Bearing surface polishing device

By employing a worm gear drive and arc-groove clamping structure, a near-field collection hood and easily removable filter plate design, and three electric telescopic rod adjustments, the problems of unstable clamping, incomplete dust treatment, and inflexible control in bearing surface grinding devices have been solved, achieving efficient and precise bearing surface grinding and environmental protection.

CN224239065UActive Publication Date: 2026-05-15NINGBO NBVO SEIKO BEARING
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
NINGBO NBVO SEIKO BEARING
Filing Date
2025-06-13
Publication Date
2026-05-15

AI Technical Summary

Technical Problem

Existing bearing surface grinding devices suffer from insufficient automation in positioning and clamping, making it difficult to quickly and accurately clamp bearings of different specifications. They also have low dust collection efficiency and lack multi-dimensional control capabilities, which affects processing accuracy and environmental hygiene.

Method used

The system employs a worm gear drive and an arc-shaped groove clamping structure to achieve fast and precise clamping. It also features a dust removal system with a near-field collection hood and an easily removable filter plate. Combined with the adjustment of three electric telescopic rods and threaded rods, it achieves multi-dimensional precise adjustment.

Benefits of technology

It ensures a stable and non-deviation-free grinding process, efficiently captures dust, adapts to the multi-dimensional grinding needs of complex curved bearings, and improves processing accuracy and environmental hygiene.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of bearing machining, and discloses a bearing surface polishing device which comprises a positioning assembly and a polishing assembly, the positioning assembly comprises a shell, a driving piece is arranged in an inner cavity of the shell, vertical pipes are movably connected to the two sides of the top of the shell through bearings, and vertical rods are movably connected to the inner walls of the vertical pipes through bearings; the top of the vertical rod is fixedly connected with a clamping piece, and the bottom of the vertical rod is fixedly connected with the top of the shell. And the dust removal assembly comprises a collection cover and a dust removal box, and one side of the collection cover communicates with the dust removal box. The positioning assembly is of a worm and gear transmission and arc-shaped groove clamping structure, bearings of different specifications can be rapidly and accurately clamped, it is ensured that grinding is stable and free of deviation, the dust removal assembly efficiently captures and filters dust through the design of a near-field collecting cover and an easily-disassembled filter plate, the working environment is improved, maintenance is convenient, and the practicability is high. The polishing assembly achieves multi-dimensional accurate adjustment in the transverse direction, the longitudinal direction and the vertical direction through combination of three electric telescopic rods and a threaded rod, and the complex polishing requirement is met.
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Description

Technical Field

[0001] This utility model relates to the field of bearing processing technology, and in particular to a bearing surface grinding device. Background Technology

[0002] As a core component of mechanical transmission systems, the surface finish of bearings directly affects the operational accuracy, service life, and stability of the equipment. Surface grinding is a crucial step in bearing manufacturing, aiming to remove residual burrs, oxide layers, and other defects, improving surface roughness and geometric accuracy to meet assembly and usage requirements under different operating conditions. The bearing surface grinding device, as the core equipment for this process, is closely related to the rationality of its structural design, the completeness of its functions, and the grinding accuracy and efficiency, directly determining the quality grade of the finished bearing and production efficiency.

[0003] Existing bearing surface grinding devices have certain shortcomings in practical applications. Firstly, the automation and adaptability of the positioning and clamping mechanism are insufficient, making it difficult to quickly and accurately clamp bearings of different specifications stably. Furthermore, positioning deviations during grinding may lead to uneven grinding, affecting the surface machining accuracy of the bearings. Secondly, the dust collection efficiency of the dust removal system is low, failing to continuously and efficiently handle the dust generated during grinding. This not only pollutes the working environment but may also adversely affect equipment operation and the health of operators. In addition, the adjustment functions of the grinding components are limited, lacking multi-dimensional and precise control capabilities, making it difficult to meet the diverse grinding needs of complex curved bearings, thus restricting the device's applicability and processing flexibility. Utility Model Content

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.

