CN221621938U

CN221621938U - Tool clamp for armature

Info

Publication number: CN221621938U
Application number: CN202322973957.1U
Authority: CN
Inventors: 郭义成
Original assignee: Hangzhou Zhuangyu Machinery Co ltd
Current assignee: Hangzhou Zhuangyu Machinery Co ltd
Priority date: 2023-11-03
Filing date: 2023-11-03
Publication date: 2024-08-30
Anticipated expiration: 2033-11-03

Abstract

The utility model discloses a fixture clamp for a lug, and relates to the technical field of fixture clamps, comprising a support frame, wherein two sides of the support frame are respectively provided with a clamping seat and a fixing seat which are perpendicular to the support frame; the fixed seat is provided with a fixed base; a fixed block is arranged at the center of the fixed base; the front end of the fixed base is embedded with a fixing device; the clamping seat is provided with a clamping device which is positioned on the same axis with the fixing device; one side of the clamping seat, which is far away from the clamping device, is provided with a pushing device which can push the clamping device to move back and forth. According to the structure design of the fixture clamp for the armature, the problem that the armature is deviated due to the fact that the armature is subjected to external force during armature processing can be effectively solved, and the processing precision is improved.

Description

Tool clamp for armature

Technical Field

The utility model relates to the technical field of tool clamps, in particular to a tool clamp for an armature pin.

Background

In daily processing production, when processing small-size armature work piece, because the quality and the volume of armature work piece are very little, in order to reach higher precision when processing, need guarantee its fixed stability and accurate. The existing fixture for machining small-sized lug workpieces cannot achieve high-precision machining fixation.

For example, patent document CN212888313U discloses a wafer chamfering tool fixture, which comprises a workbench, wherein a workpiece support is fixedly arranged at the upper end of the workbench, a workpiece is arranged at the top of the workpiece support, a rotary spindle is arranged at one side of the workpiece, a forward moving movable top is arranged at the other side of the workpiece, the forward moving movable top is positioned at the front end of a forward moving cylinder, and an opening is arranged at one end, close to the direction of the rotary spindle, of the workpiece support; this wafer chamfer frock clamp is provided with the opening through the one end that is close to rotatory main shaft at the work piece support for do not need the support action many times in the use, if the support has the action will influence work piece positioning accuracy, also make work piece clamp time short of use when the clamping, easy operation, convenient to use has good use prospect.

However, the structure achieves the effect of not influencing the positioning precision of the workpiece only by reducing the action of the bracket in the actual use process, and the design cannot ensure that the armature cannot deviate during the armature fixing processing, thereby influencing the precision of the armature processing.

Disclosure of utility model

The utility model aims to design a fixture clamp for a lug, and provides a structural design for lug clamping, so that the fixture clamp can keep the precision of the lug position in the lug machining process, and the machined lug precision is higher.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the fixture clamp for the lug is characterized by comprising a support frame, wherein clamping seats and fixing seats which are perpendicular to the support frame are respectively arranged on two sides of the support frame; the fixed seat is provided with a fixed base; a fixed block is arranged at the center of the fixed base; the front end of the fixed base is embedded with a fixing device; the clamping seat is provided with a clamping device which is positioned on the same axis with the fixing device; one side of the clamping seat, which is far away from the clamping device, is provided with a pushing device which can push the clamping device to move back and forth. The precision during the centre gripping is improved through clamping device and fixing device's structural design, the centrifugal force that produces through the rotational speed difference between clamping centering device and the chucking axle that clamping device its outside was equipped with makes the chucking axle direct axle center of the applied force that vapour received when processing rotates, the external force when processing makes the armature position take place to shift in the armature position, centrifugal force can promote the armature to the axle center position and make it get back to accurate position, the precision of the finished product is processed to the skew that can effectually avoid clamping groove to press armature to take place when processing influences, simultaneously fixing device armature ejector pin passes through boss and spring chucking armature, through chucking axle pressure armature, the toper contact surface of fixed block and unable the leading to the fact the axial center of a resultant force is provided to the external force that receives the processing edge and acts on the armature, thereby influence the machining precision. Through the cooperation of fixing device and chucking device, the position of armature can not take place the skew when making armature processing, great improvement armature processing's precision.

