Clamp device for grinding inner hole of shaft

Abstract

The invention discloses a clamp device for grinding an inner hole of a shaft, and relates to the technical field of clamps, the clamp device comprises a first clamp structure, a second clamp structure and a third clamp structure, the first clamp structure is used for being fixed to a chuck, and a first fixing hole for assembling the shaft is defined by the first clamp structure; and the second clamp structure is used for being installed on the chuck, a second fixing hole used for assembling the shaft is defined by the second clamp structure, the first fixing hole and the second fixing hole are opposite in the first direction and are spaced, and the first fixing hole and the second fixing hole can be used for assembling the shaft at the same time. Therefore, by arranging the clamp device, the number of parts of the clamp device is reduced, the clamp device is convenient to produce and manufacture, and the production and manufacturing cost of the clamp device is reduced.

Description

Technical Field

[0001] This invention relates to the field of fixture technology, and in particular to a fixture device for grinding the inner bore of a shaft. Background Technology

[0002] In related technologies, existing fixtures for grinding inner holes of shafts have complex structures, are not easy to manufacture, and have high costs. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a clamping device for grinding the inner bore of a shaft, which is advantageous in reducing the number of parts in the clamping device and in reducing the manufacturing cost of the clamping device.

[0004] According to a first aspect of the present invention, a clamping device for grinding the inner hole of a shaft includes: a first clamping structure for fixing to a chuck, the first clamping structure defining a first fixing hole for assembling a shaft; and a second clamping structure for mounting to the chuck, the second clamping structure defining a second fixing hole for assembling a shaft, the first fixing hole and the second fixing hole being opposite to and spaced apart along a first direction, and the first fixing hole and the second fixing hole being capable of assembling a shaft simultaneously.

[0005] According to the first aspect of the invention, the clamping device has fewer components compared to the prior art, which is beneficial to reducing the number of parts in the clamping device, facilitating the production and manufacturing of the clamping device, and reducing the production and manufacturing cost of the clamping device.

[0006] In some examples of the present invention, the first clamp structure includes: a structural body and a mounting part, the structural body being annular to define a first fixing hole, and the mounting part being fixedly connected to the structural body and used for fixing to the chuck.

[0007] In some examples of the present invention, there are multiple mounting parts, which are arranged sequentially along the circumference of the structural body.

[0008] In some examples of the present invention, a first buffer layer is formed on the inner sidewall of the first fixing hole, the first buffer layer being annular and extending circumferentially along the first fixing hole.

[0009] In some examples of the present invention, the second clamping structure includes a clamping sleeve, which is annular to define a second fixing hole.

[0010] In some examples of the present invention, the clamping sleeve includes a plurality of sub-clamping sleeves and a plurality of flexible connecting portions. The plurality of sub-clamping sleeves are arranged sequentially along the circumference of the clamping sleeve. Any two adjacent sub-clamping sleeves are connected by the flexible connecting portions along the circumference of the clamping sleeve, so that the sub-clamping sleeves are movable in the radial direction of the clamping sleeve.

[0011] In some examples of the present invention, the second clamping structure further includes: a plurality of driving parts, the plurality of driving parts being located on the radial outer side of the clamping sleeve and arranged sequentially along the circumference of the clamping sleeve, the plurality of driving parts being mounted on the chuck, the plurality of driving parts and the plurality of sub-clamping sleeves being fixedly connected in a one-to-one correspondence, and the driving parts being used to drive the corresponding sub-clamping sleeves to move radially along the clamping sleeve.

[0012] In some examples of the present invention, each drive unit is movably mounted on the chuck along the radial direction of the clamping sleeve to drive the corresponding sub-clamping sleeve to move.

[0013] In some examples of the present invention, the drive unit includes: a first body and a second body, the first body and corresponding sub-clamping sleeves are arranged radially spaced apart along the clamping sleeves, and the first body extends along a first direction, and the second body is connected between the first body and the corresponding sub-clamping sleeves.

[0014] In some examples of the invention, the first body is formed with a mounting hole extending in a first direction for fasteners to pass through; and / or the first body has a mounting end for engaging with a chuck, the mounting end being formed with a groove extending radially along the clamping sleeve for engaging with the chuck.

[0015] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is an assembly diagram of the clamping device and the shaft according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the clamping device according to an embodiment of the present invention.

