Hollow aerodynamic chuck and machining apparatus

Abstract

The utility model relates to the field of machining discloses a hollow aerodynamic chuck and machining equipment, including chuck body, drive assembly and conveying assembly, conveying assembly includes rotary gas ring and floating gas ring, rotary gas ring is set up in the outside of chuck body, and rotary gas ring has first medium conveying hole, and first medium conveying hole is linked together with first cavity and second cavity, floating gas ring has second medium conveying hole, and second medium conveying hole is linked together with first medium conveying hole, and second medium conveying hole can also be linked together with outside drive medium source. Rotary gas ring rotates along with chuck body, and rotates relative to floating gas ring, and floating gas ring is linked together with outside drive medium source, and the drive medium that outside drive medium source delivery passes through the second medium conveying hole of floating gas ring and the first medium conveying hole of rotary gas ring, and is conveyed to first cavity and second cavity, under the premise that not influencing workpiece to pass through chuck body and valve core, guarantee the smooth conveyance of drive medium.

Description

Technical Field

[0001] This utility model relates to the technical field of machining equipment and its peripheral supporting facilities, and in particular to a pneumatic chuck and machining equipment. Background Technology

[0002] In the machining of shaft-type workpieces, machining accuracy directly determines the assembly compatibility and reliability of the product. The workpiece clamping process is one of the core factors affecting machining accuracy. The stability and positioning accuracy of the clamping directly affect the cutting process, thus influencing the dimensional and geometric tolerances of the workpiece, such as roundness, cylindricity, and coaxiality. Among the clamping methods for shaft-type workpieces, chuck clamping is widely used due to its advantages such as convenient operation, wide clamping range, and strong adaptability. Whether it is the end face machining of small and medium-sized short shafts, the external turning of stepped shafts, or the one-end positioning and clamping of long shaft-type workpieces, the chuck can provide stable reference support for subsequent cutting processes by precisely controlling the clamping force and positioning accuracy of the jaws.

[0003] Currently, some pneumatic chucks on the market use a spindle-center power input design, requiring the placement of power transmission structures such as tie rods and air pipe connectors in the central area of ​​the chuck. This prevents the formation of a continuous channel in the middle of the chuck. When machining long shaft workpieces, this type of chuck is limited by its centrally enclosed structure, preventing part or most of the long shaft workpiece from passing through the chuck's interior. The chuck can only clamp one end of the workpiece for machining. For ultra-long shaft workpieces, the excessive overhang may lead to insufficient clamping stability, thus affecting the machining accuracy of the workpiece.

[0004] Therefore, how to change the current situation in which pneumatic chucks do not allow shaft-type workpieces to pass through, thus affecting the machining accuracy of the workpieces, has become an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this utility model is to provide a pneumatic chuck and machining equipment to solve the problems existing in the above-mentioned related technologies, so that shaft workpieces can pass through the pneumatic chuck, improve the workpiece clamping stability, and thus improve the machining accuracy of shaft workpieces.

[0006] To achieve the above objectives, this utility model provides the following solution: This utility model provides a pneumatic chuck, comprising: A chuck body, which can be connected to the spindle of a machining equipment; The chucks are arranged in multiple sets, and the chucks are evenly distributed circumferentially around the axis of the main shaft of the equipment. A drive assembly includes a valve core slidably connected to a chuck body, the chuck body driving the valve core to rotate; the chuck body is sleeved outside the valve core, and the two form a first cavity and a second cavity; by supplying a drive medium into the first cavity and the second cavity, the valve core can be driven to reciprocate; the valve core is driven by a jaw, and the reciprocating sliding of the valve core can drive the jaw to reciprocate along the radial direction of the main shaft of the equipment, so as to clamp and release the workpiece; both the chuck body and the valve core are hollow rotating structures, so that the workpiece can extend into the hollow part of the chuck body and the valve core; The conveying assembly includes a rotating air ring and a floating air ring. The rotating air ring is sleeved on the outside of the chuck body and has a first medium conveying hole that communicates with the first cavity and the second cavity. The floating air ring is rotatably sleeved on the outside of the rotating air ring, and a sealing element is provided between the two. The floating air ring has a second medium conveying hole that communicates with the first medium conveying hole and can also communicate with an external driving medium source.

