CN218964770U

CN218964770U - Pneumatic dovetail clamp

Info

Publication number: CN218964770U
Application number: CN202223353246.6U
Authority: CN
Inventors: 何立钲; 蔡日新; 黄吕芳; 谢永良; 李恒
Original assignee: Zhuhai Guanghaojie Technology Co ltd
Current assignee: Zhuhai Guanghaojie Technology Co ltd
Priority date: 2022-12-14
Filing date: 2022-12-14
Publication date: 2023-05-05
Anticipated expiration: 2032-12-14

Abstract

The utility model relates to a pneumatic dovetail clamp, which comprises a first mounting seat, a second mounting seat, a dovetail movable clamping seat, a dovetail fixed clamping seat, an air inlet, a first cavity, a connecting rod, an oil filling port, an oil way, a movable core, a spring, a wedge-shaped transmission block, an inclined block, an air inlet channel, an air outlet channel, a second cavity, a third cavity, a guide pin and a movable core base, wherein high-pressure air is introduced into the air inlet, enters the second cavity through the air inlet channel, and pushes the movable core base, the movable core and the wedge-shaped transmission block to move upwards together, and the dovetail movable clamping seat moves outwards to finish the loosening action of the pneumatic dovetail clamp; the air inlet is disconnected, the dovetail movable clamping seat moves inwards, and the clamping action of the pneumatic dovetail clamp is completed; the ventilation is released, the air interruption is realized, the response speed is high, the clamping efficiency is high, and the clamping force distribution of the blank is uniform.

Description

Pneumatic dovetail clamp

Technical Field

The utility model relates to the technical field of clamps, in particular to a pneumatic dovetail clamp.

Background

The work piece anchor clamps are the important instrument in the production and processing process, and current anchor clamps are through the screw in, drive the grip block and remove, shorten the distance of grip block and another grip surface, and screw and corresponding grip block are equipped with a plurality of, just can guarantee clamping dynamics, but when centre gripping blank, need with a plurality of screws manual screw in, the clamping spends time, and clamping inefficiency to the grip surface that the polylith grip block formed is difficult for producing the uneven problem of clamping stress.

Disclosure of Invention

In order to solve the problems, the utility model provides a pneumatic dovetail clamp.

The utility model provides the following technical scheme: the pneumatic dovetail clamp comprises a four-axis index plate and a pneumatic chuck, wherein the four-axis index plate is arranged on a workbench, and the pneumatic chuck is arranged on the four-axis index plate and further comprises a clamping mechanism and a first mounting seat; the clamping mechanism comprises a second installation seat, a movable core, a spring and an inclined block, and the first installation seat is connected with the air chuck through a connecting rod; the first mounting seat is connected with the second mounting seat; the second mounting seat is connected with a dovetail fixing clamping seat; the first mounting seat is provided with a first cavity, the bottom of the movable core is provided with a movable core base, the movable core and the movable core base are integrally formed, the bottom of the movable core base is provided with a second cavity, and the inside of the second mounting seat is provided with a third cavity; the movable core base is accommodated in the first cavity, and the side surface of the movable core base is abutted against the inner wall of the first cavity; the movable core is accommodated in the third cavity; the movable core base is provided with a first groove, and the bottom of the second mounting seat is provided with a second groove; one end of the spring is abutted against the first groove, and the other end of the spring is abutted against the second groove; the inclined block is provided with an inclined groove, one end of the movable core, which is far away from the movable core base, is connected with a wedge-shaped transmission block, and one end of the wedge-shaped transmission block, which is far away from the movable core, is in sliding connection with the inclined groove; the inclined block penetrates through the opening of the third cavity to be connected with a dovetail movable clamping seat, and the dovetail movable clamping seat is abutted against the dovetail fixed clamping seat; the dovetail fixing clamp seat is provided with a slot, and the slot is matched with the dovetail movable clamp seat to form a dovetail through slot; an air inlet channel is formed in the first mounting seat, and an air inlet is formed in the outer wall of the first mounting seat; one end of the air inlet channel is communicated with the air inlet, and the other end of the air inlet channel is communicated with the second cavity; an air outlet channel is further formed in the first mounting seat; one end of the air outlet channel is communicated with the first cavity, and the other end of the air outlet channel is communicated with the outside of the first mounting seat.

