Pneumatic dovetail clamp

Abstract

The present application relates to a kind of pneumatic dovetail clamps, including first mounting seat, second mounting seat, dovetail movable clamp seat, dovetail fixed clamp seat, air inlet, first cavity, connecting rod, oil inlet, oil path, movable core, spring, wedge transmission block, inclined block, air inlet channel, air outlet channel, second cavity, third cavity, guide pin and movable core base, high-pressure gas is passed into air inlet, high-pressure gas is entered into second cavity by air inlet channel, and movable core base, movable core and wedge transmission block are pushed to move upwards in turn, dovetail movable clamp seat moves outward, and pneumatic dovetail clamp loosening action is completed;Air inlet is disconnected, and dovetail movable clamp seat moves inward, and the clamping action of pneumatic dovetail clamp is completed;Ventilation is loose, and clamping is disconnected, response speed is fast, clamping efficiency is high, and the clamping force distribution of blank is uniform.

Description

Technical Field

[0001] This invention relates to the field of clamping technology, and specifically to a pneumatic dovetail clamp. Background Technology

[0002] Workpiece fixtures are an important tool in the production and processing process. Existing fixtures use screws to drive the clamping blocks to move, shortening the distance between the clamping blocks and another clamping surface. Multiple screws and corresponding clamping blocks are required to ensure clamping force. However, when clamping blanks, multiple screws need to be manually screwed in, which is time-consuming and inefficient. Furthermore, the clamping surface formed by multiple clamping blocks is prone to uneven clamping stress. Summary of the Invention

[0003] To address the above problems, the present invention provides a pneumatic dovetail clamp.

[0004] This invention provides the following technical solution: a pneumatic dovetail clamp, comprising a four-axis indexing plate and a pneumatic chuck, wherein the four-axis indexing plate is mounted on a worktable, and the pneumatic chuck is mounted on the four-axis indexing plate, further comprising a clamping mechanism and a first mounting base; the clamping mechanism comprises a second mounting base, a movable core, a spring, and a wedge block, the first mounting base being connected to the pneumatic chuck via a connecting rod; the first mounting base being connected to the second mounting base; a dovetail fixing clamp being connected to the second mounting base; the first mounting base having a first cavity, the bottom of the movable core having a movable core base, and the movable core and the movable core base being integrally formed, the bottom of the movable core base having a second cavity, and the interior of the second mounting base having a third cavity; the movable core base being accommodated in the first cavity, and the side of the movable core base abutting against the inner wall of the first cavity; the movable core being accommodated in the third cavity; the movable core... The base has a first groove, and the bottom of the second mounting seat has a second groove; one end of the spring abuts against the first groove, and the other end abuts against the second groove; the inclined block has an inclined groove, and the end of the movable core away from the base of the movable core is connected to a wedge-shaped transmission block, and the end of the wedge-shaped transmission block away from the movable core is slidably connected to the inclined groove; the inclined block passes through the opening of the third cavity and is connected to a dovetail movable clamp, and the dovetail movable clamp abuts against the dovetail fixed clamp; the dovetail fixed clamp has a slot, and the slot and the dovetail movable clamp cooperate to form a dovetail through groove; the interior of the first mounting seat has an air inlet channel, and the outer wall of the first mounting seat has an air inlet; one end of the air inlet channel communicates with the air inlet, and the other end communicates with the second cavity; the interior of the first mounting seat also has an air outlet channel; one end of the air outlet channel communicates with the first cavity, and the other end communicates with the outside of the first mounting seat.

[0005] Furthermore, the first mounting base can also be a triangular prism, with the first cavity provided on each of the three sides of the triangular prism, and the clamping mechanism connected to each of the first cavities.

[0006] Furthermore, the first mounting base is connected to the second mounting base by a first screw; the second mounting base is connected to the dovetail fixed clamp by a second screw; and the inclined block is connected to the dovetail movable clamp by a third screw.

[0007] Furthermore, the movable core base is provided with at least two first grooves, the bottom of the second mounting base is provided with at least two second grooves, the spring is provided with at least two springs, and the springs are arranged in a circular array with the movable core as the center.

