Polishing device for automobile hub

Abstract

The invention discloses an automobile hub polishing device, which relates to the technical field of automobile part processing equipment, and comprises a base, a rack, a feeding mechanism, a conveying mechanism, a clamping mechanism, a polishing mechanism and a lifting mechanism, the feeding mechanism drives the clamping mechanism to move, the clamping mechanism drives two moving blocks to move reversely through a clamping motor, a worm, a worm gear, a driving gear and a rack, stable clamping of a hub is achieved through cooperation of an air cylinder, an arc-shaped plate and a clamping wheel, and a supporting roller assists in supporting and avoids surface scratching. The grinding mechanism drives a second lead screw and a third lead screw with opposite thread rotating directions through a second lead screw motor, two grinding wheels are driven to be close to or away from each other synchronously, hubs with different widths are adapted, and a spring plays a role in buffering protection; the lifting mechanism transfers the polished hub to the conveying mechanism, and automatic connection of feeding, polishing and conveying is achieved.

Description

Technical Field

[0001] This invention relates to the field of automotive wheel hub technology, and more specifically, to a grinding device for automotive wheel hubs. Background Technology

[0002] During the production and processing of automobile wheels, their surfaces need to be polished to remove burrs and impurities, ensuring the flatness and smoothness of the wheel surface to meet the requirements of subsequent assembly and use.

[0003] Existing automotive wheel grinding devices generally suffer from the following technical defects: poor adaptability to wheel hubs of different specifications, easy deviation during clamping, resulting in reduced grinding accuracy and affecting the quality of wheel hub processing. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a grinding device for automobile wheel hubs.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention discloses a grinding device for automobile wheel hubs, comprising a base, two frames, a feeding mechanism, a conveying mechanism, a clamping mechanism, a grinding mechanism, and a lifting mechanism. The two frames are mounted on the base, and the conveying mechanism is also mounted on the base. A feeding platform is mounted on one frame, and the grinding mechanism is mounted on the other frame. The feeding mechanism is located above the conveying mechanism and is driven by the clamping mechanism. The lifting mechanism is positioned in front of the grinding mechanism. The clamping mechanism includes a central block and two movable blocks located on either side of the central block. A support plate is connected to the side of each movable block closest to the central block, and the support plate is inserted into the central block. Next, a connecting block is connected to the upper part of the moving block, and a rack is connected to the connecting block. A clamping motor is installed on the middle block, and a worm gear is driven by the clamping motor. The worm gear meshes with a worm wheel, and a drive gear is coaxially connected to the worm wheel. Two racks are located on both sides of the drive gear and mesh with the drive gear. A vertical plate is connected to the lower part of the moving block, and a clamping component is installed on the vertical plate. Several support rollers are rotatably arranged on the lower inner side of the vertical plate, and a gap is left between the ends of the support rollers on both sides. The lifting mechanism can extend between the ends of the support rollers on both sides to transport the polished wheel hub on the clamping mechanism to the conveying mechanism, which then transports it away.

[0007] Furthermore, the clamping component includes a cylinder mounted on a vertical plate. The cylinder drives an arc-shaped plate, on which at least two clamping wheels are mounted. The clamping wheels are rotatably connected to the arc-shaped plate.

[0008] Furthermore, a guide block two is connected to the lower part of the middle block, and a guide rod is connected to the inner side of the vertical plate, with part of the guide rod passing through the guide block two.

[0009] Furthermore, the material handling mechanism includes a lead screw motor mounted on the frame, a lead screw motor driving a lead screw, a lead screw slider mounted on the intermediate block, and a slide bar connecting the two frames. A slider is connected to the upper part of the intermediate block and is slidably mounted on the slide bar.

[0010] Furthermore, the lifting mechanism includes a telescopic rod, which is driven to a support frame. A support rod is mounted on the support frame and can extend between the ends of the support rollers on both sides.

[0011] Furthermore, the conveying mechanism includes two side plates 1 and two side plates 2, the two side plates 2 are installed between the two side plates 1, a plurality of conveying rollers 2 are rotatably arranged between the side plates 2 and the side plates 1, a plurality of conveying rollers 1 are rotatably arranged between the two side plates 1, and a lifting mechanism is arranged between the two side plates 2.