[0005] In view of the problems existing in the above and / or existing bearing surface grinding devices, this utility model is proposed.

[0006] Therefore, the problems to be solved by this utility model are the difficulty in quickly and accurately clamping bearings of different specifications, low dust collection efficiency, and lack of multi-dimensional control.

[0007] To solve the above technical problems, the present invention provides the following technical solution: a bearing surface grinding device, comprising a positioning component, including a housing, a driving component disposed in the inner cavity of the housing, vertical tubes movably connected to both sides of the top of the housing via bearings, vertical rods movably connected to the inner walls of the vertical tubes via bearings, a clamping component fixedly connected to the top of the vertical rods, and the bottom of the vertical rods fixedly connected to the top of the housing;

[0008] A dust removal assembly includes a collection hood and a dust collection box. One side of the collection hood is connected to the dust collection box. A filter plate is installed inside the dust collection box, and a fan is connected to the top of the dust collection box.

[0009] A grinding assembly includes a vertical plate, an adjusting element is provided through the surface of the vertical plate, and a grinding host is fixedly connected to the bottom of the adjusting element.

[0010] In a preferred embodiment of the bearing surface grinding device of this utility model, the driving component includes a first motor, which is fixed to the bottom of the inner cavity of the housing. A worm gear is fixedly connected to the output end of the first motor, and a worm wheel that cooperates with the worm gear is fixedly connected to the bottom of the vertical tube.

[0011] In a preferred embodiment of the bearing surface grinding device of this utility model, the clamping member includes a rotating plate and a positioning plate. The rotating plate is fixedly sleeved on the surface of the vertical tube, and the positioning plate is fixed to the top of the vertical rod. The surface of the positioning plate is provided with evenly distributed through grooves. A sliding rod is fixedly connected to the inner wall of the through grooves. A sliding sleeve is slidably connected to the surface of the sliding rod. A clamping plate is fixedly connected to the top of the sliding sleeve, and a moving rod is fixedly connected to the bottom of the sliding sleeve. An arc-shaped groove is provided on the top of the rotating plate to cooperate with the moving rod.

[0012] As a preferred embodiment of the bearing surface grinding device of this utility model, the filter plate has slots on both sides, the slot cavity is provided with an insert plate, and the surface of the insert plate is fixedly connected to the inner wall of the dust removal box.

[0013] In a preferred embodiment of the bearing surface grinding device of this utility model, the adjusting component includes a first electric telescopic rod, the output end of which is fixedly connected to a bracket, a threaded rod being movably connected to the inner wall of the bracket via a bearing, a second motor being fixedly connected to one side of the bracket, the output end of the second motor being fixedly connected to one end of the threaded rod, a movable sleeve being threadedly connected to the surface of the threaded rod, a support plate being fixedly connected to the surface of the movable sleeve, a second electric telescopic rod being provided through the top of the support plate, and the output end of the second electric telescopic rod being fixedly connected to the top of the grinding host.

[0014] In a preferred embodiment of the bearing surface grinding device of this utility model, a limiting rod is provided through the surface of the movable sleeve, the surface of the limiting rod is slidably connected to the movable sleeve, and both ends of the limiting rod are fixedly connected to the inner wall of the bracket.

[0015] In a preferred embodiment of the bearing surface grinding device of this utility model, a cleaning plate is provided on one side of the dust collection box, and bolts are provided through the surface of the cleaning plate, and the cleaning plate is fixedly connected to the dust collection box by the bolts.

[0016] In a preferred embodiment of the bearing surface grinding device of this utility model, a horizontal plate is fixedly connected to the bottom of the vertical plate, and the housing, the collection cover and the dust removal box are all fixed to the top of the horizontal plate.

[0017] In a preferred embodiment of the bearing surface grinding device of this utility model, side plates are fixedly connected to both sides of the bottom of the horizontal plate, and a bottom plate is fixedly connected to the bottom of the side plates.