Preferably, positioning blocks for fixing the base are arranged at two ends of the fixing base; one end of the positioning block is fixed with a cushion block through a supporting bolt; the support frame is provided with a locking bolt which is perpendicular to the support frame; the periphery of the fixed seat is provided with a fixed bearing. The locating piece can fix a fixed base, and a cushion block is fixed to the supporting bolt to provide support for the fixed base, so that the influence of self shaking when the fixed base is processed and rotated is almost not counted. The fixing base is locked through the locking bolt, so that the fixing block is clamped on the fixing base. The fixed bearing that the fixing base outside set up is convenient for the rotation of unable adjustment base when processing.

Preferably, a clamping block is arranged in the clamping device; a hollowed boss structure is arranged in the clamping block; a threaded hole is formed in one end, close to the clamping seat, of the boss structure; a through hole is formed in one side, away from the clamping seat, of the clamping block; the diameter of the through hole is larger than that of the threaded hole. The clamping block arranged in the clamping device is in a boss shape, the diameter of one side, close to the clamping seat, of the outer part of the clamping block is larger than that of one side, far away from the clamping seat, of the inner part of the clamping block, and the straight-through relative relation of the inner boss structure of the clamping block is opposite to that of the outer part of the clamping block, so that the clamping block can be conveniently fixed on the clamping shaft, and meanwhile, the clamping block is conveniently connected with the clamping centering device.

Preferably, the front end of the clamping seat is provided with a clamping shaft; the clamping shaft is provided with a boss matched with the boss structure in the clamping block; the front end of the clamping shaft is provided with a cylindrical clamping groove. The clamping shaft can be fastened and installed in the clamping block, the diameter of the cylindrical clamping groove at the front end of the clamping shaft is matched with the diameter of the boss at the front end of the lug ejector rod, so that the boss stretches into the clamping groove, and the clamping shaft is convenient to compress the lug.

Preferably, a clamping centering device is arranged outside the clamping shaft; a clamping bearing is arranged between the clamping centering device and the clamping block; one end of the clamping centering device, which is far away from the clamping block, is provided with a clamping bolt which is perpendicular to the clamping centering device. The clamping centering device can prevent the armature from moving during armature processing, the precision of the processed armature can be improved, the clamping centering device is connected with the clamping block through the clamping bearing, the rotation of the clamping shaft can drive the rotation of the clamping centering device during armature processing, the clamping bolt can provide friction force between the clamping shaft and the clamping centering device, relative rotation between the clamping shaft and the clamping centering device during processing can occur, the influence of rotation of the clamping shaft on the armature is small due to the fact that the rotation center is at the axis of the clamping shaft, the clamping centering device can generate a centripetal force pointing to the axis, when the rotation axis of the clamping device is offset, the rotation axis can be adjusted to the original axis by the force, so that the armature returns to the original position, errors caused by external force on the armature offset during armature processing can be reduced, and meanwhile, the precision of armature processing can be improved.

Preferably, the contact surface of the side, away from the fixing device, of the fixing block and the fixing base is a cylindrical contact surface; the contact surface of one side of the fixing block and the fixing base, which is close to the fixing device, is a conical contact surface. The fixed block and the fixed base are far away from the cylindrical contact surface on one side of the fixing device, so that the fixed block can be conveniently fixed, the conical contact surface on one side of the fixing block and the fixed base close to the fixing device can enable the clamping device to apply a pressing force to the fixing device on the conical surface when the axis of the fixing device is inclined during processing of the armature, and meanwhile, the conical surface can generate a centrifugal force pointing to the axis to push the offset axis back to the original position, so that the armature is not easy to offset, and the processing precision of the armature is improved.

Preferably, a fixing sleeve is arranged in the fixing device; the fixed sleeve is cylindrical; a sleeve bulge is arranged on one side of the fixed sleeve, which is close to the fixed block; a spring fixing block is arranged in the fixing sleeve; one end of the spring fixing block, which is close to the fixing block, is provided with a through hole matched with the sleeve bulge; one end of the spring fixing block, which is far away from the fixing block, is provided with a spring fixing column. The sleeve bulge that sets up on the fixed sleeve is cylindric, can let the spring fixed block rotate around the sleeve bulge, and the spring fixed column that the spring fixed block other end set up can block the spring and make it be difficult for taking place the skew.

