CN223670993U - A jig for grinding wheel machining - Google Patents

Abstract

This invention provides a jig for grinding wheel processing. The jig includes a jig base for placing the grinding wheel and a clamping device for holding the grinding wheel. The upper surface of the jig base has a sliding groove. The clamping device includes a sliding plate, a clamping head, a motor, a bidirectional threaded screw, and a limiting post. The sliding plate is slidably connected to the sliding groove, and the clamping head is slidably connected to the upper surface of the sliding plate. The sliding plate is connected to the bidirectional threaded screw through a thread in its internal through-hole wall. The motor is fixedly connected to one end of the bidirectional threaded screw. Preferably, the jig further includes a stabilizing device to further improve the clamping stability. The clamping device of this invention can quickly adjust the positions of the sliding plate and the clamping head, and adjust their relative positions to adjust the clamping range of the jig. The jig offers high clamping flexibility and can stably clamp workpieces of different specifications, improving the production efficiency of grinding wheel processing.

Description

Clamp for grinding wheel machining

Technical Field

The utility model belongs to the technical field of grinding wheel machining, and particularly relates to a clamp for grinding wheel machining.

Background

The grinding wheel is the most main grinding tool in grinding processing, the grinding wheel is a fixed grinding tool which is formed by fixing common grinding materials into a certain shape (most of the grinding wheels are round, a through hole is formed in the center), and has certain strength, the grinding wheel is generally formed by grinding materials, a binding agent and air holes, the three parts are commonly called as three elements of the fixed grinding tool, and a clamp is used for clamping the grinding wheel in the processing process of the grinding wheel, so that the grinding wheel is more convenient to process.

The utility model patent with publication number CN209380567U discloses a positioning clamp for grinding wheel processing, which comprises an operation table, wherein the middle part of the operation table is provided with a mounting cavity, the middle part of the mounting cavity is rotationally provided with a screw rod, the middle part of the screw rod is rotationally sleeved with two ball nut seats, the moving directions of the two ball nut seats are opposite, one side of the operation table is fixedly connected with a servo motor, one end of the screw rod penetrates through one side of the mounting cavity and one side of the operation table and is in transmission connection with the output end of the servo motor, and the clamping plate can be driven by the mounting cavity, the screw rod, the ball nut seats, the servo motor, a coupler and a rotating shaft to clamp and fix the grinding wheel by using two modes of electric and manual driving.

However, the inventor finds that when the existing clamp for grinding wheel processing is used in daily work, the grinding wheel can only be clamped through the moving area of the clamping block in the clamp, once the size of the grinding wheel is larger than the moving area of the clamping block of the clamp, the clamp cannot clamp the grinding wheel, and the large-size clamp needs to be replaced, so that the operation is troublesome, a large amount of time is wasted, and the grinding wheel processing efficiency is affected. Therefore, in order to avoid the problem that the machining efficiency is affected due to the fact that the clamp is not matched with the grinding wheel in size or specification, it is highly desirable to provide a clamp which can be used for clamping grinding wheels in different sizes or specifications.

Disclosure of utility model

Aiming at the defects of the prior art, the clamping device provided by the utility model has the advantages that the positions of the sliding plate and the clamping head can be quickly adjusted, the relative positions of the sliding plate and the clamping head can be adjusted to adjust the clamping range of the clamp, the clamping flexibility of the clamp is high, the stable clamping of workpieces with different specifications can be realized, and the production efficiency of grinding wheel processing is improved.

The aim of the utility model is achieved by the following technical scheme:

The utility model provides a clamp for grinding wheel machining, which comprises a clamp seat and a clamping device. The clamp seat is used for placing the grinding wheel, and the clamping device is used for clamping the grinding wheel.

Further, a chute is formed in the upper surface of the clamp seat.

