JPS62502321A - Alignment and clamp device for two pipe bodies to be welded - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Manual for aligning and clamping the two pipe bodies to be welded The present invention aligns two base materials to be welded having a circular hole with each other and clamps them together. It is a device that has a clamp for each base material on both sides of the welding area that receives the supply of inert gas. a lamp unit, the clamp unit having at least one row of clamps in the circumferential direction; Provided in the lamp groove, the flat part of this clamp groove may be close to or separated from each other in the axial direction. This tightens outward and relaxes inward in the radial direction, causing holes in the base material to tighten. with outwardly pointed clamping surfaces in contact with surfaces, separated by a circumferential distance The present invention relates to an aligning and clamping device having a clamping member having a fixed clamp member.

In a known device of this type (West German Patent Publication No. 2,708,040), Each clamping groove is equipped with several specially formed clamping wedges. A clamping wedge supports a clamping shoe on the outer surface opposite the circumference of the pipe. At the same time, this clamping shoe is connected to the inner surface of the pipe to be clamped. They are in contact for the most part. The clamping wedge should be placed in the circumferential direction. It is held within the clamp groove by a plurality of extending tension springs. The clamp groove is , formed by firmly arranged groove walls on the one hand and pressure medium on the other hand. axially against the groove wall to tighten the clamping wedge by filling the It is formed by a hydraulic piston that can be deflected.

The known clamping devices are suitable for laser welding methods and for this purpose the clamping Shoes are relatively susceptible to damage with respect to stresses caused by clamping forces and thermal loads. Although the clamping wedge and clamping shoe of known devices are difficult to - is quite crudely made. This has the disadvantage that the overall structure is relatively heavy. However, heat dissipation is promoted ("Automation J 1977, p. 59)" In addition, it is possible to provide a special cooling path in the clamp shoe (in the US). National Patent Publication No. 4,387,845), it is partially advantageous. It is considered. Another problem is that the clamping shoe is made of large parts. The problem is that it is necessary to completely exhaust the atmospheric air with the inert gas supplied to the welding area. This is what makes it difficult to do so. In known devices, the clamping member The more the deformed pipe surface is shaped into a cylindrical shape, the more accurately the clamp member can be aligned. is intended. However, the smaller the number of clamping members, the more The possibility of precisely aligned movement guidance is limited.

The object of the present invention is to provide a clamping device of the type initially described, which is simple in construction. Yes, to ensure proper cooling and to ensure oxygen exclusion with moderate inert gas consumption. To provide a clamping device that can be applied variably and reliably, with the aim of It is.

The solution according to the invention consists of a large number of clamping members aligned at a short distance apart. where the axial dimension of is larger than the width of its clamping surface in the circumferential direction. be.

Unlike previous design principles, each clamping member consists of a small number of large parts. Rather, it is composed of many small parts. These extend only slightly circumferentially In particular, since the contact surface with the inner surface of the pipe is small in the circumferential direction, introduced into it from the welding area on the one hand and from the inner surface of the pipe as thermal stresses on the other hand. The axial dimension of the clamp member is relatively large, and therefore the large cooling Since the cooling surface is obtained, the cooling effect is compared to that of inert gas, which is obtained in a very concentrated manner. can be kept small. When removing oxygen from the atmosphere with inert gas In this case, the small clamping member does not act as an obstruction and is In combination with the small cross-sectional area of the passage located between them, it creates a rather uniform throttling resistance. The size of the clamping member is small, as it promotes the elimination of oxygen evenly by using As a result, it prevents the formation of pockets where atmospheric oxygen remains, and also prevents water washing. Avoid obstacles that impede flushing operations. can. At the same time, as a result of the production of inert gas, the clamping parts are evenly cooled Not only that, but the inner surface of the pipe is also cooled.

Since the dimensions of the clamping member are small in the circumferential direction, its shape in the radial direction is Because it can be made smaller, the surface of the holder that supports it is closer to the inner surface of the pipe. The cooling effect is influenced in a favorable manner.

The clamping surface of the clamping member is essentially a penct iform. is advantageous, and this is achieved by the arched outer surface of the latter.