[0008] Furthermore, the outer wall of the second mounting base is provided with an oil inlet; the second mounting base, the inclined block and the wedge-shaped transmission block are all provided with through grooves, and the through grooves of the second mounting base, the inclined block and the wedge-shaped transmission block cooperate with each other to form an oil passage, and the oil passage is connected to the oil inlet.

[0009] Furthermore, it also includes 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 position of the first guide hole; one end of the guide pin is accommodated in the first guide hole, and the other end is accommodated in the second guide hole.

[0010] Furthermore, it also includes a first positioning pin; the second mounting base is provided with a first positioning hole, and the bottom of the dovetail fixing clamp is provided with a second positioning hole corresponding to the position of the first positioning hole; one end of the first positioning pin is located in the first positioning hole, and the other end is located in the second positioning hole; there are at least two first positioning pins.

[0011] Furthermore, the side of the movable core base is provided with a third groove, in which an oil sealing ring is accommodated. 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.

[0012] Furthermore, the movable core is fitted with a dustproof ring and a bushing from top to bottom.

[0013] Furthermore, the dovetail fixing bracket is provided with a second positioning pin.

[0014] Compared with the prior art, the beneficial effects of this invention are as follows: High-pressure gas is introduced into the air inlet, and the high-pressure gas enters the second cavity through the air inlet channel, pushing the movable core base to move upward in the first cavity. The movable core and the wedge-shaped transmission block then move upward together in the third cavity. At the same time, the spring is compressed, and the gas in the first cavity is discharged to the outside through the air outlet channel. The wedge-shaped transmission block slides upward in the inclined groove. Due to the principle of inclined plane transmission, the inclined block moves outward, thereby driving the dovetail movable clamp to move outward, completing the pneumatic dovetail clamp release action. In the dovetail through groove... After the billet is placed in the slot, the air inlet is shut off. Without the thrust of high-pressure air, the movable core base rebounds, causing the movable core base to move downwards. This causes the movable core and the wedge-shaped transmission block to move downwards together. The wedge-shaped transmission block slides downwards in the inclined groove. Due to the principle of inclined plane transmission, the inclined block moves inwards, which in turn causes the dovetail movable clamp to move inwards, clamping the billet between the dovetail movable clamp and the dovetail fixed clamp, thus completing the clamping action of the pneumatic dovetail clamp. It releases when air is supplied and clamps when air is cut off, with a fast response speed, high clamping efficiency, and uniform distribution of clamping force on the billet. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a usage state diagram of Embodiment 1 of the present invention;

[0017] Figure 2 This is a perspective view of Embodiment 1 of the present invention;

[0018] Figure 3 This is a schematic diagram of the clamping mechanism of the present invention;

[0019] Figure 4 This is an exploded view of the clamping mechanism of the present invention;

[0020] Figure 5 This is a cross-sectional view of the clamping mechanism of the present invention after a partial explosion;

[0021] Figure 6 This is a partial cross-sectional view of the clamping mechanism of the present invention;

[0022] Figure 7 This is another partial sectional view of the clamping mechanism of the present invention;

[0023] Figure 8 This is a schematic diagram of the oil circuit of the present invention;

[0024] Figure 9This is a usage state diagram of Embodiment 2 of the present invention;

[0025] Figure 10 This is a schematic diagram of the first mounting base structure in Embodiment 2 of the present invention;

[0026] Figure 11 This is a cross-sectional view of the clamping mechanism in Embodiment 2 of the present invention;

[0027] The names of the components shown in the diagram are as follows:

[0028] 1. Worktable; 2. Four-axis indexing plate; 3. Pneumatic chuck; 4. First mounting base; 5. Second mounting base; 6. Blank; 7. Dovetail movable clamp; 8. Dovetail fixed clamp; 9. Air inlet; 10. First screw; 11. Second screw; 12. Third screw; 13. First locating pin; 14. First cavity; 15. Connecting rod; 16. Oil inlet; 17. Oil passage; 18. Movable core; 19. Spring; 20. Wedge-shaped transmission block; 21. Inclined block; 22. Air inlet channel; 23. Air outlet channel; 24. Bushing; 25. Third cavity; 26. Second locating pin; 27. Movable core base; 28. Sealing ring; 29. ​​Inclined groove; 30. Guide pin; 31. Second cavity; 32. Dustproof ring; 33. First groove; 34. Second groove; 35. Slotting. Detailed Implementation

