Lightweight dual-end balanced rotary grinding mechanism

Abstract

This utility model relates to the field of grinding equipment technology, and proposes a lightweight double-end balanced rotary grinding mechanism to solve the problem of gravity imbalance at the end of the grinding wheel. It includes a first mounting base, a sanding belt wheel, a driven wheel, a sanding belt, a sanding belt wheel shaft, a driven wheel shaft, a sanding belt motor, and a rotary motor. It also includes a second mounting base, a first pulley, a second pulley, and a belt. The rotary motor is fixedly mounted on a first longitudinal mounting plate and drives the first longitudinal mounting plate and the second mounting base to rotate up and down. The sanding belt motor is fixedly mounted on the second mounting base, with its rotation shaft passing through the second mounting base. The first pulley is sleeved on the rotation shaft of the sanding belt motor, and the second pulley is fixedly sleeved on the sanding belt wheel shaft. The sanding belt wheel shaft is rotatably mounted at one end of the second mounting base, and the belt is wound around the first and second pulleys. The sanding belt wheel is fixedly mounted on the sanding belt wheel shaft, and both ends of the driven wheel shaft are fixedly mounted at the other end of the second mounting base. The sanding belt is wound around the sanding belt wheel and the driven wheel.

Description

Technical Field

[0001] This utility model relates to the field of grinding equipment technology, and in particular to a lightweight double-end balanced rotary grinding mechanism. Background Technology

[0002] Grinding equipment is widely used in surface treatment processes such as machining, workpiece polishing, and deburring. The grinding wheel is powered by a grinding drive motor, and the motor's mounting structure directly affects the equipment's operational stability and lifespan, making it a critical design element. Currently, grinding equipment generally integrates the grinding drive motor directly onto the end of the grinding wheel, creating a single unit. This compact structure and simple transmission meet the needs of basic grinding operations and are therefore widely used.

[0003] However, this structure has significant drawbacks. The motor is directly mounted at the end of the grinding wheel, significantly increasing its weight and causing uneven weight distribution and overall gravity imbalance. During high-speed operation, posture adjustments, and reciprocating movements, this gravity imbalance generates a continuous eccentric force, producing alternating shear forces on the bolts, fasteners, and support structures used for connection and fixation. With prolonged continuous operation, this continuous shear force can easily cause bolts and other fasteners to loosen, deform, or even break, leading to misalignment of the grinding wheel's installation accuracy and affecting the workpiece grinding quality. Simultaneously, the eccentric load exacerbates wear and deformation of the core structures such as bearings, frame, and supports, causing equipment vibration, abnormal noise, and accelerated aging. This not only reduces processing stability and equipment lifespan but also increases maintenance costs and downtime failure rates, impacting production continuity.

[0004] In summary, the existing grinding equipment with the motor at the end has problems such as excessive counterweight at the grinding wheel end, imbalance of equipment gravity, easy damage to fixing parts due to shearing, poor equipment stability, and short lifespan. It is difficult to meet the needs of high-precision, long-term continuous industrial grinding operations. Therefore, it is necessary to optimize and improve its structure. Utility Model Content

[0005] Therefore, in view of the above problems, this utility model proposes a lightweight double-end balanced rotary grinding mechanism to solve the problem of gravity imbalance at the end of the grinding wheel.

