Cylinder shaft inner wall grinding device and cylinder shaft production line

Abstract

The invention provides a barrel shaft inner wall grinding device and a barrel shaft production line, and belongs to the field of machining, and the barrel shaft inner wall grinding device is composed of a grinding head and a reducing assembly. The multiple polishing heads are evenly arranged in a radial shape around a first axis coaxial with the to-be-polished barrel shaft. The reducing assembly comprises a fixing disc, a mounting piece and a control piece. The rotation axis of the fixed disc is coaxial with the first axis. And one ends of the mounting pieces are provided with the polishing heads, and the other ends of the mounting pieces are radially inserted into the peripheral surface of the fixed disc along the fixed disc. An axial guide structure is arranged at one end, in the fixing disc, of the mounting piece, a matched radial avoiding hole is formed in the shaft end face of the fixing disc, and the guide structure is through and provided with a protruding part. A control disc of the control piece is coaxially arranged at the shaft end of the fixed disc, an arc-shaped guide hole matched with the protruding part is formed in the control disc, and when the control disc and the fixed disc rotate relatively, the grinding heads get close to or get away from each other. Compared with the prior art, the technical problem that the outer diameter of an existing grinding wheel cannot be adjusted is solved.

Description

Technical Field

[0001] The present invention belongs to the field of mechanical processing, and more specifically, relates to a cylindrical shaft inner wall grinding device. The present invention also relates to a cylindrical shaft production line, which is provided with the cylindrical shaft inner wall grinding device. Background Art

[0002] A grinder is a machine tool that uses abrasive tools to grind the surface of a workpiece. Most grinders use high-speed rotating grinding wheels for grinding, while a few use other grinding tools such as oilstones, abrasive belts, and free abrasives for processing, such as honing machines, superfinishing machines, belt grinders, grinders, and polishers.

[0003] With the increase in the number of high-precision, high-hardness mechanical parts, and the development of precision casting and precision forging technology, the performance, variety and output of grinding machines are constantly improving and growing. (1) External cylindrical grinding machine: a grinding machine mainly used for grinding cylindrical and conical outer surfaces. (2) Internal cylindrical grinding machine: a grinding machine mainly used for grinding cylindrical and conical inner surfaces. In addition, there are also grinding machines that can perform both internal and external cylindrical grinding.

[0004] Among them, the working principle of the internal cylindrical grinder is to grind the inner hole surface of the workpiece through a high-speed rotating grinding wheel. The workpiece is usually installed on the workbench and driven by the workbench to do circular feed motion; the grinding wheel is installed on the grinding wheel shaft and performs the main motion of high-speed rotation. At the same time, the grinding wheel can also make longitudinal feed motion along the axis direction of the inner hole of the workpiece, and make lateral feed motion in the direction perpendicular to the axis direction of the inner hole of the workpiece, so as to realize the grinding of the inner hole of the workpiece. Structurally, the existing internal cylindrical grinder mainly includes a bed, a workbench, a grinding wheel frame, a headstock and a tailstock, among which the bed is the basic component of the internal cylindrical grinder, which is used to support and install other components to ensure the relative position accuracy between the components. The workbench is used to install the workpiece and drive the workpiece to do circular feed motion and longitudinal feed motion. The motion accuracy of the workbench directly affects the processing accuracy of the workpiece. The grinding wheel frame is used to install the grinding wheel spindle and the grinding wheel, so that the grinding wheel performs the main motion of high-speed rotation. The grinding wheel frame can make lateral feed motion in the direction perpendicular to the axis direction of the inner hole of the workpiece to control the grinding depth. The headstock is used to mount the workpiece and drive the workpiece to do circular feed motion. The spindle accuracy and rotation stability of the headstock have an important influence on the machining accuracy of the workpiece. The tailstock is used in conjunction with the headstock to support the other end of the workpiece to ensure the installation accuracy and stability of the workpiece.

