Inner support chuck assembly and inner support clamp

Abstract

The inner supporting chuck assembly comprises an inner supporting expansion sleeve, an inner supporting pull rod and a plurality of chuck parts, the inner supporting pull rod can be movably inserted into the inner supporting expansion sleeve in the axial direction of the inner supporting pull rod, the outer side wall of the inner supporting pull rod is in taper fit with the inner side wall of the inner supporting expansion sleeve, and each chuck part is used for being arranged on the inner supporting expansion sleeve in a sleeving mode. The multiple clamping head parts are arranged in the radial thickness direction of the inner supporting expansion sleeve in a different mode, one of the multiple clamping head parts is arranged on the outer side wall of the inner supporting expansion sleeve in a sleeving mode, and the inner supporting pull rod can move relative to the inner supporting expansion sleeve and open the inner supporting expansion sleeve and the clamping head parts so that the clamping head parts can abut against an annular workpiece used for sleeving the clamping head parts. Due to the fact that the multiple chuck parts with different thicknesses and the outer sleeve type structure are arranged, the inner supporting chuck assembly can meet the clamping requirements of annular workpieces of different shapes, sizes and materials, and the universality and flexibility of the inner supporting chuck assembly are improved through the adaptability.

Description

Technical Field

[0001] This application relates to the technical field of workpiece processing, and particularly relates to an internal support chuck assembly and an internal support fixture. Background Art

[0002] When machining a ring-shaped workpiece automatically on a machine tool, it is usually necessary to use the chuck assembly of an internal support fixture to abut against the inner side wall of the workpiece to achieve clamping and fixing of the workpiece. In the related art, the chuck assembly of an internal support fixture usually can only match a ring-shaped workpiece with a single fixed specification size. If it is necessary to adapt to a ring-shaped workpiece of another size, the entire chuck assembly must be replaced. Thus, the versatility of the chuck assembly is poor. Utility Model Content

[0003] The embodiments of this application provide an internal support chuck assembly and an internal support fixture, which improve the versatility of the internal support chuck assembly.

[0004] To achieve the above object, according to the first aspect of this application, there is provided an internal support fixture, including:

[0005] An internal support expanding sleeve;

[0006] An internal support pull rod, which can be movably inserted into the internal support expanding sleeve along its axial direction, and the outer side wall of the internal support pull rod is in taper fit with the inner side wall of the internal support expanding sleeve;

[0007] A plurality of chuck parts, each of the chuck parts is used to cover the outside of the internal support expanding sleeve, the thicknesses of the plurality of chuck parts along the radial direction of the internal support expanding sleeve are set differently, and one of the plurality of chuck parts is sleeved on the outer side wall of the internal support expanding sleeve;

[0008] Wherein, the internal support pull rod can move relative to the internal support expanding sleeve, and expand the internal support expanding sleeve and the chuck parts, so that the chuck parts are abutted against a ring-shaped workpiece for covering the chuck parts.

[0009] Optionally, the internal support expanding sleeve includes:

[0010] A plurality of internal support main bodies, the plurality of internal support main bodies are arranged at intervals along the circumferential direction of the internal support pull rod, and one side of the plurality of internal support main bodies facing the internal support pull rod is adapted to be in taper fit with the outer side wall of the internal support pull rod;

[0011] An elastic connecting piece, which is elastically connected to each internal support main body.

[0012] Optionally, each of the chuck parts includes a plurality of chuck conversion blocks, the plurality of chuck conversion blocks are used to surround the circumferential side of the internal support expanding sleeve, and each chuck conversion block is detachably connected to at least one of the plurality of internal support main bodies.

[0013] Optionally, each of the inner support bodies is arranged to extend along the circumference of the inner support rod; and / or,

[0014] Each of the chuck changing blocks is used to extend along the circumference of the inner expansion sleeve.

[0015] Optionally, a plurality of the chuck shape-changing blocks are arranged in one-to-one correspondence with a plurality of the inner support bodies, and each of the chuck shape-changing blocks is detachably connected to the corresponding inner support body.

[0016] Optionally, an annular support seat is further included, which is externally mounted on the inner support rod and extends radially along the inner support rod. The annular support seat is elastically connected to one end of the inner support sleeve, and is used to be installed on the machine base.

[0017] Optionally, the inner support body has a first end face away from the annular support seat, and the chuck changing block includes a fitting block and a limit platform connected to the fitting block, the fitting block is arranged opposite to the outer side wall of the inner support body, and the limit platform is arranged on the side of the fitting block facing the inner support body, and the limit platform is used to abut against the first end face.

[0018] Optionally, the outer side of the end of the fitting block facing away from the annular support seat is stepped to form a step surface facing away from the annular support seat, and the step surface is used to abut against the side of the annular workpiece facing the annular support seat.

[0019] Optionally, the fitting block further forms a limiting surface disposed away from the inner supporting body, the limiting surface being connected to the step surface, and the limiting surface being used to abut against the inner side wall of the annular workpiece facing the inner supporting body.

[0020] Optionally, a gap is formed between two adjacent inner support bodies and annular support seats;

[0021] The elastic connecting member includes a plurality of elastic members, each of the gaps is equipped with an elastic member, and the elastic member is used to seal the gap.

[0022] Optionally, a first annular groove is provided on the inner side wall of the annular support seat facing the inner support rod, and the inner support chuck assembly further comprises a first sealing ring, which is installed in the first annular groove and is used to seal the gap between the annular support seat and the inner support rod; and / or,

[0023] The annular support seat is provided with a second annular groove on one side facing the machine base. The inner support chuck assembly also includes a second sealing ring installed in the second annular groove. The second sealing ring is used to seal the gap between the annular support seat and the machine base.

[0024] According to a second aspect of the present application, there is provided an internal support fixture, comprising:

[0025] base;

[0026] The inner support chuck assembly as described above is mounted on the machine base;

[0027] The driving component is arranged corresponding to the inner supporting chuck component and is installed on the machine base. The driving component is used to drive the inner supporting pull rod to move.

[0028] Optionally, the base includes:

[0029] A bearing portion, wherein a mounting hole is provided through the bearing portion along its thickness direction, and the inner support sleeve is mounted on one side of the bearing portion along its thickness direction, so that the through hole of the inner support sleeve is connected to the mounting hole;

[0030] At least two supporting parts are arranged on the other side of the bearing part along the thickness direction and are connected to the bearing part. At least two supporting parts are arranged at intervals so that at least two supporting parts and the bearing part jointly form an installation space connected to the installation hole. The installation space is for the installation of the driving component, and the driving component is suitable for being driven and connected to the inner support rod through the installation hole.

[0031] Optionally, the driving assembly includes a pneumatic cylinder, a cylinder body of the cylinder is connected to the bearing portion, and a piston rod of the cylinder is drivingly connected to the inner support rod.

