Negative clearance value measuring device for ball hub bearing

Abstract

The utility model discloses a negative clearance value measuring device for a ball hub bearing, which relates to the technical field of bearing negative clearance value measurement and comprises an operating table, level bubbles are mounted at the top end of the operating table and mounted on four sides of the top end of the operating table close to corners, and a support is in threaded connection with the top end of the operating table. By the adoption of the structure, bearings are placed on the inner sides of the first clamping plate and the second clamping plate, the position of the first clamping plate can be adjusted by starting the telescopic air cylinder, and therefore the bearings of different sizes can be clamped and limited, when a user screws the threaded rod, the rotating shaft can enable the tail end of the threaded rod to rotate in situ, the supporting plate can be pushed accordingly, and therefore the supporting plate can be clamped and limited. The height of the dial indicator can be conveniently adjusted by a user, the dial indicator is adjusted to the height at which the bearing can be conveniently detected, and then the dial indicator slides to the position symmetrical to the bearing, so that follow-up detection can be facilitated, and the purpose of conveniently detecting bearings of different sizes can be achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bearing negative clearance value measurement, in particular to a negative clearance value measuring device for a ball hub bearing. Background Art

[0002] Ball hub bearings usually refer to spherical bearings used in the automotive field to support the rotation of wheels and hubs. Spherical bearings are a type of bearing that can withstand both radial and axial loads. They are spherical in shape, so they are also called spherical sliding bearings. When the bearing is working, the axial clearance is large, and the number of rolling elements that bear the load is small. Since the load-bearing raceway is less than half a circle, it is very easy to reduce the service life of the bearing. At the same time, too much clearance will also cause the relative inclination angle of the inner and outer rings of the bearing to be too large, which will eventually manifest as wheel shaking. In severe cases, the rolling elements will deviate from the normal working area, which will cause abnormal noise in the bearing. Therefore, reasonable working clearance is crucial to improving the performance of the hub bearing.

[0003] A Chinese patent with publication number "CN220120000U" discloses a wheel hub bearing negative clearance detection device, including a support frame and a fixed base, wherein the fixed base is installed and connected to the middle position of the upper end of the support frame. In the utility model, the bearing fixing assembly, the motor and the active rotating wheel are used in conjunction to facilitate clamping, and the device can be rotated during use, and the U-shaped clamping plate is opened to both sides, and then the bearing is placed in the bearing placement plate, and then the U-shaped clamping plate is loosened, and the U-shaped clamping plate is pushed forward under the elastic force of the fixed spring.

[0004] However, this device still has some shortcomings. Because different bearings have different models and sizes, the size of the space for limiting the bearings in this device is fixed, so this device can only perform limit detection on bearings of specified sizes. If the bearing is larger or smaller, the user needs to replace the limit accessories that match its size to perform limit detection on it. While reducing the efficiency of bearing detection, it also increases the difficulty of bearing detection for users. Utility Model Content

[0005] In view of the problems mentioned in the background technology, the purpose of the utility model is to provide a negative clearance value measuring device for a ball hub bearing to solve the problems mentioned in the background technology.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A device for measuring the negative clearance value of a ball hub bearing comprises an operating table, a level bubble is installed on the top of the operating table, the level bubble is installed on the four sides of the top corner of the operating table, the top of the operating table is threadedly connected to a bracket, a second screw hole is opened at the top of the bracket, a screw is threadedly connected to the inner side of the second screw hole, a support plate is slidably connected to the inner wall of the bracket, the top of the support plate is rotatably connected to a rotating shaft, the bottom end of the screw is fixedly connected to the top of the rotating shaft, the front side of the bracket is slidably connected to a fixing plate, the front side of the bracket is opened with a second slide groove matching the fixing plate, the fixing plate is slidably connected to the front side of the support plate through the second slide groove, the top of the fixing plate is fixedly connected to an iron plate, the top of the support plate is opened with a groove, the inner bottom end of the groove is fixedly connected to a magnet, the magnet covers the inner side of the groove, the position of the top of the magnet is on the same horizontal line as the position of the top of the support plate, the top of the magnet is aligned with the bottom end of the iron plate The top of the fixed plate is provided with a mounting hole, the inner side of the mounting hole is provided with a dial indicator, the top of the operating table is provided with a telescopic cylinder, one side of the telescopic cylinder is fixedly connected with a first clamping plate, the top of the operating table is fixedly connected with a second clamping plate, the position of the first clamping plate is symmetrical with the position of the second clamping plate, the shapes of the first clamping plate and the second clamping plate are both arc-shaped, the ball hub bearing is placed on the inner side of the first clamping plate and the second clamping plate, the user starts the telescopic cylinder to push the first clamping plate to move, under the clamping of the first clamping plate and the second clamping plate, the bearings of different sizes can be clamped and limited, after the bearing is limited, the user can turn the screw to rotate, and the rotating shaft can make the bottom end of the screw rotate in situ, so that it is convenient for the user to adjust the height of the support plate, adjust the support plate to a height convenient for using the dial indicator, and then adjust the dial indicator to a position convenient for detecting the bearing through the sliding principle.