[0006] To solve the above-mentioned technical problems, the solution adopted by this utility model is: a lightweight double-end balanced rotary grinding mechanism, including a first mounting base, a sanding belt wheel, a driven wheel, a sanding belt, a sanding belt wheel shaft, a driven wheel shaft, a sanding belt motor, and a rotary motor. Its features include: a second mounting base, a first pulley, a second pulley, and a belt; a first longitudinal mounting plate is fixedly arranged on the first mounting base along the front-rear direction, and a second longitudinal mounting plate is fixedly arranged on the second mounting base along the front-rear direction; the rotary motor is fixedly arranged on the first longitudinal mounting plate and drives the first longitudinal mounting plate and the second mounting base to rotate up and down; the sanding belt motor is located on the second mounting base... The middle part of the seat is fixedly mounted on the second mounting base along the front-to-back direction. The rotating shaft of the sanding belt motor passes through the second mounting base. The first pulley is sleeved on the rotating shaft of the sanding belt motor. The second pulley is fixedly sleeved on the sanding belt wheel shaft. The sanding belt wheel shaft is rotatably mounted on one end of the second mounting base in a direction parallel to the rotating shaft of the sanding belt motor. The belt is wound around the first pulley and the second pulley. The sanding belt wheel is fixedly mounted on the sanding belt wheel shaft. The driven wheel is rotatably sleeved on the driven wheel shaft. Both ends of the driven wheel shaft are fixedly mounted on the other end of the second mounting base. The sanding belt is wound around the sanding belt wheel and the driven wheel.

[0007] A further improvement includes an RV reducer, which is fixed to the first longitudinal mounting plate. The rotary motor is fixed to the RV reducer, and the rotation shaft of the rotary motor is connected to the input shaft of the RV reducer. The second longitudinal mounting plate is fixed to the rotation output flange end face of the RV reducer.

[0008] A further improvement is that the end of the second mounting base is provided with an auxiliary mounting structure to enhance the installation strength and rotational stability of the abrasive belt wheel.

[0009] A further improvement is made to the auxiliary mounting structure, which includes a first semi-circular mounting plate and a second semi-circular mounting plate. The first semi-circular mounting plate is fixedly disposed at the end of the second mounting base along the direction parallel to the abrasive belt shaft. The second semi-circular mounting plate is assembled and fixed on the first semi-circular mounting plate. A rotation channel is formed between the first semi-circular mounting plate and the second semi-circular mounting plate. The front end and rear end of the abrasive belt shaft are respectively rotatably disposed in the rotation channel. The upper end and lower end of the first semi-circular mounting plate are respectively provided with clearance openings for the belt to pass through.

[0010] A further improvement is that the first semi-circular mounting plate is provided with a first fixing lug at its upper and lower ends, and the second semi-circular mounting plate is provided with a second fixing lug at its upper and lower ends, with a connecting fastener passing through the first fixing lug and the second fixing lug.

[0011] A further improvement is that a plurality of reinforcing plates are provided between the front end face and / or rear end face of the first semi-circular mounting plate and the second mounting base, wherein one end face of the reinforcing plate is fixedly disposed on the outer surface of the first semi-circular mounting plate and the other end face is fixedly disposed on the surface of the second mounting base.

[0012] A further improvement is that a dust cover is provided on the first pulley and the belt, the dust cover is fixed on the second mounting base, and one end of the dust cover has an arc-shaped sealing surface that fits and seals the clearance opening against the outer surface of the first semi-circular mounting plate.

[0013] A further improvement is that one of the reinforcing plates is located inside the belt winding area, and the dust cover is locked to the reinforcing plate.

[0014] A further improvement is made: a driven wheel adjustment structure is provided between the driven wheel and the second mounting base. The driven wheel adjustment structure includes a fixed base, a rotating base, and a rotating disk. The two ends of the driven wheel shaft are fixed to the outer end of the rotating base, and the rotating disk is fixed to the inner end of the rotating base. The inner surface of the rotating disk is provided with a rotating protrusion. The inner end of the fixed base is located on the second mounting base, and the rotating protrusion is rotatably located on the outer end face of the second mounting base. The outer end face of the second mounting base has several arc-shaped adjustment grooves with their centers on the central axis of the rotating protrusion. A threaded adjustment rod parallel to the central axis of the rotating protrusion slides through the arc-shaped adjustment grooves. The outer end of the threaded adjustment rod is fixed to the rotating disk, and the inner end of the threaded adjustment rod is screwed with an angle adjustment nut that abuts the rotating disk against the outer end face of the second mounting base to limit the rotation of the rotating disk.

