Multi-angle floating grinding mechanism for abrasive belt grinding equipment

Abstract

The utility model relates to a multi-angle floating polishing mechanism for abrasive belt polishing equipment, which comprises a polishing base and a polishing wheel, the polishing wheel comprises a polishing hub with an inner groove in the center, a connecting arm is arranged on one side of the polishing hub, one end of the connecting arm is connected with the polishing base, and the other end of the connecting arm is connected with the polishing hub through a receding plate. The receding plate comprises a receding connecting plate and a mounting plate, the polishing hub is rotatably connected to the receding connecting plate, the receding connecting plate is contained in the inner groove, one end of the receding connecting plate is connected with the center of the polishing hub, and the other end of the receding connecting plate partially extends in the outer diameter direction of the polishing hub and then is connected with the mounting plate. Therefore, an avoiding space is formed between the center and the outer side of the grinding hub, interference of the grinding base to a workpiece or a mechanical arm in the grinding process is avoided, the workpiece to be ground or the mechanical arm can conduct grinding operation in the avoiding space, and multi-angle and multi-dead-angle grinding is achieved.

Description

Technical Field

[0001] This utility model relates to the field of belt sanders, and in particular to a multi-angle floating sanding mechanism for belt sanding equipment. Background Technology

[0002] A belt sander is a device that uses a sanding belt to polish workpieces. It is driven by a motor to move the belt, using abrasive particles on the belt to cut and scratch the workpiece surface, removing excess material, burrs, etc., achieving the effects of sanding and polishing. Its structure includes a frame, belt wheel assembly, tensioning mechanism, and drive mechanism, and it is applicable to various fields such as metal, wood, stone, automobile manufacturing, and electronics industries, used to improve workpiece surface quality and processing precision.

[0003] For example, Chinese utility model patent CN208084054U discloses a dual-station belt sanding system for grinding hammers, including a belt sanding mechanism, a loading and unloading mechanism, a transport robot, and a control mechanism. The belt sanding mechanism, loading and unloading mechanism, and transport robot are electrically connected to the control mechanism. The belt sanding mechanism includes two or more sets of belt sanding components. The belt sanding components are movably arranged relative to the sanding support, and a force control device is provided between the belt sanding components and the sanding support. The loading and unloading mechanism includes a loading and unloading worktable, on which two or more loading and unloading pushing devices are provided. Each loading and unloading pushing device is equipped with a detachable storage tray. The loading and unloading pushing devices drive the storage tray to move back and forth, and several hammer workpieces are placed on the storage tray. This utility model has the characteristics of high automation, high sanding efficiency, good sanding quality, convenient operation, low labor intensity, low labor cost, reliable performance, good sanding consistency, effective improvement of production efficiency, high working stability, and high safety factor.