[0018] In a preferred embodiment of the bearing surface grinding device of this utility model, anti-slip pads are fixedly connected to both sides of the bottom of the base plate, and anti-slip patterns are provided on the bottom of the anti-slip pads.

[0019] The beneficial effects of this utility model are as follows: the positioning component adopts a worm gear transmission and an arc groove clamping structure, which can quickly and accurately clamp bearings of different specifications to ensure stable grinding without deviation. The dust removal component, through the near-field collection cover and easy-to-remove filter plate design, efficiently captures and filters dust, improves the working environment and facilitates maintenance. The grinding component, with the combination of three electric telescopic rods and threaded rods, achieves multi-dimensional precise adjustment in the horizontal, vertical and longitudinal directions, adapting to complex grinding needs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0021] Figure 1 This is a three-dimensional structural diagram of a bearing surface grinding device.

[0022] Figure 2 A three-dimensional view of the adjustment components of the bearing surface grinding device.

[0023] Figure 3 A 3D view of the positioning components of the bearing surface grinding device.

[0024] Figure 4A three-dimensional view of the clamping components of the bearing surface grinding device.

[0025] Figure 5 A 3D view of the drive component of the bearing surface grinding device.

[0026] Figure 6 A 3D view of the dust removal components of a bearing surface grinding device.

[0027] Figure 7 Bearing surface grinding device Figure 6 Enlarged diagram of A in the middle Detailed Implementation

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0029] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0030] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0031] Example 1

[0032] Reference Figure 1-3 and Figure 6This is the first embodiment of the present invention, which provides a bearing surface grinding device. The bearing surface grinding device includes a positioning assembly 100, including a housing 110. A driving member 120 is disposed in the inner cavity of the housing 110. Vertical tubes 130 are movably connected to both sides of the top of the housing 110 via bearings. Vertical rods 140 are movably connected to the inner wall of the vertical tubes 130 via bearings. A clamping member 150 is fixedly connected to the top of the vertical rods 140. The bottom of the vertical rods 140 is fixedly connected to the top of the housing 110. After the first motor 121 is started, the output worm gear 122 drives the worm wheel 123 to rotate. The worm wheel 123 drives the vertical tubes 130 to rotate around the housing 110. The bearing at the top rotates, and the rotating plate 151 fixed on the outside of the vertical tube 130 rotates synchronously with the vertical tube 130. The arc groove 158 at the top of the plate 151 cooperates with the bottom end of the moving rod 157 to form a "rotation-linear motion" conversion. When the rotating plate 151 rotates, the contour of the arc groove 158 pushes the moving rod 157 to move along the slide rod 154 toward the center of the vertical rod 140, which drives the sliding sleeve 155 and the clamping plate 156 to converge toward the center synchronously. The bearing is clamped by the synchronous movement of the three clamping plates 156. When rotating in the opposite direction, the arc groove 158 releases the moving rod 157, and the clamping plate 156 releases the bearing on the slide rod 154 by the restoring force, thus achieving quick clamping.

[0033] Specifically, the dust removal component 200 includes a collection hood 210 and a dust collection box 220. One side of the collection hood 210 is connected to the dust collection box 220. The dust collection box 220 is equipped with a filter plate 230 in its inner cavity. A fan 240 is connected to the top of the dust collection box 220. When the fan 240 is started, it creates a negative pressure. The collection hood 210 is close to the grinding area and draws the dust generated by grinding into the dust collection box 220 with the airflow. After the dust enters the dust collection box 220, it is intercepted by the filter plate 230, and the clean air is discharged by the fan 240.

[0034] Specifically, the grinding assembly 300 includes a vertical plate 310, an adjusting member 320 is provided through the surface of the vertical plate 310, and a grinding host 330 is fixedly connected to the bottom of the adjusting member 320. The position of the grinding host 330 is adjusted by the adjusting member 320 so that it fits the bearing surface to be ground; the grinding host 330 is started to grind the bearing surface.

[0035] Example 2

[0036] Reference Figure 2-5 and Figure 7 This is the second embodiment of the present invention, which is based on the previous embodiment.