[0005] However, in the process of machining high-hardness metal (such as tungsten-molybdenum alloy) cylindrical shafts, the existing internal cylindrical grinders are difficult to process. The grinding wheel is easily affected by radial force during the processing, which affects the processing accuracy. In addition, facing the different diameters of the cylindrical shaft, the processing versatility of the existing grinding wheels cannot meet the needs and is in urgent need of improvement. Summary of the invention

[0006] The purpose of the present invention is to provide a cylindrical shaft inner wall grinding device to solve the technical problems that the existing grinding wheel is easily affected by radial force during the processing process and the existing grinding wheel has poor versatility when processing a cylindrical shaft with a variable inner diameter.

[0007] To achieve the above object, the technical solution adopted by the present invention is: to provide a cylindrical shaft inner wall grinding device, comprising:

[0008] A plurality of grinding heads, each of the grinding heads being evenly arranged radially around a first axis, the first axis being coaxial with the barrel axis to be ground;

[0009] A reducer assembly, including a fixing plate, a mounting part and a control part;

[0010] The rotation axis of the fixed disk is coaxial with the first axis, there are multiple mounting members, and the multiple mounting members correspond to the multiple grinding heads one by one. One end of the mounting member is used to mount the grinding head, and the other end is inserted into the outer peripheral surface of the fixed disk in a radially sliding manner along the fixed disk.

[0011] One end of the mounting member located in the fixed disk has a guide structure extending along the axial direction of the fixed disk, and the axial end surface of the fixed disk is provided with an avoidance hole slidably matched with the guide structure, the extension direction of the avoidance hole is parallel to the radial direction of the fixed disk, the guide structure passes through the avoidance hole, and the guide structure has a protruding portion protruding from the axial end surface of the fixed disk;

[0012] The control member includes a control plate coaxially arranged at the axial end of the fixed plate, the rotation axis of the control plate is coaxial with the fixed plate, the control plate has a locking state of synchronous movement with the fixed plate, and an adjustment state of coaxial rotation relative to the fixed plate, the control member has an arc-shaped guide hole opened with the fixed plate and slidably adapted to the protruding portion, and the major axis of the arc-shaped guide hole is set at an angle to any radial line of the fixed plate, and with the relative rotation of the control plate and the fixed plate, the grinding heads approach or move away from each other.

[0013] In a possible implementation, the cylindrical shaft inner wall grinding device also includes a first control shaft and a second control shaft, the first control shaft is coaxially connected to the fixed disk, the second control shaft is coaxially connected to the control disk, the second control shaft is sleeved on the outer periphery of the first control shaft, and the first control shaft and the second control shaft can rotate synchronously or relatively.

[0014] In a possible implementation, the fixing disk is provided with a guide hole, and the mounting member is slidably inserted into the guide hole along a radial line of the fixing disk.

[0015] In a possible implementation, a self-lubricating sealing ring is provided on a side of the control disk facing the fixed disk, the self-lubricating sealing ring is coaxial with the control disk, and the control disk is in sealing contact with the fixed disk via the self-lubricating sealing ring.

[0016] In a possible implementation, the cylindrical shaft inner wall grinding device also includes a support frame and a support assembly, the first control shaft and the second control shaft are rotatably arranged on the top of the support frame, the support assembly is movably arranged along the first axis on the top of the support frame, and includes at least one positioning fixture for fixing the cylindrical shaft to be ground, and the positioning fixture can clamp the cylindrical shaft to be ground along the radial direction of the cylindrical shaft.

[0017] In a possible implementation, the cylindrical shaft inner wall grinding device also includes a dust suction assembly, which includes a dust suction box and a vacuum cleaner, the dust suction box cover is arranged on the support frame, the fixed plate, the mounting part, the control part, the grinding head and the support assembly are all arranged in the dust suction box, and the negative pressure pipeline of the vacuum cleaner is connected to the dust suction box.

[0018] In a possible implementation, the cylindrical shaft inner wall grinding device also includes a driving screw that drives the positioning fixture to move along the first axis. The driving screw is arranged on the support frame and extends along the first axis. The bottom of the positioning fixture is provided with a first threaded hole that is adapted to the thread of the driving screw.