[0004] In the above technical solution, the belt abrasive assembly includes a grinding motor B3, a grinding wheel B6, a belt body B7, a driven wheel B8, a grinding base B14, and a grinding guide post B15. The grinding motor B3 is connected to the grinding wheel B6 and drives it to rotate. Specifically, a first transmission wheel B4 is provided on the output shaft of the grinding motor B3, and a second transmission wheel (not shown in the figure) is coaxially connected to the grinding wheel B6. A transmission belt B5 is wound between the first transmission wheel B4 and the second transmission wheel, thereby enabling the grinding motor B3 to rotate. The transmission connection between the grinding wheel B6 and the grinding wheel B6 is as follows: the sanding belt body B7 is wound around the grinding wheel B6 and the driven wheel B8; the grinding motor B3 is fixed on the grinding base B14; the grinding wheel B6 is positioned and rotated relative to the grinding base B14; one end of the grinding guide post B15 is adjustablely sliding inside the grinding base B14; the driven wheel B8 is located on the other end of the grinding guide post B15; the top of the movable rocker arm B9 rotates on the grinding base B14; the other end of the first force-control elastic element B12 is connected to the grinding base B14, such as... Figure 4As shown, in existing grinding systems, the grinding wheel B6 is typically positioned and rotated relative to the grinding base B14. While this structure can achieve basic grinding functions, the flush and fixed setting of the grinding wheel B6 causes interference between the grinding base B14 and the workpiece or robotic arm when grinding the dead corners of the workpiece. This interference not only limits the flexibility of the grinding operation but also leads to insufficient grinding of the dead corners, affecting the final quality of the workpiece. Furthermore, since the grinding wheel B6 lacks a floating function, the contact pressure and angle between the abrasive belt and the workpiece are difficult to maintain a constant. This instability can easily lead to over-grinding during the workpiece grinding process, causing workpiece wear and affecting product consistency and quality. Similarly, due to the fixed setting of the grinding wheel and the interference problem, more constraints need to be considered during programming, increasing the complexity and difficulty of programming. This not only raises the technical requirements for operators but also reduces production efficiency. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a multi-angle floating grinding mechanism for belt sanding equipment, which addresses the shortcomings of the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a multi-angle floating grinding mechanism for belt sanding equipment, comprising a grinding base and a grinding wheel. The grinding wheel includes a grinding hub with an inner groove at its center. A connecting arm is provided on one side of the grinding hub. One end of the connecting arm is connected to the grinding base, and the other end is connected to the grinding hub through a clearance plate. The clearance plate includes a clearance connecting plate connected to the center of the inner groove of the grinding hub and a mounting plate that extends out of the inner groove of the grinding hub after being bent and connected to the connecting arm. The grinding hub is rotatably connected to the clearance connecting plate. The clearance connecting plate is accommodated in the inner groove, and one end is connected to the center of the grinding hub. The other end extends partially along the outer diameter of the grinding hub and connects to the mounting plate, thereby forming a clearance space between the center and the outer side of the grinding hub.

[0007] The above technical solution features an inner groove at the center of the grinding hub, allowing for greater side clearance without increasing the hub's width. The clearance plate includes a clearance connecting plate and a mounting plate. The clearance connecting plate is located within the inner groove of the grinding hub and connected to the hub's center. Its other end extends along the outer diameter of the grinding hub and connects to the mounting plate. This shifts the original interference point (the raised center point) significantly back, creating a clearance space. This avoids interference between the grinding base and the workpiece or robotic arm during grinding, allowing the workpiece or robotic arm to perform grinding operations within the clearance space. This enables multi-angle, multi-dead-angle grinding, improving the flexibility and adaptability of the grinding operation, thus enhancing the comprehensiveness and uniformity of the grinding. Furthermore, this design simplifies the programming of grinding actions, reduces the technical requirements for operators, and improves production efficiency. Its unique structural layout achieves higher grinding quality and efficiency while ensuring ease of operation and equipment stability, adapting to the grinding needs of workpieces with different shapes, especially for fine grinding of complex curved surfaces or dead-angle areas.

[0008] The multi-angle floating grinding mechanism for the above-mentioned belt sanding equipment can be further configured as follows: a hub rotating shaft is provided on the clearance connecting plate, the hub rotating shaft passes through the grinding hub and is connected to the hub axle cover, a hub axle sleeve is provided between the hub rotating shaft and the grinding hub, and a first limiting ring seat is provided at the end of the hub axle sleeve away from the hub axle cover. The first limiting ring seat cooperates with the hub axle cover to restrict the grinding hub to rotate on the hub rotating shaft.

[0009] Using the above technical solution, a hub rotation shaft is bolted to the clearance connecting plate. This shaft passes through the grinding hub and is bolted to the hub axle cap, allowing the grinding hub to rotate around the hub rotation shaft and perform the grinding action. A hub axle sleeve is provided between the hub rotation shaft and the grinding hub. The hub axle sleeve supports the hub rotation shaft, reduces direct friction, protects the hub and the rotation shaft, and provides stable rotational support. Simultaneously, a first limiting ring seat is provided at the end of the hub axle sleeve away from the hub axle cap, which engages with the hub axle cap to restrict the grinding hub's rotation on the hub rotation shaft, preventing hub movement and ensuring the stability and precision of the grinding process. This ensures a smooth and uniform grinding process and avoids grinding quality degradation or equipment damage caused by unstable hub rotation.

