt aufweist und der aus der Regelabweichung ein die Positioniereinrichtung im Sinne einer Aufhebung der Regelabweichung beeinflussendes Stellsignal bildet.This object is achieved in that the Closure member by means of the associated positioning is permanently adjustable within a predetermined setting field, wherein the positioning device is associated with a controller, at least a setpoint input for the currently required outflow rate of the Coating agent from the spray valve and at least one actual value input for the mass flow rate in one of the nozzle opening upstream supply section has and from the Control deviation a positioning in the sense of a repeal forms the control deviation influencing control signal.

Diese Maßnahmen ergeben in vorteilhafter Weise einen geschlossenen Regelkreis zur Regelung der Ausflussrate, die in Verbindung mit der Geschwindigkeit des Substrats die gewünschte Beschichtungsdicke ergibt. Die erfindungsgemäße Regelung umfasst in vorteilhafter Weise alle die Ausflussrate beeinflussenden Parameter. Der Einfluss von Störgrößen wird daher in vorteilhafter Weise eliminiert. Dies ermöglicht lange Wartungsintervalle und gewährleistet dennoch auch im Langzeitbetrieb eine hohe Genauigkeit. Die Produktion von in Folge einer fehlerhaften Beschichtung unbrauchbaren Teilen lässt sich hiermit in vorteilhafter Weise weitestgehend verhindern. Infolge der permanenten Verstellbarkeit des Verschlussorgans lässt sich durch Vorgabe eines entsprechenden Sollwerts in vorteilhafter Weise auch jede gewünschte Beschichtungsdicke und dementsprechend auch ein Beschichtungsprofil mit sich ändernder Dicke über der Beschichtungslänge mit hoher Exaktheit erreichen. Hierdurch lässt sich der Verbrauch an Beschichtungsmittel optimieren. Die mit der Erfindung erzielbaren Vorteile sind daher insbesondere in einer ausgezeichneten Wirtschaftlichkeit zu sehen.These measures result in an advantageous manner a closed Control circuit for controlling the outflow rate, in conjunction with the Speed of the substrate gives the desired coating thickness. The control according to the invention advantageously comprises all the Outflow rate influencing parameters. The influence of disturbances is therefore eliminated in an advantageous manner. This allows a long time Maintenance intervals and still ensures long-term operation a high accuracy. The production of in consequence of a faulty Coating unusable parts can hereby be more advantageous Way to prevent as far as possible. Due to the permanent adjustability the closure member can be by specifying a corresponding Setpoint advantageously also any desired coating thickness and accordingly also a coating profile with changing Achieve thickness over the coating length with high accuracy. In this way, the consumption of coating agent can be optimized. The advantages achievable with the invention are therefore particularly in to see excellent profitability.

Vorteilhafte Ausgestaltungen und zweckmäßige Fortbildungen der übergeordneten Maßnahmen sind in den Unteransprüchen angegeben. So kann zweckmäßig die Position des Substrats innerhalb seines die Sprühdüse passierenden Wegs mittels einer Wegmesseinrichtung erfasst werden, deren Ausgang am Eingang eines als Rechner ausgebildeten Sollwert-Stellers liegt, in welchem die gewünschte Schichtdicke bzw. das gewünschte Schichtdickenprofil gespeichert ist und der aus dem Momentanwert der Position des Substrats und der dieser Position zugeordneten Schichtdicke den Sollwert für die Ausflussrate bildet. Diese Maßnahmen ergeben eine Kaskadenregelung, bei der in vorteilhafter Weise über die Wegmessung auch die Geschwindigkeit des Substrats berücksichtigt wird, so dass auch bei einem gewünschten Schichtdickenprofil eine hohe Genauigkeit erreicht wird.Advantageous embodiments and expedient further developments of Parent measures are specified in the subclaims. So may suitably the position of the substrate within its the Spray nozzle passing path detected by a displacement measuring device whose output is at the entrance of a trained as a computer Setpoint adjuster is in which the desired layer thickness or desired layer thickness profile is stored and the from the Instantaneous value of the position of the substrate and of this position assigned layer thickness forms the target value for the outflow rate. These Measures result in a cascade, in which advantageously About the path measurement and the speed of the substrate is taken into account, so even at a desired Layer thickness profile high accuracy is achieved.

Eine weitere vorteilhafte Maßnahme kann darin bestehen, dass der Regler einen zusätzlichen Sollwert-Eingang für die gewünschte Temperatur des Beschichtungsmittels und einen zusätzlichen Istwert-Eingang für die Temperatur in einem der Düsenöffnung vorgeordneten Versorgungsabschnitt aufweist und aus der Regelabweichung ein Stellsignal zur Einstellung einer einem der Düsenöffnung vorgeordneten Versorgungsabschnitt zugeordneten Heizeinrichtung bildet. Diese Maßnahmen ermöglichen in vorteilhafter Weise nicht nur die Einhaltung einer konstanten Temperatur, sondern vielmehr auch eine Änderung der Temperatur zusätzlich zur Änderung der Düsenöffnung und ergeben damit eine zusätzliche Möglichkeit zur Beeinflussung der Ausflussrate. Dies kann vor allem dann von Vorteil sein, wenn bei eingestellter, größter Öffnung eine weitere Steigerung der Ausflussrate erforderlich ist.A further advantageous measure may be that the controller an additional setpoint input for the desired temperature of the Coating agent and an additional actual value input for the Temperature in one of the nozzle opening upstream supply section has and from the control deviation a control signal for Adjustment of a supply section upstream of a nozzle opening associated heating device forms. These measures advantageously not only make it possible to comply with one constant temperature, but also a change of Temperature in addition to changing the nozzle opening and yield thus an additional possibility for influencing the outflow rate. This can be especially advantageous if set at the largest Opening a further increase in the outflow rate is required.