[0017] Figure label: Clamping device 100; First clamping structure 200; first fixing hole 210; structural body 220; mounting part 230; first buffer layer 211; mounting hole 231; Second clamping structure 300; second fixing hole 310; clamping sleeve 320; driving part 330; second buffer layer 311; sub-clamping sleeve 321; flexible connecting part 322; first body 331; second body 332; assembly hole 333; assembly end 334; slide groove 335; Shaft 400. Detailed Implementation

[0018] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0019] The following is for reference. Figures 1-2 A clamping device 100 for grinding the inner bore of shaft 400 according to an embodiment of the present invention is described.

[0020] like Figures 1-2 As shown, according to a first aspect embodiment of the present invention, a clamping device 100 for grinding an inner hole of a shaft 400 includes: a first clamping structure 200 for fixing to a chuck, the first clamping structure 200 defining a first fixing hole 210 for assembling the shaft 400; and a second clamping structure 300 for mounting to the chuck, the second clamping structure 300 defining a second fixing hole 310 for assembling the shaft 400, the first fixing hole 210 and the second fixing hole 310 being opposite to and spaced apart along a first direction, and the first fixing hole 210 and the second fixing hole 310 being capable of simultaneously assembling the shaft 400.

[0021] In this embodiment, the first clamping structure 200 and the second clamping structure 300 are arranged along a first direction. The first clamping structure 200 can be formed from materials such as 45# steel or gray cast iron. The second clamping structure 300 can be installed on the chuck using fasteners such as bolts and clips. The first direction in this embodiment is... Figure 1 In the X direction. When grinding the inner hole of shaft 400, shaft 400 is simultaneously assembled into the first fixing hole 210 and the second fixing hole 310, fixing shaft 400 to the clamping device 100. Exemplarily, one end of the assembled shaft 400 is assembled into the first fixing hole 210, and the other end of the assembled shaft 400 is assembled into the second fixing hole 310. The shaft 400 in this application can be a reducer input shaft. In an exemplary embodiment, the walls of both the first fixing hole 210 and the second fixing hole 310 can be made of metal material.

[0022] The clamping device 100 of this application adopts a horizontal clamping method. In an exemplary embodiment, a first clamping structure 200 is fixed to a chuck to fix the bearing seat at the non-machined end of the shaft 400, while a second clamping structure 300 clamps the outer circle of the bearing seat on the side of the shaft 400 where the inner hole is being ground. After the shaft 400 is completely fixed, inner hole grinding is performed. The first fixing hole 210 and the second fixing hole 310 are arranged at intervals relative to each other along a first direction. The shaft 400 is simultaneously assembled in both the first fixing hole 210 and the second fixing hole 310, and the first clamping structure 200 and the second clamping structure 300 simultaneously clamp the shaft 400, limiting its position. This helps reduce the risk of radial movement and axial displacement of the shaft 400 during grinding, thereby reducing the vibration phenomenon of the shaft 400 during grinding, facilitating complete positioning and clamping of the shaft 400, promoting efficient and stable inner hole grinding after heat treatment, and improving the machining accuracy of the inner hole of the shaft 400. The clamping device 100 of this application has fewer parts than the conventional clamping device 100, which facilitates the production and manufacturing of the clamping device 100, helps to reduce the production and manufacturing cost of the clamping device 100, and also helps to simplify the assembly steps of the clamping device 100.

[0023] Simultaneous assembly of the first fixing hole 210 and the second fixing hole 310 of the shaft 400 facilitates rapid one-time clamping of the shaft 400 during the internal hole grinding process, eliminating the need for mid-process adjustments or secondary clamping. This directly reduces the clamping time for the internal hole grinding process, thereby increasing the number of shafts 400 processed per unit time and improving the processing efficiency of the shaft 400. In this application, both the first clamping structure 200 and the second clamping structure 300 are fixed to the chuck. When assembling the shaft 400, the clamping device 100 only needs to simultaneously insert the shaft 400 into the first fixing hole 210 and the second fixing hole 310 to complete the positioning and clamping of the shaft 400. This simplifies the operation steps of assembling the shaft 400 using the clamping device 100, thus improving the ease of use of the clamping device 100.