[0032] Optionally, a third annular groove is provided on a side of the cylinder body of the cylinder facing the bearing portion;

[0033] The inner support fixture further includes a third sealing ring installed in the third annular groove to seal the gap between the cylinder body of the cylinder and the bearing portion.

[0034] Optionally, one end of the inner support rod is threadedly connected to the free end of the piston rod.

[0035] Optionally, the free end of the piston rod is located in the mounting hole;

[0036] The bearing portion is provided with a through hole in the horizontal direction, the through hole is communicated with the mounting hole, and the through hole is used for the anti-rotation portion to extend therein, so as to limit the rotation of the piston rod relative to the bearing portion through the anti-rotation portion.

[0037] Optionally, a plurality of the inner support chuck assemblies are provided, and the plurality of chuck assemblies are arranged at intervals on the machine base.

[0038] Optionally, a plurality of the driving assemblies are provided, and the plurality of the driving assemblies are provided in one-to-one correspondence with the plurality of the inner support chuck assemblies, and each of the driving assemblies is used to drive the inner support rod of the corresponding inner support chuck assembly to move.

[0039] In the inner support chuck assembly of the embodiment of the present application, the outer wall of the inner support rod and the inner wall of the inner support sleeve are matched with a taper. When the inner support rod moves axially, the inner support sleeve is forced to expand or contract radially due to the presence of the taper. The thickness of the multiple chuck parts is different along the radial direction of the inner support sleeve. This design allows the multiple chuck parts to better adapt to the inner walls of annular workpieces of different shapes and sizes. By selecting a chuck part that matches the annular workpiece to be clamped and sleeved on the outer wall of the inner support sleeve, when the inner support rod moves relative to the inner support sleeve, the inner support sleeve and the chuck part will be stretched open, so that the chuck part abuts against the annular workpiece, thereby ensuring the rapidity and effectiveness of the self-centering clamping and limiting of the annular workpiece. The multiple chuck parts with different thicknesses and the sleeve-type structure enable the inner support chuck assembly to adapt to the clamping requirements of annular workpieces of different shapes, sizes and materials. This adaptability improves the versatility and flexibility of the inner support chuck assembly.

[0040] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0042] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings, wherein the same drawing numbers represent the same parts in the following description.

[0043] Figure 1 is an exploded schematic diagram of an internal support clamp assembly provided in an exemplary embodiment of the present disclosure;

[0044] Figure 2 yes Figure 1 The structural diagram of the inner support sleeve and the annular support seat is shown;

[0045] Figure 3 yes Figure 1 The structural diagram of the chuck changing block shown;

[0046] Figure 4 is a schematic structural diagram of an inner support fixture clamping an annular workpiece provided in an exemplary embodiment of the present disclosure;

[0047] Figure 5 is Figure 4 a partial structural schematic diagram of the internal support fixture shown;

[0048] Figure 6 is Figure 5 a cross-sectional schematic diagram of the internal support fixture shown;

[0049] Figure 7 is Figure 6 a partially enlarged schematic diagram at the position A shown;

[0050] Figure 8 a structural schematic diagram of the bearing part provided in an exemplary embodiment of the present disclosure.

[0051] Description of reference numerals:

[0052] 10. Internal support chuck assembly;

[0053] 1. Internal support expanding sleeve, 11. Internal support main body, 111. First end face, 12. Elastic connecting piece, 121. Elastic piece, 2. Internal support pull rod, 3. Chuck part, 31. Chuck conversion block, 311. Fitting block, 3111. Step surface, 3112. Limiting surface, 312. Limiting platform, 313. Countersunk hole, 4. Ring support seat, 41. First annular groove, 42. Second annular groove, 51. First sealing ring, 52. Second sealing ring;

[0054] 20. Machine base, 201. Bearing part, 2011. Mounting hole, 2012. Passing hole, 2013. Support column, 202. Support part, 203. Installation space, 204. Housing;

[0055] 30. Driving assembly, 301. Cylinder, 3011. Cylinder block, 30111. Third annular groove, 3012. Piston rod;

[0056] 40. Third sealing ring, 50. Handle, 60. Silicone protection sheet, 70. Cover plate, 80. Manual valve; 200. Ring-shaped workpiece. Detailed implementation manners

[0057] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0058] The present application provides an internal support chuck assembly. Please refer to Figures 1 to 2 , Figure 1 an exploded schematic diagram of the internal support chuck assembly provided in an exemplary embodiment of the present disclosure;Figure 2 is Figure 1 a schematic structural view of the internal support expansion sleeve and the annular support seat shown; Figure 3 is Figure 1 a schematic structural view of the collet conversion block shown.

[0059] The internal support collet assembly 10 includes an internal support expansion sleeve 1, an internal support pull rod 2, and a plurality of collet parts 3.

[0060] It should be noted that the internal support expansion sleeve 1 has a certain elastic annular structure, so that the internal support expansion sleeve 1 can be deformed by the internal support pull rod 2.

[0061] The internal support pull rod 2 can be axially movably inserted into the internal support expansion sleeve 1, and the outer side wall of the internal support pull rod 2 is in taper fit with the inner side wall of the internal support expansion sleeve 1.

[0062] It should be noted that taper fit means that two parts have the same taper on the mating surface, and the mating method of radial expansion or contraction is achieved through axial movement. In the embodiment of the present application, the outer side wall of the internal support pull rod 2 and the inner side wall of the internal support expansion sleeve 1 both have corresponding tapers, and the two can form a tight conical surface contact when mating. When the internal support pull rod 2 is subjected to an axial force, due to the existence of the taper, this axial force will be converted into a radial expansion force of the internal support expansion sleeve 1.

[0063] Each collet part 3 is used to sleeve the internal support expansion sleeve 1, so that each collet part 3 can be installed in cooperation with the internal support expansion sleeve 1, and each collet part 3 can expand or contract correspondingly with the radial change of the internal support expansion sleeve 1.

[0064] The thicknesses of the plurality of collet parts 3 along the radial direction of the internal support expansion sleeve 1 are set differently. One of the plurality of collet parts 3 is sleeved on the outer side wall of the internal support expansion sleeve 1. Thus, due to the different thicknesses of the plurality of collet parts 3, they can adapt to the inner walls of annular workpieces 200 with different shapes and sizes. When one of the plurality of collet parts 3 is sleeved on the outer side wall of the internal support expansion sleeve 1, the tightness and stability of the clamping of the annular workpiece 200 can be ensured. When clamping the annular workpiece 200, by adjusting the thickness of the collet part 3, the corresponding collet part 3 can be precisely matched with and clamped to the inner wall of the annular workpiece 200.