Furthermore, the first mounting seat can be a triangular prism, three side surfaces on the triangular prism are all provided with the first cavity, and the first cavity is connected with the clamping mechanism.

Further, the first mounting seat is connected with the second mounting seat through a first screw; the second mounting seat is connected with the dovetail fixing clamping seat through a second screw; the inclined block is connected with the dovetail movable clamping seat through a third screw.

Further, at least two first grooves are formed in the movable core base, at least two second grooves are formed in the bottom of the second mounting seat, at least two springs are arranged on the springs, and the springs are arranged in a circumferential array with the movable core as a circle center.

Further, an oil filling port is arranged on the outer wall of the second mounting seat; the second mounting seat, the inclined block and the wedge-shaped transmission block are all provided with through grooves, the through grooves of the second mounting seat, the through grooves of the inclined block and the through grooves of the wedge-shaped transmission block are mutually matched to form an oil circuit, and the oil circuit is communicated with the oil filling port.

Further, the device also comprises a guide pin; the movable core base is provided with a first guide hole, and the bottom of the second connecting seat is provided with a second guide hole corresponding to the first guide hole; one end of the guide pin is accommodated in the first guide hole, and the other end of the guide pin is accommodated in the second guide hole.

Further, the device also comprises a first locating pin; the second mounting seat is provided with a first positioning hole, and the bottom of the dovetail fixing clamp seat is provided with a second positioning hole corresponding to the first positioning hole; one end of the first locating pin is positioned in the first locating hole, and the other end of the first locating pin is positioned in the second locating hole; the first locating pins are provided with at least two locating pins.

Further, a third groove is formed in the side face of the movable core base, an oil sealing ring is accommodated in the third groove, the inner side of the sealing ring abuts against the third groove, and the outer side of the sealing ring abuts against the inner wall of the first cavity.

Further, the movable core is sequentially sleeved with a dust ring and a bushing from top to bottom.

Further, a second locating pin is arranged on the dovetail fixing clamp seat.

Compared with the prior art, the utility model has the beneficial effects that: introducing high-pressure gas into the air inlet, enabling the high-pressure gas to enter the second cavity through the air inlet channel, pushing the movable core base to move upwards in the first cavity, enabling the movable core and the wedge-shaped transmission block to move upwards together in the third cavity, compressing the spring, and discharging the gas in the first cavity to the outside through the air outlet channel; the wedge-shaped transmission block slides upwards in the chute, and the inclined block moves outwards due to the principle of inclined plane transmission, so that the dovetail movable clamp seat is driven to move outwards, and the pneumatic dovetail clamp is loosened; after placing the blank in the dovetail through groove, the air inlet is disconnected, the movable core base is not supported by the thrust of high-pressure air, the spring rebounds, the movable core base moves downwards to drive the movable core and the wedge-shaped transmission block to move downwards together, the wedge-shaped transmission block slides downwards in the chute, the inclined block moves inwards due to the principle of inclined plane transmission and drives the dovetail movable clamping seat to move inwards, so that the blank is clamped between the dovetail movable clamping seat and the dovetail fixed clamping seat, and the clamping action of the pneumatic dovetail clamp is completed; the ventilation is released, the air interruption is realized, the response speed is high, the clamping efficiency is high, and the clamping force distribution of the blank is uniform.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a diagram illustrating the use of embodiment 1 of the present utility model;

FIG. 2 is a perspective view of embodiment 1 of the present utility model;

FIG. 3 is a schematic view of a clamping mechanism according to the present utility model;

FIG. 4 is an exploded view of the clamping mechanism of the present utility model;

FIG. 5 is a cross-sectional view of the clamping mechanism of the present utility model after a partial explosion;

FIG. 6 is a partial cross-sectional view of the clamping mechanism of the present utility model;

FIG. 7 is a further angular partial cross-sectional view of the clamping mechanism of the present utility model;

FIG. 8 is a schematic view of an oil circuit according to the present utility model;

FIG. 9 is a diagram illustrating the use of embodiment 2 of the present utility model;

fig. 10 is a schematic structural diagram of a first mounting seat according to embodiment 2 of the present utility model;

FIG. 11 is a cross-sectional view of a clamping mechanism according to embodiment 2 of the present utility model;

the names of the components marked in the figures are as follows:

