Automatic polishing liquid supply device and use method thereof

Abstract

The present invention relates to an automatic polishing liquid supply device and a method for using the same, comprising a box body, an upper horizontal plate provided at the upper end of the box body, an opening provided in the middle of the horizontal plate, a mesh cover provided at the opening, an anti-overflow ring provided at the outer edge of the mesh cover, a first bracket provided at a corner of the horizontal plate, and a liquid level gauge installed on the first bracket; a polishing liquid supply device is provided in the box body, the polishing liquid supply device comprises a liquid tank and a driving device; the mouth of the liquid tank is connected to the opening of the horizontal plate; a piston plate is provided in the liquid tank, and the driving device is used to drive the piston plate to move up and down; the liquid tank contains polishing liquid, and when the polishing liquid is supplied, the piston plate moves upward to push the polishing liquid level to the mesh cover; the automatic polishing liquid supply device of the present invention realizes automatic supply of polishing liquid through the optimized design of the driving device, the liquid level gauge, the ball screw, etc., can recover part of the polishing liquid through the mesh cover, and can also complete the cleaning of the wool wheel, with high efficiency, energy saving and low cost.

Description

Technical Field

[0001] The present invention belongs to the field of robot automation, and in particular relates to an automatic polishing liquid supply device for a robot polishing scene and a use method thereof. Background Art

[0002] With the widespread use of robots in industrial applications, users have put forward higher requirements for the automation and intelligence of robots. In the traditional air grinder polishing industry, it mainly relies on manual polishing. The air grinder is manually grasped and a wool felt is glued to the end of the air grinder. Before polishing, the operator is required to spray the polishing liquid evenly on the part of the workpiece that needs to be polished before polishing. This operation method is highly dependent on manual labor and has low efficiency. Since it cannot be quantified, it leads to serious waste of polishing liquid. Some chemical agents are often added to the polishing liquid. Long-term exposure seriously endangers the physical and mental health of the operators. In view of this, there is an urgent need for a technology that can achieve automated polishing and its related supporting equipment.

[0003] The invention patent with the patent number 2020103541207 discloses a pneumatic high-viscosity polishing liquid automatic supply device, in which the pressure is adjusted by an air pressure regulator, and the pressure gauge displays the air pressure value in the barrel; the safety system includes a pressure gauge and a safety valve, and when the air pressure value is greater than the threshold, the safety valve can be opened to adjust the air pressure in the barrel; the alarm system includes a float level gauge, an alarm light, and upper and lower limit sensors of the liquid level; the polishing liquid timing and quantitative adjustment control device adopts a time relay and a flow control valve to electrically connect the timing and quantitative control of the polishing liquid, which can realize automatic, quantitative, long-term and controllable addition of abrasives. However, when this device is applied to the automation field of robots, it cannot achieve uniform, efficient, precise and non-wasteful supply of polishing liquid to the wool wheel at the end of the air grinder. Summary of the Invention

[0004] The purpose of the present invention is to provide a polishing liquid automatic supply device and a use method thereof, which can realize automatic supply of polishing liquid during polishing operation, recycle excess polishing liquid, and realize multiple functions.

[0005] In order to solve the above technical problems, the present invention discloses an automatic polishing liquid supply device, comprising a box body, an upper horizontal plate is provided at the upper end of the box body, an opening is provided in the middle of the horizontal plate, a mesh cover is provided at the opening, an anti-overflow ring is provided at the outer edge of the mesh cover, the upper edge of the anti-overflow ring is higher than the upper end surface of the mesh cover, a first bracket is provided at a corner of the horizontal plate, and a liquid level gauge is installed on the first bracket;

[0006] A polishing liquid supplier is provided in the box body, and the polishing liquid supplier includes a liquid tank and a driving device; the mouth of the liquid tank is connected to the opening of the horizontal plate; a piston plate is provided in the liquid tank, and the driving device is used to drive the piston plate to move up and down; the liquid tank is filled with polishing liquid, and when the polishing liquid is supplied, the piston plate moves upward to push the polishing liquid level to the mesh cover.

