Sander monitoring unit control device and method

Abstract

The invention relates to the technical field of grinding machining, and discloses a sander monitoring unit control device and method.The sander monitoring unit control device comprises a motor used for driving an abrasive belt wheel, a monitoring unit is arranged at the end of the motor and comprises a fixing sleeve, and the fixing sleeve is fixedly connected with a motor shell; a rotating plate is rotatably mounted in the fixing sleeve, a first torsional spring is arranged in the fixing sleeve, one end of the first torsional spring is connected with the fixing sleeve, the other end of the first torsional spring is connected with the rotating plate, a mounting base is arranged on the rotating plate, a pressing plate used for monitoring the abrasion degree of the abrasive belt is arranged on the mounting base, and an electric push rod used for controlling displacement of the pressing plate is mounted on the mounting base. The pressing plate is connected with the telescopic end of the electric push rod. According to the device, the roughness of the abrasive belt can be monitored under the non-stop condition, the machining efficiency can be improved, the rotating angle of the rotating plate can be visually recorded by observing the reading of the graduated scale corresponding to the pointer, and therefore the monitoring subjectivity is reduced.

Description

Technical Field

[0001] This invention relates to the field of grinding technology, and more specifically, to a control device and method for a sanding machine monitoring unit. Background Technology

[0002] In the field of grinding, sanders are key equipment for achieving grinding. A sander consists of a drive motor and rollers mounted on the drive motor shaft. The rollers are equipped with a sanding belt for grinding. During grinding, the operator brings the workpiece surface into contact with the sanding belt, and the high-speed rotating sanding belt removes burrs, rust, and other impurities from the workpiece surface. Since there is also friction between the workpiece surface and the sanding belt itself, the surface of the sanding belt will gradually become smooth after prolonged use. To ensure the normal grinding function of the sanding belt, periodic roughness monitoring of the sanding belt surface is an important part of the sanding grinding process.

[0003] In the existing technology, the roughness monitoring of the sanding belt on the sander is mainly carried out by manual visual observation. This monitoring method is subjective, and the sander needs to be stopped during the inspection, which affects the normal operation of the sander and reduces the processing efficiency. Therefore, we propose a sander monitoring unit control device and method. Summary of the Invention

[0004] This invention provides a control device and method for a sanding machine monitoring unit. This control device and method can solve the problem mentioned in the background art that when monitoring the roughness of the sanding belt on the sanding machine, the main method is manual visual observation. This monitoring method is subjective, and the sanding machine needs to be stopped during the detection, which affects the normal operation of the sanding machine and reduces the processing efficiency.

[0005] To achieve the above objectives, this solution provides a sander monitoring unit control device and method, including a motor for driving the sanding belt wheel, a monitoring unit provided at the end of the motor, the monitoring unit including a fixed sleeve, the fixed sleeve being fixedly connected to the motor housing, a rotating plate being rotatably installed inside the fixed sleeve, and a first torsion spring being provided inside the fixed sleeve, one end of the first torsion spring being connected to the fixed sleeve, and the other end of the first torsion spring being connected to the rotating plate; The rotating plate is provided with a mounting base, and the mounting base is provided with a pressure plate for monitoring the wear degree of the sanding belt. An electric push rod for controlling the displacement of the pressure plate is installed on the mounting base, and the pressure plate is fixedly connected to the telescopic end of the electric push rod.

[0006] Optionally, a vertical plate is installed at the end of the telescopic rod of the electric push rod, a positioning rod is slidably inserted into the vertical plate, the pressure plate is fixedly connected to the vertical plate, a buffer spring is sleeved on the positioning rod, and the other end of the buffer spring is connected to the vertical plate.

[0007] Optionally, a first groove is provided on the fixed sleeve, and a first slider is slidably installed in the first groove, and the first slider is fixedly connected to the rotating plate.

[0008] Optionally, a pointer is provided on the first slider, and a scale is provided on the fixing sleeve. The scale is located adjacent to the first slide groove, and the pointer is corresponding to the scale.

