TWI840196B - Composite clamp structure - Google Patents

Abstract

A composite clamp structure includes: a clamping seat, a lower clamping claw set and a finger-shaped clamping claw set. The lower clamping claw set has a synchronous clamping effect, which can truly center and clamp the workpiece, and then use the finger-shaped clamping claw set to press the workpiece against the clamping seat. This can not only quickly center and clamp the workpiece to ensure the roundness of the processing, but also avoid the deformation of the workpiece clamping and the sliding displacement between the lower clamping claws during processing, which helps to improve the workpiece processing efficiency and the quality of the finished product.

Description

The structure of the composite clamp

The present invention relates to a clamp structure of a processing machine, in particular to a composite clamp structure having two clamping and positioning effects.

Machine tools such as lathes, milling machines, and drilling machines require a chuck to clamp the workpiece on the lathe head or workbench. The chuck commonly used in machine tools currently includes a chuck body, several jaw seats embedded in one end of the chuck body, and several jaws installed on each jaw seat. Each jaw seat is equally embedded in one end of the chuck body and arranged in a radial shape. In addition, a detent is provided at the center of the end of the chuck body opposite to the jaw seat. The detent is linked to each jaw seat. When the workpiece is to be clamped, the detent is controlled to be pulled toward the end opposite to the jaw, so that each jaw seat and the jaw can be synchronously displaced toward the center, and the workpiece is clamped by the jaw.

However, since each clamping jaw is in line contact with the cylindrical workpiece, in order to enable each clamping jaw to clamp the workpiece at the same time and prevent the two from slipping during the processing, the clamping force of the clamping jaw is designed to be quite large. In this way, it can be applied to solid or thick-walled workpieces. However, if it clamps thin-walled pipes, it is easy to cause uneven force on the pipe wall (because the end of the clamping jaw is in line contact with the pipe) and deformation, which is easy to produce defective products. Therefore, the existing machine tool chuck still needs to be further improved.

In view of this, the inventor has been engaged in the manufacturing, development and design of related products for many years. After careful design and careful evaluation for the above-mentioned goals, he finally obtained this invention which is truly practical.

The technical problem that this invention aims to solve is to provide a composite clamp structure with two clamping and positioning effects in view of the above-mentioned deficiencies of the existing technology.

The structure of the composite clamp includes: a clamp seat, a lower draw groove chamber and a finger-shaped groove chamber are arranged in sequence from the inside to the outside at the rear end of the clamp seat, and a central through hole is set through the front end. The front end of the clamp seat is radially provided with a plurality of staggered lower draw grooves and finger-shaped grooves with the central through hole as the center. The lower draw groove is not parallel to the central through hole and is inwardly tilted. The finger-shaped groove is parallel to the central through hole. The outer diameter of the clamp seat is provided with a plurality of limit holes and are respectively connected to the finger-shaped grooves. The limit holes are all provided with a limit top column. The rear end of the clamp seat is further provided with a rear cover plate, and a through hole is set in the center of the rear cover plate. Hole; a pull-down clamping claw assembly, comprising a plurality of pull-down main claws, a plurality of pull-down claw bodies arranged at the front ends of the pull-down main claws, a pull-down middle core linked to the pull-down main claws, and a pull-down middle core pull rod connected to the pull-down middle core, the pull-down main claws are respectively slidably arranged in the pull-down groove, and the outer periphery of the pull-down main claws is concavely provided with a fitting groove, the pull-down middle core is accommodated between the pull-down groove chamber and the finger-shaped groove chamber, and has a hollow column and a fitting plate arranged around the outer periphery of the hollow column, the fitting plate is connected and connected with the fitting groove of the pull-down main claw, and one end of the pull-down middle core pull rod is connected to the middle A finger-shaped clamping claw assembly comprises a plurality of finger-shaped main claws, a plurality of pressure claw bodies arranged under one end of the finger-shaped main claws, a finger-shaped middle core plate for linking the finger-shaped main claws, a finger-shaped middle core and a finger-shaped middle core sleeve of the finger-shaped middle core plate, and an outer nut for connecting and pulling the finger-shaped middle core sleeve. The finger-shaped main claws are respectively slidably arranged in the finger-shaped grooves, and the other end of the finger-shaped main claws is connected to the finger-shaped middle core plate. A guide groove is concavely arranged on the outer diameter of the finger-shaped main claw. The guide groove has a swinging section and a linear section, and is connected to the guide groove through the limit top column and the guide groove. The groove cooperates with the finger-shaped main claw to guide the finger-shaped main claw to produce a rotating and linear displacement state. The lower pressing claw body has a pressing convex portion. The finger-shaped core plate is accommodated in the finger-shaped groove chamber. The periphery thereof is convexly provided with a plurality of connecting portions for the assembly and connection of the finger-shaped main claw. The finger-shaped core plate has a central through hole. One end of the finger-shaped core is tightly fitted in the central through hole, and the other end passes through the central through hole to be combined with the finger-shaped core sleeve. The finger-shaped core is penetrated by a shaft hole at both ends to be assembled outside the hollow column of the lower pull core, and the finger-shaped core sleeve can be displaced along the through hole.