[0010] The multi-angle floating grinding mechanism for the aforementioned belt sander can be further configured as follows: a first bearing and a second bearing are provided between the hub rotating shaft and the hub bushing; a first bearing limiting part is provided at the end of the hub rotating shaft away from the hub bushing cover; a first inner ring separating ring is provided between the first bearing and the second bearing; the inner rings of the first and second bearings are installed on the hub rotating shaft, and the outer rings are installed on the inner wall of the hub bushing; a first outer ring separating ring is provided on the inner wall of the hub bushing corresponding to the first separating ring.

[0011] The above technical solution incorporates two bearings between the hub shaft and the hub sleeve. This dual-bearing structure provides more stable support and load-bearing capacity, helping to reduce friction and improve rotational smoothness. A first bearing limiting part is located at the end of the hub shaft furthest from the hub cover. This limiting part restricts the movement of the bearing on the hub shaft, ensuring correct bearing positioning. A first inner ring separator is located between the first and second bearings to maintain the distance between the inner rings and prevent them from contacting or interfering with each other. A first outer ring separator is located on the inner wall of the hub sleeve corresponding to the first separator ring, further restricting the position of the outer ring of the bearing and preventing its movement within the sleeve. This achieves stable support and precise positioning of the hub shaft. This structure not only reduces friction during hub shaft rotation but also improves its rotational smoothness and accuracy, making belt wheel grinding smoother.

[0012] The multi-angle floating grinding mechanism for the above-mentioned belt sanding equipment can be further configured as follows: a grinding base plate is provided at the corresponding connecting arm of the grinding base, the connecting arm is rotatably mounted on the grinding base plate, and a reset mechanism is provided at the corresponding connecting arm of the grinding base plate to reset after the connecting arm rotates.

[0013] Using the above technical solution, the grinding base plate provides a support and rotation base for the connecting arm. The connecting arm performs floating flexible grinding according to the grinding requirements to adapt to workpieces of different shapes and positions, making it easy to adapt to different grinding parts of different workpieces with different intensities, avoiding over-grinding. At the same time, after floating grinding, it returns to the initial position through the reset mechanism, which facilitates subsequent grinding.

[0014] The multi-angle floating grinding mechanism for the above-mentioned belt sanding equipment can be further configured such that: the reset mechanism includes at least one reset spring disposed at one end of the connecting arm corresponding to the grinding base plate or grinding base, one end of the reset spring being connected to the connecting arm and the other end being connected to the grinding base plate.

[0015] By adopting the above technical solution, a reset spring is set so that the movable bracket can return to its initial position after grinding, allowing different parts of the casting to be ground.

[0016] The multi-angle floating grinding mechanism for the above-mentioned belt sanding equipment can be further configured as follows: the reset mechanism includes at least one buffer disposed at the corresponding connecting arm of the grinding base plate or grinding base, wherein one of the buffers is disposed below the connecting arm, the buffer is connected to the grinding base plate, and the buffer end faces downward of the connecting arm.

[0017] Using the above technical solution, the buffer can be a hydraulic buffer, a polyurethane buffer, or a spring buffer, etc. The buffer end of the buffer faces downward of the connecting arm, so that after the connecting arm floats downward, it is reset to the top by the buffer. After floating upward, it is reset by its own gravity and restoring itself against the surface of the buffer.

[0018] The multi-angle floating grinding mechanism for the above-mentioned belt sanding equipment can be further configured as follows: one end of the connecting arm is hinged to the grinding base plate, and a floating plate is provided on the other side towards the grinding base. The grinding base plate is provided with spring buffers at both ends corresponding to the swing direction of the floating plate, and the buffer end of the spring buffer faces the direction of the floating arm.

[0019] Using the above technical solution, one end of the connecting arm is connected to the grinding base plate by a hinge, so that the connecting arm drives the floating plate to rotate freely within a certain angle range. Spring buffers are provided at both ends of the grinding base plate corresponding to the swing direction of the floating plate. The spring buffers are used to provide buffering during the up and down swing of the floating plate, absorb impact force, reduce mechanical wear, and help the floating plate to reset. This reduces direct collision and wear between mechanical parts, thereby extending the service life of the mechanism.