Vorteilhaft kann die das Sprühventil mit Beschichtungsmittel versorgende Versorgungsleitung mit einer Venturiblende versehen sein, der eine Druckwaage zugeordnet ist. Diese Maßnahmen ergeben eine einfache und dennoch sehr genaue Sensoranordnung zur Aufnahme des Massenstroms in der Versorgungsleitung.Advantageously, the spray valve with coating agent supplying Supply line be provided with a venturi cover, the one Pressure compensator is assigned. These measures result in a simple and nevertheless very accurate sensor arrangement for receiving the mass flow in the supply line.

In weiterer Fortbildung der übergeordneten Maßnahmen kann eine Anzeige und/oder Aufzeichnungseinrichtung zur Anzeige und/oder Aufzeichnung der Regelabweichung vorgesehen sein. Diese Maßnahme ermöglicht eine einfache Kontrolle und erleichtert eine nachträglich Fehlersuche.In further training of the superordinate measures one can Display and / or recording device for display and / or Recording the control deviation be provided. This measure allows easy control and makes it easier to retrofit Troubleshooting.

Zweckmäßig kann der Regler in das zugeordnete Sprühventil integriert sein. Diese ergibt eine einfache und kompakte Ausführung, bei der eine Peripherieverkabelung entfällt. Suitably, the controller can be integrated into the associated spray valve be. This results in a simple and compact design, in which a Peripheral cabling is eliminated.

Eine weitere vorteilhafte Ausgestaltung der übergeordneten Maßnahmen kann darin bestehen, dass über der Breite des Substrats mehrere, jeweils durch einen Regler regelbare Sprühventile vorgesehen sind und dass die Regler aller Sprühventile mit einem gemeinsamen Sollwertsteller verbunden sind, in welchem die Schichtdickenprofile der den Sprühventilen zugeordneten Zonen des Substrats gespeichert sind und der die Sollwerte für alle Sprühventile bildet, wobei zwischen dem Sollwertsteller und den Reglern der Sprühventile vorteilhaft ein Datenbus vorgesehen sein kann. Hierdurch wird eine besonders einfache und kompakte Ausführung erreicht.A further advantageous embodiment of the higher-level measures may be that over the width of the substrate several, respectively controllable by a regulator spray valves are provided and that the Controller of all spray valves with a common setpoint adjuster are connected in which the film thickness profiles of the Spray valves associated with zones of the substrate are stored and which forms the nominal values for all spray valves, wherein between the Setpoint adjuster and the regulators of the spray valves advantageously a data bus can be provided. This will be a particularly simple and achieved compact design.

Weitere vorteilhafte Ausgestaltungen und zweckmäßige Fortbildungen der übergeordneten Maßnahmen sind in den restlichen Unteransprüchen angegeben und aus der nachstehenden Beispielsbeschreibung anhand der Zeichnung näher entnehmbar.Further advantageous embodiments and expedient developments of Parent measures are in the remaining subclaims and from the following example description on the basis of Drawing closer.

In der nachstehend beschriebenen Zeichnung zeigen:

Figur 1
eine Frontansicht einer erfindungsgemäßen Auftragvorrichtung in schematischer Darstellung,
Figur 2
eine schematische Darstellung eines Sprühventils der Anordnung gemäß Figur 1 und
Figur 3
eine schematische Darstellung eines Durchsatz- und Temperaturfühlers der Anordnung gemäß Figur 1.
In the drawing described below:
FIG. 1
a front view of an applicator device according to the invention in a schematic representation,
FIG. 2
a schematic representation of a spray valve of the arrangement according to Figure 1 and
FIG. 3
a schematic representation of a flow rate and temperature sensor of the arrangement of Figure 1.

Hauptanwendungsgebiet der vorliegenden Erfindung ist die Tiefziehverformung von Blechen. Beim Tiefziehen ergeben sich Gleitbewegungen zwischen Werkzeug und Werkstück. Um dabei ein sauberes, störungsfreies Gleiten zu ermöglichen, werden die der Tiefziehpresse zugeführten Bleche mit einem Gleitmittel, in der Regel Öl, beschichtet. Diese Beschichtung erfolgt in der Regel beidseitig. Da die Bleche jedoch nicht auf ihrer ganzen Oberfläche einer Gleitbewegung ausgesetzt sind, ist zur Einsparung von Gleitmittel eine bedarfsgerechte Verteilung des Gleitmittels auf der Oberfläche des umzuformenden Blechs erwünscht.Main field of application of the present invention is the Deep-drawing deformation of sheets. When deep drawing arise Sliding movements between tool and workpiece. To do so Clean, trouble-free gliding to allow the deep drawing press supplied sheets with a lubricant, usually oil, coated. This coating is usually done on both sides. Because the However, plates do not glide over their entire surface are exposed to the need to save lubricant on demand Distribution of the lubricant on the surface of the sheet to be formed he wishes.

Das mittels der Tiefziehpresse umzuformende Material, also das Substrat, wird der Tiefziehpresse dabei entweder in Form von Blechtafeln oder in Form eines endlosen Bands zugeführt. Der Anordnung gemäß Figur 1 liegt die Verarbeitung von Blechtafeln 1 zugrunde. Diese sind dabei mit gleichmäßigem Abstand aufeinander folgend auf einer hier als Förderband ausgebildeten, der nicht näher dargestellten Tiefziehpresse zugeordneten Vorschubeinrichtung 2 aufgenommen, die mittels einer Antriebseinrichtung 3 antreibbar ist. Bei jedem Takt der Tiefziehpresse wird eine Blechtafel 1 umgeformt. Die Tafeln müssen daher im Takt der Tiefziehpresse zugeführt werden. Dasselbe gilt natürlich auch für ein endloses Band.The material to be formed by means of the deep-drawing press, ie the substrate, is the deep drawing press doing either in the form of metal sheets or in Fed form of an endless belt. The arrangement of Figure 1 is located the processing of metal sheets 1 basis. These are included uniform spacing consecutive on one here as a conveyor belt trained assigned to the deep drawing press, not shown Feed device 2 recorded by means of a Drive device 3 is driven. At every stroke of the deep-drawing press a metal sheet 1 is transformed. The plates must therefore in time with the Deep drawing press are supplied. The same is true for a course endless band.

