US3838825A

US3838825A - Vibrating mill with heat insulating grinding chamber

Info

Publication number: US3838825A
Application number: US00212326A
Authority: US
Inventors: H Haas; G Eichholz
Original assignee: Kloeckner Humboldt Deutz AG
Current assignee: Kloeckner Humboldt Deutz AG
Priority date: 1971-12-27
Filing date: 1971-12-27
Publication date: 1974-10-01
Anticipated expiration: 1991-10-01

Abstract

A vibrating mill is provided with horizontally disposed grinding chambers arranged in vertically spaced parallel relation one above the other and surrounded each by a heat insulating jacket and mounted fixedly as a unit in a vibrating supporting frame. For the purpose of keeping the vibrating stresses away from the heat insulating jackets and for eliminating heat losses as much as possible, the supporting frame is rigidly connected with the outer wall of the grinding chamber by special connecting means made of a material having not only heat insulating properties but also a good mechanical strength at low temperature. The connecting means are arranged in an annular space provided between the exterior wall of said grinding chamber and said supporting frame and extend through the wall of the heat insulating jacket. These connecting means are in part made of hard polytetrafluoroethylene and may also comprise radial distance members made of a ceramic material, quartz glass or a special technical glass of high strength.

Description

United States Patent 1191 Haas et a1.

1 1 VIBRATING MILL WITH HEAT INSULATING GRINDING CHAMBER [75] Inventors: Helmut Haas; Giinter Eichholz, both of Koln, Germany [73] Assignee: Klockner-Humboldt-Deutz Aktiengesellschaft, Koln, Germany [22] Filed: Dec. 27, 1971 [21] Appl. No.: 212,326

Primary Examiner-Al Lawrence Smith Assistant Examiner-Gary L. Smith Attorney, Agent, or Firm-Hill, Gross, Simpson, Van Santen, Steadman, Chiara & Simpson 1 Oct. 1,1974

157 V l ABSTRACT A vibrating mill is provided with horizontally disposed grinding chambers arranged in vertically spaced parallel relation one above the other and surrounded each by a heat insulating jacket and mounted fixedly as a unit in a vibrating supporting frame. For the purpose of keeping the vibrating stresses away from the heat insulating jackets and for eliminating heat losses as much as possible, the supporting frame is rigidly connected with the outer wall of the grinding chamber by special connecting means made of a material having not only heat insulating properties but also a good mechanical strength at low temperature. The connecting means are arranged in an annular space provided between the exterior wall of said grinding chamber and said supporting frame and extend through the wall of the heat insulating jacket. These connecting means are in part made of hard polytetrafluoroethylene and may also comprise radial distance members made of a ceramic material, quartz glass or a special technical glass of high strength.

6 Claims, IZ Drawin g riglii PATENTED BET 1 74 SHEET 10F 6 FIG. 3

PATENTEDBEH 1914 r 3,838,825

SHEEI 50F 6 A FIGH PATENTED BET 1 1974 SHEET 6 0f 6 FIGJZ VIBRATING MILL WITH HEAT INSULATING GRINDING CHAMBER The invention relates to a vibrating mill provided with at least one horizontally disposed longitudinal grinding chamber which is surrounded by an insulating jacket and is secured to a frame which is yieldably mounted and is provided with a vibratory drive.

In vibrating mills whose grinding chamber is sur rounded by an insulating jacket, as is for instance customary in grinding operations during which refrigerants are introduced into the grinding chamber, it is difficult to secure the grinding chamber to the supporting frame. Owing to the low degree of strength of the customary insulating jackets which are employed and which consist, for instance, of polyurethane foam, polystyrol, etc., it is not possible to connect the grind ing chamber by means of the insulating jacket directly with the supporting frame because the high accelerating forces which are produced during the grinding operation would destroy the mentioned insulating materials very quickly when they are used for transmitting the mentioned accelerating forces.

When performing grinding operations at very low temperatures, it is also difficult to connect the grinding chamber with its outer wall to the supporting frame be cause the customary types of steel which are being used do not have a sufficient strength at low temperatures and any special types of steel which have the strength to endure low temperatures are expensive and difficult to work.