[0019] In a possible implementation, the support assembly further includes a support bracket, and along the first axis, the positioning fixture and the support bracket are arranged at intervals, and a second threaded hole adapted to the thread of the drive screw is provided at the bottom of the support bracket.

[0020] In a possible implementation, the cylindrical shaft inner wall grinding device further includes a driving assembly disposed on the support frame, and the driving assembly is used to drive the first control shaft and the second control shaft to rotate synchronously or relatively.

[0021] Compared with the prior art, the beneficial effects of the cylindrical shaft inner wall grinding device provided by the present invention are:

[0022] First, the present invention cooperates with each other through multiple grinding heads, fixed disks, mounting parts and control disks. When the control disk is in an adjustment state and rotates relative to the fixed disk, the arc-shaped guide hole cooperates with the protruding part, which will drive the mounting parts to slide radially along the fixed disk, thereby making each grinding head approach or move away from each other, thereby realizing the change of the overall outer diameter of the grinding wheel. According to the different grinding requirements of the inner wall of the cylindrical shaft, the outer diameter of the grinding wheel can be flexibly adjusted to adapt to the grinding of the inner wall of the cylindrical shaft with different inner diameters. For example, when grinding the inner wall of the cylindrical shaft with an inner diameter of 50mm, the outer diameter of the grinding wheel can be reduced to a suitable size for grinding by adjusting the control disk, and when the inner wall of this part of the cylindrical shaft needs to be ground to an inner diameter of 80mm, the outer diameter of the grinding wheel can be enlarged. This progressive grinding method can grind the inner wall of the barrel shaft more accurately, thereby improving the grinding accuracy and quality; it solves the technical problems that the existing traditional grinding wheels are difficult to adapt to barrel shafts of different inner diameters due to their fixed size, and may be subjected to large radial forces during grinding due to inappropriate size, thus affecting the grinding effect and the life of the grinding wheel. The grinding wheel of the device has a variable outer diameter, which can better fit the inner wall of the barrel shaft and reduce the generation of radial forces, thereby improving the grinding quality of the inner diameter of the barrel shaft and improving the service life and working accuracy of the entire grinding equipment.

[0023] Another object of the present invention is to provide a cylindrical shaft production line, comprising the cylindrical shaft inner wall grinding device mentioned above.

[0024] Compared with the prior art, the cylindrical shaft production line in the present invention has all the advantages of the above-mentioned cylindrical shaft inner wall grinding device, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the prior art description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0026] Figure 1 A schematic diagram of the overall structure of the cylindrical shaft inner wall grinding device provided by the present invention;

[0027] Figure 2 A schematic diagram of the structure of a diameter-changing assembly in a cylindrical shaft inner wall grinding device provided by the present invention;

[0028] Figure 3 A schematic diagram of the positional relationship between a fixed disk and a control member in the cylindrical shaft inner wall grinding device provided by the present invention.

[0029] In the figure:

[0030] 1. Grinding head;

[0031] 2. Variable diameter assembly, 21. Fixed plate; 211. Avoidance hole; 22. Mounting member; 221. Guide structure; 23. Control member; 231. Control plate; 2331. Arc guide hole;

[0032] 31. First control axis; 32. Second control axis;

[0033] 4. Support frame;

[0034] 5. Support assembly; 51. Positioning fixture; 52. Support bracket;

[0035] 6. dust collection component; 61. dust collection box; 62. vacuum cleaner;

[0036] 7. Drive the lead screw;

[0037] 8. Drive components. DETAILED DESCRIPTION

[0038] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0039] In the description of the present invention, it should be noted that if terms such as "upper", "lower", "inside" and "back" appear to indicate orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] In addition, in the description of the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connection", and "connector" should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or a connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in combination with specific circumstances.