Das einem Tiefziehvorgang zu unterwerfende Material wird in der Regel, wie schon erwähnt, auf beiden Seiten mit einem Gleitmittel beschichtet. Zur Vereinfachung der Darstellung ist in Figur 1 jedoch nur eine Beschichtung von oben dargestellt. Eine ähnliche Vorrichtung kann für die Beschichtung von unten vorgesehen sein.The material to be subjected to a deep-drawing process is usually As already mentioned, coated on both sides with a lubricant. However, to simplify the illustration, only one is shown in FIG Coating shown from above. A similar device can be used for the coating be provided from below.

Die dargestellte Beschichtungsvorrichtung enthält mehrere, über der Breite des zu beschichtenden Substrats, also hier der Blechtafel 1, angeordnete Sprühventile 4. Diese enthalten jeweils, wie am besten aus Figur 2 erkennbar ist, einen Sprühkopf 4a mit einer Speicherkammer 5, in welcher das verwendete Gleitmittel, im dargestellten Beispiel Öl, unter Druck ansteht und von der eine zu ihrem Ausgang hin konisch sich verengende Düsenöffnung 6 abgeht, deren wirksamer Öffnungsquerschnitt mittels eines verstellbaren Verschlussorgans 7 veränderbar ist. Zur Bildung des Verschlussorgans 7 ist hier eine mit einer konischen Spitze in die Düsenöffnung 6 eingreifende Düsennadel vorgesehen, die mittels einer zweckmäßig als Linearmotor ausgebildeten Antriebseinrichtung 8 innerhalb ihres Einstellfeldes, das alle Positionen zwischen ganz geschlossen und ganz geöffnet umfasst, in axialer Richtung bewegbar ist. Der vorstehend genannte Linearmotor kann als Hubmagnet ausgebildet sein, der über eine Versorgungsschleife 9 mit einer Stromquelle, im dargestellten Beispiel mit dem Stromnetz 10 verbunden ist. In die Speicherkammer 5 mündet eine Versorgungsleitung 11, über die das Gleitmittel mit dem gewünschten Druck in die Speicherkammer 5 eingespeist wird. Hierzu ist die Versorgungsleitung 11 mit einer nicht näher dargestellten Druckquelle, beispielsweise einer Ölpumpe, verbunden.The illustrated coating apparatus includes a plurality of over the Width of the substrate to be coated, in this case the metal sheet 1, arranged spray valves 4. These each contain, as best of Figure 2 can be seen, a spray head 4a with a storage chamber 5, in which the lubricant used, in the example shown, under Pressure is present and conical from one to its output narrowing nozzle opening 6 goes off, the effective opening cross-section 7 is variable by means of an adjustable closure member. To form the closure member 7 is here one with a conical Tip provided in the nozzle opening 6 engaging nozzle needle, the by means of a suitably designed as a linear motor Drive device 8 within its Einstellfeldes, all positions between completely closed and fully open, in the axial direction is movable. The above-mentioned linear motor can be used as a solenoid be formed, which via a supply loop 9 with a Power source, in the example shown connected to the power grid 10 is. In the storage chamber 5 opens a supply line 11, via the lubricant with the desired pressure in the storage chamber. 5 is fed. For this purpose, the supply line 11 is not one closer illustrated pressure source, such as an oil pump, connected.

Zum Versprühen des Gleitmittels findet im dargestellten Beispiel Sprühluft Verwendung. Hierzu ist ein die dem Gleitmittel zugeordnete Düsenöffnung 6 konzentrisch umfassende Luftaustrittsöffnung 12 vorgesehen, die von einer Druckkammer 13 abgeht, die über an eine nicht näher dargestellte Druckluftquelle angeschlossene Versorgungsleitung 14 mit Druckluft beaufschlagbar ist. In der Versorgungsleitung 14 ist ein Absperrventil 15 vorgesehen, durch das die Luftzufuhr zur Druckkammer 13 und damit zur Luftaustrittsöffnung auf- und absteuerbar ist.For spraying the lubricant takes place in the example shown Spray air use. For this purpose, one associated with the lubricant Nozzle opening 6 concentric air outlet opening 12th provided, which goes off from a pressure chamber 13, which is connected to a not shown compressed air source connected Supply line 14 can be acted upon with compressed air. In the Supply line 14, a shut-off valve 15 is provided, through which the Air supply to the pressure chamber 13 and thus to the air outlet opening on and is deductible.