[0012] Furthermore, the grinding mechanism includes a fixed frame, on the upper part of which a lead screw motor 2 is mounted, leading screw 2 is driven and connected to lead screw 3, and lead screw 2 and lead screw 3 are connected to the lower end of lead screw 2. The threads of lead screw 2 and lead screw 3 have opposite directions, and each lead screw 2 and lead screw 3 is mounted with a lead screw slider 2. The grinding mechanism also includes two wheel frames, on which grinding wheels are mounted, and the two wheel frames are respectively mounted on two lead screw sliders 2. A mounting table is mounted on the grinding mechanism, and a drive wheel is rotatably mounted on the mounting table. A drive motor is installed inside the mounting table, and the drive motor drives the drive wheel via a belt drive.

[0013] Furthermore, a connecting rod is connected to the lead screw slider two, and a mounting bracket is installed on the connecting rod. A guide post is connected to the side of the mounting bracket near the wheel frame. A sleeve is connected to the wheel frame, and the sleeve is fitted onto the guide post. A retaining ring is connected to the inner wall of the sleeve. The guide post passes through the retaining ring and is fitted with a spring. One end of the spring abuts against the retaining ring, and the other end abuts against the mounting bracket.

[0014] Furthermore, a guide groove is provided on the inner wall of the sleeve, the guide groove is arranged along the axial direction of the sleeve, and the guide post passes through the outer periphery of the retaining ring and is connected to the guide block three, the guide block three being slidably arranged in the guide groove.

[0015] Furthermore, a guide hole is provided on the outer periphery of the fixing frame, and a guide block is connected to the mounting frame, with the end of the guide block passing through the guide hole.

[0016] The beneficial effects of this invention are: through the transmission and cooperation of the clamping motor, worm, worm wheel, drive gear and rack, the two moving blocks are driven to move synchronously in opposite directions. With the clamping action of the cylinder, arc plate and clamping wheel, different specifications of wheel hubs can be stably clamped; the support roller provides auxiliary support to the wheel hub, and the clamping wheel rolls in contact with the wheel hub to avoid surface scratches. Attached Figure Description

[0017] Figure 1This is a schematic diagram of a grinding device for automobile wheel hubs in this embodiment;

[0018] Figure 2 This is a schematic diagram of one structure of the clamping mechanism in this embodiment;

[0019] Figure 3 This is a top view of the clamping mechanism in this embodiment;

[0020] Figure 4 This is a schematic diagram of one structure of the conveying mechanism in this embodiment;

[0021] Figure 5 This is a schematic diagram of one structure of the grinding mechanism in this embodiment;

[0022] Figure 6 for Figure 5 Enlarged diagram of point A in the middle.

[0023] Reference numerals: 1. Base; 2. Frame; 3. Feeding mechanism; 4. Clamping mechanism; 5. Grinding mechanism; 6. Conveying mechanism; 7. Lifting mechanism; 8. Feeding platform; 9. Guide hole; 10. Guide block one; 11. Telescopic rod; 12. Support frame; 13. Support rod; 14. Intermediate block; 15. Moving block; 16. Support plate; 17. Vertical plate; 18. Support roller; 19. Cylinder; 20. Arc plate; 21. Clamping wheel; 22. Guide block two; 23. Guide rod; 24. Lead screw motor one; 25. Lead screw one; 26. Lead screw slider one; 27. Slider; 28. Slide rod; 2 9. Connecting block; 30. Rack; 31. Clamping motor; 32. Worm gear; 33. Worm wheel; 34. Drive gear; 35. Side plate one; 36. Conveyor roller one; 37. Side plate two; 38. Conveyor roller two; 39. Fixing frame; 40. Lead screw motor two; 41. Lead screw two; 42. Lead screw three; 43. Lead screw slider two; 44. Wheel frame; 45. Grinding wheel; 46. Mounting frame; 47. Connecting rod; 48. Sleeve; 49. Guide column; 50. Guide groove; 51. Guide block three; 52. Retaining ring; 53. Spring; 54. Mounting platform; 55. Drive wheel; 56. Drive motor. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] like Figures 1-6As shown, a grinding device for automobile wheel hubs includes a base 1, two frames 2, a feeding mechanism 3, a conveying mechanism 6, a clamping mechanism 4, a grinding mechanism 5, and a lifting mechanism 7. The two frames 2 are symmetrically mounted on the top sides of the base 1, and the conveying mechanism 6 is horizontally mounted on the top of the base 1. A feeding platform 8 is installed on the inner wall of one frame 2 for placing the automobile wheel hub to be ground, and the grinding mechanism 5 is installed on the inner wall of the other frame 2.