[0009] Optionally, the mounting base is provided with a second sliding groove, in which a second slider is slidably installed, and the electric push rod is fixedly connected to the second slider; A fixing plate is installed in the mounting base, and a crossbar is slidably inserted on the fixing plate. The other end of the crossbar is connected to the second slider. A reset spring is sleeved on the second slider, and the other end of the reset spring is connected to the fixing plate.

[0010] Optionally, the electric push rod is provided with a connecting rod on its side, and a turntable is rotatably mounted on the other end of the connecting rod. A first wedge block, a second wedge block, and a third wedge block are provided on the turntable. The first wedge block, the second wedge block, and the third wedge block are connected in sequence, and the heights of the first wedge block, the second wedge block, and the third wedge block decrease in sequence. An abutment rod is provided on the mounting base.

[0011] Optionally, a rotating sleeve is provided on the connecting rod, and a ratchet is provided inside the rotating sleeve. Multiple pawls are hinged to the side of the turntable near the rotating sleeve, and the pawls are movably engaged with the ratchet.

[0012] Optionally, a second torsion spring is provided inside the rotating sleeve, one end of which is connected to the connecting rod, and the other end of which is connected to the rotating sleeve.

[0013] Optionally, a lever is provided on the rotating sleeve, and an L-shaped rod is installed on the vertical plate, with the other end of the L-shaped rod abutting against the lever.

[0014] According to a second aspect of this solution, a sander monitoring unit control method is provided, including the sander monitoring unit control device as described above, comprising the following steps: S1. Periodic monitoring: Every 0.5 hours of sanding machine operation, the pressure plate and sanding belt are controlled to fit together once by the electric push rod. The single fitting time between the pressure plate and sanding belt is 5-10 seconds. S2. Roughness Feedback: During each monitoring session, read the scale reading corresponding to the pointer and compare it with the empirical value. The specific steps are as follows: a1. When using a new type of sandpaper for the first time, the roughness of the sanding belt is judged by manually monitoring it after the machine is stopped. When the roughness of the sanding belt is in a critical state, the roughness of the sanding belt in the critical state is monitored by a pressure plate, and the corresponding scale reading is recorded. The reading is taken 3 times, and the average value of the 3 readings is recorded as the empirical value. a2. During routine grinding, periodically monitor the roughness of the abrasive belt and record the readings on the ruler. Take three readings and record the average of the three readings as the monitoring value. Compare the monitoring value with the empirical value. If the monitoring value is greater than the empirical value, the roughness of the abrasive belt is judged to be good; otherwise, the roughness of the abrasive belt is judged to be insufficient. S3. Change the monitoring position: Each periodic monitoring is set to monitor 3 times, and after each monitoring, the relative position between the pressure plate and the sand belt is changed to monitor the roughness of different positions of the sand belt.

[0015] Through the above technical solution, the sander monitoring unit control device and method provided in this solution, when in use: the electric push rod controls the pressure plate to periodically contact the sanding belt. When the sanding belt rotates, it will drive the pressure plate and the rotating plate to deflect against the elastic force of the first torsion spring. According to the size of the deflection angle of the rotating plate, the magnitude of the sliding friction between the pressure plate and the sanding belt is judged, and the roughness of the sanding belt surface is further judged. This device can monitor the roughness of the sanding belt without stopping the machine, which is beneficial to improving processing efficiency. Moreover, by observing the pointer corresponding to the scale reading, the rotation angle of the rotating plate can be recorded intuitively, thereby objectively judging the roughness of the sanding belt and reducing the subjectivity of monitoring. Furthermore, after each monitoring cycle, the telescopic rod of the electric push rod retracts, the vertical plate at the end of the telescopic rod returns to its original position, and the L-shaped rod on the vertical plate abuts against the lever on the rotating sleeve, causing the rotating sleeve to rotate against the force of the second torsion spring. At the same time, the ratchet inside the rotating sleeve engages with the pawl on the turntable, causing the turntable to rotate. As the turntable rotates, the first, second, or third wedge blocks on the turntable take turns abutting against the abutting rod, thereby changing the relative position of the pressure plate and the sanding belt. Therefore, during the next monitoring cycle, the pressure plate can monitor different positions of the sanding belt, improving the accuracy of the monitoring.