[0015] A further improvement is made in that: a sanding belt tensioning structure is provided between the fixed base and the second mounting base. The sanding belt tensioning structure includes several guide rails, several sliders, a threaded fixing rod, and two fixing blocks. The guide rails are arranged parallel to the sanding belt and are fixed to the fixed base or the second mounting base. The sliders are fixed to the second mounting base or the fixed base and are slidably sleeved on the guide rails. The threaded fixing rods are arranged parallel to the guide rails, and one end of the threaded fixing rods is fixed to the second mounting base. The fixed base has a through hole for the threaded fixing rods to pass through. The two fixing blocks are threaded onto the threaded fixing rods on both sides of the through hole and are respectively pressed against the surface of the fixed base.

[0016] By adopting the aforementioned technical solution, the beneficial effects of this utility model are: This design places the belt abrasive motor in the middle of the second mounting base, abandoning the traditional structure where the motor is located at the end of the belt abrasive wheel. This achieves a balanced weight distribution at both ends of the grinding mechanism, eliminating eccentric loads during high-speed rotation and flipping operations. It significantly reduces the alternating shear force on the support and fasteners, preventing bolt loosening, deformation, and breakage, stabilizing the installation accuracy of the belt abrasive wheel, and improving the uniformity and processing quality of the workpiece grinding.

[0017] The rotary motor drives the first longitudinal mounting plate and the second mounting base to rotate up and down as a whole, which can flexibly adjust the sanding posture to adapt to the sanding needs of different curved surfaces and multi-angle workpieces; the sanding belt wheel and driven wheel are respectively located at both ends of the second mounting base, the sanding belt closed-loop transmission structure is stable, the sanding contact surface is regular, and the polishing and deburring effect is good.

[0018] The rotation of the sanding belt wheel shaft is achieved by belt drive to transmit power from the sanding belt motor to the sanding belt wheel shaft. The centrally located sanding belt motor realizes the lightweight counterweight balance of the whole machine, reduces the vibration and abnormal noise during the rotation of the rotating motor-driven mechanism, reduces the wear and deformation of bearings and frame, extends the service life of the whole machine, reduces the frequency of downtime maintenance and maintenance costs, and is suitable for long-term continuous industrial high-precision grinding conditions.

[0019] Further beneficial effects: The RV reducer is fixed to the first longitudinal mounting plate and connected to the rotary motor and the second longitudinal mounting plate, which can improve the mechanism's flipping positioning accuracy and load-bearing rigidity, buffer grinding vibration, share the load of the rotary motor, avoid flipping and shaking, and ensure the posture stability of high-precision grinding.

[0020] Further beneficial effects: The end of the second mounting base is equipped with an auxiliary mounting structure composed of two semi-circular plates. This auxiliary mounting structure forms a rotation channel through the splicing of the two semi-circular plates, providing bidirectional support for the front and rear ends of the sanding belt wheel shaft. The force is evenly distributed, effectively improving the coaxiality of the sanding belt wheel during high-speed operation, enhancing overall rotational stability, reducing radial runout and grinding vibration. The clearance opening on the plate body can normally avoid the belt, without affecting the power transmission of the sanding belt motor. At the same time, the lug fasteners make disassembly and assembly convenient, and the assembly accuracy can be guaranteed after maintenance, continuously ensuring rotational stability.

[0021] Further beneficial effects: The reinforcing plate connects the semi-circular mounting plate and the second mounting base, dispersing the radial impact force generated by the high-speed rotation of the sand belt wheel, preventing the semi-circular mounting plate from deforming and cracking under load, and improving the overall rigidity of the auxiliary mounting structure; the simultaneous reinforcement of multiple front and rear reinforcing plates significantly improves the equipment's vibration resistance.

[0022] Further beneficial effects: The dust cover completely covers the first pulley and the drive belt, preventing grinding dust and metal shavings from entering the pulley meshing area, preventing dust from wearing down the belt, causing slippage and breakage, extending the service life of the belt and pulley, and stabilizing the power transmission efficiency of the sander motor. The arc-shaped sealing surface fits snugly against the semi-circular mounting plate clearance opening, achieving a fully enclosed dustproof design, preventing dust from entering the shaft end bearing through the clearance opening, further reducing the probability of rotating component failure and reducing the frequency of cleaning and maintenance.