[0065] In the inner support chuck assembly 10 of the embodiment of the present application, the outer wall of the inner support rod 2 and the inner wall of the inner support sleeve 1 are matched with a taper. When the inner support rod 2 moves axially, the inner support sleeve 1 is forced to expand or contract radially due to the presence of the taper. The thicknesses of the multiple chuck parts 3 are different along the radial direction of the inner support sleeve 1. This design allows the multiple chuck parts 3 to better adapt to the inner walls of annular workpieces 200 of different shapes and sizes. By selecting a chuck part 3 that matches the annular workpiece 200 to be clamped and sleeved on the outer wall of the inner support sleeve 1, when the inner support rod 2 moves relative to the inner support sleeve 1, the inner support sleeve 1 and the chuck part 3 will be stretched open, so that the chuck part 3 abuts against the annular workpiece 200, thereby ensuring the rapidity and effectiveness of the self-centering clamping and limiting of the annular workpiece 200. The multiple chuck parts 3 with different thicknesses and the sleeve-type structure enable the internal support chuck assembly 10 to adapt to the clamping requirements of annular workpieces 200 of different shapes, sizes and materials. This adaptability improves the versatility and flexibility of the internal support chuck assembly 10.

[0066] It should be noted that the repeatability of the internal support chuck assembly 10 in the embodiment of the present application is less than ±0.01 mm, and the unilateral expansion stroke is 0.4 mm. Of course, in other embodiments, the repeatability of the internal support chuck assembly 10 and the unilateral expansion stroke can be set as needed, and this application does not limit this.

[0067] Reference Figure 1 and Figure 2 In some embodiments, the internal support sleeve 1 includes a plurality of internal support bodies 11 and an elastic connector 12. The plurality of internal support bodies 11 are arranged at intervals along the circumference of the internal support rod 2. The side of the plurality of internal support bodies 11 facing the internal support rod 2 is adapted to cooperate with the tapered outer wall of the internal support rod 2. The elastic connector 12 is elastically connected to each internal support body 11. In this way, when the internal support rod 2 is subjected to tension, the plurality of internal support bodies 11 can be driven by the internal support rod 2 to move in a direction away from each other, thereby achieving radial expansion of the internal support sleeve 1. Since the plurality of internal support bodies 11 are arranged at intervals, each internal support body 11 can be independently adjusted. This design enables the chuck 3 connected to the internal support sleeve 1 to better clamp annular workpieces 200 of different shapes and sizes. The elastic connector 12 is elastically connected to each internal support body 11, and can provide a certain elastic buffer during the tightening process of the internal support sleeve 1, reducing stress concentration and damage caused by rigid contact. The elastic connection can also increase the overall stability of the inner support sleeve 1 and prevent deformation or loosening caused by uneven force during the tightening process. In addition, the design of multiple inner support bodies 11 and elastic connectors 12 makes the inner support sleeve 1 more flexible and convenient during installation and removal.

[0068] It should be noted that, in one embodiment, the material of the inner support body 11 includes 65Mn spring steel, and the surface of the spring steel is treated with special anti-rust treatment. Of course, in other embodiments, the material of the inner support body 11 may also include tungsten steel, titanium alloy, chromium molybdenum steel or tungsten steel alloy, etc. Specifically, the material of the inner support body 11 can be selected according to needs, and the present application does not limit this.

[0069] In addition, the shape of the elastic connecting member 12 is various. For example, in one embodiment, the elastic connecting member 12 can be arranged in a ring shape, and a plurality of inner support bodies 11 are connected to the elastic connecting member 12 arranged in a ring shape. In other embodiments, the elastic connecting member 12 may include a plurality of elastic members 121, and each elastic member 121 is located between two adjacent inner support bodies 11 and is elastically connected to the two adjacent inner support bodies 11.

[0070] It should be noted that there are various ways for the elastic connecting member 12 to be elastically connected to the inner support body 11. In one embodiment, the inner support body 11 can be adhesively fixed to the elastic connecting member 12. In one embodiment, high-performance vulcanized rubber is injected into a plurality of spaced inner support bodies 11 to form the elastic connecting member 12.

[0071] In addition, the material of the elastic connecting member 12 is various. For example, in one embodiment, the material of the elastic connecting member 12 may include rubber, silica gel or polyurethane elastomer, etc. Specifically, the material of the elastic connecting member 12 can be selected according to needs, and the present application does not limit this.

[0072] Refer to Figure 1 and Figure 3 In one embodiment, each clamping head portion 3 includes a plurality of clamping head conversion blocks 31. The plurality of clamping head conversion blocks 31 are used to surround the circumferential side of the inner support expanding sleeve 1. Each clamping head conversion block 31 is detachably connected to at least one of the plurality of inner support bodies 11. In this way, the same inner support body 11 can be selected to be matched with clamping head conversion blocks 31 of different thicknesses, so as to be applicable to a wider range of processing requirements. This design reduces the investment in the inner support chuck assembly 10 and improves the utilization rate of the inner support chuck assembly 10. Since the clamping head conversion block 31 is detachable, when a certain clamping head conversion block 31 is damaged or worn, this component can be replaced alone without replacing the entire chuck, which greatly reduces the maintenance cost and time. The plurality of clamping head conversion blocks 31 surround the circumferential side of the inner support expanding sleeve 1, which can provide a more uniform and stable clamping force, ensuring that the annular workpiece 200 will not affect the processing quality due to vibration or loosening during the processing. The detachable clamping head conversion block 31 makes the installation and disassembly process simpler and faster, reducing the operation difficulty and complexity.

[0073] It should be noted that after special heat treatment, the hardness range of the collet conversion block 31 reaches HRC58 - 62, which can improve the wear resistance of the collet, effectively extend the clamping life, and the service life is up to more than 80,000 times. In addition, the material of the collet conversion block 31 can include cemented carbide, nitinol alloy, ceramic material, etc. Specifically, the material of the collet conversion block 31 can be selected according to needs, and this application does not limit it.

[0074] In addition, there are various ways to achieve detachable connection between each collet conversion block 31 and at least one of the multiple inner support bodies 11. For example, in one embodiment, each collet conversion block 31 and at least one of the multiple inner support bodies 11 can be threadedly connected. In this way, the connection strength is high, and it is easy to install and disassemble. In one embodiment, each collet conversion block 31 and at least one of the multiple inner support bodies 11 can be snap - connected. In this way, the operation is simple, the connection speed is fast, and no additional tools are required. In other embodiments, each collet conversion block 31 and at least one of the multiple inner support bodies 11 can be pin - connected. Specifically, the way of detachable connection between each collet conversion block 31 and at least one of the multiple inner support bodies 11 can be selected according to needs, and this application does not limit it.

[0075] Refer to Figure 1 , the counterbore 313 is provided through the collet conversion block 31 along the inner support rod 2. The counterbore 313 is used for inserting a screw to threadedly connect the collet conversion block 31 and at least one of the multiple inner support bodies 11 through the screw. The end face of the counterbore 313 facing away from the inner support body 11 can be tightly attached to the plane of the screw head, so that the screw connection is stable and not easy to tilt and loosen. In addition, the function of the counterbore 313 is to bury the screw inside the collet conversion block 31, improving the aesthetics of the collet conversion block 31.