Preferably, the outer diameter of the clamp seat is provided with a plurality of screw holes, the screw holes are respectively connected with the pull-down groove, the outer diameter of the pull-down main claw is provided with a limit long hole along the displacement direction, and the screw holes are respectively screwed with a stop screw, and the stop screw and the limit long hole are used to limit the positioning, thereby limiting the displacement path of the pull-down main claw.

Preferably, a metal seat is arranged outside the center through hole at the front end of the clamp, and a center positioning groove is arranged at the front end of the metal seat.

Preferably, the inner diameter of the hollow column in the pull-down core has a large diameter section and a small diameter section, the large diameter section is provided with an internal thread, one end of the pull rod of the pull-down core forms a large head section and is fixed with a screw seat, and then the pull rod of the pull-down core is passed through the inner diameter of the hollow column, and the screw seat is connected with the internal thread of the large diameter section by screws, and the end of the large diameter section is further closed by a screw cover screw.

Preferably, one end of the finger-shaped main claw is assembled with the pressing claw body by screwing, and the other end is provided with a screw. The connecting part around the finger-shaped core plate is provided with a combination hole, and the combination hole is used for the screw of the finger-shaped main claw to be fixed. The outer diameter of the finger-shaped core forms an arc segment and a thread segment, and the arc segment is closely matched with the central through hole of the finger-shaped core plate, and the central through hole is further provided with a finger-shaped core cover to fix the finger-shaped core. The inner thread section of the finger-shaped core is positioned to limit the positioning, and the thread section of the finger-shaped core is protruding outside the central through hole. The inner diameter of the finger-shaped core sleeve has an inner thread section and an annular protrusion. One end of the outer nut forms an annular protrusion to abut against the annular protrusion for positioning. The inner thread section of the finger-shaped core sleeve is screwed to the thread section of the finger-shaped core to further clamp and fix the outer nut. The outer nut is provided with an axial through hole for the pull rod of the pull-down core to pass through.

Preferably, the rear cover plate is provided with a plurality of limiting posts corresponding to the pull-down groove screws, and a plurality of limiting grooves corresponding to the finger-shaped grooves.

Compared with the effects of the prior art: the composite clamping seat of the present invention has a synchronous clamping effect through the pull-down clamping claw set, which can truly center and clamp the workpiece, and then use the finger-shaped clamping claw set to press the workpiece against the clamping seat. This can not only quickly center and clamp the workpiece to ensure the true roundness of the processing, but also avoid the deformation of the workpiece clamping and the sliding displacement between the pull-down claw bodies during processing, which helps to improve the workpiece processing efficiency and the quality of the finished product.