[0024] According to the first aspect of the invention, the clamping device 100 has the advantages of reducing the number of parts, facilitating the production and manufacturing of the clamping device 100, reducing the production and manufacturing cost of the clamping device 100, improving the machining accuracy of the inner hole of the shaft 400, improving the machining efficiency of the shaft 400, and enhancing the ease of use of the clamping device 100.

[0025] According to some embodiments of the present invention, such as Figure 2 As shown, the first clamping structure 200 includes a structural body 220 and a mounting part 230. The structural body 220 is annular to define a first fixing hole 210. The mounting part 230 and the structural body 220 are fixedly connected and used to fix to the chuck.

[0026] As an example, the mounting part 230 can be welded to the chuck. As another example, the mounting part 230 can be provided with at least one mounting hole 231. A bolt is passed through the mounting hole 231 and fixed to the chuck, thereby fixing the mounting part 230 to the chuck, and thus fixing the first clamping structure 200 to the chuck. Each mounting part 230 can have one, two, three, or other mounting holes 231. This application uses a mounting part 230 with one mounting hole 231 as an example for illustration. In an illustrative embodiment, a bolt can be passed through the mounting hole 231 of the mounting part 230 and tightened into the positioning hole of the chuck to achieve the effect of fixing the mounting part 230 to the chuck.

[0027] As an example, there are multiple mounting parts 230. As another example, there is only one mounting part 230. This application will describe the case with multiple mounting parts 230 as an example. As one embodiment, the mounting part 230 and the structural body 220 are integrally formed. As another embodiment, the mounting part 230 and the structural body 220 are fixedly connected by welding. As another embodiment, the mounting part 230 and the structural body 220 are fixedly connected by fasteners such as bolts and clips.

[0028] The structural body 220 is annular, allowing the first fixing hole 210 formed at the center of the structural body 220 to precisely fit with the outer circle of the bearing platform of the shaft 400, which facilitates radial positioning of the non-machined end of the shaft 400. Fixing the structural body 220 to the chuck via the mounting part 230 reduces the risk of displacement or wobbling of the structural body 220 during grinding, ensuring the positioning accuracy of the shaft 400 during grinding and increasing the clamping speed of the shaft 400. The fixed connection between the mounting part 230 and the structural body 220 further reduces the risk of misalignment of the structural body 220 relative to the chuck, thereby improving the reliability of the fixture device 100.

[0029] According to some embodiments of the present invention, there are multiple mounting portions 230, and the multiple mounting portions 230 are arranged sequentially along the circumference of the structural body 220.

[0030] In one embodiment, multiple mounting portions 230 are arranged sequentially along the circumference of the structural body 220, with no gap between adjacent mounting portions 230. In another embodiment, multiple mounting portions 230 are arranged sequentially along the circumference of the structural body 220, with gaps between adjacent mounting portions 230. The arrangement of multiple mounting portions 230 along the circumference of the structural body 220 allows the multiple mounting portions 230 to fix the structural body 220 to the chuck from multiple directions, which helps improve the connection stability between the structural body 220 and the chuck. This reduces the risk of positional displacement of the first fixture structure 200 during the machining of the shaft 400, and also helps to ensure uniform circumferential stress on the structural body 220, reducing the risk of localized stress concentration in the structural body 220.

[0031] High-frequency vibrations are generated during the grinding of shaft 400. Multiple mounting parts 230 are arranged circumferentially along the structure body 220, which can limit the circumferential vibration degree of freedom of the structure body 220, thereby controlling the vibration amplitude to a smaller range. This helps to reduce the risk of vibration being transmitted to shaft 400 and causing fluctuations in the inner hole size of shaft 400, and helps to ensure the machining stability of the inner hole size of shaft 400.

[0032] According to some embodiments of the present invention, such as Figure 2 As shown, a first buffer layer 211 is formed on the inner sidewall of the first fixing hole 210. The first buffer layer 211 is annular and extends circumferentially along the first fixing hole 210.