Um eine auch im Langzeitbetrieb genaue und bedarfsgerechte Beschichtung der Blechtafeln 1 mit Gleitmittel zu bewerkstelligen, wird die Ausflussrate, das heißt der Massedurchsatz durch die Düsenöffnung 6 pro Zeiteinheit, die zusammen mit der Geschwindigkeit des zu beschichtenden Substrats die Beschichtungsdicke ergibt, mittels einer einen geschlossenen Regelkreis enthaltenden, in Figur 2 durch eine strichpunktierte Umrandung angedeutete Regelungseinrichtung 40 geregelt. Dabei ist jeder Düsenöffnung 6 ein Regler 16 zugeordnet, der einen Sollwert-Eingang 17 für die momentan benötigte Ausflussrate, das heißt für die der momentan unter der Düsenöffnung 6 sich befindenden Stelle des Substrats benötigte Gleitmittelmenge, und einen Istwert-Eingang 18 für den Massedurchsatz durch die Versorgungsleitung 11, der praktisch dem Massedurchsatz durch die Düsenöffnung 6 entspricht, aufweist und der aus der Regelabweichung, das heißt aus der Differenz zwischen Sollwert und Istwert, ein Stellsignal bildet, durch das die das Verschlussorgan 7 bildende Ventilnadel so verstellt wird, dass die Regelabweichung verschwindet.In order to be accurate even in long-term operation and needs-based Coating the metal sheets 1 with lubricant to accomplish is the outflow rate, that is, the mass flow rate through the nozzle opening. 6 per unit time, which together with the speed of the too Coating substrate results in the coating thickness, by means of a a closed loop containing, in Figure 2 by a dash-dotted outline indicated control device 40 regulated. Each nozzle opening 6 is associated with a controller 16, the a setpoint input 17 for the currently required outflow rate, the means for those currently under the nozzle opening 6 are located Location of the substrate required Gleitmittelmenge, and an actual value input 18 for the mass flow through the supply line 11, the practically corresponds to the mass flow rate through the nozzle opening 6, and that of the control deviation, that is from the difference between setpoint and actual value, forms a control signal, by which the Closing member 7 forming valve needle is adjusted so that the Control deviation disappears.

Hierzu wird der die Antriebseinrichtung 8 bildende Hubmagnet mit mehr oder weniger Strom beaufschlagt. Hierzu ist in der Versorgungsschleife 9 eine Drosseleinrichtung 19 angeordnet, die über eine Signalleitung 20 mit dem Signalausgang des zugeordneten Reglers 16 verbunden ist und durch die in Abhängigkeit von dem vom Regler 16 abgegebenen Signal die Strombeaufschlagung der die Antriebseinrichtung 8 bildenden Hubmagnetanordnung mehr oder weniger gesteigert bzw. gedrosselt werden kann. Zur Bildung des Reglers 16 wird zweckmäßig ein programmierbarer Mikroprozessor verwendet. Mittels des Reglers 16 wird zweckmäßig auch die Luftversorgung auf- und abgesteuert, wie durch eine vom Regler 16 zum Absperrventil 15 führende Signalleitung 21 angedeutet ist. Dabei findet keine Regelung, sondern nur eine Auf- und Absteuerung statt, wobei die Luftbeaufschlagung einsetzt, sobald die Düsenöffnung 6 geöffnet wird und umgekehrt.For this purpose, the lifting device 8 forming the lifting magnet with more or less power applied. For this purpose, in the supply loop 9 a throttle device 19 is arranged, which via a signal line 20 with the signal output of the associated controller 16 is connected and through in response to the output from the controller 16 signal the Current application of the drive device 8 forming Hubmagnetanordnung more or less increased or throttled can be. To form the regulator 16 is appropriate programmable microprocessor used. By means of the regulator 16 becomes expediently the air supply up and down, as by a from the controller 16 to the shut-off valve 15 leading signal line 21 indicated is. There is no regulation, but only an up and down control instead, wherein the air admission begins as soon as the nozzle opening. 6 is opened and vice versa.

Der Sollwert für den Massedurchsatz kommt von einem geeigneten, in Figur 2 durch einen Kreis angedeuteten Sollwert-Steller 22. Der Istwert wird durch einen in Figur 2 lediglich angedeuteten Messfühler 23 aufgenommen. Zur Messung des Massedurchsatzes durch die Versorgungsleitung 11 kann diese, wie aus Figur 3 erkennbar ist, mit einer Venturiblende 24, das heißt mit einer Querschnittsverengung, versehen sein, der eine Druckwaage 25 zugeordnet ist, die ein dem gewünschten Istwert des Massedurchsatzes entsprechendes Ausgangssignal liefert. Mit der Druckwaage 25 werden die Drücke im Bereich der Venturiblende 24 sowie in einem Leitungsabschnitt außerhalb hiervon gemessen. Der Querschnittsunterschied zwischen Venturiblende 24 und der sonstigen Versorgungsleitung 11 führt zu unterschiedlichen Geschwindigkeiten im Bereich der Venturidüse 24 und außerhalb hiervon. Diese unterschiedlichen Geschwindigkeiten führen zu unterschiedlichen Drücken, aus denen sich daher in Verbindung mit dem jeweils zugehörigen Querschnitt die Geschwindigkeit und damit der Massedurchsatz ermitteln lässt.The setpoint for the mass flow rate comes from a suitable, in Figure 2 indicated by a circle setpoint adjuster 22. The actual value is by a in Figure 2 only indicated sensor 23rd added. For measuring the mass flow rate through the Supply line 11 can this, as can be seen from Figure 3, with a Venturiblende 24, that is with a cross-sectional constriction, be provided, which is associated with a pressure compensator 25, the one desired actual value of the mass flow rate corresponding output signal supplies. With the pressure compensator 25, the pressures in the Venturi cap 24 and in a line section outside thereof measured. The cross-sectional difference between Venturiblende 24 and the other supply line 11 leads to different Speeds in the area of the venturi 24 and outside thereof. These different speeds lead to different Press, which therefore in conjunction with the respective associated cross section the speed and thus the mass flow rate can be determined.