[The present invention]

10: Clamp seat

11: Pull-down slot chamber

12: Finger groove room

13: Center perforation

14: Pull-down channel

15: Finger-shaped groove

16: Screw hole

17: Limiting hole

161: Stop screw

171: Limiting top column

18: Seat Gold

181: Center positioning groove

19: Rear cover

191: Penetration hole

192: Limiting column

193: Limiting groove

20: Pull-down clamp assembly

21: Pull down the main claw

211:Matching slot

212: Limiting long hole

22: Pull-down claw body

23: Pull down Zhongren

231:Hollow column

232: Fitting plate

233: Main diameter section

234: Small path section

235: Arc-shaped notch

24: Pull down the middle pull rod

241: Big header

25: Screw seat

26: Screw cover

30: Finger-shaped clamp set

31: Finger-shaped main claw

311: Screw

312: Guide groove

313: Pendulum section

314: Linear segment

315: Nut

316: Bearing parts

32: Press down the claw body

321: Pressed convex part

33: Finger-shaped middle core board

331: Connection part

332: Combination hole

333: Center hole

34: Finger shape and benevolence

341: arc segment

342: Threaded section

343: Axle hole

35: Finger-shaped middle-core sleeve

351: Internal thread section

352: Ring-shaped convex part

36: External nut

361: convex part

362: Axial perforation

37: Finger shape middle cover

40: Workpiece

41: Arc plate

42: Base plate

43: Ring groove

[Figure 1] is a three-dimensional diagram of the present invention.

[Figure 2] is an exploded view of the present invention.

[Figure 3] is a view before the invention.

[Figure 4] is a cross-sectional view of the present invention corresponding to the A-A section line of Figure 3.

[Figure 5] is a cross-sectional view of the present invention corresponding to the B-B section line of Figure 4.

[Figure 6] is a schematic diagram of the workpiece of the present invention being placed into the composite fixture.

[Figure 7] is a cross-sectional view of the clamping claw assembly of the present invention clamping a workpiece.

[Figure 8] is a front view of the clamping claw assembly of the present invention clamping a workpiece.

[Figure 9] is a schematic diagram of the finger-shaped main claw of the present invention moving along the guide groove.

[Figure 10] is a cross-sectional view of the finger-shaped clamp assembly of the present invention pressing a workpiece.

[Figure 11] is a front view of the finger-shaped clamp assembly of the present invention pressing a workpiece.

In order to enable the review committee to have a deeper understanding and knowledge of the purpose, features and effects of this invention, please refer to the [Simple Diagram Description] for details as follows:

First, please refer to the structure of a composite clamp as shown in Figures 1, 2, 3, and 4, which includes: a clamp seat 10, a pull-down clamping claw assembly 20, and a finger-shaped clamping claw assembly 30. The rear end of the clamp seat 10 is provided with a pull-down groove chamber 11 and a finger-shaped groove chamber 12 in sequence from the inside to the outside, and then a central through hole 13 is penetrated through the front end. The front end of the clamp seat 10 is radially provided with a plurality of staggered pull-down grooves 14 and finger-shaped grooves 15 with the central through hole 13 as the center. The pull-down grooves 14 are not parallel to the central through hole 13 and are inwardly tilted. The finger-shaped grooves 15 are parallel to the central through hole 13. 13 is parallel to the front end of the clamp 10, and the outer diameter of the clamp 10 is provided with a plurality of screw holes 16 and a limiting hole 17. The screw holes 16 are respectively communicated with the pull-down groove 14, and a stop screw 161 is respectively locked in the screw hole 16. The limiting hole 17 is respectively communicated with the finger-shaped groove 15, and a limiting top column 171 is respectively locked in the limiting hole 17. A seat 18 is assembled outside the central through hole 13 at the front end of the clamp 10, and a central positioning groove 181 is arranged at the front end of the seat 18. A rear cover plate 19 is further assembled at the rear end of the clamp 10, and a through hole 19 is arranged in the center of the rear cover plate 19. 1, a plurality of limit posts 192 are screwed corresponding to the pull-down channel 14, and a plurality of limit grooves 193 are provided corresponding to the finger-shaped channel 15; the pull-down clamping claw assembly 20 has a plurality of pull-down main claws 21, a plurality of pull-down claw bodies 22 assembled at the front ends of the pull-down main claws 21, a pull-down center core 23 linked to the pull-down main claws 21, and a pull-down center core pull rod 24 connected to the pull-down center core 23, the pull-down main claws 21 are respectively slidably assembled in the pull-down channel 14, and the outer diameter of the pull-down main claws 21 are all concavely provided with a fitting groove 211, and the outer diameter of the pull-down main claws 21 is further provided with a fitting groove 211. A limiting long hole 212 is provided along the displacement direction. The pull-down core 23 is accommodated between the pull-down groove chamber 11 and the finger-shaped groove chamber 12. It has a hollow column 231 and a fitting plate 232 arranged around the outer periphery of the hollow column 231. The inner diameter of the hollow column 231 has a large diameter section 233 and a small diameter section 234. The large diameter section 233 is provided with an internal thread. The fitting plate 232 is connected and connected with the fitting groove 211 of the pull-down main claw 21. One end of the pull-down core rod 24 forms a large head section 241 and is fixed with a screw seat 25. Then the pull-down core rod 24 is fixed. The finger-shaped clamping claw assembly 30 is provided through the inner diameter of the hollow column 231 and connected with the inner thread of the large diameter section 233 by the screw seat 25, and the end of the large diameter section 233 is screwed by a screw cover 26; the finger-shaped clamping claw assembly 30 has a plurality of finger-shaped main claws 31, a plurality of pressure claw bodies 32 assembled under one end of the finger-shaped main claws 31, a finger-shaped middle core plate 33 linked to the finger-shaped main claws 31, a finger-shaped middle core 34 and a finger-shaped middle core sleeve 35 connected to the finger-shaped middle core plate 33, and an outer nut 36 connected to pull the finger-shaped middle core sleeve 35, the finger-shaped main claws 31 are respectively The finger-shaped main claw 31 is slidably assembled in the finger-shaped groove 15, and one end of the finger-shaped main claw 31 is assembled with the lower pressing claw body 32 by screwing, and the other end is provided with a screw rod 311, and a guide groove 312 is recessed in the outer diameter of the finger-shaped main claw 31, and the guide groove 312 has a swing section 313 and a linear section 314, and cooperates with the guide groove 312 through the limit top column 171, thereby guiding the finger-shaped main claw 31 to generate a swing rotation and a linear displacement action state, the lower pressing claw body 32 has a pressing protrusion 321, and the finger-shaped middle core plate 33 is accommodated in the finger-shaped groove chamber 12, a plurality of connecting parts 331 are convexly provided on the periphery thereof, each of the connecting parts 331 is provided with a combination hole 332 for the screw rod 311 of the finger-shaped main claw 31 to be assembled and connected, and the finger-shaped core plate 33 has a central through hole 333, the outer diameter of the finger-shaped core 34 forms an arc segment 341 and a thread segment 342, the arc segment 341 is closely matched with the central through hole 333 of the finger-shaped core plate 33, and the thread segment 342 passes through the central through hole 333, and the central through hole 333 is further provided with a finger-shaped core cover 37 to limit the positioning of the finger-shaped core 34 , and the finger-shaped core 34 is penetrated by an axial hole 343 at both ends to be assembled on the outside of the hollow column 231 of the pull-down core 23. The inner diameter of the finger-shaped core sleeve 35 has an inner thread section 351 and an annular protrusion 352. The outer nut 36 forms an annular protrusion 361 at one end to abut against the annular protrusion 352 for positioning, and then the inner thread section 351 of the finger-shaped core sleeve 35 is screwed to the thread section 342 of the finger-shaped core 34 to further clamp and fix the outer nut 36. The outer nut 36 is provided with an axial through hole 362 for the pull-down core pull rod 24 to pass through.