[0041] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0042] Please also read Figures 1 to 3, the cylindrical shaft inner wall grinding device provided by the present invention is now described. In general, the cylindrical shaft inner wall grinding device grinds the inner wall of the cylindrical shaft by setting a grinding wheel with a variable outer diameter, and the rotation axis of the grinding wheel is coaxial with the cylindrical shaft. The claim aims to grind the inner wall of the cylindrical shaft progressively by changing the outer diameter of the grinding wheel, thereby solving the technical problems that the existing grinding wheel is not convenient for grinding inside the cylinder and will be subjected to radial force during the grinding process.

[0043] Based on the above design ideas, in a feasible implementation manner, the inner wall grinding device of the cylindrical shaft provided by the present invention includes a grinding head 1 and a reducing assembly 2, wherein there are multiple grinding heads 1, each grinding head 1 is evenly arranged radially around a first axis, and the first axis is coaxial with the cylindrical shaft to be ground; the reducing assembly 2 includes a fixed disk 21, a mounting member 22 and a control member 23; wherein the rotation axis of the fixed disk 21 is coaxial with the first axis, there are multiple mounting members 22, and the multiple mounting members 22 correspond one-to-one to the multiple grinding heads 1, one end of the mounting member 22 is used to install the grinding head 1, and the other end is inserted into the outer peripheral surface of the fixed disk 21 along the radial direction of the fixed disk 21; the end of the mounting member 22 located in the fixed disk 21 has a guide structure 221 extending along the axial direction of the fixed disk 21, and the axial end surface of the fixed disk 21 is provided with a guide structure 221 sliding with the guide structure 221 The guide structure 221 passes through the avoidance hole 211, and the guide structure 221 has a protruding portion protruding from the axial end face of the fixed disk 21; the control member 23 includes a control disk 231 coaxially arranged at the axial end of the fixed disk 21, the rotation axis of the control disk 231 is coaxial with the fixed disk 21, the control disk 231 has a locking state of synchronous movement with the fixed disk 21, and an adjustment state of coaxial rotation relative to the fixed disk 21, the control member 23 has an arc-shaped guide hole 2331 opened with the fixed disk 21 and slidably adapted to the protruding portion, and the major axis of the arc-shaped guide hole 2331 is set at an angle with any radial line of the fixed disk 21, and with the relative rotation of the control disk 231 and the fixed disk 21, each grinding head 1 approaches or moves away from each other.

[0044] Compared with the prior art, in the specific implementation process of the present invention, firstly, in this embodiment, multiple grinding heads 1, fixed disk 21, mounting member 22 and control disk 231 cooperate with each other. When the control disk 231 is in the adjustment state and rotates relative to the fixed disk 21, the arc-shaped guide hole 2331 cooperates with the protruding part, which will drive the mounting member 22 to slide radially along the fixed disk 21, thereby making each grinding head 1 close to or away from each other, so as to realize the change of the overall outer diameter of the grinding wheel composed of each grinding head 1. According to the different grinding requirements of the inner wall of the cylindrical shaft, the outer diameter of the grinding wheel can be flexibly adjusted, so as to adapt to the grinding of the inner wall of the cylindrical shaft with multiple inner diameter sizes. For example, when grinding the inner wall of the cylindrical shaft with an inner diameter of 50mm, by adjusting the control disk 231, the outer diameter of the grinding wheel can be reduced to a suitable size for grinding, and when the inner wall of this part of the cylindrical shaft needs to be ground with an inner diameter of 80mm, the outer diameter of the grinding wheel can be enlarged. This progressive grinding method can grind the inner wall of the barrel shaft more accurately, thereby improving the grinding accuracy and quality; it solves the technical problems that the existing traditional grinding wheels are difficult to adapt to barrel shafts of different inner diameters due to their fixed size, and may be subjected to large radial forces during grinding due to inappropriate size, thus affecting the grinding effect and the life of the grinding wheel. The grinding wheel of the device has a variable outer diameter, which can better fit the inner wall of the barrel shaft and reduce the generation of radial forces, thereby improving the grinding quality of the inner diameter of the barrel shaft and improving the service life and working accuracy of the entire grinding equipment.

