A pneumatic grinder chuck

Abstract

The present invention discloses a pneumatic grinding machine chuck, which relates to the technical field of chucks. By arranging a swinging clamping component, when clamping a workpiece, the clamping component changes less during the swinging process, so that during the clamping process, the deformation of the workpiece can be reduced. Three clamping components are arranged to clamp the workpiece at the same time, and matching ejectors are arranged. During clamping and processing, the clamped workpiece can be subjected to more uniform force, further reducing the deformation of the workpiece. An air chamber is arranged at the disk body, and a gas-type driving component is arranged. After the jacking component at the disk body introduces gas into the air chamber, the corresponding clamping component can be driven more synchronously, so that the clamping component can clamp the workpiece more synchronously, so that the workpiece is subjected to more uniform force, further reducing the deformation of the workpiece, and improving the overall quality of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of chucks, and more particularly to a pneumatic grinding machine chuck. Background Art

[0002] A grinding machine is a machine tool for machining the surface of a workpiece with a grinding tool. A chuck is a device provided on the grinding machine to fix the workpiece. The chuck can position and fix the workpiece, reduce the situation of machining misalignment caused by workpiece offset during machining, and improve the accuracy during machining.

[0003] An external cylindrical grinding machine is a grinding machine commonly used for machining conical and cylindrical workpieces and is the most widely used. Common chucks can be used when machining cylindrical and conical workpieces. However, in the prior art, the workpiece is usually directly placed on the chuck, and then the mechanism on the chuck slides to the side of the workpiece at the same time to clamp it. During clamping and machining, it is easy to have situations such as excessive force or uneven force, resulting in machining misalignment or workpiece deformation, which has a certain impact on the quality of the product. Summary of the Invention

[0004] To solve the problem that in the prior art, the workpiece is usually directly placed on the chuck, and then the mechanism on the chuck slides to the side of the workpiece at the same time to clamp it. During clamping and machining, it is easy to have uneven force, resulting in machining misalignment or workpiece deformation, which has a certain impact on the quality of the product, the present application provides a pneumatic grinding machine chuck.

[0005] A pneumatic grinding machine chuck includes a disc body. A clamping seat is provided on the disc body. A center position of the clamping seat is provided with a center pin, and the center pin is arranged towards the end away from the disc body. A clamping assembly is further provided on the clamping seat, and three clamping assemblies are circumferentially and spaced apart around the center pin;

[0006] The clamping assembly is rotatably connected to the clamping seat. A driving assembly is provided on the disc body. The driving assembly corresponds to the clamping assembly and is arranged at the end of the clamping assembly away from the center pin. The driving assembly is used to simultaneously drive the three clamping assemblies to swing along the rotation connection point;

[0007] In the normal state, the clamping assembly is inclined, and the side of the clamping assembly close to the center pin is higher than the side away from the center pin. When the driving assembly works, the end of the clamping assembly away from the center pin moves in the direction away from the clamping seat, and the end of the clamping assembly close to the center pin moves in the direction close to the clamping seat.

[0008] By adopting the above technical solutions, in the normal state, the three clamping components are all inclined upward, and the gaps between the upwardly inclined clamping components are relatively large. At this time, the workpiece to be processed can be placed at the ejector pin between the three workpieces to be processed. Subsequently, the driving component works, and the three clamping components can rotate simultaneously along the hinge points. The end of the clamping component close to the ejector pin moves towards the direction close to the chuck. The gaps between the three clamping components gradually narrow. During the rotation process, the clamping components can clamp the workpiece to be processed with a small change, reducing the extrusion distance of the workpiece to reduce the impact on the workpiece during the change process, reducing the deformation of the workpiece. Even when one clamping component moves out of sync, the force at the unevenly stressed part is also small, further reducing the deformation of the workpiece. When feeding onto the ejector pin, it is also relatively stable, reducing the damage of the ejector pin. During processing, the stress point of the workpiece under the action of the ejector pin is also small. The side of the workpiece opposite to the ejector pin contacts the grinding tool for processing. Since the contact area between the workpiece and the ejector pin is small, it reduces the deformation caused by uneven stress at each processing point when the grinding tool is squeezed and directly contacts the chuck, thereby improving the overall quality of the product.