The structure is shown in Figures 1 to 5. The main pull-down claw 21 of the pull-down clamping claw assembly 20 is slidably displaced in each of the pull-down grooves 14 of the clamping seat 10, and is respectively locked into a stop screw 16 and guided by a limit long hole 212 of the outer diameter of the main pull-down claw 21. A pull-down claw body 22 is assembled at one end protruding from the outside of the clamping seat 10. The pull-down center rod 24 is first assembled in the hollow column 231 of the pull-down center with the screw seat 25 and the screw cover 26, and then the pull-down center 23 is assembled into the clamping seat 10. The bottom groove chamber 11 and the finger groove chamber 12 of the seat 10 are connected to the engaging plate 232 on the outer periphery of the bottom pull core 23 and the engaging groove 211 of the bottom pull main claw 21, so that the bottom pull core 23 is moved forward and backward to drive the bottom pull main claw 21 to slide along the bottom pull groove 14, and the workpiece is clamped and released through the bottom pull claw body 22. The finger main claw 31 of the finger clamping claw assembly 30 is penetrated through the screw 311 and is provided in each of the assembly holes 332 of the finger center core plate 33 at the connecting portion 331. The screw 311 is fixed by at least two nuts 31. A bearing 316 is matched and fixed to the assembly hole 332 so that the finger-shaped main claw 31 can rotate freely on the finger-shaped core plate 33. Then, the finger-shaped core 34, the finger-shaped core sleeve 35 and the outer nut 36 are assembled in the central through hole 333 of the finger-shaped core plate 33. Then, the finger-shaped core plate 33 is assembled into the finger-shaped groove chamber 12 of the clamp 10. The finger-shaped main claw 31 is aligned and assembled in each of the finger-shaped grooves 15 and guided by the limit top column 171 locked in the limit hole 17 and the guide groove 312 of each of the finger-shaped main claws 31. The finger-shaped main claw 31 is protruding from one end of the clamp 10 and is assembled with a pressing claw body 32, and the finger-shaped core 34 is assembled outside the hollow column 231 of the pull-down core 23, and the axial through hole 362 of the outer nut 36 is used to provide the pull-down core pull rod 24 to pass through, and finally the rear cover plate 19 is covered and assembled on the rear end of the clamp 10, further restricting the pull-down clamp claw assembly 20 and the finger-shaped clamp claw assembly 30 in the clamp 10, and allowing the finger-shaped core sleeve 35 to move along the through hole 191, thereby completing the assembly of the composite clamp.

To further explain, the engagement plate 232 of the pull-down core 23 is further provided with an arc-shaped notch 235, and the arc-shaped notch 235 is used to conduct the pull-down groove chamber 11, so that the pull-down main claws 21 can sequentially pass through the arc-shaped notch 235 and be assembled into the pull-down groove chamber 11, and the pull-down core 23 is rotated to assemble and connect the engagement plate 232 to the engagement groove 211 of each pull-down main claw 21 one by one.

The actual use of the structure is shown in Figures 6, 7 and 8. The composite clamp is used to clamp a workpiece 40 of a specific shape. The workpiece 40 is a hollow tube and is connected to a bottom plate 42 at one end through a plurality of arc plates 41. An annular groove 43 is formed between the bottom plate 42 and the tube. When the workpiece 40 is actually clamped, the bottom plate 42 is placed inwardly at the center of the clamping seat 10 and aligned with the center positioning groove 1 of the base 18. 81, and then the pull-down center core 23 is pulled backward by the pull-down center core pull rod 24, so that the pull-down main claw 21 is synchronously displaced along the pull-down groove 14, and further the bottom plate 42 of the workpiece 40 is clamped by the pull-down claw body 22, and then, as shown in Figures 9, 10, and 11, the finger-shaped center core plate 33 is then pulled backward by the outer nut 36, and the finger-shaped main claw 31 is further linked to move along the finger-shaped When the groove 15 is displaced and the finger-shaped main claw 31 is displaced, the swinging section 313 of the guide groove 312 will first be displaced along the limit top column 171 to generate a rotational action, so that the pressing claw body 32 under the finger-shaped main claw 31 will first be rotated to synchronously screw the pressing protrusion 321 into the annular groove 43 of the workpiece 40, and then the linear section 314 will be displaced along the limit top column 171 to form a linear action, so that the pressing protrusion screwed into the annular groove 43 321 can then be synchronously pressed against the bottom plate 42, so that the bottom plate 42 of the workpiece 40 can be firmly clamped on the lower pressure claw body 32 and the base metal 18. Thus, through the clamping of the lower clamping claw assembly 20 and the pressing of the finger clamping claw assembly 30, the workpiece 40 can be stably clamped and fixed by the clamp, and at the same time, the workpiece 40 can be prevented from being deformed by clamping, which helps to improve the stability and precision of the workpiece 40 processing.