[0037] Specifically, the driving component 120 includes a first motor 121, which is fixed to the bottom of the inner cavity of the housing 110. A worm gear 122 is fixedly connected to the output end of the first motor 121. A worm wheel 123 that works with the worm gear 122 is fixedly connected to the bottom of the vertical tube 130. The worm gear 122 drives the worm wheel 123, which provides smooth transmission and self-locking, ensuring the accuracy and stability of the rotation and positioning of the vertical tube 130. This avoids uneven grinding caused by the shaking of the clamping mechanism during the grinding process. The rotation of the vertical tube 130 is achieved by driving the first motor 121, which indirectly controls the clamping / releasing action of the clamping component 150, thereby improving clamping efficiency and automation.

[0038] Specifically, the clamping component 150 includes a rotating plate 151 and a positioning plate 152. The rotating plate 151 is fixedly sleeved on the surface of the vertical tube 130, and the positioning plate 152 is fixed to the top of the vertical rod 140. The surface of the positioning plate 152 has evenly distributed through grooves 153. A sliding rod 154 is fixedly connected to the inner wall of the through grooves 153. A sliding sleeve 155 is slidably connected to the surface of the sliding rod 154. A clamping plate 156 is fixedly connected to the top of the sliding sleeve 155, and a moving rod 157 is fixedly connected to the bottom of the sliding sleeve 155. The top of the rotating plate 151 is provided with an arc-shaped groove 158 for use with the moving rod 157. The arc-shaped groove 158 of the rotating plate 151 cooperates with the moving rod 157. By rotating, the clamping plate 156 is driven to synchronously converge or reset along the slide rod 154 towards the center. It can quickly clamp bearings of different specifications, solve the problem of "difficulty in adapting to different sizes", and has high clamping stability. The cooperation between the slide rod 154 and the sliding sleeve 155 ensures that the clamping plate 156 moves linearly, avoids tilting or jamming, and improves the bearing positioning accuracy.

[0039] Specifically, slots 231 are provided on both sides of the filter plate 230, and insert plates 232 are provided in the inner cavity of the slots 231. The surface of the insert plates 232 is fixedly connected to the inner wall of the dust collection box 220. The filter plate 230 is connected to the insert plates 232 through the slots 231, which is convenient for disassembly and cleaning. Dust accumulation can be removed regularly to maintain the continuous and efficient filtration capacity of the dust collection box 220 and avoid reducing dust collection efficiency due to dust blockage.

[0040] Specifically, the adjusting component 320 includes a first electric telescopic rod 321. A bracket 322 is fixedly connected to the output end of the first electric telescopic rod 321. A threaded rod 323 is movably connected to the inner wall of the bracket 322 via a bearing. A second motor 324 is fixedly connected to one side of the bracket 322. The output end of the second motor 324 is fixedly connected to one end of the threaded rod 323. A movable sleeve 325 is threadedly connected to the surface of the threaded rod 323. A support plate 326 is fixedly connected to the surface of the movable sleeve 325. A second electric telescopic rod 327 is provided through the top of the support plate 326. The output end of the second electric telescopic rod 327 is fixedly connected to the top of the grinding host 330. The first electric telescopic rod 321 adjusts the horizontal position of the grinding host 330. The second motor 324, in conjunction with the threaded rod 323, drives the movable sleeve 325 to slide vertically, thereby realizing the vertical horizontal adjustment of the grinding host 330. The second electric telescopic rod 327 adjusts the vertical direction, ensuring that the grinding host 330 is in contact with the bearing surface.

[0041] Specifically, a limiting rod 328 is provided through the surface of the movable sleeve 325. The surface of the limiting rod 328 is slidably connected to the movable sleeve 325. Both ends of the limiting rod 328 are fixedly connected to the inner wall of the bracket 322. The limiting rod 328 restricts the rotation of the movable sleeve 325, ensuring that it slides linearly along the threaded rod 323, avoiding possible deviation due to threaded transmission, and improving adjustment accuracy and grinding stability.