[0076] In some embodiments, each inner support body 11 extends circumferentially along the inner support rod 2. In this way, the inner support body 11 has a radian structure adapted to the inner support rod 2, which can ensure that when subjected to an external force, the force can be evenly distributed on the entire inner support body 11, avoiding the problem of local stress concentration of the inner support body 11, thereby improving the overall structural stability of the inner support body 11. The circumferentially extending inner support body 11 can provide a wider support surface, making the supporting force more dispersed and uniform, and enhancing the resistance of the inner support body 11 to external loads. This design method makes full use of the space between the inner support body 11 and the inner support rod 2, avoiding waste of space, and is conducive to the compact design of the inner support collet assembly 10.

[0077] In some embodiments, each collet change block 31 is arranged to extend circumferentially along the inner expanding sleeve 1, so that the collet change block 31 has a radian structure adapted to the inner expanding sleeve 1. This can ensure that when subjected to an external force, the force can be evenly distributed over the entire collet change block 31, avoiding the problem of local stress concentration on the collet change block 31, thereby improving the stability of the overall structure of the collet change block 31. The circumferentially extending collet change block 31 can provide a wider support surface, making the support force more dispersed and uniform, and enhancing the resistance of the collet change block 31 to external loads. This design method makes full use of the space between the collet change block 31 and the inner expanding sleeve 1, avoiding waste of space and facilitating the compact design of the inner expanding collet assembly 10.

[0078] In some embodiments, a plurality of collet change blocks 31 are arranged in one-to-one correspondence with a plurality of inner support bodies 11, and each collet change block 31 is detachably connected to the corresponding inner support body 11. Thus, since the collet change blocks 31 and the inner support bodies 11 are in one-to-one correspondence and detachably connected, the collet change blocks 31 can be conveniently and quickly replaced according to processing requirements, and the operation is simple. The one-to-one design of the collet change blocks 31 and the inner support bodies 11 can ensure the precise positioning of the workpiece during processing, reducing the processing errors caused by the position deviation of the annular workpiece 200. The one-to-one correspondence between the collet change blocks 31 and the inner support bodies 11 enables the collet change blocks 31 and the corresponding inner support bodies 11 to be closely matched, contributing to improving the stability and accuracy of annular machining clamping.

[0079] Referring to Figure 1 and Figure 2 , in one embodiment, the inner expanding collet assembly 10 further includes an annular support seat 4. The annular support seat 4 is sleeved outside the inner expanding rod 2 and extends radially along the inner expanding rod 2. The annular support seat 4 is elastically connected to one end of the inner expanding sleeve 1, and the annular support seat 4 is used to be installed on the machine base 20. Thus, the annular support seat 4 is sleeved outside the inner expanding rod 2 and extends radially along it. This design can effectively disperse the stress and pressure received by the inner expanding rod 2 during operation. By increasing the support area and reducing the stress concentration per unit area, the structural stability and durability of the entire inner expanding collet assembly 10 are improved. The annular support seat 4 provides additional support for the inner expanding rod 2, enhancing its ability to resist bending and deformation. The presence of the annular support seat 4 enhances the overall strength of the entire inner expanding collet assembly 10, enabling the inner expanding collet assembly 10 to carry a greater load and meet a wider range of processing requirements.

[0080] It should be noted that, in one embodiment, the annular support base 4 and the inner expansion sleeve 1 can be integrally formed. In other embodiments, the annular support base 4 and the inner expansion sleeve 1 can be separately provided and connected by welding, glue bonding or other connection structures. Specifically, the present application does not limit the connection manner between the annular support base 4 and the inner expansion sleeve 1.

[0081] In addition, the annular support base 4 is further provided with a plurality of insertion holes for a plurality of screw connectors to be inserted. The plurality of screw connectors are used for threaded connection with the base. In this way, the inner chuck assembly 10 and the machine base 20 can be quickly connected and disassembled. This design simplifies the installation process and reduces the installation difficulty and time cost.

[0082] Refer to Figure 2 and Figure 3 , in one embodiment, the inner support body 11 has a first end face 111 away from the annular support base 4. The chuck conversion block 31 includes a fitting block 311 and a limiting platform 312 connected to the fitting block 311. The fitting block 311 is disposed opposite to the outer side wall of the inner support body 11. The limiting platform 312 is disposed on the side of the fitting block 311 facing the inner support body 11 and is used to abut against the first end face 111. In this way, the limiting platform 312 abuts against the first end face 111 of the inner support body 11, providing a clear positioning reference for the chuck conversion block 31. This design ensures that the installation position of the chuck conversion block 31 on the inner support body 11 is accurate, avoiding problems such as unstable clamping or decreased machining accuracy caused by position deviation. I will modify it so that the installation process of the chuck conversion block 31 is more simple and fast. The operator only needs to align the chuck conversion block 31 with the inner support body 11 and push it until the limiting platform 312 abuts against the first end face 111 to complete the installation. This design reduces the installation difficulty and time cost. The design of the limiting platform 312 increases the contact area between the chuck conversion block 31 and the inner support body 11, thereby improving the connection stability. During the working process, even when subjected to external impact or vibration, the chuck conversion block 31 can maintain a stable connection state and is not prone to looseness or detachment.

[0083] Refer to Figure 2 and Figure 3, in some embodiments, the outer side of the end of the collet changeover block 31 facing away from the annular support base 4 is provided with a step, so as to form a step surface 3111 facing away from the annular support base 4. The step surface 3111 is used to abut against the side of the annular workpiece 200 facing the annular support base 4. In this way, the design of the step surface 3111 enables the annular workpiece 200 to be accurately placed on the collet changeover block 31 and closely fit with the step surface 3111. This design reduces the position deviation of the workpiece during the machining process and improves the positioning accuracy. The step surface 3111 provides a stable support surface for the annular workpiece 200, making it difficult for the annular workpiece 200 to shake or shift during the machining process. This stability helps to maintain the consistency of the machining trajectory and improve the machining quality. Due to the existence of the step surface 3111, it is more difficult for the annular workpiece 200 to fall off the collet changeover block 31 during the machining process.

[0084] Continue to refer to Figure 2 and Figure 3 , in some embodiments, the collet changeover block 31 further forms a limiting surface 3112 facing away from the inner support body 11. The limiting surface 3112 is connected to the step surface 3111 and is used to abut against the inner side wall of the annular workpiece 200 facing the inner support body 11. In this way, through the combined action of the step surface 3111 and the limiting surface 3112, three-dimensional positioning of the annular workpiece 200 on the collet changeover block 31 is achieved. The step surface 3111 ensures the positioning of the annular workpiece 200 in the axial direction of the inner support expanding sleeve 1, while the limiting surface 3112 ensures the positioning of the annular workpiece 200 in the radial direction of the inner support expanding sleeve 1. This design greatly improves the positioning accuracy of the annular workpiece 200 during the machining process. Since the limiting surface 3112 is used to closely abut against the inner side wall of the annular workpiece 200, it restricts the radial movement of the annular workpiece 200 during the machining process and realizes the clamping of the annular workpiece 200, which helps to reduce the machining errors caused by the position deviation of the annular workpiece 200 in the subsequent machining process and improve the machining quality. The step surface 3111 and the limiting surface 3112 jointly provide double support for the annular workpiece 200. This design makes the annular workpiece 200 more stable during the machining process and less likely to shake or shift. It enhances the clamping stability and improves the safety of the machining process.