[0007] Preferably, the inner wall of the rotating gas ring has a first annular groove, the axial section of the first annular groove is a U-shaped structure with the opening facing the axis, the first medium conveying hole is disposed at the bottom of the first annular groove, and the first annular groove and the outer wall of the chuck body form a medium conveying channel. The chuck body has a medium passage hole, which is connected to the medium delivery channel.

[0008] Preferably, there are two sets of the first annular grooves, and the first annular grooves and the outer wall of the chuck body form two sets of media conveying channels, one set of media conveying channels is connected to the first cavity, and the other set of media conveying channels is connected to the second cavity.

[0009] Preferably, each of the first annular grooves is provided with a plurality of first medium conveying holes, which are evenly distributed circumferentially around the axis of the rotating gas ring.

[0010] Preferably, the inner wall of the floating air ring has a second annular groove, the axial section of the second annular groove is a U-shaped structure with the opening facing the axis, the second medium conveying hole is disposed at the bottom of the second annular groove, the axial position of the second annular groove is adapted to the axial position of the first annular groove, and the second annular groove corresponds one-to-one with the first annular groove, so that the driving medium can smoothly enter the medium conveying channel. The second medium delivery hole can be connected to the delivery connector and connected to the external driving medium source via the delivery pipeline.

[0011] Preferably, the sealing element is sleeved on the rotating air ring, and there are multiple sets of the sealing elements, which are arranged along the axial direction of the rotating air ring.

[0012] Preferably, the drive assembly further includes a drive block connected to the valve core and slidably connected to the jaw. The sliding connection surface between the drive block and the jaw is an inclined surface, so as to drive the jaw to reciprocate along the radial direction of the main shaft of the equipment. The drive block and the jaw correspond one-to-one.

[0013] Preferably, the chuck includes a female chuck and a female chuck, the female chuck is slidably connected to the drive block, the female chuck is connected to the female chuck, and a positioning pin is provided between the female chuck and the female chuck.

[0014] This utility model provides a machining equipment, including a machine spindle and the aforementioned pneumatic chuck, wherein the chuck body is connected to the machine spindle via a spindle connecting flange.

[0015] Preferably, a bearing is provided between the main shaft connecting flange and the floating air ring; The bearing is sleeved on the outside of the main shaft connecting flange; it also includes a floating bearing housing, which is connected to the floating air ring to support the bearing.

[0016] This utility model achieves the following technical effects compared to related technologies: The pneumatic chuck of this utility model includes a chuck body, a drive assembly, and a conveying assembly. The chuck body can be connected to the spindle of a machining equipment. Multiple sets of jaws are evenly distributed circumferentially around the axis of the spindle. The drive assembly includes a valve core, which is slidably connected to the chuck body, and the chuck body can drive the valve core to rotate. The chuck body is sleeved around the valve core, and the two form a first cavity and a second cavity. By conveying a driving medium into the first and second cavities, the valve core can be driven to reciprocate. The valve core is connected to the jaws via a transmission mechanism, and the reciprocating sliding of the valve core can drive the jaws along the equipment... The spindle reciprocates radially to clamp and release the workpiece. Both the chuck body and the valve core are hollow rotating structures, allowing the workpiece to extend into their hollow portions. The conveying assembly includes a rotating air ring and a floating air ring. The rotating air ring is fitted around the outside of the chuck body and has a first medium conveying hole that communicates with a first cavity and a second cavity. The floating air ring is rotatably fitted around the rotating air ring, with a sealing element between them. The floating air ring has a second medium conveying hole that communicates with the first medium conveying hole and can also communicate with an external driving medium source.