[0007] The driving device includes a stepper motor and a ball screw; a lower horizontal plate is provided in the box body, a bearing seat is fixed at the bottom of the lower horizontal plate, a protective ring is provided at the bottom of the bearing seat, a ball nut and a thrust ball bearing are provided in the bearing seat, and the upper part of the ball nut is sleeved in the thrust ball bearing; the lower part of the ball nut is connected to the driven pulley, and a driving pulley is provided on the output shaft of the stepper motor, and the driving pulley and the driven pulley are connected through a synchronous belt transmission; the ball screw passes through the ball nut, the lower horizontal plate and the liquid tank in sequence, and is connected to the piston plate through a fixed seat; the ball nut and the ball screw thread cooperate, and when the stepper motor is running, it drives the piston plate to move upward or downward.

[0008] The liquid level meter is an ultrasonic liquid level sensor that uses the ultrasonic ranging principle to measure the liquid level height; if the polishing liquid level in the liquid tank is lower than the set warning value, the liquid level meter will issue an alarm to prompt the operator to add polishing liquid.

[0009] A plurality of shaft sleeves are arranged around the bearing seat at the bottom of the lower transverse plate. A shaft rod which can slide up and down is arranged in the shaft sleeve. The shaft rod passes through the lower transverse plate upward and is connected to the piston plate through a fixing ring.

[0010] The upper edge of the anti-overflow ring is at least 10 mm higher than the upper horizontal plate.

[0011] The mesh cover includes several spirally coiled tubes, and the upper surface of the tubes is processed with several suction holes for absorbing polishing liquid. The tubes are connected to the suction device, which includes a pump and a filter device. The filter device is connected between the pump and the tubes; the suction device is connected to the liquid tank to re-inject the recovered filtered polishing liquid into the liquid tank for reuse.

[0012] The mesh is composed of a spirally coiled tube, or

[0013] The mesh cover consists of two spirally coiled tubes, one of which is inserted into the gap of the other tube.

[0014] An annular tube is provided on the edge of the mesh cover, and a plurality of liquid suction holes are processed on the upper end surface of the annular tube; the annular tube is connected with the liquid suction device.

[0015] The annular pipe and each pipe are connected to an electrically controlled valve so as to control the annular pipe and each pipe respectively.

[0016] A method for using an automatic polishing liquid supply device, the method for using the automatic polishing liquid supply device being characterized in that an operator adds polishing liquid into a liquid tank, a robot carries a wool wheel at the end to a mesh cover above the automatic polishing liquid supply device, and makes the wool wheel contact the mesh cover, sends a signal to a host computer, the host computer controls the rotation of a stepper motor, and converts the rotation of the stepper motor into an upward linear motion of a piston plate through a ball screw, the movement of the piston plate pushes the polishing liquid surface in the liquid tank to float, and when a liquid level meter detects that the polishing liquid surface reaches a set value, that is, when the polishing liquid surface completely immerses the mesh cover, a command is sent to the host computer, the host computer controls the stepper motor to stop rotating, and after the polishing liquid surface is maintained for 0-2s, the stepper motor is controlled to rotate in the opposite direction, at which time the piston plate moves downward, driving the polishing liquid surface to move down to the initial zero point, and during the downward movement of the piston plate, the host computer controls the movement of the robot, the wool wheel leaves the mesh cover, and the polishing operation begins;

[0017] Recovery of excess polishing liquid: The operator pre-sets the recovery time according to the different materials and structures, and the newness and oldness of the wool wheel; after the wool wheel is replenished with liquid on the mesh cover and the polishing liquid level leaves the mesh cover, when it is necessary to partially recover the excess polishing liquid on the wool wheel, the suction device is started, and the suction holes of the tube or annular tube on the mesh cover absorb part of the polishing liquid on the wool wheel and filter and recover it into the liquid tank; when the suction device is started, the electric control valve controlling the annular tube remains open, and the electric control valve controlling the tube is selectively opened.

[0018] Cleaning of wool wheels: When wool wheels are mixed or there are many impurities on the wool wheels, the wool wheels need to be cleaned every once in a while; during cleaning, the wool wheel contacts the mesh cover, the polishing liquid level completely immerses and maintains the mesh cover, and the liquid suction device starts to absorb the impurities on the wool wheel. During this period, the wool wheel keeps rotating slowly.

[0019] Furthermore, in the present invention, the rubber is fixed to the piston plate by screws. It is circular in shape, with the edge protruding 0.5mm from the piston plate, forming an interference fit with the inner wall of the liquid tank. Under power drive, the piston plate carrying the rubber can move up and down.