1. a work table; 2. a four-axis dividing disc; 3. an air chuck; 4. a first mount; 5. a second mounting base; 6. blank material; 7. a dovetail movable clamping seat; 8. dovetail fixing clamp seat; 9. an air inlet; 10. a first screw; 11. a second screw; 12. a third screw; 13. a first positioning pin; 14. a first cavity; 15. a connecting rod; 16. an oil filling port; 17. an oil path; 18. a movable core; 19. a spring; 20. wedge-shaped transmission blocks; 21. a sloping block; 22. an air intake passage; 23. an air outlet channel; 24. a bushing; 25. a third cavity; 26. a second positioning pin; 27. a movable core base; 28. a seal ring; 29. a chute; 30. a guide pin; 31. a second cavity; 32. a dust ring; 33. a first groove; 34. a second groove; 35. and (5) grooving.

Detailed Description

The following description of the present utility model will be made more fully hereinafter with reference to the accompanying drawings, in which it is shown, however, 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.

Example 1: 1-5, a pneumatic dovetail clamp comprises a four-axis index plate 2 and a pneumatic chuck 3, wherein the four-axis index plate 2 is arranged on a workbench 1, the pneumatic chuck 3 is arranged on the four-axis index plate 2, the pneumatic dovetail clamp further comprises a clamping mechanism and a first mounting seat 4, and the first mounting seat 4 is of a cuboid type; the clamping mechanism comprises a second mounting seat 5, a movable core 18, a spring 19 and an inclined block 21, and the first mounting seat 4 is connected with the air chuck 3 through a connecting rod 15; the second mounting seat 5 is mounted on the first mounting seat 4; the second mounting seat 5 is connected with a dovetail fixing clamping seat 8; a first cavity 14 is formed in one surface of the first mounting seat 4, a movable core base 27 is arranged at the bottom of the movable core 18, the movable core 18 and the movable core base 27 are integrally formed, the movable core base 27 is accommodated in the first cavity 14, and the side surface of the movable core base 27 is abutted against the inner wall of the first cavity 14; the bottom of the movable core base 27 is provided with a second cavity 31, and the inside of the second mounting seat 5 is provided with a third cavity 25; the movable core 18 is accommodated in the third cavity 25; at least two first grooves 33 are formed in the movable core base 27, at least two second grooves 34 are formed in the bottom of the second mounting seat 5, at least two springs 19 are arranged, the springs 19 are arranged in a circumferential array with the movable core 18 as a circle center, and the number of the first grooves 33, the number of the second grooves 34 and the number of the springs 19 are the same and correspond to each other one by one; one end of the spring 19 is abutted against the first groove 33, the other end is abutted against the second groove 34, when the pneumatic dovetail clamp does not work, the spring 19 is in a semi-compressed state, when the dovetail movable clamp seat 7 moves outwards, the spring 19 is in a further compressed state, so that the spring rebound force is larger than the natural compression rebound force when the air inlet 9 is disconnected, and further the clamping force is larger; the inclined block 21 is provided with an inclined groove 29, one end of the movable core 18, which is far away from the movable core base 27, is connected with a wedge-shaped transmission block 20, and one end of the wedge-shaped transmission block 20, which is far away from the movable core 18, is in sliding connection with the inclined groove 29; the inclined block 21 penetrates through the opening of the third cavity 25 and is connected with a dovetail movable clamping seat 7, and the dovetail movable clamping seat 7 is abutted against the dovetail fixed clamping seat 8; the dovetail fixing clamp seat 8 is provided with a slot 35, and the slot 35 is matched with the dovetail movable clamp seat 7 to form a dovetail through slot; an air inlet channel 22 is formed in the first mounting seat 4, and an air inlet 9 is formed in the outer wall of the first mounting seat 4; the intake passage 22 has one end communicating with the intake port 9 and the other end communicating with the second cavity 3124; an air outlet channel 23 is also arranged in the first mounting seat 4; one end of the air outlet channel 23 is communicated with the first cavity 14, and the other end is communicated with the outside of the first mounting seat 4; the dovetail fixing clamp seat 8 is provided with a second positioning pin 26; milling a groove matched with the second positioning pin 26 before machining the blank, positioning the blank on the dovetail fixing clamp seat 8 through the second positioning pin 26 during clamping, and improving the machining accuracy of the blank; when clamping is needed, the blank 6 is milled with a dovetail bulge and a groove matched with the second locating pin 26 on the outside; high-pressure gas is introduced into the air inlet 9, the high-pressure gas enters the second cavity 31 through the air inlet channel 22 and pushes the movable core base 27 to move upwards, the movable core 18 and the wedge-shaped transmission block 20 further move upwards together, meanwhile, the spring 19 is compressed further from the original compressed state, and the gas in the first cavity 14 is discharged outside through the air outlet channel 23; the wedge-shaped transmission block 20 slides upwards in the chute 29, and due to the principle of inclined plane transmission, the inclined block 21 moves outwards, so that the dovetail movable clamp seat 7 is driven to move outwards, and the pneumatic dovetail clamp loosening action is completed; the dovetail bulge of the blank 6 is placed in the dovetail through groove, so that the air inlet 9 is disconnected, the movable core base 27 is not supported by the thrust of high-pressure air, the spring 19 rebounds, so that the movable core base 27 moves downwards to drive the movable core 18 and the wedge-shaped transmission block 20 to move downwards together, the wedge-shaped transmission block 20 slides downwards in the chute 29, the inclined block 21 moves inwards due to the principle of inclined plane transmission and drives the dovetail movable clamping seat 7 to move inwards, the blank 6 is clamped between the dovetail movable clamping seat 7 and the dovetail fixed clamping seat 8, the clamping action of the pneumatic dovetail clamp is completed, each surface in the dovetail groove is attached to the dovetail bulge, so that the clamping force borne by the clamped dovetail bulge is more uniform, and meanwhile, the shape of the dovetail enables the blank 6 to be clamped on the pneumatic dovetail clamp more firmly; the ventilation is released, the air interruption is realized, the response speed is high, the clamping efficiency is high, and the clamping force applied to the blank 6 is uniformly distributed.