[0029] The technical solutions of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a portion of the embodiments of this invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0030] Example 1: As Figure 1-5A pneumatic dovetail clamp includes a four-axis indexing plate 2 and a pneumatic chuck 3. The four-axis indexing plate 2 is mounted on a worktable 1, and the pneumatic chuck 3 is mounted on the four-axis indexing plate 2. It also includes a clamping mechanism and a first mounting base 4, which is rectangular. The clamping mechanism includes a second mounting base 5, a movable core 18, a spring 19, and a wedge 21. The first mounting base 4 is connected to the pneumatic chuck 3 via a connecting rod 15. The second mounting base 5 is mounted on the first mounting base 4. A dovetail fixing clamp 8 is connected to the second mounting base 5. A first cavity 14 is provided on one side of the first mounting base 4. A movable core base 27 is provided at the bottom of the movable core 18, and the movable core 18 and the movable core base 27 are integrally formed. The base 27 is housed in the first cavity 14, and the side of the movable core base 27 abuts 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 interior of the second mounting base 5 is provided with a third cavity 25; the movable core 18 is housed in the third cavity 25; the movable core base 27 is provided with at least two first grooves 33, the bottom of the second mounting base 5 is provided with at least two second grooves 34, and at least two springs 19 are provided, arranged in a circular array with the movable core 18 as the center. The number of first grooves 33, the number of second grooves 34, and the number of springs 19 are the same and correspond one-to-one; one end of the spring 19 abuts against the first groove 33, and the other end abuts against the second groove 34. When the pneumatic dovetail clamp is not working, the spring 19 is in a semi-compressed state. When the dovetail movable clamp 7 moves outward, the spring 19 is further compressed, so that the spring rebound force when the air inlet 9 is cut off is greater than the force of natural compression rebound, thus increasing the clamping force. The inclined block 21 is provided with an inclined groove 29. The end of the movable core 18 away from the movable core base 27 is connected to a wedge-shaped transmission block 20. The end of the wedge-shaped transmission block 20 away from the movable core 18 is slidably connected to the inclined groove 29. The inclined block 21 is connected to the dovetail movable clamp 7 through the opening of the third cavity 25. The dovetail movable clamp 7 abuts against the dovetail fixed clamp 8. The dovetail fixed clamp 8 is provided with a slot 35, which cooperates with the dovetail movable clamp 7 to form a dovetail through slot. The first mounting base 4 has an air intake channel 22 inside and an air inlet 9 on its outer wall. One end of the air intake channel 22 is connected to the air inlet 9, and the other end is connected to the second cavity 3124. The first mounting base 4 also has an air outlet channel 23 inside. One end of the air outlet channel 23 is connected to the first cavity 14, and the other end is connected to the outside of the first mounting base 4. The dovetail fixing clamp 8 is provided with a second positioning pin 26. Before processing, a groove that matches the second positioning pin 26 is milled out of the blank. When clamped, the blank is positioned on the dovetail fixing clamp 8 by the second positioning pin 26, which improves the accuracy of blank processing. When clamping is required, a dovetail protrusion and a groove that matches the second positioning pin 26 are milled out of the blank 6 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 upward. The movable core 18 and the wedge-shaped transmission block 20 then move upward together. At the same time, the spring 19 is further compressed from its original compressed state. The gas in the first cavity 14 is discharged to the outside through the air outlet channel 23. The wedge-shaped transmission block 20 slides upward in the inclined groove 29. Due to the principle of inclined plane transmission, the inclined block 21 moves outward, which in turn drives the dovetail movable clamp 7 to move outward, completing the pneumatic dovetail clamp release action. The dovetail protrusion of the billet 6 is placed in the dovetail through groove, so that the air inlet 9 is cut off. The movable core base 27 is not supported by the thrust of high-pressure gas, and the spring 19... The springback causes the movable core base 27 to move downwards, which in turn moves the movable core 18 and the wedge-shaped transmission block 20 downwards together. The wedge-shaped transmission block 20 slides downwards in the inclined groove 29. Due to the principle of inclined plane transmission, the inclined block 21 moves inwards, which in turn moves the dovetail movable clamp 7 inwards, so that the billet 6 is clamped between the dovetail movable clamp 7 and the dovetail fixed clamp 8, completing the clamping action of the pneumatic dovetail clamp. Each surface in the dovetail groove is in contact with the dovetail protrusion, so that the clamping force on the clamped dovetail protrusion is more uniform. At the same time, the shape of the dovetail makes the billet 6 more firmly clamped on the pneumatic dovetail clamp. It releases when air is supplied and clamps when air is cut off, with fast response speed, high clamping efficiency, and uniform distribution of clamping force on the billet 6.