[0023] Further beneficial effects: The driven wheel adjustment structure uses the rotating protrusion as the rotation center, and together with the arc-shaped adjustment groove and threaded adjustment rod, it can steplessly adjust the deflection angle of the driven wheel, quickly correct the sanding belt deviation, and lock it in place by relying on the angle adjustment nut after adjustment to avoid angle deviation caused by grinding vibration, continuously ensure that the sanding belt runs in the center, and reduce one-sided wear and tear of the sanding belt.

[0024] Further beneficial effects: The belt tensioning structure achieves smooth linear translation of the driven wheel through the guide rail and slider, thereby changing the distance between the belt wheel and the driven wheel to adjust the belt tension. The threaded fixing rod, together with the two-way locking fixing seat on both sides, can offset the grinding impact vibration, maintain the belt tension stably for a long time, ensure the continuous and stable power output of the belt motor, and achieve a uniform grinding effect on the workpiece. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the lightweight double-end balanced rotary grinding mechanism according to an embodiment of this utility model.

[0026] Figure 2 This is a front view structural schematic diagram of the lightweight double-end balanced rotary grinding mechanism according to an embodiment of this utility model.

[0027] Figure 3 This is a top view schematic diagram of the lightweight double-end balanced rotary grinding mechanism according to an embodiment of this utility model.

[0028] Figure 4 This is a three-dimensional structural diagram of the belt wheel drive part in the lightweight double-end balanced rotary grinding mechanism of this utility model embodiment.

[0029] Figure 5 This is a three-dimensional structural diagram of the driven wheel adjustment structure and the sanding belt tensioning structure in the lightweight double-end balanced rotary grinding mechanism of this utility model embodiment.

[0030] Figure 6 This is a schematic diagram of the internal structure of the belt tensioning structure in the lightweight double-end balanced rotary grinding mechanism of this utility model embodiment. Detailed Implementation

[0031] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments.

[0032] refer to Figures 1 to 6 The present invention discloses a lightweight double-end balanced rotary grinding mechanism, including a first mounting base 10, a sanding belt wheel 11, a driven wheel 12, a sanding belt 13, a sanding belt wheel shaft 14, a driven wheel shaft 15, a sanding belt motor 16 and a rotary motor 17, and also includes a second mounting base 18, a first pulley 19, a second pulley 20 and a belt 21, and an RV reducer 22; The first mounting base 10 is fixedly provided with a first longitudinal mounting plate 23 along the front-back direction, and the second mounting base 18 is fixedly provided with a second longitudinal mounting plate 24 along the front-back direction; the RV reducer 22 is fixed on the first longitudinal mounting plate 23, the rotary motor 17 is fixed on the RV reducer 22, and the rotation shaft of the rotary motor 17 is connected to the input shaft of the RV reducer 22; the second longitudinal mounting plate 24 is fixed to the rotation output flange end face of the RV reducer 22.

[0033] The belt sander 16 is fixedly mounted on the second mounting base 18 in the middle of the second mounting base 18 along the front-back direction. The rotating shaft of the belt sander 16 passes through the second mounting base 18. The first pulley 19 is sleeved on the rotating shaft of the belt sander 16. The second pulley 20 is fixedly sleeved on the belt sander shaft 14. The belt sander shaft 14 is rotatably mounted on one end of the second mounting base 18 in a direction parallel to the rotating shaft of the belt sander 16. The belt 21 is wound around the first pulley 19 and the second pulley 20. The belt sander 11 is fixedly mounted on the belt sander shaft 14. The driven pulley 12 is rotatably sleeved on the driven pulley shaft 15. The two ends of the driven pulley shaft 15 are fixedly mounted on the other end of the second mounting base 18. The sanding belt 13 is wound around the belt sander 11 and the driven pulley 12.