[0033] The first buffer layer 211 can be made of elastic materials such as nitrile rubber or silicone rubber. In an exemplary embodiment, the annular structure of the first buffer layer 211 can be perfectly adapted to the annular structure of the first fixing hole 210. The first buffer layer 211 can separate the shaft 400 from the metal hole wall of the first fixing hole 210, which helps reduce the risk of scratches or indentations on the surface of the shaft 400 during clamping due to direct contact between the shaft 400 and the hole wall of the first fixing hole 210, thereby protecting the surface accuracy of the bearing seat of the shaft 400. The annular first buffer layer 211 can compensate for the gap between the shaft 400 and the first fixing hole 210 through its own elastic deformation, thereby facilitating a tight fit between the first buffer layer 211 and the outer circle of the shaft 400, thus facilitating complete clamping of the shaft 400 by the clamping device 100, thereby reducing the vibration phenomenon of the shaft 400 during the grinding process, and ensuring the machining accuracy of the inner hole of the shaft 400. The inner bore of shaft 400 is mostly machined using wet machining. Cutting fluid will enter the gap between the first fixing hole 210 and shaft 400. The first buffer layer 211 is annular and extends circumferentially along the first fixing hole 210. This helps reduce direct contact between the cutting fluid and the metal wall of the first fixing hole 210, reducing the risk of cutting fluid corrosion of the clamping device 100 and extending its service life. The material friction coefficient of the first buffer layer 211 is lower than that of the metal wall of the first fixing hole 210, reducing frictional resistance when shaft 400 enters the clamping device 100, making clamping operations smoother and improving clamping efficiency.

[0034] According to some embodiments of the present invention, such as Figure 1 , Figure 2 As shown, the second clamping structure 300 includes: a clamping sleeve 320, which is annular to define a second fixing hole 310.

[0035] The clamping sleeve 320 has an annular structure, which allows the second fixing hole 310 to fit snugly against the outer circle of the bearing platform of the shaft 400, thus ensuring the clamping stability of the second fixture structure 300. The second fixing hole 310 of the annular clamping sleeve 320 can be coaxial with the clamping sleeve 320 and coaxial with the first fixing hole 210, constraining the radial displacement of the shaft 400. This helps improve the positioning coaxiality of the shaft 400, thereby reducing the vibration phenomenon during the grinding process of the shaft 400.

[0036] According to some embodiments of the present invention, a second buffer layer 311 is formed on the inner wall of the second fixing hole 310. The second buffer layer 311 is annular and extends circumferentially along the second fixing hole 310. The second buffer layer 311 can further ensure a tight fit between the second clamping structure 300 and the shaft 400, avoiding the risk of positional displacement of the shaft 400 during machining, which is beneficial to ensuring the machining accuracy of the inner hole of the shaft 400, and also helps to reduce the risk of scratches on the surface of the shaft 400 caused by direct contact between the shaft 400 and the metal hole wall of the second fixing hole 310.

[0037] According to some embodiments of the present invention, such as Figure 1 , Figure 2 As shown, the clamping sleeve 320 includes a plurality of sub-clamping sleeves 321 and a plurality of flexible connecting parts 322. The plurality of sub-clamping sleeves 321 are arranged sequentially along the circumference of the clamping sleeve 320. Along the circumference of the clamping sleeve 320, any two adjacent sub-clamping sleeves 321 are connected by the flexible connecting parts 322 so that the sub-clamping sleeves 321 are movable in the radial direction of the clamping sleeve 320.

[0038] The sub-clamping sleeves 321 can be in the form of two or three, and the flexible connecting parts 322 can also be in the form of two or three. This embodiment uses three sub-clamping sleeves 321 and three flexible connecting parts 322 as an example. The sub-clamping sleeves 321 can be made of materials such as alloy steel or aluminum alloy, and can be forged and milled from alloy steel. The flexible connecting parts 322 can be made of elastic materials such as nitrile rubber or silicone rubber.

[0039] Adjacent sub-clamping sleeves 321 are connected by a flexible connecting part 322. The flexible connecting part 322 can deform and does not restrict the independent radial movement of the sub-clamping sleeves 321. This allows each sub-clamping sleeve 321 to adjust its radial position individually, thereby ensuring a tight fit between the clamping device 100 and the surface of the shaft 400 to accommodate shafts 400 with different diameter deviations. High-frequency vibrations are generated when the shaft 400 is ground. The flexible connecting part 322 can absorb some of the vibration energy through its own elastic deformation, thus reducing the transmission of vibration to the sub-clamping sleeves 321 and the shaft 400, and consequently reducing the impact of grinding vibration on the machining of the shaft 400.