The first mounting seat 4 is connected with the second mounting seat 5 through a first screw 10; the second mounting seat 5 is connected with the dovetail fixing clamping seat 8 through a second screw 11; the inclined block 21 is connected with the dovetail movable clamping seat 7 through a third screw 12; the first mounting seat 4 of a different type can be replaced by detaching the first screw 10; by disassembling the second screw 11 and the third screw 12, the dovetail movable clamping seat 7 and the dovetail fixed clamping seat 8 with different models are replaced, so that blanks 6 with different shapes can be clamped.

As shown in fig. 4, a first positioning hole is formed in the second mounting seat 5, and a second positioning hole is formed in the bottom of the dovetail fixing clamp seat 8 at a position corresponding to the first positioning hole; one end of the first positioning pin 13 is positioned in the first positioning hole, the other end of the first positioning pin 13 is positioned in the second positioning hole, and at least two first positioning pins 13 are arranged; when the pneumatic dovetail clamp is assembled, the position of the dovetail fixing clamp seat 8 on the second mounting seat 5 is positioned through the first positioning pin 13, and then the dovetail fixing clamp seat 8 is fixed on the second mounting seat 5 through the second screw 11, so that the assembly precision is improved.

As shown in fig. 5, a third groove is formed in the side surface of the movable core base 27, a sealing ring 28 is accommodated in the third groove, the inner side of the sealing ring 28 abuts against the third groove, and the outer side of the sealing ring 28 abuts against the inner wall of the first cavity 14; when the high-pressure gas enters the second cavity 31 from the air inlet channel 22, the sealing ring 28 blocks the gas, so that the gas is prevented from leaking from the second cavity 31 to the first cavity 14, the thrust of the high-pressure gas on the movable core base 27 is reduced, and the clamping efficiency is reduced.

As shown in fig. 5 and 7, the movable core 18 is sleeved with a dust ring 32 and a bushing 24 from top to bottom in sequence; the dust ring 32 prevents dust particles from entering the first cavity 14 from the gap between the dovetail movable clamping seat 7 and the dovetail fixed clamping seat 8 to collide with the movable core 18, the movable core base 27 and the spring 19 when the pneumatic dovetail clamp works, and reduces the service lives of the movable core 18, the movable core base 27 and the spring 19; the bushing 24 prevents friction between the movable core 18 and the inner wall of the third cavity 25, which would reduce the service life of the movable core 18.

