CN215147029U - Workpiece clamping device - Google Patents

Abstract

The present disclosure relates to a workpiece holding device, comprising: a supporting seat; the sliding seat is connected to the supporting seat in a sliding manner; the two clamps are arranged in an intersecting manner and are coaxially hinged on the sliding seat in an intersecting position, and first ends of the two clamps extend out of the supporting seat to be used for clamping a workpiece; the two elastic pieces are respectively positioned on two sides of the sliding seat, one ends of the two elastic pieces are connected with the side wall of the sliding seat, the other ends of the two elastic pieces are connected with the supporting seat, and the two elastic pieces are used for pushing the sliding seat to reset; the driving assembly is used for driving the first ends of the two clamps to be far away from or close to each other so as to clamp a workpiece in a releasable mode, the driving assembly is connected to the supporting seat, and the driving end of the driving assembly is in transmission connection with the second ends of the two clamps. The workpiece clamping device can finely adjust the clamping position according to the position of the workpiece, so that the clamping effect on the workpiece is ensured, and the workpiece is prevented from being damaged.

Description

Workpiece clamping device

Technical Field

The disclosure relates to the technical field of machining, in particular to a workpiece clamping device.

Background

In actual production, when a workpiece is machined, the workpiece needs to be clamped.

However, in the conventional clamping device, if the relative position of the clamping device and a workpiece deviates in the workpiece clamping process, the clamping position is prone to be inaccurate, and meanwhile, the workpiece is damaged due to deviation clamping.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a workpiece clamping device can finely tune the clamping position according to the position of work piece, guarantees the clamping action to the work piece, avoids causing the damage to the work piece.

In order to achieve the above object, the present disclosure provides a workpiece holding device comprising:

a supporting seat;

the sliding seat is connected to the supporting seat in a sliding manner;

the two clamps are arranged in an intersecting manner and are coaxially hinged to the sliding seat in an intersecting position, and first ends of the two clamps extend out of the supporting seat to be used for clamping a workpiece;

the two elastic pieces are respectively positioned on two sides of the sliding seat, one end of each elastic piece is connected with the side wall of the sliding seat, the other end of each elastic piece is connected with the supporting seat, and the two elastic pieces are used for pushing the sliding seat to reset;

the driving assembly is used for driving the first ends of the two clamps to be far away from or close to each other so as to clamp a workpiece in a releasable mode, the driving assembly is connected to the supporting seat, and the driving end of the driving assembly is in transmission connection with the second ends of the two clamps.

Optionally, sliding rods are arranged on two sides of the sliding seat, one end of each of the two sliding rods is connected with two sides of the sliding seat, and the other end of each of the two sliding rods is connected with the supporting seat in a sliding manner.

Optionally, the two elastic members are first springs, and the two first springs are respectively sleeved on the two sliding rods.

Optionally, a limiting groove for limiting the sliding direction of the sliding seat is arranged on the supporting seat, and the bottom end of the sliding seat is arranged in the limiting groove in a sliding manner.

Optionally, the driving assembly includes a telescopic mechanism and a return member, the telescopic mechanism is connected to the supporting seat, a telescopic end of the telescopic mechanism can extend or contract towards a direction close to or away from the second ends of the two clamps, one end of the return member is connected to the second ends of the two clamps, the other end of the return member is connected to the supporting seat, and the return member is configured to apply a pushing force to the second ends of the two clamps to make the second ends of the two clamps close to each other;

the workpiece clamping device is provided with a clamping state and a releasing state, in the releasing state, the telescopic end of the telescopic mechanism extends into the space between the second ends of the two clamps and overcomes the defect that the second ends of the two clamps are far away from each other due to the pushing force, in the clamping state, the telescopic end of the telescopic mechanism retracts from the space between the second ends of the two clamps, and the return piece pushes the second ends of the two clamps to be close to each other.

Optionally, the return member is two second springs, the second ends of the two clamps are located between the two second springs, one end of each of the two second springs is connected to the support seat, and the other end of each of the two second springs is connected to the corresponding second end of the clamp.

Optionally, the driving assembly further comprises a supporting rod, a through channel is arranged at the second end of the two clamps, the supporting rod penetrates through the two channels, two ends of the supporting rod are respectively connected with the supporting seat, and the two second springs are respectively sleeved at two ends of the supporting rod.