[0034] Furthermore, the second mounting base 18 is provided with an auxiliary mounting structure at its end to enhance the installation strength and rotational stability of the abrasive belt wheel 11. The auxiliary mounting structure includes a first semi-circular mounting plate 25 and a second semi-circular mounting plate 26. The first semi-circular mounting plate 25 is integrally fixed to the end of the second mounting base 18 along a direction parallel to the abrasive belt wheel shaft 14. The second semi-circular mounting plate 26 is assembled and fixed onto the first semi-circular mounting plate 25, forming a rotational channel between them. The front and rear ends of the abrasive belt wheel shaft 14 are rotatably mounted within the rotational channel using bearings. The upper and lower ends of the first semi-circular mounting plate 25 are respectively provided with clearance openings 27 for the belt 21 to pass through. The upper and lower ends of the first semi-circular mounting plate 25 are provided with first fixing lugs 28, and the upper and lower ends of the second semi-circular mounting plate 26 are provided with second fixing lugs 29. Connecting fasteners (not shown in the figure) pass between the first fixing lugs 28 and the second fixing lugs 29. The connecting fastener is a bolt and nut assembly or a screw and nut assembly; the bolt or screw passes through the first fixing lug 28 and the second fixing lug 29, and the nut is screwed onto the bolt or screw, so that the first fixing lug 28 and the second fixing lug 29 are pressed together and fixedly connected.

[0035] Furthermore, a plurality of reinforcing plates 30 are provided between the front end face and / or rear end face of the first semi-circular mounting plate 25 and the second mounting base 18. One end face of the reinforcing plate 30 is fixedly disposed on the outer surface of the first semi-circular mounting plate 25, and the other end face is fixed to the surface of the second mounting base 18.

[0036] Furthermore, a dust cover 31 is provided on the first pulley 19 and the belt 21. The dust cover 31 is fixed on the second mounting base 18. One end of the dust cover 31 has an arc-shaped sealing surface that fits against the outer surface of the first semi-circular mounting plate 25 and closes the clearance opening 27. One of the reinforcing plates 30 is located inside the area where the belt 21 is wound, and the dust cover 31 is locked onto the reinforcing plate 30.

[0037] Furthermore, a driven wheel adjustment structure is provided between the driven wheel 12 and the second mounting base 18. The driven wheel adjustment structure includes a fixed base 32, a rotating base 33, and a rotating disk 34. The driven wheel shaft 15 is fixed at both ends to the outer end of the rotating base 33, and the rotating disk 34 is fixed to the inner end of the rotating base 33. The inner surface of the rotating disk 34 is provided with a rotating protrusion 35. The inner end of the fixed base 32 is disposed on the second mounting base 18, and the rotating protrusion 35 is rotatably disposed on the fixed base 12. The outer end face of the second mounting base 18 is provided with two arc-shaped adjustment grooves 36 whose centers are on the central axis of the rotating protrusion 35. A threaded adjustment rod (not shown in the figure) parallel to the central axis of the rotating protrusion 35 slides through the arc-shaped adjustment grooves 36. The outer end of the threaded adjustment rod is fixed to the rotating disk 34, and the inner end of the threaded adjustment rod is screwed with an angle adjustment nut (not shown in the figure) that makes the rotating disk 34 abut against the outer end face of the second mounting base 18 to limit the rotation of the rotating disk 34.

[0038] This driven wheel angle adjustment structure is designed to solve the problem of belt misalignment during operation. By adjusting the deflection angle of the driven wheel 12, the wrap angle and direction of the sanding belt 13 on the driven wheel 12 are changed, thereby achieving deviation correction. The adjustment operation is as follows: First, loosen the angle adjusting nut to release the lock between the rotating disk 34 and the second mounting base 18; then manually rotate the driven wheel 12 assembly to make the threaded adjusting rod slide along the arc-shaped adjusting groove 36, while starting the sanding belt motor 16 at low speed and observing the direction of the sanding belt 13 deviation. Finely adjust the angle of the driven wheel 12 in the opposite direction of deviation until the sanding belt 13 is basically centered between the sanding belt wheel 11 and the driven wheel 12; finally, tighten the angle adjusting nut to make the rotating disk 34 and the outer end face of the second mounting base 18 tightly abut against each other, and fix the adjusted angle.