It is an object of the invention to provide a vibrating mill with a heat-insulated grinding chamber which on the one hand is provided with a rigid connection between the supporting frame and the grinding chamber, and on the other hand, does not cause any cold losses or at least reduces the same substantially,

In accordance with the invention, a space is provided between the outer wall of the grinding chamber and the supporting frame, and within this space are arranged one or more connecting means having heat insulating properties and which are also of sufficient strength to transmit the accelerating forces from the supporting frame to the grinding chamber. When these connecting means are employed and when, for instance, the distance between the outer wall of the grinding chamber and the supporting frame is substantially as great as the thickness of the insulating jacket, then cold losses" will also be avoided within the range of the connecting means between the grinding chamber and the supporting frame without the necessity of using the insulating jacket as a connecting means between the grinding chamber and the supporting frame.

Another advantage when using the connecting means of the invention is that solely the grinding chamber and the connecting means have to be made of materials which are able to endure low tempertures, while the supporting frame and the associated connecting and tensioning elements may be made of conventional steel. In this manner, it is possible-particularly in connection with vibrating mills in which the grinding chamber is connected only by force-locking connecting means with the supporting frame to employ these vibrating mills subsequently, for instance for low temperature grinding operation because it is only necessary to exchange the grinding chamber, while all other parts of the device may be used as heretofore.

According to one embodiment of the invention, each connecting means may have the form of one part or multiple part band which is placed around the outer wall of the grinding chamber. In this type of connecting means, it is possible in the present-day tubular vibrating mills to employ connecting members which are made of a heat insulating material having sufficient strength and are placed in the form of an annular or collarshaped band at the connecting point on the supporting frame around the grinding tube and which are adapted to be secured force-lockingly in a simple manner by customary clamping rings in suitable recesses provided in the support frame. Depending upon the size of the diameter of the grinding tube, the annular or collar shaped band may be made of a single piece or may be subdivided into a number of pieces in order to facilitate the assembly of the construction. The insulating of the grinding chamber is taken over at these connecting points by the band, while the other parts of the wall of the grinding chamber are surrounded by an insulating jacket of customary insulating material. At the same time, the band serves also the purpose of transmitting the accelerating forces.

It is also an object of the invention that in the event that a band-shaped connecting means is used, a continuous band or a subdivided outer and also an inner band is being used; these two bands being arranged concentrically with respect to one another and being radially spaced, whereby in the annular space between these two bands, circumferentially spaced distance members are inserted which are used for transmitting the accelerating forces. This particular construction has the advantage that owing to the two concentric bands, a sufficient pressure distribution surface is created at the outer wall of the grinding chamber which in the range of the connecting means is able to reduce and compensate the forces acting on the outer wall of the grinding chamber. The arrangement of the distance members between the outer band and the inner band further more creates a crosssection which reduces the heat transmission from the outside to the inside much better than a closed annular band would do. In fact, the insulation at the connecting point is much improved since the possibility exists of connecting the insulating jacket directly with the annular band and one may even place insulating material in the spaces between the individual distance elements which connect the two annular bands with each other.

It is also an object of the invention to make the distance elements of the connecting means of another, preferably a harder material than the outer band and the inner band. This particular construction of the invention has the advantage that between the outer wall of the grinding chamber and the corresponding engaging surface of the supporting frame, relatively large intermediate spaces are formed at the point of connection, so that relatively large spaces are available for the individual distance elements between these two annular bands.

According to a preferred embodiment of the invention, the inner band and the outer band of the connecting means are made of a plastic of high strength and low thermal conductivity, preferably polytetrafluoroethylene (PTFE) or hexafluoropropylene (FEP), while the distance elements therebetween are suitably made of a ceramic material, such as porcelain or quartz glass, or special technical glasses having a high strength, or similar materials. When this is done. one makes use of the advantage that such plastic materials even at a very low temperature still have a certain elasticity, so that surface irregularities in the hard, but in some cases, brittle material of the distance elements are compensated so that any extremely high stressed points in the material are avoided. At the same time, this particular feature avoids the disadvantage that even the elasticity still present at the low temperature in the plastics at the relatively long distance elements may fail to effect a sufflcient clamping connection be tween the grinding chamber and the supporting frame.