Optionally, a tip of a pointed cone shape is arranged on the telescopic end of the telescopic mechanism, and the tip of the tip faces between the second ends of the two clamps.

Optionally, a rotating wheel for contacting with the plug is rotatably arranged on the second end of each of the two clamps.

Optionally, the first ends of the two clamps are provided with contact blocks on opposite faces for contacting the workpiece.

In the above scheme, through the sliding seat and the elastic piece that set up, can adjust the position of clamp when the position deviation appears in the work piece for two clamps can move the both sides of work piece, realize the centre gripping to the work piece. Meanwhile, under the action of the elastic piece, after the workpiece is clamped, the sliding seat can be driven to return to the original position, the position of the clamped workpiece is adjusted, the accuracy of the clamping position is guaranteed, and the workpiece is convenient to process. The workpiece clamping device can be suitable for clamping workpieces under the condition that the positions of the workpieces are deviated, and the condition that the workpieces are damaged in the clamping process cannot occur. The workpiece clamping device is convenient to operate, can realize quick clamping of workpieces, improves production efficiency and reduces working hours.

Additional features and advantages of the disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is a schematic perspective view of a workpiece holding device according to one embodiment of the present disclosure;

FIG. 2 is a front view of a workpiece holding device according to one embodiment of the present disclosure;

FIG. 3 is a top view of a workpiece holding device according to one embodiment of the present disclosure;

fig. 4 is an exploded view of a workpiece holding device according to an embodiment of the present disclosure.

Description of the reference numerals

1. A supporting seat; 2. a telescoping mechanism; 3. ejecting the head; 4. a support bar; 5. a first spring; 6. clamping; 7. a channel; 8. a rotating wheel; 9. a slide bar; 10. a second spring; 11. a sliding seat; 12. a rotating shaft; 13. a contact block; 14. a workpiece; 15. a limiting groove; 16. a through hole; 17. and (4) a slide hole.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise specified, the use of directional terms such as "upper, lower, left, and right" are generally defined in the direction of the drawing plane of the drawings, and "inner and outer" refer to the inner and outer of the relevant component parts. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present disclosure, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present disclosure can be understood in specific instances by those of ordinary skill in the art.

As shown in fig. 1 to 4, the present disclosure provides a workpiece holding device including: the supporting seat 1, the sliding seat 11, the two clamps 6, the driving component and the two elastic components.

The sliding seat 11 is connected to the supporting seat 1 in a sliding manner. The two clamps 6 are arranged in an intersecting manner and are coaxially hinged on the sliding seat 11 at an intersecting position, and first ends of the two clamps 6 extend out of the supporting seat 1 and are used for clamping a workpiece 14. Two elastic components are located the both sides of sliding seat 11, and two elastic components's one end is connected with the lateral wall of sliding seat 11, and the other end is connected with supporting seat 1, and two elastic components are used for promoting sliding seat 11 and reset. The driving component is used for driving the first ends of the two clamps 6 to move away from or close to each other so as to releasably clamp the workpiece 14, the driving component is connected to the supporting seat 1, and the driving end of the driving component is in transmission connection with the second ends of the two clamps 6.

The sliding seat 11 can slide back and forth on the supporting seat 1, and since the two clamps 6 are hinged on the sliding seat 11, when the sliding seat 11 slides, the two clamps 6 move along with the sliding seat 11, so that the clamping position is changed, and the position deviation of the workpiece 14 is adapted. Alternatively, in the present embodiment, the middle portions of the two clamps 6 are in an intersecting position, so that the middle portions of the two clamps 6 are hinged with the sliding seat 11. It should be noted that the intersecting position of the two clamps 6 can be set according to different force arms to be clamped, and can be one end close to the driving assembly or one end far away from the driving assembly, which can be specifically selected according to actual needs.

