Detection device for preventing glue leakage of cloth coating of coating machine in printing and dyeing mill

Abstract

The invention discloses a detection device for preventing glue leakage of a cloth coating of a coating machine in a printing and dyeing mill, belongs to the technical field of gluing, and solves the problems that the efficiency is low and the detection device is easily influenced by human factors. Comprising a main frame, a secondary frame and an auxiliary frame arranged on one side of the main frame and one side of the secondary frame, a main unwinding roller, a main winding roller and a main guide roller set which are rotatably arranged are detachably connected between the main frame and the auxiliary frame, and a secondary winding roller, a secondary unwinding roller and a secondary guide roller set which are rotatably arranged are detachably connected between the secondary frame and the auxiliary frame. A tensioning roller, a main upper roller and a main lower roller located below the main upper roller are rotationally arranged between the secondary frame and the auxiliary frame, and a secondary upper roller and a secondary lower roller located below the secondary upper roller are further rotationally arranged between the secondary frame and the auxiliary frame. According to the invention, the cloth is quickly unwound and wound on the coating machine, the friction belt generates heat on the cloth, the visual camera is used for detecting holes, and after the main control module analyzes, the part with the holes is skipped during gluing, so that glue leakage is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of glue coating, in particular to a detection device for preventing glue leakage from a cloth coating of a coating machine in a printing and dyeing factory. Background Art

[0002] Gluing fabric surface is a common finishing process, which is mainly used to enhance the durability, waterproofness and wear resistance of fabric. In this process, a specific adhesive is evenly applied to the surface of the fabric, and then the adhesive is cured by heat treatment or pressure to form a protective film. This treatment method is widely used in the production of outdoor clothing, tents, footwear and various industrial fabrics. The glued fabric not only improves the functionality, but also improves the feel and appearance. However, the glue coating process requires precise control of the quality of the adhesive and the uniformity of the coating to ensure that the breathability and comfort of the fabric are not greatly affected. In addition, the development of environmentally friendly adhesives is also a hot topic of current research to reduce the impact on the environment.

[0003] During the working process of the coating machine, due to various reasons (such as equipment failure, improper operation, material problems, etc.), holes may appear in the cloth, resulting in glue leakage. These defects not only affect the appearance of the cloth, but also cause problems such as poor flatness of the glue coating, glue coating quality problems, and glue layer dripping. Therefore, it is very important to screen the cloth for holes in the coating machine to prevent glue leakage, in order to detect and repair these problems in time to ensure product quality.

[0004] The current existing technology is to have trained operators or quality inspectors visually inspect the fabric to look for holes and signs of glue leakage. This method is simple and direct, but inefficient and susceptible to human factors.

[0005] Therefore, a detection device for preventing glue leakage from the cloth coating of a coating machine in a printing and dyeing factory is proposed to solve or alleviate the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a detection device for preventing glue leakage from the cloth coating of a coating machine in a printing and dyeing factory.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A detection device for preventing glue leakage from the coating of a cloth of a coating machine in a printing and dyeing factory comprises a main frame, a secondary frame, and an auxiliary frame arranged on one side of the main frame and the secondary frame, wherein a main unwinding roller, a main winding roller, and a main guide roller group that can be rotatably arranged are detachably connected between the main frame and the auxiliary frame, a secondary winding roller, a secondary unwinding roller, and a secondary guide roller group that can be rotatably arranged are detachably connected between the secondary frame and the auxiliary frame, a tensioning roller, a main upper roller, and a main lower roller located below the main upper roller are rotatably arranged between the secondary frame and the auxiliary frame, and the secondary frame A secondary upper roller and a secondary lower roller located below the secondary upper roller are rotatably arranged between the auxiliary frame, and the outer rings of the secondary upper roller, the secondary lower roller, the secondary guide roller group, the secondary unwinding roller, and the secondary winding roller are provided with an annular friction belt, and the friction belt is used to rub against the cloth to be processed. A strip spray head is fixedly connected between the secondary frame and the auxiliary frame, and the strip spray head is connected to a paint tank through a pipeline, and the paint tank is connected to a pump body, and a spacing groove is formed between the strip spray head and the tensioning roller for the cloth to be processed to pass through;

[0009] It also includes a visual camera, a counting circuit, and a main control module. The visual camera is used to collect the thermal map after the friction between the cloth and the friction belt generates heat and feed it back to the main control module. The counting circuit is used to collect the number of rotations of the main winding roller and feed it back to the main control module. The main control module memorizes the cloth in sections according to the thermal map and the number of rotations, retains the number of rotations at the hole after identifying the hole, and controls the spraying action of the pump body.

