EP1984136A1

EP1984136A1 - Clamping device

Info

Publication number: EP1984136A1
Application number: EP07711185A
Authority: EP
Inventors: Guido Merkt
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-02-17
Filing date: 2007-02-12
Publication date: 2008-10-29
Also published as: WO2007093160A1; DE202006002681U1; EA200870269A1; DE112007000971A5

Abstract

Clamping device (10) comprising jaws (11, 12) which are movable in opposition to one another and on which clamping elements can be arranged, characterized in that the jaws (11, 12) each have a cavity in which at least one drive rod (13, 14), drivable by means of a piston (15), can be moved for driving the jaws (11, 12), wherein the direction of movement of the at least one drive rod (13,14) and the direction of movement of the jaws (11, 12) run perpendicularly to one another and/or at angle of between 0° and 90° to one another.

Description

jig

DESCRIPTION

The invention relates to a clamping device with mutually oppositely movable jaws, on which clamping elements can be arranged. In the clamping devices hitherto known from the prior art, the jaws are driven by drive elements which are arranged below the jaws. Due to the arrangement of the drive elements below the jaws, the clamping device requires a relatively large amount of space.

The invention has the object to improve the clamping device of the type mentioned in that future, the required space for the clamping device is reduced.

The invention achieves the stated object by means of a tensioning device of the type mentioned above, in which, according to the invention, the jaws each have a cavity in which at least one drive, which can be driven by a piston, is located. rod for driving the jaws is movable, wherein the direction of movement of the at least one drive rod and the direction of movement of the jaws perpendicular to each other and / or at an angle between 0 ° and 90 ° to each other. Due to the arrangement of the at least one drive rod in the cavity of the jaws, the space for the clamping device may be lower in the future than previously.

The jaws may have guide slots and / or guide grooves along which guide elements arranged along the at least one drive rod can be moved. The guide slots and / or guide grooves can be made relatively simple and therefore inexpensive. They also enable reliable and trouble-free operation if they are provided on the side cheeks of the jaws. An unwanted wobbling of the jaws is thus excluded.

The guide elements may be feather keys, pins or the like, wherein rollers are storable on the pins. These guide elements are simple, inexpensive standard components. When these guide elements engage in the guide slots and / or guide grooves, they also ensure the reliable and trouble-free operation of the clamping device.

In a further embodiment, the at least one drive rod may be bent at an angle. Then you can do without the slots and grooves in the jaws. In addition, the guide elements can be omitted. In a development of the invention, the jaws can be arranged in a housing which at least partially surrounds them and / or the jaws at least partially surround the housing. This ensures reliable guidance of the jaws so that they can not tilt, wobble or tilt during the process.

In order to minimize the friction between the jaws and the housing during the process of baking, balls and / or rollers and / or pins can be arranged between the jaws and the housing.

If the balls and / or the rollers and / or the pins in grooves provided in the jaws and / or the housing, are guided, then a reliable and at the same time low-friction guidance of the jaws is ensured.

Alternatively or additionally, it is also possible for the balls and / or the rollers and / or the pins to be guided in guide inserts, which can be arranged between the jaws and the housing, in order to ensure a reliable and low-friction guidance of the jaws. The guide inserts can preferably be made of a wear-resistant material.

Plastic sliding elements can be provided between the jaws and the housing. The plastic sliding elements ensure a low friction between the jaws and the housing. So that the jaws can slide along optimally on the plastic sliding elements, webs with two sliding surfaces which slide along the plastic sliding elements can be provided on the jaws.

With a sensor or a camera, which can be arranged between the jaws, it can be determined whether a workpiece was clamped between the clamping elements or not. This ensures a reliable and trouble-free production process.

Alternatively or additionally, a workpiece ejector can be arranged between the jaws. This also ensures a smooth production process.

In order to mount the sensor, the camera and / or the workpiece ejector, a threaded hole can be provided in the housing, which is preferably arranged between the jaws.

The bore may transition into a tubular channel extending along a cylinder receiving the piston. For example, supply wires or supply lines can be routed through the channel.