In another embodiment of the invention the connecting means comprises a flexible band which extends around the grinding chamber in circumferential direction and is alternately attached to the grinding chamber and also directly to the supporting frame or to a special clamping means attached to the supporting frame, so that so to speak, the flexible band extends zigzagshaped along the annular space formed between the grinding chamber and the supporting frame. In such a construction, one may select for the flexible band a material having a relatively high heat conductivity without risking any substantial cold losses because any possible heat flow in view of the small cross-sectional flexible band and the minor engagement surface at the attachment points on the supporting frame and the outside of the grinding chamber, is very small. In this particular construction, it is advisable to provide the flexible band with a tension means, so that the highest possible tension may be adjusted when the operating temperature is reached under due consideration of the contraction of the flexible band material.

In a modification of this last described construction, it is contemplated to fill the annular space within the range of the flexible band with insulating material. Preferably one employs for this purpose an insulating material having the form of a powder or the form of granulate. This has the advantage that in the event of a breakage of the flexible band, the grinding chamber will not directly hit the supporting frame or the supporting ring but will encounter the cushioning effect of the insulating material, so that a complete destruction of the connecting means is avoided. On the other hand, such a type of insulating material may easily be removed from the annular space for the purpose of making repairs.

According to another embodiment of the invention, the grinding chamber at the connecting point with the supporting frame may be connected rigidly with a connecting element which extends only partially through the thickness of the insulating jacket, and is held by means of a clamping strap or stirrup in the supporting frame, whereby the contact surfaces with the clamping stirrup and the engagement surface of the supporting frame have parts which are partially hollow and are provided with feed and discharge means for a heat carrier. In this manner, it is then possible on the one hand, to limit the temperature losses to a minimum when the insulating jacket is closed around the grinding chamber, whereby the material employed for the insulation may be selected principally under due consideration of its insulating properties, while its strength plays only a subordinate roll. On the other hand, there is provided a rigid connection between the supporting frame and the grinding chamber which assures the transmission of sufficient accelerating forces from the supporting frame directly to the grinding chamber, and of course also a transmission of these forces to the grinding bod ies in the grinding chamber. When the connecting elements in the range of their engaging surfaces are made hollow and are provided with feed and discharge means for a heat carrier, it is possible, for instance to maintain in the grinding chamber a temperature of below 0C by the addition of heat which raises the temperature at the engagement surfaces of the connecting elements so that the strength of the materials used for the connect ing means and for the supporting frame is not adversely affected. This feature makes it possible to employ the foundation frame, the supporting frame and the connecting means of a conventionally constructed vibrating mill unchanged, and when the operation, for instance, is converted to one which requires the addition of refrigerants, it is only necessary to exchange the grinding chamber of this vibrating mill for another one, leaving all other parts the same.

In another preferred embodiment of the invention, the cross-sectional area of the parts of the connecting elements which extend through the insulating jacket is made smaller within the insulating jacket than at the engagement surface with the clamping stirrup and the supporting frame. In such a construction, the heat losses which usually are caused by the rigid connection between the supporting frame and the grinding chamber are reduced to a far-reaching extent.

The invention provides also that the parts of the connecting means which engage the supporting frame are provided with conduits which at their ends are connected with a feed and discharge device for a heat carrier. This arrangement of conduits for the purpose of permitting the passage of a heat carrier does not decrease the required strength of the connecting means in the range of these contact surfaces for transmitting the accelerated forces produced by the vibrating supporting frame and for transmission to the grinding chamber.

In a preferred embodiment of the last mentioned construction of the invention, the conduits in the mentioned parts of the connecting means extend substantially parallel to the longitudinal axis of the grinding chamber. This arrangement produces the shortest possible length of the path for the heat carrier, so that temperature differences of the heat carrier between the inlet of the conduits and the outlet of the conduits remain substantially small.

Since in individual cases, it may happen that along the circumference of the grinding chamber different temperatures may exist, it is advisable to provide the conduits individually or in groups with feed means and discharge means, respectively, for the heat carrier. In this manner it is possible, for instance, to supply the upper portion of the horizontal grinding chamber with a heat carrier which heats this upper portion to a different temperature than the lower portion of the grinding chamber.

In a preferred embodiment of the invention, when the conduits are approximately all parallel to each other, one may connect these conduits alternately on one end and then on the other end with feed means for the heat carrier, so that a counter-flow effect takes place. This has the result that, when viewed in the longitudinal direction of the grinding chamber, a uniform temperature is created in the surface of the connecting means which engages the supporting frame.