[0010] Preferably, it also includes a main first-level servo motor, a main second-level servo motor, a secondary-level servo motor, and a secondary-level servo motor, and the main first-level servo motor, the main second-level servo motor, the secondary-level servo motor, and the secondary-level servo motor are all coupled to the main control module, the main first-level servo motor is transmission connected to one end of the main unwinding roller through a coupling, the main second-level servo motor is transmission connected to one end of the main winding roller through a coupling, the secondary-level servo motor is transmission connected to one end of the secondary unwinding roller through a coupling, and the secondary-level servo motor is transmission connected to one end of the secondary winding roller through a coupling.

[0011] Preferably, the friction belt comprises a rubber belt, and a friction cloth layer detachably connected to the outer ring of the rubber belt, the outer ring of the friction cloth layer is integrally formed with fluff, the inner ring of the rubber belt is concave-convexly arranged to form concave portions and convex portions alternately arranged at intervals, the flexibility of the friction cloth layer and the fluff is greater than the flexibility of the cloth to be processed, and the thermal conductivity of the friction cloth layer and the fluff is less than the thermal conductivity of the cloth to be processed.

[0012] Preferably, the counting circuit includes a metal block fixedly connected to the end face of one end of the main winding roller, a Hall sensor arranged on the main frame, and a voltage comparator coupled to the output end of the Hall sensor, and the output end of the voltage comparator is coupled to the input end of the main control module.

[0013] Preferably, the main control module is a controller.

[0014] Preferably, the visual camera is used to collect the thermal map after the friction between the cloth and the friction belt generates heat and feed it back to the main control module, including the following steps:

[0015] The visual camera takes pictures of the cloth to form several heat maps;

[0016] Pre-processing: the length of the thermal image taken by the visual camera each time is constant to the width of the cloth, and the width of the thermal image taken by the visual camera each time is equal to the outer diameter of the outer ring of the main winding roller;

[0017] The width of the heat map captured by the visual camera each time is in,

[0018] D0 is the outer diameter of the main winding roller, d is the thickness of the cloth, N is the number of rotations, ∈0 is the initial compression rate of the cloth, and Δ∈ is the compression rate increased with each rotation of the main winding roller.

[0019] Preferably, the main control module memorizes the cloth in sections according to the thermal map and the number of rotations, retains the number of rotations at the hole after identifying the hole, and controls the spraying action, including the following steps:

[0020] Correlate the heat map with the number of rotations to form I input (1, N)

[0021] Gaussian blur is used to remove noise from the heat map. blur =G σ (I input ), where G σ It is a Gaussian blur operation;

[0022] Normalize the heat map. Among them, I max and I min are the maximum and minimum values ​​of the heat map before normalization;

[0023] The normalized heat map is binarized using the adaptive threshold method, and the areas above the threshold are marked as potential holes. Where N(x, y) is the neighborhood centered at (x, y), and k is a constant;

[0024] Filter out the heatmap numbers marked as potential holes and delete the heatmap.

[0025] Preferably, the main control module memorizes the cloth in sections according to the thermal map and the number of rotations, retains the number of rotations at the hole after identifying the hole, and controls the spraying action, and also includes the following steps:

[0026] Apply edge detection algorithms to identify the edges of holes.

[0027]

[0028] The area A of each detected hole area is calculated by formula 1, the perimeter P is calculated by formula 2, and the roundness C is calculated by formula 3;

[0029] The hole is judged as through or non-through based on the calculated area A, perimeter P, and roundness C. If the area is greater than the set threshold and the roundness is less than the set threshold, it is identified as a through hole. If the area is less than the set threshold or the roundness is greater than the set threshold, it is identified as a non-through hole.

