Defect Detection Device for the Processing of New Materials of Thermal Sensitive Films Based on Machine Vision

Abstract

The present invention discloses a defect detection device for processing new materials of thermal-sensitive films based on machine vision, which relates to the technical field of thermal-sensitive film defect detection. The device includes a detection chassis, inside which a thermal-sensitive film is arranged. On one side of the upper end of the detection chassis, there is a heat treatment mechanism for baking the thermal-sensitive film, and inside the detection chassis, there is a vision detection mechanism for cleaning the surface of the thermal-sensitive film and performing a cooling treatment. The cooperation use of the anti-static winding film with the extrusion cylinder, the roller and the extension cylinder in the present invention can gently and effectively extrude the thermal-sensitive film, thereby significantly improving the flatness of its surface. The anti-static winding film made of a flexible material will not cause hard damage or deformation when contacting the thermal-sensitive film. The anti-static winding film is made of a material for eliminating static electricity, which can continuously neutralize the static charges on the surface of the thermal-sensitive film during the conveying process, avoid adsorbing dust or other particulate matters due to static electricity, and keep the surface clean.

Description

Technical Field

[0001] The invention relates to the technical field of thermal film defect detection, and in particular to a defect detection device for thermal film new material processing based on machine vision. Background Art

[0002] For example, the patent document with publication number CN215768297U is named as a defect detection device for processing new materials of thermal films based on machine vision, which includes: a base, a two-way detection platform is fixedly installed on one side of the top of the base, the two-way detection platform is used to detect defects on thermal films, a fixed detection mechanism is arranged on one side inside the two-way detection platform, which is used to detect visual defects on the lower surface of the thermal film, a lifting mobile detection mechanism is arranged directly above the fixed detection mechanism, the mobile detection mechanism is used to detect visual defects on the upper surface of the thermal film, and a lifting mechanism is arranged on one side of the mobile detection mechanism for cyclically controlling the lifting of the mobile detection mechanism; a mobile detection frame is movably arranged on the two-way detection platform, the mobile detection frame is used to transport thermal films for mobile detection, and a toggle mechanism is arranged on the side of the mobile detection mechanism away from the lifting mechanism. The advantages of this utility model are: automated mobile detection, double-sided synchronous detection, fast speed and high efficiency.

[0003] During the production process of thermal film, the coating needs to be baked and cured after application, and then sent to the machine vision inspection equipment for quality inspection. However, during the transportation and inspection process, the thermal film may slip or get stuck, resulting in wrinkles, bubbles or deformation on the surface, affecting the coating uniformity and inspection accuracy. In addition, static electricity on the surface of the thermal film will absorb dust and other particles, reducing the imaging quality and inspection accuracy. At the same time, insufficient or uneven lighting will also affect the image quality, thereby reducing the accuracy and reliability of defect identification. Therefore, the present application provides a defect detection device for new thermal film material processing based on machine vision to meet the needs. Summary of the invention

[0004] The purpose of this application is to provide a defect detection device for processing new thermal film materials based on machine vision, which can effectively solve the problems raised in the above background technology.

[0005] To achieve the above object, the present application provides the following technical solutions: A defect detection device for processing new materials of thermal sensitive films based on machine vision, including a detection chassis. Inside the detection chassis, there is a thermal sensitive film. On one side of the upper end of the detection chassis, there is a heat treatment mechanism for baking the thermal sensitive film. Inside the detection chassis, there is a vision detection mechanism for cleaning the surface of the thermal sensitive film and performing a cooling treatment. Below the vision detection mechanism inside the detection chassis, there is a supplementary lighting mechanism for providing two detection environments for the vision detection mechanism. On one side of the heat treatment mechanism inside the detection chassis, there is an electrostatic elimination mechanism for eliminating the static electricity on the surface of the thermal sensitive film and performing stretching. On one side of the detection chassis, there is a purification air box;

[0006] The electrostatic elimination mechanism includes a winding drum, a roller, and an extension cylinder. The roller and the extension cylinder are both rotatably installed inside the detection chassis, and an anti-static winding film for extruding the thermal sensitive film and eliminating the surface static electricity is wound around the outer surfaces of the roller, the extension cylinder, and the winding drum.

[0007] Among them, the electrostatic elimination mechanism includes an extrusion cylinder and two drive gear boxes, and the winding drum is rotatably installed inside the two drive gear boxes. The extrusion cylinder is rotatably installed inside the detection chassis, and the thermal sensitive film is wound around the outer surface of the extrusion cylinder.

[0008] Among them, on one side of the inner wall of the detection chassis, there are two push rods, and a push cylinder is rotatably installed at the common end of the two push rods.