[0026] The feeding mechanism 3 is mounted above the conveying mechanism 6. The feeding mechanism 3 includes a lead screw motor 24 bolted to the top of the frame 2. The output shaft of the lead screw motor 24 is driven by a lead screw 25 via a coupling. The two ends of the lead screw 25 are rotatably mounted between the two frames 2 via bearing seats. The clamping mechanism 4 includes an intermediate block 14. A lead screw slider 26 is welded to the upper part of the intermediate block 14. The lead screw slider 26 is threaded onto the lead screw 25. A sliding rod 28 is also welded between the two frames 2. Rod 28 is set parallel to lead screw 25. A slider 27 is welded to the upper part of the middle block 14. The slider 27 is slidably sleeved on the slide rod 28. The lead screw 25 is driven to rotate by the lead screw motor 24, which drives the lead screw slider 26 to move along the axial direction of the lead screw 25. With the guiding effect of slider 27 and slide rod 28, the clamping mechanism 4 can move smoothly, avoiding the positioning deviation caused by the hub shaking during the feeding process. The self-locking property of the lead screw transmission can also ensure that the clamping mechanism 4 maintains a fixed position during the grinding process.

[0027] The clamping mechanism 4 also includes two symmetrically arranged movable blocks 15, located on the front and rear sides of the middle block 14 respectively. A support plate 16 is integrally formed on the side of each movable block 15 closest to the middle block 14. Slots matching the support plate 16 are correspondingly opened on the left and right sides of the middle block 14, allowing the support plate 16 to be inserted into the slots for connection. A connecting block 29 is bolted to the upper part of each movable block 15. A rack 30 is welded to the inner wall of the connecting block 29. A clamping motor 31 is mounted on the top of the middle block 14 via a motor mount. The output shaft of the clamping motor 31 is driven by a worm gear 32 via a coupling. The worm gear 32 meshes with a worm wheel 33, which is coaxially fixed to a drive gear 34. Two racks 30 are located on either side of the drive gear 34 and mesh with it. Utilizing the reduction characteristics and self-locking function of the worm gear and worm wheel, the two movable blocks 15 move synchronously and in opposite directions with precise movement, controlling the displacement error within 0.1mm and ensuring uniform clamping force on both sides. Meanwhile, the meshing transmission between the rack 30 and the drive gear 34 avoids the leakage risk of traditional hydraulic drive and the instability problem of pneumatic drive, greatly improving the reliability of the clamping mechanism 4.

[0028] A vertical plate 17 is welded to the lower part of the moving block 15. A clamping component is installed on the vertical plate 17, including a cylinder 19 bolted to the outer wall of the vertical plate 17. The piston rod of the cylinder 19 passes through a through hole in the vertical plate 17 and drives an arc-shaped plate 20. A clamping wheel 21 is installed on the inner wall of the arc-shaped plate 20. The clamping wheel 21 is rotatably connected to the arc-shaped plate 20 via a pin. Several support rollers 18 are also rotatably mounted on the lower part of the inner wall of the vertical plate 17 via bearings. The support rollers 18 provide multi-point auxiliary support to the bottom of the hub, dispersing the weight of the hub. The rolling characteristics of the support rollers 18 do not affect the rotation of the hub during grinding, ensuring the smoothness of the grinding process. A gap is left between the ends of the support rollers 18 on both sides for the lifting mechanism 7 to extend into. The hub to be ground is placed on the feeding table 8, which supports the middle position of the bottom of the hub. The lead screw motor 24 is started, driving the clamping mechanism 4 to move to the feeding table 8. The clamping motor 31 is started, driving the drive gear 34 to rotate via the worm gear 32 and worm wheel 33. This drives the two moving blocks 15 to move closer together via the rack 30, bringing the support roller 18 to the lower part of the hub and achieving initial positioning. The cylinder 19 is then activated, pushing the arc plate 20 and the clamping wheel 21 towards the hub. The clamping wheel 21 abuts against the outer circumference of the hub, completing the clamping and fixing. Each arc plate 20 has at least two clamping wheels 21, which not only achieves automatic centering of the hub but also replaces traditional rigid clamping with rolling contact of the clamping wheels 21, avoiding scratches on the hub surface during clamping.