[0045] Based on the above embodiments, in some feasible implementation schemes, the cylindrical shaft inner wall grinding device also includes a first control shaft 31 and a second control shaft 32, the first control shaft 31 is coaxially connected to the fixed disk 21, the second control shaft 32 is coaxially connected to the control disk 231, the second control shaft 32 is sleeved on the outer periphery of the first control shaft 31, and the first control shaft 31 and the second control shaft 32 can rotate synchronously or relatively, so as to control the rotation of the fixed disk 21 and the control disk 231 respectively through the two control shafts, so as to change the relative positions of each grinding head 1.

[0046] In some feasible embodiments, the fixed disk 21 is provided with a guide hole, and the mounting member 22 is slidably inserted into the guide hole along the radial line of the fixed disk 21. The above structure can make the sliding of the mounting member 22 on the fixed disk 21 more stable and accurate. The guide hole provides a clear sliding guide path for the mounting member 22, so that the mounting member 22 can move strictly in the radial direction when moving radially along the fixed disk 21, avoiding the deviation or shaking of the mounting member 22 during the movement. In the process of adjusting the outer diameter of the grinding wheel from 60mm to 70mm, due to the effect of the guide hole, the mounting member 22 can accurately move along the radial line, so that the grinding head 1 is evenly expanded outward, ensuring the accuracy of the adjustment of the outer diameter of the grinding wheel, thereby improving the accuracy of grinding. Compared with the structure without a guide hole, the problem of unstable sliding of the mounting member 22, resulting in inaccurate adjustment of the outer diameter of the grinding wheel, and affecting the grinding effect is solved, making the grinding process more reliable.

[0047] In some feasible embodiments, a self-lubricating sealing ring is provided on one side of the control disk 231 facing the fixed disk 21, and the self-lubricating sealing ring is coaxial with the control disk 231, and the control disk 231 is sealed against the fixed disk 21 through the self-lubricating sealing ring. The above structure can make the connection between the control disk 231 and the fixed disk 21 tighter and more stable, while reducing friction. The self-lubricating sealing ring can provide a good lubrication effect when the control disk 231 and the fixed disk 21 rotate relative to each other, reduce the friction between the two, and reduce wear. In addition, the sealing effect of the self-lubricating sealing ring can prevent external dust, impurities, etc. from entering the gap between the control disk 231 and the fixed disk 21, thereby ensuring the cleanliness of the inside of the device and extending the service life of the device.

[0048] In some feasible embodiments, the cylindrical shaft inner wall grinding device also includes a support frame 4 and a support assembly 5, the first control shaft 31 and the second control shaft 32 are rotatably arranged on the top of the support frame 4, the support assembly 5 is movably arranged on the top of the support frame 4 along the first axis, and includes at least one positioning fixture 51 for fixing the cylindrical shaft to be ground, and the positioning fixture 51 can clamp the cylindrical shaft to be ground along the radial direction of the cylindrical shaft. Such an arrangement makes the installation and fixation of the entire grinding device more stable, and at the same time facilitates the positioning and fixation of the cylindrical shaft. The support frame 4 provides a stable support foundation for the first control shaft 31, the second control shaft 32 and the support assembly 5, ensuring the stability of the device during the grinding process. The movability of the support assembly 5 makes it possible to adjust according to the length and position of the cylindrical shaft, and the positioning fixture 51 can accurately clamp the cylindrical shaft along the radial direction of the cylindrical shaft to ensure that the cylindrical shaft will not be displaced during the grinding process.

[0049] In addition to the above feasible embodiments, in some feasible embodiments, in order to keep the processing environment clean, the inner wall grinding device of the cylindrical shaft also includes a dust collection component 6, and the dust collection component 6 includes a dust collection box 61 and a dust collector 62. The dust collection box 61 is covered on the support frame 4, and the fixed plate 21, the mounting part 22, the control part 23, the grinding head 1 and the support assembly 5 are all arranged in the dust collection box 61. The negative pressure pipeline of the dust collector 62 is connected to the dust collection box 61. The dust generated during the grinding process is collected in a timely and effective manner to keep the working environment clean. The dust collection box 61 covers the main components of the grinding device to form a relatively closed space. The dust collector 62 sucks the dust in the dust collection box 61 through the negative pressure pipeline to prevent the dust from spreading to the surrounding environment.

