Aeroelastic conversion power chuck

Abstract

The invention discloses an aeroelastic conversion power chuck which comprises a main shaft, a piston gland is arranged on one side of the main shaft, a chuck clamp is arranged at one end of the piston gland, a line cavity is formed in the middle of the interior of the main shaft, and a piston rod is arranged in the line cavity in a sliding mode. One end of the piston rod penetrates through the piston gland and extends into the chuck clamp, the transmission cavity is formed in the chuck clamp, one end of the piston rod extends into the transmission cavity, and three first moving blocks which are annularly distributed at equal intervals are arranged in the transmission cavity; a second moving block is arranged on one side of each first moving block, and three first guide rods which are annularly distributed at equal intervals are welded to the outer side of the interior of the transmission cavity. According to the aeroelastic conversion power chuck, opening and closing of the clamping jaws are achieved through an aeroelastic conversion mechanism, so that a complex oil way system and a valve device are not needed, and the problems of medium residue and friction loss are effectively avoided.

Description

Technical Field

[0001] The invention relates to the technical field of chucks, in particular to a gas-elastic conversion power chuck. Background Art

[0002] The power chuck is an efficient and automated clamping device widely used in the field of mechanical processing. It uses the energy provided by air pressure, electricity or other power sources to achieve fast and stable clamping of the workpiece through the internal mechanical structure. The design of the power chuck is to improve production efficiency, reduce the workload of operators, and ensure the stability and accuracy of the processing process. The power chuck is widely used and efficient in daily mechanical processing. As a key component in the automated production line, it simplifies the workpiece clamping process and greatly improves the operating efficiency. The operator simply places the workpiece in the center of the chuck and starts it through the control panel or foot switch. The power chuck can respond quickly and use air pressure or electricity to drive the clamping jaws to tightly clamp the workpiece. This process is fast and stable, ensuring the precise positioning of the workpiece during the processing.

[0003] For example, the Chinese authorized patent "A Hydraulic Chuck for Special-Shaped Parts" with announcement number CN118321594B includes: a hydraulic chuck body, on which a plurality of claws are arranged; the hydraulic chuck for special-shaped parts also includes: a clamping support unit, a clamping support unit is arranged at the central part of the hydraulic chuck body, and the clamping support unit can support the inner wall of thin-walled annular and cylindrical parts, and the clamping support unit includes: a fixed plate, on which a fixed plate is fixedly installed at the central part of the hydraulic chuck body; a support table, on one side of the fixed plate a fixed rod is fixedly installed, and on the other end of the fixed rod a support table is fixedly connected, the table surface of the support table is flush with the surface of the hydraulic chuck body, and a plurality of slide grooves are opened on the table surface of the support table, and the number and position of the slide grooves correspond one-to-one to the claws; a support block, each of the slide grooves is slidably connected with a support block.

[0004] Although the above-mentioned prior art can be hydraulically driven, the drainage of hydraulic media such as hydraulic oil is relatively complicated during the process of clamping the workpiece, and after the clamping action is completed, if the hydraulic medium is not promptly and completely discharged from the clamping area, it may cause unnecessary friction with the workpiece or other parts of the chuck when the spindle rotates. This friction will not only increase the loss of the machine and reduce its service life, but may also cause overheating problems due to frictional heat, further affecting the processing accuracy and the overall performance of the equipment. Therefore, it does not meet the existing needs. In this regard, we propose an air-elastic conversion power chuck. Summary of the invention

[0005] The purpose of the present invention is to provide a pneumatic-elastic conversion power chuck to solve the problem in the above background technology that the hydraulic medium of the power chuck is complicated to drain and easy to remain, resulting in friction loss and overheating that affects processing accuracy and equipment performance.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a pneumatic-elastic conversion power chuck, comprising a main shaft, a piston gland is arranged on one side of the main shaft, a chuck fixture is arranged on one end of the piston gland, a cavity is opened at the middle position inside the main shaft, a piston rod is slidably arranged inside the cavity, and one end of the piston rod passes through the piston gland and extends to the inside of the chuck fixture;

[0007] It also includes a transmission cavity, which is opened inside the chuck fixture, and one end of the piston rod extends into the transmission cavity, three first moving blocks distributed in an annular manner and equidistantly are arranged inside the transmission cavity, and a second moving block is arranged on one side of each of the first moving blocks, and three first guide rods distributed in an annular manner and equidistantly are welded on the outer side of the transmission cavity, a second guide rod is arranged on one side of the second moving block, and both ends of the second guide rod are welded and fixed to the transmission cavity, and the second moving block is connected to the second guide rod through a slider, and the slider is slidably matched with the second guide rod;

[0008] It also includes an annular sliding cavity, which is opened on one side of the main shaft, and the annular sliding cavity is connected to the row cavity. A piston plate is arranged inside the annular sliding cavity, the inner wall of the piston plate is connected to the outer wall of the piston rod, and the outer wall of the piston plate is slidably matched with the inner wall of the annular sliding cavity.