This reduces heat transfer from the inner surface of the pipe to the clamping member. Therefore, the possibility of the latter overheating can be reduced. of the present invention In a particularly preferred embodiment, the rows of clamping members are in each case approximately longitudinal It is formed by a spring having a plurality of disks or coils arranged in a direction. child Meander springs are also suitable for this purpose, but simple A helical spring is primarily suitable. The helical spring is attached to the guide surface of the clamp groove and the Works with the inner surface of the body. Equipped with clearly defined guide surfaces and clamping surfaces. It has been found to be particularly advantageous as it is a simple and inexpensive component. in addition, By fitting it into the holding body from the outside, it is easy to assemble and replace. I can do it. Its point-like contact surface with the inner surface of the pipe prevents it from overheating. It also provides a wide cooling area for inert gas. small At the coil spacing, the cross section of each passage acts as a fluid resistance, resulting in Throttled, and needless to say completely homogeneous, inert gas production (thr oaghpUt) is achieved. The clamping surface that cooperates with the inner surface of the pipe is small. Because particles are easily pushed away due to the elasticity of the spring coil when tightening, Problems caused by particle adhesion rarely occur. Clamp part formed by coil Due to the large number of materials, they act statistically completely uniformly, so the deformed pipe Even the cross section of can be exceptionally circular.

, a major advantage of the present invention is that replacing the springs is easy even in the location where they are used. It's about being easy. This applies not only to damage, but also to the circumference of the base material. springs with different coil diameters can be used to compensate for orientation tolerances. I have to. Therefore, for example, the diameter range for which a particular device is suitable It can be expanded by using it. The base material only contacts the spring material of which it is made. If so, it is advisable to change the spring.

However, other embodiments of the clamping member, e.g. no spacing or slight spacing. Also suitable is the form of a disc aligned with the spring line. essential without spacing Balls aligned with They can also be used, although they may create a path between the balls. Clamp part The use of balls as material itself means that there are large intermediate intervals around the circumference, and the number is Although relatively rare, it is publicly known (West German Patent Specification No. 3,233°796) .

On the other hand, the aim is to distribute the cross-section of the passage as uniformly as possible over the entire circumference. However, the throttling effect of the inert gas is accompanied by a pressure drop that makes it more difficult for atmospheric oxygen to penetrate. In general, it can be said that the width of the intermediate interval is small enough to be achieved. intermediate interval The width of the clamp member is generally smaller than the circumferential width of the clamp member. Use a spiral spring For example, the coil is apparently contradictory on the inside.

According to another feature of the invention, the groove wall facing the welding area is such that the clamping member It is constructed so that it protrudes in the radial direction to the extent that it is widely obstructed. For this reason In this case, the outer diameter is only a few percent smaller than the clearance diameter of the hole in the base material. Ru.

At least one of the two clamping units clamps the section of pipe to be clamped. In order to not only align but also to orient the It is advantageous to have two rows of clamping elements.

Form the clamp groove and the groove root of this clamp groove at the same time. Consists of a ring that is partially displaceable and sits on a holding body connected by a sleeve. This makes the configuration particularly simple. Groove walls belonging to the same clamp unit are It can be freely displaced from the holding body due to movement.

On the other hand, the groove wall belonging to another clamping unit is firmly arranged in the holding body, The latter is conveniently located in the path of the drive force, so that both clamping units can be Only one drive movement is sufficient for driving. Yet another feature of the invention According to Can be operated separately. This applies to all clamps on the two clamp units. The lamp grooves are connected one after another to the driving force, and the springs that react to the driving force are It is installed parallel to the clamp groove of one of the clamp units. Therefore, it can be achieved. With this spring, when the drive is initially applied, the The applied clamp unit remains temporarily released from the driving force, so other clamps cannot Only the pump unit can be tightened. This allows you to Easily clamp one of the two workpieces to be clamped, and then clamp the other workpiece later. By applying the driving force slowly so that the two clamping units , can be activated gradually. The pressure medium is filled using a drive device. If so, it is sufficient to tighten one clamp unit, but the other clamp An average effective pressure that is insufficiently large to overcome the spring force assigned to the lamp unit. A switching device is provided to operate the drive device, and the clamp device is connected to the two clamps. It can be provided that only one of the means is activated.

For better cooling, a refrigerant circuit for the holder can be provided.

The same pressure medium drive is used for both clamping units, so that According to the invention, as the pressure medium of the drive device, since the consumption of An inert gas can be used, and by using an inert gas, the driving cylinder If a leak occurs from the weld, damage will not occur as a result of the external pressure medium flowing to the weld. It also makes the equipment lighter and simpler by saving on further media supply. It has the advantage of being able to

The invention will now be described in detail with reference to the accompanying drawings, which show advantageous exemplary embodiments. .