The structure of the above-mentioned specific embodiment can obtain the following benefits: the composite clamping seat of the present invention has a synchronous clamping effect through the pull-down clamping claw set 20, and the workpiece 40 is indeed centered and clamped in position, and then the finger-shaped clamping claw set 30 is used to press the workpiece 40 against the clamping seat 10, thereby not only quickly centering and clamping the workpiece 40 to ensure the true roundness of the processing, but also avoiding the clamping deformation of the workpiece 40 and the sliding displacement between the pull-down claw body 22 during processing, which helps to improve the processing efficiency of the workpiece 40 and the quality of the finished product.

In summary, this invention has indeed achieved a breakthrough structural design and has improved invention content. At the same time, it can achieve industrial applicability and progress. Moreover, this invention has not been seen in any publication and is also novel. It should comply with the relevant provisions of the Patent Law. Therefore, we have filed an invention patent application in accordance with the law and pleaded with the Jun Bureau Review Committee to grant legal patent rights. We are very grateful.

However, the above is only a preferred embodiment of the present invention and should not be used to limit the scope of implementation of the present invention; that is, all equivalent changes and modifications made according to the scope of the patent application of the present invention should still fall within the scope of the patent of the present invention.

10: Clamp seat

11: Pull-down slot chamber

12: Finger groove room

13: Center perforation

14: Pull-down channel

15: Finger-shaped groove

16: Screw hole

17: Limiting hole

161: Stop screw

171: Limiting top column

18: Seat Gold

181: Center positioning groove

19: Rear cover

191: Penetration hole

192: Limiting column

193: Limiting groove

20: Pull-down clamp assembly

21: Pull down the main claw

211:Matching slot

212: Limiting long hole

22: Pull-down claw body

23: Pull down Zhongren

231:Hollow column

232: Fitting plate

233: Main diameter section

235: Arc-shaped notch

24: Pull down the middle pull rod

241: Big header

25: Screw seat

26: Screw cover

30: Finger-shaped clamp set

31: Finger-shaped main claw

311: Screw

312: Guide groove

313: Pendulum section

314: Linear segment

315: Nut

32: Press down the claw body

321: Pressed convex part

33: Finger-shaped middle core board

331: Connection part

332: Combination hole

333: Center hole

34: Finger shape and benevolence

341: arc segment

342: Threaded section

343: Axle hole

35: Finger-shaped middle-core sleeve

351: Internal thread section

352: Ring-shaped convex part

36: External nut

361: convex part

362: Axial perforation

37: Finger shape middle cover

Claims (6)