Den Reglern 16 aller Sprühventile 4 ist zweckmäßig, wie aus Figur 1 ersichtlich ist, ein gemeinsamer Sollwertsteller 22 zugeordnet, der zweckmäßig über einen durch Signalleitungen angedeuteten Datenbus 26 mit den Reglern 16 aller Sprühventile 4 verbunden ist, die eine hierzu geeignete Schnittstelle enthalten. Der Sollwert-Steller 22 ist zweckmäßig als Rechner ausgebildet, der mit einem Speicher versehen ist, in welchem die gewünschten Schichtdickenwerte im Bereich der den Sprühventilen 4 jeweils zugeordneten Zonen des Substrats gespeichert sind. Dabei kann es sich um Konstantwerte oder um Werte eines Schichtdickenprofils handeln. Zur Eingabe dieser Werte ist der den Sollwert-Steller 22 bildende Rechner mit einer geeigneten Eingabeeinrichtung 22a versehen.The regulators 16 of all spray valves 4 is expedient, as shown in FIG. 1 it can be seen, a common setpoint adjuster 22 assigned, the expediently via a data bus 26 indicated by signal lines is connected to the regulators 16 all spray valves 4, the one for this purpose contain suitable interface. The setpoint adjuster 22 is appropriate formed as a computer, which is provided with a memory in which the desired layer thickness values in the area of the spray valves 4 respectively associated zones of the substrate are stored. It can constant values or values of a layer thickness profile act. To enter these values is the setpoint adjuster 22 forming Computer provided with a suitable input device 22a.

Der den Sollwert-Steller 22 bildende Rechner ist mit Sensoren zur Bestimmung der Position des Substrats relativ zu den Sprühventilen 6 gekoppelt. Hierzu ist eine mit der der Transporteinrichtung 2 zugeordneten Antriebseinrichtung 3 zusammenwirkende Inkrementaleinrichtung 28 vorgesehen, die bei jedem, einem gewissen Drehwinkel entsprechenden Schritt ein Signal erzeugt und deren Ausgang an einem zugeordneten Eingang 27 des Sollwert-Stellers 22 liegt. Der diesen bildende Rechner kann aus der Anzahl der Signale die Transportstrecke und aus der Anzahl der Signale pro Zeiteinheit die Geschwindigkeit der Blechtafeln 1 berechnen. Die Berechnung wird mittels eines die Vorderkante der Blechtafeln 1 abtastenden Sensors 29, der beispielsweise als Lichtschranke ausgebildet sein kann, gestartet, dessen Ausgang mit einem geeigneten Eingang 30 des den Sollwert-Steller 22 bildenden Rechners verbunden ist. Dieser kann dementsprechend die exakte Position der Blechtafeln 1 innerhalb ihres die Sprühdüsen 4 passierenden Wegs und damit die Koordinaten jeder Stelle der Blechtafeln 1 berechnen, die sich unterhalb einer Sprühdüse 4 befindet. Aus diesem Momentanwert und der der betreffenden Stelle zugeordneten Schichtdicke wird vom Sollwert-Steller 22 der Sollwert für die Ausflussrate gebildet.The setpoint adjuster 22 forming computer is equipped with sensors for Determining the position of the substrate relative to the spray valves 6 coupled. For this purpose, one with the transport device. 2 associated drive device 3 cooperating Incremental 28 provided at each, a certain Rotation angle corresponding step generates a signal and its output is located at an associated input 27 of the setpoint adjuster 22. Of the this forming computer can from the number of signals the Transport distance and from the number of signals per unit time the Calculate the speed of the metal sheets 1. The calculation will by means of a sensor 29 scanning the leading edge of the metal sheets 1, which can be configured, for example, as a light barrier, started, its output with a suitable input 30 of the setpoint adjuster 22 forming computer is connected. This can accordingly the exact position of the metal sheets 1 within their the spray nozzles. 4 passing path and thus the coordinates of each position of the metal sheets 1, which is located below a spray nozzle 4. For this Instantaneous value and the layer thickness assigned to the relevant point is formed by the setpoint adjuster 22, the target value for the outflow rate.

Die Sprühventile 4 werden zweckmäßig kurz vor der Öffnung der Düsenöffnung 6 eingeschaltet. Auch dies kann mittels der vom Sensor 29 erzeugten Signale bewerkstelligt werden. Hierzu ist der Sensor 29 einfach um ein bestimmtes Maß vor den Sprühdüsen 4 angeordnet, so dass diese zunächst scharf gestellt und dann mit dem Abstand zum Sensor 29 entsprechender Zeitverzögerung geöffnet werden können.The spray valves 4 are expediently shortly before the opening of the nozzle opening 6 switched on. This can also be done by means of the sensor 29 generated signals are accomplished. For this, the sensor 29 is simple arranged by a certain amount in front of the spray nozzles 4, so that these first focused and then with the distance to the sensor 29 corresponding time delay can be opened.

Um die Regelung der Ausflussrate zu vereinfachen und eine hohe Funktionssicherheit zu gewährleisten, wird die Temperatur des den Sprühventilen 4 zugeführten Gleitmittels auf einem gewünschten Niveau konstant gehalten, wodurch sich eine konstante Viskosität ergibt. Hierzu ist den Sprühköpfen 4a der Sprühventile 4 sowie dem sprühkopfnahen Bereich der Versorgungsleitung 11 eine hier durch eine elektrische Heizwendel gebildete Heizeinrichtung 31 zugeordnet, die über eine Versorgungsschleife 32 mit einer Stromquelle, beispielsweise dem installierten Stormnetz, verbunden ist. In der Versorgungsschleife 32 ist eine Drosseleinrichtung 33 angeordnet, die durch den zugeordneten Regler 16 beeinflussbar ist. Dieser ist mit einem Sollwert-Eingang 34 für einen Temperatur-Sollwert sowie einem Istwert-Eingang 35 für den Istwert der Temperatur des der Sprühdüse 4 zugeführten Gleitmittels versehen. Der Istwert der Temperatur wird mittels eines Temperaturfühlers 36 aufgenommen. Dieser kann zur Erzielung einer kompakten Anordnung in die der Figur 3 zugrundeliegende Messvorrichtung zur Messung des Massedurchsatzes integriert sein.To simplify the control of the discharge rate and a high To ensure functional safety, the temperature of the Spray valves 4 supplied lubricant at a desired level held constant, resulting in a constant viscosity. For this is the spray heads 4a of the spray valves 4 and the near the spray head Area of the supply line 11 a here by an electrical Heating coil formed heater 31 associated with, which has a Supply loop 32 with a power source, such as the installed storm network, is connected. In the supply loop 32 is a throttle device 33 arranged by the associated Regulator 16 can be influenced. This is with a setpoint input 34 for a temperature setpoint and an actual value input 35 for the actual value the temperature of the spray nozzle 4 supplied lubricant provided. The actual value of the temperature is determined by means of a temperature sensor 36 added. This can be done to achieve a compact arrangement in 3 of the underlying measuring device for measuring the Mass flow rate to be integrated.