[0009] Preferably, one side of the piston gland is provided with six annular grooves which are equidistantly distributed, each of the grooves is provided with a first spring, and one end of each of the first springs is connected to the piston plate.

[0010] Preferably, the first guide rods are connected to the piston rod via an extension plate, the first guide rods penetrate the extension plate, and the first guide rods are slidably matched with the extension plate.

[0011] Preferably, a second spring is sleeved on one side of the exterior of the first guide rod, one end of the second spring is connected to the extension plate, and the other end of the second spring is connected to the transmission chamber.

[0012] Preferably, a third spring is sleeved on one side of the exterior of the second guide rod, one end of the third spring is connected to the slider, and the other end of the third spring is connected to the transmission chamber.

[0013] Preferably, three slide grooves equidistantly distributed in an annular shape are provided on one side of the chuck fixture, a protective shell is provided on the outside of the slide groove, and the protective shell is welded and fixed to the chuck fixture, a third guide rod is welded on the inside of the slide groove, a connecting plate is provided on the outside of the third guide rod, the connecting plate is penetrated by the third guide rod, and the third guide rod and the connecting plate are slidably matched.

[0014] Preferably, three equidistantly distributed L-shaped blocks are provided inside the chuck fixture, a connecting rod is welded on the inner side of the second movable block, the connecting rod passes through and extends to the outside of the transmission cavity, and the connecting rod is slidably matched with the transmission cavity, one end of the connecting rod located outside the transmission cavity is welded and fixed to the L-shaped block, one end of the L-shaped block is provided with a clamping claw, one end of the L-shaped block extends to the interior of the protective shell, and the L-shaped block is slidably matched with the protective shell, and one end of the L-shaped block and the inside of the protective shell are welded and fixed to the connecting plate.

[0015] Preferably, a fourth spring is sleeved on one side of the outside of the third guide rod, one end of the fourth spring is connected to the slide groove, and the other end of the fourth spring is connected to the connecting plate.

[0016] Preferably, a sealing rubber ring is bonded and fixed to one side of the outer wall of the piston rod and the outer wall of the piston plate.

[0017] Preferably, inflation tubes are provided at the upper and lower ends inside the main shaft, and the inflation tubes are communicated with the annular sliding cavity.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention effectively solves the problem that the hydraulic medium of the power chuck is complicated to discharge and easy to remain, resulting in friction loss, overheating and affecting processing accuracy and equipment performance by adopting an air-elastic conversion mechanism. When discharging the hydraulic medium, the traditional hydraulic power chuck often needs to use a complex oil circuit system and valve device, which is not only cumbersome to operate, but also easy to leave residual medium, resulting in friction loss and overheating. The present invention adopts gas as the power source and realizes the opening and closing of the jaws through the air-elastic conversion mechanism. There is no need for a complex oil circuit system and valve device, thereby avoiding the problem of medium residue and friction loss. At the same time, since the gas medium has excellent thermal conductivity and fluidity, it can effectively reduce the operating temperature of the equipment and improve the processing accuracy and equipment performance. This design not only simplifies the structure of the equipment and reduces the cost, but also improves the reliability and service life of the equipment.

[0020] 2. The present invention realizes an efficient and simple gas driving method by setting a sliding cavity, a piston plate, a first spring and related transmission mechanisms. When the gas enters the sliding cavity through the inflation tube, the piston plate is pushed by the gas and moves, and then the air pressure energy is converted into mechanical energy through a series of mechanical transmission structures. This design not only avoids the complex circuits and control devices required for traditional motor driving methods, reducing the complexity and cost of the equipment, but also makes the opening and closing operation of the clamp more stable and reliable through the energy storage and release characteristics of the spring. At the same time, this gas driving method also reduces energy waste and improves the overall energy efficiency of the equipment.