[0085] Refer to Figure 1 and Figure 2, in some embodiments, a buffer gap is formed between two adjacent inner support bodies 11 and the annular support seat 4. The elastic connecting member 12 includes a plurality of elastic members 121, and each buffer gap is provided with an elastic member 121. The elastic member 121 is used to seal the buffer gap. In this way, when an external force along the radial direction of the inner support rod 2 is applied to the inner support body 11 by the inner support rod 2, the gap provides a movement space for the plurality of inner support bodies 11 to move away from each other. And the elastic member 121 in the gap enables the plurality of inner support bodies 11 to move closer to each other when the external force applied by the inner support rod 2 to the inner support body 11 is removed, so that the plurality of inner support bodies 11 are reset, preparing for clamping the annular workpiece 200 next time. By setting the gap and installing the elastic member 121, the direct contact and collision between adjacent inner support bodies 11 can be effectively reduced, thereby avoiding the possible structural damage phenomenon of the inner support body 11 under extreme working conditions. This design improves the safety and reliability of the structure. The elastic member 121 can be closely connected to two adjacent inner support bodies 11 and the annular support seat 4, enabling the elastic member 121 to seal the gap to block the debris generated by machine tool processing from entering the inner support chuck assembly 10, playing a protective role.

[0086] Refer to Figure 6 and Figure 7 , Figure 6 is Figure 5 a schematic cross-sectional view of the inner support fixture shown, Figure 7 is Figure 6 a partially enlarged schematic view of part A shown. In one embodiment, a first annular groove 41 is provided on the inner side wall of the annular support seat 4 facing the inner support rod 2. The inner support chuck assembly 10 further includes a first sealing ring 51. The first sealing ring 51 is installed in the first annular groove 41. The first sealing ring 51 is used to seal the gap between the annular support seat 4 and the inner support rod 2. In this way, the setting of the first sealing ring 51 can form a reliable sealing barrier between the annular support seat 4 and the inner support rod 2, thereby effectively preventing external foreign objects from infiltrating into the structure through the gap between the annular support seat 4 and the inner support rod 2 and keeping the internal environment of the structure clean and stable. In addition, due to the presence of the first sealing ring 51, the direct contact between the annular support seat 4 and the inner support rod 2 is avoided, reducing the wear caused by friction. This helps to extend the service life of the structural components and reduce the maintenance cost. The design of the first annular groove 41 makes the installation of the first sealing ring 51 relatively simple. In addition, the design of the first annular groove 41 also provides a reliable support for the installation and fixation of the first sealing ring 51, enhancing the durability and reliability of the seal.

[0087] It should be noted that the first sealing ring 51 is made of wear-resistant and corrosion-resistant materials and can maintain stable sealing performance in harsh working environments. Specifically, the material of the first sealing ring 51 can include at least one of silicone rubber (VMQ), nitrile rubber (NBR), ethylene propylene diene monomer rubber (EPDM), polyurethane rubber (PU), fluororubber (FKM), hydrogenated nitrile rubber (HNBR), chloroprene rubber (CR), and acrylate rubber (ACM). Specifically, the material of the first sealing ring 51 can be selected as needed, and the present application does not limit this.

[0088] Continuing to refer to Figure 6 and Figure 7 , in some embodiments, the annular support base 4 is provided with a second annular groove 42 on the side facing the machine base 20. The inner support chuck assembly 10 further includes a second sealing ring 52. The second sealing ring 52 is installed in the second annular groove 42. The second sealing ring 52 is used to seal the gap between the annular support base 4 and the machine base 20. In this way, the second sealing ring 52 can form a reliable sealing barrier between the annular support base 4 and the machine base 20. This design can effectively prevent external impurities from seeping into the internal structure through the gap and maintain the cleanliness and stability of the internal environment of the structure. The presence of the second sealing ring 52 avoids direct contact between the annular support base 4 and the machine base 20, reducing wear caused by friction. This helps to extend the service life of the structural components and reduce maintenance costs. The design of the second annular groove 42 makes the installation of the second sealing ring 52 equally simple. In addition, the design of the second annular groove 42 provides stable support for the installation and fixation of the second sealing ring 52, further enhancing the durability and reliability of the seal.

[0089] It should be noted that the second sealing ring 52 is made of wear-resistant and corrosion-resistant materials and can maintain stable sealing performance in harsh working environments. Specifically, the material of the second sealing ring 52 can include at least one of silicone rubber (VMQ), nitrile rubber (NBR), ethylene propylene diene monomer rubber (EPDM), polyurethane rubber (PU), fluororubber (FKM), hydrogenated nitrile rubber (HNBR), chloroprene rubber (CR), and acrylate rubber (ACM). Specifically, the material of the second sealing ring 52 can be selected as needed, and the present application does not limit this.

[0090] Refer to Figure 4 and Figure 5 , Figure 4 is a schematic structural diagram of the inner support fixture clamping the annular workpiece provided in the exemplary embodiment of the present disclosure, Figure 5 is Figure 4Partial structural schematic diagram of the internal support fixture shown. According to the second aspect of the present disclosure, an internal support fixture is provided, which includes a machine base 20, the above-mentioned internal support chuck assembly 10, and a driving assembly 30. The internal support chuck assembly 10 is installed on the machine base 20, the driving assembly 30 is arranged corresponding to the internal support chuck assembly 10 and is installed on the machine base 20, and the driving assembly 30 is used to drive the internal support pull rod 2 to move.

[0091] In the internal support fixture of the embodiment of the present application, according to the annular workpiece 200 to be clamped, a suitable chuck portion 3 is selected from multiple chuck portions 3, and the chuck portion 3 is sleeved on the internal support expanding sleeve 1. By driving the internal support pull rod 2 to move through the driving assembly 30, an external force along the radial direction of the internal support pull rod 2 is applied to push the internal support expanding sleeve 1 and the chuck portion 3 to move in a direction away from the internal support pull rod 2, so that the chuck portion 3 abuts against the annular workpiece 200 of the corresponding size, realizing all-round clamping of the annular workpiece 200, thereby significantly improving the machining accuracy of the annular workpiece 200. The design of the internal support chuck assembly 10 enables that when machining different annular workpieces 200, only the appropriate chuck portion 3 needs to be quickly replaced, improving the versatility of the internal support fixture and greatly saving operation time and production costs.

