Polishing device and polishing equipment

Abstract

The invention relates to the technical field of polishing equipment, and discloses a polishing device and a polishing device.The polishing device comprises a rack, a driving motor and an input shaft, a transmission assembly is in transmission connection with the input shaft, and a polishing unit comprises a first output shaft connected with a first joint part and a second output shaft connected with a second joint part; and the reversing assembly is configured to selectively transmit power to the first output shaft or the second output shaft according to the rotating direction of the input shaft. The grinding tools can be automatically and rapidly switched only by changing the rotating direction of the driving motor, the operation time for replacing the grinding tools or stations is shortened, through one-machine double-drive, a mounting structure and a controller for independently driving the grinding tools by a plurality of driving mechanisms are omitted, the structure of the whole device is greatly simplified, and the whole structure is more compact.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polishing equipment, in particular to a polishing device and polishing equipment. BACKGROUND

[0002] In the automatic polishing and polishing operation, in order to adapt to different processes, such as rough grinding and fine grinding, two different specifications of polishing tools need to be integrated in the same station. In the prior art, either a single structure is adopted to adapt only to a single process product for polishing processing, and the polishing tool needs to be replaced during different processes, or a set of driving motors and transmission systems are configured for each polishing tool. This one-machine-one-drive mode will lead to complex equipment structure, large space occupation, high manufacturing cost, and complex overall control and increased energy consumption due to multiple power sources. SUMMARY

[0003] The purpose of the present application is to provide a polishing device and polishing equipment to solve the problems in the prior art, which can drive at least two different polishing tools by one motor, and can expand the installation of other process required polishing consumables according to process requirements, which can ensure the quality stability of the polishing process, and has the advantages of compact structure and low cost.

[0004] The present application provides a polishing device, comprising: a rack; a driving motor arranged on the rack, an output end of the driving motor being drivingly connected to an input shaft; a transmission assembly drivingly connected to the input shaft; a reversing assembly connected to the transmission assembly, the reversing assembly comprising a first engaging portion and a second engaging portion arranged symmetrically; a polishing unit comprising a first output shaft, a second output shaft and a polishing assembly, the first output shaft being connected to the first engaging portion, the second output shaft being connected to the second engaging portion, and the polishing assembly being connected to the first output shaft and the second output shaft respectively; wherein the reversing assembly is configured to selectively transmit power to the first output shaft or the second output shaft according to the rotation direction of the input shaft.

[0005] The polishing device described above, wherein preferably the transmission assembly comprises a synchronous belt transmission pair, the synchronous belt transmission pair comprising a first synchronous pulley, a second synchronous pulley and a synchronous belt; the first engaging portion is a first one-way bearing mounted in the first synchronous pulley, the second engaging portion is a second one-way bearing mounted in the second synchronous pulley, and the locking directions of the first one-way bearing and the second one-way bearing are opposite.

[0006] The polishing device as claimed in any one of the preceding claims, wherein preferably, the synchronous belt transmission pair further comprises a tensioning assembly, the tensioning assembly comprises an eccentric shaft and a tensioning idler arranged concentrically, the first synchronous pulley and the second synchronous pulley are arranged with a fixed center distance, and the tensioning idler is pressed against one side of the synchronous belt.

[0007] The polishing device as claimed in any one of the preceding claims, wherein preferably, the polishing device further comprises a rotating unit, the rotating unit comprises a rotating drive and a speed reducer, the speed reducer is arranged at an output end of the rotating drive, and the polishing unit is mounted at an output end of the speed reducer, and the rotating drive is used to drive the polishing unit to rotate around an output axis of the speed reducer.

[0008] The polishing device as claimed in any one of the preceding claims, wherein preferably, the speed reducer is a hollow speed reducer, and a channel for wire harness to pass through is arranged in the hollow speed reducer and the polishing unit.

[0009] The polishing device as claimed in any one of the preceding claims, wherein preferably, the polishing assembly comprises a first polishing member, a second polishing member and a third polishing member, the first polishing member and the second polishing member are coaxially arranged on the first output shaft, and the third polishing member is arranged on the second output shaft.

[0010] The polishing device as claimed in any one of the preceding claims, wherein preferably, the second polishing member and / or the third polishing member is a sand belt polishing mechanism, the sand belt polishing mechanism comprises an inertia wheel, a driven wheel, a mounting arm, a sand belt and a cylinder; The inertia wheel is connected to the corresponding first output shaft and / or the second output shaft through a sleeve; The driven wheel is provided with two, and the two driven wheels are rotatably mounted on the mounting arm; The sand belt is sleeved on the inertia wheel and the two driven wheels; The output end of the cylinder is connected with the mounting arm, and is used to drive the mounting arm to move to tension the sand belt.