Advantageously, the piston may have an aperture through which the tubular channel passes. Thus, the required range of motion of the piston is not hindered by the tubular channel. The jaws can be arranged so that they are movable past each other. This arrangement variant may be necessary if the clamping elements for clamping a workpiece must be placed very close to each other. In addition, the available space conditions cause this arrangement variant. However, it is also possible to arrange the jaws so that they move frontally to each other.

The housing may be made of a high strength aluminum which is coatable with a lubricious plastic or made of steel. If the clamping device is to be operated with compressed air, high-strength aluminum is preferred as the material. With a hydraulic actuation of the tensioning device, for example with oil or cooling lubricant, steel is preferred because of the required higher strength values.

The housing and the cylinder can be manufactured particularly inexpensively if they are manufactured in one piece. The integrally manufactured housing then advantageously also has bores for supplying compressed air, in addition to the cylinder.

The at least one drive rod, a sliding element and the guide elements may be integrally formed together. As a result, the installation effort is significantly reduced. The sliding element allows the jaws to be moved with minimal friction. Tilting of the moving components is excluded by the sliding element. Also for ease of assembly, the piston can be bolted to the drive rod.

To further reduce the friction, the sliding element can be greased on its sliding surfaces.

To reduce the wear between the housing and the jaws, the jaws may have a round cross-section. The circular cross section distributes the surface pressure evenly over the circumference of the jaws, so that there are no areas on the jaws which have an extremely high surface pressure during the operation of the clamping device.

For trouble-free operation, it is important that no environmental contaminants get between the jaws and the housing. For this reason, the jaws may have at least one circumferential groove for receiving an O-ring which seals the area between the jaws and the housing. The round cross-section of the jaws can thus be sealed particularly well and with minimal technical effort.

If the jaws are provided with a toothing on their lateral surface, then the jaws and the clamping elements attached to them can be arranged at a certain desired angle at an angle to the horizontal.

An attachment for holding the clamping elements can be mounted on the jaws. The essay can be individually adapted to the respective case of need. Advantageously, the attachment may have a plurality of surfaces for receiving the clamping elements. Thus, the clamping elements can be mounted on the front side, on the side surfaces and on the top of the attachment. Furthermore, the article may have inclined surfaces on which the clamping elements are arranged at a certain angle between 0 ° and 90 ° to the top. In this way, the clamping elements can be arranged depending on the intended use in several specific positions.

The attachment can at least partially surround the housing. It thus prevents unwanted twisting of jaws with a round cross-section.

In a further embodiment, a plurality of drive rods can be integrally connected to a common base. The one-piece design of the base and drive rods can be mounted much faster than if the drive rods have to be mounted individually.

The common base can be guided by an insert arranged in the housing. The insert positions the base with the drive rods arranged in the housing and at the same time serves to guide the base.

The insert and / or the piston may have a triangular base surface, wherein the corner regions are rounded. The housing surrounding the insert and / or the piston is expediently adapted to the triangular contour with the rounded corner areas. Due to the special contour, the insert and / or the piston is twisted securely arranged in the housing. In addition, this contour allows to provide the housing in certain areas with a greater wall thickness, for example, to be able to accommodate mounting holes in the housing wall.

The piston and / or a housing bottom can have a closed circumferential air duct. Due to the closed circumferential air channel, the air can spread quickly and evenly below the piston. In the air duct, the air is not pressed as much as would happen if the air directly from a bore, which could be arranged for example in the housing bottom, would hit the piston.

Various embodiments of the clamping device according to the invention will be explained in more detail with reference to the accompanying drawings.

In detail show:

Figure 1 is a side view of a first embodiment of the clamping device with partially open jaws.

FIG. 2 is a front view of the tensioning device of FIG. 1; FIG.

3 shows a plan view of the clamping device from FIG. 1 with the jaws closed; 4 is a side view of a second embodiment of the clamping device with partially open jaws.

Fig. 5 is a plan view of a third embodiment of the clamping device.

6 is a perspective view of a fourth embodiment of the clamping device;

Fig. 7 is a front view of the tensioning device of Fig. 6;

Fig. 8 is a plan view of a jaw with a round

Cross-section;

9 is a perspective top view of a clamping device provided with an attachment;

FIG. 10 shows a sectional view through the lower region of the tensioning device from FIG. 9; FIG.