[0031] The first mounting base 4 is connected to the second mounting base 5 by the first screw 10; the second mounting base 5 is connected to the dovetail fixed clamp 8 by the second screw 11; the inclined block 21 is connected to the dovetail movable clamp 7 by the third screw 12; different types of first mounting base 4 can be replaced by removing the first screw 10; different models of dovetail movable clamp 7 and dovetail fixed clamp 8 can be replaced by removing the second screw 11 and the third screw 12, so that blanks 6 of different shapes can be clamped.

[0032] like Figure 4 As shown, the second mounting base 5 is provided with a first positioning hole, and the bottom of the dovetail fixing clamp 8 is provided with a second positioning hole corresponding to the position of the first positioning hole; one end of the first positioning pin 13 is located in the first positioning hole, and the other end is located in the second positioning hole, and there are at least two first positioning pins 13; when assembling the pneumatic dovetail clamp, the position of the dovetail fixing clamp 8 on the second mounting base 5 is first positioned by the first positioning pin 13, and then the dovetail fixing clamp 8 is fixed on the second mounting base 5 by the second screw 11, thereby improving the assembly accuracy.

[0033] like Figure 5As shown, the movable core base 27 has a third groove on its side, in which a sealing ring 28 is accommodated. 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 high-pressure gas enters the second cavity 31 from the air inlet channel 22, the sealing ring 28 blocks the gas, preventing the gas from leaking from the second cavity 31 to the first cavity 14, reducing the thrust of the high-pressure gas on the movable core base 27, and reducing the clamping efficiency.

[0034] like Figure 5 and Figure 7 As shown, the movable core 18 is fitted with a dustproof ring 32 and a bushing 24 from top to bottom. The dustproof ring 32 prevents dust particles from entering the first cavity 14 through the gap between the dovetail movable clamp 7 and the dovetail fixed clamp 8 during operation, which would cause them to collide with the movable core 18, the movable core base 27, and the spring 19, thus reducing their service life. The bushing 24 prevents friction between the movable core 18 and the inner wall of the third cavity 25, which would also reduce the service life of the movable core 18.

[0035] like Figure 6 As shown, the movable core base 27 is provided with a first guide hole, and the bottom of the second mounting base is provided with a second guide hole corresponding to the position of 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 high-pressure gas is introduced into the air inlet 9, the high-pressure gas pushes the movable core base 27 to move upward along the direction of the guide pin 30, and the guide pin 30 makes the movable core base 27 and the movable core 18 move more stably.

[0036] like Figure 8 As shown, the outer wall of the second mounting base 5 is provided with an oil inlet 16; the second mounting base 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 base 5, the inclined block 21 and the wedge-shaped transmission block 20 cooperate with each other to form an oil passage 17, which is connected to the oil inlet 16; when the pneumatic dovetail clamp is working, lubricating oil is introduced into the oil inlet 16, and the lubricating oil lubricates the second mounting base 5, the inclined block 21 and the wedge-shaped transmission block 20 through the oil passage 17, reducing the friction experienced by the second mounting base 5, the inclined block 21 and the wedge-shaped transmission block 20 during operation, extending their service life, and increasing the response speed of the second mounting base 5, the inclined block 21 and the wedge-shaped transmission block 20 during operation, thereby improving the clamping efficiency.