[0039] Furthermore, a sanding belt tensioning structure is provided between the fixed base 32 and the second mounting base 18. The sanding belt tensioning structure includes two guide rails 37, two or four sliders 38, a threaded fixing rod 39, and two fixing blocks 40. The guide rails 37 are arranged parallel to the sanding belt 13 and are fixed to the fixed base 32 or the second mounting base 18. The sliders 38 are fixed to the second mounting base 18 or the fixed base 32 and are slidably sleeved on the guide rails 37. The threaded fixing rod 39 is arranged parallel to the guide rails 37, and one end of the threaded fixing rod 39 is fixed to the second mounting base 18. The fixed base 32 has a through hole for the threaded fixing rod 39 to pass through. The two fixing blocks 40 are threaded onto the threaded fixing rod 39 on both sides of the through hole and are respectively pressed against the surface of the fixed base 32.

[0040] The sanding belt tensioning structure is designed to allow for convenient adjustment of the sanding belt 13's tension when it becomes loose during long-term operation, ensuring stable grinding pressure and transmission efficiency. During adjustment, first loosen the two fixing blocks 40 to release the lock between the fixing seat 32 and the second mounting seat 18. Then, move the fixing seat 32 along the guide rail 37. This causes the driven wheel 12 to move together, changing the distance between the driven wheel 12 and the sanding belt wheel 11 to tension or loosen the sanding belt 13. After adjusting to the appropriate tension, press the two fixing blocks 40 against the surface of the fixing seat 32 and lock them in place, thus fixing the fixing seat 32 relative to the second mounting seat 18. The guide rail 37 ensures a straight and stable movement trajectory, while the slider 38 provides a low-resistance sliding fit. The bidirectional locking mechanism of the fixing blocks 40 effectively resists grinding vibrations and prevents loosening of the tensioned position.

[0041] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions above are only illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from the spirit and scope of this utility model. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A lightweight double-end balanced rotary grinding mechanism, comprising a first mounting base, a sanding belt wheel, a driven wheel, a sanding belt, a sanding belt wheel shaft, a driven wheel shaft, a sanding belt motor, and a rotary motor, characterized in that: It also includes a second mounting base, a first pulley, a second pulley, and a belt; The first mounting base is fixedly provided with a first longitudinal mounting plate along the front-back direction, and the second mounting base is fixedly provided with a second longitudinal mounting plate along the front-back direction; the rotary motor is fixedly provided on the first longitudinal mounting plate and drives the first longitudinal mounting plate and the second mounting base to rotate up and down. The belt sander motor is fixedly mounted on the second mounting base in the front-to-back direction at the center of the second mounting base. The rotating shaft of the belt sander motor passes through the second mounting base. The first pulley is sleeved on the rotating shaft of the belt sander motor, and the second pulley is fixedly sleeved on the belt sander shaft. The belt sander shaft is rotatably mounted on one end of the second mounting base in a direction parallel to the rotating shaft of the belt sander motor. The belt is wound around the first pulley and the second pulley. The belt sander is fixedly mounted on the belt sander shaft, and the driven wheel is rotatably sleeved on the driven wheel shaft. Both ends of the driven wheel shaft are fixedly mounted on the other end of the second mounting base. The sanding belt is wound around the belt sander and the driven wheel.

2. The lightweight double-end balanced rotary grinding mechanism according to claim 1, characterized in that: It also includes an RV reducer, which is fixed to the first longitudinal mounting plate. The rotary motor is fixed to the RV reducer, and the rotation shaft of the rotary motor is connected to the input shaft of the RV reducer. The second longitudinal mounting plate is fixed to the rotation output flange end face of the RV reducer.