[0008] As a preferred technical solution, a first screw hole is provided at the top of the bracket, and the first screw hole passes through the top of the bracket and the operating table. A bolt is threadedly connected to the inner side of the first screw hole, and the bottom end of the bolt is threadedly connected to the inside of the operating table through the first screw hole. The bracket is threadedly connected to the top of the operating table through the first screw hole and the bolt. The first screw hole is provided on the four sides of the top of the bracket near the corners, and the position of the bracket can be effectively limited and fixed by screwing the bolt in. When disassembling the bracket, the bolt can be screwed out of the first screw hole, thereby achieving the purpose of facilitating disassembly and assembly of the bracket.

[0009] As a preferred technical solution, a first slide groove is opened on the inner wall of the bracket, and a limit plate matching the first slide groove is fixedly connected to the outer wall of the support plate. The limit plate is slidably connected to the inner side of the first slide groove, and the support plate is slidably connected to the inner wall of the bracket through the first slide groove and the limit plate. By opening the first slide groove, the moving position of the support plate can be effectively limited, thereby effectively improving the stability of the height adjustment of the support plate.

[0010] As a preferred technical solution, a telescopic rod is fixedly connected to the top of the support plate, the top of the telescopic rod is fixedly connected to the bottom end of the bracket, the telescopic rod is fixedly connected to the corner position of the top of the support plate, and the screw is located on the inner side of the telescopic rod. By installing the telescopic rod, the top of the support plate can be supported secondary, and the angle of the support plate height adjustment can also be limited secondary. While improving the stability of the support plate height adjustment, it can also avoid the angle deviation of the support plate.

[0011] As a preferred technical solution, the bottom end of the first clamp is slidably connected to the top of the operating table, and a third sliding groove matching the first clamp is opened at the top of the operating table. The bottom end of the first clamp is slidably connected to the top of the operating table through the third sliding groove. By opening the third sliding groove, the sliding position and angle of the first clamp can be effectively limited, thereby effectively improving the stability of the position movement of the first clamp.

[0012] As a preferred technical solution, a strip groove is provided at the top of the operating table, and an anti-skid pad is fixedly connected to the inner bottom end of the strip groove, and the anti-skid pad covers the inner side of the strip groove. The position of the top of the anti-skid pad is on the same horizontal line as the position of the top of the operating table, and the top position of the anti-skid pad is symmetrical to the bottom end position of the first clamping plate. By installing the anti-skid pad, the position where the bearing is placed can be prevented from sliding, thereby further improving the stability of the bearing position fixation.

[0013] As a preferred technical solution, the bottom end of the operating table is fixedly connected with a support leg, and the support leg is fixedly connected to the four sides of the bottom end of the operating table near the corners. The bottom end of the operating table is fixedly connected to a limit frame, and the inner side of the limit frame is fixedly connected with a rubber pad, and the rubber pad covers the inner side of the limit frame. The position of the bottom end of the rubber pad is on the same horizontal line as the position of the bottom end of the support leg. By installing the support leg, the bottom end of the operating table can be effectively supported, and the rubber pad can share the force area of ​​the bottom end of the support leg, thereby effectively improving the stability of the bottom end of the operating table.

[0014] As a preferred technical solution, a power supply module is installed on the top of the operating table, and a control module is installed on the top of the operating table. The power supply module is connected to the control module and the telescopic cylinder circuit, and the control module is electrically connected to the telescopic cylinder. The operation of the telescopic cylinder is effectively controlled through the control module, and it is more convenient and quick for the user to control the operation of the device through the control module.