11 shows a longitudinal section through a fifth embodiment of the tensioning device;

12 is a perspective plan view of a

Commitment;

Fig. 13 shows a cross section through the housing of

Tensioning device of Fig. 11; Fig. 14 is a plan view of a housing bottom.

Fig. 1 shows a clamping device 10 with two mutually oppositely movable jaws 11 and 12. The jaws 11 and

12 have a cavity in the piston rods 13 and

14 can be moved up and down.

The piston rods 13 and 14 are connected to a piston 15 and can be driven by it. The piston 15 is guided in a cylinder 16, which is used to actuate the piston

15 is subjected to a variable pressure.

In the jaws 11 and 12 obliquely extending slots 17 and 18 are provided in the arranged on the piston rods 13 and 14 pins 19 engage. Due to the oblique course of the slots 17 and 18, the jaws 11 and 12 move laterally back and forth when the piston 15, the piston rods 13 and 14 moves up and down.

Between the jaws 11 and 12, a bore 100 is provided, into which a thread 101 is incorporated. The bore 100 may for example receive a sensor or a camera for workpiece detection. However, it is also possible to mount a workpiece ejector in the bore 100.

The bore 100 merges into a tubular channel 102, which is arranged below the bore 100 and thus extends along the cylinder 16. The piston 15 thus has an opening through which the channel 102 extends. In order to avoid leaks, sealing rings 103 are mounted on the piston 15, sealing rings 104 on the piston rods 13 and 14, and a sealing ring 105 on the channel 102.

The jaws 11 and 12 engage around a housing 20 of the tensioning device 10 (see FIG. 2). In this way, a reliable guidance of the jaws 11 and 12 is ensured. Between the jaws 11 and 12 and the housing 20 guide inserts 21 are mounted, in which balls 22 are arranged. This ensures a reliable and low-friction guidance of the jaws 11 and 12 during the process of the jaws 11 and 12.

The piston rods 13, 14, 30 and 31 are arranged symmetrically to the axes of symmetry of the piston 16 (see Fig. 3). As a result, the piston 16 can be smoothly moved without tilting.

Fig. 4 shows a clamping device 40, in which piston rods 41 and 42 are bent obliquely. In this embodiment, oblique slots or grooves in the jaws can be dispensed with.

In a tensioning device 50 (see FIG. 5), a housing 51 surrounds a jaw 52. This ensures reliable guidance of the jaw 52, which ensures trouble-free operation.

6 shows a tensioning device 60, in which a drive rod 62, a sliding element 63 and a guide element 64 are formed integrally together. A piston 61 is bolted to the drive rod 62. By this construction, the assembly cost can be significantly reduced.

The sliding element 63 avoids tilting of the moving components. Sliding surfaces 65 of the sliding member 63 slide along the inner walls of a jaw 66 along. By lubricating the sliding surfaces 65, the friction between the sliding member 63 and the jaw 66 can be reduced.

The jaw 66 is provided with a guide slot 67 in which the guide member 64 can slide along.

Between the jaw 66 and a housing 70, plastic sliding elements 71 are provided, which reduce the friction between the jaw 66 and the housing 70 (see FIG. 7). The jaw 66 has a web 72 which is arranged between the plastic sliding elements 71.

Fig. 8 shows a jaw 80 having a round cross-section. The jaw 80 is provided with teeth 81, so that an arranged on the jaw 80 clamping element 82 can be arranged at certain angles at an angle to the horizontal. The toothing 81 runs around the entire circumference. For the sake of clarity, however, it is only partially shown.

The Fign. 9 and 10 show a clamping device 90 on the jaws 98 an attachment 91 is mounted.

The attachment 91 has at its end face 92, at its side surfaces 93 and at sloping surfaces 94 Befestigungs- possibilities in the form of holes 95 for attachment of the clamping elements. The clamping elements can thus be arranged in certain positions depending on the purpose.

The attachment 91 partially surrounds a housing 96. It thus prevents unwanted rotation of jaws (80) with a round cross section, which have no teeth 81 (see Fig. 8). In order to fix the jaws 98 and the attachments 93 with each other, holes 97 are provided.