[0021] 3. The present invention arranges transmission structures such as a piston rod, an extension plate, a second spring, and first and second moving blocks between the piston plate and the clamping jaws. These structures together constitute an efficient transmission system. When the piston plate moves, the extension plate will move accordingly and compress or release the second spring through the transmission of the piston rod, and then the opening and closing of the clamping jaws is realized through the squeezing and pushing of the moving block. This design not only makes the opening and closing action of the clamping jaws more stable and smooth, but also can adjust the clamping force according to actual needs, thereby improving the adaptability and flexibility of the equipment.

[0022] 4. The present invention sets a plurality of guide rods and slide grooves in the overall structure of the pneumatic-elastic conversion power chuck, which provide stable support and guidance for the movement of each component. The coordinated use of the guide rods and slide grooves ensures the stability and accuracy of each component during the movement. This design not only improves the overall rigidity and durability of the equipment, but also makes the coordination between the various components more compact and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 2 It is a front view schematic diagram of the internal structure of the present invention;

[0025] Figure 3 It is a schematic side view of the chuck fixture structure of the present invention;

[0026] Figure 4 It is a schematic side view of the internal structure of the main shaft of the present invention;

[0027] Figure 5 For the present invention Figure 2 A partial enlarged view of the middle A area;

[0028] Figure 6 For the present invention Figure 2 A partial enlarged view of the middle B area;

[0029] Figure 7 For the present invention Figure 2A partial enlarged view of the middle C domain.

[0030] In the figure: 1. spindle; 2. piston gland; 3. chuck fixture; 4. piston rod; 5. cavity; 6. sliding cavity; 7. inflation tube; 8. piston plate; 9. sealing rubber ring; 10. groove; 11. first spring; 12. transmission cavity; 13. first moving block; 14. second moving block; 15. first guide rod; 16. second spring; 17. second guide rod; 18. third spring; 19. slider; 20. extension plate; 21. connecting rod; 22. clamping claw; 23. slide groove; 24. protective shell; 25. third guide rod; 26. fourth spring; 27. connecting plate; 28. L-shaped block. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] See also Figure 1-7 The present invention provides an embodiment: a pneumatic-elastic conversion power chuck, comprising a main shaft 1, a piston gland 2 is arranged on one side of the main shaft 1, a chuck fixture 3 is arranged on one end of the piston gland 2, a cavity 5 is opened at the middle position inside the main shaft 1, a piston rod 4 is slidably arranged inside the cavity 5, and one end of the piston rod 4 passes through the piston gland 2 and extends to the inside of the chuck fixture 3;

[0033] It also includes a transmission chamber 12, which is opened inside the chuck fixture 3, and one end of the piston rod 4 extends to the inside of the transmission chamber 12, and three first moving blocks 13 are arranged in an annular and equidistant manner inside the transmission chamber 12, and a second moving block 14 is arranged on one side of the first moving block 13, and three first guide rods 15 are welded on the outside of the transmission chamber 12 and are equidistantly distributed in an annular manner, and a second guide rod 17 is arranged on one side of the second moving block 14, and both ends of the second guide rod 17 are welded and fixed to the transmission chamber 12, and the second moving block 14 is connected to the second guide rod 17 through a slider 19, and the slider 19 is slidably matched with the second guide rod 17;

[0034] It also includes an annular sliding cavity 6, which is opened on one side of the main shaft 1, and the annular sliding cavity 6 is connected to the row cavity 5. A piston plate 8 is arranged inside the annular sliding cavity 6, and the inner wall of the piston plate 8 is connected to the outer wall of the piston rod 4, and the outer wall of the piston plate 8 is slidably matched with the inner wall of the annular sliding cavity 6.

[0035] When in use, air is inflated into the sliding cavity 6 through the air inflating tube 7, and the gas pushes the piston plate 8 to move toward the piston gland 2, compressing the first spring 11, and synchronously driving the piston rod 4 and the extension plate 20 to slide on the first guide rod 15, stretching the second spring 16, and the movement of the extension plate 20 causes the first moving block 13 to squeeze and push the second moving block 14 to move along the second guide rod 17, thereby compressing the third spring 18, and driving the L-shaped block 28 and the clamping claw 22 to move outward and open through the connecting rod 21. At this time, the fourth spring 26 is connected to the The connecting plate 27 slides on the third guide rod 25 and is compressed, and the workpiece can be placed in the opened clamping jaws 22. After the gas pressurization is removed, the elastic force of the first spring 11 and the second spring 16 resets the piston plate 8 and the extension plate 20, and the first moving block 13 releases the squeezing of the second moving block 14. The third spring 18 pushes the L-shaped blocks 28 to move toward each other, and the clamping jaws 22 clamp the workpiece. The fourth spring 26 also helps the L-shaped block 28 to reset to ensure stable clamping. This process discharges the gas medium to avoid loss and overheating when the spindle 1 rotates.