[0015] In summary, the utility model mainly has the following beneficial effects:

[0016] First, when in use, the bearing is placed on the inner side of the first clamping plate and the second clamping plate, and the position of the first clamping plate can be adjusted by starting the telescopic cylinder, so that bearings of different sizes can be clamped and limited. When the user turns the screw, the rotating shaft can make the end of the screw rotate in place, and the supporting plate will be pushed accordingly, so that it is convenient for the user to adjust the height of the dial indicator. The dial indicator is adjusted to a height that is convenient for detecting the bearing, and the dial indicator is slid to a position symmetrical to the bearing through the second slide groove for later detection. The adsorption of the magnet and the iron plate can prevent the fixed plate from being displaced, so that the purpose of conveniently detecting bearings of different sizes can be achieved;

[0017] Secondly, due to the presence of the first slide groove and the telescopic rod, the angle of the support plate height adjustment can be effectively limited, and the stability of the support plate height adjustment can also be improved, thereby effectively avoiding the angle deviation when the support plate height is adjusted. Because the bracket is threadedly fixed to the top of the operating table, when the bracket needs to be removed, the bolt can be screwed out of the first screw hole, thereby achieving the purpose of facilitating the disassembly and assembly of the bracket. After the bracket is removed, the workpiece on the bracket will also be removed together, thereby facilitating the user to maintain the workpiece on the bracket. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model;

[0019] Figure 2 This utility model Figure 1 A schematic diagram of the enlarged structure of part A;

[0020] Figure 3 It is a schematic diagram of the support structure of the utility model;

[0021] Figure 4 It is a schematic diagram of the top structure of the operating table of the utility model;

[0022] Figure 5 It is a schematic diagram of the bottom structure of the utility model.

[0023] Figure numerals: 1. operating table, 2. level bubble, 3. bracket, 4. first screw hole, 5. bolt, 6. second screw hole, 7. screw, 8. support plate, 9. rotating shaft, 10. limit plate, 11. first slide groove, 12. fixing plate, 13. second slide groove, 14. mounting hole, 15. dial indicator, 16. telescopic rod, 17. groove, 18. magnet, 19. iron plate, 20. telescopic cylinder, 21. first splint, 22. second splint, 23. third slide groove, 24. strip groove, 25. anti-slip pad, 26. power supply module, 27. control module, 28. leg, 29. limit frame, 30. rubber pad. DETAILED DESCRIPTION

[0024] refer to Figures 1 to 5 A negative clearance value measuring device for a ball hub bearing of the present embodiment comprises an operating table 1, a level bubble 2 is installed at the top of the operating table 1, and the level bubble 2 is installed on the four sides of the top corner of the operating table 1, a bracket 3 is threadedly connected to the top of the operating table 1, a second screw hole 6 is opened at the top of the bracket 3, a screw 7 is threadedly connected to the inner side of the second screw hole 6, a support plate 8 is slidably connected to the inner wall of the bracket 3, a rotating shaft 9 is rotatably connected to the top of the support plate 8, and the bottom end of the screw 7 is fixedly connected to the top of the rotating shaft 9, a fixing plate 12 is slidably connected to the front side of the bracket 3, and a second screw hole 6 is opened at the front side of the bracket 3. The fixing plate 12 is matched with a second slide groove 13, and the fixing plate 12 is slidably connected to the front side of the support plate 8 through the second slide groove 13. The top of the fixing plate 12 is fixedly connected with an iron plate 19, and the top of the support plate 8 is provided with a groove 17, and the inner bottom end of the groove 17 is fixedly connected with a magnet 18, and the magnet 18 covers the inner side of the groove 17. The position of the top of the magnet 18 is on the same horizontal line as the position of the top of the support plate 8, and the top of the magnet 18 is attached to the bottom of the iron plate 19. The top of the fixing plate 12 is provided with a mounting hole 14, and a dial indicator 15 is installed inside the mounting hole 14. The top of the operating table 1 A telescopic cylinder 20 is installed at the end, and a first clamping plate 21 is fixedly connected to one side of the telescopic cylinder 20. A second clamping plate 22 is fixedly connected to the top of the operating table 1. The position of the first clamping plate 21 is symmetrical to the position of the second clamping plate 22. The shapes of the first clamping plate 21 and the second clamping plate 22 are both arc-shaped. When in use, the bearing is placed on the inner side of the first clamping plate 21 and the second clamping plate 22. The telescopic cylinder 20 can adjust the position of the first clamping plate 21, so that bearings of different sizes can be clamped and limited. The level bubble 2 can facilitate the user to effectively observe the horizontality of the operating table 1, so as to provide The stability of the horizontality of the high operating table 1 is that when the screw 7 is turned, the rotating shaft 9 can make the end of the screw 7 rotate in place, and the support plate 8 will be pushed or pulled accordingly, so that the user can adjust the height of the dial indicator 15 conveniently. The dial indicator 15 is adjusted to a height convenient for detecting the bearing. The dial indicator 15 can be slid to a position symmetrical to the bearing through the second slide groove 13 to facilitate subsequent detection. The adsorption of the magnet 18 and the iron plate 19 can prevent the fixed plate 12 from being displaced, thereby achieving the purpose of facilitating the detection of bearings of different sizes, and at the same time effectively improving the scope of use of this device.