[0092] Referring to Figure 5 , in one embodiment, the machine base 20 includes a bearing portion 201 and at least two support portions 202. The bearing portion 201 is provided with an installation hole 2011 penetrating along its thickness direction. One side of the bearing portion 201 along its thickness direction is for installing the internal support expanding sleeve 1, so that the through hole of the internal support expanding sleeve 1 is communicated with the installation hole 2011.

[0093] It should be noted that there are various shapes of the bearing portion 201. For example, in one embodiment, the bearing portion 201 can be a plate-like structure extending horizontally. In other embodiments, the bearing plate can also be a plate-like structure extending vertically. Specifically, the present application does not limit the specific shape of the bearing portion 201.

[0094] In addition, there are various ways for the through hole of the inner support expanding sleeve 1 to communicate with the mounting hole 2011. For example, in one embodiment, the axis of the through hole of the inner support expanding sleeve 1 is arranged parallel to the axis of the mounting hole 2011, and one end of the through hole of the inner support expanding sleeve 1 is communicated with one end of the mounting hole 2011. Specifically, in the embodiment of the present application, the axis of the through hole of the inner support expanding sleeve 1 coincides with the axis of the mounting hole 2011, and one end of the through hole of the inner support expanding sleeve 1 is communicated with one end of the mounting hole 2011. In this way, the coincidence of the axes of the through hole and the mounting hole 2011 can ensure that when the driving assembly 30 applies force to the inner support pull rod 2, the force can be accurately transmitted to the inner support pull rod 2 along a straight line, reducing the extra friction and energy loss caused by axis deviation. The design of the coincident axes also makes the position of the inner support expanding sleeve 1 in the mounting hole 2011 more accurate and stable, avoiding the clamping instability or workpiece processing error caused by position deviation. The design that the axis of the through hole of the inner support expanding sleeve 1 coincides with and is communicated with the axis of the mounting hole 2011 makes the overall design of the inner support fixture more compact and reasonable. This not only reduces the manufacturing cost, but also improves the reliability and service life of the inner support fixture.

[0095] At least two supporting parts 202 are arranged on the other side of the bearing part 201 along its thickness direction and are connected to the bearing part 201. The at least two supporting parts 202 are arranged at intervals, so that an installation space 203 communicated with the mounting hole 2011 is formed jointly between the at least two supporting parts 202 and the bearing part 201. The installation space 203 is for installing the driving assembly 30. The driving assembly 30 is adapted to be drivingly connected with the inner support pull rod 2 through the mounting hole 2011. In this way, the setting of the at least two supporting parts 202 effectively disperses the load-bearing of the bearing part 201, reduces the risk of single-point stress, and thus enhances the stability and rigidity of the entire machine base 20. The installation space 203 formed jointly by the supporting part 202 and the bearing part 201 facilitates the installation of the driving assembly 30 and realizes the hidden installation of the driving assembly 30. To a certain extent, the structure of the inner support fixture is made compact and the aesthetic degree of the inner support fixture is improved. The direct communication between the installation space 203 and the mounting hole 2011 enables the driving assembly 30 to be conveniently drivingly connected with the inner support pull rod 2 through the mounting hole 2011. This design simplifies the connection process and improves the accuracy and efficiency of the connection.

[0096] It should be noted that there are various connection methods between the bearing part 201 and the at least two supporting parts 202. For example, in one embodiment, the bearing part 201 and the at least two supporting parts 202 can be fixed by welding. In other embodiments, the bearing part 201 and the at least two supporting parts 202 can also be connected by a threaded structure. Specifically, the connection method between the bearing part 201 and the at least two supporting parts 202 can be set as required, and the present application does not limit this.

[0097] Refer toFigure 4 In one embodiment, the machine base 20 further includes a housing 204. The housing 204 is provided with a through hole, which is correspondingly arranged with the mounting hole 2011. The housing 204 forms a mounting cavity. The bearing part 201 and at least two supporting parts 202 are both installed in the mounting cavity. The inner support chuck assembly 10 extends out from the through hole so that the chuck part 3 abuts against the annular workpiece 200 for sleeving on the chuck part 3. By integrating key components such as the bearing part 201, the supporting part 202 and the inner support chuck assembly 10 in the mounting cavity of the housing 204, the space occupied by the overall equipment is greatly saved, making the whole structure more compact. The presence of the housing 204 plays a protective role for the internal components, preventing the direct influence of external factors on them and reducing the risk of equipment damage. In addition, the housing 204 can block most of the debris generated by machining the workpiece of the machine tool from entering the inside of the housing 204, making it more convenient and fast when the air gun or air knife is used to blow and clean the debris.

[0098] Refer to Figure 4 and Figure 5 The machine base 20 is also provided with a handle 50. The handle 50 provides a direct and stable grasping point for the operator, making it easier and faster to manually carry or move the fixture. The setting of the handle 50 also reduces the risk of accidents caused by slipping or instability during the handling process.

[0099] It should be noted that the shape of the handle 50 has various types, and the present application does not limit the specific shape of the handle 50.

[0100] Refer to Figure 4 The inner support fixture further includes a silica gel protection sheet 60. The silica gel protection sheet 60 is sleeved around the inner support chuck assembly 10 to prevent the fine debris generated by machining the machine tool from entering the inside of the housing 204.

[0101] Refer to Figure 5 The bearing part 201 is provided with a plurality of support columns 2013 extending in the thickness direction. The plurality of support columns 2013 are arranged at intervals. The housing 204 is provided with a plurality of insertion holes. The plurality of support columns 2013 are respectively inserted into the plurality of insertion holes. In this way, the positioning and installation between the housing 204 and the bearing part 201 are realized, the operation is simple, and the relative movement between the housing 204 and the bearing part 201 can be prevented.

[0102] Refer to Figure 6, in some embodiments, the driving assembly 30 includes a cylinder 301. The cylinder block 3011 of the cylinder 301 is connected to the bearing portion 201, and the piston rod 3012 of the cylinder 301 is drivingly connected to the inner support pull rod 2. In this way, as the driving assembly 30, the piston rod 3012 of the cylinder 301 is directly drivingly connected to the inner support pull rod 2. This direct driving method reduces the intermediate transmission links and improves the efficiency of power transmission. At the same time, since the accumulation of transmission errors is reduced, the control is more accurate. The cylinder 301 has the characteristic of fast response speed and can generate sufficient driving force in a short time, enabling the inner support pull rod 2 to move quickly so that the inner support expansion sleeve 1 and the clamping head 3 are expanded or restored, thereby realizing the rapid clamping or release of the annular workpiece 200. The cylinder 301 uses compressed air as the power source. Compared with other transmission methods such as hydraulic transmission, compressed air is cleaner and pollution-free. This helps to reduce the pollution of the working environment and reduce the corrosion and wear of the inner support fixture itself. During the process of clamping and releasing the annular workpiece 200, the cylinder 301 can efficiently utilize the energy of compressed air and reduce energy waste. At the same time, due to the renewable nature of compressed air, this transmission method also conforms to the concept of sustainable development. The structure of the cylinder 301 is relatively simple and is easy to install and disassemble. When maintenance or replacement of the cylinder 301 is required, the operation can be carried out conveniently and quickly.