[0036] See also Figure 4 and Figure 5 One side of the piston gland 2 is provided with six annular grooves 10 which are evenly distributed. A first spring 11 is arranged inside the groove 10, and one end of the first spring 11 is connected to the piston plate 8. When the gas enters the sliding cavity 6 through the inflation tube 7 to push the piston plate 8 to move, the first spring 11 can act as a buffer element to effectively absorb and store energy. After the gas pressure disappears, the first spring 11 can quickly release the stored energy to push the piston plate 8 to reset smoothly, thereby ensuring the response speed and stability of the device, and at the same time improving the accuracy and reliability of the clamping action.

[0037] See also Figure 6 and Figure 7 The first guide rod 15 is connected to the piston rod 4 through an extension plate 20. The first guide rod 15 passes through the extension plate 20, and the first guide rod 15 slides with the extension plate 20. The first guide rod 15 provides precise guidance and stable support for the movement of the piston rod 4 and the extension plate 20, effectively preventing clamping errors caused by offset or distortion. At the same time, this structure also enhances the rigidity and durability of the device, ensuring stability and reliability during long-term use.

[0038] See also Figure 7A second spring 16 is sleeved on one side of the outside of the first guide rod 15, one end of the second spring 16 is connected to the extension plate 20, and the other end of the second spring 16 is connected to the transmission chamber 12. When the piston rod 4 drives the extension plate 20 to move, the second spring 16 can absorb and store energy during the movement, providing assistance for the resetting of the extension plate 20, which not only improves the response speed and flexibility of the device, but also can reduce the vibration and noise caused by impact to a certain extent, thereby improving the overall work efficiency and user experience.

[0039] See also Figure 6 A third spring 18 is sleeved on one side of the outside of the second guide rod 17, one end of the third spring 18 is connected to the slider 19, and the other end of the third spring 18 is connected to the transmission chamber 12. The elastic recovery effect of the third spring 18 can make the second moving block 14 drive the L-shaped block 28 to move toward each other, so that the L-shaped block 28 can drive the clamping claw 22 to clamp and fix when discharging the medium.

[0040] See also Figure 2 and Figure 6 One side of the chuck fixture 3 is provided with three slide grooves 23 which are equidistantly distributed in an annular shape. A protective shell 24 is provided on the outside of the slide groove 23, and the protective shell 24 is welded and fixed to the chuck fixture 3. A third guide rod 25 is welded inside the slide groove 23. A connecting plate 27 is provided outside the third guide rod 25. The connecting plate 27 is penetrated by the third guide rod 25, and the third guide rod 25 and the connecting plate 27 are slidably matched. The third guide rod 25 provides stable guidance and support for the movement of the connecting plate 27 and the L-shaped block 28, effectively preventing clamping errors caused by offset or distortion. At the same time, the setting of the protective shell 24 can also prevent dust and debris from entering the interior of the slide groove 23, ensuring the cleanliness and normal operation of the device.

[0041] See also Figure 2 and Figure 6 Three equidistantly distributed L-shaped blocks 28 are arranged inside the chuck fixture 3, a connecting rod 21 is welded on the inner side of the second moving block 14, the connecting rod 21 passes through and extends to the outside of the transmission cavity 12, and the connecting rod 21 slides with the transmission cavity 12, one end of the connecting rod 21 located outside the transmission cavity 12 is welded and fixed to the L-shaped block 28, one end of the L-shaped block 28 is provided with a clamping claw 22, one end of the L-shaped block 28 extends to the inside of the protective shell 24, and the L-shaped block 28 slides with the protective shell 24, and one end of the L-shaped block 28 and the inside of the protective shell 24 are welded and fixed to the connecting plate 27, such an arrangement can convert the movement of the second moving block 14 into the synchronous movement of the L-shaped block 28 and the clamping claw 22, thereby realizing accurate clamping and stable fixation of the workpiece, this design not only improves the accuracy and stability of clamping, but also can adapt to workpieces of different shapes and sizes to a certain extent, enhancing the versatility and practicality of the device.