[0009] Optionally, a closed air chamber is provided in the disc body. The driving component includes an air inlet pipe. A supporting component is also provided on the disc body. The supporting component is arranged corresponding to the clamping component. The supporting component is slidably connected to the disc body. One end of the supporting component extends into the air chamber, and the other end faces the clamping component. The air inlet pipe is used to inject gas into the air chamber. After the gas is injected, the supporting component is pushed by the gas and moves towards the clamping component.

[0010] By adopting the above technical solutions, an air chamber is opened in the disc body. After gas is injected into the air chamber, the supporting components corresponding to the three clamping components can be simultaneously lifted by the gas and move towards the clamping components. Since the gas diffuses evenly and quickly after injection, a pressure difference can be formed to make the three supporting components move towards the clamping components relatively synchronously, reducing the situation of uneven stress when clamping the workpiece.

[0011] Optionally, the supporting component includes a supporting plate and a supporting column. The supporting column is arranged on the supporting plate and extends out of the supporting plate. The supporting column is arranged on the side close to the ejector pin. A transition block is arranged on the end of the clamping component away from the ejector pin facing the supporting plate. The transition block is arc-shaped. In the normal state, the supporting plate abuts against the clamping component. After the driving component works, the transition block still abuts against the supporting plate, and the supporting column abuts against the clamping component.

[0012] By adopting the above technical solution, a top support plate and a top support column are provided, and the top support column extends out of the top support plate. In the normal state, the transition block of the clamping assembly can abut against the top support plate to fix the clamping assembly, reducing the shaking of the clamping assembly. When the driving assembly works, the arc-shaped transition block can reduce the interference formed between the two during the movement of the top support plate, so that the top support plate can normally lift and rotate the clamping assembly. When the clamping assembly rotates a certain angle, the clamping assembly abuts against the top support column, and the top support column can limit the further rotation of the clamping assembly, reducing the situation of excessive clamping and the deformation of the workpiece due to clamping. It can also assist in positioning the clamping assembly, reducing the shaking of the clamping assembly during clamping and improving the stability of clamping.

[0013] Optionally, a connecting elastic member is provided between the clamping assembly and the top support plate. One end of the connecting elastic member is fixedly connected to the clamping assembly, and the other end is fixedly connected to the top support plate. The connecting elastic member has a tendency to pull the clamping assembly and the top support plate to move towards each other.

[0014] By adopting the above technical solution, a connecting elastic member is provided between the clamping assembly and the top support plate, and both ends of the elastic member connect the top support plate and the clamping assembly. It can not only reduce the situation that the clamping assembly is lifted and separated due to excessive force during driving clamping, but also reduce the situation that the top support plate moves too fast and disengages from the abutment with the clamping assembly when releasing the clamping, resulting in the shaking of the clamping assembly, making the overall clamping more stable.

[0015] Optionally, the top support assembly further includes a moving column. The moving column is slidably connected to the disc body. The upper part of the moving column is fixedly connected to the top support plate. A pressure-bearing disc is provided at the lower part of the moving column. The pressure-bearing disc is fixedly connected to the moving column. A guide tube is provided on the disc body facing the air chamber. The pressure-bearing disc is slidably connected in the guide tube. A sealing ring is provided on the pressure-bearing disc. One side of the sealing ring abuts against the pressure-bearing disc, and the other side abuts against the inner wall of the guide tube.

[0016] By adopting the above technical solution, the moving column and the pressure-bearing disc are provided. The pressure-bearing disc in the air chamber can drive the moving column to slide under the push of the gas. During the movement of the moving column, the pressure-bearing disc cannot slide out of the air chamber, thus limiting the moving range of the moving column. A guide tube corresponding to the pressure-bearing disc is provided, and a sealing ring is provided between the guide tube and the pressure-bearing disc to increase the airtightness in the air chamber, so that the pressure-bearing disc can displace more stably under the drive of the gas.

[0017] Optionally, a reset elastic member is provided on the pressure-bearing disc. One end of the reset elastic member is fixedly connected to the pressure-bearing disc, and the other end is fixedly connected to the inner wall of the disc body. The reset elastic member has a tendency to push the pressure-bearing disc to move away from the clamping assembly.