11 shows a clamping device 110 with three jaws 111, 112 and 113 (see also FIG. 13). The jaws 111 and 112 are driven by drive rods 114 and 115. The drive rods 114 and 115 and a third drive rod not shown here are connected to a common base 116. Thus, the drive rods 114, 115 and the third drive rod, not shown here in detail, are formed integrally with the base 116.

The base 116 is surrounded by an insert 117 (see Figures 11 and 12). The insert 117 serves to guide the base 116 and positions the base 116 in a housing 118. The insert 117 is provided with a star-shaped recess 120, through which the drive rods 114, 115 and the third drive rod (not shown here) and the base 116 can be performed.

Both the insert 117 (see FIG. 12) and a piston 130 (see FIG. 13) have a triangular base on whose corners are rounded. The housing 117 surrounding the insert 117 and / or the piston 130 is adapted to the triangular contour with the rounded corner areas. As a result, the insert 117 and / or the piston 130 in the housing 118 can not rotate. In addition, by this contour, the wall thickness of the housing 118 can be sized larger in different areas to provide mounting holes 131, 132 and 133 can.

14 shows a housing bottom 140 with a closed circumferential air channel 141. The closed circumferential air channel 141 is connected by means of a connecting channel 142 with a bore 143. Compressed air escapes from the bore 143 and is distributed uniformly in the closed circumferential air channel 141 below the piston, which is not shown here.

LIST OF REFERENCE NUMBERS

10 clamping device 51 housing

11 cheek 52 cheek

12 jaw 35 60 clamping device

13 drive rod 61 piston

14 Drive rod 62 Drive rod

15 piston 63 sliding element

16 cylinders 64 guide element

17 slot 40 65 sliding surfaces

18 slot 66 cheek

19 pin 67 guide slot

100 bore

101 thread 70 housing

102 channel 45 71 Plastic gleitele

103 sealing ring ment

104 sealing ring 72 bridge

105 sealing ring

80 cheek

20 housing 50 81 toothing

21 Guide insert 82 Clamping element

22 ball

90 clamping device

30 Drive rod 91 attachment

31 Drive rod 55 92 Front side

93 side surfaces

40 clamping device 94 inclined surface

41 Drive rod 95 Bore 42 Drive rod 96 Housing

60 97 bore

50 Clamp 98 Baking 110 clamping device 130 piston

111 Baking 131 Fixing hole

112 jaws 132 mounting hole

113 Baking 15 133 Mounting hole 114 Drive rod

115 Drive rod 140 Caseback

116 base 141 air duct

117 Insert 142 Connecting channel

118 Housing 20 143 Bore

120 recess

Claims

1. clamping device (10, 40, 50, 60, 90, 110) with each other in opposite directions movable jaws (11, 12, 52, 66, 80, 98, 111, 112, 113), on which clamping elements can be arranged, thereby characterized in that the jaws (11, 12, 52, 66, 80, 98, 111, 112, 113) each have a cavity, in which at least one drive rod (13, 14, 13, 14, 13) can be driven by a piston (15, 61, 130). 30, 31, 41, 42, 62, 114, 115) for driving the jaws (11, 12, 52, 66, 80, 98,

111, 112, 113), wherein the direction of movement of the at least one drive rod (13, 14, 30, 31, 41, 42, 62, 114, 115) and the direction of movement of the jaws (11, 12, 52, 66, 80 , 98, 111,

112, 113) perpendicular to each other and / or at an angle between 0 ° and 90 ° to each other.

Second tensioning device (10, 50, 60) according to claim 1, characterized in that the jaws (11, 12, 52, 66) guide slots (17, 18, 67) and / or guide grooves, along which at least one Drive rod (13, 14) arranged guide elements (64) are movable.

3. Clamping device (10, 50) according to claim 2, characterized in that the guide elements are feather keys, pins (19) or the like, wherein on the pins (19) rollers are storable.

4. clamping device (40, 110) according to one of claims 1 to 3, characterized in that the at least one drive rod (41, 42, 114, 115) is bent obliquely.

5. Clamping device (10, 40, 50, 110) according to one of claims 1 to 4, characterized in that the jaws (52, 111, 112, 113) in an at least partially surrounding housing (51, 118) are arranged and / or that the jaws (11, 12) at least partially surround the housing (20).