The clamping device comprises at least two sliding plates, clamping heads, a motor, two bidirectional threaded screws and limiting columns, wherein the sliding plates are in sliding connection with sliding grooves formed in the upper surface of a clamp seat, through holes corresponding to the bidirectional threaded screws are formed in the sliding plates along the sliding directions of the sliding grooves, threads matched with the bidirectional threaded screws are formed in the walls of the through holes, the sliding plates are connected with the bidirectional threaded screws through the threads formed in the walls of the through holes in the sliding plates, the motor is fixedly connected with one end of each bidirectional threaded screw, the clamping heads are in sliding connection with the upper surface of each sliding plate, the limiting columns are in sliding connection with the inner portion of each clamping head along the direction perpendicular to the sliding plates, and limiting holes capable of being inserted into the limiting columns are formed in the upper surface of each sliding plate.

Further, the number of the sliding plates is two, and threads arranged on the inner through hole walls of the two sliding plates can be matched with threads in different directions of the bidirectional threaded screw respectively. So that the two sliding plates can move in opposite directions along with the rotation of the bidirectional threaded screw, and the clamping head can clamp or release the clamping.

When the number of the sliding plates is more than three, the more than three sliding plates are different sliding plates with threads which can be matched with the threads of the bidirectional threaded screw in different directions respectively.

Further, the motor is fixed on the side wall of the clamp seat.

Further, the number of the limiting columns is more than two, preferably, the number of the limiting columns is a multiple of 2, more preferably, the limiting columns are symmetrically distributed on two sides of the bidirectional threaded screw along the extending direction perpendicular to the bidirectional threaded screw, for example, the number of the limiting columns is 4, the number of the limiting columns is 2, and the number of the limiting columns is 2.

Further, the limiting holes comprise a plurality of groups of limiting holes arranged along the sliding direction of the sliding groove, the number of the limiting holes of each group is greater than or equal to the number of the limiting columns, preferably, the number of the limiting holes of each group=the number of the limiting columns, and each group of limiting holes can be in one-to-one corresponding connection with the limiting columns.

Further, the number of the limiting holes is more than 2, preferably 2-20.

Further, the distance between each group of limiting holes in the plurality of groups of limiting holes can be set according to the actual processing application scene, and is preferably set at equal distance or in a mode of reducing the distance from two ends to the middle.

Further, a scale is fixedly connected to one side surface of the sliding plate, which is close to the side wall of the sliding groove, preferably, the scales in the scale correspond to the plurality of groups of limiting holes formed in the upper surface of the sliding plate one by one (namely, each group of limiting holes is provided with a scale corresponding to the limiting holes, but the scale is not limited to the scale corresponding to the plurality of groups of limiting holes).

Further, the two side surfaces of the sliding plate, which are close to the side wall of the sliding groove, are fixedly connected with scales, preferably, the scales in the scales are in one-to-one correspondence with a plurality of groups of limiting holes formed in the upper surface of the sliding plate (namely, each group of limiting holes is provided with a scale corresponding to the limiting holes, but the scales are not limited to the scales corresponding to the plurality of groups of limiting holes).

Further, an indication block corresponding to the scale is fixedly connected to one side surface of the clamping head.

Further, the two side surfaces of the clamping head are fixedly connected with indication blocks corresponding to the scaleplates.

Further, a control piece for controlling the limiting column to move up and down is connected to the upper portion of the clamping head in a threaded mode.

Further, the control piece comprises a control screw rod and a control ring, a threaded hole corresponding to the control screw rod is formed in the clamping head along the direction perpendicular to the sliding plate, the control screw rod is connected with the clamping head through the threaded hole, the control ring is fixedly connected to the lower end of the control screw rod, and the control ring is located above the limiting column.

In some embodiments, the control ring is fixedly connected with the limit post, so that the limit post connected with the control ring is driven by the control screw to move up and down through the up and down rotation of the control screw to realize the extraction and insertion of the limit post into the limit hole.