[0018] By adopting the above technical solution, the reset elastic member can move the pressure-bearing plate away from the clamping assembly after the gas stops being introduced, so that the pressure-bearing plate drives the moving column to move away from the assembly, assisting the pressure-bearing plate to drive the abutting plate to reset, improving the efficiency when releasing the workpiece, and further improving the overall clamping.

[0019] Optionally, the clamping assembly includes a claw base and a claw head. The claw base is hinged to the clamping seat. The transition block is arranged on the claw base. A waist-shaped groove is formed in the claw head. A bolt passes through the waist-shaped groove and is threadedly connected to the claw base. The claw head abuts against the bolt head.

[0020] By adopting the above technical solution, a waist-shaped groove is formed in the claw head, and the claw head can be adjusted within a certain range. After the bolt passes through the waist-shaped groove, it is threadedly connected to the claw base. The claw head can be tightened against the claw base by the bolt head. The adjustable setting enables the claw head to be finely adjusted when clamping workpieces of different sizes, thereby improving the versatility.

[0021] Optionally, one end of the claw head facing the thimble is provided with a guiding surface and an abutting surface. The abutting surface is arranged corresponding to the position of the thimble. The abutting surface is used to abut against the workpiece. The guiding surface is inclined from the side wall of the claw head towards the abutting surface. After the workpiece is fed into the guiding surface, it is sent to the abutting surface through the guiding surface.

[0022] By adopting the above technical solution, the claw head is also provided with an abutting surface and a guiding surface. When the workpiece is fed, it can be fed from the guiding surface to the abutting surface arranged corresponding to the thimble. The abutting surface arranged corresponding to the position of the thimble can make the force application point of the clamping more corresponding to the thimble, so that the force on the workpiece is more uniform, and further reducing the deformation of the workpiece.

[0023] Optionally, an adjusting rod is further arranged on the claw base. The adjusting rod is threadedly connected to the claw base. After passing through the claw base, the adjusting rod faces the claw head and is used to abut against the claw head. A fixing nut is further arranged on the adjusting rod. The fixing nut is threadedly connected to the adjusting rod and is used to tighten against the claw base.

[0024] By adopting the above technical solution, an adjusting rod is arranged on the claw base. By rotating to move the adjusting rod, it can assist in adjusting the position of the claw head, and after the adjustment is completed, the adjusting rod still has a certain fixing effect on the claw head, which can improve the stability of the claw head.

[0025] Optionally, the thimble is rotatably connected to the clamping seat.

[0026] By adopting the above technical solution, the thimble is rotatably connected to the chuck. Since the chuck needs to rotate during processing, the thimble rotates with the chuck, and it is easy for the workpiece to be processed to shift on the thimble, and even further interference may occur. Therefore, the thimble is rotatably connected to the chuck, so that the thimble does not rotate with the chuck, thereby reducing the interference of the thimble on the workpiece during processing.

[0027] In summary, the present application has at least the following beneficial effects:

[0028] The present application solves the problem that in the prior art, the chuck usually directly places the workpiece on the chuck, and then the mechanism on the chuck slides to the side of the workpiece at the same time to clamp it. During clamping and processing, it is easy to have uneven stress, resulting in processing misalignment or workpiece deformation, etc., which has a certain impact on the quality of the product. The present application sets three clamping components that clamp the product in a swinging form to reduce the change distance of the clamping components, thereby reducing the deformation of the workpiece under pressure during clamping, and sets a thimble that cooperates with the clamping components, so that the stress of the workpiece during processing is more uniform, reducing the deformation of the workpiece due to uneven stress during processing, thereby improving the quality of the workpiece.

[0029] The present application also sets an air chamber to drive the top support component by introducing gas. Each drive component can be lifted more synchronously in the air chamber to drive the clamping component to clamp the workpiece, and the workpiece is more evenly stressed when being clamped, thereby further reducing the deformation of the workpiece. Description of the Drawings

[0030] Figure 1 is a perspective view of this embodiment, mainly used to show the connection situation of the intake pipe and the gas pipeline.

[0031] Figure 2 is a perspective view of the disk body in this embodiment.

[0032] Figure 3 is a cross-sectional view of the disk body in this embodiment.