[0011] The polishing device as claimed in any one of the preceding claims, wherein preferably, the sand belt polishing mechanism further comprises a proportional valve, the proportional valve is connected with the cylinder, and is used to adjust the air pressure supplied to the cylinder to control the constant polishing pressure of the sand belt on the surface of the workpiece.

[0012] The polishing device as claimed in any one of the preceding claims, wherein preferably, the cylinder is provided with a slide valve on an air inlet passage of an extension cavity, and is provided with a silencer on an exhaust port of a retraction cavity.

[0013] A polishing device comprising the polishing device as claimed in any one of the preceding claims.

[0014] Compared with the prior art, the polishing device provided by the embodiment of the present application realizes the integration of one driving motor and the driving of multiple different polishing tools through the transmission assembly and the reversing assembly, can automatically and quickly switch the polishing tools by only changing the rotating direction of the driving motor, reduces the operation time for replacing the polishing tools or the workstations, improves the work efficiency and the automation degree, saves the installation structure and the controller of multiple driving mechanisms for independently driving the polishing tools through one machine with double driving, greatly simplifies the overall device structure, makes the overall structure more compact, saves the occupied space of the equipment, and in addition, the polishing device can freely switch multiple polishing specifications through low-power driving and can freely match different polishing media. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a perspective view of the polishing device provided by the embodiment of the present application; Figure 2 is a side view of the polishing device provided by the embodiment of the present application; Figure 3 is a partial cross-sectional view of the polishing device provided by the embodiment of the present application; Figure 4 is a cross-sectional view of the polishing unit provided by the embodiment of the present application; Figure 5 is a perspective view of the polishing unit provided by the embodiment of the present application Figure 6 is a front view of the transmission assembly and the reversing assembly provided by the embodiment of the present application; Figure 7 is a perspective view of the polishing unit provided by the embodiment of the present application in another direction.

[0016] BRIEF DESCRIPTION OF DRAWINGS: 10, rack; 20, driving motor; 21, input shaft; 30, transmission assembly; 31, first synchronous wheel; 32, second synchronous wheel; 33, synchronous belt; 34, expansion assembly; 340, eccentric shaft; 341, expansion idler; 40, reversing assembly; 41, first one-way bearing; 42, second one-way bearing; 50, polishing unit; 51, first output shaft; 52, second output shaft; 53, first polishing piece; 54, second polishing piece; 540, inertia wheel; 541, expansion sleeve; 542, driven wheel; 543, mounting arm; 544, sand belt; 545, air cylinder; 546, slide valve; 547, muffler; 55, third polishing piece; 60, rotating driving piece; 61, speed reducer; 62, fixed frame; 63, first through hole; 64, nylon disc; 65, second through hole; 66, air pipe. DETAILED DESCRIPTION

[0017] The embodiments described below are exemplary only, and are not to be construed as limiting the present application.

[0018] Referring to Figures 1-3 As shown in the drawings, the embodiment provides a polishing device, comprising a rack 10, a driving motor 20, a transmission assembly 30, a reversing assembly 40 and a polishing unit 50, wherein: The rack 10 serves as a bearing base and is connected to an existing polishing platform. The driving motor 20 is arranged on the rack 10, and the output end of the driving motor 20 is drivingly connected to an input shaft 21. The driving motor 20 is arranged at the rear end of the rack 10, and the structure is rear-mounted as a balance weight of the entire device, so that it is more stable during high-speed rotation or emergency stop. The output end of the driving motor 20 is connected to the input shaft 21 through a concentric shaft coupling, and the input shaft 21 extends forward through the rack 10.

[0019] Referring to Figure 3 As shown in the drawings, the transmission assembly 30 is drivingly connected to the input shaft 21; the reversing assembly 40 is connected to the transmission assembly 30, and the reversing assembly 40 comprises symmetrically arranged first and second engaging portions; the polishing unit 50 comprises first and second output shafts 51 and 52 and a polishing assembly, the first output shaft 51 is connected to the first engaging portion, the second output shaft 52 is connected to the second engaging portion, and the polishing assembly is connected to the first and second output shafts 51 and 52 respectively. The reversing assembly 40 is configured to selectively transmit power to the first or second output shaft 51 or 52 according to the rotation direction of the input shaft 21. The first output shaft 51 is coaxially mounted with the input shaft 21, and the second output shaft 52 is arranged in parallel with the first output shaft 51. The polishing assemblies on the first and second output shafts 51 and 52 can use different polishing tools respectively, so that one polishing device can carry multiple different polishing tools, reducing the changeover time.