1 to 3 show longitudinal sections through three different embodiments of the device.

Figure 4 is an enlarged perspective view from the radial direction toward the clamp groove and the spring inside it. It is a diagram.

FIG. 5 is a sectional view of the configuration according to FIG. 4, viewed in the circumferential direction.

FIG. 6 is a side view of the disk-shaped clamp member.

The clamping device shown in Figure 1 securely holds the vibrator ends 1.2 together. Clamp for exact match at the joint, thereby allowing automatic circumferential welding It is used so that it can be welded from the outside without any problems. as an important field of application It is essential to precisely match the pipe walls to avoid awkward shoulders and steps. One example is the ever-important field of manufacturing pneumatic supply pipes.

The piston 4 is firmly arranged on the piston rod 6 and is located inside the cylinder 15. The cylinder chamber 17 is closed together with the end wall 16.

Circumferentially, the piston 4 is sealed against the cylinder 15 by a seal 5. It is. The cylinder wall 16 has a piston rod 6 displaceable therein. and is sealed by a seal 12.

The other end of the cylinder 15 is connected to a disk 18 having a guide boss 19 on the piston rod 6. is blocked.

The piston rod has a cylindrical shape, with the left end being a closed end and the right end being an open end. drawing Above, it is located on the piston rod, just to the left of piston 7, and creates a clamping device. A pipe 20 connects the hollow part to the open lower part which fills the working chamber 17 with the pressure medium to be moved. being guided.

In the drawing, a holder 21 is provided on the left side of the piston cylinder device, This holding body 2j is essentially configured as a hollow cylinder, and It is freely displaceable in the axial direction, and the right end is inserted through the sealing and guiding sleeve 12a, and At a distance from there, the pin is inserted through a pair of guide and sealing sleeves 12b. It is mounted coaxially on the stone rod 6. Inside the holding body, a sealing sleeve 12 a and 12b are the refrigerant supply pipe 23 and the refrigerant discharge pipe arranged in the hollow space of the piston rod 6. It surrounds a refrigerant chamber 22 through which a refrigerant, for example water, flows via an outlet pipe 24.

A pair of sealing and guiding sleeves 12b are connected to each other through one or more holes 26. It surrounds an annular chamber 25 communicating with the hollow part of the stone rod 6. In addition, the annular chamber 2 5, it is formed on the outer periphery of the holding body and has a tension ring to even out the inflow. A plurality of holes 27 extend radially into an annular chamber 28 that houses a perforated plate 29. ing. When the hollow part of the piston rod is filled with inert gas, this inert gas flows into hole 2. 6.27 to the welding site 9.

On both sides of the annular chamber 28, two annular projections 30, 31 extend on the cylindrical surface of the holder. rises up and forms a conical flat part on the side facing away from the annular chamber are doing. In each case, the cylindrical part adjoins the conical flat part.

A plate 32 having a collar 33 is seated on the left end of the piston rod 6. are gripping the left cylindrical portion of the holding body 21 while also gripping the annular projection 30. Forms a conical flat part that is located on the opposite side of the conical flat part and slopes in the opposite direction. are doing. The two flat parts surround the clamp groove 36 that accommodates the helical spring 3. The spring 3 is closed in an annular shape and has a minimum circumference (minimum peri Apply tension in advance so that it always moves to the position of I'm being kicked. The coils of this spring constitute the clamping member and are essentially interconnected. is in contact with.

On the other side of the annular chamber 28, a sleeve 40 is movably mounted on the cylindrical portion of the holder. The sleeve 40 is formed by conical flat portions on both end faces. figure The conical flat part shown on the left side of the plane is the flat part of the annular projection 31 as well as the clamp groove. 36 and surrounds a clamping groove 39 with a helical spring 3. other The flat part is a hollow cylindrical extension part 44 of the cylinder knife 15 that grips the outer periphery of the holding body 21. A clamp for a helical spring 3 whose other side is restrained by a conical flat part placed on the This serves to form the groove 42.

Compression springs 13a and 13b that act in the axial direction serve as centering springs and are connected to the holder 21. between the plate 32 and between the holder 21 and the flange 16 of the cylinder 15. The spring 13a generates a larger compressive force than the spring 13b.

A flexible tube lO is firmly connected to the open right end of the piston rod 6 and is inert. In addition to being used for gas supply, pipes, namely refrigerant pipes 23, 24, and pressure medium If the body is supplied separately, a bundle 11 such as a tube 20 for the latter is stored. .