The two elastic pieces are used for pushing the sliding seat 11 to reset, so that after the workpiece 14 is clamped, the position of the workpiece 14 can be adjusted, further processing in the next step is facilitated, and independent adjustment is not needed. It should be noted that, when the workpiece 14 has a positional deviation before being clamped, and when the first ends of the two clamps 6 are away from each other under the action of the driving assembly, and approach the workpiece 14, the first end of one of the clamps 6 is close to the workpiece 14, the first end of the other clamp 6 is far from the workpiece 14, and the first end of the close clamp 6 contacts the workpiece 14, at this time, the sliding seat 11 is pushed to slide, the elastic member on the corresponding side is squeezed, and the elastic member is elastically deformed, so that the workpiece 14 can be clamped by the first ends of the two clamps 6, and after the workpiece 14 is clamped by the two clamps 6, the elastic member is restored to be deformed, so that the sliding seat 11 is pushed to reset, thereby not only realizing the clamping of the workpiece 14, but also realizing the adjustment of the position of the workpiece 14, and facilitating the next processing.

The sliding seat 11 is provided with a rotating shaft 12, the two clamps 6 are provided with unthreaded holes, and the rotating shaft 12 rotates to penetrate through the unthreaded holes of the two clamps 6, so that the two clamps 6 can rotate around the axis of the rotating shaft 12.

In the above scheme, through the arranged sliding seat 11 and the elastic member, when the workpiece 14 has a position deviation, the positions of the two clamps 6 can be adjusted, so that the first ends of the two clamps 6 can move to two sides of the workpiece 14, and the workpiece 14 is clamped. Meanwhile, under the action of the elastic piece, after the workpiece 14 is clamped, the sliding seat 11 can be driven to return to the original position, the position of the clamped workpiece 14 is adjusted, the accuracy of the clamping position is guaranteed, and the processing is convenient. The workpiece clamping device can be suitable for clamping the workpiece 14 under the condition of position deviation, and the workpiece 14 cannot be damaged in the clamping process. The workpiece clamping device is convenient to operate, can realize quick clamping of the workpiece 14, improves production efficiency and reduces working hours.

Optionally, in an embodiment of the present disclosure, the supporting seat 1 is a square box body with an open top end and an open side, wherein the second ends of the two clamps 6 are located in the square box body, and the first ends of the two clamps 6 extend out of the square box body through the open side. Wherein, sliding seat 11 and elastic component all are located square box. The structure can reduce the overall structure of the workpiece clamping device, is beneficial to being installed on external equipment for use, and can be conveniently overhauled due to the open design.

Alternatively, in other embodiments of the present disclosure, the supporting seat 1 is a solid block, and the clamp 6, the sliding seat 11, and the elastic member may be disposed on the surface of the solid block. In addition, the supporting seat 1 can also be a frame structure, and can be specifically selected according to the requirement.

Optionally, in an embodiment of the present disclosure, two sliding rods 9 are disposed on two sides of the sliding seat 11, one end of each of the two sliding rods 9 is connected to two sides of the sliding seat 11, and the other end is slidably connected to the supporting seat 1.

The sliding seat 11 is connected with the supporting seat 1 in a sliding manner through the sliding rod 9, wherein sliding holes 17 are formed in two sides of the supporting seat 1, the other end of the sliding rod 9 penetrates through the sliding holes 17 in a sliding manner, and when the sliding seat 11 slides towards one side of the supporting seat 1, the sliding rod 9 on the corresponding side gradually slides out through the corresponding sliding hole 17. Through the effect of slide bar 9, can avoid slide block 11 to slide at will in supporting seat 1 for slide block 11 can keep linear motion, thereby adjusts the centre gripping distance of the first end of two clamps 6, adapts to the condition that workpiece 14 appears the position deviation.

Optionally, in an embodiment of the present disclosure, the two elastic members are first springs 5, and the two first springs 5 are respectively sleeved on the two sliding rods 9.

Wherein, first spring 5 is compression spring, and two first springs 5 are located the both sides of sliding seat 11, when sliding seat 11 slides to supporting seat 1 one side, produce extrusion compressive force to corresponding first spring 5, when accomplishing to press from both sides the back of getting, and first spring 5 kick-backs for sliding seat 11 resets. Wherein, one end of the first spring 5 is connected with the outer side wall of the sliding seat 11, and the other end is connected with the side wall of the supporting seat 1.

Alternatively, in other embodiments of the present disclosure, the two elastic members may be highly elastic rubber, by which the effects of compression set and rebound can be also achieved. Of course, other elastic materials may be used as long as the effects of compression set and rebound can be achieved.