[0020] In the embodiments provided in the present application, one driving motor 20 can drive two different polishing tools to perform polishing work respectively. The reversing assembly 40 can selectively transmit power to the first or second output shaft 51 or 52 according to the rotation direction of the input shaft 21, i.e. the forward or reverse rotation of the driving motor 20, while the other output shaft is in an idle or no effective torque transmission state. In this way, the switching between two or more different functional polishing tools can be realized by only changing the direction of the driving motor 20, without the need for additional driving mechanisms, simplifying the device structure and reducing the cost.

[0021] Referring to Figure 4 and Figure 6As shown, in some embodiments of the present application, the transmission assembly 30 comprises a synchronous belt 33 transmission pair, which comprises a first synchronous wheel 31, a second synchronous wheel 32 and a synchronous belt 33. The first synchronous wheel 31 is connected with the first output shaft 51, the second synchronous wheel 32 is connected with the second output shaft 52, and the synchronous belt 33 is annularly arranged on the first synchronous wheel 31 and the second synchronous wheel 32. The first engaging part is a first one-way bearing 41 installed in the first synchronous wheel 31, the second engaging part is a second one-way bearing 42 installed in the second synchronous wheel 32, and the locking directions of the first one-way bearing 41 and the second one-way bearing 42 are opposite. When the driving motor 20 rotates forward, the input shaft 21 drives the first synchronous wheel 31 to rotate forward, the first one-way bearing 41 enters the locking state because its locking direction matches the forward rotation direction, and the rotating power of the first synchronous wheel 31 is transmitted to the first output shaft 51, so as to drive the polishing assembly on the first output shaft 51 to rotate, but the synchronous belt 33 drives the second synchronous wheel 32 to also rotate forward, but the second one-way bearing 42 is in the slipping state, so that the second synchronous wheel 32 idles on the second output shaft 52 and cannot transmit torque, and the second output shaft 52 and the polishing assembly thereon remain stationary. When it is necessary to switch the polishing assembly, the driving motor 20 is controlled to reverse, and the present application solves the complex mechanical clutch or additional driving system through two low-cost but reliable and compact one-way bearings and simple forward and reverse control of the driving motor 20, realizes automatic switching of the power path, does not occupy the effective input power of the motor, and realizes high integration. It should be noted that in the above embodiment, the first one-way bearing 41 locks the forward rotation direction, and the second one-way bearing 42 locks the reverse rotation direction, which is only a preferred configuration. Those skilled in the art can understand that by exchanging the locking directions of the first one-way bearing 41 and the second one-way bearing 42, the corresponding relationship between the rotation direction of the driving motor 20 and the working state of the first output shaft 51 and the second output shaft 52 can be changed, and the present embodiment does not limit this.

[0022] Of course, in other embodiments, the transmission assembly 30 can also adopt a gear transmission pair or a chain transmission pair and other transmission structures capable of realizing power transmission and distribution, and the reversing assembly 40 can also adopt a ratchet mechanism, an overrunning clutch, or any selection mechanism capable of selectively transmitting power according to the rotation direction, such as an electromagnetic clutch of the normally open type, which is controlled by an electric circuit. When the motor rotates forward, the first clutch is energized and attracted, and when it reverses, the second clutch is energized and attracted, which is not limited herein.

[0023] Referring to Figure 6As shown, for the high-frequency, impact load working condition of polishing work, when the polishing assembly is in contact with the workpiece surface, it will produce continuous and random vibration. The traditional double-wheel tensioning method is prone to slight tooth skipping or transmission jitter when dealing with such vibration, which affects the transmission accuracy and service life in the long run. Therefore, in this embodiment, the synchronous belt 33 transmission pair further includes an expansion assembly 34, which includes a concentrically arranged eccentric shaft 340 and an expansion idler 341, and the first synchronous wheel 31 and the second synchronous wheel 32 are arranged with a fixed center distance, and the expansion idler 341 is pressed against one side of the synchronous belt 33. By rotating the eccentric shaft 340, the position of the expansion idler 341 can be accurately adjusted so that it is stably pressed against the non-working side of the synchronous belt 33, usually the loose side, thereby increasing the number of meshing teeth of the synchronous belt 33 with the first synchronous wheel 31 and the second synchronous wheel 32, which can bring smoother power and torsional rigidity, and more effectively cope with the high-frequency vibration when the polishing tool and the product are in contact during polishing.