The clamping groove 36, together with its associated parts, The clamp grooves 39 and 42 are connected to the pipe piece l. The devices belonging to the assigned clamp unit are used as follows. relaxing device In the f2 condition, the springs 3 are inside the clamping groove in which they are housed. So Their outer diameter is smaller than the inner diameter of the pipe piece 1.2. Therefore, the equipment It can be brought to a set position so as to be in front of the annular chamber 28.

When the working chamber 17 of the piston-cylinder device 4, 15 is filled with pressure medium, the piston The ton rod 6 moves to the right with respect to the cylinder 15, and as a result, the holder 21 moves in the cylinder. While approaching the under 15, the plate 32° spring 13a and the spring 1 are 3b is compressed from the left end of the piston rod. At the same time, the clamp grooves 39 and 42 are narrow. As a result, the springs in them are shown as dotted lines until they come into contact with the inner circumference of pipe l. This causes the pipe to be forced outward, at least temporarily. The clamping device is aligned and fixed on the inside. At this time, welding Take care that the edge of the pipe piece l is centered at the front of the annular chamber 28. Spring 13 In such a condition, the force a is applied to the clamp formed at the groove 36. If the unit is not yet functional and pipe 2 is still adjustable, select It is. After that, the pressure in the working chamber 17 is increased so that the spring 13a is also compressed. , then narrow the clamp groove 36 of the left clamp unit and tighten the helical spring there. 3 to the position shown by the dotted line until pipe 2 is also cored and clamped. and is pushed outward. At the same time, the spring moves to different positions as shown by the solid and dotted lines. Following from the position, an axial movement is carried out, which mutually clamps the abutment surfaces of the pipes. used to type.

When the clamping device is placed in the clamped state at any time, inert gas is supplied. Atmospheric air is thereby removed from the annular chamber 28 and thus from the welding area. Device is now ready for automatic welding from the outside. Equipment overheats In order to prevent this, the holding part 21 is simultaneously cooled by supplying refrigerant to the refrigerant chamber 22. It will be done.

FIG. 2 shows a clamping device for clamping a pipe piece 50 to a flange 51. No. Components that are the same as those described with reference to FIG. 1 are indicated using the same reference numerals.

Inside the pneumatic cylinder 15 there is a space between the piston 4 and the fixed cylinder wall 16. A working chamber 17 is formed therein. On the left side of the drawing, the piston is A connector that connects to a pressurized gas hose whose supply can be controlled by a device. It is firmly connected to a pipe 34 having a socket 35 for a connector at one end. Also , the piston rod 6 is firmly connected to the piston 4, and as seen from the drawing, the piston rod 6 is firmly connected to the piston 4. It mainly extends to the left side of the ton 4 and is connected to the inside of the pipe 34, and at 7 The operating chamber 17 has an opening for supplying pressurized gas to operate the clamp device at the location shown. It is formed towards.

The cylinder 15 constitutes a locking part for positioning the flange part 51 to be welded. Therefore, it is firmly connected to a plate 37, hereinafter referred to as a locking plate. So It is provided with a cylindrical collar 38 on the side facing away from the cylinder 15. ing. The piston rod 6 is arranged concentrically in the longitudinal direction via a locking plate 37 and a collar 38. You are guided by the guide and can move around freely. One end thereof has a collar 38 It is rigidly connected to a plate 32 that is connected to the base plate 32. The cylindrical holder 21 has two collars 3 3.38 and passes through holes in these collars. Also, some is instead provided by sealing and guiding sleeves 12a, 12b in the bosses of its end walls. It is also possible to guide it longitudinally movably on the piston rod 6. It's a bar It is supported on the base of the collar 38 by the screws 13b.

A cylindrical sleeve 40 is guided on the holding body 21 and the expansion of this sleeve 40 The large end surface forms a conical flat portion. The flat end of the collar 33 is also adjusted accordingly. It has a conical shape and is closed in an annular shape opposite to the conical flat part of the sleeve 40. It surrounds the clamp groove in which the helical spring 3 is disposed, and each coil of the spring 13 The bolt forms a clamp member.