[0103] It should be noted that in the embodiments of the present application, the cylinder 301 is a cylinder with a large bore diameter. By enabling the cylinder 301 to have a cushion buffer function, since the thrust or impact force of the piston of the cylinder 301 on the cylinder block 3011 is relatively large when the piston moves to the end of the stroke, the cushion buffer has a good buffer and protection effect on the piston of the cylinder 301. In this way, the service life of the cylinder 301 can be extended. Of course, in other embodiments, the driving assembly 30 may also include a linear motor, an electric push rod, a hydraulic cylinder, etc. Specifically, the present application does not limit the type of the driving assembly 30.

[0104] Refer to Figure 6, in some embodiments, a third annular groove 30111 is provided on one side of the cylinder block 3011 of the cylinder 301 facing the bearing part 201. The inner support fixture further includes a third sealing ring 40, and the third sealing ring 40 is installed in the third annular groove 30111 to seal the gap between the cylinder block 3011 of the cylinder 301 and the bearing part 201. Thus, as a sealing element, the third sealing ring 40 can effectively prevent cutting fluid or tiny powder chips from infiltrating into the interior of the cylinder 301 through the gap between the cylinder block 3011 of the cylinder 301 and the bearing part 201, and extend the service life of the cylinder 301. The good sealing performance between the cylinder block 3011 of the cylinder 301 and the bearing part 201 ensures that the cylinder 301 can give full play to its performance, quickly respond and accurately control the telescopic movement of the inner support pull rod 2, thereby improving the working efficiency of the entire inner support fixture. The presence of the third sealing ring 40 reduces the direct contact and friction between the cylinder block 3011 and the bearing part 201, thereby reducing the wear rate of these two components. This helps to extend the service life of the cylinder 301 and the inner support fixture, and reduce the maintenance and replacement costs caused by component wear. The setting of the third annular groove 30111 facilitates the installation of the third sealing ring 40.

[0105] Referring to Figure 6 , in one embodiment, one end of the inner support pull rod 2 is threadedly connected to the free end of the piston rod 3012. Thus, the threaded connection can ensure a tight and firm connection between the inner support pull rod 2 and the piston rod 3012, and it is not easy to loosen or fall off. The threaded connection also has a certain self-locking function, that is, in the absence of external force, along the axial direction of the inner support pull rod 2, the inner support pull rod 2 and the piston rod 3012 can directly maintain a relatively stable state and are not easy to displace or loosen. The threaded connection has the advantage of simple installation. During the installation process, only the threaded part of the inner support pull rod 2 needs to be aligned with the free end of the piston rod 3012 and tightened, without the need for complex tools or equipment. Similarly, when it is necessary to disassemble the inner support pull rod 2, only the connection part needs to be loosened and separated. This easy-to-disassemble characteristic makes the maintenance and replacement work of the inner support fixture more convenient and fast. The threaded connection also has a certain adjustability. By rotating the threaded part, the relative position between the inner support pull rod 2 and the piston rod 3012 can be finely adjusted to adapt to different working requirements or compensate for the gap caused by wear.

[0106] Continuing to refer to Figure 6 and Figure 8 , Figure 8FIG. 0 is a schematic structural view of the bearing part provided in an exemplary embodiment of the present disclosure. In one embodiment, the free end of the piston rod 3012 is located within the mounting hole 2011. The bearing part 201 is provided with a through hole 2012 in the horizontal direction. The through hole 2012 communicates with the mounting hole 2011. The through hole 2012 is used for the anti-rotation part to extend into, so as to limit the rotation of the piston rod 3012 relative to the bearing part 201 through the anti-rotation part. In this way, by the anti-rotation part extending into the through hole 2012 and restricting the rotation of the piston rod 3012, when one end of the inner support rod 2 needs to be threadedly connected to the free end of the piston rod 3012, only one end of the inner support rod 2 needs to be aligned with the free end of the piston rod 3012, and then the inner support rod 2 is rotated to stably connect one end of the inner support rod 2 with the free end of the piston rod 3012, and the operation is simple.

[0107] It should be noted that there are various types of anti-rotation parts. For example, in one embodiment, the anti-rotation part may include a wrench. In other embodiments, it may also be that the piston rod is provided with an anti-rotation hole axially penetrating the through hole, and the anti-rotation part may include a pin, and the pin is inserted into the anti-rotation hole to realize the restriction of the rotation of the piston rod 3012. Specifically, the present application does not limit the type of the anti-rotation part.

[0108] Refer to Figure 5 , in one embodiment, the inner support fixture further includes a cover plate 70. The cover plate 70 is arranged to cover the through hole 2012 and is fixed to the bearing part. In this way, the through hole 2012 is sealed by the cover plate 70, preventing the cutting fluid ejected during workpiece processing from penetrating into the cylinder through the through hole 2012.

[0109] Refer to Figure 4 and Figure 5 , in some embodiments, a plurality of inner support chuck assemblies 10 are provided. The plurality of inner support chuck assemblies 10 are spaced apart and arranged on the machine base 20. In this way, the plurality of inner support chuck assemblies 10 can simultaneously clamp and process a plurality of workpieces to achieve parallel processing, thereby significantly shortening the production cycle and improving the overall production efficiency. Since the inner support chuck assembly 10 is an independent unit, when a certain inner support chuck assembly 10 fails, it can be repaired or replaced separately, reducing the maintenance cost and downtime of the overall inner support fixture. The dispersed layout of the plurality of inner support chuck assemblies 10 helps to disperse the impact force and vibration during the processing, improving the stability and safety of the operation of the inner support fixture.

[0110] It should be noted that the number of the inner support chuck assemblies 10 can be 3, 4, 5, 8, etc. Specifically, the present application does not limit the number of the inner support chuck assemblies 10.

[0111] Refer to Figure 5, in some embodiments, a plurality of driving components 30 are provided. The plurality of driving components 30 are arranged in one-to-one correspondence with a plurality of inner support chuck components 10. Each driving component 30 is used to drive the inner support pull rod 2 of the corresponding inner support chuck component 10. Each inner support chuck component 10 is controlled by an independent driving component 30, enabling more precise control and adjustment. This one-to-one correspondence ensures that each inner support chuck component 10 can precisely clamp according to the characteristics of the workpiece and the processing requirements, thereby improving the clamping accuracy and stability. Since each inner support chuck component 10 is driven by an independent driving component 30, they can simultaneously and evenly apply clamping force to the workpiece, avoiding workpiece deformation or processing errors caused by uneven clamping force.