[0017] The pneumatic chuck of this invention utilizes a drive assembly to deliver a drive medium to the first and second cavities to drive the valve core to slide back and forth. The valve core can drive the gripper to move back and forth, thereby clamping and releasing the workpiece. The chuck body rotates along with the spindle of the machining equipment, which in turn drives the valve core and the gripper to rotate, so as to realize the machining of shaft-type workpieces. The chuck body and valve core of this invention are both hollow rotating structures, allowing the workpiece to extend into the hollow parts of the chuck body and valve core, ensuring the stability of the mounting of shaft-type workpieces and thus improving the machining accuracy of the workpieces. The drive assembly of this invention includes a rotating air ring and a floating air ring. The rotating air ring rotates with the chuck body and relative to the floating air ring. The floating air ring is connected to an external drive medium source. The drive medium supplied by the external drive medium source is delivered to the first cavity and the second cavity through the second medium delivery hole of the floating air ring and the first medium delivery hole of the rotating air ring. Without affecting the workpiece passing through the chuck body and valve core, the smooth delivery of the drive medium is ensured, thereby ensuring the reliability of the mounting of shaft-type workpieces and improving the flexibility and adaptability of the pneumatic chuck. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or related technologies, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is an isometric schematic diagram of the pneumatic chuck disclosed in the embodiments of this utility model; Figure 2 This is a front view schematic diagram of the pneumatic chuck disclosed in the embodiments of this utility model; Figure 3 This is a side view of the pneumatic chuck disclosed in the embodiments of this utility model; Figure 4 This is an axial cross-sectional view of the pneumatic chuck disclosed in the embodiments of this utility model; Figure 5 This is an axial cross-sectional view of the pneumatic chuck disclosed in the embodiments of this utility model from other angles; Figure 6 This is a schematic diagram of the rotating air ring of the pneumatic chuck disclosed in the embodiment of this utility model. Figure 7 This is a cross-sectional schematic diagram of the rotating air ring of the pneumatic chuck disclosed in the embodiments of this utility model; Figure 8 for Figure 7 Enlarged view of point H in the middle; Figure 9 This is a schematic diagram of the chuck body of the pneumatic chuck disclosed in the embodiments of this utility model; Figure 10 This is a cross-sectional structural diagram of the chuck body of the pneumatic chuck disclosed in the embodiment of this utility model.

[0020] In the diagram: 1. Chuck body; 101. Medium passage hole; 2. Chuck jaws; 201. Female jaw; 202. Female jaw; 203. Positioning pin; 3. Valve core; 4. Rotating air ring; 401. First medium delivery hole; 402. First annular groove; 5. Floating air ring; 501. Second medium delivery hole; 6. First cavity; 7. Second cavity; 8. Sealing element; 9. Drive block; 10. Main shaft connecting flange; 11. Bearing; 12. Floating bearing seat; 13. Delivery connector. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] The purpose of this utility model is to provide a pneumatic chuck and machining equipment to solve the problems existing in the above-mentioned related technologies, so that shaft workpieces can pass through the pneumatic chuck, improve the workpiece clamping stability, and thus improve the machining accuracy of shaft workpieces.

[0023] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1 This embodiment provides a pneumatic chuck; please refer to [reference needed]. Figures 1-10 The system includes a chuck body 1, a drive assembly, and a conveying assembly. The chuck body 1 is connected to the spindle of the machining equipment. Multiple sets of jaws 2 are evenly distributed circumferentially around the axis of the spindle. The drive assembly includes a valve core 3, which is slidably connected to the chuck body 1, allowing the chuck body 1 to rotate the valve core 3. The chuck body 1 is fitted over the valve core 3, forming a first cavity 6 and a second cavity 7. By supplying a driving medium into the first cavity 6 and the second cavity 7, the valve core 3 can reciprocate. The valve core 3 is connected to the jaws 2 via a transmission mechanism. The reciprocating sliding of the valve core 3 drives the jaws 2 to reciprocate along the radial direction of the spindle, thereby clamping and releasing the workpiece. Both the chuck body 1 and the valve core 3 are hollow rotating structures, allowing the workpiece to be inserted into the hollow parts of the chuck body 1 and the valve core 3. The conveying assembly includes a rotating air ring 4 and a floating air ring 5. The rotating air ring 4 is sleeved on the outside of the chuck body 1 and has a first medium conveying hole 401, which is connected to the first cavity 6 and the second cavity 7. The floating air ring 5 is rotatably sleeved on the outside of the rotating air ring 4 and a sealing element 8 is provided between them. The floating air ring 5 has a second medium conveying hole 501, which is connected to the first medium conveying hole 401 and can also be connected to an external driving medium source.