Optionally, in an embodiment of the present disclosure, the supporting seat 1 is provided with a limiting groove 15 for limiting the sliding direction of the sliding seat 11, and the bottom end of the sliding seat 11 is slidably disposed in the limiting groove 15.

The direction of the limiting groove 15 is parallel to the direction of the sliding rod 9, the sliding direction of the sliding seat 11 is further kept under the action of the limiting groove 15, and the sliding seat 11 slides in the limiting groove 15, so that the situation of clamping is avoided.

Optionally, in an embodiment of the present disclosure, the driving assembly includes a telescopic mechanism 2 and a return member, the telescopic mechanism 2 is connected to the supporting seat 1, a telescopic end of the telescopic mechanism 2 can be extended or shortened toward a direction approaching or departing from the second ends of the two clamps 6, one end of the return member is connected to the second ends of the two clamps 6, the other end of the return member is connected to the supporting seat 1, and the return member is configured to apply a pushing force to the second ends of the two clamps 6 to make the second ends of the two clamps 6 approach each other;

the workpiece clamping device is provided with a clamping state and a releasing state, in the releasing state, the telescopic end of the telescopic mechanism 2 extends between the second ends of the two clamps 6 and overcomes the thrust to push the second ends of the two clamps 6 to be away from each other, in the clamping state, the telescopic end of the telescopic mechanism 2 retracts from between the second ends of the two clamps 6, and the return piece pushes the second ends of the two clamps 6 to be close to each other.

Wherein, telescopic machanism 2 and the lateral wall fixed connection of supporting seat 1, and be equipped with the through-hole 16 that the flexible end that is used for telescopic machanism 2 stretched into in the supporting seat 1 on the supporting seat 1, when telescopic machanism 2's flexible end is stretched forward, held the top with the second of two clamps 6 and pushed away, makes two the second of clamp 6 is held and is kept away from each other, because the articulated of two clamps 6, the first end of two clamps 6 is kept away from each other equally, does benefit to work piece 14 this moment and enters into the first end of two clamps 6 in by the centre gripping. And the return member is used for pushing the second ends of the two clamps 6 to approach each other, so that the first ends of the two clamps 6 also approach each other to realize a clamping function, and when the telescopic end of the telescopic mechanism 2 retracts, the second ends of the two clamps 6 approach each other under the action of the return member, so that the workpiece 14 is clamped. The telescopic mechanism 2 and the return member complete the opposite driving process.

In the present embodiment, the telescopic mechanism 2 is an electric push rod, a hydraulic telescopic rod or a pneumatic telescopic rod, and the telescopic pushing function can be realized.

Optionally, in other embodiments of the present disclosure, the driving assembly includes a winding device, a return spring and two cables, wherein the return spring is located between the second ends of the two clamps 6, and is used for moving the second ends of the two clamps 6 closer to each other, the winding end of the winding device is connected to one end of the two cables, the other end of the two cables is connected to the second end of the two clamps 6, the cables are wound by the winding device, so that the second ends of the two clamps 6 are moved away from each other, the workpiece 14 is placed in the winding device, and when the winding is stopped, the second ends of the two clamps 6 are moved closer to each other, so that the workpiece 14 is clamped by the winding device.

Optionally, in an embodiment of the present disclosure, the return member is two second springs 10, the second ends of the two clamps 6 are located between the two second springs 10, one end of each of the two second springs 10 is connected to the support base 1, and the other end is connected to the second end of the corresponding clamp 6.

In this embodiment, the second springs 10 are compression springs, and after the second ends of the two clamps 6 are pushed away by the retracting mechanism 2, the second ends of the two clamps 6 press the two second springs 10, so that the two second springs 10 deform, and when the retracting end of the retracting mechanism 2 retracts, the second ends of the two clamps 6 approach each other under the action of the two second springs 10, and maintain the clamping force, thereby clamping the workpiece 14.

Alternatively, in other embodiments of the present disclosure, the return member is a highly elastic rubber, by which the effects of compression set and rebound can also be achieved. Of course, other elastic materials may be used as long as the effects of compression set and rebound can be achieved.

Optionally, in an embodiment of the present disclosure, the driving assembly further includes a supporting rod 4, a through channel 7 is disposed on the second end of the two clamps 6, the supporting rod 4 passes through the two channels 7, two ends of the supporting rod 4 are respectively connected with the supporting seat 1, and two second springs 10 are respectively sleeved on two ends of the supporting rod 4.

