Roller cycle foreign matter cleaning mechanism based on machine vision

Abstract

The utility model discloses a kind of roll periodic foreign matter cleaning mechanism based on machine vision, including vision detection system is used to detect the foreign matter or periodic defect on the surface of roll online, and obtain the mechanical coordinates of the foreign matter or defect;Mobile positioning assembly includes longitudinal moving mechanism, transverse moving mechanism, lifting mechanism and the servo motor of driving each mechanism, servo motor connects vision detection system, each mechanism and servo motor cooperation make roll wiping cleaning assembly move to the roll surface position corresponding to mechanical coordinates;Roll wiping cleaning assembly includes wiping paper take-up mechanism, infiltration structure and polishing paste extrusion structure.The utility model takes the detection of machine vision as the basis, through the synergic cooperation of mobile positioning assembly and roll wiping cleaning assembly, the accurate positioning and directional cleaning of roll surface foreign matter and periodic defect are realized, avoid the damage of roll surface due to wiping roll surface unreasonable, can be widely applied to the foreign matter cleaning work of various high-precision mirror surface roll.

Description

Technical Field

[0001] This utility model relates to a machine vision-based roller periodic foreign object cleaning mechanism, specifically an automated device that accurately identifies and directionally cleans foreign objects on the roller surface based on machine vision, belonging to the field of roller surface cleaning technology. Background Technology

[0002] In the film production process, especially in the biaxial stretching process, the casting roller is one of the key components of the entire process. Its function is to rapidly and uniformly cool the high-temperature molten raw material extruded from the die head, thereby forming a casting with uniform thickness and stable structure. This is the basis for subsequent longitudinal and transverse stretching, and its quality directly determines the performance of the final film product.

[0003] In the casting process of thin film production, the surface cleanliness of the casting rollers has a decisive impact on film quality, especially in high-end applications such as optical films. Any surface defects or fluctuations in internal performance can lead to substandard products. Therefore, ensuring the cleanliness of the casting rollers is a core aspect of production control. However, in actual production, the surface of the casting rollers is often plagued by various foreign matter contaminations, mainly including low molecular weight additives or oligomers precipitated from the resin melt, as well as dust and suspended particles from the production environment. These tiny foreign matter adhering to the roller surface can form a corresponding "bump" or defect on the film surface, which can be amplified in subsequent stretching processes, easily causing quality problems such as film breakage, fisheyes, and crystal points. In addition, the adhesion of foreign matter can also hinder local heat conduction in that area, leading to uneven cooling of the film, thereby affecting its crystallization behavior and microstructure uniformity, ultimately adversely affecting the overall physical and optical properties of the film.

[0004] Currently, roller surface cleaning technology has received widespread attention. For example, Chinese patent CN114289366A proposes a wiping device with radial drive and synchronous dust suction functions. This device uses hydraulic control to move the wiping roller radially along the working roller, and works in conjunction with a suction hood and dust removal system to achieve online cleaning and dust extraction. It can complete cleaning without affecting the roller surface and strip quality. However, the cleaning objects and working conditions of this device are significantly different from those of film casting rollers, making it difficult to apply to optical-grade film production environments. On the one hand, the online suction system can easily interfere with the airflow organization of the clean space, which may lead to more dust and foreign objects adhering to the roller surface. On the other hand, optical-grade casting rollers have extremely high precision requirements, and even slight wiping or contact may cause irreversible damage. Therefore, the polishing approach using polishing rollers is not suitable for such high-precision scenarios.

[0005] For example, Chinese patent CN216420313U proposes a real-time foreign matter removal device for roll film production. This device mainly consists of a support mechanism, a guide roller assembly, a translational transmission mechanism, first and second mounting mechanisms, and a decontamination mechanism. The guide roller assembly is mounted on top of the support mechanism to guide the roll film movement; the translational transmission mechanism drives the first and second mounting mechanisms to move; and the decontamination mechanism is installed between the two. Its core decontamination component is a special blade. By keeping its blade in contact with the roll film surface, it can continuously remove the debris attached to the surface during the roll film's movement, aiming to achieve continuous online cleaning without stopping the machine, thus ensuring production efficiency and product surface quality. However, this device is still difficult to apply to the cleaning of optical-grade thin-film casting rollers. Foreign matter on the surface of optical-grade casting rollers is usually at the micron level. If the blade in this device is used for removal, it is very easy to cause scratches or even permanent damage to the roller surface upon contact, which cannot meet the extremely high precision mirror surface environment required for optical-grade thin-film rollers.