In der Regel genügt es, wenn die Temperatur des Beschichtungsmittels konstant gehalten wird. Hierzu wird dem Regler 16 über den Eingang 24 ein konstanter Temperatur-Sollwert vorgegeben. Dieser kann ebenfalls im gemeinsamen Sollwert-Steller 22 abgelegt sein und von diesem für alle Sprühventile 4 ausgeben und mittels des Datenbusses 26 übertragen werden. Es ist aber auch denkbar, den Temperatur-Sollwert mittels des Sollwert-Stellers 22 zu variieren, um hiermit die Ausflussrate zusätzlich zur Stellung der das Verschlussorgan 7 bildenden Ventilnadel zu variieren. Der gemeinsame Sollwert-Steller 22 benötigt in jedem Fall einen Speicher für die Temperatursollwerte und im Falle einer Variation dieser Sollwerte ein hierfür geeignetes Programm.In general, it is sufficient if the temperature of the coating composition is kept constant. For this purpose, the controller 16 via the input 24th a constant temperature setpoint specified. This can also be in the common setpoint adjuster 22 be stored and of this for all Issue spray valves 4 and transmitted by the data bus 26 become. But it is also conceivable, the temperature setpoint by means of Setpoint adjuster 22 to vary, thereby adding the outflow rate in addition to the position of the closure member 7 forming valve needle vary. The common setpoint adjuster 22 requires one in each case Memory for the temperature setpoints and in case of a variation of these Setpoints a program suitable for this purpose.

Um eine laufende Sichtkontrolle des Beschichtungsvorgangs zu ermöglichen werden die im Bereich sämtlicher Sprühventile 4 vorhandenen Istwerte sowie die zugehörigen Sollwerte und vorzugsweise die hieraus gebildeten Regelabweichungen, das heißt die Differenzen zwischen Soll- und Istwert angezeigt. Diese Werte werden von den Reglern 16 der Sprühventile 4 geliefert, wie in Figur 2 durch einen Datenausgang 37 angedeutet ist. Die Anzeige kann auf den einzelnen Sprühventilen 4 jeweils zugeordneten Anzeigeeinrichtungen erfolgen. Bei dem der Figur 1 zugrundeliegenden Beispiel ist der den Sollwert-Steller 22 bildende, zentrale Rechner mit einer zentralen Anzeigeeinrichtung 38 versehen, die über den Datenbus 26 mit den Werten der einzelnen Regler 16 versorgt werden kann. Um eine eventuell notwendig werdende, spätere Fehlersuche zu erleichtern ist parallel zur Anzeigeeinrichtung 38 eine Aufzeichnungseinrichtung 39 vorgesehen, durch die die angezeigten Werte laufende protokolliert werden. Auch hier gilt, dass jedem Sprühventil 4 eine eigene Aufzeichnungseinrichtung zugeordnet sein kann, wogegen im dargestellten Beispiel eine dem den Sollwert-Steller 22 bildenden Zentralrechner zugeordnete, gemeinsame Aufzeichnungseinrichtung 39 vorgesehen ist. Die Aufzeichnungseinrichtung 39 könnte aber auch Teil einer noch weiter übergeordneten Prozessleitsteuerung sein.For an ongoing visual inspection of the coating process will allow those in the field of all spray valves 4 existing actual values and the associated setpoints and preferably the resulting deviations, that is, the differences between setpoint and actual value is displayed. These values are taken from the controllers 16 of the spray valves 4 as shown in Figure 2 by a data output 37 is indicated. The display can on the individual spray valves. 4 respectively assigned display devices take place. In the figure 1 underlying example is the setpoint adjuster 22 forming, central computer provided with a central display device 38, the supplied via the data bus 26 with the values of the individual controller 16 can be. To a possibly necessary, later To facilitate troubleshooting is parallel to the display device 38 a Recording device 39 provided by the displayed values running be logged. Again, that each spray valve 4 a separate recording device can be assigned, whereas in illustrated example, a the setpoint adjuster 22 forming the central computer associated common recording device 39 is provided. The recording device 39 could also be part be an even higher-level process control.