[0020] The automatic polishing liquid supply device of the present invention realizes automatic supply of polishing liquid through the optimized design of the driving device, liquid level meter, ball screw, etc., can recover part of the polishing liquid through the mesh cover, and can also complete the cleaning of the wool wheel, which can ensure the high utilization rate of the polishing liquid and the stability of the automatic polishing, and is efficient, stable, energy-saving and low-cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the internal structure of the present invention;

[0023] Figure 3 It is a schematic structural diagram of the driving device of the present invention;

[0024] Figure 4 It is a structural schematic diagram of a mesh cover of the present invention;

[0025] Figure 5 yes Figure 4 Schematic diagram of the three-dimensional structure of the middle tube;

[0026] Figure 6 It is a structural schematic diagram of another mesh cover of the present invention.

[0027] The numbers in the accompanying drawings are: 1, foot, 2, box body, 3, hinge, 4, lower door, 5, lower handle, 6, upper door, 7, upper handle, 8, upper cross plate, 9, anti-overflow ring, 10, mesh cover, 11, first bracket, 12, liquid level gauge, 13, cover, 14, stepper motor, 15, second bracket, 16, lower cross plate, 17, liquid tank, 18, driving pulley, 19, synchronous belt, 20, driven pulley, 21, fixing ring, 22, fixing seat, 23, thrust ball bearing, 24, rubber layer, 25, piston plate, 26, bearing seat, 27, protective ring, 28, bushing, 29, shaft, 30, ball nut, 31, annular cover, 32, ball screw, 33, pipe, 34, suction hole, 35, annular tube. DETAILED DESCRIPTION

[0028] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several variations and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0029] Example 1

[0030] like Figures 1 to 3 As shown, an automatic polishing liquid supply device includes a box body 2, with feet 1 provided at the four corners of the bottom of the box body 2, an upper horizontal plate 8 provided at the upper end of the box body 2, an opening provided in the middle of the horizontal plate 8, a mesh cover 10 provided at the opening, and an anti-overflow ring 9 provided at the outer edge of the mesh cover 10. The upper edge of the anti-overflow ring 9 is higher than the upper end surface of the mesh cover 10. In this embodiment, the anti-overflow ring 9 and the box body 2 are sealed by a rubber sealing ring, and the mesh cover 10 can be fixed on the anti-overflow ring 9 or pressed between the anti-overflow ring 9 and the rubber sealing ring.

[0031] A first bracket 11 is provided at a corner of the horizontal plate 8, and a liquid level meter 12 is installed on the first bracket 11; a cover 13 is fixed on the box body 2, and the box body 2 has an upper door 6 and a lower door 4, which are both connected to the box body 2 through a hinge 3, and an upper handle 7 is provided on the upper door 6, and a lower handle 5 is provided on the lower door 4.

[0032] A polishing liquid supplier is provided in the box body 2, and the polishing liquid supplier includes a liquid tank 17 and a driving device; the mouth of the liquid tank 17 is connected to the opening of the horizontal plate 8; a piston plate 25 is provided in the liquid tank 17, and the driving device is used to drive the piston plate 25 to move up and down; the liquid tank 17 is filled with polishing liquid, and when the polishing liquid is supplied, the piston plate 25 moves upward to push the polishing liquid level to the mesh cover 10. In this embodiment, a rubber layer 24 is provided on the piston plate 25.

[0033] The driving device includes a stepper motor 14 and a ball screw 32; a lower transverse plate 16 is provided in the housing 2, and the stepper motor 14 is mounted on the lower side of the lower transverse plate 16 via a second bracket 15; a bearing seat 26 is fixed to the bottom of the lower transverse plate 16, a protective ring 27 is provided at the bottom of the bearing seat 26, a ball nut 30 and a thrust ball bearing 23 are provided in the bearing seat 26, the upper portion of the ball nut 30 is sleeved in the thrust ball bearing 23, the lower portion of the ball nut 30 is connected to the driven pulley 20, and a bearing pressure plate 27 is provided on the lower side of the thrust ball bearing 23; an annular cover plate 31 is fixed to the lower end of the ball nut 30;

[0034] A driving pulley 18 is provided on the output shaft of the stepper motor 14, and the driving pulley 18 is connected to the driven pulley 20 through a synchronous belt 19; the ball screw 32 passes through the ball nut 30, the lower cross plate 16 and the liquid tank 17 in sequence, and is connected to the piston plate 25 through the fixed seat 22; the ball nut 30 and the ball screw 32 are threadedly matched, and when the stepper motor 14 is running, it drives the piston plate 25 to move upward or downward.

