Defect detection device for processing novel thermosensitive film material based on machine vision

Abstract

The invention discloses a machine vision-based defect detection device for processing a novel thermosensitive film material, and relates to the technical field of thermosensitive film defect detection.The machine vision-based defect detection device comprises a detection case, a thermosensitive film is arranged in the detection case, and a heat treatment mechanism for baking the thermosensitive film is arranged on one side of the upper end of the detection case; and a visual detection mechanism for cleaning the surface of the thermosensitive film and performing cooling treatment is arranged in the detection case. The anti-electric roll film is matched with the extrusion cylinder, the roller and the extension cylinder for use, so that the thermosensitive film can be softly and effectively extruded, the surface flatness of the thermosensitive film is remarkably improved, the anti-electric roll film made of a flexible material cannot cause hard damage or deformation when being in contact with the thermosensitive film, and the service life of the thermosensitive film is prolonged. The anti-electricity roll film is made of static electricity eliminating materials, static charges on the surface of the thermosensitive film can be continuously neutralized in the conveying process, dust or other particles are prevented from being adsorbed by static electricity, and the surface is kept 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-mentioned purpose, the present application provides the following technical solutions: a defect detection device for processing new materials of thermal film based on machine vision, comprising a detection chassis, a thermal film is arranged inside the detection chassis, a heat treatment mechanism for baking the thermal film is arranged on one side of the upper end of the detection chassis, a visual detection mechanism for cleaning the surface of the thermal film and performing a temperature reduction treatment is arranged inside the detection chassis, a fill light mechanism for providing two detection environments for the visual detection mechanism is arranged inside the detection chassis and below the visual detection mechanism, a static elimination mechanism for eliminating static electricity on the surface of the thermal film and stretching it is arranged inside the detection chassis and on one side of the heat treatment mechanism, and a purification bellows is arranged on one side of the detection chassis; The static elimination mechanism includes a winding drum, a roller and an extension drum, which are both rotatably installed inside the detection chassis, and the outer surfaces of the roller, the extension drum and the winding drum are commonly wound with an anti-static film for squeezing the thermal film and eliminating surface static electricity.

[0006] The static elimination mechanism includes an extrusion cylinder and two drive gear boxes, and the winding cylinder is rotatably installed inside the two drive gear boxes, the extrusion cylinder is rotatably installed inside the detection chassis, and the thermal film is wound around the outer surface of the extrusion cylinder.

[0007] Wherein, two push rods are arranged on one side of the inner wall of the detection box, and a push cylinder is rotatably mounted on one end of the two push rods.

[0008] Among them, the fill light mechanism includes a center line rod rotatably installed inside the detection chassis, a mounting disk is arranged outside the center line rod, a light-transmitting tube is arranged on the outer surface of the mounting disk, the thermal film is wound around the outer surface of the light-transmitting tube, a second bearing ring and a first bearing ring are arranged on the inner wall of the light-transmitting tube, and a mounting frame is arranged on the inner walls of the first bearing ring and the second bearing ring.

[0009] Among them, a central partition is arranged in the middle of the inner wall of the installation frame, and a slide block is arranged on the central partition and one end of the installation frame. A brush plate for cleaning the inner wall of the light-transmitting tube is arranged inside the slide block, and a connecting ring plate is arranged at one end of the installation frame, and one end of the connecting ring plate is connected to the inner wall of the detection chassis.

[0010] The interior of the installation frame is divided into a bright room and a dark room by a central partition, the inner wall of the bright room is provided with a reflective arc sheet, and a lighting lamp is provided inside the reflective arc sheet. The reflective arc sheet is in a semicircular tube shape, and the inner wall of the reflective arc sheet is provided with a reflective coating.

[0011] The inner wall of the darkroom is provided with a bottom light plate, the bottom light plate is attached to the inner wall of the light-transmitting tube, and a light-control lamp is arranged inside the bottom light plate.

[0012] Among them, the visual inspection mechanism includes an installation box, which is installed on the upper part of the inner wall of the detection box through a telescopic rod. A ventilation pipe is provided at the upper end of the installation box, one end of the ventilation pipe is connected to the interior of the purification air box, and side panels are provided on both sides of the lower end of the installation box. Roller rods are rotatably installed at the lower ends of the two side panels, and a guide plate for guiding the air flow is provided inside the installation box.