[0009] Among them, the supplementary lighting mechanism includes a center line rod rotatably installed inside the detection chassis. An installation disc is arranged on the outside of the center line rod. A light transmission cylinder is arranged on the outer surface of the installation disc. The thermal sensitive film is wound around the outer surface of the light transmission cylinder. A second bearing ring and a first bearing ring are arranged on the inner wall of the light transmission cylinder. An installation frame is jointly arranged on the inner walls of the first bearing ring and the second bearing ring.

[0010] Among them, a center partition board is arranged in the middle of the inner wall of the installation frame. Slide block grooves are arranged at one ends of the center partition board and the installation frame. A brush board for cleaning the inner wall of the light transmission cylinder is arranged inside the slide block grooves. An adapter ring plate is arranged at one end of the installation frame, and one end of the adapter ring plate is connected to the inner wall of the detection chassis.

[0011] Among them, the inside of the installation frame is divided into a light chamber and a dark chamber by the center partition board. Reflective arc pieces are arranged on the inner wall of the light chamber, and a lighting lamp is arranged inside the reflective arc pieces. The reflective arc pieces are in the shape of a semi-circular tube, and a reflective coating is arranged on the inner wall of the reflective arc pieces.

[0012] Among them, a bottom light board is arranged on the inner wall of the dark chamber. The bottom light board is attached to the inner wall of the light transmission cylinder, and a controlled light lamp is arranged inside the bottom light board.

[0013] Among them, the visual detection mechanism includes an installation box, which is installed on the upper inner wall of the detection machine box through a telescopic rod. A ventilation pipe is arranged at the upper end of the installation box, and one end of the ventilation pipe communicates with the inside of the purification air box. Side plates are arranged on both sides of the lower end of the installation box, and roller rods are rotatably installed at the lower ends of the two side plates. A guiding plate for guiding the air flow direction is arranged inside the installation box.

[0014] Among them, a partition plate is arranged on the inner wall of the installation box. The partition plate is located in the middle of the guiding plate, and a second detection camera and a camera holder are respectively arranged on both sides of the partition plate. A first detection camera is arranged inside the camera holder. A pressure roller is arranged at the lower end of the partition plate.

[0015] Among them, a condenser ring is arranged at the lower end of the second detection camera, and a lamp ring is arranged inside the condenser ring.

[0016] In summary, the technical effects and advantages of the present invention are as follows:

[0017] 1. The cooperation of the anti-static winding film, the extrusion cylinder, the roller cylinder and the extension cylinder set in the present invention can gently and effectively extrude the thermal film, thereby significantly improving the flatness of its surface. The anti-static winding film made of flexible material will not cause hard damage or deformation when contacting the thermal film. The anti-static winding film is made of material that eliminates static electricity, and can continuously neutralize the static charges on the surface of the thermal film during the conveying process, avoiding the adsorption of dust or other particulate matters due to static electricity, and keeping the surface clean. A clean and dust-free surface helps machine vision and other detection means to obtain more accurate results, reducing misjudgment caused by surface contamination. The driving gearbox drives the winding drum to rotate, and then drives the anti-static winding film to drive, making the overall movement more coordinated and consistent, ensuring the stable forward conveying of the thermal film, reducing the risk of slippage or jamming of the thermal film during the conveying process. The contact mode between the flexible anti-static winding film and the surface of the thermal film is relatively gentle and will not damage the coating on it. Especially after heat curing treatment, the integrity and optical properties of the coating are further protected.

[0018] 2. The cold air blown out by the purification air box through the ventilation pipe and the guiding plate in the present invention can effectively remove the dust and other particulate matters on the surface of the thermal film, ensuring that the surface is clean and free of impurities. At the same time, the cold air cools the heated thermal film, making it quickly return to a suitable working temperature, preventing high temperature from affecting the detection accuracy or material properties. The cooled thermal film will shrink slightly, making the surface defects (such as scratches, bubbles, etc.) more likely to appear under the tension state, improving the sensitivity and accuracy of detection. Quick cooling helps to lock the state of the cured coating.

[0019] 3. The combination of the lighting lamp and the reflective arc plate in the present invention ensures that light can evenly pass through the light-transmitting cylinder and irradiate the lower surface of the thermal film, providing a bright and consistent background light source. The lamp ring cooperates with the light-gathering ring to concentrate the light on the upper surface of the thermal film, enhancing the local light intensity while maintaining the uniformity of illumination. The synchronous illumination of the upper and lower surfaces enables any minor defects (such as scratches, bubbles, stains, etc.) on the surface of the thermal film to be clearly visible against a high-contrast background, improving the recognition ability of the second detection camera. Through the carefully designed optical path, unnecessary shadows and reflections are reduced, ensuring the clarity and accuracy of the image. Sufficient lighting conditions enable the second detection camera to capture high-quality images in a short time. The high-brightness and high-contrast lighting contribute to the identification of very subtle defects, ensuring the comprehensiveness and reliability of the detection.