In other embodiments, the spacing post is a T-shaped post, the outside of the small diameter post is sleeved with a spring, the diameter of the spring is smaller than the diameter of the large diameter post of the spacing post but larger than the diameter of the spacing hole (i.e. the spring is positioned between the small diameter post and the clamping head and the spring cannot be compressed into the spacing hole), and the upper end of the spring is fixedly connected with the lower surface of the large diameter post of the spacing post. Preferably, the length of the spring is shorter than the length of the cylinder portion of the stopper cylinder having a small diameter. In this embodiment, the control ring may not be connected to the limit post, but may push the limit post to move downward to be inserted into the limit hole after the control ring moves downward, and when the control ring moves upward, the control ring removes the pressure on the limit post, and pushes the limit post to move upward to be pulled out of the limit hole through spring reset.

The clamp comprises a clamping head, a rotating rod, a pressing ring, a stabilizing device, a through hole, a pressing ring and a pressing ring, wherein the stabilizing device comprises a hollow block, the rotating part, the pressing screw and the pressing ring, the hollow block is fixedly connected with one side surface of the clamping head, which is close to the side wall of the sliding groove, the rotating part is a combined body formed by connecting the rotating rod with the rotating plate in an L-shaped structure, the hollow block is provided with the through hole corresponding to the rotating rod of the rotating part or a blind hole with an upward opening in the vertical direction, the through hole or the blind hole of the hollow block is rotationally connected with the rotating rod of the rotating part, the rotating rod can be driven to rotate by rotating the rotating rod to take the rotating rod as the center, one end, far away from the rotating rod, of the rotating plate of the rotating part is provided with the through hole corresponding to the pressing screw in the vertical direction, the through hole wall of the pressing screw is provided with threads, the pressing screw is in threaded connection with the pressing ring at the lower end of the pressing screw.

Further, the rotating rod can be rotated to drive the rotating plate to rotate at any angle by taking the rotating rod as the center.

Further, the length of the rotating plate can be set according to the actual processing application scene, but the length of the rotating plate is required to be satisfied, and the pressing screw and the pressing ring are positioned right above the grinding wheel after the rotating rod is rotated.

Further, the fixed connection part of the clamping head and the hollow block is close to one end of the clamping head for clamping the grinding wheel, and preferably, the fixed connection part of the clamping head and the hollow block is positioned at the upper part of one side surface of the clamping head close to the side wall of the chute.

Further, the lower surface of the compression ring is fixedly connected with a pressing sheet, and preferably, the pressing sheet is made of rubber materials.

Further, each clamping head is fixedly connected with more than one group of stabilizing devices, preferably more than two groups of stabilizing devices, preferably, when the hollow blocks of the more than two groups of stabilizing devices are fixedly connected with the same clamping head, the hollow blocks are respectively fixedly connected with the surfaces of two sides of the clamping head, which are close to the side wall of the chute, and are uniformly distributed, for example, when the hollow blocks of four groups of stabilizing devices are fixedly connected with the same clamping head, the two hollow blocks are fixedly connected with the surface of one side of the clamping head, which is close to the side wall of the chute, and the other two hollow blocks are fixedly connected with the surface of the other side of the clamping head, which is close to the side wall of the chute, and are uniformly distributed.

Further, two groups of stabilizing devices are fixedly connected to each clamping head.

The beneficial effects of the utility model are as follows:

1. The clamping device of the clamp can quickly adjust the positions of the sliding plate and the clamping head, and adjust the relative positions of the sliding plate and the clamping head to adjust the clamping range of the clamp, so that the clamp has high clamping flexibility, can stably clamp workpieces with different specifications, saves the time for replacing the clamp caused by mismatching of the sizes, and further improves the production efficiency of grinding wheel machining.

2. The fixture is further provided with more than one group of stabilizing devices, so that the stability of the grinding wheel after clamping can be improved, and the condition that the processing is influenced due to the jumping of the grinding wheel is reduced.

Drawings

Fig. 1 shows a schematic perspective view of a clamp according to an embodiment of the utility model.

Fig. 2 shows a schematic view of the remainder of the structure of fig. 1 with the clamp head 22 removed from one side adjacent the motor 24.

Fig. 3 shows a schematic view of a part of the structure of the holding device 2 and the stabilizing device 3 according to an embodiment of the present utility model.

Fig. 4 shows a schematic view of a partly sectional structure of a clamping device 2 and a stabilizing device 3 according to an embodiment of the utility model.