[0006] In addition, Chinese patent CN222469926U discloses an online roller surface cleaning device, aiming to solve the problems of low efficiency, poor safety, and unstable results of manual wiping. This device mainly consists of a guide rail section, a sliding section, a roller surface wiping section, and a power unit. The guide rail section is fixed to both ends of the trough, and the sliding section can slide along its track; the roller surface wiping section is mounted on the sliding section and moves synchronously with it, its surface wrapped with corrosion-resistant non-woven fabric; the power unit drives the sliding section to reciprocate. Through the coordinated operation of the above mechanisms, this device can achieve rapid, multiple, automated cleaning of the roller surface after a single button start. It is not only simple to operate and highly efficient, but also keeps the roller surface clean for a long time, thereby ensuring the quality stability of film production. This device is also unsuitable for optical-grade thin-film casting rollers. First, the non-woven fabric it uses is prone to deformation and shrinkage when in contact with the roller surface, which reaches temperatures as high as 100°C, leading to sudden changes in local hardness and posing a significant risk of scratching the high-precision mirror roller. Second, the device lacks a precise pressure sensing and control system, making it impossible to ensure that the wiping force is always within a safe threshold, which can easily cause scratches or impacts. Finally, its reciprocating lateral wiping trajectory is extremely unreasonable. In cleaning optical-grade roller surfaces, lateral movement can easily cause micron-sized foreign objects to scratch the mirror surface. Therefore, a precisely positioned longitudinal wiping method must be adopted. Utility Model Content

[0007] To address the lack of dedicated cleaning devices for high-precision mirror rollers (such as optical-grade thin-film casting rollers) in existing technologies, this invention provides a machine vision-based roller periodic foreign object cleaning mechanism. Using machine vision detection as a basis, and through the coordinated operation of a moving positioning component and a roller wiping and cleaning component, it achieves precise positioning and directional cleaning of foreign objects and periodic defects on the roller surface. This significantly reduces costs, minimizes pollution, and avoids personal injury. Because it uses a wiping paper strip for mechanical wiping, the wiping force can be quantified, further preventing damage to the roller surface caused by improper wiping. It can be widely applied to foreign object cleaning of various high-precision mirror rollers.

[0008] This utility model is achieved through the following technical solution: a roller periodic foreign object cleaning mechanism based on machine vision, comprising a vision detection system, a motion positioning component, and a roller wiping and cleaning component. The vision inspection system is used to detect foreign objects or periodic defects on the surface of the roller online and to obtain the mechanical coordinates of the foreign objects or defects. The mobile positioning component includes a longitudinal moving mechanism, a lateral moving mechanism, a lifting mechanism, and a servo motor that drives each mechanism. The servo motor is connected to a vision inspection system. The longitudinal moving mechanism, the lateral moving mechanism, the lifting mechanism, and the servo motor work together to move the roller wiping and cleaning component to the roller surface position corresponding to the mechanical coordinates. The roller wiping and cleaning assembly is mounted on the lifting mechanism of the moving positioning assembly. It includes a wiping paper receiving and releasing mechanism, an impregnation structure, and a polishing paste extrusion structure. The wiping paper receiving and releasing mechanism is used to support and drive the wiping paper belt. The impregnation structure is provided with an impregnation liquid channel for conveying and adhering a high-flow-rate impregnation liquid to the wiping paper. The polishing paste extrusion structure is provided with a polishing paste channel and a scraper for uniformly extruding a low-flow-rate polishing paste onto the wiping paper.

[0009] The longitudinal moving mechanism includes a longitudinal slide rail arranged along the roller drive direction and a longitudinal slider that moves along the longitudinal slide rail; the transverse moving mechanism includes a transverse slide rail arranged along the roller axis and a transverse slider that moves along the transverse slide rail, the transverse slide rail being mounted on the longitudinal slider and the lifting mechanism being mounted on the transverse slider.

[0010] The servo motor includes a first high-precision servo motor, a second high-precision servo motor, and a third high-precision servo motor, which are respectively connected to the vision inspection system. The first high-precision servo motor drives the vertical slider; the second high-precision servo motor drives the horizontal slider; and the third high-precision servo motor drives the lifting mechanism.

[0011] The wiping paper feeding and receiving mechanism includes two rotating disks and a receiving and receiving motor. The two rotating disks are used for feeding and receiving paper respectively, and the receiving and receiving motor controls the rotation and feeding and receiving of the wiping paper belt.