[0037] Workflow of Example 1: The four-axis indexing plate 2 is installed on the worktable 1, the pneumatic chuck 3 is installed on the four-axis indexing plate 2, and the clamping mechanism is installed on the pneumatic chuck 3. When clamping is required, 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 upward. The movable core 18 and the wedge-shaped transmission block 20 then move upward together. At the same time, the spring 19 is compressed, and the air in the first cavity 14 is discharged to the outside through the air outlet channel 23. The wedge-shaped transmission block 20 slides upward in the inclined groove 29. Due to the principle of inclined plane transmission, the inclined block 21 moves outward, which in turn drives the dovetail movable clamp 7 to move outward, completing the pneumatic dovetail clamp release action. After the blank 6 is placed in the dovetail through groove, the air inlet 9 is cut off. The movable core base 27 is not supported by the thrust of high-pressure gas, and the spring 19... The springback causes the movable core base 27 to move downwards, which in turn moves the movable core 18 and the wedge-shaped transmission block 20 downwards together. The wedge-shaped transmission block 20 slides downwards in the inclined groove 29. Due to the principle of inclined plane transmission, the inclined block 21 moves inwards, which in turn moves the dovetail movable clamp 7 inwards, so that the billet 6 is clamped between the dovetail movable clamp 7 and the dovetail fixed clamp 8, completing the clamping action of the pneumatic dovetail clamp. It releases when air is supplied and clamps when air is cut off, with fast response speed, high clamping efficiency, and uniform distribution of clamping force on the billet 6. If it is necessary to clamp other shapes of billets 6, the dovetail movable clamp 7 and dovetail fixed clamp 8 suitable for the shape of the billet 6 can be replaced by removing the second screw 11 and the third screw 12. After the billet 6 is clamped, the machine tool processes the billet 6. By rotating the four-axis indexing plate 2, different surfaces of the billet 6 can be processed in one clamping.

[0038] Example 2:

[0039] like Figure 9-11 As shown, unlike Embodiment 1, the first mounting base 4 is a triangular prism. The three sides of the first mounting base 4 are provided with a first cavity 14, and a clamping mechanism is connected to each of the first cavities 14. Through the triangular prism first mounting base 4, multiple blanks 6 can be processed at once, increasing processing efficiency.

[0040] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "upper," "lower," "left," "right," "front," "back," and similar expressions used in this document are for illustrative purposes only.