According to another feature of the invention, all of the conduits, at least at their discharge end, are connected with each other by a common connecting conduit.

In particular, in such vibrating mills in which the I grinding chamber should have a temperature which lies below the temperature of the environment, the invention provides that the surfaces of the connecting elements which engage the supporting frame are provided with embedded electric resistance heating means.

Finally, the invention provides, at least in one of the clamping stirrups, a thermometer probe which is connected with a regulating means which in turn adjusts the temperature of the heat carrier to a predetermined value.

The invention will now be described with reference to the accompanying drawings which illustrate by way of example a number of embodiments of the vibrating mill of the invention.

FIG. 1 illustrates diagrammatically a tubular vibrating mill provided with two horizontal grinding tubes arranged in spaced parallel relationship one above the other.

FIG. 2 illustrates one embodiment of a connecting means between the supporting frame and one grinding tube in an enlarged scale along the line II-II of FIG. 1.

FIG. 3 illustrates another embodiment of the connecting means likewise in a cross-sectional view similar to FIG. 2.

FIG. 4 illustrates a portion of a longitudinal sectional view of the connecting means illustrated in FIG. 3.

FIG. 5 illustrates in cross-section and in similar mannet as the FIGS. 2 and 3, another connecting means comprising a flexible band.

FIG. 6 illustrates in a longitudinal sectional view along the line VI-VI of FIG. 5, a connecting means provided with an eccentric tensioning device.

FIG. 7 illustrates in a longitudinal sectional view, a connecting means corresponding to FIG. 5 but with another embodiment of a tensioning device.

FIG. 8 is a cross-sectional view of an upper grinding chamber taken along the line VIII-VIII of FIG. 12.

FIG. 9 shows a partiallongitudinal section of the upper grinding chamber substantially along the line IX-IX of FIG. 8.

FIG. 10 is a partial longitudinal sectional view similar to FIG. 9 but illustrates another arrangement of the conduits.

FIG. 11 illustrates diagrammatically a development of an annular body in section; and

FIG. 12 illustrates diagrammatically the arrangement of a temperature-adjusting device on a vibrating mill in accordance with the invention.

The vibrating mill illustrated diagrammatically in FIG. 1 comprises two grinding

tubes

1 and 2 arranged in spaced parallel relation one above the other and secured by clamping stirrups 3 to a supporting frame comprising two brackets 4 connected with each other by a horizontally arranged pipe 5. On the sides of the brackets 4 are attached the posts 6 which by means of intermediate rubber cushions 7 attach the unit consisting of the grinding chambers and the supporting frame to a rigid foundation frame 8. As a result of the rubber cushion 7, the unit comprising the grinding chambers and the supporting frame are vibratorily mounted. In the center between the two parallel and

horizontal grinding tubes

1 and 2, is arranged a vibratory drive whose axis extends parallel to the longitudinal axis of the grinding chambers. This vibratory drive comprises rotatably mounted and preferably adjustably imbalanced weights which are arranged in the interior of the brackets 4 and by a shaft disposed in the connecting pipe 5 are connected with each other. These imbalanced weights are driven by a universal joint shaft 9 driven by a not-illustrated motor.

A vertical feed pipe 10 for the material to be ground is connected to the left-hand end of the upper grinding tube 1. At the other end of the grinding tube 1 and at the lower side thereof is connected a discharge 11 through which the material which. has been ground in the first grinding tube I is conducted by a vertical connecting pipe 12 into the right-hand end of the lower grinding tube 2 for further grinding. The left-hand end of the lower grinding tube 2 is provided with a discharge 13 for the finely ground material which leaves the vibrating mill at this point after it has traveled through both of the grinding tubes; one after the other.

Together with the material to be ground or by means of additional feed apertures, depending upon the particular type of the grinding operation, hot gases but preferably refrigerants-tor instance very cold fluids or gases-are introduced into the vibrating mill.

FIG. 2 illustrates a cross-sectional view of the lefthand portion of the grinding tube 1. along the line IIII of FIG. 1, and one will recognize the connection of the grinding tube 1 with the supporting frame. In this particular instance, the embodiment is provided with a heat-insulating, supporting device. The grinding chamher is formed by an inner grinding tube 15 in which additionally a so-called wearing plate 16 is slidably inserted. The sectional view of FIG. 4 illustrates that the grinding tube on its outside is surrounded by an insulating jacket 30 which, for instance, consists of polyurethane foam, and this insulating material is provided on its outside with a thin sheet metal cover 31 for protection against injuries.