[0030] Preferably, the formula 1 includes A=∑ (x，y)∈R E(x, y), where R is the pixel area of ​​the hole, and the formula 2 includes in, is the edge pixel set of the hole, and the formula 3 includes

[0031] The present invention has the following beneficial effects:

[0032] The present invention can, before coating, first allow the cloth to be processed to complete a rapid unwinding and winding action on the coating machine, and in this process, the friction belt is in contact and friction with the cloth to be processed, thereby causing the surface area of ​​the cloth to be processed to store heat, and transmits the thermal map to the main control module through a visual camera, and the main control module determines which parts of the cloth have holes. When subsequently spraying paint, these parts with holes can skip the spraying action to avoid glue leakage of the cloth coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is a structural schematic diagram of the present invention;

[0035] Figure 2 This is a schematic diagram of the structure of the present invention after removing the auxiliary frame;

[0036] Figure 3 It is a schematic diagram of the local structure of the friction belt in the present invention;

[0037] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0038] 1. Main frame; 2. Secondary frame; 3. Auxiliary frame; 4. Main unwinding roller; 5. Main winding roller; 6. Main guide roller group; 7. Secondary winding roller; 8. Secondary unwinding roller; 9. Secondary guide roller group; 10. Tensioning roller; 11. Strip nozzle; 12. Main upper roller; 13. Main lower roller; 14. Secondary upper roller; 15. Secondary lower roller; 16. Friction belt; 17. Rubber belt; 18. Protrusion; 19. Concave part; 20. Friction cloth layer; 21. Fluff. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0040] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0042] In the description of the present invention, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the product of the invention is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0043] Furthermore, the terms “first”, “second”, “third”, etc. are merely used for distinguishing descriptions and are not to be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] A detection device for preventing glue leakage from the coating of cloth in a coating machine of a printing and dyeing factory, such as Figure 1 and Figure 2 As shown, it includes a main frame 1, a secondary frame 2, and an auxiliary frame 3 arranged on one side of the main frame 1 and the secondary frame 2. A main unwinding roller 4, a main winding roller 5, and a main guide roller group 6 that can be rotatably arranged are detachably connected between the main frame 1 and the auxiliary frame 3. A secondary winding roller 7, a secondary unwinding roller 8, and a secondary guide roller group 9 that can be rotatably arranged are detachably connected between the secondary frame 2 and the auxiliary frame 3. A tensioning roller 10, a main upper roller 12, and a main lower roller 13 located below the main upper roller 12 are rotatably arranged between the secondary frame 2 and the auxiliary frame 3. A secondary upper roller 14 and a secondary lower roller 15 located below the secondary upper roller 14 and the secondary lower roller 15 are rotatably provided. The outer rings of the secondary upper roller 14, the secondary lower roller 15, the secondary guide roller group 9, the secondary unwinding roller 8, and the secondary winding roller 7 are provided with an annular friction belt 16, and the friction belt 16 is used for rubbing with the cloth to be processed. A strip spray head 11 is fixedly connected between the secondary frame 2 and the auxiliary frame 3. The strip spray head 11 is connected to a paint tank through a pipeline, and the paint tank is connected to a pump body. A spacing groove is formed between the strip spray head 11 and the tensioning roller 10 for the cloth to be processed to pass through.

[0046] It also includes a visual camera, a counting circuit, and a main control module. The visual camera is used to collect the thermal map after the cloth and the friction belt 16 generate heat through friction and feed it back to the main control module. The counting circuit is used to collect the number of rotations of the main winding roller 5 and feed it back to the main control module. The main control module memorizes the cloth in sections according to the thermal map and the number of rotations, retains the number of rotations at the hole after identifying the hole, and controls the spraying action of the pump body.

[0047] Before coating, the present invention firstly makes the cloth to be processed unwind and rewind quickly on the coating machine. During this process, the friction belt 16 contacts the cloth and generates friction, so that the cloth surface absorbs heat. The counting circuit counts the number of rotations of the main rewinding roller 5 and transmits it to the main control module. Then, the thermal map is obtained through the visual camera and transmitted to the main control module. The main control module is responsible for analyzing the thermal map of the cloth to identify which parts have holes.

[0048] The method of generating heat through friction and then assisting in hole identification is different from directly heating the cloth. Since the cloth rotates at a high speed during unwinding and winding, a high heat exchange rate cannot be achieved between the two when the cloth is heated by an external object. Therefore, the cloth will recover to its original temperature in a short time. Similarly, due to the high speed of the cloth, timely feedback cannot be obtained through wind selection. For the simple image capture and image recognition, when the color of the cloth is darker, if the image capture environment does not have a brighter lighting environment, it will not be conducive to the final recognition and will affect the accuracy of hole finding.