Preferably, a spring is sleeved on the spring fixing column; a stop block is arranged in the fixed sleeve; one side of the stop block, which is far away from the spring, is provided with a lug mounting seat; the center of the lug mounting seat is provided with a lug ejector rod which is communicated with the stop block and the lug mounting seat; a boss is arranged at the front end of the lug ejector rod. The dog plays the effect of supporting the armature mount pad, and the through-hole has been seted up at the dog center simultaneously can make the armature ejector pin can remove in the through-hole, can make when guaranteeing the armature location, and the spring can provide sufficient compacting force. The lug boss at the front end of the lug ejector rod is inclined, and can clamp and fix the lug at the front end of the lug mounting seat. One end of the spring leans against one end of the spring fixing block, which is far away from the bulge of the sleeve, and the other end of the spring is clung to one end of the stop block, which is close to the bulge of the sleeve, and the stop block and the spring fixing block can not rotate relatively when the fixed sleeve rotates, so that the torsion stress of the spring is affected, and the problem of reduction of the processing precision of the deflection of the armature is caused.

Preferably, the lug mounting seat is provided with a plurality of lug positioning rods around the center of the lug ejector rod; the lug positioning rod extends outwards to form a lug mounting seat; the front end of the armature ejector rod is flush with the front end of the armature mounting seat; the rear end of the lug mounting seat protrudes out of the stop block; fixing bolts perpendicular to the lug mounting seats are arranged on the side periphery of the fixing sleeve. The lug positioning rod can clamp the lug to prevent relative rotation between the lug mounting seat and the lug during lug processing.

Preferably, an extension line of the axis of the lug positioning rod in the fixing device passes through the periphery of the clamping shaft in the clamping device. The extension line of the axis of the lug positioning rod in the fixing device passes through the periphery of the clamping shaft in the clamping device, so that not only is enough clamping force provided, but also enough space is reserved for subsequent processing.

Compared with the prior art, the utility model has the beneficial effects that:

Through the structural design of the fixture for the armature, the problem that the armature is deviated due to the fact that the armature is subjected to external force during armature processing can be effectively solved, and the processing precision is improved.

Through the cooperation between design fixing device and the chucking device, further reduced the problem that fixing device axle center takes place the skew in the course of working, the lug clamping convenient and fast.

Through the inside structure of design fixing device, the effectual rotation that reduces the spring, the change that elasticity took place when can reducing the spring rotation leads to the armature to take place the skew problem for the system, has improved the quality of armature.

Drawings

Fig. 1 is a schematic structural view of an embodiment of the present utility model.

Fig. 2 is a schematic structural view of the clamping device of the present utility model.

Fig. 3 is a schematic structural view of the fixing device of the present utility model.

In the figure: 1. a support frame; 2. a fixing seat; 3. a clamping seat; 4. a positioning block; 5. fixing a bearing; 6. a fixed base; 7. a fixed block; 8. a support bolt; 9. a locking bolt; 10. a clamping device; 11. a fixing device; 12. a clamping block; 13. a clamping shaft; 14. a clamping groove; 15. clamping and centering devices; 16. clamping a bearing; 17. a clamping bolt; 18. a fixed sleeve; 19. a sleeve boss; 20. a spring fixing block; 21. a spring fixing column; 22. a spring; 23. a stop block; 24. a lug mounting base; 25. a lug ejector rod; 26. a fixing bolt; 27. a lug positioning rod.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In order to achieve the above purpose, the present utility model provides the following technical solutions: the fixture clamp for the lug comprises a support frame 1, wherein two sides of the support frame 1 are respectively provided with a clamping seat 3 and a fixing seat 2 which are perpendicular to the support frame 1; the fixed seat 2 is provided with a fixed base 6; a fixed block 7 is arranged at the center of the fixed base 6; the front end of the fixed base 6 is embedded with a fixing device 11; the clamping seat 3 is provided with a clamping device 10 which is positioned on the same axis with the fixing device 11; the side of the clamping seat 3 away from the clamping device 10 is provided with a pushing device which can push the clamping device 10 to move back and forth.