[0016] Other features and advantages of this solution will be described in detail in the following detailed implementation section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the following detailed description to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 Appendix to this invention Figure 1 A magnified structural diagram of point A in the middle.

[0019] Figure 3 This is a cross-sectional structural diagram of the rotating plate of the present invention.

[0020] Figure 4 This is a schematic diagram of the installation structure of the electric actuator of the present invention.

[0021] Figure 5 Appendix to this invention Figure 4 A magnified structural diagram at point B in the middle.

[0022] Figure 6 Appendix to this invention Figure 4 A magnified structural diagram at point C.

[0023] Figure 7 This is a schematic diagram of the structure of the turntable of the present invention.

[0024] Figure 8 This is an exploded structural diagram of the turntable and rotating sleeve of the present invention.

[0025] Figure 9 This is a cross-sectional structural diagram of the rotating sleeve of the present invention.

[0026] Explanation of reference numerals in the attached drawings: 101, Motor; 201, Fixed sleeve; 202, Rotating plate; 203, Mounting base; 204, Pressure plate; 205, Electric push rod; 206, Vertical plate; 207, Scale; 208, No. 1 slide groove; 209, No. 1 slider; 210, Pointer; 211, No. 1 torsion spring; 212, Positioning rod; 213, Buffer spring; 301, No. 2 slide groove; 302, No. 2 slider; 303, Fixed plate; 304, Horizontal bar; 305, Turntable; 306, Abutment rod; 307, L-shaped rod; 308, Rotating sleeve; 309, Paddle plate; 310, Connecting rod; 311, Reset tension spring; 312, No. 1 wedge block; 313, No. 2 wedge block; 314, No. 3 wedge block; 315, Pawl; 316, Ratchet; 317, No. 2 torsion spring. Detailed Implementation

[0027] To make the aforementioned objectives, features, and advantages of this solution more apparent and understandable, the specific embodiments of this solution are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this solution. However, this solution can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this solution. Therefore, this solution is not limited to the specific embodiments disclosed below.

[0028] In the description of this solution, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this solution and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this solution. The terms "first" and "second" are used to distinguish one element from another and do not have sequential or importance. Furthermore, in the following description, when referring to the accompanying drawings, the same reference numerals in different drawings indicate the same or similar elements, which will not be repeated here.

[0029] In this solution, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this solution based on the specific circumstances.

[0030] According to some embodiments of this solution, a sander monitoring unit control device is provided, for reference. Figures 1 to 9 As shown, the sander monitoring unit control device includes a motor 101 for driving the sanding belt wheel. A monitoring unit is provided at the end of the motor 101. The monitoring unit includes a fixing sleeve 201, which is fixedly connected to the housing of the motor 101. Figure 4 A rotating plate 202 is rotatably installed inside the fixed sleeve 201. A torsion spring 211 is installed inside the fixed sleeve 201. One end of the torsion spring 211 is connected to the fixed sleeve 201, and the other end of the torsion spring 211 is connected to the rotating plate 202. A mounting seat 203 is provided on the rotating plate 202. A pressure plate 204 for monitoring the wear degree of the sanding belt is provided on the mounting seat 203. An electric push rod 205 for controlling the displacement of the pressure plate 204 is installed on the mounting seat 203. The pressure plate 204 is connected to the telescopic end of the electric push rod 205.