[0025] refer to Figures 1 to 4A first screw hole 4 is provided at the top of the bracket 3, and the first screw hole 4 passes through the top of the bracket 3 and the operating table 1. A bolt 5 is threadedly connected to the inner side of the first screw hole 4, and the bottom end of the bolt 5 is threadedly connected to the inside of the operating table 1 through the first screw hole 4. The bracket 3 is threadedly connected to the top of the operating table 1 through the first screw hole 4 and the bolt 5. The first screw hole 4 is provided on the four sides of the top of the bracket 3 near the corners. Because the bracket 3 is threadedly fixed to the top of the operating table 1, when the bracket 3 needs to be disassembled, the bolt 5 can be screwed out of the first screw hole 4, thereby achieving the purpose of convenient disassembly and assembly of the bracket 3. After the bracket 3 is disassembled, the workpiece on the bracket 3 will also be disassembled together, thereby facilitating the user to maintain and handle the workpiece on the bracket 3.

[0026] refer to Figure 2 and Figure 3 The first slide groove 11 is provided on the inner wall of the bracket 3, and a limit plate 10 matching the first slide groove 11 is fixedly connected on the outer wall of the support plate 8. The limit plate 10 is slidably connected to the inner side of the first slide groove 11, and the support plate 8 is slidably connected to the inner wall of the bracket 3 through the first slide groove 11 and the limit plate 10. The top of the support plate 8 is fixedly connected with a telescopic rod 16, and the top of the telescopic rod 16 is fixedly connected to the bottom end of the bracket 3. The telescopic rod 16 is fixedly connected to the corner position of the top end of the support plate 8, and the screw 7 is located on the inner side of the telescopic rod 16. The telescopic rod 16 includes a movable rod and a sleeve rod. The movable rod is sleeved on the inner side of the sleeve rod, and the bottom end of the sleeve rod is fixedly connected to the top end of the support plate 8. The top end of the movable rod is fixedly connected to the bottom end of the bracket 3. Due to the existence of the first slide groove 11 and the telescopic rod 16, the angle of height adjustment of the support plate 8 can be effectively limited, and the stability of the height adjustment of the support plate 8 can also be improved, thereby effectively avoiding the angle deviation of the support plate 8 when the height is adjusted.

[0027] refer to Figure 1 and Figure 4 The bottom end of the first clamping plate 21 is slidably connected to the top end of the operating platform 1. A third sliding groove 23 matching the first clamping plate 21 is opened at the top end of the operating platform 1. The bottom end of the first clamping plate 21 is slidably connected to the top end of the operating platform 1 through the third sliding groove 23. Due to the opening of the third sliding groove 23, the position and angle of the movement of the first clamping plate 21 can be effectively limited, thereby effectively improving the stability of the position movement of the first clamping plate 21, and also effectively avoiding the angle deviation of the first clamping plate 21 when the position moves.

[0028] refer to Figure 1 and Figure 4A strip groove 24 is provided at the top of the operating table 1, and an anti-skid pad 25 is fixedly connected to the inner bottom end of the strip groove 24. The anti-skid pad 25 covers the inner side of the strip groove 24. The position of the top of the anti-skid pad 25 is on the same horizontal line as the position of the top of the operating table 1. The top position of the anti-skid pad 25 is symmetrical with the bottom end position of the first clamping plate 21. Due to the existence of the anti-skid pad 25, the anti-skid pad 25 can increase the friction force of the bottom end of the bearing, thereby preventing the placement point of the bearing from sliding, and at the same time, it can also effectively improve the stability of the bearing clamping and fixing.