[0033] Description of the Reference Numerals:

[0034] 1. Disk body; 11. Air chamber; 12. Guide pipe;

[0035] 2. Chuck; 21. Thimble; 22. Hinge frame; 23. Bearing;

[0036] 3. Clamping component; 31. Claw base; 311. Mounting block; 312. Adjusting rod; 313. Fixed nut; 314. Transition block; 315. Mounting rod; 32. Claw head; 321. Kidney-shaped groove; 322. Guide surface; 323. Contact surface;

[0037] 4. Driving component; 41. Intake pipe; 411. Sealing bowl; 412. Gas flow channel;

[0038] 5. Jacking component; 51. Moving column; 511. Jacking plate; 512. Pressure-bearing disc; 513. Jacking column;

[0039] 6. Sealing ring; 7. Connecting elastic member; 8. Reset elastic member. Detailed implementation manners

[0040] The following further details the present application Figures 1-3 through specific embodiments in conjunction with the accompanying

[0041] A pneumatic grinder chuck, as Figure 1 and Figure 2 shown, includes a disc body 1. A chuck 2 is arranged on the upper side of the disc body 1, and the chuck 2 is fixedly connected to the disc body 1. There is a center punch 21 at the center position of the chuck 2, and the tip of the center punch 21 is arranged towards the end away from the chuck 2. A clamping assembly 3 is arranged on the chuck 2, and three clamping assemblies 3 are circumferentially and spaced apart around the center punch 21. As Figure 3 shown in, the chuck 2 is provided with a bearing 23 corresponding to the center punch 21, the bearing 23 is fixed on the chuck 2, and the center punch 21 is rotatably connected to the chuck 2 by means of the bearing 23. During specific implementation, the tip of the center punch 21 is used to cooperate with the clamping assembly 3 to clamp the workpiece. During processing, the chuck 2 will rotate, and the center punch 21 will be in a free state due to its rotational connection, reducing the interference of the center punch 21 with the workpiece as the chuck 2 rotates.

[0042] As Figure 2 and Figure 3 shown, the clamping assembly 3 includes a jaw base 31 and a jaw head 32. The chuck 2 is provided with a hinge bracket 22 corresponding to the jaw base 31, the hinge bracket 22 is arranged close to the center punch 21, one end of the jaw base 31 is hinged on the hinge bracket 22, and the other end of the jaw base 31 can swing along the hinge point. The jaw head 32 is arranged at one end of the jaw base 31 close to the center punch 21, and the jaw head 32 extends towards the center punch 21 along the length direction of the jaw base 31. During specific implementation, in the normal state, the clamping assembly 3 is integrally inclined, the side of the clamping assembly 3 close to the center punch 21 is higher than the side away from the center punch 21. When clamping, only need to simultaneously push the three jaw bases 31 to rotate towards the center punch 21 side, reducing the distance between the three jaw heads 32 to clamp the workpiece. In other embodiments, the clamping assembly 3 can also adopt an integrally arranged jaw, or other blocks with the same pressing effect in other shapes, which can all clamp the workpiece.

[0043] As Figure 2 and Figure 3As shown, a non-through waist-shaped groove 321 is formed on the claw head 32. The waist-shaped groove 321 is arranged along the length direction of the claw head 32. A bolt is arranged in the waist-shaped groove 321. When the bolt passes through the waist-shaped groove 321 and is threadedly connected to the claw seat 31. During specific implementation, the waist-shaped groove 321 of the claw head 32 enables the claw head 32 to be adjusted within a certain range on the claw seat 31, and can be finely adjusted according to workpieces of different sizes to improve the versatility.

[0044] As Figure 2 and Figure 3 shown, an installation block 311 is integrally arranged at one end of the claw seat 31 far from the thimble 21. An adjusting rod 312 is threadedly connected to the installation block 311. The adjusting rod 312 passes through the installation block 311 of the claw seat 31 and is arranged towards the claw head 32. A fixing nut 313 is threadedly connected to the adjusting rod 312. During specific implementation, after the adjusting rod 312 rotates, it can move towards the claw head 32 to push the claw head 32 to assist in the adjustment of the claw head 32. When the adjustment is completed, the claw head 32 can be fixed on the claw seat 31 through the bolt, and the adjusting rod 312 can press against the claw head 32 to increase the fixing property. After the fixing nut 313 rotates, it can abut against the installation block 311 of the claw seat 31, and the rotation of the adjusting rod 312 can be restricted by increasing the friction force.