[0029] A guide block 22 is welded to the lower part of the middle block 14, and a guide rod 23 is welded to the inner wall of the vertical plate 17. One end of the guide rod 23 passes through the guide hole on the guide block 22 and slides in fit. The cooperation between the guide rod 23 and the guide block 22 forms a secondary guide, which further constrains the movement trajectory of the moving block 15, prevents the moving block from tilting or deviating during the clamping process, and ensures that the two vertical plates 17 remain parallel at all times. This provides a guarantee for the accurate positioning of the clamping wheel 21 and indirectly improves the grinding accuracy.

[0030] The lead screw motor 24 rotates in the opposite direction, driving the clamping mechanism 4 and the clamped wheel hub to move to the grinding mechanism 5.

[0031] The grinding mechanism 5 includes a fixed frame 39, which is vertically mounted on the frame 2 by bolts. A lead screw motor 40 is mounted on the upper part of the fixed frame 39 via a motor mount. The output shaft of the lead screw motor 40 is driven by a lead screw 41 via a coupling. A lead screw 42 is integrally formed at the lower end of the lead screw 41. The threads of the lead screws 41 and 42 have opposite directions, and a lead screw slider 43 is threaded onto each. A connecting rod 47 is welded to the outer wall of the lead screw slider 43. A mounting bracket 46 is fixedly mounted on the outer end of the connecting rod 47. A guide post 49 is welded to the side of the mounting bracket 46 near the wheel frame 44. A sleeve 48 is welded to the inner wall of the wheel frame 44. The sleeve 48 is slidably fitted onto the outside of the guide post 49. A retaining ring 52 is welded to the inner wall of the sleeve 48. The guide post 49 passes through the retaining ring 52 and is slidably fitted. A spring 53 is fitted onto the guide post 49, located between the mounting bracket 46 and the retaining ring 52. The buffering effect of the spring 53 can absorb the vibration and impact generated during the grinding process, avoiding surface scratches or damage to the grinding wheel caused by rigid collision between the grinding wheel 45 and the wheel hub. At the same time, the preload of the spring 53 can ensure stable contact between the grinding wheel 45 and the surface of the wheel hub, solving the problems of uneven grinding and easy scratches, and extending the service life of the grinding wheel 45. A guide groove 50 is formed on the inner wall of the sleeve 48 along the axial direction. A guide block 51 is welded to the outer periphery of the part of the guide post 49 that passes through the retaining ring 52. The guide block 51 is slidably fitted with the guide groove 50. The engagement between the guide post 49 and the sleeve 48 restricts the radial displacement of the wheel frame 44, ensuring that the grinding wheel 45 always feeds radially along the hub. A guide hole 9 is provided on the outer peripheral wall of the fixed frame 39, and a guide block 10 is welded to the outer outer wall of the mounting frame 46. The end of the guide block 10 passes through the guide hole 9 and slides into it. The engagement between the guide block 10 and the guide hole 9 provides additional guidance for the movement of the mounting frame 46, preventing the mounting frame 46 from tilting under the screw drive, ensuring consistent grinding on both sides of the hub, and improving product processing consistency. The grinding wheel 45 is bolted to the wheel frame 44, and the shape of the grinding wheel 45 is designed according to the outer edge shape of the hub. Two wheel frames 44 are respectively mounted on two screw sliders 43. A mounting platform 54 is mounted on one side of the grinding mechanism 5, and a drive wheel 55 is rotatably mounted on the mounting platform 54. A drive motor 56 is installed inside the mounting platform 54, and the drive motor 56 is connected to the drive wheel 55 via a belt.