[0020] The multi-angle floating grinding mechanism for the aforementioned belt sander can be further configured as follows: each spring buffer includes a cylinder fixedly mounted on the grinding base plate, a piston and a buffer spring disposed within the cylinder, and a buffer adjustment plate disposed at the end of the cylinder away from the piston. The cylinder is provided with a buffer cavity for the piston to extend and retract within it. One end of the piston is provided with an anti-detachment ring that abuts against and limits the movement of the cylinder. The buffer adjustment plate is threadedly connected to the cylinder and can rotate to approach or move away from the piston. One end of the buffer spring abuts against the piston, and the other end abuts against the buffer adjustment plate, applying a preload force to the piston in the direction of the floating arm.

[0021] Using the above technical solution, the piston is prevented from coming off the cylinder from the buffer end by the anti-disengagement ring. The piston can move telescopically within the cylinder. One end of the buffer spring abuts against the piston, and the other end abuts against the buffer adjustment plate, providing a restoring force to the piston and allowing the piston to extend and retract within the piston cavity when under force. The buffer adjustment plate is threadedly connected to the cylinder and can be rotated to move closer to or further away from the piston, thereby conveniently adjusting the preload of the buffer spring to adapt to different working requirements.

[0022] The multi-angle floating grinding mechanism for the above-mentioned belt sanding equipment can be further configured as follows: a floating rotating shaft is provided on the grinding base plate, the floating rotating shaft passes through the connecting arm and is connected to the floating shaft cover, a floating shaft sleeve is provided between the floating rotating shaft and the connecting arm, and a second limiting ring seat is provided at the end of the floating shaft sleeve away from the floating shaft cover. The second limiting ring seat cooperates with the floating shaft cover to restrict the connecting arm to rotate on the floating rotating shaft.

[0023] Using the above technical solution, a floating rotating shaft is fixedly installed on the grinding base plate by bolts. This shaft passes through the connecting arm and is fastened to the floating shaft cover by bolts, allowing the connecting arm to rotate around the floating rotating shaft and perform the grinding action. A floating bushing is provided between the floating rotating shaft and the connecting arm. The function of the floating bushing is to support the floating rotating shaft, reduce direct friction, protect the connecting arm and the rotating shaft, and provide stable rotational support. At the same time, a second limiting ring seat is provided at the end of the hub bushing away from the floating shaft cover, which cooperates with the floating shaft cover to restrict the connecting arm to float up and down on the floating rotating shaft, preventing the connecting arm from sliding along the surface of the floating rotating shaft, ensuring the stability and accuracy of the floating process, and ensuring the stability of the flexible grinding mechanism.

[0024] The multi-angle floating grinding mechanism for the above-mentioned belt sander can be further configured as follows: a third bearing and a fourth bearing are provided between the floating rotating shaft and the floating bushing; a second bearing limiting part is provided at the end of the floating rotating shaft away from the floating shaft cover; a second inner ring separating ring is provided between the third bearing and the fourth bearing; the inner rings of the third and fourth bearings are installed on the floating rotating shaft, and the outer rings are installed on the inner wall of the floating bushing; a second outer ring separating ring is provided on the inner wall of the floating bushing corresponding to the second separating ring.

[0025] The above technical solution incorporates two bearings between the floating rotating shaft and the floating bushing. This dual-bearing structure provides more stable support and load-bearing capacity, helping to reduce friction and improve rotational smoothness. A second bearing limiting part is located at the end of the floating rotating shaft furthest from the floating bushing cover. This limiting part restricts the movement of the bearing on the floating rotating shaft, ensuring correct bearing positioning. A second inner ring separator is located between the third and fourth bearings to maintain the distance between the inner rings of the two bearings, preventing them from contacting or interfering with each other. A second outer ring separator is located on the inner wall of the floating bushing corresponding to the second separator, further restricting the position of the outer ring of the bearing and preventing it from moving within the bushing. This achieves stable support and precise positioning of the floating rotating shaft. This structure not only reduces friction during rotation but also improves the smoothness and accuracy of its rotation, making the flexible grinding process of the belt abrasive wheel smoother and more stable.

[0026] The present invention will now be further described with reference to the accompanying drawings. Attached Figure Description

[0027] Figure 1 This is a perspective view of an embodiment of the present utility model.

[0028] Figure 2 for Figure 1 Exploded view.

[0029] Figure 3 for Figure 1 explosion Figure 2 .