[0025] The pneumatic chuck of this invention uses a drive assembly to deliver a drive medium to the first cavity 6 and the second cavity 7 to drive the valve core 3 to slide back and forth. The valve core 3 can drive the gripper to move back and forth, thereby clamping and releasing the workpiece. The chuck body 1 rotates along with the spindle of the machining equipment, which in turn drives the valve core 3 and the gripper 2 to rotate, so as to realize the machining of shaft workpieces. The chuck body 1 and valve core 3 of this invention are both hollow rotating structures, allowing the workpiece to extend into the hollow parts of the chuck body 1 and valve core 3, ensuring the stability of the mounting of shaft workpieces and thus improving the machining accuracy of the workpieces. The drive assembly of this invention includes a rotating air ring 4 and a floating air ring 5. The rotating air ring 4 rotates with the chuck body 1 and rotates relative to the floating air ring 5. The floating air ring 5 is connected to an external drive medium source. The drive medium supplied by the external drive medium source is delivered to the first cavity 6 and the second cavity 7 through the second medium delivery hole 501 of the floating air ring 5 and the first medium delivery hole 401 of the rotating air ring 4. Under the premise of not affecting the workpiece passing through the chuck body 1 and valve core 3, the smooth delivery of the drive medium is ensured, thereby ensuring the reliability of the mounting of shaft workpieces and improving the flexibility and adaptability of the pneumatic chuck.

[0026] It should be noted that in this specific embodiment, gas is selected as the driving medium. In practical applications, other types of media can also be selected as the driving medium according to the actual working conditions, so as to improve the flexibility and adaptability of the device while ensuring the working reliability of the pneumatic chuck.

[0027] The rotating gas ring 4 has a first annular groove 402 on its inner wall. The axial section of the first annular groove 402 is a U-shaped structure with the opening facing the axis. The first medium conveying hole 401 is located at the bottom of the first annular groove 402. The first annular groove 402 and the outer wall of the chuck body 1 form a medium conveying channel. The chuck body 1 has a medium through hole 101, which is connected to the medium conveying channel.

[0028] The driving medium supplied by the external driving medium source enters the medium conveying channel through the first medium conveying hole 401, and then enters the first cavity 6 and the second cavity 7 through the medium through hole 101 to achieve the purpose of driving the valve core 3 to reciprocate. A first annular groove 402 is provided on the inner wall of the rotating air ring 4. The first annular groove 402 and the outer wall of the chuck body 1 form a medium conveying channel. The driving medium first enters the medium conveying channel, and then enters the first cavity 6 and the second cavity 7. The medium conveying channel is an annular cavity. The medium conveying channel helps to improve the uniformity of air intake in the first cavity 6 and the second cavity 7, thereby improving the uniformity of force on the valve core 3. While ensuring the reliability of the valve core 3's movement, it also improves the stability of the valve core 3's movement, and further ensures the clamping stability of shaft-type workpieces.

[0029] In this specific embodiment, there are two sets of first annular grooves 402. The first annular grooves 402 and the outer wall of the chuck body 1 form two sets of media conveying channels. One set of media conveying channels is connected to the first cavity 6, and the other set of media conveying channels is connected to the second cavity 7. By setting two sets of media conveying channels, corresponding to the first cavity 6 and the second cavity 7 respectively, the normal conveying of the driving medium is ensured, and the working reliability of the conveying assembly is improved.

[0030] Specifically, each of the first annular grooves 402 is provided with a plurality of first medium conveying holes 401. The first medium conveying holes 401 are evenly distributed around the axis of the rotating air ring 4, which helps to improve the uniformity of the driving medium entering the medium conveying channel.

[0031] Correspondingly, the inner wall of the floating air ring 5 has a second annular groove. The axial cross-section of the second annular groove is a U-shaped structure with the opening facing the axis. The second medium conveying hole 501 is located at the bottom of the second annular groove. The driving medium conveyed by the external driving medium source enters the second annular groove through the second medium conveying hole 501. The axial position of the second annular groove matches the axial position of the first annular groove 402, and the second annular groove corresponds one-to-one with the first annular groove 402, so that the driving medium can smoothly enter the medium conveying channel. The conveying assembly of this utility model has a second annular groove on the inner wall of the floating air ring 5. During the rotation of the rotating air ring 4 relative to the floating air ring 5, the driving medium can be smoothly conveyed, further ensuring the uniformity of medium conveying.