[0042] Example 3

[0043] Reference Figure 1 and Figure 6 This is the third embodiment of the present invention, which is based on the first two embodiments.

[0044] Specifically, a cleaning plate 221 is provided on one side of the dust collection box 220. Bolts are installed through the surface of the cleaning plate 221. The cleaning plate 221 is fixedly connected to the dust collection box 220 by bolts. The cleaning plate 221 can be quickly disassembled by bolts, which facilitates deep cleaning of the inside of the dust collection box 220, maintains dust collection efficiency, and ensures long-term stable operation of the equipment.

[0045] Specifically, a horizontal plate 400 is fixedly connected to the bottom of the vertical plate 310. The housing 110, the collection cover 210 and the dust collection box 220 are all fixed to the top of the horizontal plate 400. The horizontal plate 400 integrates the housing 110, the collection cover 210 and the dust collection box 220 to form a unified base and enhance the overall structural rigidity.

[0046] Specifically, side plates 500 are fixedly connected to both sides of the bottom of the horizontal plate 400, and bottom plate 600 is fixedly connected to the bottom of the side plates 500.

[0047] Specifically, anti-slip pads are fixedly connected to both sides of the bottom of the base plate 600. The anti-slip pads have anti-slip patterns on the bottom. The design of the side plate 500, the base plate 600, and the anti-slip pads reduces vibration and displacement during operation, ensuring the stability of each component during grinding, and indirectly improving grinding accuracy and equipment life.

[0048] In use, after the first motor 121 starts, the worm gear 122 at its output end drives the worm wheel 123 to rotate. The worm wheel 123 drives the vertical tube 130 to rotate around the bearing at the top of the housing 110. The rotating plate 151 fixed on the outside of the vertical tube 130 rotates synchronously with the vertical tube 130. The arc groove 158 on the rotating plate 151 cooperates with the bottom end of the moving rod 157. When the rotating plate 151 rotates, the contour of the arc groove 158 pushes the moving rod 157 to move along the slide rod 154 towards the center of the rotating rod. When moving, the sliding sleeve 155 and clamping plate 156 move towards the center along the sliding rod 154 in the through groove 153, clamping the bearing through the synchronous movement of the three clamping plates 156; when rotating in the opposite direction, the arc groove 158 releases the moving rod 157, the clamping plate 156 returns to its original position on the sliding rod 154, releasing the bearing, the first electric telescopic rod 321 drives the bracket 322 to move up and down, adjusting the horizontal position of the grinding host 330, the second motor 324 drives the threaded rod 323 to rotate, and the threaded moving sleeve 32... 5. The threaded rod 323 slides laterally, driving the support plate 326 and the grinding host 330 to move longitudinally and horizontally. The lateral horizontal position, combined with the longitudinal horizontal movement, enables grinding of bearings at different positions. The second electric telescopic rod 327 is installed on the support plate 326, and its output end is directly connected to the grinding host 330, realizing the vertical adjustment of the grinding host 330 to ensure contact with the bearing surface. The grinding host 330 grinds the bearing. During the grinding process, the multi-dimensional movement of the adjusting part 320 can achieve precise grinding of different parts of the bearing. After the fan 240 is started, a negative pressure is formed, which sucks the dust generated during the grinding process into the dust collection box 220 through the collection hood 210. The position of the collection hood 210 is close to the grinding area to ensure efficient dust capture. After the dust enters the dust collection box 220, it is intercepted by the filter plate 230. Clean air is discharged by the fan 240. The cleaning plate 221 on the side of the dust collection box 220 is disassembled periodically to remove the dust accumulated on the surface of the filter plate 230 and maintain the continuous operation of the dust collection system.