Claims

1. A pneumatic dovetail clamp, comprising a four-axis indexing plate and a pneumatic chuck, wherein the four-axis indexing plate is mounted on a worktable, and the pneumatic chuck is mounted on the four-axis indexing plate, characterized in that: It also includes a clamping mechanism and a first mounting base; the clamping mechanism includes a second mounting base, a movable core, a spring, and a wedge block; the first mounting base is connected to the pneumatic chuck via a connecting rod; the second mounting base is mounted on the first mounting base; a dovetail fixing clamp is connected to the second mounting base; the first mounting base has a first cavity; the bottom of the movable core has a movable core base, and the movable core and the movable core base are integrally formed; the movable core base is housed in the first cavity, and the side of the movable core base abuts against the inner wall of the first cavity; the bottom of the movable core base has a second cavity, and the interior of the second mounting base has a third cavity; the movable core is housed in the third cavity; the movable core base has a first groove, and the bottom of the second mounting base has a second groove; the spring... One end abuts against the first groove, and the other end abuts against the second groove; the inclined block is provided with an inclined groove, and the end of the movable core away from the movable core base is connected to a wedge-shaped transmission block, and the end of the wedge-shaped transmission block away from the movable core is slidably connected to the inclined groove; the inclined block passes through the opening of the third cavity and is connected to a dovetail movable clamp, and the dovetail movable clamp abuts against the dovetail fixed clamp; the dovetail fixed clamp is provided with a slot, and the slot and the dovetail movable clamp cooperate to form a dovetail through groove; the interior of the first mounting base is provided with an air inlet channel, and the outer wall of the first mounting base is provided with an air inlet; one end of the air inlet channel is connected to the air inlet, and the other end is connected to the second cavity; the interior of the first mounting base is also provided with an air outlet channel; one end of the air outlet channel is connected to the first cavity, and the other end is connected to the outside of the first mounting base; The outer wall of the second mounting base is provided with an oil inlet; the second mounting base, the inclined block and the wedge-shaped transmission block are all provided with through grooves, and the through grooves of the second mounting base, the inclined block and the wedge-shaped transmission block cooperate with each other to form an oil passage, and the oil passage is connected to the oil inlet; When the pneumatic dovetail clamp is working, lubricating oil is introduced into the oil inlet. The lubricating oil lubricates the second mounting base, the inclined block and the wedge-shaped transmission block through the oil circuit, reducing the friction on the second mounting base, the inclined block and the wedge-shaped transmission block during operation, extending their service life, and increasing the response speed of the second mounting base, the inclined block and the wedge-shaped transmission block during operation, thereby improving clamping efficiency. Workflow: The four-axis indexing plate is mounted on the worktable, the pneumatic chuck is mounted on the four-axis indexing plate, and the clamping mechanism is mounted on the pneumatic chuck. When clamping is required, high-pressure gas is introduced into the air inlet. The high-pressure gas enters the second cavity through the air inlet channel and pushes the movable core base upward. The movable core and the wedge-shaped transmission block then move upward together. Simultaneously, the spring is compressed, and the air in the first cavity is discharged to the outside through the air outlet channel. The wedge-shaped transmission block slides upward in the inclined groove. Due to the principle of inclined plane transmission, the inclined block moves outward, thus... The dovetail movable clamp moves outward, completing the pneumatic dovetail clamp release action; after the billet is placed in the dovetail through slot, the air inlet is cut off, and the movable core base is no longer supported by the thrust of high-pressure air. The spring rebounds, causing the movable core base to move down, which in turn causes the movable core and the wedge-shaped transmission block to move down together. The wedge-shaped transmission block slides down in the inclined slot. Due to the principle of inclined plane transmission, the inclined block moves inward, which in turn causes the dovetail movable clamp to move inward, so that the billet is clamped between the dovetail movable clamp and the dovetail fixed clamp, completing the clamping action of the pneumatic dovetail clamp. The machine releases when air is supplied and clamps when air is cut off, offering a fast response and high clamping efficiency, with uniform clamping force distribution on the billet. If other shapes of billets need to be clamped, the second and third screws can be removed to replace them with dovetail movable clamps and dovetail fixed clamps suitable for the billet shape. After clamping the billet, the machine tool processes it by rotating the four-axis indexing plate to process different surfaces of the billet in a single clamping operation.

2. The pneumatic dovetail clamp according to claim 1, characterized in that: The first mounting base is rectangular, and the first cavity is located on one of the surfaces of the first mounting base.

3. The pneumatic dovetail clamp according to claim 1, characterized in that: The first mounting base is a triangular prism, and the first cavity is provided on each of the three sides of the first mounting base. The clamping mechanism is connected to each of the first cavities.

4. The pneumatic dovetail clamp according to claim 1, characterized in that: The first mounting base is connected to the second mounting base by a first screw; the second mounting base is connected to the dovetail fixed clamp by a second screw; the inclined block is connected to the dovetail movable clamp by a third screw.

5. The pneumatic dovetail clamp according to claim 1, characterized in that: The movable core base is provided with multiple first grooves, the bottom of the second mounting base is provided with multiple second grooves, and multiple springs are provided, which are arranged in a circular array with the movable core as the center. The number of first grooves, the number of second grooves and the number of springs are the same and correspond one-to-one.

6. The pneumatic dovetail clamp according to claim 1, characterized in that: It also includes a guide pin; the movable core base is provided with a first guide hole, and the bottom of the second mounting base is provided with a second guide hole corresponding to the position of the first guide hole; one end of the guide pin is accommodated in the first guide hole, and the other end is accommodated in the second guide hole.

7. The pneumatic dovetail clamp according to claim 1, characterized in that: It also includes a first positioning pin; the second mounting base is provided with a first positioning hole, and the bottom of the dovetail fixing clamp is provided with a second positioning hole corresponding to the position of the first positioning hole; one end of the first positioning pin is located in the first positioning hole, and the other end is located in the second positioning hole; there are multiple first positioning pins.

8. The pneumatic dovetail clamp according to claim 1, characterized in that: The movable core base has a third groove on its side, in which a sealing ring is accommodated. 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.

9. The pneumatic dovetail clamp according to claim 1, characterized in that: The movable core is fitted with a dustproof ring and a bushing from top to bottom; the dovetail fixing bracket is provided with a second positioning pin.

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