[0024] In addition, the eccentric shaft 340 is used to achieve tensioning, and the adjustment method is precise, convenient and lockable, overcoming the shortcomings of spring tensioning force changing with working conditions or screw tensioning being inconvenient for fine adjustment, further ensuring the persistence and consistency of the tensioning state.

[0025] Referring to Figures 2-3 As shown, in order to enable the polishing device to adapt to multi-angle polishing requirements, in some embodiments of the present application, the polishing device further comprises a rotating unit, the rotating unit comprising a rotating drive member 60 and a speed reducer 61, the speed reducer 61 being arranged at the output end of the rotating drive member 60, and the polishing unit 50 being mounted on the output end of the speed reducer 61, the rotating drive member 60 being used to drive the polishing unit 50 to rotate around the output axis of the speed reducer 61. The rotating drive member 60 can adopt a hollow servo motor, which is arranged perpendicular to the input shaft 21, and the polishing unit 50 is mounted on the output end of the speed reducer 61 through a flange or the like. When the rotating drive member 60 is started, it can drive the entire polishing unit 50 to rotate around the output axis of the speed reducer 61, so that a single polishing assembly can approach the workpiece from multiple angles, greatly expanding its process application range.

[0026] Referring to Figures 2-6 As shown, further, the speed reducer 61 is a hollow speed reducer, and both the hollow speed reducer and the rack 10 are provided with channels for wire harnesses to pass through. The air pipe cable and the like in the device can be routed through the channels, avoiding the winding and wear risks caused by cable exposure, and improving reliability and safety.

[0027] Referring to Figure 7 As shown, in some embodiments of the present application, an inertia wheel 540 is mounted on each of the first output shaft 51 and the second output shaft 52, and the inertia wheel 540 is connected to the corresponding first output shaft 51 and second output shaft 52 through a bulging sleeve 541. The inertia wheel 540 is used to increase the inertia of the entire device and reduce load vibration, etc.

[0028] As shown in Figure 2 and Figure 7 In some embodiments of the present application, the polishing assembly includes a first polishing member 53, a second polishing member 54 and a third polishing member 55. The first polishing member 53 and the second polishing member 54 are coaxially arranged on the first output shaft 51, and the third polishing member 55 is arranged on the second output shaft 52. On the first output shaft 51, in addition to the end portion which can be provided with the first polishing member 53, the second polishing member 54 can also be coaxially mounted through an intermediate connecting flange, so that the first output shaft 51 can carry two kinds of polishing tools. The third polishing member 55 is mounted on the second output shaft 52, and the third polishing member 55 can be symmetrically arranged with the second polishing member 54. Through reasonable layout, the installation of multiple polishing members is realized.

[0029] As shown in Figure 2 In a feasible embodiment, the first polishing member 53 adopts a wire drawing wheel, a thousand-page wheel, etc., and the second polishing member 54 and the third polishing member 55 are sand belt polishing mechanisms with different mesh numbers. In operation, the wire drawing wheel is driven in forward rotation for rough grinding and one sand belt polishing mechanism performs polishing work. After the rotation unit is rotated by a specific angle, the other sand belt polishing mechanism with different mesh number is driven in reverse rotation to perform polishing work, so that one machine can perform multiple grinding, effectively reducing the change type time and improving the work efficiency.

[0030] As shown in Figure 7 In this embodiment, the sand belt polishing mechanism includes an inertia wheel 540, a driven wheel 542, a mounting arm 543, a sand belt 544 and a pneumatic cylinder 545. The inertia wheel 540 is connected with the corresponding first output shaft 51 and second output shaft 52 through an expansion sleeve 541. During installation, the fastening bolts on the expansion sleeve 541 are tightened to uniformly expand the inner hole, so as to realize the keyless connection of the inertia wheel 540. The inertia wheel 540 functions to increase the rotational inertia of the output shaft system, which can effectively buffer the impact and suppress the vibration during work, and maintain the stability of the polishing speed.