[0031] Thus, during monitoring, the pressure plate 204 is controlled to fit against the sanding belt by the electric push rod 205. Since there is sliding friction between the pressure plate 204 and the sanding belt, the rotation of the sanding belt will cause the pressure plate 204 and the rotating plate 202 to deflect against the elastic force of the first torsion spring 211. The magnitude of the sliding friction between the pressure plate 204 and the sanding belt is judged based on the deflection angle of the rotating plate 202. Specifically, the larger the deflection angle of the rotating plate 202, the greater the sliding friction between the pressure plate 204 and the sanding belt, which means that the surface of the sanding belt is rougher and that the sanding belt has good roughness (can complete the grinding operation). Conversely, it means that the sanding belt has poor roughness (is no longer suitable for grinding).

[0032] It should be noted that the weight of the mounting base 203 may have some influence on the deflection angle of the rotating plate 202. To eliminate this influence, please refer to the following instructions for implementation. Figure 1 A weight balance block can be set on the rotating plate 202. The weight balance block is set on the rotating plate 202 and the mounting base 203 respectively, so as to counteract the influence of the weight of the mounting base 203 on the rotating plate 202.

[0033] Among them, see Figure 4 The telescopic rod end of the electric push rod 205 is equipped with a vertical plate 206. A positioning rod 212 is slidably inserted into the vertical plate 206. The pressure plate 204 is fixedly connected to the vertical plate 206. A buffer spring 213 is sleeved on the positioning rod 212. The other end of the buffer spring 213 is connected to the vertical plate 206.

[0034] Moreover, see Figure 1 A first groove 208 is provided on the fixed sleeve 201, and a first slider 209 is slidably installed in the first groove 208. The first slider 209 is fixedly connected to the rotating plate 202.

[0035] The first slider 209 is equipped with a pointer 210, and the fixed sleeve 201 is equipped with a scale 207. The scale 207 is located adjacent to the first slide groove 208. The pointer 210 is set to correspond with the scale 207. By observing the reading of the pointer 210 corresponding to the scale 207, the rotation angle of the rotating plate 202 can be recorded intuitively.

[0036] This embodiment also proposes a control method for a sander monitoring unit, including the following steps: S1. Periodic monitoring: Every 0.5 hours of sanding machine operation, the pressure plate 204 is controlled to adhere to the sanding belt once by the electric push rod 205. The single adhesion time between the pressure plate 204 and the sanding belt is 5-10 seconds. S2. Roughness Feedback: During each monitoring session, read the scale reading corresponding to pointer 210 on ruler 207 and compare it with the empirical value. The specific steps are as follows: a1. When using a new type of sandpaper for the first time, the roughness of the sanding belt is judged by manual monitoring after the machine is stopped. When the roughness of the sanding belt is in a critical state, the pressure plate 204 is used to monitor the roughness of the sanding belt in the critical state, and the corresponding scale 207 reading is recorded. The reading is taken 3 times, and the average value of the 3 readings is recorded as the empirical value. a2. During routine grinding, periodically monitor the roughness of the abrasive belt and record the readings on scale 207. Take three readings and record the average of the three readings as the monitoring value. Compare the monitoring value with the empirical value. If the monitoring value is greater than the empirical value, the roughness of the abrasive belt is judged to be good; otherwise, the roughness of the abrasive belt is judged to be insufficient. S3. Change the monitoring position: Each periodic monitoring is set to monitor 3 times, and after each monitoring, the relative position between the pressure plate 204 and the sand belt is changed to monitor the roughness of different positions of the sand belt.

[0037] Through the above technical solution, the sander monitoring unit control device and method provided in this solution, when in use, the electric push rod 205 controls the pressure plate 204 to periodically contact the sanding belt. When the sanding belt rotates, it will drive the pressure plate 204 and the rotating plate 202 to deflect against the elastic force of the first torsion spring 211. Based on the deflection angle of the rotating plate 202, the magnitude of the sliding friction between the pressure plate 204 and the sanding belt is determined, and the roughness of the sanding belt surface is further determined. This device can monitor the roughness of the sanding belt without stopping the machine, which is beneficial to improving processing efficiency. Moreover, by observing the reading of the pointer 210 corresponding to the scale 207, the rotation angle of the rotating plate 202 can be recorded intuitively, thereby objectively judging the roughness of the sanding belt, reducing the subjectivity of monitoring, and solving the problem mentioned in the background technology that the roughness monitoring of the sanding belt on the sander is mainly carried out by manual visual observation. This monitoring method is subjective, and the sander needs to be stopped during the detection, which affects the normal operation of the sander and reduces processing efficiency.