The sleeve 40 is longitudinally movable on the holder 21 and is similarly disposed on the support. The placed sleeve 40' is firmly connected to the support in the axial direction. Ma In addition, the sleeve 40° also has an annular projection 3 having a conical flat portion at its enlarged end. 0.31, one of which is on the opposite side of the sleeve 40 from the flat part. One side surrounds the clamping groove 39 of the helical spring 3, and the other side is a holding groove. Opposite the conical flat part of the axially movable ring 41 provided on the circumference of the body 21, A clamping groove 42 for the rotary spring 3 is formed together with the ring 41. as shown When the device is in a relaxed state, a gap is formed between the end face of the collar 38 and the ring 41. be done.

A hole 27 is formed between the annular projection 30.31 in the holder 21 and the sleeve 40''. It is formed. The piston rod 6 also has a hole 26 in the holding body 21. It is formed. An inert gas is also used as a pressurizing medium for the cylinder chamber 17. The welding parts of the vibrator pieces 50, 51 to be clamped together through these holes Flows to 9.

The clamp grooves 36, 39, together with their associated parts, fit into the clamp unit of the pipe piece 50. The clamp groove 42 and related parts constitute a second clamp of the flange portion 51. constitutes a unit.

The device works as follows.

In the relaxed state shown, the pipe piece 50.51 is in the clamping device as shown. Installed. Inert gas is supplied via connection 35 with an initial mean of e.g. 5 bar. When the pressure is applied, the piston rod 6 moves to the right in the drawing, and the pressure is applied to the collar 33. Therefore, the clamp groove 36, the helical spring 3, the sleeve 40, the clamp groove 39, and the Helical spring 3, sleeve 40°, holder 21. to the spring 13b via the cannula 12a. is transmitted, and the spring 13b behaves firmly in practice under this moderate pressure. or compressed further than corresponds to the size of the gap between parts 38.40. Its dimensions are determined to prevent this from happening. This is because this pressure limit Until the end, only the helical spring in the clamping groove 36°39 determines the direction of the pipe piece 50. The latter is forced outwardly by the conical flat part in order to tighten and clamp it. So Therefore, the end face of this pipe piece to be welded is a welded part surrounded by annular projections 30, 31. Be careful to align the position exactly with the center of the position. Then, increase the pressure further and 14 (sic) is compressed. Then, the flange 51 becomes a pipe piece. 50 in the sense that it is pressed against the pipe piece 50 that is being clamped at that time. Relative movement in the axial direction occurs between the stop plate 37 and the stop plate 37. The gap next to ring 41 is overcome Immediately, the ring 41 acts on the collar 38 and the helical spring 3 in the clamp groove 42 are forced outward, and as a result, the flanges 51 are aligned and clamped. It will be done.

At the end of this operation, the pipe pieces 50.51 are aligned and their end faces are clamped. They are in contact with each other due to the pressure action, and an inert gas washes them out.

This device is exceptionally simple in construction and uses the simplest control means to control inert gases. It is clear that it can be operated as a welding clamp device just by using it as a control medium. It is clear. Further, the helical spring 3 close to the welding part 9 is attached to the annular projection 30.31. It is more shielded from the welding area and can be widely incorporated into cold parts of clamping equipment. Furthermore, the uniform flow of inert gas provides good cooling, and on the other hand, It can be seen that the heat from the processed pipe piece 50.51 is reduced in the form of points on the contact surface. The heat is only gradually transferred to them.

The device according to FIG. 3 is identical to the device according to FIG. 2, but because of the flange 51. Instead of the only clamping groove 42 provided there for this purpose, two clamping grooves 42.42 are provided. The arrangement of a is rough, and the right vibrator part is just aligned between them. It is movable on the holding body 21 so that the direction is determined so that it is smooth and smooth. It differs in that it has a sleeve. Also, the locking plate 37 is omitted. Ru. Instead, it is made of plastic with a low coefficient of friction and forms a clamping groove. Two sliding rings 43 protrude somewhat radially outward from the annular protrusion. It is provided. This sliding ring is used for clamping equipment inside closed pipelines. This makes it easy to move the location.

The spring 13b is arranged on the side of the holder 21, and that side is opposite to the cylinder 15. facing the opposite side. This allows the clamp groove to be far away from the cylinder 15. 36. The clamp unit to which 39 belongs is close to cylinder 15, and the clamp to be clamped later than the clamping unit with groove 42.42a be able to.

Needless to say, this device is suitable for clamping straight pipe sections. It is only doing so. If the vibrator is bent on one side of the weld, it should be on the left side of Figure 3. The Arayara clamp unit has one clamp groove as shown in Figure 1. It must be kept fairly short.