[0049] Subsequently, when spraying the paint, the main control module can automatically skip these areas with holes by controlling the operation of the pump body, thereby effectively avoiding the problem of coating leakage. This process not only improves the coating efficiency, but also ensures the coating quality of the cloth, reduces material waste, and improves the overall efficiency of production. Through this method, the cloth is processed more accurately, ensuring the performance and appearance of the final product, and meeting the market demand for high-quality cloth.

[0050] Preferably, it also includes a main first-level servo motor, a main second-level servo motor, a secondary-level servo motor, and a secondary-level servo motor. The main first-level servo motor, the main second-level servo motor, the secondary-level servo motor, and the secondary-level servo motor are all coupled to the main control module. The main first-level servo motor is transmission connected to one end of the main unwinding roller 4 through a coupling, the main second-level servo motor is transmission connected to one end of the main winding roller 5 through a coupling, the secondary-level servo motor is transmission connected to one end of the secondary unwinding roller 8 through a coupling, and the secondary-level servo motor is transmission connected to one end of the secondary winding roller 7 through a coupling.

[0051] When the main unwinding roller 4, the main winding roller 5, the secondary unwinding roller 8, and the secondary winding roller 7 need to work, they can be driven by the main first-level servo motor, the main second-level servo motor, the secondary-level servo motor, and the secondary-level servo motor using a coupling, and the main first-level servo motor, the main second-level servo motor, the secondary-level servo motor, and the secondary-level servo motor do not need to work at the same time, and when the main unwinding roller 4, the main winding roller 5, the secondary unwinding roller 8, and the secondary winding roller 7 need to be disassembled, they can also be disassembled from the coupling and then the cloth can be unloaded.

[0052] Preferably, if Figure 3 and Figure 4As shown, the friction belt 16 includes a rubber belt 17, and a friction cloth layer 20 detachably connected to the outer ring of the rubber belt 17, the outer ring of the friction cloth layer 20 is integrally formed with fluff 21, the inner ring of the rubber belt 17 is concave-convex to form concave portions 19 and convex portions 18 alternately arranged, the flexibility of the friction cloth layer 20 and the fluff 21 is greater than the flexibility of the cloth to be processed, and the thermal conductivity of the friction cloth layer 20 and the fluff 21 is less than the thermal conductivity of the cloth to be processed.

[0053] The rubber belt 17 and the arrangement of the concave portions 19 and convex portions 18 therein not only increase the friction when in contact with the roller, but also have a certain heat insulation effect, thereby preventing the friction cloth layer 20 from excessively contacting the air and dissipating heat during the rapid rotation of the friction belt 16. The arrangement of the friction cloth layer 20 and the fluff 21 maximizes the friction between the cloth to be processed and generates more heat while ensuring its flexibility, thereby not easily causing damage to the cloth.

[0054] Preferably, the counting circuit includes a metal block fixedly connected to the end face of one end of the main winding roller 5, a Hall sensor arranged on the main frame 1, and a voltage comparator coupled to the output end of the Hall sensor, the output end of the voltage comparator is coupled to the input end of the main control module, and the main control module is a controller.

[0055] When the main winding roller 5 rotates, it can drive the metal block to rotate together. During the rotation process, the metal block approaches the Hall sensor, which will cause the Hall sensor to output a Hall signal to the voltage comparator. After the voltage comparator determines that the Hall signal is greater than the preset reference signal, it will feedback a comparison signal to the main control module, thereby completing a more accurate statistics of the number of rotations.

[0056] Preferably, the visual camera is used to collect the thermal diagram after the friction between the cloth and the friction belt 16 generates heat and feed it back to the main control module, including the following steps:

[0057] The visual camera takes pictures of the cloth to form several heat maps;

[0058] Pre-processing: the length of the thermal image taken by the visual camera each time is constant to the width of the cloth, and the width of the thermal image taken by the visual camera each time is equal to the outer diameter of the outer ring of the main winding roller 5;

[0059] The width of the heat map captured by the visual camera each time is in,

[0060] D0 is the outer diameter of the main winding roller, d is the thickness of the cloth, N is the number of rotations, ∈0 is the initial compression rate of the cloth, and Δ∈ is the compression rate increased with each rotation of the main winding roller.