[0035] The liquid level meter 12 is an ultrasonic liquid level sensor that uses the ultrasonic ranging principle to measure the liquid level. If the polishing liquid level in the liquid tank 17 is lower than the set warning value, the liquid level meter 12 will sound an alarm to prompt the operator to add polishing liquid.

[0036] The bottom of the lower transverse plate 16 is provided with a plurality of shaft sleeves 28 around the bearing seat 26 , and a shaft rod 29 that can slide up and down is provided in the shaft sleeve 28 . The shaft rod 29 passes upward through the lower transverse plate 16 and is connected to the piston plate 25 through the fixing ring 21 .

[0037] The upper edge of the anti-overflow ring 9 is at least 10 mm higher than the upper horizontal plate. In this embodiment, the upper edge of the anti-overflow ring 9 is 15 mm higher than the upper horizontal plate.

[0038] The mesh cover is a common stainless steel mesh.

[0039] A method for using an automatic polishing liquid supply device, the method for using the automatic polishing liquid supply device being characterized in that an operator adds polishing liquid to a liquid tank 17, a robot carries a wool wheel at the end to the mesh cover 10 above the automatic polishing liquid supply device, and makes the wool wheel contact the mesh cover 10, sends a signal to a host computer, the host computer controls the stepper motor 14 to rotate, and converts the rotation of the stepper motor into an upward linear motion of a piston plate 25 through a ball screw 32. The upward motion of the piston plate 25 pushes the polishing liquid surface in the liquid tank 17 to float. When the liquid level meter 12 detects that the polishing liquid surface reaches a set value, that is, when the polishing liquid surface completely immerses the mesh cover 10, it sends an instruction to the host computer, the host computer controls the stepper motor 14 to stop rotating, and the polishing liquid surface is maintained for 0-2 seconds (0.5 seconds in this embodiment) and then controls the stepper motor to rotate in the opposite direction. At this time, the piston plate 25 moves downward, driving the polishing liquid surface to move down to the initial zero point. During the downward motion of the piston plate 25, the host computer controls the robot to move, the wool wheel leaves the mesh cover 10, and the polishing operation begins.

[0040] Example 2

[0041] like Figure 4 、 5 As shown, it is similar to Example 1, except that the mesh cover includes a plurality of spirally coiled tubes 33, and a plurality of suction holes 34 for absorbing polishing liquid are processed on the upper surface of the tubes. The tubes 33 are connected to the suction device, which includes a pump and a filter device. The filter device is connected between the pump and the tube; the suction device is connected to the liquid tank to re-inject the recovered filtered polishing liquid into the liquid tank for reuse.

[0042] Described screen is made up of 1 spirally coiled pipe 33. If the screen support strength that forms as pipe is not enough, can add one deck support net under screen.

[0043] An annular tube 35 is provided at the edge of the mesh cover, and a plurality of liquid suction holes are processed on the upper end surface of the annular tube; the annular tube is connected to the liquid suction device.

[0044] The annular tube 35 and each tube 33 are connected to electrically controlled valves. The electrically controlled valves prevent uncontrolled flow of polishing liquid into the annular tube or tubes and facilitate separate control of the annular tube 35 and each tube 33. Polishing liquid at the edge of the wool wheel is most likely to be thrown out by centrifugal force during its rotation, resulting in waste. Therefore, using the annular tube to absorb the polishing liquid at the edge of the wool wheel can effectively reduce waste.

[0045] It is worth noting that the liquid suction holes on the annular tube or the tube can be evenly arranged or arranged with a density gradually decreasing from the outside to the inside along the arc (to absorb more polishing liquid from the edge of the wool wheel). In this embodiment, the liquid suction holes are evenly arranged.

[0046] In practice, it is found that the amount of polishing liquid required for different polishing conditions is different, and due to the differences in the material combination, structure, age, etc. of the wool wheel, the short-term absorption capacity of the polishing liquid is also different. Even if the polishing liquid level is kept at 0-2s for a reasonable time, sometimes the polishing liquid absorbed by the wool wheel is still excessive. At this time, recycling part of the polishing liquid can reduce the waste of polishing liquid and reduce costs.