[0030] Figure 4 This is a connection diagram of an embodiment of the present utility model. Figure 1 .

[0031] Figure 5 This is a connection diagram of an embodiment of the present utility model. Figure 2 .

[0032] Figure 6 This is a cross-sectional schematic diagram of an embodiment of the present utility model.

[0033] Figure 7 This is a left view of an embodiment of the present utility model.

[0034] Figure 8 for Figure 7 A sectional view along line AA.

[0035] Figure 9 for Figure 8 Enlarged view of point B.

[0036] Figure 10 This is a three-dimensional schematic diagram of the spring buffer according to an embodiment of the present invention.

[0037] Figure 11 This is a schematic diagram of the grinding angle in Embodiment 1 of this utility model.

[0038] Figure 12 This is a schematic diagram of the grinding angle in Embodiment 2 of this utility model.

[0039] Figure 13 This is a schematic diagram of the grinding angle in Embodiment 3 of this utility model. Implementation

[0040] like Figures 1-10As shown, a multi-angle floating grinding mechanism for a belt sander includes a grinding base 1 and a grinding wheel 2. The grinding wheel 2 includes a grinding hub 22 with a central groove 21. A grinding base plate 3 is fixedly mounted on the grinding base 1. A connecting arm 4 is provided on one side of the grinding hub 22. The connecting arm 4 is rotatably mounted on the grinding base plate 3. One end of the connecting arm 4 is hinged to the grinding base plate 3, and the other side is provided with a floating plate 41 facing the grinding base 1. Spring buffers 5 are provided at both ends of the grinding base plate 3 corresponding to the swing direction of the floating plate 41. The buffer end of the spring buffer 5 faces the swing path of the floating arm 41 to assist the connecting arm 4 in resetting after floating grinding. One end of the connecting arm 4 is connected to the grinding base plate 3. The end of the wheel is hinged away from the floating plate 41 and connected to the grinding wheel hub 22 via a relief plate 42. The relief plate 42 includes a clearance connecting plate 421 connected to the center of the inner groove 21 of the grinding wheel hub 22 and a mounting plate 422 that extends out of the inner groove 21 of the grinding wheel hub 22 and is connected to the connecting arm 4, so that the grinding wheel hub 22 is rotatably connected to the clearance connecting plate 421. The clearance connecting plate 421 is housed in the inner groove 22, and one end is connected to the center of the grinding wheel hub 22. The other end extends along the outer diameter of the grinding wheel hub 22 and is bent at 90° before being connected to the mounting plate 422, thereby forming a clearance space C larger than the radius of the grinding wheel 2 between the center and the outer side of the grinding wheel hub 22.

[0041] like Figures 4-6 As shown, a hub rotating shaft 43 is fixedly installed on the clearance connecting plate 421. The hub rotating shaft 43 passes through the grinding hub 22 and is connected to the hub axle cover 431. A hub axle sleeve 44 is provided between the hub rotating shaft 43 and the grinding hub 22. A first limiting ring seat 441 is provided at the end of the hub axle sleeve 44 away from the hub axle cover 431. The first limiting ring seat 441 cooperates with the hub axle cover 431 to restrict the grinding hub 22 to rotate on the hub rotating shaft 43. The hub rotating shaft 43 and the wheel A first bearing 45 and a second bearing 46 are provided between the hub bushings 44. A first bearing limiting part 432 is provided at the end of the hub rotating shaft 43 away from the hub cover 431. A first inner ring separator ring 47 is provided between the first bearing 45 and the second bearing 46. The inner rings of the first bearing 45 and the second bearing 46 are installed on the hub rotating shaft 43, and the outer rings are installed on the inner wall of the hub bushings 44. A first outer ring separator ring 442 is provided on the inner wall of the hub bushings 44 corresponding to the first separator ring 47.