[0032] The positions of the two grinding wheels 45 are pre-adjusted so that they correspond to the outer edge of the hub. Specifically, the second lead screw motor 40 is started, driving the second lead screw 41 and the third lead screw 42 to rotate, causing the two grinding wheels 45 to move closer or further apart. The hub on the clamping mechanism 4 contacts the grinding wheels 45, and the drive motor 56 is started, driving the drive wheel 55 to rotate the hub, allowing the grinding wheels 45 to fully grind the outer edge of the hub. After a certain period of use, the grinding wheels 45 will wear down; their angle can be adjusted by rotating them, utilizing the remaining portion for further grinding.

[0033] The lifting mechanism 7 includes a telescopic rod 11, which is vertically mounted on the base 1 by bolts. The telescopic end of the telescopic rod 11 is connected to a support frame 12 by bolts. Several support rods 13 are welded to the top of the support frame 12. The upper end of the support rod 13 is arc-shaped and can extend into the gap between the two support rollers 18. The arc-shaped design of the support rod 13 matches the bottom contour of the wheel hub, avoiding indentations on the surface of the wheel hub during the lifting process; its precise fit between the support rollers 18 enables interference-free material handling.

[0034] The conveying mechanism 6 includes two side plates 35 and two side plates 37. The two side plates 35 are symmetrically mounted on the base 1, and the two side plates 37 are mounted between the two side plates 35. A plurality of conveying rollers 38 are rotatably arranged between the side plates 37 and the side plates 35, and a plurality of conveying rollers 36 are rotatably arranged between the two side plates 35. The lifting mechanism 7 is located between the two side plates 37. Adjacent conveying rollers 36 are connected by belt drive, adjacent conveying rollers 38 are connected by belt drive, and adjacent conveying rollers 36 and 38 are also connected by belt drive. A motor is connected to drive one of the conveying rollers 36 or 38, thereby driving all the conveying rollers 36 and 38 to rotate, thus conveying the hub. The combined layout of the conveying rollers 36 and 38 covers the support surface of the hub, avoiding hub tilting caused by single-point support.

[0035] After grinding, the telescopic rod 11 is activated, and the support rod 13 rises to lift the hub. The cylinder 19 retracts to release the hub, and the clamping motor 31 rotates in the opposite direction to move the moving blocks 15 away from each other, causing the support roller 18 to disengage from under the hub. The telescopic rod 11 retracts, causing the hub to disengage from the clamping mechanism 4 and be lowered onto the conveying mechanism 6. The first conveying roller 36 and the second conveying roller 38 rotate to transport the hub to the next process, completing one grinding cycle.

[0036] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A grinding device for automobile wheel hubs, characterized in that, The system includes a base (1), two frames (2), a feeding mechanism (3), a conveying mechanism (6), a clamping mechanism (4), a grinding mechanism (5), and a lifting mechanism (7); the two frames (2) are mounted on the base (1), the conveying mechanism (6) is mounted on the base (1), one of the frames (2) is equipped with a feeding platform (8), and the other frame (2) is equipped with a grinding mechanism (5); the feeding mechanism (3) is located above the conveying mechanism (6), the feeding mechanism (3) drives and connects to the clamping mechanism (4), and the lifting mechanism (7) is located in front of the grinding mechanism (5); the clamping mechanism (4) includes a middle block (14) and two moving blocks (15), the moving blocks (15) are located on both sides of the middle block (14), the side of the moving blocks (15) close to the middle block (14) is connected to a support plate (16), the support plate (16) is inserted and connected to the middle block (14), and the moving blocks (15) are connected to the middle block (14). The upper part is connected to a connecting block (29), and a rack (30) is connected to the connecting block (29). A clamping motor (31) is installed on the middle block (14). The clamping motor (31) drives a worm gear (32). The worm gear (32) meshes with a worm wheel (33). The worm wheel (33) is coaxially connected to a drive gear (34). The two racks (30) are located on both sides of the drive gear (34) and mesh with the drive gear (34). The lower part of the moving block (15) is connected to a vertical plate (17), and a clamping component is installed on the vertical plate (17). Several support rollers (18) are rotatably arranged on the lower inner side of the vertical plate (17), and a gap is left between the ends of the support rollers (18) on both sides. The lifting mechanism (7) can extend into the gap between the ends of the support rollers (18) on both sides to transport the polished wheel hub on the clamping mechanism (4) to the conveying mechanism (6), and the conveying mechanism (6) will transport it away.