[0042] See also Figure 6 A fourth spring 26 is sleeved on one side of the outside of the third guide rod 25, one end of the fourth spring 26 is connected to the slide groove 23, and the other end of the fourth spring 26 is connected to the connecting plate 27. When the L-shaped block 28 drives the connecting plate 27 to slide on the third guide rod 25, the fourth spring 26 can absorb and store energy to provide assistance for the resetting of the connecting plate 27 and the L-shaped block 28. This not only improves the response speed and flexibility of the device, but also can reduce the vibration and noise caused by clamping to a certain extent, thereby improving the overall work efficiency and user experience.

[0043] See also Figure 2 and Figure 5 A sealing rubber ring 9 is bonded and fixed to one side of the outer wall of the piston rod 4 and the outer wall of the piston plate 8. The sealing rubber ring 9 can effectively prevent the gas from leaking out from the gap between the piston rod 4 or the piston plate 8 and the sliding cavity 6, thereby ensuring the air tightness and normal operation of the device. At the same time, the sealing rubber ring 9 can also play a role in lubrication and wear reduction, thereby extending the service life and reliability of the device.

[0044] See also Figure 2 An inflation tube 7 is provided at the upper and lower ends of the main shaft 1, and the inflation tube 7 is connected to the annular sliding cavity 6. Gas is filled into the annular sliding cavity 6 through the inflation tube 7, thereby realizing the pushing of the piston plate 8 and the clamping control of the clamping claw 22. The design of the annular sliding cavity 6 can ensure the uniform distribution and flow of gas, thereby improving the efficiency and stability of the device.

[0045] Working principle: When in use, gas is introduced through the inflation tube 7, and the gas will flow into the interior of the sliding cavity 6, thereby pushing the piston plate 8 to move in the direction of the piston gland 2. The movement of the piston plate 8 will compress the first spring 11, and the movement of the piston plate 8 will also synchronously drive the piston rod 4 to move. The piston rod 4 will drive the extension plate 20 to slide synchronously on the first guide rod 15, so that the second spring 16 is stretched. The movement of the extension plate 20 will cause the first moving block 13 to move synchronously and squeeze and push the second moving block 14, so that the second moving block 14 moves outward. The second moving block 14 will compress the third spring 18. The second moving block 14 will drive the L-shaped block 28 to move synchronously through the connection of the connecting rod 21, thereby driving the clamping jaw 22 to move synchronously outward to open the clamping jaw 22. When the L-shaped block 28 moves, it will drive the connecting plate 27 to slide synchronously on the third guide rod 25 and compress the fourth spring 26. At this time, the workpiece can be placed in the opened clamp On the inner side of the claw 22, when the gas pressure is removed, the elastic action of the first spring 11 will cause the piston plate 8 to move to a position away from the workpiece, so that the piston rod 4 can be restored to its position synchronously. When the piston rod 4 is restored to its position, it will drive the extension plate 20 to move synchronously, and the elastic recovery action of the second spring 16 will also cause the extension plate 20 to restore its position. The extension plate 20 will drive the first moving block 13 to move synchronously, and then drive the first moving block 13 to release the squeezing and pushing of the second moving block 14. Under the elastic action of the third spring 18, the second moving block 14 will cause the L-shaped block 28 to move toward each other through the connecting rod 21, and then drive the clamping claw 22 to clamp and fix the workpiece, and at this time, the fourth spring 26 will also restore the position of the L-shaped block 28 through its elastic action, ensuring that the clamping claw 22 is clamped more stably and firmly, so that the gas medium is discharged when the workpiece is clamped, avoiding the loss and overheating caused by the friction of the medium when the spindle 1 rotates.