[0042] like Figure 2 , Figure 3 , Figure 6As shown, a floating rotating shaft 31 is provided on the grinding base plate 3. The floating rotating shaft 31 passes through the connecting arm 4 and is connected to the floating shaft cover 311. A floating shaft sleeve 32 is provided between the floating rotating shaft 31 and the connecting arm 4. A second limiting ring seat 321 is provided at the end of the floating shaft sleeve 32 away from the floating shaft cover 311. The second limiting ring seat 321 cooperates with the floating shaft cover 32 to restrict the connecting arm 4 to rotate on the floating rotating shaft 31. A third bearing 33 and a fourth bearing 34 are provided between the floating rotating shaft 31 and the floating shaft sleeve 32. A second bearing limiting part 312 is provided at the end of the floating rotating shaft 31 away from the floating shaft cover 311. A second inner ring separating ring 35 is provided between the third bearing 33 and the fourth bearing 34. The inner rings of the third bearing 33 and the fourth bearing 34 are installed on the floating rotating shaft 31, and the outer rings are installed on the inner wall of the floating shaft sleeve 32. A second outer ring separating ring 322 is provided on the inner wall of the floating shaft sleeve 32 corresponding to the second separating ring 35.

[0043] like Figure 8 , Figure 9 As shown, the spring buffer 5 includes a cylinder 51 fixedly mounted on the grinding base plate 3, a piston 52 and a buffer spring 53 disposed inside the cylinder 51, and a buffer adjustment plate 54 disposed at the end of the cylinder 51 away from the piston 52. The cylinder 51 is provided with a buffer cavity 511 for the piston 52 to extend and retract inside. One end of the piston 52 is provided with an anti-detachment ring 521 that abuts against and limits the cylinder 51. The buffer adjustment plate 54 is threadedly connected to the cylinder 51 and has an adjustment hole 541 on its surface. The preload of the buffer spring 53 can be adjusted by using a flathead screwdriver to rotate it closer to or further away from the piston 52. One end of the buffer spring 53 abuts against the piston 52, and the other end abuts against the buffer adjustment plate 54, and applies a preload to the piston 52 in the direction of the floating arm 41.

[0044] Example 1: As Figure 11 As shown, when the multi-angle floating grinding mechanism of this utility model is installed on a belt sander to grind a T-shaped workpiece 6 (such as a faucet), the industrial robot 7 fixes the water inlet 60 of the faucet 6 with a tooling fixture. When grinding the water outlet arm 62 of the faucet 6, it can grind axially up and down on the front end face of the grinding wheel 2.

[0045] Example 2: As Figure 12 As shown, when grinding the dead corner joint between the water outlet arm 62 of the faucet 6 and the main beam 61, the left side can be ground on one side of the grinding wheel 2, while the dead corner joint on the other side will interfere with the grinding wheel 2. By setting the clearance connecting plate 421 structure of this utility model, a clearance space C is formed on this side. At this time, the water outlet arm 62 can be placed in the clearance space C for grinding, which solves the interference problem and achieves precise grinding of the dead corner.

[0046] Example 3: Figure 13As shown, when grinding the dead corner joint above the main beam 61 and the inlet 60 of the faucet 6, the left side can be ground on one side of the grinding wheel 2, while the dead corner joint on the other side will interfere with the grinding wheel 2. By setting the clearance connecting plate 421 structure of this utility model, a clearance space C is formed on this side. At this time, the tooling fixture 71 of the industrial robot 7 can be placed in the clearance space C for grinding, which solves the interference problem and realizes the precise grinding of the dead corner.

Claims

1. A multi-angle floating polishing mechanism for a belt sander, comprising a polishing base and a polishing wheel, characterized in that: The polishing wheel comprises a polishing wheel hub with an inner groove in the center, a connecting arm on one side of the polishing wheel hub, one end of the connecting arm connected with the polishing base, and the other end connected with the polishing wheel hub through a let-out plate, the let-out plate comprising an empty connection plate connected with the inner groove of the polishing wheel hub and a mounting plate connected with the connecting arm after being bent and extended out of the inner groove of the polishing wheel hub, the polishing wheel hub rotatably connected with the empty connection plate, the empty connection plate accommodated in the inner groove, one end of the empty connection plate connected with the center of the polishing wheel hub, and the other end of the empty connection plate connected with the mounting plate after being partially extended along the outer diameter direction of the polishing wheel hub, so as to form a let-out space between the center and the outer side of the polishing wheel hub.