The precision during clamping is improved through the structural design of the clamping device 10 and the fixing device 11, the centrifugal force generated by the rotation speed difference between the clamping centering device 15 and the clamping shaft 13 arranged on the outer side of the clamping device 10 is used for enabling the force applied to the clamping shaft 13 during machining rotation to be directed to the axle center, the position of the lug is offset due to the force applied to the lug by the external force during machining, the lug is pushed to the axle center position by the centrifugal force to return to the accurate position, the fact that the offset generated during clamping groove 14 tightly presses the lug during machining of the lug can be effectively avoided, meanwhile, the lug supporting rod 25 of the lug of the fixing device 11 clamps the lug through the boss and the spring 22, the lug is tightly pressed through the clamping shaft 13, and the force with resultant force directed to the axle center is provided by the conical contact surface at the upper ends of the fixing block 7 and the fixing base 6 during machining, so that the external force applied to the lug by the machining knife edge cannot offset the fixing device 11, and machining precision is affected. The cooperation of the fixing device 11 and the clamping device 10 can well prevent the position of the armature from shifting during armature processing, and greatly improve the precision of armature processing.

As shown in fig. 1, 2 and 3, in the drawings: 1. a support frame; 2. a fixing seat; 3. a clamping seat; 4. a positioning block; 5. fixing a bearing; 6. a fixed base; 7. a fixed block; 8. a support bolt; 9. a locking bolt; 10. a clamping device; 11. a fixing device; 12. a clamping block; 13. a clamping shaft; 14. a clamping groove; 15. clamping and centering devices; 16. clamping a bearing; 17. a clamping bolt; 18. a fixed sleeve; 19. a sleeve boss; 20. a spring fixing block; 21. a spring fixing column; 22. a spring; 23. a stop block; 24. a lug mounting base; 25. a lug ejector rod; 26. a fixing bolt; 27. a lug positioning rod.

Positioning blocks 4 for fixing the fixing seat 2 are arranged at two ends of the fixing seat 2; one end of the positioning block 4 is fixed with a cushion block through a supporting bolt 8; the support frame 1 is provided with a locking bolt 9 which is arranged perpendicular to the support frame 1; the periphery of the fixed seat 2 is provided with a fixed bearing 5. The positioning block 4 can position and fix the fixed base 6, and the supporting bolt 8 fixes a cushion block to provide support for the fixed base 6, so that the influence generated by shaking of the fixed base 6 during processing and rotation is almost negligible. The fixing base 6 is locked by the locking bolt 9 so that the fixing block 7 is clamped on the fixing base 6. The fixed bearing 5 arranged outside the fixed seat 2 is convenient for fixing the rotation of the base 6 during processing.

A clamping block 12 is arranged in the clamping device 10; a hollowed boss structure is arranged in the clamping block 12; a threaded hole is formed in one end, close to the clamping seat 3, of the boss structure; a through hole is arranged on one side of the clamping block 12 away from the clamping seat 3; the diameter of the through hole is larger than that of the threaded hole. The clamping block 12 arranged in the clamping device 10 is in a boss shape, the diameter of one side of the outer part of the clamping block close to the clamping seat 3 is larger than that of one side of the inner part of the clamping block close to the clamping seat 3, the diameter of the inner part of the clamping block 12 is opposite to that of the outer part of the clamping block, and the clamping block 12 can be used for conveniently fixing the clamping shaft 13 and simultaneously facilitating connection between the outer part of the clamping block 12 and the clamping centering device 15.

The front end of the clamping seat 3 is provided with a clamping shaft 13; the clamping shaft 13 is provided with a boss matched with the boss structure in the clamping block 12; the front end of the clamping shaft 13 is provided with a cylindrical clamping groove 14. The clamping shaft 13 can be tightly arranged in the clamping block 12, the diameter of the cylindrical clamping groove 14 at the front end of the clamping shaft 13 is matched with the diameter of the boss at the front end of the lug ejector rod 25, so that the boss stretches into the clamping groove 14, and the clamping shaft 13 can conveniently press the lug.