As shown in fig. 6, the movable core base 27 is provided with a first guide hole, and the bottom of the second mounting seat is provided with a second guide hole corresponding to the first guide hole; one end of the guide pin 30 is accommodated in the first guide hole, and the other end is accommodated in the second guide hole; when the high-pressure gas is introduced into the gas inlet 9, the high-pressure gas pushes the movable core holder 27 to move upward in the direction of the guide pin 30, and the guide pin 30 stabilizes the movement of the movable core holder 27 and the movable core 18.

As shown in fig. 8, the outer wall of the second mounting seat 5 is provided with an oil filling port 16; the second mounting seat 5, the inclined block 21 and the wedge-shaped transmission block 20 are all provided with through grooves, and the through grooves of the second mounting seat 5, the through grooves of the inclined block 21 and the through grooves of the wedge-shaped transmission block 20 are mutually matched to form an oil way 17, and the oil way 17 is communicated with the oil filling port 16; when the pneumatic dovetail clamp works, lubricating oil is introduced into the oil filling port 16, the lubricating oil lubricates the second mounting seat 5, the inclined block 21 and the wedge-shaped transmission block 20 through the oil way 17, friction born by the second mounting seat 5, the inclined block 21 and the wedge-shaped transmission block 20 during working is reduced, the service life is prolonged, the reaction speed of the second mounting seat 5, the inclined block 21 and the wedge-shaped transmission block 20 during working is increased, and the clamping efficiency is improved.

Example 1 workflow: the four-axis dividing disc 2 is arranged on the workbench 1, the air chuck 3 is arranged on the four-axis dividing disc 2, and the clamping mechanism is arranged on the air chuck 3; when clamping is needed, high-pressure gas is introduced into the air inlet 9, the high-pressure gas enters the second cavity 31 through the air inlet channel 22 and pushes the movable core base 27 to move upwards, the movable core 18 and the wedge-shaped transmission block 20 move upwards together, meanwhile, the spring 19 compresses, and the gas in the first cavity 14 is discharged outside through the air outlet channel 23; the wedge-shaped transmission block 20 slides upwards in the chute 29, and due to the principle of inclined plane transmission, the inclined block 21 moves outwards, so that the dovetail movable clamp seat 7 is driven to move outwards, and the pneumatic dovetail clamp loosening action is completed; after the blank 6 is placed in the dovetail through groove, the air inlet 9 is disconnected, the movable core base 27 is not supported by the thrust of high-pressure air, the spring 19 rebounds, the movable core base 27 moves downwards to drive the movable core 18 and the wedge-shaped transmission block 20 to move downwards together, the wedge-shaped transmission block 20 slides downwards in the chute 29, the inclined block 21 moves inwards due to the principle of inclined plane transmission and drives the dovetail movable clamping seat 7 to move inwards to clamp the blank 6 between the dovetail movable clamping seat 7 and the dovetail fixed clamping seat 8, and the clamping action of the pneumatic dovetail clamp is completed; the ventilation is released, the air interruption is realized, the response speed is high, the clamping efficiency is high, and the clamping force of the blank 6 is uniformly distributed; if the blank 6 with other shapes needs to be clamped, the dovetail movable clamping seat 7 and the dovetail fixed clamping seat 8 which are suitable for the shapes of the blank 6 can be replaced by disassembling the second screw 11 and the third screw 12; after the blank 6 is clamped, the machine tool processes the blank 6, and one-time clamping is realized through the rotation angle of the four-axis dividing disc 2, so that different surfaces of the blank 6 are processed.

Example 2:

as shown in fig. 9-11, unlike in embodiment 1, the first mount 4 is triangular prism-shaped, and three sides of the first mount 4 are provided with first cavities 14, and the first cavities 14 are connected with clamping mechanisms; through the first mount pad 4 of triangular prism formula, can once the clamping, realize processing many blanks 6, increase machining efficiency.

It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "upper," "lower," "left," "right," "front," "back," and the like are used herein for illustrative purposes only.