2. The multi-angle floating polishing mechanism for a belt sander according to claim 1, characterized in that: The empty connection plate is provided with a hub rotating shaft, the hub rotating shaft is connected with a hub shaft cover after passing through the polishing wheel hub, a hub shaft sleeve is arranged between the hub rotating shaft and the polishing wheel hub, a first limiting ring seat is arranged at one end of the hub shaft sleeve away from the hub shaft cover, and the first limiting ring seat is matched with the hub shaft cover to limit the polishing wheel hub to rotate on the hub rotating shaft.

3. The multi-angle floating polishing mechanism for a belt sander according to claim 2, wherein: The hub rotating shaft and the hub shaft sleeve are provided with a first bearing and a second bearing, one end of the hub rotating shaft away from the hub shaft cover is provided with a first bearing limiting part, a first inner ring separation ring is arranged between the first bearing and the second bearing, the inner rings of the first bearing and the second bearing are mounted on the hub rotating shaft, the outer rings are mounted on the inner wall of the hub shaft sleeve, and the inner wall of the hub shaft sleeve is provided with a first outer ring separation ring at the position corresponding to the first separation ring.

4. The multi-angle floating polishing mechanism for a belt sander according to any one of claims 1 to 3, characterized in that: The polishing base is provided with a polishing bottom plate corresponding to the connecting arm, and the connecting arm is rotatably arranged on the polishing bottom plate.

5. The multi-angle floating polishing mechanism for a belt sander according to claim 4, wherein: The reset mechanism comprises at least one reset tension spring arranged at one end of the polishing bottom plate or the polishing base corresponding to the connecting arm, one end of the reset tension spring connected with the connecting arm, and the other end connected with the polishing bottom plate.

6. The multi-angle floating polishing mechanism for a belt sander according to claim 4, wherein: The reset mechanism comprises at least one bumper arranged at the position corresponding to the connecting arm of the polishing bottom plate or the polishing base, one of the bumpers is a bumper arranged below the connecting arm, the bumper is connected with the polishing bottom plate, and the buffer end faces the lower side of the connecting arm.

7. The multi-angle floating polishing mechanism for a belt sander according to claim 6, wherein: One end of the connecting arm is hinged with the polishing bottom plate, the other side is provided with a floating plate at the polishing base, both ends of the polishing bottom plate corresponding to the swinging direction of the floating plate are provided with the bumper, which is a spring bumper, and the buffer end of the spring bumper faces the direction of the floating arm.

8. The multi-angle floating polishing mechanism for a belt sander according to claim 7, wherein: The spring bumper comprises a cylinder fixedly mounted on the polishing bottom plate, a piston and a buffer spring arranged in the cylinder, and a buffer adjusting plate arranged at one end of the cylinder away from the piston, the cylinder is provided with a buffer cavity for the piston to extend and retract in the cylinder, one end of the piston is provided with a anti-dropping ring abutting against the cylinder for limiting, the buffer adjusting plate is threadedly connected with the cylinder and can be rotated to approach or move away from the piston, one end of the buffer spring abuts against the piston, the other end abuts against the buffer adjusting plate, and the buffer spring applies a pre-tightening force to the piston in the direction of the floating arm.

9. The multi-angle floating polishing mechanism for a belt sander according to claim 4, wherein: The polishing bottom plate is provided with a floating rotating shaft, the floating rotating shaft is connected with a floating shaft cover through a connecting arm, a floating shaft sleeve is arranged between the floating rotating shaft and the connecting arm, a second limiting ring seat is arranged at one end of the floating shaft sleeve away from the floating shaft cover, and the second limiting ring seat cooperates with the floating shaft cover to limit the rotation of the connecting arm on the floating rotating shaft.

10. The multi-angle floating polishing mechanism for a belt sander according to claim 9, wherein: Third and fourth bearings are arranged between the floating rotating shaft and the floating shaft sleeve, a second bearing limiting part is arranged at one end of the floating rotating shaft away from the floating shaft cover, a second inner ring separation ring is arranged between the third and fourth bearings, the inner rings of the third and fourth bearings are mounted on the floating rotating shaft, the outer rings are mounted on the inner wall of the floating shaft sleeve, and the inner wall of the floating shaft sleeve is provided with a second outer ring separation ring corresponding to the second separation ring.

Images