[0032] In order to enable the conveying assembly to be easily connected to an external driving medium source, the second medium conveying hole 501 can be connected to the conveying connector 13. After the second medium conveying hole 501 is equipped with the conveying connector 13, the conveying connector 13 is connected to the external driving medium source through the conveying pipeline, ensuring the smooth conveying of the driving medium and improving the convenience of medium conveying. In practical applications, a control valve is installed on the conveying pipeline to facilitate the control of the conveying status of the driving medium.

[0033] It should also be noted that the sealing element 8 is sleeved on the rotating air ring 4. There are multiple sets of sealing elements 8. The sealing elements 8 are arranged along the axial direction of the rotating air ring 4. The sealing elements 8 can seal the gap between the rotating air ring 4 and the floating air ring 5 to prevent leakage of the driving medium. Correspondingly, a sealing ring is also provided between the valve core 3 and the chuck body 1 to ensure the sealing of the first cavity 6 and the second cavity 7 and improve the working reliability of the device.

[0034] More specifically, the drive assembly also includes a drive block 9, which is connected to the valve core 3 and slidably connected to the jaw 2. The sliding connection surface between the drive block 9 and the jaw 2 is an inclined surface, which drives the jaw 2 to reciprocate along the radial direction of the main shaft of the equipment. The drive block 9 and the jaw 2 correspond one-to-one. The sliding connection surface between the drive block 9 and the jaw 2 is an inclined surface. The valve core 3 drives the drive block 9 to reciprocate along the axial direction of the chuck body 1. The sliding connection surface between the drive block 9 and the jaw 2 pushes the jaw 2 to reciprocate along the radial direction of the chuck body 1 to clamp and release shaft-type workpieces.

[0035] In this specific embodiment, the jaw 2 adopts a split structure, which includes a female jaw 201 and a female jaw 202. The female jaw 201 is slidably connected to the drive block 9, and the drive block 9 drives the female jaw 201 to move. The female jaw 202 is connected to the female jaw 201 by screws, thereby driving the female jaw 202 to move, so as to realize the clamping of the workpiece. Furthermore, a positioning pin 203 is provided between the female jaw 201 and the female jaw 202 to ensure the assembly accuracy of the jaw.

[0036] This invention relates to a pneumatic chuck, which allows shaft-type workpieces to extend into the hollow portion of the chuck body 1 and valve core 3. This improves the stability of shaft-type workpiece clamping, enhances workpiece machining accuracy, reduces the difficulty of clamping and machining long shaft-type workpieces, and lowers equipment investment costs. When the shaft-type workpiece being machined is long and only a portion of its length is the machining area, the unmachined portion of the workpiece can be extended into the chuck body 1. Compared to the existing clamping method of clamping shaft-type workpieces at both axial ends, using this invention's pneumatic chuck helps reduce the space occupied by the machining equipment and improves the adaptability of the machining equipment.

[0037] Example 2 This embodiment provides a machining equipment, including a machine spindle and a pneumatic chuck as described in Embodiment 1. The chuck body 1 is connected to the machine spindle via a spindle connecting flange 10. The machine spindle drives the chuck body 1 to rotate via the spindle connecting flange 10.

[0038] It should also be noted that a bearing 11 is provided between the spindle connecting flange 10 and the floating air ring 5; the bearing 11 is sleeved on the outside of the spindle connecting flange 10; it also includes a floating bearing seat 12, which is connected to the floating air ring 5 to support the bearing 11.

[0039] This invention provides a bearing 11 between the main shaft connecting flange 10 and the floating air ring 5, which can further ensure the smooth relative rotation of the chuck body 1 and the rotating air ring 4 and the floating air ring 5, and extend the service life of the device, especially under the condition that the chuck body 1 rotates at a high speed.

[0040] In practical applications, to prevent the floating air ring 5 from rotating with the rotating air ring 4 and the chuck body 1, the floating air ring 5 can be connected to other structures of the machining equipment. For example, an anti-rotation screw can be installed on the frame of the machining equipment, with one end of the anti-rotation screw extending into the anti-rotation hole of the floating air ring 5, effectively preventing the floating air ring 5 from rotating out of position and ensuring the normal delivery of the driving medium.