[0112] Referring to Figure 4 and Figure 5 , in one embodiment, the inner support fixture further includes a control mechanism. The control mechanism is at least two manual valves 80. One of the at least two manual valves 80 individually controls a part of the plurality of inner support chuck components 10, and the other of the at least two manual valves 80 individually controls another part of the plurality of inner support chuck components 10. Thus, when an artificial worker places the annular workpiece 200 on the inner support chuck component 10, by toggling the manual valve 80, the reciprocating movement of the piston rod 3012 of the cylinder 301 can be controlled. The structure is simple and easy to operate, improving the efficiency of clamping and positioning the annular workpiece 200.

[0113] It should be noted that in other embodiments, a single manual valve 80 can also be used to control a plurality of inner support chuck components simultaneously. Specifically, the present application does not limit this.

[0114] In the description of the present application, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of the present application, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0115] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0116] Among the embodiments, embodiments, and related technical features of the present application, they can be combined and replaced with each other without conflict.

[0117] The above are only the preferred embodiments of the present application and do not impose any form of limitation on the present application. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the technical solution of the present application.

Claims

1. An internal support chuck assembly, characterized in that, include: Internal support sleeve; The inner support rod can be inserted into the inner support sleeve along its axial direction, and the outer wall of the inner support rod is tapered to the inner wall of the inner support sleeve; A plurality of chuck parts, each of which is used to be externally mounted on the inner support sleeve, wherein the thickness of the plurality of chuck parts along the radial direction of the inner support sleeve is set differently, and one of the plurality of chuck parts is sleeved on the outer side wall of the inner support sleeve; The inner support rod can move relative to the inner support sleeve and expand the inner support sleeve and the chuck portion so that the chuck portion abuts against the annular workpiece that is used to be sleeved on the chuck portion.

2. The inner support chuck assembly according to claim 1, characterized in that, The inner support sleeve includes: A plurality of inner support bodies, the plurality of inner support bodies are arranged at intervals along the circumference of the inner support rod, and the side of the plurality of inner support bodies facing the inner support rod is suitable for tapering with the outer side wall of the inner support rod; An elastic connecting piece is elastically connected to each of the inner supporting bodies.

3. The inner support chuck assembly according to claim 2, wherein, Each of the chuck parts includes a plurality of chuck shape-changing blocks, which are arranged around the circumference of the inner support expansion sleeve. Each of the chuck shape-changing blocks is detachably connected to at least one of the plurality of inner support bodies.

4. The inner support chuck assembly according to claim 3, wherein Each of the inner support bodies is extended along the circumference of the inner support rod; and / or, Each of the chuck changing blocks is used to extend along the circumference of the inner expansion sleeve.

5. The inner support chuck assembly according to claim 3, wherein, The plurality of chuck shape-changing blocks are arranged in one-to-one correspondence with the plurality of inner support bodies, and each of the chuck shape-changing blocks is detachably connected to the corresponding inner support body.

6. The inner support chuck assembly according to any one of claims 3 to 5, characterized in that It also includes an annular support seat, which is externally mounted on the inner support rod and extends radially along the inner support rod. The annular support seat is elastically connected to one end of the inner support sleeve and is used to be installed on the machine base.

7. The inner support chuck assembly according to claim 6, wherein, The inner support body has a first end face away from the annular support seat, and the chuck changing block includes a fitting block and a limit platform connected to the fitting block. The fitting block is arranged opposite to the outer side wall of the inner support body, and the limit platform is arranged on the side of the fitting block facing the inner support body, and the limit platform is used to abut against the first end face.

8. The inner support chuck assembly according to claim 7, wherein, The outer side of the end of the fitting block away from the annular support seat is stepped to form a step surface away from the annular support seat, and the step surface is used to abut against the side of the annular workpiece facing the annular support seat.

9. The inner support chuck assembly according to claim 8, characterized in that, The fitting block further forms a limiting surface disposed away from the inner supporting body, the limiting surface being connected to the step surface, and the limiting surface being used to abut against the inner side wall of the annular workpiece facing the inner supporting body.

10. The inner support chuck assembly according to claim 6, wherein, A gap is formed between two adjacent inner support bodies and annular support seats; The elastic connecting member includes a plurality of elastic members, each of the gaps is equipped with an elastic member, and the elastic member is used to seal the gap.

11. The inner support chuck assembly according to claim 6, characterized in that, The inner side wall of the annular support seat facing the inner support rod is provided with a first annular groove, and the inner support chuck assembly further includes a first sealing ring, which is installed in the first annular groove and is used to seal the gap between the annular support seat and the inner support rod; and / or, The annular support base is provided with a second annular groove on the side facing the machine base. The inner support chuck assembly further includes a second sealing ring, and the second sealing ring is installed in the second annular groove. The second sealing ring is used to seal the gap between the annular support base and the machine base.

12. An internal support fixture, characterized in that, Comprising: Machine base; The inner support chuck assembly according to any one of claims 1 to 11, and the inner support chuck assembly is installed on the machine base; A driving assembly, which is arranged corresponding to the inner support chuck assembly and is installed on the machine base, and the driving assembly is used to drive the inner support pull rod to move.

13. The inner support fixture according to claim 12, characterized in that, The machine base includes: A bearing part, which is provided with an installation hole penetrating along its thickness direction. One side of the bearing part along its thickness direction is for installing the inner support expanding sleeve, so that the through hole of the inner support expanding sleeve is communicated with the installation hole; At least two support parts, which are arranged on the other side of the bearing part along its thickness direction and are connected to the bearing part. At least two of the support parts are arranged at intervals, so that an installation space communicated with the installation hole is jointly enclosed between at least two of the support parts and the bearing part. The installation space is for installing the driving assembly, and the driving assembly is adapted to be drivingly connected with the inner support pull rod through the installation hole.

14. The inner support fixture according to claim 13, wherein The driving assembly includes a cylinder, the cylinder block of the cylinder is connected to the bearing part, and the piston rod of the cylinder is drivingly connected to the inner support pull rod.

15. The inner support fixture according to claim 14, characterized in that, The cylinder block of the cylinder is provided with a third annular groove on the side facing the bearing part; The inner support fixture further includes a third sealing ring, and the third sealing ring is installed in the third annular groove to seal the gap between the cylinder block of the cylinder and the bearing part.

16. The inner support fixture according to claim 14, wherein, One end of the inner support pull rod is threadedly connected to the free end of the piston rod.

17. The inner support fixture according to claim 16, characterized in that, The free end of the piston rod is located in the installation hole; The bearing part is provided with a through hole along the horizontal direction, and the through hole is communicated with the installation hole. The through hole is used for the anti-rotation part to extend into, so as to limit the rotation of the piston rod relative to the bearing part through the anti-rotation part.

18. The inner support fixture according to any one of claims 12 to 17, characterized in that, A plurality of inner support chuck assemblies are provided, and the plurality of chuck assemblies are arranged at intervals on the machine base.

19. The inner support fixture according to claim 18, characterized in that, A plurality of driving assemblies are provided, and the plurality of driving assemblies are arranged in one-to-one correspondence with the plurality of inner support chuck assemblies. Each driving assembly is used to drive the inner support pull rod of the corresponding inner support chuck assembly to move.

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