Fig. 5 shows a block diagram of a pressing plate 33, a pressing screw 34, and a pressing ring 35 according to an embodiment of the present utility model. The figure shows that the device comprises a clamp seat 1, a clamping device 2, a sliding plate 21, a clamping head 22, a clamping head 23, a control part 231, a control screw rod 232, a control ring 24, a motor 25, a bidirectional threaded screw rod 26, a scale 27, an indication block 28, a limit column 29, a spring 3, a stabilizing device 31, a hollow block 32, a rotary rod 33, a pressing sheet 34, a pressing screw rod 35 and a pressing ring.

Detailed Description

The technique of the present utility model is further illustrated by the following examples. These examples are illustrative and exemplary of the utility model and are not intended to limit the scope of the utility model in any way.

A clamp for grinding wheel machining comprises a clamp seat 1 and a clamping device 2. The perspective view of the clamp is shown in fig. 1, and the schematic view of the rest of the structure of fig. 1 after removing the clamp head 22 adjacent to one side of the motor 24 is shown in fig. 2.

The upper surface of the clamp seat 1 is provided with a chute.

The clamping device 2 comprises two sliding plates 21, clamping heads 22, a motor 24, two bidirectional threaded screws 25 and limiting columns 28, wherein the two sliding plates 21 are in sliding connection with the inner wall of a sliding groove formed in the upper surface of the clamp seat 1, through holes corresponding to the bidirectional threaded screws 25 are formed in the two sliding plates 21 along the sliding direction of the sliding groove, threads formed in the through holes in the two sliding plates 21 can be matched with threads in different directions of the bidirectional threaded screws 25 respectively, the two sliding plates 21 are connected with the bidirectional threaded screws 25 through threads formed in the through holes in the two sliding plates, one end of each motor 24 is fixedly connected with one end of each bidirectional threaded screw 25 and fixed on the side wall of the clamp seat 1, the clamping heads 22 are in sliding connection with the upper surface of each sliding plate 21, the two limiting columns 28 are in sliding connection with the inner part of each clamping head 22 along the direction perpendicular to the sliding plates 21, and a plurality of groups of limiting holes capable of being spliced with the two limiting columns 28 are formed in the upper surface of the sliding plates 21. The schematic of the part structure of the clamping device is shown in fig. 3, and the schematic of the part cross-sectional structure of the clamping device is shown in fig. 4.

Each group of limiting holes comprises two limiting holes which are perpendicular to the bidirectional threaded screw rod 25 and symmetrically distributed on two sides of the bidirectional threaded screw rod 25, the number of the limiting holes can be set according to the actual application scene of the clamp, and at least 2 groups can be 11 groups as shown in fig. 2.

In this embodiment, the motor 24 drives the bidirectional threaded screw 25 to rotate, the bidirectional threaded screw 25 can drive the two sliding plates 21 to move in opposite directions (when clamping is required, the two sliding plates 21 move in opposite directions, when clamping is required to be released, the two sliding plates 21 move in opposite directions), the two sliding plates 21 drive the two clamping heads 22 on the upper surfaces of the two sliding plates to clamp or release the grinding wheels, and in addition, the positions of the clamping heads 22 on the sliding plates 21 can be adjusted by matching the limiting posts 28 in the clamping heads 22 with the limiting holes on the surfaces of the sliding plates 21, so that the transverse clamping range and the clamping stability of the clamping device 2 can be improved, and the clamping flexibility of the clamp on grinding wheels with different specifications can be improved.

Further, a control member 23 is in threaded connection with the upper portion of the clamping head 22, the control member 23 comprises a control screw 231 and a control ring 232, a threaded hole corresponding to the control screw 231 is formed in the clamping head 22 along the vertical direction, the control screw 231 is connected with the clamping head 22 through the threaded hole, the control ring 232 is fixedly connected with the lower end of the control screw 231, and the control ring 232 is located above the limiting column 28.