[0045] As Figure 2 and Figure 3 shown, a guiding surface 322 and an abutting surface 323 are arranged at one end of the claw head 32 facing the thimble 21. The abutting surface 323 is arranged corresponding to the position of the thimble 21. The guiding surface 322 is inclined from the side wall of the claw head 32 towards the abutting surface 323. During specific implementation, when the workpiece is fed in, it can move along the guiding surface 322 and then be transferred to the abutting surface 323 through the transition of the guiding surface 322. The abutting surface 323 is used to abut against the workpiece.

[0046] As Figure 2 and Figure 3As shown in the figure, a jacking component 5 and a driving component 4 are arranged on the disk body 1. The jacking component 5 is arranged corresponding to the position and quantity of the clamping component 3. The driving component 4 is slidably arranged on the disk body 1. The driving component 4 includes an air inlet pipe 41, and the air inlet pipe 41 is fixedly connected to the disk body 1. A closed bowl 411 is fixedly connected to the air inlet pipe 41. The closed bowl 411 is fixedly connected to the disk body 1. The closed bowl 411 and the disk body 1 cooperate to form a closed air chamber 11. A sealing ring 6 is arranged at the cooperation position of the closed bowl 411 and the disk body 1 to improve the sealing performance of the air chamber 11. The air inlet pipe 41 extends into the air chamber 11, and a gas flow channel 412 for gas circulation is opened at the air inlet pipe 41. The gas flow channel 412 is communicated with the air chamber 11. During specific implementation, the end of the air inlet pipe 41 away from the disk body 1 faces the inside of the air chamber 11 to introduce gas through the gas flow channel 412, and the driving component 4 is simultaneously jacked up, so as to jack up the corresponding clamping component 3 to clamp the workpiece. In other embodiments, the driving component 4 can also adopt a hydraulic pipe, and the air chamber 11 is correspondingly changed to an oil chamber. The pressure-bearing disk 512 is jacked up by oil pressure drive. The oil pressure drive method has higher driving efficiency. It can also adopt an electric form, and the pressure-bearing disk 512 is simultaneously jacked up by an electric rod for driving. The electric method has higher controllability and lower cost.

[0047] As Figure 2 and Figure 3 shown in the figure, a jacking component 5 is arranged on the disk body 1. The jacking component 5 is arranged corresponding to the quantity and position of the clamping component 3. The jacking component 5 includes a moving column 51. The moving column 51 is slidably connected to the disk body 1 and is arranged below the claw seat 31. One end of the moving column 51 close to the claw seat 31 is fixedly connected with a jacking plate 511. The other end of the moving column 51 extends into the air chamber 11 and is fixedly connected with a pressure-bearing disk 512. The diameter of the pressure-bearing disk 512 is larger than that of the moving column 51. Therefore, the pressure-bearing disk 512 cannot be disengaged from the air chamber 11. A guide pipe 12 is arranged in the air chamber 11 of the disk body 1 corresponding to the pressure-bearing disk 512. The pressure-bearing disk 512 is slidably connected with the guide pipe 12. A sealing ring 6 is arranged between the pressure-bearing disk 512 and the guide pipe 12. One side of the sealing ring 6 abuts against the pressure-bearing disk 512, and the other side abuts against the inner wall of the guide pipe 12. During specific implementation, the jacking plate 511 supports one end of the claw seat 31 away from the ejector pin 21, so that the claw seat 31 is in an inclined state under normal conditions. After gas is introduced into the air chamber 11, the three pressure-bearing disks 512 are simultaneously pressed to push the moving column 51 to move towards the claw seat 31, and the jacking plate 511 then pushes the claw seat 31, so that the claw seat 31 swings to perform a clamping action. In other embodiments, the pressure-bearing disks 512 of the three jacking components 5 can be integrally arranged, and the integral arrangement is more synchronous when jacking up the clamping component 3.