[0020] 4. The middle partition in the present invention blocks the light refracted by the light-gathering ring and the reflective arc plate, ensuring that the space where the first detection camera is located has independent lighting conditions, avoiding the influence of other light sources on the detection results. By specifically setting the bottom light plate as a backlight plate, the lighting intensity and distribution can be precisely controlled to provide a stable background light source, thereby improving the accuracy and consistency of the detection. The uniform light source emitted by the bottom light plate irradiates from the back of the thermal film, making the coating thickness and uniformity clearly visible under high contrast. Any uneven areas will be clearly shown in the image for easy identification. Utilizing the penetrability of light, the first detection camera can more effectively detect the uniformity of the coating on the surface of the thermal film. Especially for transparent or semi-transparent coatings, minor thickness differences and defects can be detected. Under backlight conditions, bubbles, cracks or other subtle defects in the coating will be more obvious, helping to improve the sensitivity of the detection. Sufficient backlight conditions enable the first detection camera to capture high-quality images in a short time, accelerating the detection speed without sacrificing accuracy. Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 It is a three-dimensional structural schematic diagram of a defect detection device for the processing of new materials of thermal films based on machine vision;

[0023] Figure 2 It is a three-dimensional structural sectional view of a defect detection device for the processing of new materials of thermal films based on machine vision;

[0024] Figure 3Schematic diagram of the local three-dimensional connection structure of the defect detection device for the processing of new materials of thermal-sensitive films based on machine vision;

[0025] Figure 4 Schematic diagram of the first perspective three-dimensional connection structure of the static electricity elimination mechanism, the vision detection mechanism and the supplementary lighting mechanism;

[0026] Figure 5 Schematic diagram of the second perspective three-dimensional connection structure of the static electricity elimination mechanism, the vision detection mechanism and the supplementary lighting mechanism;

[0027] Figure 6 Schematic diagram of the first perspective three-dimensional connection structure of the static electricity elimination mechanism;

[0028] Figure 7 Schematic diagram of the second perspective three-dimensional connection structure of the static electricity elimination mechanism;

[0029] Figure 8 Schematic diagram of the third perspective three-dimensional connection structure of the static electricity elimination mechanism;

[0030] Figure 9 Schematic diagram of the three-dimensional connection structure of the vision detection mechanism and the supplementary lighting mechanism;

[0031] Figure 10 Cross-sectional view of the three-dimensional connection structure of the supplementary lighting mechanism;

[0032] Figure 11 Schematic diagram of the local three-dimensional connection structure of the supplementary lighting mechanism;

[0033] Figure 12 Schematic diagram of the first perspective three-dimensional connection structure of the reflective arc plate and the bottom light plate;

[0034] Figure 13 Schematic diagram of the second perspective three-dimensional connection structure of the reflective arc plate and the bottom light plate;

[0035] Figure 14 Schematic diagram of the first perspective three-dimensional connection structure of the vision detection mechanism;

[0036] Figure 15 Cross-sectional view of the three-dimensional connection structure of the vision detection mechanism;

[0037] Figure 16 Plan view of the second perspective three-dimensional connection structure of the vision detection mechanism;

[0038] Figure 17 Schematic diagram of the third perspective three-dimensional connection structure of the vision detection mechanism;

[0039] Figure 18 Schematic diagram of the fourth perspective three-dimensional connection structure of the vision detection mechanism.

[0040] In the figure: 1. Detection chassis; 2. Purification air box; 3. Heat treatment mechanism; 4. Electrostatic elimination mechanism; 41. Anti-electricity winding film; 42. Driving gear box; 43. Winding drum; 44. Roller; 45. Extrusion cylinder; 46. Extension cylinder; 5. Visual detection mechanism; 51. Installation box; 52. Ventilation pipe; 53. Side plate; 54. Roller rod; 55. Guide plate; 56. Spacer plate; 57. First detection camera; 58. Second detection camera; 59. Condensing ring; 511. Pressing roller; 512. Camera frame; 513. Lamp ring; 6. Supplementary lighting mechanism; 61. Translucent cylinder; 62. Connecting ring plate; 63. First bearing ring; 64. Installation disc; 65. Central line rod; 66. Second bearing ring; 67. Installation frame; 68. Brush plate; 69. Reflective arc piece; 611. Lighting lamp; 612. Bottom light plate; 613. Central partition plate; 614. Slide block; 7. Thermal film; 8. Push rod; 9. Push cylinder. Detailed implementation mode