[0041] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A pneumatic chuck, characterized in that, include: A chuck body, which can be connected to the spindle of a machining equipment; The chucks are arranged in multiple sets, and the chucks are evenly distributed circumferentially around the axis of the main shaft of the equipment. A drive assembly, the drive assembly including a valve core slidably connected to the chuck body, the chuck body being capable of driving the valve core to rotate; The chuck body is sleeved on the outside of the valve core, and the two form a first cavity and a second cavity. By supplying a driving medium into the first cavity and the second cavity, the valve core can be driven to reciprocate. The valve core is connected to the jaws for transmission. The reciprocating sliding of the valve core can drive the jaws to reciprocate along the radial direction of the main shaft of the equipment, so as to clamp and release the workpiece. Both the chuck body and the valve core are hollow rotating structures, so that the workpiece can be inserted into the hollow part of the chuck body and the valve core. The conveying assembly includes a rotating air ring and a floating air ring. The rotating air ring is sleeved on the outside of the chuck body and has a first medium conveying hole that communicates with the first cavity and the second cavity. The floating air ring is rotatably sleeved on the outside of the rotating air ring, and a sealing element is provided between the two. The floating air ring has a second medium conveying hole that communicates with the first medium conveying hole and can also communicate with an external driving medium source.

2. The pneumatic chuck according to claim 1, characterized in that: The inner wall of the rotating gas ring has a first annular groove. The axial cross-section of the first annular groove is a U-shaped structure with the opening facing the axis. The first medium conveying hole is located at the bottom of the first annular groove. The first annular groove and the outer wall of the chuck body form a medium conveying channel. The chuck body has a medium passage hole, which is connected to the medium delivery channel.

3. The pneumatic chuck according to claim 2, characterized in that: The number of the first annular grooves is two sets. The first annular grooves and the outer wall of the chuck body form two sets of media conveying channels. One set of media conveying channels is connected to the first cavity, and the other set of media conveying channels is connected to the second cavity.

4. The pneumatic chuck according to claim 3, characterized in that: Each of the first annular grooves is provided with a plurality of first medium conveying holes, which are evenly distributed circumferentially around the axis of the rotating gas ring.

5. The pneumatic chuck according to claim 2, characterized in that: The inner wall of the floating air ring has a second annular groove. The axial cross section of the second annular groove is a U-shaped structure with the opening facing the axis. The second medium conveying hole is located at the bottom of the second annular groove. The axial position of the second annular groove is adapted to the axial position of the first annular groove. The second annular groove corresponds one-to-one with the first annular groove, so that the driving medium can smoothly enter the medium conveying channel. The second medium delivery hole can be connected to the delivery connector and connected to the external driving medium source via the delivery pipeline.

6. The pneumatic chuck according to claim 1, characterized in that: The sealing element is sleeved on the rotating air ring, and there are multiple sets of the sealing elements, which are arranged along the axial direction of the rotating air ring.

7. The pneumatic chuck according to claim 1, characterized in that: The drive assembly further includes a drive block, which is connected to the valve core and slidably connected to the jaw. The sliding connection surface between the drive block and the jaw is an inclined surface, so as to drive the jaw to reciprocate along the radial direction of the main shaft of the equipment. The drive block and the jaw correspond one-to-one.

8. The pneumatic chuck according to claim 7, characterized in that: The chuck includes a female chuck and a female chuck. The female chuck is slidably connected to the drive block, and the female chuck is connected to the female chuck. A positioning pin is provided between the female chuck and the female chuck.

9. A machining equipment, comprising a spindle, characterized in that: It also includes the pneumatic chuck according to any one of claims 1-8, wherein the chuck body is connected to the main shaft of the equipment via a main shaft connecting flange.

10. The machining equipment according to claim 9, characterized in that: A bearing is provided between the main shaft connecting flange and the floating air ring; The bearing is sleeved on the outside of the main shaft connecting flange; it also includes a floating bearing housing, which is connected to the floating air ring to support the bearing.

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