3. The lightweight double-end balanced rotary grinding mechanism according to claim 1 or 2, characterized in that: The second mounting base is provided with an auxiliary mounting structure at its end to enhance the mounting strength and rotational stability of the abrasive belt wheel.

4. The lightweight double-end balanced rotary grinding mechanism according to claim 3, characterized in that: The auxiliary installation structure includes a first semi-circular mounting plate and a second semi-circular mounting plate. The first semi-circular mounting plate is fixedly disposed at the end of the second mounting base along the direction parallel to the abrasive belt shaft. The second semi-circular mounting plate is spliced ​​and fixed on the first semi-circular mounting plate. A rotation channel is formed between the first semi-circular mounting plate and the second semi-circular mounting plate. The front end and rear end of the abrasive belt shaft are respectively rotatably disposed in the rotation channel. The upper end and lower end of the first semi-circular mounting plate are respectively provided with clearance openings for the belt to pass through.

5. The lightweight double-end balanced rotary grinding mechanism according to claim 4, characterized in that: The first semi-circular mounting plate is provided with a first fixing lug at its upper and lower ends, and the second semi-circular mounting plate is provided with a second fixing lug at its upper and lower ends. A connecting fastener is provided between the first fixing lug and the second fixing lug.

6. The lightweight double-end balanced rotary grinding mechanism according to claim 4, characterized in that: A plurality of reinforcing plates are provided between the front end face and / or rear end face of the first semi-circular mounting plate and the second mounting base. One end face of the reinforcing plate is fixedly disposed on the outer surface of the first semi-circular mounting plate, and the other end face is fixedly disposed on the surface of the second mounting base.

7. The lightweight double-end balanced rotary grinding mechanism according to claim 6, characterized in that: The first pulley and belt are covered with a dust cover, which is fixed to the second mounting base. One end of the dust cover has an arc-shaped sealing surface that fits and seals the clearance opening against the outer surface of the first semi-circular mounting plate.

8. The lightweight double-end balanced rotary grinding mechanism according to claim 7, characterized in that: One of the reinforcing plates is located inside the belt winding area, and the dust cover is locked to the reinforcing plate.

9. The lightweight double-end balanced rotary grinding mechanism according to claim 1 or 2, characterized in that: A driven wheel adjustment structure is provided between the driven wheel and the second mounting base. The driven wheel adjustment structure includes a fixed base, a rotating base, and a rotating disk. The two ends of the driven wheel shaft are fixed to the outer end of the rotating base, and the rotating disk is fixed to the inner end of the rotating base. The inner surface of the rotating disk is provided with a rotating protrusion. The inner end of the fixed base is located on the second mounting base, and the rotating protrusion is rotatably located on the outer end face of the second mounting base. The outer end face of the second mounting base has several arc-shaped adjustment grooves with their centers on the central axis of the rotating protrusion. A threaded adjustment rod parallel to the central axis of the rotating protrusion slides through the arc-shaped adjustment groove. The outer end of the threaded adjustment rod is fixed to the rotating disk, and the inner end of the threaded adjustment rod is screwed with an angle adjustment nut that abuts the rotating disk against the outer end face of the second mounting base to limit the rotation of the rotating disk.

10. The lightweight double-end balanced rotary grinding mechanism according to claim 9, characterized in that: A sanding belt tensioning structure is provided between the fixed base and the second mounting base. The sanding belt tensioning structure includes several guide rails, several sliders, a threaded fixing rod, and two fixing blocks. The guide rails are arranged parallel to the sanding belt and are fixed to the fixed base or the second mounting base. The sliders are fixed to the second mounting base or the fixed base and are slidably sleeved on the guide rails. The threaded fixing rods are arranged parallel to the guide rails, and one end of the threaded fixing rods is fixed to the second mounting base. The fixed base has a through hole for the threaded fixing rods to pass through. The two fixing blocks are threaded onto the threaded fixing rods on both sides of the through hole and are respectively pressed against the surface of the fixed base.

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