The limiting post 28 is a post with a T-shaped structure, the outside of the small-diameter post part is sleeved with a spring 29, the diameter of the spring 29 is smaller than that of the large-diameter post part of the limiting post 28 but larger than that of the limiting hole (namely, the spring 29 is positioned between the small-diameter post part and the clamping head 22 and can not be compressed into the limiting hole), the upper end of the spring 29 is fixedly connected with the lower surface of the large-diameter post part of the limiting post 28, and the length of the spring 29 is shorter than that of the small-diameter post part of the limiting post 28.

In this embodiment, when the control member 23 controls the limit post 28, the control screw 231 rotates to drive the control ring 232 to move up and down, when the control ring 232 moves downward, the control ring 232 can contact with the upper surface of the limit post 28 and press the limit post 28 to move downward to be inserted into the limit hole, meanwhile, the large-diameter cylinder part of the limit post 28 compresses the spring 29, when the control ring 232 moves upward to remove the extrusion of the limit post 28, the large-diameter cylinder part of the limit post 28 also removes the pressure on the spring 29, and the spring 29 drives the limit post 28 to reset, so that the limit post 28 is pulled out from the limit hole, thereby completing the whole control process of the control member 23 on the limit post 28.

Further, the two side surfaces of the sliding plate 21, which are close to the side wall of the sliding groove, are fixedly connected with the scales 26, the scales in the scales 26 are in one-to-one correspondence with the plurality of groups of limiting holes (one group of limiting holes corresponds to one scale) formed in the upper surface of the sliding plate 21, and the two sides of the clamping head 22 are fixedly connected with the indicating blocks 27 corresponding to the scales 26, so that when the clamping head 22 moves, the indicating blocks 27 can be matched with the scales 26 to carry out accurate adjustment.

Further, the grinding wheel processing clamp further comprises four groups of stabilizing devices 3, and each clamping head 22 is fixedly connected with two groups of stabilizing devices 3. The stabilizing device 3 comprises a hollow block 31, a rotating part 32, a pressing screw 34 and a pressing ring 35, wherein the hollow block 31 is fixedly connected with the upper part of one side surface of the clamping head 22, which is close to the side wall of the chute, and the fixed connection part is close to one end of the clamping head 22, which is used for clamping a grinding wheel, the rotating part 32 is a combined body which is connected with the rotating plate through an L-shaped structure by a rotating rod, the hollow block 31 is provided with a through hole corresponding to the rotating rod of the rotating part 32 along the vertical direction, the through hole of the hollow block 31 is rotationally connected with the rotating rod of the rotating part 32, the rotating plate can be driven to rotate at any angle by rotating the rotating rod to take the rotating rod as the center, the rotating plate of the rotating part 32 is provided with a through hole corresponding to the pressing screw 34 along the vertical direction, the through hole wall of the rotating plate of the rotating part 32 is provided with threads, the pressing screw 34 is in threaded connection with the through hole of the rotating plate of the rotating part 32, and the lower end of the pressing screw 34 is fixedly connected with the pressing ring 35.

In the two groups of stabilizing devices 3 fixedly connected to the same clamping head 22, two hollow blocks 31 are fixedly connected with two side surfaces of the clamping head 22, which are close to the side wall of the chute, respectively, and the fixedly connected parts are close to one end of the clamping head 22, which is used for clamping the grinding wheel, and are positioned at the upper parts of the two side surfaces.

In this embodiment, after the two clamping heads 22 clamp the grinding wheel, the rotating rod of the rotating component 32 can be rotated to enable the pressing ring 35 to be located above the grinding wheel, and then the pressing screw 34 is rotated, and the pressing screw 34 can drive the pressing ring 35 to press on the grinding wheel, so that the clamping stability effect of the grinding wheel is improved.

Further, the lower surface of the compression ring 35 is fixedly connected with the pressing sheet 33, the pressing sheet 33 is made of rubber materials, friction between the compression ring 35 and the grinding wheel can be reduced through the pressing sheet 33, and the protection effect on the grinding wheel is improved. The structure of the pressing piece 33, the pressing screw 34, and the pressing ring 35 is shown in fig. 5.