[0013] Among them, the inner wall of the installation box is provided with a partition plate, the partition plate is located in the middle of the guide plate, and the second detection camera and the camera frame are respectively provided on both sides of the partition plate, the first detection camera is provided inside the camera frame, and the lower end of the partition plate is provided with a pressure roller.

[0014] Wherein, a focusing ring is arranged at the lower end of the second detection camera, and a light ring is arranged inside the focusing ring.

[0015] In summary, the technical effects and advantages of the present invention are as follows: 1. The anti-static film provided by the present invention is used in conjunction with the extrusion cylinder, roller and extension cylinder to gently and effectively extrude the thermal film, thereby significantly improving the flatness of its surface. The anti-static film made of flexible material will not cause hard damage or deformation when in contact with the thermal film. The anti-static film is made of static-eliminating material and can continuously neutralize the static charge on the surface of the thermal film during transportation, avoiding the adsorption of dust or other particles due to static electricity, and keeping the surface clean. A clean and dust-free surface helps machine vision and other detection methods to obtain more accurate results, and reduces misjudgments caused by surface contamination. The drive gear box drives the winding drum to rotate, and then pulls the anti-static film to drive, making the overall movement more coordinated and consistent, ensuring that the thermal film is smoothly conveyed forward, reducing the risk of slippage or jamming of the thermal film during transportation, and the flexible anti-static film is in gentle contact with the surface of the thermal film, and will not damage the coating thereon, especially after being heated and cured, further protecting the integrity and optical properties of the coating.

[0016] 2. The cold air blown out by the purification bellows through the ventilation pipe and the guide plate in the present invention can effectively remove dust and other particles on the surface of the thermal film, ensuring that the surface is clean and free of impurities. The cold air also cools the heated thermal film to quickly restore it to a suitable working temperature to prevent high temperature from affecting the detection accuracy or material properties. The cooled thermal film will shrink slightly, making surface defects (such as scratches, bubbles, etc.) more visible under tension, improving the sensitivity and accuracy of the detection, and rapid cooling helps to lock the state of the cured coating.

[0017] 3. The combination of the lighting lamp and the reflective arc sheet in the present invention ensures that the light can be evenly transmitted through the light-transmitting tube to the lower surface of the thermal film, providing a bright and consistent background light source. The light ring cooperates with the focusing ring to focus the light on the upper surface of the thermal film, enhancing the local light intensity while maintaining the uniformity of the light. The synchronous illumination of the upper and lower surfaces allows any tiny 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. Adequate lighting conditions enable the second detection camera to capture high-quality images in a short time. High brightness and high-contrast lighting help identify very subtle defects, ensuring the comprehensiveness and reliability of the detection.

[0018] 4. The middle partition of the present invention blocks the light refracted by the focusing ring and the reflective arc sheet, 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. The specially set bottom light plate is used as a backlight plate, which can accurately control the light intensity and distribution, provide a stable background light source, and thus improve the accuracy and consistency of the detection. The uniform light source emitted by the bottom light plate illuminates from the back of the thermal film, so that the coating thickness and uniformity are clearly visible under high contrast, and any uneven areas will be clearly visible 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 translucent coatings, and can detect tiny thickness differences and defects. Under backlight conditions, bubbles, cracks or other subtle defects in the coating will be more obvious, which helps to improve the sensitivity of the detection. Adequate backlight conditions enable the first detection camera to capture high-quality images in a short time, speeding up the detection speed without sacrificing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of a defect detection device for processing new materials of thermal film based on machine vision; Figure 2 It is a three-dimensional structural cross-sectional view of a defect detection device for processing new materials of thermal film based on machine vision; Figure 3It is a schematic diagram of the partial three-dimensional connection structure of a defect detection device for processing new materials of thermal film based on machine vision; Figure 4 It is a schematic diagram of the first-person perspective stereoscopic connection structure of the static elimination mechanism, the visual detection mechanism and the fill light mechanism; Figure 5 A schematic diagram of a second-viewing angle stereoscopic connection structure of a static elimination mechanism, a visual detection mechanism, and a fill light mechanism; Figure 6 A schematic diagram of a first-person perspective three-dimensional connection structure of an electrostatic elimination mechanism; Figure 7 A schematic diagram of a second-view three-dimensional connection structure of the static elimination mechanism; Figure 8 A schematic diagram of a three-dimensional connection structure of a static elimination mechanism from a third-person perspective; Fig. 9 It is a schematic diagram of the three-dimensional connection structure of the visual detection mechanism and the fill light mechanism; Fig.10 It is a cross-sectional view of the three-dimensional connection structure of the fill light mechanism; Fig.11 It is a schematic diagram of the local three-dimensional connection structure of the fill light mechanism; Fig.12 It is a schematic diagram of the stereoscopic connection structure of the reflective arc sheet and the bottom light plate from the first perspective; Fig.13 A schematic diagram of a second-view three-dimensional connection structure of a reflective arc sheet and a bottom light sheet; Fig.14 It is a schematic diagram of the first-person perspective stereoscopic connection structure of the visual detection mechanism; Fig.15 It is a cross-sectional view of the three-dimensional connection structure of the visual detection mechanism; Fig.16 It is a second-viewing perspective three-dimensional connection structure plan view of the visual detection mechanism; Fig.17 It is a schematic diagram of the third-view stereoscopic connection structure of the visual detection mechanism; Fig.18 It is a schematic diagram of the fourth perspective three-dimensional connection structure of the visual detection mechanism.