[0012] The wetting structure also includes a first supply motor that connects to the wetting liquid flow channel and controls the delivery of the wetting liquid.

[0013] The polishing paste extrusion structure also includes a second supply motor that connects to the polishing paste flow channel and controls the extrusion of the polishing paste.

[0014] The polishing paste extrusion structure also includes a collection groove with a matching scraper to collect excess polishing paste.

[0015] The roller wiping and cleaning assembly also includes an infrared sensor for detecting the distance between the wiping head and the roller surface.

[0016] The roller wiping and cleaning assembly also includes a pressure sensor that detects the wiping force on the roller surface.

[0017] Compared with the prior art, this utility model has the following advantages and beneficial effects: (1) This utility model relies on the machine vision system to accurately identify and locate foreign objects and periodic defects. Combined with a three-dimensional moving platform (moving mechanism, lateral moving mechanism and lifting mechanism) driven by a high-precision servo motor, it can automatically and accurately move the cleaning components to the target position, realizing the leap from "surface cleaning" to "point treatment", avoiding unnecessary full roller surface contact and wear, and achieving precise positioning and directional cleaning.

[0018] (2) This utility model can effectively protect the roller surface. Through the synergistic effect of infrared sensor and pressure sensor, it realizes real-time monitoring and closed-loop control of the distance between the wiping head and the roller surface and the wiping pressure, ensuring that the cleaning force is always within the safe threshold, fundamentally eliminating the risk of scratching or colliding with the high-value mirror roller surface due to improper force.

[0019] (3) This utility model can accurately adapt to different roller surface cleaning conditions. Through the integrated wetting structure and polishing paste extrusion structure of the roller wiping and cleaning component, it can select and deliver high-flow-rate wetting liquid or low-flow-rate polishing paste according to the nature of foreign matter (dust adhesion or slight dents and scratches). It can also achieve precise control of the amount of medium through high-precision supply motor and scraper structure, which not only ensures the cleaning effect, but also avoids secondary pollution.

[0020] (4) This utility model achieves complete automation of the cleaning process, eliminating the need for operators to enter the equipment for high-risk manual operations and completely eliminating personal safety risks. At the same time, this targeted cleaning method greatly reduces the waste of cleaning consumables and product scrap caused by inaccurate wiping, resulting in a significant reduction in overall operating costs.

[0021] (5) The present invention has a reasonable structural design and precise control, and is especially suitable for scenarios with extremely high requirements for cleanliness and equipment protection, such as optical-grade film production lines. However, its application is not limited to this and can also be widely used in the online maintenance of various high-precision mirror rollers. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model (I).

[0023] Figure 2 This is a schematic diagram of the result of this utility model (II).

[0024] Figure 3 This is a schematic diagram of the structure of the roller wiping and cleaning assembly described in this utility model.

[0025] Figure 4 This is a schematic diagram of the working process of this utility model.

[0026] Among them, 1—longitudinal moving mechanism, 1-1—longitudinal slide rail, 1-2—longitudinal slider, 2—lateral moving mechanism, 2-1—lateral slide rail, 2-2—lateral slider, 3—lifting mechanism, 4—servo motor, 5—roller wiping and cleaning assembly, 5-1—wiping paper receiving and discharging mechanism, 5-101—rotary disk, 5-102—receiving and discharging motor, 5-2—immersion structure, 5-201—immersion liquid channel, 5-202—first supply motor, 5-3—polishing paste extrusion structure, 5-301—polishing paste channel, 5-302—scraper, 5-303—second supply motor, 5-304—collection tank, 5-4—wiping paper, 5-5—infrared sensor, 5-6—pressure sensor, 5-7—limiter. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0028] Example: This embodiment relates to a machine vision-based roller periodic foreign object removal mechanism. The mechanism mainly consists of three parts: a vision inspection system, a motion positioning component, and a roller wiping and cleaning component 5. The vision inspection system accurately locates the position of foreign objects or periodic defects on the roller surface. Then, the motion positioning component and the roller wiping and cleaning component 5 work together to initiate directional cleaning. This mechanism effectively avoids contamination problems that may arise from manual entry into the operating environment, overcomes the impact on film quality caused by inaccurate wiping positions, and eliminates safety hazards during manual roller wiping.