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0042] Embodiment 1. Refer to Figures 1 to 18 The defect detection device for processing new materials of thermal film based on machine vision shown in the figure includes a detection chassis 1. A thermal film 7 is arranged inside the detection chassis 1. A heat treatment mechanism 3 for baking the thermal film 7 is arranged on one side of the upper end of the detection chassis 1. A visual detection mechanism 5 for cleaning the surface of the thermal film 7 and performing a cooling treatment is arranged inside the detection chassis 1. A supplementary lighting mechanism 6 for providing two detection environments for the visual detection mechanism 5 is arranged below the visual detection mechanism 5 inside the detection chassis 1. An electrostatic elimination mechanism 4 for eliminating the static electricity on the surface of the thermal film 7 and performing stretching is arranged on one side of the heat treatment mechanism 3 inside the detection chassis 1. A purification air box 2 is arranged on one side of the detection chassis 1;

[0043] Two push rods 8 are arranged on one side of the inner wall of the detection chassis 1. One end of the two push rods 8 is jointly rotatably installed with a push cylinder 9.

[0044] It is worth noting that when detecting the thermal film 7, the thermal film 7 passes through the heat treatment mechanism 3 and the electrostatic elimination mechanism 4, then passes between the visual detection mechanism 5 and the supplementary lighting mechanism 6, and finally is wound onto the winding drum through the extrusion of the push cylinder 9. The provided push rod 8 is used to adjust the position of the push cylinder 9 to control the extrusion force on the thermal film 7;

[0045] The surface of the thermal-sensitive film 7 is coated with a material and then conveyed into the interior of the heat treatment mechanism 3. After the thermal-sensitive film 7 undergoes curing treatment in the heat treatment mechanism 3, it is sent into the interior of the static electricity elimination mechanism 4. The static electricity elimination mechanism 4 set then tensions the heated thermal-sensitive film 7, so that after the thermal-sensitive film 7 is tensioned, it can be kept in a flat state, avoiding the coating distortion caused by relaxation or wrinkles, which will lead to surface irregularities and thus interfere with the imaging quality and defect recognition. Moreover, when the thermal-sensitive film 7 is in an appropriate tension state, its thickness distribution is more uniform. And when the static electricity elimination mechanism 4 winds and squeezes the thermal-sensitive film 7, it can also perform static electricity elimination treatment on its surface;

[0046] Among them, the thermal-sensitive film 7 undergoes curing treatment in the heat treatment mechanism 3, ensuring that the surface material coating can be fully cured. The static electricity elimination mechanism 4 not only eliminates the static charges on the surface of the thermal-sensitive film 7, but also keeps the film in a flat state through appropriate tension treatment, avoiding misdetection problems caused by static electricity adsorbing dust or other particulate matters.

[0047] The tension treatment of the static electricity elimination mechanism 4 keeps the thermal-sensitive film 7 in a flat state when it enters the visual inspection stage, reducing image distortion and distortion caused by relaxation or wrinkles, thereby improving the accuracy of defect recognition. Moreover, after the tension treatment, the thickness distribution of the thermal-sensitive film 7 is more uniform. The flat and undistorted surface of the thermal-sensitive film 7 is conducive to the visual inspection mechanism 5 capturing high-resolution and distortion-free images, improving the machine vision inspection performance.

[0048] Appropriate tension can prevent the film from jittering or slipping during the conveying process, reducing the risk of motion blur and ensuring that the visual inspection mechanism 5 can obtain clear images every time it takes a picture. Moreover, the static electricity elimination mechanism 4 helps to stabilize the position of the thermal-sensitive film 7 on the conveyor belt, making it move along the predetermined path and avoiding deviation or jamming phenomena. Appropriate tension can reduce the friction force between the thermal-sensitive film 7 and the conveyor belt or other contact surfaces to a certain extent. By adjusting the position of the push rod 8 to control the position of the push cylinder 9, the extrusion force on the thermal-sensitive film 7 can be precisely controlled, ensuring that the film will not be damaged due to excessive extrusion during the winding process, and at the same time avoiding the problem of loose winding caused by insufficient extrusion force.