[0021] In the figure: 1, detection box; 2, purification bellows; 3, heat treatment mechanism; 4, static elimination mechanism; 41, anti-static film; 42, drive gear box; 43, winding drum; 44, roller; 45, extrusion drum; 46, extension drum; 5, visual detection mechanism; 51, installation box; 52, ventilation pipe; 53, side plate; 54, roller rod; 55, guide plate; 56, partition plate; 57, first detection camera; 58, second detection camera; 59, focusing Halo; 511, pressure roller; 512, camera frame; 513, light ring; 6, fill light mechanism; 61, light tube; 62, connecting ring plate; 63, first bearing ring; 64, mounting disc; 65, center line rod; 66, second bearing ring; 67, mounting frame; 68, brush plate; 69, reflective arc sheet; 611, lighting lamp; 612, bottom light plate; 613, center partition; 614, slide block; 7, thermal film; 8, push rod; 9, push cylinder. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0023] Example 1, Reference Figures 1 to 18 The defect detection device for processing new materials of thermal film based on machine vision shown in the figure comprises 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 fill light mechanism 6 for providing two detection environments for the visual detection mechanism 5 is arranged inside the detection chassis 1 and below the visual detection mechanism 5, a static elimination mechanism 4 for eliminating static electricity on the surface of the thermal film 7 and stretching it is arranged inside the detection chassis 1 and on one side of the heat treatment mechanism 3, and a purification bellows 2 is arranged on one side of the detection chassis 1; 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 .

[0024] It is worth noting that when the thermal film 7 is inspected, the thermal film 7 is passed through the heat treatment mechanism 3 and the static elimination mechanism 4, and then passed between the visual inspection mechanism 5 and the light supplement mechanism 6, and finally rolled onto the winding drum after being squeezed by the push cylinder 9, and the push rod 8 is used to adjust the position of the push cylinder 9 to control the squeezing force on the thermal film 7; After the surface of the thermal film 7 is coated with a material coating, it is transported to the interior of the heat treatment mechanism 3. After being cured by the heat treatment mechanism 3, the thermal film 7 is transported to the interior of the static elimination mechanism 4. The static elimination mechanism 4 is set to tension the heated thermal film 7, so that the thermal film 7 can be kept in a flat state after being tensioned, avoiding the coating distortion caused by relaxation or wrinkles, which will cause surface irregularities and interfere with defect recognition. When the thermal film 7 is in a properly tensioned state, its thickness distribution is more uniform, and the static elimination mechanism 4 can also perform static elimination on its surface when rolling and extruding the thermal film 7; Among them, the thermal film 7 is cured by the heat treatment mechanism 3, ensuring that the surface material coating can be fully cured, and the static elimination mechanism 4 not only eliminates the static charge on the surface of the thermal film 7, but also keeps the film in a flat state through appropriate tensioning treatment, avoiding false detection problems caused by static electricity adsorbing dust or other particles.