[0040] Any two adjacent sub-clamping sleeves 321 are connected by a flexible connector 322. As an example, both the sub-clamping sleeves 321 and the flexible connector 322 are independent components. If one sub-clamping sleeve 321 wears out, only the corresponding sub-clamping sleeve 321 needs to be disassembled; there is no need to replace other sub-clamping sleeves 321 or the flexible connector 322, which helps reduce the maintenance cost of the clamping device 100. The flexible connector 322 can constrain adjacent sub-clamping sleeves 321 in the circumferential direction of the clamping sleeve 320, allowing all sub-clamping sleeves 321 to be arranged circumferentially. This ensures that the clamping sleeve 320 is annular after the clamping device 100 is assembled, which helps improve the structural integrity of the clamping sleeve 320 and reduces the risk of positioning deviation of the shaft 400 caused by misalignment of the sub-clamping sleeves 321.

[0041] According to some embodiments of the present invention, such as Figure 1 , Figure 2 As shown, the second clamping structure 300 further includes: a plurality of driving parts 330, which are located on the radial outer side of the clamping sleeve 320 and are arranged sequentially along the circumference of the clamping sleeve 320. The plurality of driving parts 330 are all mounted on the chuck. The plurality of driving parts 330 and the plurality of sub-clamping sleeves 321 are fixedly connected in a one-to-one correspondence. The driving parts 330 are used to drive the corresponding sub-clamping sleeves 321 to move radially along the clamping sleeve 320.

[0042] The drive unit 330 can be in the form of two or three, and this embodiment uses three drive units 330 as an example. The drive unit 330 can be made of metal materials such as alloy steel or aluminum alloy. As one embodiment, the drive unit 330 can have a mounting hole 333 extending along a first direction. By assembling bolts or other fasteners through the mounting hole 333 and the corresponding positioning hole provided on the chuck, the drive unit 330 is mounted on the chuck. As another embodiment, the drive unit 330 can be welded to the chuck. As an example, the drive unit 330 and the sub-clamping sleeve 321 can be integrally formed. As another embodiment, the drive unit 330 and the sub-clamping sleeve 321 can be fixedly connected by fasteners such as bolts and clips. As another embodiment, the drive unit 330 can be welded to the sub-clamping sleeve 321.

[0043] As one embodiment, the drive unit 330 has an assembly end 334 for assembling with a chuck. The assembly end 334 has a groove 335 that extends radially along the clamping sleeve 320. The groove 335 is used for assembling with the chuck. By moving the drive unit 330 radially along the clamping sleeve 320, the corresponding sub-clamping sleeve 321 is moved synchronously, achieving the effect of the drive unit 330 driving the corresponding sub-clamping sleeve 321 to move radially along the clamping sleeve 320. As another embodiment, the drive unit 330 is fixed to the chuck. The drive unit 330 is a drive cylinder with a telescopic rod. The telescopic rod is fixed to the corresponding sub-clamping sleeve 321. By extending and retracting the telescopic rod, the corresponding sub-clamping sleeve 321 is driven to move radially along the clamping sleeve 320.

[0044] In another embodiment, a guide rail can be installed on the end face of the chuck. The guide rail passes radially through the groove 335 along the clamping sleeve 320. The guide rail can guide the movement of the drive unit 330, allowing the drive unit 330 to move smoothly radially along the clamping sleeve 320. In another embodiment, the drive unit 330 is fixed to the chuck and includes a drive motor, a transmission assembly, and a telescopic rod. The telescopic rod is fixed to the corresponding sub-clamping sleeve 321. After the drive motor is started, the power is transmitted to the telescopic rod through the transmission assembly, causing the telescopic rod to extend and retract radially along the clamping sleeve 320. This, in turn, drives the corresponding sub-clamping sleeve 321 to move synchronously radially along the clamping sleeve 320, thereby adjusting the inner diameter of the second fixing hole 310 to accommodate shafts 400 of different diameters.

[0045] The drive unit 330 is configured in a one-to-one correspondence with the sub-clamping sleeve 321, allowing multiple drive units 330 to apply independently controllable radial driving force to multiple sub-clamping sleeves 321. By adjusting the radial travel of the sub-clamping sleeve 321, the drive unit 330 can push the sub-clamping sleeve 321 to radially expand or shrink the inner diameter of the second fixing hole 310, so that the clamping device 100 can be adapted to shafts 400 of different diameter specifications, thereby improving the versatility of the clamping device 100.