A composite clamp structure, comprising: A clamping seat, the rear end of the clamping seat is provided with a lower pull groove chamber and a finger-shaped groove chamber in sequence from the inside to the outside, and then a central through hole is set through the front end. The front end of the clamping seat is radially provided with a plurality of staggered lower pull grooves and finger-shaped grooves with the central through hole as the center. The lower pull groove is not parallel to the central through hole and is inwardly tilted. The finger-shaped groove is parallel to the central through hole. The outer diameter of the clamping seat is provided with a plurality of limiting holes and are respectively communicated with the finger-shaped grooves. The limiting holes are all provided with a limiting top column. The rear end of the clamping seat is further provided with a rear cover plate, and a through hole is set in the center of the rear cover plate; a lower pull clamping claw assembly, having a plurality of lower pull A main claw, a plurality of lower pull claw bodies assembled at the front end of the lower pull main claw, a lower pull core connected to the lower pull main claw, and a lower pull core pull rod connected to the lower pull core. The lower pull main claws are slidably assembled in the lower pull groove, and the outer periphery of the lower pull main claws is concavely provided with a fitting groove. The lower pull core is accommodated between the lower pull groove chamber and the finger-shaped groove chamber, and has a hollow column and a fitting plate arranged around the outer periphery of the hollow column. The fitting plate is connected to the fitting groove of the lower pull main claw. One end of the lower pull core pull rod is connected to the hollow column, and the other end passes through the hollow column; A finger-shaped clamping claw assembly has a plurality of finger-shaped main claws, a plurality of pressure claw bodies arranged under one end of the finger-shaped main claws, a finger-shaped middle core plate that links the finger-shaped main claws, a finger-shaped middle core and a finger-shaped middle core sleeve that are connected to the finger-shaped middle core plate, and an outer nut that is connected to pull the finger-shaped middle core sleeve. The finger-shaped main claws are slidably arranged in the finger-shaped grooves, and the other ends of the finger-shaped main claws are connected to the finger-shaped middle core plate. A guide groove is recessed in the outer diameter of the finger-shaped main claw. The guide groove has a swing section and a linear section, and cooperates with the guide groove through the limit top column to guide The finger-shaped main claw generates a rotating and linear displacement motion state. The lower pressing claw body has a pressing convex portion. The finger-shaped core plate is accommodated in the finger-shaped slot chamber. The periphery of the finger-shaped core plate is convexly provided with a plurality of connecting portions for the assembly and connection of the finger-shaped main claw. The finger-shaped core plate has a central through hole. One end of the finger-shaped core is tightly fitted in the central through hole, and the other end passes through the central through hole to be combined with the finger-shaped core sleeve. The finger-shaped core is penetrated by a shaft hole at both ends to be assembled outside the hollow column of the lower pull core, and the finger-shaped core sleeve can be displaced along the through hole. The structure of the composite clamp as described in claim 1, wherein the outer diameter of the clamp seat is provided with a plurality of screw holes, the screw holes are respectively connected to the pull-down groove, the outer diameter of the pull-down main claw is provided with a limit long hole along the displacement direction, and the screw holes are respectively screwed with a stop screw, and the stop screw and the limit long hole are used to limit the positioning, thereby limiting the displacement path of the pull-down main claw. The structure of the composite clamp as described in claim 1, wherein a metal seat is arranged outside the center through hole at the front end of the clamp, and a center positioning groove is arranged at the front end of the metal seat. The structure of the composite clamp as described in claim 1, wherein the inner diameter of the hollow column of the pull-down core has a large diameter section and a small diameter section, the large diameter section is provided with an internal thread, one end of the pull rod of the pull-down core forms a large head section and is fixed with a screw seat, and then the pull rod of the pull-down core is passed through the inner diameter of the hollow column, and the screw seat is connected with the internal thread of the large diameter section by screws, and the end of the large diameter section is further closed by a screw cover. The structure of the composite clamp as described in claim 1, wherein one end of the finger-shaped main claw is assembled with the pressing claw body by screwing, and the other end is provided with a screw rod, and the connecting part around the finger-shaped core plate is provided with a combination hole, and the combination hole is used for the screw rod of the finger-shaped main claw to be screwed and fixed, and the outer diameter of the finger-shaped core forms an arc surface section and a threaded section, and the arc surface section is closely matched with the central through hole of the finger-shaped core plate, and the central through hole is further provided with a finger-shaped The core cover restricts the finger-shaped core, and the threaded section of the finger-shaped core is protruding outside the central through hole. The inner diameter of the finger-shaped core sleeve has an inner threaded section and an annular protrusion. One end of the outer nut forms an annular protrusion that abuts against the annular protrusion for positioning. The inner threaded section of the finger-shaped core sleeve is screwed together with the threaded section of the finger-shaped core to further clamp and fix the outer nut. The outer nut is provided with an axial through hole for the pull rod of the pull-down core to pass through. The structure of the composite clamp as described in claim 1, wherein the rear cover plate is provided with a plurality of limit posts corresponding to the pull-down channel screws, and a plurality of limit grooves corresponding to the finger-shaped channel.

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