[0025] The tensioning treatment of the static elimination mechanism 4 enables the thermal film 7 to remain in a flat state when entering the visual inspection stage, reducing image distortion and distortion caused by relaxation or wrinkles, thereby improving the accuracy of defect recognition. Moreover, after the tensioning treatment, the thickness distribution of the thermal film 7 is more uniform, and the flat and non-deformed surface of the thermal film 7 is conducive to the visual inspection mechanism 5 to capture high-resolution, non-distorted images, thereby improving the machine vision inspection performance.

[0026] Proper tensioning can prevent the film from shaking or slipping during transportation, reduce the risk of motion blur, and ensure that the visual inspection mechanism 5 can obtain a clear image every time it takes a picture. In addition, the static elimination mechanism 4 helps stabilize the position of the thermal film 7 on the conveyor belt, so that it moves along a predetermined path and avoids deviation or jamming. Proper tensioning can reduce the friction between the thermal film 7 and the conveyor belt or other contact surfaces to a certain extent. By adjusting the position of the push cylinder 9 through the push rod 8, the squeezing force on the thermal film 7 can be accurately controlled to ensure that the film will not be damaged due to excessive squeezing during the winding process, and at the same time, the problem of loose winding caused by insufficient squeezing force can be avoided.

[0027] When the thermal film 7 passes between the fill light mechanism 6 and the visual inspection mechanism 5, the fill light mechanism 6 performs fill light processing on the thermal film 7, and the visual inspection mechanism 5 can respectively detect the coating thickness of the thermal film 7 and the surface of the thermal film 7, and the visual inspection mechanism 5 can also perform cooling processing on the thermal film 7, so that the thermal film 7 can be quickly cooled after being heated.

[0028] Among them, the uniform and sufficient lighting provided by the fill light mechanism 6 ensures that the surface of the thermal film 7 has sufficient brightness contrast during visual inspection. Appropriate fill light can reduce shadow and reflection problems caused by insufficient or uneven light source, ensuring more accurate detection results.

[0029] The visual inspection mechanism 5 is capable of accurately measuring the coating thickness of the thermal film 7. By real-time monitoring of the coating thickness, any situation out of tolerance can be immediately identified during the production process. The visual inspection mechanism 5 can also conduct a comprehensive inspection of the surface of the thermal film 7, identify and record various types of defects, such as scratches, bubbles, stains, etc., to ensure that the final product is flawless.

[0030] Embodiment 2: Based on the static electricity elimination mechanism 4 proposed in Embodiment 1, this embodiment provides a further technical solution of the static electricity elimination mechanism 4.

[0031] The static elimination mechanism 4 includes a winding drum 43, a roller 44 and an extension drum 46. The roller 44 and the extension drum 46 are both rotatably installed inside the detection chassis 1, and the outer surfaces of the roller 44, the extension drum 46 and the winding drum 43 are commonly wound with an anti-static film 41 for squeezing the thermal film 7 and eliminating surface static electricity.

[0032] The static elimination mechanism 4 includes an extrusion cylinder 45 and two driving gear boxes 42 , and the winding cylinder 43 is rotatably installed inside the two driving gear boxes 42 , the extrusion cylinder 45 is rotatably installed inside the detection chassis 1 , and the thermal film 7 is wound around the outer surface of the extrusion cylinder 45 .

[0033] It is worth mentioning that the thermal film 7 is first wound on the surface of the extrusion cylinder 45, and the anti-static film 41 is jointly wound on the outer surfaces of the roller 44, the winding roller 43 and the extrusion cylinder 45. When the thermal film 7 is continuously conveyed forward, the extrusion cylinder 45 will also rotate, and the driving gear box 42 will drive the winding roller 43 to rotate, and the anti-static film 41 will be driven by the winding roller 43. The roller 44 and the extension cylinder 46 will also rotate accordingly, and the surface of the thermal film 7 will contact the surface of the anti-static film 41, and the roller 44 and the extension cylinder 46 cooperate with the extrusion cylinder 45 to squeeze the surface of the thermal film 7. The flexible extrusion of the anti-static film 41 can increase the flatness of the surface of the thermal film 7, and the anti-static film 41 is made of static-eliminating material, which can eliminate static electricity on the surface of the thermal film 7 and prevent dust from being adsorbed during transportation.