[0049] When the thermal-sensitive film 7 passes between the supplementary lighting mechanism 6 and the visual inspection mechanism 5, the supplementary lighting mechanism 6 performs supplementary lighting treatment on the inspected thermal-sensitive film 7. The visual inspection mechanism 5 set can respectively detect the coating thickness of the thermal-sensitive film 7 and the surface of the thermal-sensitive film 7, and the visual inspection mechanism 5 set can also perform cooling treatment on the thermal-sensitive film 7, enabling the heated thermal-sensitive film 7 to cool quickly.

[0050] Among them, the uniform and sufficient illumination provided by the supplementary lighting mechanism 6 ensures that there is sufficient brightness contrast on the surface of the thermosensitive film 7 during visual inspection. Appropriate supplementary lighting can reduce shadow and reflection problems caused by insufficient or uneven light sources, ensuring more accurate detection results.

[0051] The visual inspection mechanism 5 can accurately measure the coating thickness of the thermosensitive film 7. By monitoring the coating thickness in real time, any situation beyond the tolerance range can be immediately identified during the production process. The visual inspection mechanism 5 can also comprehensively inspect the surface of the thermosensitive film 7, identify and record various types of defects, such as scratches, bubbles, stains, etc., to ensure that the final product is flawless.

[0052] Embodiment 2: Based on the electrostatic elimination mechanism 4 proposed in Embodiment 1, this embodiment provides a further technical solution for the electrostatic elimination mechanism 4.

[0053] The electrostatic elimination mechanism 4 includes a winding drum 43, a roller 44, and an extension cylinder 46. The roller 44 and the extension cylinder 46 are both rotatably installed inside the detection chassis 1, and an anti-static winding film 41 for squeezing the thermosensitive film 7 and eliminating surface static electricity is wound around the outer surfaces of the roller 44, the extension cylinder 46, and the winding drum 43 together.

[0054] The electrostatic elimination mechanism 4 includes an extrusion cylinder 45 and two drive gearboxes 42. The winding drum 43 is rotatably installed inside the two drive gearboxes 42, the extrusion cylinder 45 is rotatably installed inside the detection chassis 1, and the thermosensitive film 7 is wound around the outer surface of the extrusion cylinder 45.

[0055] It should be noted that the thermosensitive film 7 is first wound around the surface of the extrusion cylinder 45, and the provided anti-static winding film 41 is wound around the outer surfaces of the roller 44, the winding drum 43, and the extrusion cylinder 45 together. When the thermosensitive film 7 is continuously conveyed forward, the extrusion cylinder 45 will also rotate accordingly. The provided drive gearbox 42 will drive the winding drum 43 to rotate, drive the anti-static winding film 41 to drive through the winding drum 43, and the provided roller 44 and extension cylinder 46 will also rotate accordingly. The surface of the thermosensitive film 7 will contact the surface of the anti-static winding film 41, and the provided roller 44 and extension cylinder 46 cooperate with the extrusion cylinder 45 to squeeze the surface of the thermosensitive film 7. The flexible extrusion of the anti-static winding film 41 can increase the flatness of the surface of the thermosensitive film 7, and the anti-static winding film 41 is made of a material that eliminates static electricity and can eliminate the static electricity on the surface of the thermosensitive film 7, preventing dust adsorption during the conveying process.

[0056] Among them, the anti-static winding film 41, when used in conjunction with the extrusion cylinder 45, the roller 44, and the extension cylinder 46, can gently and effectively extrude the thermal film 7, thereby significantly improving the flatness of its surface. The anti-static winding film 41 made of flexible material will not cause hard damage or deformation when contacting the thermal film 7. The anti-static winding film 41 is made of a material that eliminates static electricity and can continuously neutralize the static charges on the surface of the thermal film 7 during the conveying process, avoiding the adsorption of dust or other particulate matter due to static electricity, and keeping the surface clean. A clean and dust-free surface helps machine vision and other detection means to obtain more accurate results and reduces misjudgment caused by surface contamination.

[0057] The drive gearbox 42 drives the winding drum 43 to rotate, thereby driving the anti-static winding film 41 to move, making the overall movement more coordinated and consistent, ensuring the stable forward conveyance of the thermal film 7, and reducing the risk of slippage or jamming of the thermal film 7 during the conveying process. The contact mode between the flexible anti-static winding film 41 and the surface of the thermal film 7 is relatively gentle and will not damage the coating on it. Especially after the heat curing treatment, the integrity and optical properties of the coating are further protected.

[0058] Embodiment 3: Based on the supplementary lighting mechanism 6 and the vision detection mechanism 5 proposed in Embodiment 1, this embodiment provides a further technical solution for the supplementary lighting mechanism 6 and the vision detection mechanism 5.