Wherein, in this embodiment, bracing piece 4 is used for spacing second spring 10, guarantees the elastic compression deformation of second spring 10, avoids appearing the excessive bending of second spring 10, influences the result of use. The channel 7 provided at the second end of the two clamps 6 is used for the support rod 4 to pass through, so that the support rod 4 ensures the limiting effect on the second spring 10, and the support rod 4 does not influence the mutual distance of the second ends of the two clamps 6. It should be noted that the size of the channel 7 is much larger than that of the supporting rod 4, so that when the second ends of the two clamps 6 are far away from each other, the supporting rod 4 can move in the channel 7, and therefore the problem that the second ends of the clamps 6 cannot be far away from each other due to the clamping of the supporting rod 4 and the channel 7 does not occur.

In the present embodiment, mounting holes are formed in the side walls of the supporting base 1, and the two ends of the supporting rod 4 are inserted into the corresponding mounting holes respectively.

Optionally, in an embodiment of the present disclosure, a tip 3 of a taper type is provided on the telescopic end of the telescopic mechanism 2, and a tip of the tip 3 faces between the second ends of the two clamps 6.

In the embodiment, the plug 3 is used for pushing the second ends of the two clamps 6 to be separated, and after the plug 3 is driven by the telescopic end of the telescopic mechanism 2 to extend into the second ends of the two clamps 6, the second ends of the two clamps 6 are continuously separated along with the increase of the section diameter of the pointed cone of the plug 3, so that the workpiece 14 is placed into the workpiece. Due to the pointed cone type arrangement of the top head 3, the top head 3 can conveniently extend into the second ends of the two clamps 6, and the second ends of the two clamps 6 can be pushed to be separated.

Optionally, in an embodiment of the present disclosure, a rotating wheel 8 for contacting with the plug 3 is rotatably provided on the second end of each of the two clamps 6.

Wherein, in this embodiment, runner 8 horizontal rotation is connected on the second end of clamp 6, when top 3 moves towards the direction between the second end of two clamps 6 under the drive of the flexible end of telescopic machanism 2, with the outer rampart contact of two runners 8, realize the second end top of two clamps 6, simultaneously because the rotation effect of two runners 8 for it is more convenient that top 3 promotes the second end of two clamps 6 and keeps away from each other, reduces the frictional force effect of contact. It should be noted that for better contact with the plug 3, the diameter of the runner 8 is larger and the outer annular wall of the rotation is exposed at the second end of the clamp 6.

Optionally, in one embodiment of the present disclosure, contact blocks 13 for contacting the workpiece 14 are provided on opposite faces of the first ends of the two clamps 6.

In the present embodiment, the contact block 13 is provided to be able to contact the workpiece 14 more effectively and protect the workpiece 14. The contact block 13 may be made of soft rubber and may be screwed to the first ends of the two clamps 6.

In an embodiment of the present disclosure, when the workpiece 14 needs to be clamped, if the position of the workpiece 14 does not deviate, the telescopic end of the telescopic mechanism 2 drives the plug 3 to push the second ends of the two clamps 6 apart, and then the support base 1 is moved to be close to the workpiece 14, at this time, the workpiece 14 directly enters the first ends of the two clamps 6, and after the telescopic end of the telescopic mechanism 2 retracts, the second ends of the two clamps 6 are close to each other under the action of the second spring 10, so as to clamp the workpiece 14.

If the position of the workpiece 14 deviates, the telescopic end of the telescopic mechanism 2 drives the ejector 3 to push the second ends of the two clamps 6 apart, then the support base 1 is moved to be close to the workpiece 14, at this time, the first end of one clamp 6 is close to the workpiece 14, after the first end of the clamp 6 is contacted with the workpiece 14, the sliding base 11 is driven to move in the limiting groove 15 towards the direction close to the workpiece 14, the corresponding first spring 5 is compressed, and due to the supporting effect of the ejector 3 on the second ends of the two clamps 6, the distance between the first ends of the two clamps 6 is increased, so that the workpiece 14 can be clamped, at this time, the telescopic end of the telescopic mechanism 2 retracts, the second ends of the two clamps 6 approach under the effect of the first spring 5 to clamp the workpiece 14, after the workpiece 14 is clamped, the sliding base 11 is reset under the resilience effect of the first spring 5, so that the workpiece 14 is clamped to the central position, and clamping is finished, and clamping is realized.