[0034] Among them, the anti-static roll film 41 is used in conjunction with the extrusion cylinder 45, the roller 44 and the extension cylinder 46, which can gently and effectively extrude the thermal film 7, thereby significantly improving the flatness of its surface. The anti-static roll film 41 made of flexible material will not cause hard damage or deformation when contacting the thermal film 7. The anti-static roll film 41 is made of static-eliminating material and can continuously neutralize the static charge on the surface of the thermal film 7 during transportation, avoiding the adsorption of dust or other particles due to static electricity, and keeping the surface clean. The clean and dust-free surface helps machine vision and other detection methods to obtain more accurate results and reduce misjudgments caused by surface contamination.

[0035] The driving gear box 42 drives the winding drum 43 to rotate, and then pulls the anti-static film 41 to transmit, making the overall movement more coordinated and consistent, ensuring the smooth forward conveyance of the thermal film 7, reducing the risk of slippage or jamming of the thermal film 7 during the conveyance process, and the contact between the flexible anti-static film 41 and the surface of the thermal film 7 is relatively gentle, and will not cause damage to the coating thereon, especially after the heat curing treatment, further protecting the integrity and optical properties of the coating.

[0036] Embodiment 3: Based on the fill light mechanism 6 and the visual detection mechanism 5 proposed in Embodiment 1, this embodiment provides a further technical solution for the fill light mechanism 6 and the visual detection mechanism 5.

[0037] The fill light mechanism 6 includes a centerline rod 65 rotatably mounted inside the detection chassis 1, a mounting disk 64 is arranged outside the centerline rod 65, a light-transmitting tube 61 is arranged on the outer surface of the mounting disk 64, a thermal 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 arranged on the inner walls of the first bearing ring 63 and the second bearing ring 66.

[0038] It is worth mentioning that when the thermal film 7 is visually inspected, the thermal film 7 is stretched by the static elimination mechanism 4 and then transported to the surface of the light-transmitting tube 61, and the light-transmitting tube 61 is cylindrical in shape, and the thermal film 7 can be further stretched by the light-transmitting tube 61 to make its surface tight for visual inspection, and the light-transmitting tube 61 is made of transparent material and has good light transmittance.

[0039] The visual inspection mechanism 5 includes an installation box 51, which is installed on the upper part of the inner wall of the detection chassis 1 through a telescopic rod. A ventilation pipe 52 is provided at the upper end of the installation box 51, and one end of the ventilation pipe 52 is communicated with the interior of the purification air box 2. Side panels 53 are provided on both sides of the lower end of the installation box 51, and roller rods 54 are rotatably installed at the lower ends of the two side panels 53. A guide plate 55 for guiding the air flow is provided inside the installation box 51.

[0040] Among them, when the thermal film 7 is wound on the surface of the light-transmitting tube 61, the roller rod 54 will also squeeze the thermal film 7 wound on the surface of the light-transmitting tube 61, and the purification air box 2 blows out cold air through the ventilation pipe 52 and then blows it on the surface of the thermal film 7 through the guidance of the guide plate 55. The wind guided by the guide plate 55 to blow on the surface of the thermal film 7 can remove dust on the surface of the thermal film 7, and at the same time, the thermal film 7 can also be cooled, so that the thermal film 7 can be tested at a suitable temperature, and the surface defects of the cooled thermal film 7 are more easily visible under the tension after shrinkage.

[0041] Among them, the static electricity elimination mechanism 4 ensures that there is no static electricity on the surface of the thermal film 7 before entering the detection stage, reducing the possibility of dust adsorbed by static electricity, thereby keeping the surface clean. After static electricity elimination, the thermal film 7 is more stretched, with less wrinkles and looseness. Then the cylindrical shape design of the light-transmitting tube 61 can further stretch the thermal film 7, making its surface tight to facilitate accurate detection by machine vision and reduce image distortion or distortion.

[0042] The light-transmitting tube 61 made of transparent material has excellent light-transmitting properties, ensuring that sufficient light penetrates the surface of the thermal film 7, which is helpful to identify tiny defects. The roller rod 54 moderately squeezes the thermal film 7 wrapped around the surface of the light-transmitting tube 61 to ensure that it maintains appropriate tension during the entire detection process to avoid loosening or slipping.