[0059] The supplementary lighting mechanism 6 includes a central line rod 65 rotatably installed inside the detection chassis 1. An installation disk 64 is arranged outside the central line rod 65. A light-transmitting cylinder 61 is arranged on the outer surface of the installation disk 64. The thermal film 7 is wound around the outer surface of the light-transmitting cylinder 61. A second bearing ring 66 and a first bearing ring 63 are arranged on the inner wall of the light-transmitting cylinder 61. An installation frame 67 is jointly arranged on the inner walls of the first bearing ring 63 and the second bearing ring 66.

[0060] It should be noted that when visually detecting the thermal film 7, the thermal film 7 is conveyed to the surface of the light-transmitting cylinder 61 after being stretched by the static electricity elimination mechanism 4. The provided light-transmitting cylinder 61 is in a cylindrical shape. Through the light-transmitting cylinder 61, the thermal film 7 can be further stretched to make its surface taut for visual detection, and the provided light-transmitting cylinder 61 is made of a transparent material and has good light transmittance.

[0061] The vision detection mechanism 5 includes an installation box 51. The installation box 51 is installed on the upper inner wall of the detection chassis 1 through a telescopic rod. A ventilation pipe 52 is arranged at the upper end of the installation box 51. One end of the ventilation pipe 52 communicates with the inside of the purification air box 2. Side plates 53 are arranged on both sides of the lower end of the installation box 51. Roller rods 54 are rotatably installed at the lower ends of the two side plates 53. A guiding plate 55 for guiding the air flow direction is arranged inside the installation box 51.

[0062] Among them, when the thermal film 7 is wound around the surface of the light-transmitting cylinder 61, the roller rod 54 provided will also squeeze the thermal film 7 wound around the surface of the light-transmitting cylinder 61. The purification air box 2 blows cold air through the ventilation pipe 52 and then blows it onto the surface of the thermal film 7 through the guiding plate 55. Guiding the wind to blow on the surface of the thermal film 7 through the guiding plate 55 can remove the dust on the surface of the thermal film 7 and can also cool the thermal film 7, enabling the thermal film 7 to be detected at a suitable temperature. Moreover, after the cooled thermal film 7 shrinks, the defects on the surface are more likely to appear in a tensioned state.

[0063] Among them, the static elimination mechanism 4 ensures that the surface of the thermal film 7 is free of static electricity before entering the detection stage, reducing the possibility of dust being adsorbed by static electricity, thereby keeping the surface clean. After static elimination, the thermal film 7 is more stretched, reducing wrinkles and slack. Then, the cylindrical shape design of the light-transmitting cylinder 61 can further stretch the thermal film 7, making its surface tight for precise detection by machine vision and reducing image distortion or aberration.

[0064] The light-transmitting cylinder 61 made of transparent material has excellent light-transmitting performance, ensuring sufficient light penetrates to the surface of the thermal film 7, which helps to identify minute defects. The roller rod 54 moderately squeezes the thermal film 7 wound around the surface of the light-transmitting cylinder 61 to ensure that it maintains appropriate tension throughout the detection process, avoiding loosening or slipping.

[0065] The squeezing effect makes the thermal film 7 in close contact with the surface of the light-transmitting cylinder 61, ensuring uniform distribution of light. The cold air blown by the purification air box 2 through the ventilation pipe 52 and the guiding plate 55 can effectively remove the dust and other particulate matters on the surface of the thermal film 7, ensuring the surface is clean and free of impurities. The cold air also cools the heated thermal film 7, enabling it to quickly return to the appropriate working temperature and preventing high temperature from affecting the detection accuracy or material properties.

[0066] The cooled thermal film 7 will undergo slight shrinkage, making surface defects such as scratches and bubbles more likely to appear in a tensioned state, improving the sensitivity and accuracy of detection. Rapid cooling helps to lock the state of the cured coating.

[0067] The interior of the mounting frame 67 is divided into a light chamber and a dark chamber by the central partition 613. The inner wall of the light chamber is provided with a reflective arc piece 69, and an illuminating lamp 611 is arranged inside the reflective arc piece 69. The reflective arc piece 69 is in the shape of a semi-cylindrical tube, and the inner wall of the reflective arc piece 69 is provided with a reflective coating.

[0068] A condenser ring 59 is arranged at the lower end of the second detection camera 58, and a lamp ring 513 is arranged inside the condenser ring 59.

[0069] It should be noted that when the thermal film 7 is wound around the surface of the light-transmitting cylinder 61, the illuminating lamp 611 can emit light, and then the reflected light from the reflective arc plate 69 passes through the light-transmitting cylinder 61 and irradiates the lower surface of the thermal film 7. Also, the lamp ring 513 cooperates with the light-gathering ring 59 to irradiate light on the upper surface of the thermal film 7, enabling the thermal film 7 to be irradiated through light permeability, allowing the second detection camera 58 to quickly detect defects on the surface of the thermal film 7.