[0029] Specifically, the vision inspection system can be installed at the longitudinal rear end of the material in the production line for online real-time inspection of the surface of the running rollers. It can acquire and identify periodically arranged defects caused by foreign objects using high-precision cameras and other equipment, and obtain the mechanical coordinates of the detected foreign objects or defects. The detection principle is as follows: the system analyzes whether the longitudinal intervals of the defects on the film surface are consistent with the circumference of a specific roller to determine whether the defect originates from a foreign object on the roller surface. Once such a periodic defect or a single foreign object is identified, the system immediately calculates its precise coordinates in the mechanical coordinate system. For example, a high-precision camera and its matching image processor can be used. The high-precision camera is used to acquire film images online and then transmit them to the image processor for analysis, which can identify foreign objects based on preset foreign object characteristics. The image processor pre-stores the coordinate transformation relationship from the camera pixel coordinate system to the mechanical coordinate system of the moving positioning component. Through this transformation relationship, the image processor can calculate the mechanical coordinates corresponding to the identified foreign object in the mechanical coordinate system. For the field of vision inspection, high-precision cameras, image processors, and the establishment of the above coordinate transformation relationship through calibration are all known technologies and will not be elaborated upon in this embodiment.

[0030] The coordinate data is transmitted in real time to the control system of the mobile positioning component. The control system, such as a high-precision servo motor (i.e., servo motor 4), controls the longitudinal moving mechanism, the lateral moving mechanism 2 and the lifting mechanism 3 to move, thereby enabling the roller wiping and cleaning component 5 to move precisely to the target position corresponding to the roller that needs to be cleaned in the production line, and to clean foreign objects or defects.

[0031] See Figure 1 and Figure 2 As shown, the longitudinal movement mechanism 1, the lateral movement mechanism 2, and the lifting mechanism 3 together constitute a three-dimensional Cartesian coordinate robot. Specifically, the longitudinal movement mechanism 1 includes a longitudinal slide rail 1-1 arranged along the roller transmission direction (i.e., the film travel direction) and a longitudinal slider 1-2 that can move along it. The lateral movement mechanism 2 includes a lateral slide rail 2-1 arranged along the roller axis and a lateral slider 2-2, wherein the lateral slide rail 2-1 is fixedly mounted on the longitudinal slider 1-2 and can move longitudinally together with the longitudinal slider 1-2. The lifting mechanism 3 is mounted on the lateral slider 2-2 and can move laterally with the lateral slider 2-2.

[0032] To achieve precise orientation and movement of the three-dimensional Cartesian coordinate robot, the control system receives coordinate data from the vision inspection system (more specifically, the image processor of the vision inspection system transmits the coordinates of the foreign object pixels it identifies to the control system, and the control system converts them into coordinate data in a three-dimensional coordinate system through a coordinate transformation matrix), and converts the vertical coordinates in the coordinate data into vertical movement commands, which are sent to the first high-precision servo motor to drive the movement of the vertical slider 1-2; the horizontal coordinates in the coordinate data are converted into horizontal movement commands, which are sent to the second high-precision servo motor to drive the movement of the horizontal slider 2-2; the height coordinates in the coordinate data are converted into lifting commands, which are sent to the third high-precision servo motor, thereby controlling the lifting mechanism 3 to perform actions, ultimately realizing the lifting and lowering of the wiping head on the roller wiping cleaning assembly 5.

[0033] In this embodiment, the roller wiping and cleaning assembly 5 is mounted on the lifting mechanism 3 of the moving positioning assembly, and rises or falls with the lifting mechanism 3. Specifically, it consists of a base plate and a wiping paper receiving and discharging mechanism 5-1, an impregnation structure 5-2, and a polishing paste extrusion structure 5-3 mounted on the base plate. See also Figure 3 As shown, the substrate is vertically mounted on the lifting mechanism 3 and moves with the lifting mechanism 3; the wiping paper receiving and discharging mechanism 5-1 supports and drives the wiping paper tape, including two rotating disks 5-101 and a receiving and discharging motor 5-102. The two rotating disks 5-101 are located on one side of the substrate. One rotating disk 5-101 is used to release the wiping paper tape (clean, pure wood pulp dust-free paper), and the other rotating disk 5-101 is used to collect the wiping paper tape (used, soiled paper tape). This is controlled by the receiving and discharging motor 5-102 (e.g., ...). Figure 3 As shown, the paper belt can be controlled via a belt pulley drive to achieve intermittent or continuous feeding, ensuring that clean paper is used for each cleaning.