[0048] As Figure 2 and Figure 3As shown, on the top support plate 511, two top support columns 513 protrude towards the claw seat 31 on the side close to the ejector pin 21, and both of the two top support columns 513 are fixedly connected to the top support plate 511. One end of the claw seat 31 away from the ejector pin 21 is provided with a transition block 314 towards the top support plate 511. The transition block 314 is arranged in an arc shape, and the arc-shaped transition block 314 can reduce the interference formed between the two when the top support plate 511 moves. During specific implementation, in the normal state, the claw seat 31 is affected by gravity, and the transition block 314 of the claw seat 31 abuts against the top support plate 511, and the top support columns 513 on the top support plate 511 do not directly contact the claw seat 31. When the top support plate 511 moves towards the claw seat 31, the two top support columns 513 abut against the claw seat 31, and the two top support columns 513 cooperate to limit the rotation of the claw seat 31. When the top support plate 511 moves upward further, it cannot continue to push the claw seat 31 to rotate. At this time, the transition block 314 still abuts against the top support plate 511.

[0049] As Figure 2 and Figure 3 shown, two connecting elastic members 7 are arranged between the claw seat 31 of the clamping assembly 3 and the top support plate 511. Corresponding mounting rods 315 are fixedly installed on both side walls of the claw seat 31 and the top support plate 511. One end of the connecting elastic member 7 is fixedly connected to the mounting rod 315 on the claw seat 31, and the other end is fixedly connected to the mounting rod 315 on the top support plate 511. During specific implementation, the connecting elastic member 7 includes a spring, a rubber strip, etc. In this embodiment, a spring is adopted. The connecting elastic member 7 has a tendency to pull the claw seat 31 and the top support plate 511 to move towards each other.

[0050] As Figure 2 and Figure 3 shown, a reset elastic member 8 is arranged on the pressure-bearing disc 512. One end of the reset elastic member 8 is fixedly connected to the pressure-bearing disc 512, and the other end is fixedly connected to the inner wall of the disc body 1 at the top of the air chamber 11. During specific implementation, the reset elastic member 8 includes a spring, a rubber strip, etc. In this embodiment, a spring is adopted. The reset elastic member 8 has a tendency to push the pressure-bearing disc 512 to move away from the clamping assembly 3, thereby assisting in the overall reset of the top support assembly 5.

[0051] Working principle: The workpiece is sent to the position corresponding to the center pins 21 between the three clamping components 3. The driving component 4 introduces gas into the air chamber 11 to drive the supporting component 5. The supporting plates 511 of each supporting component 5 synchronously lift the claw seats 31, and the claw heads 32 rotate synchronously along the hinge points. The distance between the claw heads 32 decreases, thereby clamping the workpiece located between the claw heads 32. Since the distance changed by the claw heads 32 under swinging is small, the deformation caused by squeezing the workpiece during clamping is reduced. During machining, since the workpiece is clamped from three sides simultaneously and the force application point of the center pin 21 is small, the overall force on the workpiece is relatively uniform, and the reaction force received by the workpiece from the center pin 21 is also small, reducing the deformation of the workpiece caused by uneven force during machining, thereby improving the quality of the workpiece.