[0050] In some feasible embodiments, the cylindrical shaft inner wall grinding device further includes a driving screw 7 that drives the positioning fixture 51 to move along the first axis. The driving screw 7 is disposed on the support frame 4 and extends along the first axis. The bottom of the positioning fixture 51 is provided with a first threaded hole that is threadably matched with the driving screw 7. This arrangement enables the positioning fixture 51 to move precisely along the first axis, facilitating the grinding of different positions of the cylindrical shaft. The rotation of the driving screw 7 can drive the positioning fixture 51 to move along its axial direction. By precisely controlling the number of rotations of the driving screw 7, the position of the positioning fixture 51 can be accurately adjusted.

[0051] Based on the above embodiment, further, the support assembly 5 also includes a support bracket 52. Along the first axis, the positioning fixture 51 and the support bracket 52 are arranged at intervals, and a second threaded hole adapted to the thread of the driving screw 7 is provided at the bottom of the support bracket 52, so as to further enhance the support stability of the cylindrical shaft by threading the driving screw 7 and the second threaded hole, and cooperate with the positioning fixture 51 to better adapt to cylindrical shafts of different lengths and weights. The support bracket 52 and the positioning fixture 51 are arranged at intervals, and can provide support at different positions of the cylindrical shaft, disperse the weight of the cylindrical shaft, and reduce the deformation of the cylindrical shaft during the grinding process. The second threaded hole at the bottom of the support bracket 52 cooperates with the driving screw 7, so that the support bracket 52 can also move along the first axis, which is convenient for adjustment according to the length of the cylindrical shaft.

[0052] In a possible implementation, the cylindrical shaft inner wall grinding device further includes a driving assembly 8 disposed on the support frame 4, and the driving assembly 8 is used to drive the first control shaft 31 and the second control shaft 32 to rotate synchronously or relatively. The above structure can provide power for the rotation of the first control shaft 31 and the second control shaft 32, and realize automatic control of the rotation and outer diameter adjustment of the grinding head 1. The driving assembly 8 can accurately control the rotation state of the first control shaft 31 and the second control shaft 32 according to different grinding requirements, thereby improving the efficiency and accuracy of grinding.

[0053] Based on the same inventive concept, the present invention also proposes a cylindrical shaft production line, which includes the cylindrical shaft inner wall grinding device mentioned above.

[0054] Compared with the prior art, the cylindrical shaft production line in the present invention has all the advantages of the cylindrical shaft inner wall grinding device, which will not be described here. In addition, the present invention can apply the cylindrical shaft inner wall grinding device to the cylindrical shaft production line, and cooperate with other production equipment to realize the automation and efficiency of cylindrical shaft production. As an important part of the production line, the cylindrical shaft inner wall grinding device can grind the inner wall of the cylindrical shaft with high quality and improve the production quality of the cylindrical shaft.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cylindrical shaft inner wall grinding device, characterized in that: include: A plurality of grinding heads (1), each of the grinding heads (1) being evenly arranged radially around a first axis, the first axis being coaxial with the cylindrical axis to be ground; A diameter reducing assembly (2) comprising a fixing plate (21), a mounting member (22) and a control member (23); The rotation axis of the fixed disk (21) is coaxial with the first axis, there are a plurality of mounting members (22), the plurality of mounting members (22) correspond one to one with the plurality of grinding heads (1), one end of the mounting member (22) is used to mount the grinding head (1), and the other end is inserted into the outer peripheral surface of the fixed disk (21) in a radially sliding manner along the fixed disk (21); One end of the mounting member (22) located inside the fixed disk (21) has a guide structure (221) extending along the axial direction of the fixed disk (21); an axial end surface of the fixed disk (21) is provided with an avoidance hole (211) slidably matched with the guide structure (221); the extension direction of the avoidance hole (211) is parallel to the radial direction of the fixed disk (21); the guide structure (221) passes through the avoidance hole (211), and the guide structure (221) has a protruding portion protruding from the axial end surface of the fixed disk (21); The control member (23) comprises a control plate (231) coaxially arranged at the axial end of the fixed plate (21); the rotation axis of the control plate (231) is coaxial with the fixed plate (21); the control plate (231) has a locking state in which it moves synchronously with the fixed plate (21), and an adjustment state in which it rotates coaxially relative to the fixed plate (21); the control member (23) has an arc-shaped guide hole (2331) opened with the fixed plate (21) and adapted to slide with the protruding portion; and the major axis of the arc-shaped guide hole (2331) is arranged at an angle with any radial line of the fixed plate (21); and as the control plate (231) and the fixed plate (21) rotate relative to each other, the grinding heads (1) move closer to or farther from each other.