[0038] In some implementations of this solution, reference is made to Figure 4 As shown, a second slide groove 301 is provided on the mounting base 203, and a second slider 302 is slidably installed in the second slide groove 301. An electric push rod 205 is fixedly connected to the second slider 302. A fixing plate 303 is installed in the mounting base 203, and a crossbar 304 is slidably inserted on the fixing plate 303. The other end of the crossbar 304 is connected to the second slider 302. A reset spring 311 is sleeved on the second slider 302, and the other end of the reset spring 311 is connected to the fixing plate 303.

[0039] In addition, a connecting rod 310 is provided on the side of the electric push rod 205, and a turntable 305 is rotatably mounted on the other end of the connecting rod 310. A first wedge block 312, a second wedge block 313, and a third wedge block 314 are provided on the turntable 305. The first wedge block 312, the second wedge block 313, and the third wedge block 314 are connected in sequence, and the heights of the first wedge block 312, the second wedge block 313, and the third wedge block 314 decrease in sequence. An abutment rod 306 is provided on the mounting base 203.

[0040] Please refer to the following: Figure 8 A rotating sleeve 308 is provided on the connecting rod 310. A ratchet 316 is provided inside the rotating sleeve 308. Multiple pawls 315 are hinged to the side of the turntable 305 near the rotating sleeve 308. The pawls 315 and the ratchet 316 are movably engaged. The pawls 315 can rotate in one direction through the cooperation of springs. Therefore, the ratchet 316 can only engage with the pawls 315 by rotating in one direction. The pawls 315 and the ratchet 316 are common mechanical engagement methods. The specific structure and principle of the pawls 315 and the ratchet 316 are well known to those skilled in the art and will not be described in detail here.

[0041] For details, see Figure 8 When the rotating sleeve 308 rotates clockwise, the pawl 315 engages with the ratchet 316, causing the rotating sleeve 308 to drive the turntable 305 to rotate. When the rotating sleeve 308 rotates counterclockwise, the pawl 315 and the ratchet 316 do not engage, so the rotating sleeve 308 will not drive the turntable 305 to rotate at this time. It should be noted that when the rotating sleeve 308 rotates counterclockwise, the teeth on the ratchet 316 will successively pass over the pawl 315. Since there is friction between the contact rod 306 and the first wedge block 312, the second wedge block 313, or the third wedge block 314, when the rotating sleeve 308 rotates counterclockwise, the teeth on the ratchet 316 passing over the pawl 315 will not cause the turntable 305 to rotate.

[0042] Furthermore, please refer to Figure 9 The rotating sleeve 308 is equipped with a second torsion spring 317. One end of the second torsion spring 317 is connected to the connecting rod 310, and the other end of the second torsion spring 317 is connected to the rotating sleeve 308.

[0043] See Figure 4 A lever 309 is provided on the rotating sleeve 308, and an L-shaped rod 307 is installed on the vertical plate 206. The other end of the L-shaped rod 307 abuts against the lever 309.

[0044] Therefore, after each monitoring, the telescopic rod of the electric push rod 205 is retracted, the vertical plate 206 at the end of the telescopic rod of the electric push rod 205 is reset, and at the same time, the L-shaped rod 307 on the vertical plate 206 abuts against the lever 309 on the rotating sleeve 308, so that the rotating sleeve 308 rotates against the elastic force of the second torsion spring 317. At the same time, the ratchet 316 inside the rotating sleeve 308 engages with the pawl 315 on the turntable 305, so that the turntable 305 rotates. When the turntable 305 rotates, the first wedge block 312, the second wedge block 313 or the third wedge block 314 on the turntable 305 take turns abutting against the abutting rod 306.