When the grinding wheel needs to be clamped, the grinding wheel is firstly placed in the middle of a chute on the clamp seat 1, the motor 24 is turned on, the motor 24 drives the bidirectional threaded screw 25 to rotate, the bidirectional threaded screw 25 drives the two sliding plates 21 to move oppositely, and the sliding plates 21 further drive the clamping heads 22 to move oppositely to clamp the grinding wheel. When the clamping range needs to be adjusted, the control screw 231 is rotated to enable the control screw 231 to drive the control ring 232 to move upwards, then the control ring 232 loses control over the limiting column 28, the spring 29 drives the limiting column 28 to reset, the limiting column 28 moves out of the limiting hole in the upper surface of the sliding plate 21, then the clamping head 22 slides in the sliding plate 21 to a target position, accurate adjustment is performed through the indication block 27 in cooperation with the scale 26 when the clamping head 22 slides, after the clamping head 22 is adjusted to the target position, the control screw 231 is rotated to enable the control screw 231 to drive the control ring 232 to move downwards, the control ring 232 extrudes the limiting column 28, and the limiting column 28 is inserted into the limiting hole in the upper surface of the sliding plate 21, so that the clamping range adjustment is completed. When the two clamping heads 22 clamp the grinding wheel, the rotary rod of the rotary part 32 can be rotated in the hollow block 31, so that the rotary plate drives the pressing screw 34 and the pressing ring 35 to rotate above the grinding wheel, and then the pressing screw 34 is rotated, so that the pressing screw 34 drives the pressing ring 35 and the pressing piece 33 to press above the grinding wheel, and the clamping stability of the grinding wheel is improved.

It should be noted that the above-described embodiments are only for explaining the present utility model and do not constitute any limitation of the present utility model. The present utility model has been described in terms of embodiments, and is to be understood as being in the nature of words of description and illustration, rather than words of limitation. Modifications may be made to the utility model as defined in the appended claims, and the utility model may be modified without departing from the scope and spirit of the utility model.

Claims (22)

1. The clamp for grinding wheel machining is characterized by comprising a clamp seat (1) and a clamping device (2);

wherein, the upper surface of the clamp seat (1) is provided with a chute;

The clamping device (2) comprises at least two sliding plates (21), clamping heads (22), a motor (24), two bidirectional threaded screws (25) and limiting columns (28), wherein the sliding plates (21) are in sliding connection with sliding grooves formed in the upper surface of a clamp seat (1), through holes corresponding to the two bidirectional threaded screws (25) are formed in the sliding plates (21) along the sliding direction of the sliding grooves, threads matched with the two bidirectional threaded screws (25) are formed in the walls of the through holes, the sliding plates (21) are connected with the two bidirectional threaded screws (25) through the threads formed in the walls of the through holes, the motor (24) is fixedly connected with one end of the two bidirectional threaded screws (25), the clamping heads (22) are connected to the upper surface of each sliding plate (21) in a sliding mode, the limiting columns (28) are connected to the inner portions of the clamping heads (22) in a sliding mode along the direction perpendicular to the sliding plates (21), and limiting holes capable of being spliced with the limiting columns (28) are formed in the upper surface of the sliding plates (21).

2. The clamp according to claim 1, characterized in that the number of the sliding plates (21) is two, and the threads arranged on the inner through hole walls of the two sliding plates (21) can be respectively matched with the threads in different directions of the bidirectional threaded screw (25);

and/or the motor (24) is fixed on the side wall of the clamp seat (1);

And/or more than two limit posts (28) are arranged.

3. The clamp according to claim 2, characterized in that the number of limit posts (28) is a multiple of 2.

4. The clamp according to claim 2, characterized in that the limit posts (28) are symmetrically distributed on both sides of the bidirectional threaded screw (25) along a direction perpendicular to the extension direction of the bidirectional threaded screw (25).

5. The clamp according to claim 2, wherein the limiting holes comprise a plurality of groups of limiting holes arranged along the sliding direction of the sliding chute, and the number of the limiting holes in each group is greater than or equal to the number of the limiting posts (28).