[0029] refer to Figure 1 and Figure 5 The bottom end of the operating platform 1 is fixedly connected with a support leg 28, and the support leg 28 is fixedly connected to the four sides of the bottom end of the operating platform 1 near the corners. The bottom end of the operating platform 1 is fixedly connected with a limit frame 29, and the inner side of the limit frame 29 is fixedly connected with a rubber pad 30. The rubber pad 30 covers the inner side of the limit frame 29, and the position of the bottom end of the rubber pad 30 is on the same horizontal line as the position of the bottom end of the support leg 28. Due to the existence of the support leg 28, the support leg 28 can effectively support the bottom end of the operating platform 1. The rubber pad 30 is made of rubber material and has good anti-slip ability and rubber shock absorption ability, so it can secondary improve the stability of the bottom end of the operating platform 1. At the same time, the rubber pad 30 can also share the force area of ​​the bottom end of the support leg 28, thereby effectively preventing the operating platform 1 from displacement.

[0030] refer to Figure 1 A power supply module 26 is installed on the top of the operating table 1, and a control module 27 is installed on the top of the operating table 1. The power supply module 26 is connected to the control module 27 and the telescopic cylinder 20 circuit, and the control module 27 is electrically connected to the telescopic cylinder 20. Due to the existence of the power supply module 26, the electrical equipment on the operating table 1 can be effectively powered on, and the control module 27 can effectively control the operation of the telescopic cylinder 20. It is more convenient and quick for the user to control the operation through the control module 27.

[0031] Principle and advantages of use: When in use, the bearing is placed on the inner side of the first clamping plate 21 and the second clamping plate 22. The telescopic cylinder 20 can adjust the position of the first clamping plate 21, so that bearings of different sizes can be clamped and limited. The level bubble 2 can facilitate the user to effectively observe the horizontality of the operating table 1, so as to improve the stability of the horizontality of the operating table 1. The rotating shaft 9 can make the end of the screw rod 7 rotate in place. When the screw rod 7 is turned, the support plate 8 will be pushed or pulled accordingly, so that it is convenient for the user to adjust the height of the dial indicator 15. 5 is adjusted to a height convenient for testing the bearing, and the dial indicator 15 is slid to a position symmetrical to the bearing through the second slide groove 13 to test the bearing. The adsorption of the magnet 18 and the iron plate 19 can prevent the fixed plate 12 from being displaced. Because the bracket 3 is threadedly fixed to the top of the operating table 1, when the bracket 3 needs to be removed, the bolt 5 can be screwed out of the first screw hole 4, so that the purpose of convenient disassembly and assembly of the bracket 3 can be achieved. After the bracket 3 is removed, the workpiece on the bracket 3 will also be removed together, so it is convenient for the user to remove the workpiece on the bracket 3. Maintenance treatment is carried out. Due to the existence of the first slide groove 11 and the telescopic rod 16, the angle of the height adjustment of the support plate 8 can be effectively limited, and the stability of the height adjustment of the support plate 8 can also be improved, so that the angle deviation of the support plate 8 when the height is adjusted can be effectively avoided. Due to the opening of the third slide groove 23, the position and angle of the movement of the first clamping plate 21 can be effectively limited, so that the stability of the position movement of the first clamping plate 21 can be effectively improved, and the angle deviation of the position movement of the first clamping plate 21 can also be effectively avoided. Due to the existence of the anti-skid pad 25, the anti-skid pad 25 can increase the friction force at the bottom end of the bearing, so that the placement point of the bearing can be prevented from sliding, and the stability of the bearing clamping can also be effectively improved. Due to the existence of the support leg 28, the support leg 28 can effectively support the bottom end of the operating table 1, and the rubber pad 30 is made of rubber material, which has good anti-skid ability and rubber shock absorption ability, so that the stability of the bottom end of the operating table 1 can be secondary improved, and the rubber pad 30 can also share the force area at the bottom end of the support leg 28, so as to effectively avoid the displacement of the operating table 1.