2. The cylindrical shaft inner wall grinding device according to claim 1, characterized in that: The cylindrical shaft inner wall grinding device also includes a first control shaft (31) and a second control shaft (32), wherein the first control shaft (31) is coaxially connected to the fixed disk (21), and the second control shaft (32) is coaxially connected to the control disk (231), and the second control shaft (32) is sleeved on the outer periphery of the first control shaft (31), and the first control shaft (31) and the second control shaft (32) can rotate synchronously or relatively.

3. The cylindrical shaft inner wall grinding device according to claim 2, characterized in that: The fixing plate (21) is provided with a guide hole, and the mounting member (22) is slidably inserted into the guide hole along a radial line of the fixing plate (21).

4. The cylindrical shaft inner wall grinding device according to claim 1, characterized in that: A self-lubricating sealing ring is provided on one side of the control disk (231) facing the fixed disk (21); the self-lubricating sealing ring is coaxial with the control disk (231); and the control disk (231) is in sealing contact with the fixed disk (21) via the self-lubricating sealing ring.

5. The cylindrical shaft inner wall grinding device according to claim 2, characterized in that: The cylindrical shaft inner wall grinding device also includes a support frame (4) and a support assembly (5), wherein the first control shaft (31) and the second control shaft (32) are rotatably arranged on the top of the support frame (4), and the support assembly (5) is movably arranged on the top of the support frame (4) along a first axis, and includes at least one positioning fixture (51) for fixing the cylindrical shaft to be ground, and the positioning fixture (51) can clamp the cylindrical shaft to be ground along the radial direction of the cylindrical shaft.

6. The cylindrical shaft inner wall grinding device according to claim 5, characterized in that: The cylindrical shaft inner wall grinding device also includes a dust collection assembly (6), the dust collection assembly (6) includes a dust collection box (61) and a dust collector (62), the dust collection box (61) is covered on the support frame (4), the fixed plate (21), the mounting member (22), the control member (23), the grinding head (1) and the support assembly (5) are all arranged in the dust collection box (61), and the negative pressure pipeline of the dust collector (62) is connected to the dust collection box (61).

7. The cylindrical shaft inner wall grinding device according to claim 5, characterized in that: The cylindrical shaft inner wall grinding device also includes a driving screw (7) for driving the positioning fixture (51) to move along the first axis. The driving screw (7) is arranged on the support frame (4) and extends along the first axis. The bottom of the positioning fixture (51) is provided with a first threaded hole that is threadably matched with the driving screw (7).

8. The cylindrical shaft inner wall grinding device according to claim 7, characterized in that: The support assembly (5) further comprises a support bracket (52). Along the first axis, the positioning fixture (51) and the support bracket (52) are arranged at intervals, and a second threaded hole adapted to the thread of the driving screw (7) is provided at the bottom of the support bracket (52).

9. The cylindrical shaft inner wall grinding device according to claim 5, characterized in that: The cylindrical shaft inner wall grinding device further comprises a driving assembly (8) arranged on the supporting frame (4), wherein the driving assembly (8) is used to drive the first control shaft (31) and the second control shaft (32) to rotate synchronously or relatively.

10. A cylindrical shaft production line, characterized in that: It comprises the cylindrical shaft inner wall grinding device as claimed in any one of claims 1 to 9.

Images