6. The fixture of claim 5, wherein the number of sets of limiting holes is greater than 2.

7. The fixture of claim 6, wherein the number of sets of limiting holes is 2-20 sets.

8. The fixture according to claim 5, wherein the surface of one or both sides of the sliding plate (21) close to the side wall of the chute is fixedly connected with a scale (26).

9. The fixture according to claim 8, wherein scales in the scale (26) are in one-to-one correspondence with a plurality of groups of limiting holes formed in the upper surface of the sliding plate (21).

10. The clamp according to claim 9, characterized in that an indication block (27) corresponding to the scale (26) is fixedly connected to one or both side surfaces of the clamping head (22).

11. The clamp according to any one of claims 1-10, characterized in that a control member (23) for controlling the up-and-down movement of the limit post (28) is screwed on the upper part of the clamping head (22).

12. The clamp according to claim 11, characterized in that the control member (23) comprises a control screw (231) and a control ring (232), a threaded hole corresponding to the control screw (231) is formed in the clamping head (22) along the direction perpendicular to the sliding plate (21), the control screw (231) is connected with the clamping head (22) through the threaded hole, the control ring (232) is fixedly connected to the lower end of the control screw (231), and the control ring (232) is located above the limit column (28).

13. The clamp according to claim 12, characterized in that the control ring (232) is fixedly connected with the limit post (28);

Or, the limit post (28) is a post with a T-shaped structure, a spring (29) is sleeved outside the post part with a small diameter of the limit post (28), the diameter of the spring (29) is smaller than that of the post part with a large diameter of the limit post (28) but larger than that of the limit hole, and the upper end of the spring (29) is fixedly connected with the lower surface of the post part with a large diameter of the limit post (28).

14. A clamp according to claim 13, characterized in that the length of the spring (29) is shorter than the length of the cylinder portion of small diameter of the limit post (28).

15. The clamp according to any one of claims 1-10 and 12-13, further comprising a stabilizing device (3), wherein the stabilizing device (3) comprises a hollow block (31), a rotating part (32), a pressing screw (34) and a pressing ring (35), the hollow block (31) is fixedly connected with one side surface of the clamping head (22) close to the side wall of the sliding groove, the rotating part (32) is a combined body formed by connecting a rotating rod and the rotating plate in an L-shaped structure, the hollow block (31) is provided with a through hole or a blind hole which is opened upwards and corresponds to the rotating rod of the rotating part (32) along the vertical direction, the through hole or the blind hole of the hollow block (31) is rotationally connected with the rotating rod of the rotating part (32), the rotating plate of the rotating part (32) can be driven to rotate by rotating the rotating rod around the rotating rod, a through hole corresponding to the pressing screw (34) is formed in the vertical direction at one end far away from the rotating rod, the pressing screw (34) is provided with threads, and the pressing ring (35) is fixedly connected with the lower end of the pressing screw (34).

16. The clamp according to claim 15, characterized in that the fixed connection of the clamping head (22) to the hollow block (31) is near one end of the clamping head (22) for clamping the grinding wheel.

17. The clamp according to claim 16, characterized in that the fixed connection part of the clamping head (22) and the hollow block (31) is positioned at the upper part of one side surface of the clamping head (22) close to the side wall of the chute.

18. The clamp according to claim 16, characterized in that the lower surface of the pressure ring (35) is fixedly connected with a pressing sheet (33).

19. The clamp according to claim 18, characterized in that the press sheet (33) is made of rubber material.

20. The fixture according to any one of claims 16-19, wherein each clamping head (22) is fixedly connected with more than one group of stabilizing devices (3).

21. The clamp according to claim 20, characterized in that more than two sets of stabilizing devices (3) are fixedly connected to each clamping head (22).

22. The clamp according to claim 21, characterized in that when the hollow blocks (31) of more than two groups of stabilizing devices (3) are fixedly connected with the same clamping head (22), the hollow blocks (31) are fixedly connected with the surfaces of the two sides of the clamping head (22) close to the side wall of the chute respectively and are uniformly distributed.