[0070] Among them, the combination of the illuminating lamp 611 and the reflective arc plate 69 ensures that light can uniformly pass through the light-transmitting cylinder 61 and irradiate the lower surface of the thermal film 7, providing a bright and consistent background light source. The lamp ring 513 cooperates with the light-gathering ring 59 to concentrate the light and irradiate it on the upper surface of the thermal film 7, enhancing the local light intensity while maintaining the uniformity of the illumination.

[0071] The synchronous irradiation of the upper and lower surfaces enables any tiny defects on the surface of the thermal film 7, such as scratches, bubbles, stains, etc., to be clearly shown against a high-contrast background, improving the recognition ability of the second detection camera 58. Through the carefully designed optical path, unnecessary shadows and reflections are reduced, ensuring the clarity and accuracy of the image.

[0072] Sufficient lighting conditions enable the second detection camera 58 to capture high-quality images in a short time. The high-brightness and high-contrast lighting contribute to the identification of very subtle defects, ensuring the comprehensiveness and reliability of the detection.

[0073] The inner wall of the darkroom is provided with a bottom light plate 612. The bottom light plate 612 fits on the inner wall of the light-transmitting cylinder 61, and a light control lamp is arranged inside the bottom light plate 612.

[0074] The inner wall of the installation box 51 is provided with a partition plate 56. The partition plate 56 is located in the middle of the guiding plate 55. On both sides of the partition plate 56, there are respectively a second detection camera 58 and a camera holder 512. A first detection camera 57 is arranged inside the camera holder 512, and a pressure roller 511 is arranged at the lower end of the partition plate 56.

[0075] It should be noted that after the thermal film 7 is detected by the second detection camera 58, it will be rolled by the pressure roller 511 and sent under the first detection camera 57. The provided bottom light plate 612 fits on the inner wall of the light-transmitting cylinder 61 and emits light as a backlight plate. Also, the space where the first detection camera 57 is located is blocked by the partition plate 56, making the light refracted by the light-gathering ring 59 and the reflective arc plate 69 unable to irradiate into the space where the first detection camera 57 is located. When the bottom light plate 612 serves as the backlight plate, the first detection camera 57 can detect whether the surface coating of the thermal film 7 is uniform according to the light penetration.

[0076] Among them, the partition plate 56 blocks the light refracted by the focusing ring 59 and the reflective arc plate 69, ensuring that the space where the first detection camera 57 is located has independent lighting conditions, avoiding the influence of other light sources on the detection results, and using the specially set bottom light plate 612 as a backlight plate to accurately control the light intensity and distribution, provide a stable background light source, thereby improving the accuracy and consistency of detection.

[0077] The uniform light source emitted by the bottom light plate 612 illuminates from behind the thermal film 7, so that the coating thickness and uniformity are clearly visible under high contrast, and any unevenness will be clearly shown in the image for easy identification.

[0078] By utilizing the penetrability of light, the first detection camera 57 can more effectively detect the uniformity of the coating on the surface of the thermal film 7, especially for transparent or translucent coatings, and can detect slight thickness differences and defects. Under backlight conditions, bubbles, cracks or other minor defects in the coating will be more obvious, which helps to improve the sensitivity of detection. Adequate backlight conditions enable the first detection camera 57 to capture high-quality images in a short time, speeding up the detection speed without sacrificing accuracy.

[0079] A central partition plate 613 is provided in the middle of the inner wall of the installation frame 67, and a slide block 614 is provided on the central partition plate 613 and one end of the installation frame 67. A brush plate 68 for cleaning the inner wall of the light-transmitting tube 61 is provided inside the slide block 614. A connecting ring plate 62 is provided at one end of the installation frame 67, and one end of the connecting ring plate 62 is connected to the inner wall of the detection chassis 1.

[0080] Among them, the set center line rod 65 will drive the light-transmitting tube 61 to rotate through the mounting disc 64, and the set second bearing ring 66 and the first bearing ring 63 can ensure that the mounting frame 67 will not rotate when the light-transmitting tube 61 rotates. When the light-transmitting tube 61 rotates, the brush plate 68 can clean the inner wall of the light-transmitting tube 61 to ensure that the light-transmitting tube 61 has good light transmittance.