[0049] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A bearing surface grinding device, characterized in that: include, The positioning assembly (100) includes a housing (110), a drive component (120) is provided in the inner cavity of the housing (110), vertical tubes (130) are movably connected to both sides of the top of the housing (110) via bearings, vertical rods (140) are movably connected to the inner wall of the vertical tubes (130) via bearings, a clamping component (150) is fixedly connected to the top of the vertical rods (140), and the bottom of the vertical rods (140) is fixedly connected to the top of the housing (110); The dust removal assembly (200) includes a collection hood (210) and a dust collection box (220). One side of the collection hood (210) is connected to the dust collection box (220). A filter plate (230) is provided in the inner cavity of the dust collection box (220). A fan (240) is connected to the top of the dust collection box (220). The grinding assembly (300) includes a vertical plate (310), an adjusting member (320) is provided through the surface of the vertical plate (310), and a grinding host (330) is fixedly connected to the bottom of the adjusting member (320).

2. The bearing surface grinding device as described in claim 1, characterized in that: The driving component (120) includes a first motor (121), which is fixed to the bottom of the inner cavity of the housing (110). A worm gear (122) is fixedly connected to the output end of the first motor (121), and a worm wheel (123) that works with the worm gear (122) is fixedly connected to the bottom of the vertical tube (130).

3. The bearing surface grinding device as described in claim 1, characterized in that: The clamping member (150) includes a rotating plate (151) and a positioning plate (152). The rotating plate (151) is fixedly sleeved on the surface of the vertical tube (130). The positioning plate (152) is fixed to the top of the vertical rod (140). The surface of the positioning plate (152) is provided with evenly distributed through grooves (153). A sliding rod (154) is fixedly connected to the inner wall of the through groove (153). A sliding sleeve (155) is slidably connected to the surface of the sliding rod (154). A clamping plate (156) is fixedly connected to the top of the sliding sleeve (155). A moving rod (157) is fixedly connected to the bottom of the sliding sleeve (155). An arc-shaped groove (158) is provided on the top of the rotating plate (151) to cooperate with the moving rod (157).

4. The bearing surface grinding device as described in claim 1, characterized in that: The filter plate (230) has slots (231) on both sides, and the slot (231) has an insert plate (232) inside. The surface of the insert plate (232) is fixedly connected to the inner wall of the dust collector (220).

5. The bearing surface grinding device as described in claim 1, characterized in that: The adjusting component (320) includes a first electric telescopic rod (321), the output end of which is fixedly connected to a bracket (322). The inner wall of the bracket (322) is movably connected to a threaded rod (323) via a bearing. A second motor (324) is fixedly connected to one side of the bracket (322). The output end of the second motor (324) is fixedly connected to one end of the threaded rod (323). A movable sleeve (325) is threaded onto the surface of the threaded rod (323). A support plate (326) is fixedly connected to the surface of the movable sleeve (325). A second electric telescopic rod (327) is provided through the top of the support plate (326). The output end of the second electric telescopic rod (327) is fixedly connected to the top of the grinding host (330).

6. The bearing surface grinding device as described in claim 5, characterized in that: A limiting rod (328) is provided through the surface of the movable sleeve (325). The surface of the limiting rod (328) is slidably connected to the movable sleeve (325). Both ends of the limiting rod (328) are fixedly connected to the inner wall of the bracket (322).

7. The bearing surface grinding device as described in claim 1, characterized in that: A cleaning plate (221) is provided on one side of the dust collection box (220). Bolts are provided through the surface of the cleaning plate (221), and the cleaning plate (221) is fixedly connected to the dust collection box (220) by the bolts.

8. The bearing surface grinding device as described in claim 1, characterized in that: The bottom of the vertical plate (310) is fixedly connected to the horizontal plate (400), and the housing (110), the collection cover (210) and the dust collection box (220) are all fixed to the top of the horizontal plate (400).

9. The bearing surface grinding device as described in claim 8, characterized in that: The horizontal plate (400) is fixedly connected to side plates (500) on both sides of its bottom, and the bottom of the side plates (500) is fixedly connected to a bottom plate (600).

10. The bearing surface grinding device as described in claim 9, characterized in that: Anti-slip pads are fixedly connected to both sides of the bottom of the base plate (600), and anti-slip patterns are provided on the bottom of the anti-slip pads.