Within the range of the connecting joint formed between the grinding tube 15 and the bracket 4, the grinding tube is provided on its outside with a band 18" which in uniform circumferential spaces is provided with recesses in which substantially radially extending distance members 17 are inserted which have heatinsulating properties. These distance members 17 are made for instance of polytetrafluoroethylene (PTFE) which in addition to a thermal conductivity of only .21 kilocalories per meter, hour and centigrade has also a very high strength at low temperature and also a certain elasticity at this low temperature. A clamping frame 18 is slidably moved in axial direction over the distance member 17 and as shown, this clamping frame 18 is completely closed, but it is also possible to employ a subdivided clamping frame 18. This clamping frame 18 has the effect that the radial members 17 are biased toward the annular band 18" in radial direction in order to catch an expected change in the diameter of the grinding tube 15 upon cooling. A clamping stirrup 3 is applied to the upper half of the clamping frame 18, so that the grinding tube 15 is brought into form-locking connection with the bracket 4 of the supporting frame. The clamping stirrup 3 is held by bolts 19 in its operative position. The spaces extending lengthwise between the individual distance members 17 may be filled with the same insulating material of which the insulating jacket is made, for instance with polyurethane foam. In place of the individual distance members 17, one may also employ a closed annular collar made, for instance, of polytetrafluoroethylene.

The FIGS. 3 and 4 illustrate another embodiment of the connecting means. In these figures, the grinding tube 15 is provided on its outside and the clamping frame on its inside, each with a

grooved band

20 and 21, respectively, and made for instance of PTFE or EPT. The diameters of the grinding tube 15 and the clamping frame 18 are so selected that between the two grooved bands, an annular space is produced. In the oppositely arranged

grooved bands

20 and 21 are slidably inserted the distance members 22 which as shown in FIG. 4 have, for instance, a cylindrical form. These distance members 22 are made also of a material having heat-insulating properties and preferably are also of a harder material than the jacket 30. The elements 22 may be made of ceramic materials, for instance, porcelain, quartz glass or other special technical glasses having a high resistance to pressure.

FIG. 4 also illustrates that there are provided suitably two double rows of such distance members 22 at each joint between the grinding tube and the supporting frame in order to distribute the clamping forces acting on the grinding tube over a surface as large as possible.

FIG. illustrates another embodiment of the invention in which the connecting means between the grind ing tube and the supporting frame 4 or a frame 48 respectively, comprises a flexible band 23 which embraces the grinding tube 15 with tension and, viewed in circumferential direction, is alternately attached to the grinding tube and to the supporting frame, so that the flexible band 23 assumes a zigzag form in the hollow space between the grinding tube and the supporting frame. The attachment of the flexible band 23 is effected in a very simple manner in that the outer circumference of the grinding tube and the inner circumference of the frame 48 are provided with apertured radial lugs 24 in the apertures of which are inserted bolts 25, and then the flexible band 23 is threaded over these bolts 25. The frame 48 may be circumferentially divided into separate elements 48 as shown in FIG. 5. For the purpose of applying tension to one or more points of the flexible band, FIG. 6 illustrates the use of eccentrics 26 which take the place of the bolts 25. When these eccentrics 26 are rotated in the proper direction and are then locked in position, the band 23 may be tensioned in the desired manner.

FIG. 7 illustrates another manner in which the flexible band may be tensioned. The clamping frame 49 is circumferentially subdivided into a number of segments similarily to frame 48 in FIG. 5, and the outer ends 29 of these segments are shaped conically, so that conical rings 27 when pushed in axial direction toward each other by means of a screw 28 engage the conical wall of the tensioning frame 49 and thereby the band 23 is being tensioned.