6. tensioning device (10, 50) according to one of claims 1 to 5, characterized in that between the blocks (11, 12, 52) and the housing (20, 51) balls and / or rollers and / or pins arranged are.

7. Clamping device (10, 50) according to claim 6, characterized in that the balls and / or the rollers and / or the pins in grooves which are provided in the jaws and / or the housing (20, 51), are feasible ,

8. Clamping device (10, 50) according to claim 6 or 7, characterized in that the balls and / or the

Rolls and / or the pins in guide inserts (21) which can be arranged between the jaws (11, 12, 52) and the housing (20, 51) can be guided.

9. Clamping device (60) according to one of claims 1 to 8, characterized in that between the jaws (66) and the housing (70) plastic sliding elements (71) are provided.

10. Clamping device (60) according to claim 9, characterized in that webs (72) are provided on the jaws (66) with two sliding surfaces which slide along the plastic sliding elements (71).

11. Clamping device (10, 40, 50, 60, 90) according to one of claims 1 to 10, characterized in that between the jaws (11, 12, 52, 66, 98) a sensor or a camera can be arranged.

12. clamping device (10, 40, 50, 60, 90) according to one of claims 1 to 11, characterized in that between the jaws (11, 12, 52, 66, 98) a Werkstückauswerfer is arranged.

13. Clamping device (10, 40, 50) according to any one of claims 5 to 12, characterized in that in the

Housing (20, 51) provided with a thread (101) bore (100) is provided.

14. Clamping device (10, 40, 50) according to claim 13, characterized in that the bore (100) merges into a tubular channel (102) which extends along a piston (15) receiving the cylinder (16).

15. Clamping device (10, 40, 50) according to claim 14, characterized in that the piston (15) has a Breakthrough, through which the tubular channel (102) extends.

16. Clamping device according to one of claims 1 to 15, characterized in that the jaws are arranged so that they are moved past each other.

17. Clamping device (10, 40, 50) according to any one of claims 5 to 16, characterized in that the housing (20, 51, 70) made of a high-strength aluminum, which is coatable with a lubricious plastic, or made of steel is.

18. Clamping device (10, 40, 50) according to any one of claims 14 to 17, characterized in that the cylinder (16) and the housing (20, 51, 70) are made in one piece.

19. Clamping device (60) according to one of claims 1 to 18, characterized in that the at least one

Drive rod (62), a sliding element (63) and the guide elements (64) are formed integrally together.

20. Clamping device (60) according to one of claims 1 to 19, characterized in that the piston (61) with the drive rod (62) can be screwed.

21. Clamping device (60) according to claim 19 or 20, character- ized in that the sliding element (63) on its sliding surfaces (65) is fatigued.

22. Clamping device according to one of claims 1 to 21, characterized in that the jaws (80) have a round cross-section.

23. Clamping device according to claim 22, characterized in that the jaws (80) have at least one circumferential groove for receiving an O-ring.

24. Clamping device according to claim 22 or 23, characterized in that the jaws (80) on its lateral surface with a toothing (81) are provided.

25. Clamping device (90) according to one of claims 1 to 24, characterized in that on the jaws (98) an attachment (93) for receiving the clamping elements can be mounted.

26. Clamping device (90) according to claim 25, characterized in that the attachment (93) surrounds the housing (96) at least partially.

27, clamping device (90) according to claim 25 or 26, characterized in that the attachment (93) has a plurality of surfaces for receiving the clamping elements.

28, clamping device (110) according to one of claims 1 to 27, characterized in that a plurality of drive rods (114, 115) are integrally connected to a common base (116).

29. Clamping device (110) according to claim 28, characterized in that the common base (116) of an insert (117) arranged in the housing (118) can be guided.

30. Clamping device (110) according to claim 28 or 29, character- ized in that the insert (117) and / or the piston (130) has a triangular base surface, wherein the corner regions are rounded.

31. Clamping device (10, 40, 50, 60, 90, 110) according to one of claims 1 to 30, characterized in that the piston and / or a housing bottom (140) has a closed circumferential air channel (141).