The clamping centering device 15 is arranged outside the clamping shaft 13; a clamping bearing 13 is arranged between the clamping centering device 15 and the clamping block 12; the end of the clamping and centering device 15 remote from the clamping block 12 is provided with a clamping bolt 17 arranged perpendicularly to the clamping and centering device 15. The clamping centering device 15 can prevent the armature from moving during armature processing, the precision of the processed armature can be improved, the clamping centering device 15 and the clamping block 12 are connected through the clamping shaft 13, the rotation of the clamping shaft 13 can drive the rotation of the clamping centering device 15 during armature processing, the clamping bolt 17 can provide friction force between the clamping shaft 13 and the clamping centering device 15, the clamping shaft 13 and the clamping centering device 15 can rotate relatively during armature processing, the influence of rotation of the clamping shaft 13 on the armature is small due to the fact that the rotation center is at the axis of the clamping shaft 13, the clamping centering device 15 can generate a centripetal force pointing to the axis, when the rotation axis of the clamping device 10 is offset, the rotation axis can be adjusted to the original axis by the force, the armature returns to the original position, errors caused by external force on armature offset during armature processing can be reduced, and meanwhile, the precision of armature processing can be improved.

The contact surface of the side of the fixed block 7 and the fixed base 6 far away from the fixing device 11 is a cylindrical contact surface; the contact surface of the fixing block 7 and the fixing base 6 on the side close to the fixing device 11 is a conical contact surface. The cylindrical contact surface of one side of the fixing block 7 and the fixing base 6, which are far away from the fixing device 11, can facilitate the fixing of the fixing block 7, the conical contact surface of one side of the fixing block 7 and the fixing base 6, which is close to the fixing device 11, can enable the fixing block 7 and the fixing base 6 to be difficult to deviate when the armature is processed, if the axis of the fixing device 11 is inclined, the pressing force of the clamping device 10 on the fixing device 11 can act on the conical surface, and meanwhile, the centrifugal force pointing to the axis can be generated on the conical surface to push the deviated axis back to the original position, so that the armature is difficult to deviate, and the processing precision of the armature is improved.

The fixing device 11 is internally provided with a fixing sleeve 18; the fixed sleeve 18 is cylindrical; a sleeve bulge 19 is arranged on one side of the fixed sleeve 18 close to the fixed block 7; a spring fixing block 20 is arranged in the fixing sleeve 18; the end of the spring fixing block 20, which is close to the fixing block 7, is provided with a through hole matched with the sleeve bulge 19; the end of the spring fixing block 20 remote from the fixing block 7 is provided with a spring fixing column 21. The sleeve bulge 19 arranged on the fixed sleeve 18 is cylindrical, so that the spring fixing block 20 can rotate around the sleeve bulge 19, and the spring fixing column 21 arranged at the other end of the spring fixing block 20 can clamp the spring 22 to ensure that the spring 22 is not easy to deviate.

A spring 22 is sleeved on the spring fixing column 21; a stop block 23 is arranged in the fixed sleeve 18; one side of the stop block 23 away from the spring 22 is provided with a lug mounting seat 24; the center of the lug mounting seat 24 is provided with a through stop block 23 and a lug ejector rod 25 of the lug mounting seat 24; a boss is provided at the front end of the lug post 25. The stopper 23 plays a role in supporting the lug mounting seat 24, and meanwhile, a through hole is formed in the center of the stopper 23, so that the lug ejector rod 25 can move in the through hole, and the spring 22 can provide enough pressing force while guaranteeing the lug positioning. The front end of the lug post 25 is inclined to clamp the lug to the front end of the lug mount 24. One end of the spring 22 is leaned against one end of the spring fixing block 20, which is far away from the sleeve bulge 19, and the other end is clung to one end of the stop block 23, which is close to the sleeve bulge 19, and the design can prevent relative rotation between the stop block 23 and the spring fixing block 20 when the fixing sleeve 18 rotates, so that the torsion stress of the spring 22 is influenced, and the problem of reduced precision of processing of offset of the armature is caused.

The lug mounting seat 24 is provided with a plurality of lug positioning rods 27 around the center of the lug ejector rod 25; the lug positioning rod 27 extends outwardly from the lug mount 24; the front end of the armature ejector rod 25 is flush with the front end of the armature mount 24; the rear end of the lug mounting seat 24 protrudes out of the stop block 23; the fixing sleeve 18 has fixing bolts 26 disposed perpendicularly to the lug mount 24 on the side periphery. The lug positioning lever 27 is adapted to lock the lug to prevent relative rotation between the lug and the lug mount 24 during lug machining.

An extension line of the axis of the lug positioning rod 27 in the fixing device 11 passes through the outer periphery of the clamping shaft 13 in the clamping device 10. Extension of the axis of the lug positioning lever 27 in the fixture 11 beyond the periphery of the clamp shaft 13 in the clamp 10 provides sufficient clamping force while providing sufficient room for subsequent processing.