[0047] Recovery of excess polishing liquid: The operator sets the recovery time in advance based on experience according to the different materials and structures, and the newness and oldness of the wool wheel; after the wool wheel is replenished with liquid on the mesh cover 10 and the polishing liquid level leaves the mesh cover 10, when it is necessary to partially recover the excess polishing liquid on the wool wheel, the suction device is started, and the suction hole 34 of the tube 33 or the annular tube 35 on the mesh cover absorbs a part of the polishing liquid on the wool wheel and filters it and recovers it into the liquid tank 17; when the suction device is started, the electric control valve of the control annular tube 35 remains open, and the electric control valve of the control tube 33 is selectively opened.

[0048] Cleaning the wool wheel: During normal use, the wool wheel generally does not require cleaning, and cleaning is relatively troublesome. For example, when using a paste of polishing wax as the polishing medium, cleaning is very difficult. However, if the wool wheels are mixed (the same wool wheel is used to polish different materials and surfaces of different colors) or if there are many impurities on the wool wheel, appropriate cleaning can be performed at an appropriate time. Because the present invention uses polishing liquid as the polishing medium, the polishing liquid has good fluidity and can be used as a cleaning medium. During cleaning, it can wash away some impurities, thereby achieving a light cleaning of the wool wheel: During cleaning, the wool wheel contacts the mesh cover 10, and the polishing liquid level completely immerses and maintains the mesh cover 10. The electrically controlled valves of the annular tube and the pipe are all opened, and the liquid suction device is activated to absorb the polishing liquid and impurities on the wool wheel. During this period, the wool wheel continues to rotate slowly.

[0049] Example 3

[0050] like Figure 6 The embodiment shown is similar to that of Example 2, except that the mesh is comprised of two spirally coiled tubes 33, one of which is nested within the gap of the other (similar to the arrangement of a mosquito coil). When the amount of polishing fluid to be recovered is small, only one of the two spirally coiled tubes is open. When the amount of polishing fluid to be recovered is large, the electronically controlled valves of both tubes are opened.

[0051] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art may make various variations or modifications within the scope of the claims, which do not affect the essence of the present invention.

Claims

1. A polishing liquid automatic supply device, characterized in that: The invention comprises a box body (2), wherein an upper horizontal plate (8) is provided at the upper end of the box body (2), an opening is provided in the middle of the horizontal plate (8), a mesh cover (10) is provided at the opening, an anti-overflow ring (9) is provided at the outer edge of the mesh cover (10), and the upper edge of the anti-overflow ring (9) is higher than the upper end surface of the mesh cover (10); a first bracket (11) is provided at a corner of the upper horizontal plate (8), and a liquid level gauge (12) is installed on the first bracket (11); A polishing liquid supplier is provided in the housing (2), and the polishing liquid supplier includes a liquid tank (17) and a driving device; the mouth of the liquid tank (17) is connected to the opening of the horizontal plate (8); a piston plate (25) is provided in the liquid tank (17), and the driving device is used to drive the piston plate (25) to move up and down; the liquid tank (17) contains polishing liquid, and when the polishing liquid is supplied, the piston plate (25) moves upward to push the polishing liquid level to the mesh cover (10); the liquid level meter (12) is used to monitor the liquid level of the polishing liquid in the liquid tank (17), and if the polishing liquid level in the liquid tank (17) is lower than the set warning value, the liquid level meter (12) issues an alarm to prompt the operator to add polishing liquid; The mesh cover includes a plurality of spirally wound tubes (33), the upper surface of the tubes being processed with a plurality of suction holes (34) for sucking polishing liquid, the tubes (33) being connected to a suction device, the suction device including a pump and a filter device, the filter device being connected between the pump and the tubes; the suction device being connected to a liquid tank so as to re-inject the recovered filtered polishing liquid into the liquid tank for reuse.