[0034] The wetting structure 5-2 is located on the top of the substrate. The main body of this structure is a stainless steel part with internally machined wetting liquid channels 5-201. Its top outlet is made of high-temperature resistant rubber material, which is used to transport and adhere high-flow wetting liquid (such as acetone, suitable for cleaning dust adhesion) onto the wiping paper 5-4. The polishing paste extrusion structure 5-3 is located on one side of the wetting structure 5-2. This structure has an independent polishing paste channel 5-301, a stainless steel scraper 5-302, and a collection tank 5-304, which is used to evenly extrude low-flow polishing paste (suitable for polishing minor dents or scratches on mirror rollers) onto the wiping paper 5-4.

[0035] In practical use, the high-flowability wetting liquid and the low-flowability polishing paste are controlled by two high-precision metering pumps located at the bottom of the substrate (driven by a first supply motor 5-202 and a second supply motor 5-303, respectively). When the vision inspection system detects foreign objects or dust adhering to the roller surface, the first supply motor 5-202 (driving a micro-motion injection pump) precisely controls the high-flowability wetting liquid to seep out through the internal wetting liquid channel 5-201 from the high-temperature resistant rubber outlet at the top (e.g., Figure 3 (As shown in position A) The wiping paper tape contacts the outlet during its journey, thereby evenly absorbing the wetting liquid. Then, the wetted wiping paper tape cleans any foreign matter or dust adhering to it. When the mirror roller shows slight dents or scratches, the second supply motor 5-303 (driving the extrusion pump) precisely controls the low-flow polishing paste, which is then extruded from one side of the wetting structure 5-2 onto the wiping paper tape after passing through the polishing paste flow channel 5-301 (as shown in position A). Figure 3 (As shown in position B), the extruded polishing paste is then scraped flat by the doctor blade 5-302, so that it is evenly and thinly adhered to the paper tape. The collection groove 5-304 is used to receive the excess return polishing paste on the doctor blade 5-302 to prevent it from dripping and contaminating the roller surface.

[0036] To improve the reliability and safety of this device, an infrared sensor 5-5, a pressure sensor 5-6, and a limiter 5-7 are respectively installed on the base plate. The infrared sensor 5-5 (or distance sensor) is used to detect the distance between the wiping head and the paper on the mirror roller in real time, ensuring that they maintain the optimal cleaning distance. It can be installed on the wetting structure 5-2. The pressure sensor 5-6 is used to provide real-time feedback and control the force of the wiping head acting on the roller surface, preventing scratches from excessive pressure or incomplete cleaning from insufficient pressure. It can be installed at the lower part of the wetting structure 5-2. The limiter 5-7 serves as the final physical safety guarantee. In the event of accidental failure of both the pressure sensor 5-6 and the infrared sensor 5-5, it can forcefully prevent the wiping head from continuing to advance, avoiding damage to the mirror roller.

[0037] See Figure 4 As shown, the working process of the cleaning mechanism described in this embodiment is as follows: (1) When the vision inspection system detects foreign objects or periodic defects on the roller surface online, it immediately sends the mechanical coordinates of the defect to the servo mechanism of the moving positioning component.

[0038] (2) The servo mechanism controls the longitudinal movement mechanism 1, the lateral movement mechanism 2, and the lifting mechanism 3 to work together according to the mechanical coordinates of the defect, so as to move the roller wiping and cleaning component 5 quickly and accurately to the designated position of the target roller.

[0039] (3) After the roller wiping and cleaning assembly 5 is in place, the lifting mechanism 3, under the closed-loop control of the infrared sensor 5-5 and the pressure sensor 5-6, presses the wiping paper tape with the cleaning medium attached to the roller surface at a safe distance and pressure. At the same time, the take-up and discharge motor 5-102 drives the paper tape to move slowly to achieve continuous and uniform cleaning operation.

[0040] During cleaning, if dust or foreign objects are adhering to the surface, the system activates the wetting structure 5-2, and the first supply motor 5-202 delivers a measured amount of highly fluid wetting liquid to the wiping paper tape for dissolving and cleaning the foreign objects. If there are minor dents or scratches, the system activates the polishing paste extrusion structure 5-3, and the second supply motor 5-303 extrudes a measured amount of low-fluidity polishing paste, which is then evenly applied to the wiping paper tape by the scraper 5-302 for fine polishing of the defects.

[0041] (4) After cleaning is completed, the cleaning component is raised and moved back to the initial position, waiting for the next instruction.