FIG. 8 illustrates in cross-section a connection of the grinding tube with the supporting frame in an embodiment in which the connecting element is attached to the outside of the grinding tube. The connecting element in FIG. 8 is formed by individual radial elements 32 which are spaced uniformly around the circumference of the grinding tube and are fixedly attached to the same. These radial connecting elements 32 extend through the insulating material 30. The outermost ends of the radial connecting elements 32 are fixedly secured to a wide hollow cylindrical body 33. The distance of the outer surface of this hollow cylindrical body 33 from the outside of the grinding tube is so selected that it is somewhat greater than the thickness of the insulating jacket. The outer surface of the hollow cylindrical body 33 which forms a portion of the connecting element engages with its lower portion a surface 34 a suitably semicircularly shaped recess in the connecting bracket 4 of the supporting frame. The upper half of the hollow cylindrical body 33 is covered by a clamping stirrup 3 and is secured by screws to the bracket 4. The screws comprise preferably neckeddown bolts.

In the relatively thick wall of this hollow cylindrical body 33 are provided conduits 35 which extend parallel to the longitudinal axisof the grinding tube. Through these conduits 35 is conducted a flexible heat carrier whose temperature is so adjusted that the temperature of the engagement surface 34 of the connecting element with the clamping stirrup and the connecting bracket remains within the range within which the clamping stirrup and the connecting bracket retain their strength. This means that when a refrigerantfor instance liquid nitrogenis added to the material to be ground, it will be necessary to conduct through these conduits 35 a heating mediumfor instance, a hot liquid. On the other hand, when a heating agent is introduced into the grinding chamber, a suitable cooling medium must be passed through the conduits 35 in order to maintain a temperature which keeps the material of these parts of the grinding chamber connecting means in good condition.

In accordance with these features, a certain amount of heat will be transmitted by the radial members 32 into the grinding chamber or removed therefrom. The losses of heat which occur in this manner are negligible in view of the construction of the connecting means which combine the grinding chamber with the clamping stirrups.

FIG. 9 illustrates a longitudinal section taken along the line IXIX of FIG. 8, and particularly this section is taken at the upper wall of the grinding tube 1. This FIG. 9 illustrates that a preferred embodiment of the connecting means comprise two rows of connecting members 32 of which the inner ends engage the outer wall of the grinding-tube l5 and the outer ends engage the hollow cylindrical body 33. The conduits 35 for the passage of a flowable heat carrier are arranged parallel to the longitudinal axis of the hollow cylindrical body 33 and are connected on both ends with each other by annular channels 36. One of these annular channels 36 is connected with a feed line 37 and the other annular channel 38 is connected with a discharge line 39 for the heat carrier.

FIG. 10 illustrates a sectional view similar to that of FIG. 8 but shows a different arrangement of the channels for the heat carrier. In this embodiment, the ho]- low cylindrical bodycomprises two

concentric rings

40 and 41 of which the inner ring 40 which is rigidly secured to the outer ends of the radial members 32, has a smooth outer surface, while the outer ring 41 is provided on its inner surface with a helical groove 43.

These two

concentric rings

40, 41 are axially slidably pushed together and then are sealingly connected with each other. One end of the helical channel formed by the groove 43 is connected with a feed line and the other end is connected with the discharge line for the heat carrier.

In order to avoid a temperature drop from the left side toward the right side within the clamping stirrup, it is advantageous when, as shown in the sectional view, in the outer ring 41, two

parallel grooves

42 and 43 in the form of a double helix are provided, whereby one end of the channel formed by the groove 42 is connected with a feed line 37' and the end of the other channel formed by the groove 43 on the opposite side is connected with a feed line 37" for the heat carrier. In this manner, there will be produced over the entire axial length substantial uniform temperature over the engagement surface. The discharge lines are designated by 39 and 39", respectively.

As illustrated in the diagrammatic development of a ring with parallel channels in FIG. 11, they all extend in the axial direction of the ring. The principle shown in FIG. may also be applied when all of the channels are parallel to one another. This is accomplished in that the ends of the channels are alternately connected with one end, then the next channel with the other end with a feed line for the feed carrier.

In the event that a refrigerant is to be introduced into the grinding chamber, one may employ in place of the channels which should contain a heated fluid also an electric resistance heating means. In such a construction, suitable electric resistance rods are arranged parallel to each other or in helical manner in the hollow cylindrical body either by insertion or by casting and then the ends of these resistances are connected to a source of electric current.