2. The grinding device for automobile wheel hubs according to claim 1, characterized in that, The clamping component includes a cylinder (19), which is mounted on the vertical plate (17). The cylinder (19) drives an arc plate (20) which is connected to it. At least two clamping wheels (21) are mounted on the arc plate (20), and the clamping wheels (21) are rotatably connected to the arc plate (20).

3. The grinding device for automobile wheel hubs according to claim 1, characterized in that, The lower part of the middle block (14) is connected to the second guide block (22), and the inner side of the vertical plate (17) is connected to the guide rod (23). One end of the guide rod (23) passes through the second guide block (22).

4. The grinding device for automobile wheel hubs according to claim 1, characterized in that, The feeding mechanism (3) includes a lead screw motor (24) mounted on the frame (2), the lead screw motor (24) drives a lead screw (25), a lead screw slider (26) is mounted on the intermediate block (14), and the lead screw slider (26) is mounted on the lead screw (25); a slide bar (28) is connected between the two frames (2), and a slider (27) is connected to the upper part of the intermediate block (14), and the slider (27) is slidably mounted on the slide bar (28).

5. The grinding device for automobile wheel hubs according to claim 1, characterized in that, The lifting mechanism (7) includes a telescopic rod (11), which is driven to connect to a support frame (12). A support rod (13) is installed on the support frame (12), and the support rod (13) can extend between the ends of the support rollers (18) on both sides.

6. The grinding device for automobile wheel hubs according to claim 1, characterized in that, The conveying mechanism (6) includes two side plates (35) and two side plates (37). The two side plates (37) are installed between the two side plates (35). A plurality of conveying rollers (38) are rotatably arranged between the side plates (37) and the side plates (35). A plurality of conveying rollers (36) are rotatably arranged between the two side plates (35). The lifting mechanism (7) is arranged between the two side plates (37).

7. The grinding device for automobile wheel hubs according to claim 1, characterized in that, The grinding mechanism (5) includes a fixed frame (39), on which a second lead screw motor (40) is mounted. The second lead screw motor (40) drives a second lead screw (41). The lower end of the second lead screw (41) is connected to a third lead screw (42). The threads of the second lead screw (41) and the third lead screw (42) have opposite directions. A second lead screw slider (43) is mounted on each of the second lead screw (41) and the third lead screw (42). The grinding mechanism (5) also includes Two wheel frames (44) are provided with grinding wheels (45), and the two wheel frames (44) are respectively installed on the two lead screw sliders (43); a mounting platform (54) is installed on the fixing frame (39) of the grinding mechanism (5), and a drive wheel (55) is rotatably provided on the mounting platform (54). A drive motor (56) is installed in the mounting platform (54), and the drive motor (56) drives the drive wheel (55) through a belt drive.

8. The grinding device for automobile wheel hubs according to claim 7, characterized in that, A connecting rod (47) is connected to the lead screw slider (43). A mounting bracket (46) is installed on the connecting rod (47). A guide post (49) is connected to the side of the mounting bracket (46) near the wheel frame (44). A sleeve (48) is connected to the wheel frame (44). The sleeve (48) is fitted onto the guide post (49). A retaining ring (52) is connected to the inner wall of the sleeve (48). The guide post (49) passes through the retaining ring (52). A spring (53) is fitted onto the guide post (49). One end of the spring (53) abuts against the retaining ring (52), and the other end abuts against the mounting bracket (46).

9. The grinding device for automobile wheel hubs according to claim 8, characterized in that, The inner wall of the sleeve (48) is provided with a guide groove (50), the guide groove (50) is arranged along the axial direction of the sleeve (48), the guide post (49) passes through the outer periphery of the retaining ring (52) and is connected to a guide block three (51), the guide block three (51) is slidably arranged in the guide groove (50).

10. The grinding device for automobile wheel hubs according to claim 7, characterized in that, The fixing frame (39) has a guide hole (9) on its outer periphery, and a guide block (10) is connected to the mounting frame (46). The end of the guide block (10) passes through the guide hole (9).

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