Claims

1. A device for measuring the negative clearance value of a ball hub bearing, comprising an operating table (1), characterized in that: A level bubble (2) is installed at the top of the operating table (1), and the level bubble (2) is installed on the four sides of the top of the operating table (1) near the corners. The top of the operating table (1) is threadedly connected to a bracket (3). A second screw hole (6) is provided at the top of the bracket (3), and a screw rod (7) is threadedly connected to the inner side of the second screw hole (6). A support plate (8) is slidably connected to the inner wall of the bracket (3). The top of the support plate (8) is rotatably connected to a rotating shaft (9). The bottom end of the screw rod (7) is fixedly connected to the top of the rotating shaft (9). A fixed plate (12) is slidably connected to the front side of the bracket (3). A second slide groove (13) matching the fixed plate (12) is provided at the front side of the bracket (3). The fixed plate (12) is slidably connected to the front side of the support plate (8) through the second slide groove (13). The top of the fixed plate (12) is fixedly connected to an iron plate (19). The top of the support plate (8) is provided with a groove (17), the inner bottom end of the groove (17) is fixedly connected with a magnet (18), the magnet (18) covers the inner side of the groove (17), the top of the magnet (18) is on the same horizontal line as the top of the support plate (8), the top of the magnet (18) is in contact with the bottom of the iron plate (19), the top of the fixed plate (12) is provided with a mounting hole (14), the inner side of the mounting hole (14) is provided with a dial indicator (15), the top of the operating table (1) is provided with a telescopic cylinder (20), one side of the telescopic cylinder (20) is fixedly connected with a first clamping plate (21), the top of the operating table (1) is fixedly connected with a second clamping plate (22), the position of the first clamping plate (21) is symmetrical with the position of the second clamping plate (22), and the shapes of the first clamping plate (21) and the second clamping plate (22) are both arc-shaped.

2. The negative clearance value measuring device of a ball hub bearing according to claim 1, characterized in that: The top of the bracket (3) is provided with a first screw hole (4), the first screw hole (4) penetrates the top of the bracket (3) and the top of the operating table (1), the inner side of the first screw hole (4) is threadedly connected with a bolt (5), the bottom end of the bolt (5) is threadedly connected to the inside of the operating table (1) through the first screw hole (4), the bracket (3) is threadedly connected to the top of the operating table (1) through the first screw hole (4) and the bolt (5), and the first screw hole (4) is provided on four sides of the top of the bracket (3) close to the corners.

3. The negative clearance value measuring device of a ball hub bearing according to claim 1, characterized in that: A first sliding groove (11) is provided on the inner wall of the bracket (3); a limiting plate (10) matching the first sliding groove (11) is fixedly connected to the outer wall of the support plate (8); the limiting plate (10) is slidably connected to the inner side of the first sliding groove (11); and the support plate (8) is slidably connected to the inner wall of the bracket (3) via the first sliding groove (11) and the limiting plate (10).

4. The negative clearance value measuring device of a ball hub bearing according to claim 1, characterized in that: The top end of the support plate (8) is fixedly connected to a telescopic rod (16), the top end of the telescopic rod (16) is fixedly connected to the bottom end of the bracket (3), the telescopic rod (16) is fixedly connected to the corner position of the top end of the support plate (8), and the screw rod (7) is located on the inner side of the telescopic rod (16).

5. The negative clearance value measuring device of a ball hub bearing according to claim 1, characterized in that: The bottom end of the first clamping plate (21) is slidably connected to the top end of the operating table (1); the top end of the operating table (1) is provided with a third sliding groove (23) matching the first clamping plate (21); the bottom end of the first clamping plate (21) is slidably connected to the top end of the operating table (1) via the third sliding groove (23).

6. The negative clearance value measuring device of a ball hub bearing according to claim 1, characterized in that: The top of the operating table (1) is provided with a strip groove (24), the inner bottom end of the strip groove (24) is fixedly connected with an anti-skid pad (25), the anti-skid pad (25) covers the inner side of the strip groove (24), the top of the anti-skid pad (25) is located on the same horizontal line as the top of the operating table (1), and the top of the anti-skid pad (25) is symmetrical to the bottom of the first clamping plate (21).

7. The negative clearance value measuring device of a ball hub bearing according to claim 1, characterized in that: The bottom end of the operating table (1) is fixedly connected to a support leg (28), and the support leg (28) is fixedly connected to the four sides of the bottom end of the operating table (1) near the corners. The bottom end of the operating table (1) is fixedly connected to a limit frame (29), and the inner side of the limit frame (29) is fixedly connected to a rubber pad (30), and the rubber pad (30) covers the inner side of the limit frame (29). The position of the bottom end of the rubber pad (30) is on the same horizontal line as the position of the bottom end of the support leg (28).

8. The negative clearance value measuring device of a ball hub bearing according to claim 1, characterized in that: A power supply module (26) is installed at the top of the operating table (1), and a control module (27) is installed at the top of the operating table (1). The power supply module (26) is connected to the control module (27) and the telescopic cylinder (20) in an electrical circuit, and the control module (27) is connected to the telescopic cylinder (20) in an electrical control manner.

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