[0046] According to some embodiments of the present invention, such as Figure 1 , Figure 2 As shown, each drive unit 330 is movably mounted on the chuck along the radial direction of the clamping sleeve 320 to drive the corresponding sub-clamping sleeve 321 to move.

[0047] In one embodiment, the first body 331 has a mounting hole 333 extending in a first direction for fasteners to pass through. The first body 331 also has a mounting end 334 for assembling with a chuck. The mounting end 334 has a groove 335 extending radially along the clamping sleeve 320 and is used for assembling with the chuck. Multiple radial guide rails can be evenly arranged along the circumference of the clamping sleeve 320 on the end face of the chuck. These guide rails pass through the corresponding grooves 335 radially along the clamping sleeve 320. The engagement of the guide rails and grooves 335 allows the drive unit 330 to be movably mounted on the chuck radially along the clamping sleeve 320.

[0048] The drive unit 330 moves radially along the clamping sleeve 320, which in turn drives the corresponding sub-clamping sleeve 321 to move radially. This allows adjustment of the radial position of the sub-clamping sleeve 321, changing the inner diameter of the second fixing hole 310 so that the clamping device 100 can accommodate shafts 400 of different diameters, thus improving the versatility of the clamping device 100. When the sub-clamping sleeve 321 is machined or assembled with the chuck, there may be slight coaxiality deviations. The radial movement of the drive unit 330, which drives the sub-clamping sleeve 321 to move radially, allows for fine-tuning of the radial position of the sub-clamping sleeve 321 and correction of coaxiality deviations.

[0049] According to some embodiments of the present invention, such as Figure 1 , Figure 2 As shown, the drive unit 330 includes: a first body 331 and a second body 332. The first body 331 and the corresponding sub-clamping sleeve 321 are arranged radially spaced apart along the clamping sleeve 320, and the first body 331 extends along a first direction. The second body 332 is connected between the first body 331 and the corresponding sub-clamping sleeve 321.

[0050] The first body 331 extends along a first direction, and the first body 331 and the sub-clamping sleeve 321 are arranged radially at intervals. The second body 332 connects the first body 331 and the corresponding sub-clamping sleeve 321. This optimizes the spatial layout of the clamping device 100, reduces the risk of radial space conflicts between the first body 331, the clamping sleeve 320, and the shaft 400, and allows the radial driving force of the drive unit 330 to be directly transmitted to the sub-clamping sleeve 321 through the second body 332, reducing the transmission links and losses of the driving force. The drive unit 330 needs to transmit radial driving force to the sub-clamping sleeve 321 to clamp the shaft 400. The second body 332 connects the first body 331 and the corresponding sub-clamping sleeve 321, which reduces the connection gap between the first body 331 and the corresponding sub-clamping sleeve 321, and improves the connection stability between the drive unit 330 and the sub-clamping sleeve 321.

[0051] According to some embodiments of the present invention, such as Figure 1 , Figure 2As shown, the first body 331 has an assembly hole 333 extending in a first direction for fasteners to pass through; and / or the first body 331 has an assembly end 334 for assembling with a chuck, the assembly end 334 having a groove 335 extending radially along the clamping sleeve 320 for assembling with a chuck.

[0052] As one example, the first body 331 has a mounting hole 333 extending in a first direction for fasteners to pass through. As another example, the first body 331 has a mounting end 334 for assembling with a chuck, the mounting end 334 having a groove 335 extending radially along the clamping sleeve 320 for assembling with the chuck. As yet another embodiment, the first body 331 has a mounting hole 333 extending in a first direction for fasteners to pass through, and the first body 331 has a mounting end 334 for assembling with a chuck, the mounting end 334 having a groove 335 extending radially along the clamping sleeve 320 for assembling with the chuck. This application describes an example where the first body 331 has a mounting hole 333 and a mounting end 334.

[0053] Bolts, screws, and other fasteners pass through mounting holes 333 and are fitted into positioning holes on the chuck, allowing the first body 331 to be mounted on the chuck. This enables the fasteners to resist the axial and radial forces generated during the grinding of the shaft 400, reducing the risk of displacement of the drive unit 330 due to vibration during shaft 400 grinding and improving the connection stability between the fixture device 100 and the chuck. The fasteners and mounting holes 333 enable a detachable connection between the fixture device 100 and the chuck. When the drive unit 330 needs to be installed, repaired, replaced, or its position adjusted, simply loosening / tightening the fasteners is sufficient to disassemble and install the drive unit 330, reducing the difficulty of disassembling and installing the fixture device 100.