[0081] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A defect detection device for processing new materials of thermal film based on machine vision, comprising a detection chassis (1), characterized in that: A thermal film (7) is arranged inside the detection box (1); a heat treatment mechanism (3) for baking the thermal film (7) is arranged on one side of the upper end of the detection box (1); a visual inspection mechanism (5) for cleaning the surface of the thermal film (7) and performing a cooling treatment is arranged inside the detection box (1); a fill light mechanism (6) for providing two inspection environments for the visual inspection mechanism (5) is arranged inside the detection box (1) and below the visual inspection mechanism (5); a static elimination mechanism (4) for eliminating static electricity on the surface of the thermal film (7) and performing stretching is arranged inside the detection box (1) and on one side of the heat treatment mechanism (3); and a purification bellows (2) is arranged on one side of the detection box (1); The static elimination mechanism (4) comprises a winding drum (43), a roller (44) and an extension drum (46), wherein the roller (44) and the extension drum (46) are both rotatably mounted inside the detection cabinet (1), and an anti-static film (41) for pressing the thermal film (7) and eliminating surface static electricity is wound around the outer surfaces of the roller (44), the extension drum (46) and the winding drum (43); The fill light mechanism (6) comprises a centerline rod (65) rotatably mounted inside the detection chassis (1); a mounting disc (64) is arranged outside the centerline rod (65); a light-transmitting tube (61) is arranged on the outer surface of the mounting disc (64); the heat-sensitive film (7) is wound around the outer surface of the light-transmitting tube (61); a second bearing ring (66) and a first bearing ring (63) are arranged on the inner wall of the light-transmitting tube (61); and a mounting frame (67) is provided on the inner walls of the first bearing ring (63) and the second bearing ring (66); A central partition (613) is provided in the middle of the inner wall of the installation frame (67), and a slide block (614) is provided at one end of the central partition (613) and the installation frame (67). A brush plate (68) for cleaning the inner wall of the light-transmitting cylinder (61) is provided inside the slide block (614). A connecting ring plate (62) is provided at one end of the installation frame (67), and one end of the connecting ring plate (62) is connected to the inner wall of the detection chassis (1); The interior of the installation frame (67) is divided into a bright room and a dark room by a central partition (613); a reflective arc sheet (69) is provided on the inner wall of the bright room, and a lighting lamp (611) is provided inside the reflective arc sheet (69); the reflective arc sheet (69) is in the shape of a semicircular tube, and a reflective coating is provided on the inner wall of the reflective arc sheet (69).

2. The defect detection device for processing new thermal film materials based on machine vision according to claim 1 is characterized in that: The static elimination mechanism (4) comprises an extrusion cylinder (45) and two drive gear boxes (42), and the winding cylinder (43) is rotatably mounted inside the two drive gear boxes (42), the extrusion cylinder (45) is rotatably mounted inside the detection chassis (1), and the thermal film (7) is wound around the outer surface of the extrusion cylinder (45).

3. The defect detection device for processing new thermal film materials based on machine vision according to claim 1 is characterized in that: Two push rods (8) are arranged on one side of the inner wall of the detection cabinet (1), and a push cylinder (9) is rotatably mounted on one end of the two push rods (8).

4. The defect detection device for processing new thermal film materials based on machine vision according to claim 1 is characterized in that: The inner wall of the darkroom is provided with a bottom light plate (612), the bottom light plate (612) is attached to the inner wall of the light-transmitting tube (61), and a light control lamp is provided inside the bottom light plate (612).

5. The defect detection device for processing new thermal film materials based on machine vision according to claim 1 is characterized in that: The visual inspection mechanism (5) comprises an installation box (51), the installation box (51) being installed on the upper part of the inner wall of the inspection box (1) via a telescopic rod, a ventilation pipe (52) being provided at the upper end of the installation box (51), one end of the ventilation pipe (52) being communicated with the interior of the purification air box (2), side panels (53) being provided on both sides of the lower end of the installation box (51), roller rods (54) being rotatably installed at the lower ends of the two side panels (53), and a guide plate (55) for guiding the air flow direction being provided inside the installation box (51).

6. The defect detection device for processing new thermal film materials based on machine vision according to claim 5 is characterized in that: The inner wall of the installation box (51) is provided with a partition plate (56), the partition plate (56) is located in the middle of the guide plate (55), and a second detection camera (58) and a camera frame (512) are respectively provided on both sides of the partition plate (56), a first detection camera (57) is provided inside the camera frame (512), and a pressure roller (511) is provided at the lower end of the partition plate (56).

7. The defect detection device for processing new thermal film materials based on machine vision according to claim 6 is characterized in that: A light-focusing ring (59) is provided at the lower end of the second detection camera (58), and a light ring (513) is provided inside the light-focusing ring (59).

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