[0052] The above is the preferred embodiment of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A pneumatic grinding machine chuck, characterized in that: It includes a disk body (1), a clamping seat (2) is provided on the disk body (1), a thimble (21) is provided at the central position of the clamping seat (2), the thimble (21) is arranged towards the end away from the disk body (1), and a clamping assembly (3) is further provided on the clamping seat (2), and three clamping assemblies (3) are circumferentially and spaced apart around the thimble (21); The clamping assembly (3) is rotatably connected to the clamping seat (2), a driving assembly (4) is provided on the disk body (1), the driving assembly (4) is arranged corresponding to the clamping assembly (3), the driving assembly (4) is arranged at the end of the clamping assembly (3) away from the thimble (21), and the driving assembly (4) is used to simultaneously drive the three clamping assemblies (3) to swing around the rotation connection point; In the normal state, the clamping assembly (3) is inclined, the side of the clamping assembly (3) close to the thimble (21) is higher than the side away from the thimble (21), when the driving assembly (4) works, the end of the clamping assembly (3) away from the thimble (21) moves in the direction away from the clamping seat (2), and the end of the clamping assembly (3) close to the thimble (21) moves in the direction close to the clamping seat (2); A closed air chamber (11) is provided at the disk body (1), the driving assembly (4) includes an air inlet pipe (41), a top support assembly (5) is further provided on the disk body (1), the top support assembly (5) is arranged corresponding to the clamping assembly (3), the top support assembly (5) is slidably connected to the disk body (1), one end of the top support assembly (5) extends into the air chamber (11), and the other end is arranged towards the clamping assembly (3), and the air inlet pipe (41) is used to inject gas into the air chamber (11), and after the gas is injected, the top support assembly (5) is pushed by the gas to move towards the clamping assembly (3); The top support assembly (5) includes a top support plate (511) and a top support column (513), the top support column (513) is provided on the top support plate (511) and extends out of the top support plate (511), the top support column (513) is arranged on the side close to the thimble (21), and a transition block (314) is arranged at the end of the clamping assembly (3) away from the thimble (21) towards the top support plate (511), the transition block (314) is arranged in an arc shape, in the normal state, the top support plate (511) abuts against the clamping assembly (3), after the driving assembly (4) works, the transition block (314) is separated from the top support plate (511), and the top support column (513) abuts against the clamping assembly (3); A connecting elastic member (7) is arranged between the clamping assembly (3) and the top support plate (511), one end of the connecting elastic member (7) is fixedly connected to the clamping assembly (3), and the other end is fixedly connected to the top support plate (511), and the connecting elastic member (7) has a tendency to pull the clamping assembly (3) and the top support plate (511) to move towards each other.

2. The pneumatic grinder chuck according to claim 1, characterized in that: The top support assembly (5) further includes a moving column (51). The moving column (51) is slidably connected to the disk body (1). The upper part of the moving column (51) is fixedly connected to a top support plate (511). A pressure-bearing disk (512) is arranged at the lower part of the moving column (51). The pressure-bearing disk (512) is fixedly connected to the moving column (51). A guide tube (12) is arranged on the disk body (1) facing the air chamber (11). The pressure-bearing disk (512) is slidably connected to the side wall of the guide tube (12). A sealing ring (6) is arranged on the pressure-bearing disk (512). One side of the sealing ring (6) abuts against the pressure-bearing disk (512), and the other side abuts against the inner wall of the guide tube (12).

3. The pneumatic grinder chuck according to claim 2, characterized in that: A reset elastic member (8) is arranged on the pressure-bearing disk (512). One end of the reset elastic member (8) is fixedly connected to the pressure-bearing disk (512), and the other end is fixedly connected to the inner wall of the disk body (1). The reset elastic member (8) has a tendency to push the pressure-bearing disk (512) to move away from the clamping assembly (3).

4. The pneumatic grinder chuck according to claim 1, characterized in that: The clamping assembly (3) includes a claw base (31) and a claw head (32). The claw base (31) is hinged to the clamping base (2). A transition block (314) is arranged on the claw base (31). A waist-shaped slot (321) is formed in the claw head (32). A bolt passes through the waist-shaped slot (321) and is threadedly connected to the claw base (31). The claw head (32) abuts against the bolt head.

5. The pneumatic grinding machine chuck according to claim 4, wherein: One end of the claw head (32) facing the ejector pin (21) is provided with a guide surface (322) and an abutting surface (323). The abutting surface (323) is arranged corresponding to the position of the ejector pin (21). The abutting surface (323) is used for abutting against the workpiece. The guide surface (322) is inclined from the side wall of the claw head (32) towards the abutting surface (323). After the workpiece is fed onto the guide surface (322), it is sent to the abutting surface (323) through the guide surface (322).

6. The pneumatic grinder chuck according to claim 4, characterized in that: An adjusting rod (312) is further arranged on the claw base (31). The adjusting rod (312) is threadedly connected to the claw base (31). After passing through the claw base (31), the adjusting rod (312) faces the claw head (32) and is used for abutting against the claw head (32). A fixing nut (313) is further arranged on the adjusting rod (312). The fixing nut (313) is threadedly connected to the adjusting rod (312) and is used for tightly abutting against the claw base (31).

7. The pneumatic grinder chuck according to claim 1, wherein: The ejector pin (21) is rotatably connected to the clamping base (2).

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