[0045] Specifically, in the initial state, the contact rod 306 contacts the third wedge block 314. After each monitoring, the turntable 305 changes position, and the contact rod 306 contacts the second wedge block 313. Through the squeezing of the contact rod 306, the turntable 305, connecting rod 310, electric push rod 205, and pressure plate 204 move away from the contact rod 306 (while the reset spring 311 is compressed), which changes the relative position of the pressure plate 204 and the sanding belt. Therefore, in the next monitoring, the pressure plate 204 can monitor different positions of the sanding belt, improving the accuracy of the monitoring.

[0046] It should be noted that if the current contact rod 306 is in contact with the first wedge block 312, then after the current monitoring, the turntable 305 will rotate, the contact rod 306 will no longer be in contact with the first wedge block 312, the reset spring 311 will be released, the turntable 305, connecting rod 310, electric push rod 205, and pressure plate 204 will reset, and the contact rod 306 will re-engage with the third wedge block 314.

[0047] Working principle: Please refer to Figure 4 The telescopic rod of the electric push rod 205 moves to the right and retracts. At the same time, the L-shaped rod 307 on the vertical plate 206 abuts against the lever 309 on the rotating sleeve 308, causing the rotating sleeve 308 to rotate against the elastic force of the second torsion spring 317. Simultaneously, the ratchet 316 inside the rotating sleeve 308 engages with the pawl 315 on the turntable 305, causing the turntable 305 to rotate. When the turntable 305 rotates, the first wedge block 312, the second wedge block 313, or the third wedge block 314 on the turntable 305 take turns abutting against the abutment rod 306. Because the heights of wedge block 312, wedge block 313, and wedge block 314 are different, after the turntable 305 rotates, it is displaced along the length of the contact rod 306 under the contact of the contact rod 306. This displacement is further caused by the connecting rod 310, which in turn causes the pressure plate 204 to move, thereby changing the relative position of the pressure plate 204 and the sanding belt. During the next monitoring, the contact position between the pressure plate 204 and the sanding belt changes, thus allowing for more accurate monitoring of the roughness of the sanding belt at specific locations.

[0048] The preferred embodiments of this solution have been described in detail above with reference to the accompanying drawings. However, this solution is not limited to the specific details in the above embodiments. Within the scope of the technical concept of this solution, various simple modifications can be made to the technical solution, and these simple modifications all fall within the protection scope of this solution.

[0049] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, this solution will not describe the various possible combinations separately.

[0050] Furthermore, various implementations of this solution can be combined in any way, as long as they do not violate the spirit of this solution, they should also be regarded as the content disclosed in this solution.

Claims

1. A sander monitoring unit control device, comprising a motor (101) for driving the sanding belt wheel, characterized in that: A monitoring unit is provided at the end of the motor (101). The monitoring unit includes a fixed sleeve (201), which is fixedly connected to the housing of the motor (101). A rotating plate (202) is rotatably installed inside the fixed sleeve (201). A torsion spring (211) is provided inside the fixed sleeve (201). One end of the torsion spring (211) is connected to the fixed sleeve (201), and the other end of the torsion spring (211) is connected to the rotating plate (202). The rotating plate (202) is provided with a mounting base (203), the mounting base (203) is provided with a pressure plate (204) for monitoring the wear degree of the sanding belt, and the mounting base (203) is provided with an electric push rod (205) for controlling the displacement of the pressure plate (204). The pressure plate (204) is connected to the telescopic end of the electric push rod (205).

2. The sander monitoring unit control device according to claim 1, characterized in that: The telescopic rod end of the electric push rod (205) is equipped with a vertical plate (206), a positioning rod (212) is slidably inserted on the vertical plate (206), the pressure plate (204) is fixedly connected to the vertical plate (206), a buffer spring (213) is sleeved on the positioning rod (212), and the other end of the buffer spring (213) is connected to the vertical plate (206).