[0061] Preferably, the main control module memorizes the cloth in sections according to the thermal map and the number of rotations, retains the number of rotations at the hole after identifying the hole, and controls the spraying action, including the following steps:

[0062] Correlate the heat map with the number of rotations to form I input (1, N);

[0063] Gaussian blur is used to remove noise from the heat map. blur =G σ (I input ) Among them, G σ It is a Gaussian blur operation;

[0064] Normalize the heat map. Among them, I max and I min are the maximum and minimum values ​​of the heat map before normalization;

[0065] The normalized heat map is binarized using the adaptive threshold method, and the areas above the threshold are marked as potential holes. Where N(x, y) is the neighborhood centered at (x, y), and k is a constant;

[0066] Filter out the heatmap numbers marked as potential holes and delete the heatmap.

[0067] Preferably, the main control module memorizes the cloth in sections according to the thermal map and the number of rotations, retains the number of rotations at the hole after identifying the hole, and controls the spraying action, and also includes the following steps:

[0068] Apply edge detection algorithms to identify the edges of holes.

[0069]

[0070] The area A of each detected hole area is calculated by formula 1, the perimeter P is calculated by formula 2, and the roundness C is calculated by formula 3. Formula 1 includes A=∑ (x，y)∈R E(x, y), where R is the pixel area of ​​the hole, and the formula 2 includes in, is the edge pixel set of the hole, and the formula 3 includes

[0071] The hole is judged as through or non-through based on the calculated area A, perimeter P, and roundness C. If the area is greater than the set threshold and the roundness is less than the set threshold, it is identified as a through hole. If the area is less than the set threshold or the roundness is greater than the set threshold, it is identified as a non-through hole.

[0072] Through the above method, not only can the positions of the holes on the cloth be determined more accurately, but it can also be analyzed which holes are through and which holes are not through, providing a reference for processing personnel.

[0073] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A detection device for preventing glue leakage from the coating of cloth in a coating machine of a printing and dyeing factory, characterized in that: The invention comprises a main frame (1), a secondary frame (2), and an auxiliary frame (3) arranged on one side of the main frame (1) and the secondary frame (2); a main unwinding roller (4), a main winding roller (5), and a main guide roller group (6) are detachably connected between the main frame (1) and the auxiliary frame (3); a secondary winding roller (7), a secondary unwinding roller (8), and a secondary guide roller group (9) are detachably connected between the secondary frame (2) and the auxiliary frame (3); a tensioning roller (10), a main upper roller (12), and a main lower roller (13) located below the main upper roller (12) are rotatably arranged between the secondary frame (2) and the auxiliary frame (3); ) are also rotatably provided with a secondary upper roller (14) and a secondary lower roller (15) located below the secondary upper roller (14), the secondary lower roller (15), the secondary guide roller group (9), the secondary unwinding roller (8), and the secondary winding roller (7), the outer ring sleeves of which are provided with an annular friction belt (16), the friction belt (16) is used for rubbing with the cloth to be processed, a strip spray head (11) is fixedly connected between the secondary frame (2) and the auxiliary frame (3), the strip spray head (11) is connected to a paint tank through a pipeline, the paint tank is connected to a pump body, and a spacing groove is formed between the strip spray head (11) and the tensioning roller (10) for the cloth to be processed to pass through; It also includes a visual camera, a counting circuit, and a main control module. The visual camera is used to collect a thermal map after the friction between the cloth and the friction belt (16) generates heat and feeds it back to the main control module. The counting circuit is used to collect the number of rotations of the main winding roller (5) and feed it back to the main control module. The main control module memorizes the cloth in sections according to the thermal map and the number of rotations, retains the number of rotations at the hole after identifying the hole, and controls the spraying action of the pump body.

2. A detection device for preventing glue leakage from the coating of a coating machine in a printing and dyeing factory according to claim 1, characterized in that: It also includes a main first-level servo motor, a main second-level servo motor, a secondary first-level servo motor, and a secondary second-level servo motor, wherein the main first-level servo motor, the main second-level servo motor, the secondary first-level servo motor, and the secondary second-level servo motor are all coupled to the main control module, the main first-level servo motor is connected to one end of the main unwinding roller (4) through a coupling, the main second-level servo motor is connected to one end of the main winding roller (5) through a coupling, the secondary first-level servo motor is connected to one end of the secondary unwinding roller (8) through a coupling, and the secondary second-level servo motor is connected to one end of the secondary winding roller (7) through a coupling.