[0031] Two driven wheels 542 are rotatably mounted on mounting arms 543, which are in U or Y shape, and the two driven wheels 542 are symmetrically mounted at the ends of the branches of the mounting arms 543 through bearings. A sand belt 544 is sleeved on the inertial wheel 540 and the two driven wheels 542, forming a stable triangular contact area, which can increase the effective polishing area. The output end of the air cylinder 545 is connected with the mounting arm 543, which is used to drive the mounting arm 543 to move to tension the sand belt 544. The air cylinder 545 adopts a mini air cylinder 545 with a guide rod, the cylinder body of which is fixed on the rack 10, and the output shaft of the air cylinder 545 is hinged to the middle part of the mounting arm 543 through a floating joint. Through the extension and contraction of the output end of the air cylinder 545, the mounting arm 543 can be moved, so that the position of the driven wheel 542 is changed, and the sand belt 544 is tensioned or relaxed.

[0032] Referring to Figure 5 As shown in the embodiment, the air pipe 66 of the air cylinder 545 can pass through the inside of the channel, the first output shaft 51 and the second output shaft 52 are supported by the fixed frame 62, the fixed frame 62 is connected with the speed reducer 61 through the shell, the first through hole 63 is formed between the first output shaft 51 and the second output shaft 52 in the fixed frame 62, the input shaft 21 is sleeved with the nylon disc 64 through a bearing, the second through hole 65 is formed in the nylon disc 64, the air pipe 66 of the air cylinder 545 can extend into the device from the side of the polishing unit 50 into the first through hole 63, the air pipe 66 on the side can be fixed by the surrounding sheet metal part, and the air pipe 66 is guided by the second through hole 65 and extends to the outside through the mounting surface of the rack 10. The nylon disc 64 plays a role in fixing and guiding the air pipe 66 to pass through. When the speed reducer 61 drives the polishing unit 50 to rotate, the surrounding sheet metal part and the nylon disc 64 can ensure that the air pipe is not twisted.

[0033] Referring to Figure 7 Further, the sand belt polishing mechanism further comprises a proportional valve for adjusting the air pressure supplied to the air cylinder 545 to control the constant polishing pressure of the sand belt 544 on the surface of the workpiece. During polishing, when the sand belt 544 contacts the surface of the workpiece, it will be subjected to a counter force. The control system receives the signal of the counter force and compares it with the set target constant force value. When the preset threshold is exceeded, the output air pressure of the proportional valve is adjusted, so that the output force of the air cylinder 545 is changed accordingly, so that the driven wheel 542 produces a small displacement, and finally the contact pressure of the sand belt 544 on the surface of the workpiece is kept constant. The use of such floating polishing can solve the problem of over-polishing or under-polishing caused by the size tolerance or clamping error of the workpiece in traditional rigid polishing, and significantly improve the product qualification rate.

[0034] Referring to Figure 4As shown, in order to facilitate the operator to quickly replace the abrasive belt 544 consumables, in this embodiment, the air cylinder 545 is provided with a slide valve 546 on the air inlet passage of the extension cavity, and the air cylinder 545 is provided with a silencer 547 on the exhaust port of the retraction cavity, for reducing the exhaust noise when the air cylinder 545 is in action, and improving the working environment. When replacing the abrasive belt 544 consumables, the operator only needs to adjust the slide valve position to the off or exhaust position, so as to interrupt the air source and realize the quick replacement of the abrasive belt 544.

[0035] The embodiment also provides a polishing device, which comprises the polishing device described above and is fixedly installed on the mounting surface of the rack 10.

[0036] Based on the above embodiment, the working principle of the polishing device provided by the present application is as follows: When the driving motor 20 is in forward rotation, the input shaft 21 drives the first output shaft 51 to rotate forward, and the first synchronous wheel 31 rotates forward accordingly. The locking direction of the first one-way bearing 41 matches the current forward rotation direction, so that the first one-way bearing 41 enters the locking state, and the first polishing piece 53 and the second polishing piece 54 work. At the same time, through the connection of the synchronous belt 33, the rotation of the first synchronous wheel 31 drives the second synchronous wheel 32 to also rotate forward. However, the locking direction of the second one-way bearing 42 is opposite to the current forward rotation direction, so that the second one-way bearing 42 is in the slip state, the second synchronous wheel 32 idles on the second output shaft 52, and the second output shaft 52 and the third polishing piece 55 thereon remain stationary.