FIG. 12 illustrates diagrammatically in what manner a thermometer probe 44for instance a thermo ele' mentis mounted in the clamping stirrups. Such a thermometer probe 44 is connected with an electric adjusting device 45, which is so constructed and adjusted that a predetermined desired temperature will be main tained in the clamping stirrups. Accordingly, the adjusting device cooperates with another device such as a valve 46 or a pump which is arranged in a pipeline leading to a heating or cooling device 47 respectively. If, for instance, the material is ground in the grinding tube at a low temperature, then a heated fluid is used as heat carrier, while in the event that additional heat is introduced into the grinding tube, a cooling agent serves to heat as heat carrier so as to hold the clamping stirrups at a constant temperature.

The principle of the invention is not limited to the disclosed embodiment of the vibrating mill and also is not limited to the described construction of the connecting elements, and the arrangement of the conduits in the same.

What we claim is:

I. A vibratory mill, comprising at least one elongated comminuting member, a heat-insulating jacket surrounding said comminuting member, a frame supportingly connected with said comminuting member, means operatively connected with said frame for imparting vibratory movement to the same, said frame including clamping means surrounding said comminuting member and comprising a first annular band means concentric with said comminuting member and spaced radially outwardly therefrom, a second annular band means concentric with and engaging said comminuting member and a plurality of circumferentially spaced distance members disposed in the annular space between said first annular band means and said comminuting member being supported by said second annular band means and supporting'ly extending between said first annular band means and said comminuting member to support the comminuting member.

2. A vibratory mill according to claim 1, in which said circumferentially spaced distance members are made of a harder material than said concentrically arranged annular bands.

3. A vibratory mill according to claim 1, in which said circumferentially spaced distance members are made of a ceramic material, a quartz glass or a tempered glass having high strength.

4. A vibratory mill, comprising at least one elongated comminuting member, a heat-insulating jacket sur rounding said comminuting member, a frame supportingly connected with said comminuting member, means operatively connected with said frame for imparting vibratory movement to the same, said frame including clamping means surrounding said comminuting member and comprising an annular band member con centric with said comminuting member and spaced therefrom, attachment means secured to the outer wall of said comminuting member, and a flexible and substantially unstretchable band attached at circumferentially spaced points alternately to said annular band member and said attachment means in the annular space formed between said comminuting member and said annular band member.

5. A vibratory mill according to claim 4, including tensioning means connected with said flexible band.

6. A vibratory mill, comprising at least one elongated comminuting member, a heat-insulating jacket surrounding said comminuting member, a frame supportingly connected with said comminuting member, means operatively connected with. said frame for imparting vibratory movement to the same, said frame including an annular band member concentric with said comminuting member and spaced therefrom, band means secured to the outer wall of said comminuting member, and a plurality of circumferentially spaced radially extending distance members engaging on their radial inner ends with the band means on the outer wall of the comminuting member and at the radial outer

Claims

1. A vibratory mill, comprising at least one elongated comminuting member, a heat-insulating jacket surrounding said comminuting member, a frame supportingly connected with said comminuting member, means operatively connected with said frame for imparting vibratory movement to the same, said frame including clamping means surrounding said comminuting member and comprising a first annular band means concentric with said comminuting member and spaced radially outwardly therefrom, a second annular band means concentric with and engaging said comminuting member and a plurality of circumferentially spaced distance members disposed in the annular space between said first annular band means and said comminuting member being supported by said second annular band means and supportingly extending between said first annular band means and said comminuting member to support the comminuting member.

4. A vibratory mill, comprising at least one elongated comminuting member, a heat-insulating jacket surrounding said comminuting member, a frame supportingly connected with said comminuting member, means operatively connected with said frame for imparting vibratory movement to the same, said frame including clamping means surrounding said comminuting member and comprising an annular band member concentric with said comminuting member and spaced therefrom, attachment means secured to the outer wall of said comminuting member, and a flexible and substantially unstretchable band attached at circumferentially spaced points alternately to said annular band member and said attachment means in the annular space formed between said comminuting member and said annular band member.

6. A vibratory mill, comprising at least one elongated comminuting member, a heat-insulating jacket surrounding said comminuting member, a frame supportingly connected with said comminuting member, means operatively connected with said frame for imparting vibratory movement to the same, said frame including an annular band member concentric with said comminuting member and spaced therefrom, band means secured to the outer wall of said comminuting member, and a plurality of circumferentially spaced radially extending distance members engaging on their radial inner ends with the band means on the outer wall of the comminuting member and at the radial outer ends with the band member of the frame, and insulation material in the spaces between said distance members.