[0043] The squeezing effect makes the thermal film 7 in close contact with the surface of the light-transmitting tube 61, ensuring the uniform distribution of light. The cold air blown out by the purification bellows 2 through the ventilation pipe 52 and the guide plate 55 can effectively remove the dust and other particles on the surface of the thermal film 7, ensuring that the surface is clean and free of impurities. The cold air also cools the heated thermal film 7, allowing it to quickly return to a suitable working temperature, preventing high temperature from affecting the detection accuracy or material properties.

[0044] After cooling, the thermal film 7 will shrink slightly, making surface defects such as scratches and bubbles more visible under tension, thereby improving the sensitivity and accuracy of detection. Rapid cooling helps to lock the state of the coating after curing.

[0045] The interior of the mounting frame 67 is divided into a bright room and a dark room by a central partition 613. The inner wall of the bright room is provided with a reflective arc sheet 69, and a lighting lamp 611 is provided inside the reflective arc sheet 69. The reflective arc sheet 69 is in a semicircular tube shape, and the inner wall of the reflective arc sheet 69 is provided with a reflective coating.

[0046] A focusing ring 59 is disposed at the lower end of the second detection camera 58 , and a light ring 513 is disposed inside the focusing ring 59 .

[0047] It is worth mentioning that when the thermal film 7 is wound around the surface of the light-transmitting tube 61, the lighting lamp 611 can irradiate the light and then the reflective arc sheet 69 reflects the light through the light-transmitting tube 61 to illuminate the lower surface of the thermal film 7, and the light ring 513 will also cooperate with the focusing ring 59 to illuminate the upper surface of the thermal film 7, so that the thermal film 7 can be illuminated by the light to allow the second detection camera 58 to quickly detect defects on the surface of the thermal film 7.

[0048] Among them, the combination of the lighting lamp 611 and the reflective arc sheet 69 ensures that light can evenly pass through the light-transmitting tube 61 to illuminate the lower surface of the thermal film 7, providing a bright and consistent background light source. The light ring 513 cooperates with the focusing ring 59 to concentrate the light on the upper surface of the thermal film 7, thereby enhancing the local light intensity while maintaining the uniformity of the light.

[0049] The synchronous illumination 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 displayed against a high-contrast background, thereby improving the recognition capability of the second detection camera 58. Through a carefully designed optical path, unnecessary shadows and reflections are reduced, thereby ensuring the clarity and accuracy of the image.

[0050] Adequate lighting conditions enable the second inspection camera 58 to capture high-quality images in a short time. High brightness and high contrast lighting help to identify very subtle defects, ensuring the comprehensiveness and reliability of inspection.

[0051] 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 .

[0052] The inner wall of the installation box 51 is provided with a partition plate 56, which is located in the middle of the guide plate 55, and the second detection camera 58 and the camera frame 512 are respectively provided on both sides of the partition plate 56, the first detection camera 57 is provided inside the camera frame 512, and the lower end of the partition plate 56 is provided with a pressure roller 511.

[0053] It is worth mentioning that after the thermal film 7 is inspected by the second inspection camera 58, it will be rolled by the pressure roller 511 and sent to the bottom of the first inspection camera 57, and the bottom light plate 612 is arranged to fit the inner wall of the light-transmitting tube 61 to emit a light source as a backlight plate, and the space where the first inspection camera 57 is located is blocked by the partition plate 56, so that the light refracted by the focusing ring 59 and the reflective arc plate 69 cannot shine into the space where the first inspection camera 57 is located. When the bottom light plate 612 serves as a backlight plate, the first inspection camera 57 can detect whether the surface coating of the thermal film 7 is uniform based on the transmittance of light.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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 chassis (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).

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 provided 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 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).

5. The defect detection device for processing new thermal film materials based on machine vision according to claim 4 is characterized in that: 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 at one end of the central partition plate (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).

6. The defect detection device for processing new thermal film materials based on machine vision according to claim 5 is characterized in that: 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).

7. The defect detection device for processing new thermal film materials based on machine vision according to claim 6 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).

8. 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).

9. The defect detection device for processing new thermal film materials based on machine vision according to claim 8 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).

10. The defect detection device for processing new thermal film materials based on machine vision according to claim 9, 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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