[0042] Therefore, this embodiment, through the above-mentioned hardware and software collaborative design, achieves precise positioning, directional cleaning, quantitative control, and fully automated operation of high-precision mirror rollers, effectively solving many problems of inaccurate cleaning, easy damage to the roller surface, and high personal safety hazards in existing technologies. It is particularly suitable for high-end manufacturing fields such as optical-grade thin film production lines.

[0043] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A machine vision-based roller periodic foreign object cleaning mechanism, characterized in that: It includes a vision inspection system, a motion positioning component, and a roller wiping and cleaning component (5). The vision inspection system is used to detect foreign objects or periodic defects on the surface of the roller online and to obtain the mechanical coordinates of the foreign objects or defects. The mobile positioning component includes a longitudinal moving mechanism (1), a lateral moving mechanism (2), a lifting mechanism (3), and a servo motor (4) that drives each mechanism. The servo motor (4) is connected to the vision inspection system. The longitudinal moving mechanism (1), the lateral moving mechanism (2), the lifting mechanism (3), and the servo motor (4) work together to move the roller wiping and cleaning component (5) to the roller surface position corresponding to the mechanical coordinates. The roller wiping and cleaning assembly (5) is mounted on the lifting mechanism (3) of the moving positioning assembly. It includes a wiping paper receiving and releasing mechanism (5-1), an impregnation structure (5-2), and a polishing paste extrusion structure (5-3). The wiping paper receiving and releasing mechanism (5-1) is used to support and drive the wiping paper belt. The impregnation structure (5-2) is provided with an impregnation liquid channel (5-201) for conveying and adhering the high-flow impregnation liquid to the wiping paper (5-4). The polishing paste extrusion structure (5-3) is provided with a polishing paste channel (5-301) and a scraper (5-302) for uniformly extruding the low-flow polishing paste onto the wiping paper (5-4).

2. The roller periodic foreign matter cleaning mechanism according to claim 1, characterized in that: The longitudinal moving mechanism (1) includes a longitudinal slide rail (1-1) arranged along the roller transmission direction and a longitudinal slider (1-2) that moves along the longitudinal slide rail (1-1); the transverse moving mechanism (2) includes a transverse slide rail (2-1) arranged along the roller axis and a transverse slider (2-2) that moves along the transverse slide rail (2-1), the transverse slide rail (2-1) is provided on the longitudinal slider (1-2), and the lifting mechanism (3) is provided on the transverse slider (2-2).

3. The roller periodic foreign matter cleaning mechanism according to claim 2, characterized in that: The servo motor (4) includes a first high-precision servo motor, a second high-precision servo motor and a third high-precision servo motor respectively connected to the vision inspection system. The first high-precision servo motor drives the vertical slider (1-2); the second high-precision servo motor drives the horizontal slider (2-2); and the third high-precision servo motor drives the lifting mechanism (3).

4. The roller periodic foreign matter cleaning mechanism according to claim 1, characterized in that: The wiping paper feeding and receiving mechanism (5-1) includes two rotating disks (5-101) and a receiving and receiving motor (5-102). The two rotating disks (5-101) are used for feeding and receiving paper respectively, and the receiving and receiving motor (5-102) controls the rotation and feeding and receiving of the wiping paper belt.

5. The roller periodic foreign matter cleaning mechanism according to claim 1, characterized in that: The wetting structure (5-2) further includes a first supply motor (5-202) that connects to the wetting liquid channel (5-201) and controls the delivery of the wetting liquid.

6. The roller periodic foreign matter cleaning mechanism according to claim 1, characterized in that: The polishing paste extrusion structure (5-3) further includes a second supply motor (5-303) that connects to the polishing paste flow channel (5-301) and controls the extrusion of the polishing paste.

7. The roller periodic foreign matter cleaning mechanism according to claim 1, characterized in that: The polishing paste extrusion structure (5-3) also includes a collection groove (5-304) that works with a scraper (5-302) to collect excess polishing paste.

8. The roller periodic foreign matter cleaning mechanism according to claim 1, characterized in that: The roller wiping and cleaning assembly (5) also includes an infrared sensor (5-5) for detecting the distance between the wiping head and the roller surface.

9. The roller periodic foreign matter cleaning mechanism according to claim 1, characterized in that: The roller wiping and cleaning assembly (5) also includes a pressure sensor (5-6) for detecting the wiping force of the roller surface.

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