Die in Figur 2 durch eine strichpunktierte Linie umgrenzte Regelungseinrichtung 40 ist zweckmäßig, wie in Figur 1 angedeutet ist, in das zugeordnete Sprühventil 4 integriert. Dieses enthält dementsprechend neben dem die Düsenöffnung 6 enthaltenden Sprühkopf 4a und der der Düsennadel zugeordneten Antriebseinrichtung auch die komplette Regeleinrichtung 40 zur Regelung der Ausflussrate und gegebenenfalls der Temperatur. Die Sprühventile 4 bilden dementsprechend jeweils eine komplett vormontierte, anschlussfertige Baueinheit, die lediglich an die Versorgungsleitung 11 zur Zufuhr des Beschichtungsmediums, an die Druckluftleitung 14 zur Zufuhr von Sprühluft sowie an die Stromquelle 10 zur Stromversorgung und an den Datenbus 26 zur Bewerkstelligung eines Datenflusses von und zu dem den Sollwert-Steller 22 bildenden Zentralrechner angeschlossen werden müssen. Dies erleichtert auch die Wartung und Instandhaltung, da derartige Baueinheiten einfach komplett ausgetauscht werden können.The circumscribed in Figure 2 by a dashed line Control device 40 is expedient, as indicated in Figure 1, in the associated spray valve 4 integrated. This contains accordingly in addition to the nozzle opening 6 containing spray head 4a and the Nozzle needle associated drive device and the complete Control device 40 for controlling the outflow rate and possibly the Temperature. The spray valves 4 accordingly each form one completely pre-assembled, ready-to-connect unit, only to the Supply line 11 for supplying the coating medium to which Compressed air line 14 for the supply of spray air and to the power source 10th to the power supply and to the data bus 26 to accomplish a Data flow from and to the setpoint adjuster 22 forming Central computer must be connected. This also facilitates the Maintenance and servicing, since such units are simply complete can be exchanged.

Claims (16)