2. The automatic polishing liquid supply device according to claim 1, characterized in that: The driving device includes a stepper motor (14) and a ball screw (32); a lower transverse plate (16) is provided in the box body (2); a bearing seat (26) is fixed at the bottom of the lower transverse plate (16); a protective ring (27) is provided at the bottom of the bearing seat (26); a ball nut (30) and a thrust ball bearing (23) are provided in the bearing seat (26); the upper part of the ball nut (30) is sleeved in the thrust ball bearing (23); the lower part of the ball nut (30) is connected to the driven pulley (20); the stepper motor ( The output shaft of the stepper motor (14) is provided with a driving pulley (18), which is connected to the driven pulley (20) through a synchronous belt (19); the ball screw (32) passes through the ball nut (30), the lower cross plate (16) and the liquid tank (17) in sequence, and is connected to the piston plate (25) through the fixed seat (22); the ball nut (30) and the ball screw (32) are threadedly matched, and when the stepper motor (14) is running, the piston plate (25) is driven to move upward or downward.

3. The automatic polishing liquid supply device according to claim 2, characterized in that: The bottom of the lower transverse plate (16) is provided with a plurality of shaft sleeves (28) around the bearing seat (26), and a shaft rod (29) that can slide up and down is provided in the shaft sleeve (28). The shaft rod (29) passes through the lower transverse plate (16) upward and is connected to the piston plate (25) through a fixing ring (21).

4. The automatic polishing liquid supply device according to claim 1, characterized in that: The upper edge of the anti-overflow ring (9) is at least 10 mm higher than the upper transverse plate (8).

5. The automatic polishing liquid supply device according to claim 1, characterized in that: The mesh is composed of a spirally wound tube (33), or The mesh cover is composed of two spirally wound tubes (33), one of which is sleeved in the gap of the other tube.

6. The automatic polishing liquid supply device according to claim 1, characterized in that: An annular tube (35) is provided at the edge of the mesh cover, and a plurality of liquid suction holes are processed on the upper end surface of the annular tube; the annular tube is connected to the liquid suction device.

7. The automatic polishing liquid supply device according to claim 6, characterized in that: The annular tube (35) and each tube (33) are connected to an electrically controlled valve so as to control the annular tube (35) and each tube (33) respectively.

8. A method for using the automatic polishing liquid supply device according to claim 1, characterized in that: The method for using the automatic polishing liquid supply device is characterized in that an operator adds polishing liquid into the liquid tank (17), the robot carries the wool wheel at the end to the mesh cover (10) above the automatic polishing liquid supply device, and makes the wool wheel contact the mesh cover (10), sends a signal to the host computer, and the host computer controls the stepper motor (14) to rotate, and converts the rotation of the stepper motor into an upward linear motion of the piston plate (25) through the ball screw (32), and the upward motion of the piston plate (25) pushes the polishing liquid in the liquid tank (17) The liquid surface rises, and the liquid level meter (12) detects that the polishing liquid level reaches the set value, that is, when the polishing liquid level completely immerses the mesh cover (10), a command is sent to the host computer, and the host computer controls the stepper motor (14) to stop rotating. After the polishing liquid level is maintained for 0-2 seconds, the stepper motor is controlled to rotate in the opposite direction. At this time, the piston plate (25) moves downward, driving the polishing liquid level to move down to the initial zero point. During the downward movement of the piston plate (25), the host computer controls the robot to move, and the wool wheel leaves the mesh cover (10) to start the polishing operation; Recovery of excess polishing liquid: The operator pre-sets the recovery time according to the different materials and structures and the newness and oldness of the wool wheel; after the wool wheel is replenished with liquid on the mesh cover (10) and the polishing liquid level leaves the mesh cover (10), when it is necessary to partially recover the excess polishing liquid on the wool wheel, the liquid suction device is started, and the liquid suction hole (34) of the pipe (33) or the annular pipe (35) on the mesh cover absorbs a part of the polishing liquid on the wool wheel and filters and recovers it into the liquid tank (17); when the liquid suction device is started, the electric control valve of the control annular pipe (35) is kept open, and the electric control valve of the control pipe (33) is selectively opened; Cleaning of the wool wheel: When the wool wheels are mixed or there are many impurities on the wool wheels, the wool wheels need to be cleaned at regular intervals; during cleaning, the wool wheel contacts the mesh cover (10), the polishing liquid surface completely immerses and maintains the mesh cover (10), and the liquid suction device is started to absorb the impurities on the wool wheel, during which the wool wheel keeps rotating slowly.

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