[0037] When the driving motor 20 is in reverse rotation, the input shaft 21 and the first output shaft 51 rotate reversely, the first synchronous wheel 31 rotates reversely, and the locking direction of the first one-way bearing 41 does not match the reverse rotation, so that the first one-way bearing 41 enters the slip state, the first synchronous wheel 31 idles on the first output shaft 51, and the polishing piece on the first output shaft 51 stops working. The synchronous belt 33 drives the second synchronous wheel 32 to rotate reversely, and the locking direction of the second one-way bearing 42 is the same as the reverse rotation direction. Therefore, the second one-way bearing 42 enters the locking state, rigidly connects the second synchronous wheel 32 and the second output shaft 52, and effectively transmits the torque to the second output shaft 52 through the second synchronous wheel 32 and the second one-way bearing 42, to drive the third polishing piece 55 to work.

[0038] The above embodiment according to the drawings illustrates the structure, features and effects of the present application. The above description is only a preferred embodiment of the present application, but the present application is not limited by the drawings. Any changes or modifications made in accordance with the concept of the present application, or equivalent embodiments with equivalent changes, shall be within the scope of the present application.

Claims

1. A polishing device, characterized in that, include: frame; A drive motor is mounted on the frame, and the output end of the drive motor is connected to the input shaft. The transmission assembly is connected to the input shaft in a driving manner; A reversing assembly connected to the transmission assembly, the reversing assembly including a first engagement portion and a second engagement portion arranged symmetrically; A polishing unit includes a first output shaft, a second output shaft, and a polishing assembly. The first output shaft is connected to the first joint, the second output shaft is connected to the second joint, and the polishing assembly is connected to the first output shaft and the second output shaft respectively. The commutation component is configured to selectively transmit power to the first output shaft or the second output shaft according to the rotation direction of the input shaft.

2. The polishing device according to claim 1, characterized in that, The transmission assembly includes a synchronous belt drive pair, which includes a first synchronous pulley, a second synchronous pulley, and a synchronous belt. The first engagement portion is a first one-way bearing installed in the first synchronous pulley, and the second engagement portion is a second one-way bearing installed in the second synchronous pulley, with the locking directions of the first one-way bearing and the second one-way bearing being opposite.

3. The polishing device according to claim 2, characterized in that, The synchronous belt drive pair also includes a tensioning assembly, which includes a concentrically arranged eccentric shaft and a tensioning idler pulley. The first synchronous pulley and the second synchronous pulley are arranged with a fixed center distance, and the tensioning idler pulley presses against one side of the synchronous belt.

4. The polishing device according to claim 1, characterized in that, The grinding device further includes a rotating unit, which includes a rotating drive and a reducer. The reducer is located at the output end of the rotating drive, and the grinding unit is installed at the output end of the reducer. The rotating drive is used to drive the grinding unit to rotate around the output axis of the reducer.

5. The polishing apparatus according to claim 4, characterized in that, The reducer is a hollow reducer, and both the hollow reducer and the grinding unit have channels for the wire harness to pass through.

6. The polishing apparatus according to claim 1, characterized in that, The polishing assembly includes a first polishing component, a second polishing component, and a third polishing component. The first polishing component and the second polishing component are coaxially mounted on the first output shaft, and the third polishing component is mounted on the second output shaft.

7. The polishing apparatus according to claim 6, characterized in that, The second grinding component and / or the third grinding component is a belt sanding mechanism, which includes an inertia wheel, a driven wheel, a mounting arm, a sanding belt, and a cylinder. The inertia wheel is connected to the corresponding first output shaft and / or second output shaft via an expansion sleeve; The driven wheels are provided in two parts, and the two driven wheels are rotatably mounted on the mounting arm; The sanding belt is fitted onto the inertia wheel and the two driven wheels; The output end of the cylinder is connected to the mounting arm and is used to drive the mounting arm to move in order to tension the sanding belt.

8. The polishing apparatus according to claim 7, characterized in that, The belt abrasive grinding mechanism also includes a proportional valve, which is connected to the cylinder and is used to adjust the air pressure supplied to the cylinder in order to control the constant grinding pressure of the abrasive belt on the workpiece surface.

9. The polishing apparatus according to claim 7, characterized in that, The cylinder is equipped with a sliding valve on the air intake passage of the extension chamber, and a muffler on the exhaust port of the retraction chamber.

10. A grinding device, characterized in that, Includes the polishing apparatus as described in any one of claims 1-9.

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