Compared with the prior art, the utility model has the beneficial effects that:

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.

Claims

1. Frock clamp of joining piece, characterized in that includes:

The device comprises a support frame (1), wherein two sides of the support frame (1) are respectively provided with a clamping seat (3) and a fixing seat (2) which are perpendicular to the support frame (1);

A fixed base (6) is arranged on the fixed seat (2); a fixed block (7) is arranged at the center of the fixed base (6); the front end of the fixed base (6) is embedded with a fixing device (11);

The clamping seat (3) is provided with a clamping device (10) which is positioned on the same axis with the fixing device (11);

One side of the clamping seat (3) far away from the clamping device (10) is provided with a pushing device capable of pushing the clamping device (10) to move back and forth.

2. The fixture of claim 1, wherein positioning blocks (4) for fixing the fixing base (2) are arranged at two ends of the fixing base (2); one end of the positioning block (4) is fixed with a cushion block through a supporting bolt (8); the support frame (1) is provided with a locking bolt (9) which is perpendicular to the support frame (1); the periphery of the fixed seat (2) is provided with a fixed bearing (5).

3. The tool clamp of a lug as set forth in claim 1, wherein a clamp block (12) is provided in the clamp assembly (10); a hollowed boss structure is arranged in the clamping block (12); one end of the boss structure, which is close to the clamping seat (3), is provided with a threaded hole; a through hole is formed in one side, away from the clamping seat (3), of the clamping block (12); the diameter of the through hole is larger than that of the threaded hole.

4. A tool clamp for a lug as claimed in claim 3, wherein the front end of the clamping seat (3) is provided with a clamping shaft (13); a boss matched with the boss structure in the clamping block (12) is arranged on the clamping shaft (13); the front end of the clamping shaft (13) is provided with a cylindrical clamping groove (14).

5. The tool clamp of the armature pin according to claim 4, characterized in that a clamping centering device (15) is arranged outside the clamping shaft (13); a clamping shaft (13) is arranged between the clamping centering device (15) and the clamping block (12); one end of the clamping centering device (15) far away from the clamping block (12) is provided with a clamping bolt (17) perpendicular to the clamping centering device (15).

6. The tool clamp of the armature of claim 5, wherein the contact surface of the side of the fixed block (7) and the fixed base (6) away from the fixture (11) is a cylindrical contact surface; the contact surface of one side of the fixing block (7) and one side of the fixing base (6) close to the fixing device (11) is a conical contact surface.

7. The tool clamp of a lug as set forth in claim 1, wherein a retaining sleeve (18) is provided in the retaining device (11); the fixed sleeve (18) is cylindrical; a sleeve bulge (19) is arranged on one side of the fixed sleeve (18) close to the fixed block (7); a spring fixing block (20) is arranged in the fixing sleeve (18); one end of the spring fixing block (20) close to the fixing block (7) is provided with a through hole matched with the sleeve bulge (19); one end of the spring fixing block (20) far away from the fixing block (7) is provided with a spring fixing column (21).

8. The fixture of a armature as set forth in claim 7, wherein the spring retention post (21) is sleeved with a spring (22); a stop block (23) is arranged in the fixed sleeve (18); one side of the stop block (23) far away from the spring (22) is provided with a lug mounting seat (24); the center of the lug mounting seat (24) is provided with a through stop block (23) and a lug ejector rod (25) of the lug mounting seat (24); a boss is arranged at the front end of the lug ejector rod (25).

9. The fixture for a mouthpiece of claim 8, wherein the mouthpiece mount (24) has a plurality of mouthpiece positioning pins (27) around a center of the mouthpiece ejector pin (25); the lug positioning rod (27) extends outwards to form a lug mounting seat (24); the front end of the armature ejector rod (25) is flush with the front end of the armature mounting seat (24); the rear end of the lug mounting seat (24) protrudes out of the stop block (23); fixing bolts (26) perpendicular to the lug mounting seat (24) are arranged on the side periphery of the fixing sleeve (18).

10. The fixture for a lug as claimed in any one of claims 1 to 9, wherein an extension of the axis of the lug positioning rod (27) in the fixture (11) passes over the outer circumference of the clamping shaft (13) in the clamping device (10).