The workpiece clamping device can adjust the relative position of the clamp 6 and the workpiece 14 according to the position of the workpiece 14, the adjusting range is 5mm, the workpiece 14 can be clamped quickly, the clamping effect on the workpiece 14 cannot be influenced due to the position deviation of the workpiece 14, and meanwhile, the workpiece 14 is prevented from being damaged.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims (10)

1. A workpiece holding device, comprising:

a support base (1);

the sliding seat (11), the sliding seat (11) is connected to the supporting seat (1) in a sliding manner;

the two clamps (6) are arranged in an intersecting manner, and are coaxially hinged on the sliding seat (11) at intersecting positions, and first ends of the two clamps (6) extend out of the supporting seat (1) and are used for clamping a workpiece;

the two elastic pieces are respectively positioned on two sides of the sliding seat (11), one end of each elastic piece is connected with the side wall of the sliding seat (11), the other end of each elastic piece is connected with the supporting seat (1), and the two elastic pieces are used for pushing the sliding seat (11) to reset;

the driving assembly is used for driving the first ends of the two clamps (6) to be away from or close to each other so as to clamp a workpiece in a releasable mode, the driving assembly is connected to the supporting seat (1), and the driving end of the driving assembly is in transmission connection with the second ends of the two clamps (6).

2. Workpiece clamping device according to claim 1, characterised in that the slide shoe (11) is provided with slide rods (9) on both sides, and that the two slide rods (9) are connected with the slide shoe (11) on both sides at one end and with the support shoe (1) on the other end.

3. Workpiece holding device according to claim 2, characterised in that the two resilient members are first springs (5), the two first springs (5) being arranged to fit over the two slide rods (9), respectively.

4. The workpiece holding device according to claim 1, wherein the supporting seat (1) is provided with a limiting groove (15) for limiting the sliding direction of the sliding seat (11), and the bottom end of the sliding seat (11) is slidably disposed in the limiting groove (15).

5. The workpiece holding device according to claim 1, characterized in that the driving assembly comprises a telescopic mechanism (2) and a return member, the telescopic mechanism (2) is connected to the supporting base (1), the telescopic end of the telescopic mechanism (2) can be extended or shortened towards the direction close to or away from the second ends of the two clamps (6), one end of the return member is connected with the second ends of the two clamps (6), the other end of the return member is connected with the supporting base (1), and the return member is used for applying a pushing force to the second ends of the two clamps (6) to make the second ends of the clamps (6) close to each other;

the workpiece clamping device is provided with a clamping state and a releasing state, in the releasing state, the telescopic end of the telescopic mechanism (2) extends into the space between the second ends of the two clamps (6) and overcomes the defect that the second ends of the two clamps (6) are far away from each other due to pushing force pushing, in the clamping state, the telescopic end of the telescopic mechanism (2) retracts from the space between the second ends of the two clamps (6), and the return piece pushes the second ends of the two clamps (6) to be close to each other.

6. Workpiece holding device according to claim 5, characterised in that the return means are two second springs (10), the second ends of the two clamps (6) being located between the two second springs (10), one end of each of the two second springs (10) being connected to the support (1) and the other end being connected to the second end of the respective clamp (6).

7. The workpiece clamping device as recited in claim 6, characterized in that the driving assembly further comprises a supporting rod (4), a through channel (7) is provided at the second end of the two clamps (6), the supporting rod (4) passes through the two channels (7), the two ends of the supporting rod (4) are respectively connected with the supporting seat (1), and the two second springs (10) are respectively sleeved at the two ends of the supporting rod (4).

8. Workpiece holding device according to claim 5, characterised in that the telescopic end of the telescopic mechanism (2) is provided with a pointed cone shaped head (3), the point of the head (3) facing between the second ends of the two clamps (6).

9. Workpiece holding device according to claim 8, characterised in that a turning wheel (8) for contact with the plug (3) is rotatably arranged on the second end of both clamps (6).

10. A workpiece holding device as claimed in any one of claims 1 to 9, characterised in that the first ends of the two clamps (6) are provided with contact blocks (13) on opposite faces for contact with the workpiece.

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