[0046] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A pneumatic-elastic conversion power chuck, comprising a main shaft (1), a piston gland (2) is arranged on one side of the main shaft (1), a chuck fixture (3) is arranged at one end of the piston gland (2), a cavity (5) is opened at the middle position inside the main shaft (1), a piston rod (4) is slidably arranged inside the cavity (5), and one end of the piston rod (4) passes through the piston gland (2) and extends to the inside of the chuck fixture (3), characterized in that: It also includes a transmission chamber (12), which is opened inside the chuck fixture (3), and one end of the piston rod (4) extends into the transmission chamber (12), three first moving blocks (13) are arranged in an annular shape and are equidistantly distributed inside the transmission chamber (12), and a second moving block (14) is arranged on one side of each of the first moving blocks (13), and three first guide rods (15) are welded on the outer side of the transmission chamber (12) and are equidistantly distributed in an annular shape, and a second guide rod (17) is arranged on one side of each of the second moving blocks (14), and both ends of the second guide rod (17) are welded and fixed to the transmission chamber (12), and the second moving block (14) and the second guide rod (17) are connected via a slider (19), and the slider (19) and the second guide rod (17) are slidably matched; It also includes an annular sliding cavity (6) which is opened on one side of the main shaft (1), and the annular sliding cavity (6) is connected to the row cavity (5), and a piston plate (8) is arranged inside the annular sliding cavity (6), the inner wall of the piston plate (8) is connected to the outer wall of the piston rod (4), and the outer wall of the piston plate (8) is slidably matched with the inner wall of the annular sliding cavity (6).

2. The pneumatic-elastic conversion power chuck according to claim 1, characterized in that: One side of the piston gland (2) is provided with six annular grooves (10) which are evenly distributed. A first spring (11) is arranged inside each of the grooves (10), and one end of each of the first springs (11) is connected to the piston plate (8).

3. The pneumatic-elastic conversion power chuck according to claim 1, characterized in that: The first guide rod (15) and the piston rod (4) are connected via an extension plate (20), the first guide rod (15) passes through the extension plate (20), and the first guide rod (15) is slidably matched with the extension plate (20).

4. The pneumatic-elastic conversion power chuck according to claim 3, characterized in that: A second spring (16) is sleeved on one side of the outside of the first guide rod (15), one end of the second spring (16) is connected to the extension plate (20), and the other end of the second spring (16) is connected to the transmission chamber (12).

5. The pneumatic-elastic conversion power chuck according to claim 1, characterized in that: A third spring (18) is sleeved on one side of the exterior of the second guide rod (17), one end of the third spring (18) is connected to the slider (19), and the other end of the third spring (18) is connected to the transmission chamber (12).

6. The pneumatic-elastic conversion power chuck according to claim 1, characterized in that: One side of the chuck fixture (3) is provided with three slide grooves (23) which are equidistantly distributed in an annular shape. A protective shell (24) is provided outside the slide grooves (23), and the protective shell (24) is welded and fixed to the chuck fixture (3). A third guide rod (25) is welded inside the slide grooves (23). A connecting plate (27) is provided outside the third guide rod (25), and the connecting plate (27) is penetrated by the third guide rod (25). The third guide rod (25) and the connecting plate (27) are slidably matched.

7. The pneumatic-elastic conversion power chuck according to claim 6, characterized in that: The interior of the chuck fixture (3) is provided with three L-shaped blocks (28) distributed at equal intervals. A connecting rod (21) is welded to the inner side of the second movable block (14). The connecting rod (21) passes through and extends to the outside of the transmission cavity (12), and the connecting rod (21) and the transmission cavity (12) are slidably matched. One end of the connecting rod (21) located outside the transmission cavity (12) is welded and fixed to the L-shaped block (28). One end of the L-shaped block (28) is provided with a clamping claw (22). One end of the L-shaped block (28) extends to the inside of the protective shell (24), and the L-shaped block (28) and the protective shell (24) are slidably matched. One end of the L-shaped block (28) and the inside of the protective shell (24) are welded and fixed to the connecting plate (27).

8. The pneumatic-elastic conversion power chuck according to claim 7, characterized in that: A fourth spring (26) is sleeved on one side of the outside of the third guide rod (25), one end of the fourth spring (26) is connected to the slide groove (23), and the other end of the fourth spring (26) is connected to the connecting plate (27).

9. The pneumatic-elastic conversion power chuck according to claim 1, characterized in that: A sealing rubber ring (9) is bonded and fixed to one side of the outer wall of the piston rod (4) and the outer wall of the piston plate (8).

10. The pneumatic-elastic conversion power chuck according to claim 1, characterized in that: The upper and lower ends of the main shaft (1) are both provided with an air filling tube (7), and the air filling tube (7) is communicated with the annular sliding cavity (6).

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