3. The detection device for preventing glue leakage from the coating of a coating machine in a printing and dyeing factory according to claim 1 is characterized in that: The friction belt (16) comprises a rubber belt (17) and a friction cloth layer (20) detachably connected to the outer ring of the rubber belt (17); the outer ring of the friction cloth layer (20) is integrally formed with fluff (21); the inner ring of the rubber belt (17) is concave-convexly arranged to form concave parts (19) and convex parts (18) arranged alternately at intervals; the flexibility of the friction cloth layer (20) and the fluff (21) is greater than the flexibility of the cloth to be processed; and the thermal conductivity of the friction cloth layer (20) and the fluff (21) is less than the thermal conductivity of the cloth to be processed.

4. The detection device for preventing glue leakage from the coating of a coating machine in a printing and dyeing factory according to claim 1 is characterized in that: The counting circuit comprises a metal block fixedly connected to an end surface of a main winding roller (5), a Hall sensor arranged on a main frame (1), and a voltage comparator coupled to an output end of the Hall sensor, wherein the output end of the voltage comparator is coupled to an input end of a main control module.

5. The detection device for preventing glue leakage from the coating of a coating machine in a printing and dyeing factory according to claim 1 is characterized in that: The main control module is a controller.

6. The detection device for preventing glue leakage from the coating of a coating machine in a printing and dyeing factory according to claim 1 is characterized in that: The visual camera is used to collect a thermal image after the friction between the cloth and the friction belt (16) generates heat and feeds it back to the main control module, comprising the following steps: The visual camera takes pictures of the cloth to form several heat maps; Pre-processing: the length of the thermal image captured by the visual camera each time is constant to the width of the cloth, and the width of the thermal image captured by the visual camera each time is equal to the outer diameter of the outer ring of the main winding roller (5); The width of the heat map captured by the visual camera each time is in, D0 is the outer diameter of the main winding roller, d is the thickness of the cloth, N is the number of rotations, ∈0 is the initial compression rate of the cloth, and Δ∈ is the compression rate increased with each rotation of the main winding roller.

7. A detection device for preventing glue leakage from the coating of a coating machine in a printing and dyeing factory according to claim 6, characterized in that: The main control module memorizes the cloth in sections according to the thermal map and the number of rotations, retains the number of rotations at the hole after identifying the hole, and controls the spraying action, including the following steps: Correlate the heat map with the number of rotations to form I input (1, N); Gaussian blur is used to remove noise from the heat map. blur =G σ (I input ), where G σ It is a Gaussian blur operation; Normalize the heat map. Among them, I max and I min are the maximum and minimum values ​​of the heat map before normalization; The normalized heat map is binarized using the adaptive threshold method, and the areas above the threshold are marked as potential holes. Where N(x, y) is the neighborhood centered at (x, y), and k is a constant; Filter out the heatmap numbers marked as potential holes and delete the heatmap.

8. The detection device for preventing glue leakage from the coating of a coating machine in a printing and dyeing factory according to claim 7 is characterized in that: The main control module memorizes the cloth in sections according to the thermal map and the number of rotations, retains the number of rotations at the hole after identifying the hole, and controls the spraying action, and also includes the following steps: Apply edge detection algorithms to identify the edges of holes. The area A of each detected hole area is calculated by formula 1, the perimeter P is calculated by formula 2, and the roundness C is calculated by formula 3; The hole is judged as through or non-through based on the calculated area A, perimeter P, and roundness C. If the area is greater than the set threshold and the roundness is less than the set threshold, it is identified as a through hole. If the area is less than the set threshold or the roundness is greater than the set threshold, it is identified as a non-through hole.

9. A detection device for preventing glue leakage from the coating of a coating machine in a printing and dyeing factory according to claim 8, characterized in that: The formula 1 includes A=∑ (x，y)∈R E(x, y), where R is the pixel area of ​​the hole, and the formula 2 includes in, is the edge pixel set of the hole, and the formula 3 includes

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