Vorrichtung zum Auftragen eines Beschichtungsmittels auf ein Substrat, insbesondere zum Auftragen eines Gleitmittels auf einer Tiefziehpresse zuführbare Blech, mit wenigstens einem eine mittels eines Verschlussorgans (7), das mittels einer zugeordneten Positioniereinrichtung positionierbar ist, hinsichtlich ihrer wirksamen Austrittsfläche veränderbare Düsenöffnung (6) aufweisenden Sprühventil (4), an dem das Substrat vorbeibewegbar ist und dem das Beschichtungsmittel über eine Versorgungsleitung (11) mit Druck zuführbar ist, dadurch gekennzeichnet, dass das Verschlussorgan (7) mittels der zugeordneten Positioniereinrichtung permanent innerhalb eines vorgegebenen Einstellfelds einstellbar ist, wobei der Positioniereinrichtung ein Regler (16) zugeordnet ist, der zumindest einen Sollwert-Eingang (17) für die momentan benötigte Ausflussrate des Beschichtungsmittels aus dem Sprühventil (4) und wenigstens einen Istwert-Eingang (18) für den Massendurchsatz durch einen der Düsenöffnung (6) vorgeordneten Versorgungsabschnitt aufweist und der aus der Regelabweichung ein die Positioniereinrichtung im Sinne einer Aufhebung der Regelabweichung beeinflussendes Stellsignal bildet.Apparatus for applying a coating agent to a substrate, in particular for applying a lubricant on a deep drawing press sheet, with at least one by means of a closure member (7), which is positionable by means of an associated positioning, with respect to their effective exit surface variable nozzle opening (6) having spray valve (4), on which the substrate can be moved past and to which the coating agent can be supplied with pressure via a supply line (11), characterized in that the closure member (7) is permanently adjustable within a predetermined setting field by means of the associated positioning device, wherein the positioning device Associated with the controller (16), the at least one setpoint input (17) for the currently required outflow rate of the coating agent from the spray valve (4) and at least one actual value input (18) for the mass flow rate through one of the Düsenö Opening (6) upstream supply section and which forms from the control deviation a positioning signal influencing the positioning in the sense of a cancellation of the control deviation. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Sollwert in Abhängigkeit von einem über der in Transportrichtung verlaufenden Länge des Substrats (1) erwünschten Beschichtungsdickenprofil einstellbar ist. Apparatus according to claim 1, characterized in that the desired value in dependence on a desired over the length of the substrate in the transport direction of the substrate (1) desired coating thickness profile is adjustable. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Position des Substrats (1) innerhalb seines das Sprühventil (4) passierenden Wegs mittels einer Wegmesseinrichtung (28, 29) erfassbar ist, deren Ausgang am Eingang eines als Rechner ausgebildeten Sollwert-Stellers (22) liegt, in welchem die gewünschte Schichtdicke, vorzugsweise in Form eines Schichtdickenprofils, gespeichert ist und der aus dem Momentanwert der Position des Substrats (1) und der dieser Position zugeordneten Schichtdicke den Sollwert für die Ausflussrate bildet.Device according to one of the preceding claims, characterized in that the position of the substrate (1) within its the spray valve (4) passing path by means of a displacement measuring device (28, 29) is detectable, whose output at the input of a designed as a computer setpoint adjuster ( 22), in which the desired layer thickness, preferably in the form of a layer thickness profile, is stored and which forms the desired value for the outflow rate from the instantaneous value of the position of the substrate (1) and the layer thickness assigned to this position. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Wegmesseinrichtung (28, 29) der das Substrat (1) am Sprühventil (4) vorbeitransportierenden Transporteinrichtung (2) zugeordnet ist.Apparatus according to claim 3, characterized in that the displacement measuring device (28, 29) of the substrate (1) on the spray valve (4) is transported before transporting means (2). Vorrichtung nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass der Beginn der Wegmessung vom Substrat aktivierbar ist und dass die ein- und ausschaltbaren Einrichtungen des Sprühventils (4) vom Sollwert-Steller (22) mit Vorlauf zur Öffnung der Düsenöffnung (6) ein- und ausschaltbar sind.Apparatus according to claim 3 or 4, characterized in that the beginning of the distance measurement from the substrate is activated and that the on and off switchable devices of the spray valve (4) from the setpoint adjuster (22) with flow to the opening of the nozzle opening (6) a and can be switched off. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Regler (16) einen zusätzlichen Sollwert-Eingang (34) für die gewünschte Temperatur des Beschichtungsmittels und einen zusätzlichen Istwert-Eingang (35) für die Temperatur in einem der Düsenöffnung (6) vorgeordneten Versorgungsabschnitt aufweist und aus der Regelabweichung ein Stellsignal zur Einstellung einer einem der Düsenöffnung (6) vorgeordneten Versorgungsabschnitt zugeordneten Heizeinrichtung (31) bildet.Device according to one of the preceding claims, characterized in that the controller (16) an additional setpoint input (34) for the desired temperature of the coating agent and an additional actual value input (35) for the temperature in one of the nozzle opening (6) upstream Comprises supply section and from the control deviation forms a control signal for setting a one of the nozzle opening (6) upstream supply section associated heating device (31). Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Sprühventil (4) über eine Druckleitung (14) mit Sprühluft zum Versprühen des Beschichtungsmittels beaufschlagbar ist und dass in der Druckleitung (14) ein Ventil (15) angeordnet ist, das mittels des Reglers (16) beim Öffnen der Düsenöffnung (6) einschaltbar ist und umgekehrt.Device according to one of the preceding claims, characterized in that the spray valve (4) via a pressure line (14) with spray air for spraying the coating agent can be acted upon and in the pressure line (14) a valve (15) is arranged, by means of the regulator (16) can be switched on when opening the nozzle opening (6) and vice versa. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass dem Istwert-Eingang (18) ein Massedurchsatz-Messglied vorgeordnet ist, das eine Venturiblende (24) mit zugeordneter Druckwaage (25) aufweist.Device according to one of the preceding claims, characterized in that the input of the actual value (18) is preceded by a mass flow measuring element which has a Venturi diaphragm (24) with associated pressure compensator (25). Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, dass in das Massedurchsatz-Messglied ein Temperaturfühler (36) integriert ist, der dem Istwert-Eingang (35) des Regler (16) vorgeordnet ist.Apparatus according to claim 8, characterized in that in the mass flow rate measuring member, a temperature sensor (36) is integrated, which is upstream of the actual value input (35) of the controller (16). Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Sprühventil (4) einen Sprühkopf (4a) mit einer von einer an die Versorgungsleitung (11) angeschlossenen Speicherkammer (5) abgehenden, konischen Düsenöffnung (6) aufweist, der eine das Verschlussorgan (7) bildende Ventilnadel zugeordnet ist, die mittels einer die Positioniereinrichtung bildenden, durch den Regler (16) regelbaren Antriebseinrichtung (8) axial bewegbar ist.Device according to one of the preceding claims, characterized in that the spray valve (4) has a spray head (4a) with a conical nozzle opening (6) which leads away from a storage chamber (5) connected to the supply line (11) and which holds the closure member (4a). 7) forming the valve needle is assigned, which is axially movable by means of a positioning device forming, by the controller (16) controllable drive means (8). Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass die Antriebseinrichtung (8) als Linearmotor vorzugsweise in Form einer mit einer mit Strom beaufschlagbaren Spule versehenen Hubmagnetanordnung ausgebildet ist, wobei die Stormzufuhr zur Spule mittels des Reglers (16) regelbar ist.Apparatus according to claim 10, characterized in that the drive device (8) is designed as a linear motor, preferably in the form of a provided with a current-powered coil Hubmagnetanordnung, wherein the current supply to the coil by means of the regulator (16) is controllable. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Regler (16) als programmierbarer Mikroprozessor ausgebildet ist. Device according to one of the preceding claims, characterized in that the controller (16) is designed as a programmable microprocessor. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine Anzeigeeinrichtung (38) und/oder eine Aufzeichnungseinrichtung (39) zur Anzeige und/oder Aufzeichnung der Regelabweichungen und/oder derenKomponenten in Form der der tatsächlichen Ausflussraten und der zugehörigen Sollwerte vorgesehen ist bzw. sind.Device according to one of the preceding claims, characterized in that a display device (38) and / or a recording device (39) is provided for displaying and / or recording the control deviations and / or their components in the form of the actual outflow rates and the associated setpoint values. are. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Sprühventil (4) mit einer integrierten, den Regler (16) enthaltenden Regeleinrichtung (40) versehen ist.Device according to one of the preceding claims, characterized in that the spray valve (4) with an integrated, the controller (16) containing control device (40) is provided. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass über der Breite des Substrats (1) mehrere, jeweils mittels eines Reglers (16) regelbare Sprühveritile (4) vorgesehen sind und dass die Regler (16) aller Sprühventile (4) mit einem gemeinsamen Sollwert-Steller (22) verbunden sind, der als Rechner ausgebildet ist und wenigstens einen Speicher aufweist, in welchem die Schichtdickenwerte der den Sprühventilen (4) zugeordneten Zonen und gegebenenfalls die Temperatur des Beschichtungsmittels gespeichert sind und der die Sollwerte für alle Sprühventile (4) bildet.Device according to one of the preceding claims, characterized in that over the width of the substrate (1) a plurality, each controllable by means of a regulator (16) Sprühveritile (4) are provided and that the controller (16) of all spray valves (4) with a common Setpoint adjuster (22) are formed, which is designed as a computer and has at least one memory in which the layer thickness values of the spray valves (4) associated zones and optionally the temperature of the coating agent are stored and the setpoints for all spray valves (4) forms. Vorrichtung nach Anspruch 15, dadurch gekennzeichnet, dass der Sollwertsteller (22) über einen Datenbus (26) mit den Reglern (16) der zugeordneten Sprühventile (4) verbunden ist.Device according to claim 15, characterized in that the set point adjuster (22) is connected via a data bus (26), with the knobs (16) of the associated spray valves (4).
EP03019218A 2002-08-28 2003-08-26 Device for applying coating material Expired - Lifetime EP1393817B1 (en)

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US20040163589A1 (en) 2004-08-26
ATE484342T1 (en) 2010-10-15
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EP1393817B1 (en) 2010-10-13
US7018476B2 (en) 2006-03-28
DE50313172D1 (en) 2010-11-25
DE10239351B4 (en) 2006-07-27

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