3. The sander monitoring unit control device according to claim 1, characterized in that: The fixed sleeve (201) has a first groove (208), and a first slider (209) is slidably installed in the first groove (208). The first slider (209) is fixedly connected to the rotating plate (202).

4. The sander monitoring unit control device according to claim 3, characterized in that: A pointer (210) is provided on the first slider (209), and a scale (207) is provided on the fixed sleeve (201). The scale (207) is located adjacent to the first slide groove (208), and the pointer (210) is correspondingly located to the scale (207).

5. The sander monitoring unit control device according to claim 1, characterized in that: The mounting base (203) is provided with a second slide groove (301), and a second slider (302) is slidably installed in the second slide groove (301). The electric push rod (205) is fixedly connected to the second slider (302). A fixing plate (303) is installed in the mounting base (203). A crossbar (304) is slidably inserted on the fixing plate (303). The other end of the crossbar (304) is connected to the second slider (302). A reset spring (311) is sleeved on the second slider (302). The other end of the reset spring (311) is connected to the fixing plate (303).

6. The sander monitoring unit control device according to claim 2, characterized in that: The electric push rod (205) is provided with a connecting rod (310) on its side. The other end of the connecting rod (310) is rotatably mounted with a turntable (305). The turntable (305) is provided with a first wedge block (312), a second wedge block (313), and a third wedge block (314). The first wedge block (312), the second wedge block (313), and the third wedge block (314) are connected in sequence, and the heights of the first wedge block (312), the second wedge block (313), and the third wedge block (314) decrease in sequence. The mounting base (203) is provided with an abutment rod (306).

7. The sander monitoring unit control device according to claim 6, characterized in that: A rotating sleeve (308) is provided on the connecting rod (310), and a ratchet (316) is provided inside the rotating sleeve (308). A plurality of pawls (315) are hinged on the side of the turntable (305) near the rotating sleeve (308), and the pawls (315) are engaged with the ratchet (316).

8. The sander monitoring unit control device according to claim 7, characterized in that: The rotating sleeve (308) is provided with a second torsion spring (317). One end of the second torsion spring (317) is connected to the connecting rod (310), and the other end of the second torsion spring (317) is connected to the rotating sleeve (308).

9. The sander monitoring unit control device according to claim 8, characterized in that: A lever (309) is provided on the rotating sleeve (308), and an L-shaped rod (307) is installed on the vertical plate (206). The other end of the L-shaped rod (307) abuts against the lever (309).

10. A control method for a sander monitoring unit, characterized in that: The sander monitoring unit control device according to any one of claims 1-9 includes the following steps: S1. Periodic monitoring: Every 0.5 hours of sanding machine operation, the pressure plate (204) is controlled to fit with the sanding belt once by the electric push rod (205). The single fitting time between the pressure plate (204) and the sanding belt is 5-10 seconds. S2. Roughness Feedback: During each monitoring, the reading of the scale (207) corresponding to the pointer (210) is read and compared with the empirical value. The specific steps are as follows: a1. When using a new type of sandpaper for the first time, the roughness of the sanding belt is judged by manual monitoring during machine shutdown. When the roughness of the sanding belt is in a critical state, the pressure plate (204) is used to monitor the roughness of the sanding belt in the critical state, and the corresponding scale (207) reading is recorded. The reading is taken 3 times, and the average value of the 3 readings is recorded as the empirical value. a2. During routine grinding, periodically monitor the roughness of the abrasive belt and record the reading of the scale (207). Take three readings and record the average of the three readings as the monitoring value. Compare the monitoring value with the empirical value. If the monitoring value is greater than the empirical value, it is determined that the roughness of the abrasive belt is good; otherwise, it is determined that the roughness of the abrasive belt is insufficient. S3. Change the monitoring position: Each periodic monitoring is set to monitor 3 times, and after each monitoring, the relative position between the pressure plate (204) and the sand belt is changed to monitor the roughness of the sand belt at different positions.

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