In the diagonal and radial direction from the outside to the inside, and in the circumferential direction, as shown in Fig. 4. FIG. 5 shows a conical flat portion 52 of the clamping groove 36 which constitutes the clamping member. It shows two coils 56 of helical spring 3 held between 53. These are disconnected Since the faces are bent from circular wire, they will appear on the drawing as very small cracks. The clamping surface 54 makes only point contact with the hole surface of the parent material to be clamped. It has a curved surface that is sharply outward. The overall dimensions of these clamping surfaces are through a very small intermediate spacing 57. The inert gas flow 55 flowing between them is smaller than the size of the clamping surface 54. Each coil will encounter a cooling surface that is twice as large. Thereby, the spiral spring carp will be effectively cooled and there will be no risk of overheating.

In FIG. 6, it has a circular shape and is held at a distance 57 by an intermediate disk 61. By using a plurality of diruri 60 which are connected and pulled by five spring wires, It has been shown that similarly effective lamp member arrangements can be made.

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Claims (16)

[Claims] 1. Align the two base materials (1, 2; 50, 51) to be welded that have circular holes with each other. Welding area (9), which is a device for welding and clamping, and is supplied with inert gas. A clamp unit is provided for each base material on both sides of the At least one row of clamp grooves (36, 39, 42) is provided in the direction, and this clamp groove The flat parts (52, 53) of the It tightens outward and relaxes inward, and the outward contact with the hole surface of the base metal occurs first. Clamps having sharp clamping surfaces and spaced circumferentially a distance (57) In the centering and clamping device that has a clamping member (3), it is possible to The axial dimension of a large number of clamp members (56) arranged at a distance (57) is expressed as a circle. It is characterized by being larger than the width of the clamping surface (54) in the circumferential direction. Device. 2. Device according to claim 1, characterized in that the clamping surface (54) is point-like in nature. something that is characterized by something. 3. A device according to claim 1 or 2, wherein the row of clamping members comprises: a plurality of coils (56) or disks, in each case arranged longitudinally; It is characterized in that it is formed by a spring (3) having. 4. Device according to claim 3, characterized in that the row of clamping members comprises a helical spring (3). It is characterized by being formed of. 5. A device according to claim 1 or 2, wherein the row of clamping members comprises: It is formed of disks (60) aligned at slight intervals on the spring wire (59). It is characterized by: 6. A device according to any one of claims 1 to 5, characterized in that the intermediate interval (5 7) is characterized in that the circumferential width of the clamp member (56, 60) is smaller than the width of the clamp member (56, 60). What to do. 7. According to any one of claims 1 to 6, the inert gas ( A surrounding recess (28) is provided for the welding site (9), which receives the supply of Also, the clamp members (56, 60) are held in the recess (2) by the groove walls (30, 31). 8) Characterized by wider shielding. 8. A device according to claim 7, characterized in that at least one The outer diameter of the groove walls (30, 31) is slightly smaller than the clearance diameter of the hole in the base material. A device characterized by having the following characteristics. 9. A device according to any one of claims 1 to 8, comprising at least one The clamping unit has two rows of clamping members separated by an axial distance. something that is a sign. 10. A device according to any one of claims 1 to 9, wherein two adjacent Adjacent groove walls belonging to matched clamp units are connected and maintained by a cannula (40). It is characterized by being seated on a holding body (21). 11. Apparatus according to claim 10, characterized in that the holding body (21) comprises a clamping part. It is characterized by forming the groove root of the clamp groove (36, 39, 42) for storing the material. What to do. 12. A device according to claim 10, belonging to the same clamping unit. The groove wall is characterized in that it is movable together on the holder (21). 13. Device according to claim 10, belonging to various clamping units The groove walls are firmly placed on the holder (21) and are attached to the springs (13a, 13b). The latter, supported at least on one side, is arranged in the path of the driving force. Features. 14. A device according to any one of claims 1 to 13, which is manufactured separately. Only one driving force is now applied to both movable clamp units. As a result, all the clamp grooves of the two clamp units are aligned sequentially with respect to the driving force. Driving force and reaction applied parallel to the clamp groove of either clamp unit The device is characterized in that it is connected to springs (13a, 13b). 15. A device according to any one of claims 1 to 4, comprising a holder (2 1) is characterized in that a refrigerant circuit (22, 23, 24) is provided. 16. A device according to any one of claims 1 to 15, comprising: an inert gas; A device characterized by using gas as a pressurized medium for driving.