Claims

1. The utility model provides a pneumatic forked tail anchor clamps, includes four-axis graduated disk and air chuck, four-axis graduated disk installs on the workstation, air chuck installs on the four-axis graduated disk, its characterized in that: the device also comprises a clamping mechanism and a first mounting seat; the clamping mechanism comprises a second installation seat, a movable core, a spring and an inclined block, and the first installation seat is connected with the air chuck through a connecting rod; the second mounting seat is mounted on the first mounting seat; the second mounting seat is connected with a dovetail fixing clamping seat; the first mounting seat is provided with a first cavity, the bottom of the movable core is provided with a movable core base, the movable core and the movable core base are integrally formed, the movable core base is accommodated in the first cavity, and the side surface of the movable core base is abutted against the inner wall of the first cavity; the bottom of the movable core base is provided with a second cavity, and a third cavity is formed in the second mounting seat; the movable core is accommodated in the third cavity; the movable core base is provided with a first groove, and the bottom of the second mounting seat is provided with a second groove; one end of the spring is abutted with the first groove, and the other end of the spring is abutted with the second groove; the inclined block is provided with an inclined groove, one end of the movable core, which is far away from the movable core base, is connected with a wedge-shaped transmission block, and one end of the wedge-shaped transmission block, which is far away from the movable core, is in sliding connection with the inclined groove; the inclined block penetrates through the opening of the third cavity to be connected with a dovetail movable clamping seat, and the dovetail movable clamping seat is abutted against the dovetail fixed clamping seat; the dovetail fixing clamp seat is provided with a slot, and the slot is matched with the dovetail movable clamp seat to form a dovetail through slot; an air inlet channel is formed in the first mounting seat, and an air inlet is formed in the outer wall of the first mounting seat; one end of the air inlet channel is communicated with the air inlet, and the other end of the air inlet channel is communicated with the second cavity; an air outlet channel is further formed in the first mounting seat; one end of the air outlet channel is communicated with the first cavity, and the other end of the air outlet channel is communicated with the outside of the first mounting seat.

2. The pneumatic dovetail fixture of claim 1, wherein: the first mounting seat is cuboid, and the first cavity is located on one face of the first mounting seat.

3. The pneumatic dovetail fixture of claim 1, wherein: the first mounting seat is triangular prism-shaped, three sides of the first mounting seat are provided with first cavities, and the first cavities are connected with the clamping mechanisms.

4. The pneumatic dovetail fixture of claim 1, wherein: the first mounting seat is connected with the second mounting seat through a first screw; the second mounting seat is connected with the dovetail fixing clamping seat through a second screw; the inclined block is connected with the dovetail movable clamping seat through a third screw.

5. The pneumatic dovetail fixture of claim 1, wherein: the movable core base is provided with a plurality of first grooves, the bottom of the second mounting seat is provided with a plurality of second grooves, the springs are provided with a plurality of springs, the springs are arranged in a circumferential array by taking the movable core as a circle center, and the number of the first grooves, the number of the second grooves and the number of the springs are the same and correspond to each other one by one.

6. The pneumatic dovetail fixture of claim 1, wherein: an oil filling port is arranged on the outer wall of the second mounting seat; the second mounting seat, the inclined block and the wedge-shaped transmission block are all provided with through grooves, the through grooves of the second mounting seat, the through grooves of the inclined block and the through grooves of the wedge-shaped transmission block are mutually matched to form an oil circuit, and the oil circuit is communicated with the oil filling port.

7. The pneumatic dovetail fixture of claim 1, wherein: the guide pin is also included; the movable core base is provided with a first guide hole, and the bottom of the second mounting seat is provided with a second guide hole corresponding to the first guide hole; one end of the guide pin is accommodated in the first guide hole, and the other end of the guide pin is accommodated in the second guide hole.

8. The pneumatic dovetail fixture of claim 1, wherein: the first positioning pin is also included; the second mounting seat is provided with a first positioning hole, and the bottom of the dovetail fixing clamp seat is provided with a second positioning hole corresponding to the first positioning hole; one end of the first locating pin is positioned in the first locating hole, and the other end of the first locating pin is positioned in the second locating hole; the first locating pins are provided with a plurality of locating pins.

9. The pneumatic dovetail fixture of claim 1, wherein: the side of the movable core base is provided with a third groove, a sealing ring is accommodated in the third groove, the inner side of the sealing ring is abutted against the third groove, and the outer side of the sealing ring is abutted against the inner wall of the first cavity.

10. The pneumatic dovetail fixture of claim 1, wherein: the movable core is sequentially sleeved with a dust ring and a bushing from top to bottom; and a second locating pin is arranged on the dovetail fixing clamp seat.