[0054] When the diameter of the shaft 400 changes, there is no need to replace the drive unit 330. The clamping position of the sub-clamping sleeve 321 can be adjusted simply by driving the corresponding sub-clamping sleeve 321 to move through the drive unit 330. This allows the clamping device 100 to stably clamp shafts 400 of more specifications, which is more conducive to improving the versatility of the clamping device 100.

[0055] Other configurations and operations of the clamping device 100 for grinding the inner hole of shaft 400 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0056] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0057] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A fixture device for grinding an inner hole of a shaft, characterized by, The utility model relates to a first clamp structure (200) for fixing on a chuck, the first clamp structure (200) defines a first fixed hole (210) for assembling a shaft (400), a second clamp structure (300) for mounting on the chuck, the second clamp structure (300) defines a second fixed hole (310) for assembling the shaft (400), the first fixed hole (210) and the second fixed hole (310) are opposite and spaced apart along a first direction, and the first fixed hole (210) and the second fixed hole (310) can simultaneously assemble the shaft (400). The first clamp structure (200) includes a structure body (220) and a mounting portion (230), the structure body (220) is annular to define the first fixed hole (210), and the mounting portion (230) is fixedly connected with the structure body (220) and is used for fixing on a chuck. The mounting portion (230) is annular and extends along the circumference of the first fixed hole (210).

2. The fixture apparatus for grinding an inner hole of a shaft according to claim 1, wherein The second clamp structure (300) includes a clamping sleeve (320), and the clamping sleeve (320) is annular to define the second fixed hole (310).

3. The fixture apparatus for grinding an inner hole of a shaft according to claim 2, wherein The clamping sleeve (320) includes a plurality of sub-clamping sleeves (321) and a plurality of flexible connecting portions (322), the plurality of sub-clamping sleeves (321) are sequentially arranged along the circumference of the clamping sleeve (320), and any two adjacent sub-clamping sleeves (321) are connected by the flexible connecting portion (322) along the circumference of the clamping sleeve (320), so that the sub-clamping sleeve (321) is movable along the radial direction of the clamping sleeve (320).

4. The fixture apparatus for grinding an inner hole of a shaft according to claim 1, wherein The second clamp structure (300) further includes a plurality of driving portions (330), the plurality of driving portions (330) are located on the radial outer side of the clamping sleeve (320), and the plurality of driving portions (330) are sequentially arranged along the circumference of the clamping sleeve (320), the plurality of driving portions (330) are mounted on a chuck, the plurality of driving portions (330) and the plurality of sub-clamping sleeves (321) are fixedly connected in one-to-one correspondence, and the driving portion (330) is used for driving the corresponding sub-clamping sleeve (321) to move along the radial direction of the clamping sleeve (320).

5. A fixture device for grinding an inner hole of a shaft according to any one of claims 1 to 4, characterized in that, Each driving portion (330) is movably mounted on the chuck along the radial direction of the clamping sleeve (320) to drive the corresponding sub-clamping sleeve (321) to move.

6. The fixture apparatus for grinding an inner hole of a shaft according to claim 5, wherein ​ 7. The fixture apparatus for grinding an inner hole of a shaft according to claim 6, wherein ​ 8. The fixture apparatus for grinding an inner hole of a shaft according to claim 7, wherein ​ 9. The fixture apparatus for grinding an inner hole of a shaft according to claim 7, wherein The driving part (330) comprises a first body (331) and a second body (332), the first body (331) and the corresponding sub-gripping sleeve (321) are arranged radially apart from each other along the gripping sleeve (320), and the first body (331) extends along the first direction, and the second body (332) is connected between the first body (331) and the corresponding sub-gripping sleeve (321).

10. The fixture apparatus for grinding an inner hole of a shaft according to claim 9, wherein The first body (331) is formed with an assembly hole (333) extending along the first direction, and the assembly hole (333) is used for passing through a fastener; and / or The first body (331) has an assembly end (334) for cooperating with the chuck, and the assembly end (334) is formed with a sliding groove (335) extending along the radial direction of the gripping sleeve (320), and the sliding groove (335) is used for cooperating with the chuck.

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