Visual inspection device

Abstract

The utility model relates to a visual inspection device, and relates to the technical field of visual inspection, the visual inspection device comprises a mounting bracket, a detection positioning frame arranged on the mounting bracket, a camera shooting unit, a front light source and a back light source, the detection positioning frame is used for limiting a product in a detection area; the front light source and the backlight source are located on the two sides of the detection positioning frame respectively, and the front light source and the camera shooting unit are arranged on the same side; the control unit is used for controlling the front light source and the back light source to emit light or not and adjusting the brightness of the front light source and the back light source; and the control unit is also used for controlling the camera shooting unit to shoot and receiving images of the camera shooting unit in real time to analyze whether the product has defects or not. According to the device, the light source configuration and the detection mode can be flexibly adjusted according to different product types and production requirements, the device is suitable for different production scenes, the labor cost can be reduced, the working efficiency can be improved, and the product quality can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of visual inspection, in particular to a visual inspection device. BACKGROUND

[0002] In the modern packaging production process, especially in the production of bagged desiccant, product quality control is the key link to ensure consumer safety and product performance. Traditional quality detection methods usually rely on manual inspection, which is not only low in efficiency, but also easily affected by human factors, resulting in unstable and inaccurate detection results.

[0003] In the production process of bagged desiccant, the appearance and sealing quality of the package have important technical requirements, especially in the following aspects: 1. Long and short bag problem: The size inconsistency of the packaging bag may affect the punching and cutting of the packaging bag or not meet the standard requirements. 2. Transverse sealing and ironing: The ironing problem of the sealing part will affect the sealing and appearance of the packaging bag, and thus affect the quality of the product. 3. Punching deviation: The deviation of the punching position will directly affect the packaging performance of the product and the user experience of the consumer. 4. False sealing: The incomplete sealing of the packaging bag leads to the entry of air and moisture and the leakage of the packaging bag contents, thereby affecting the moisture absorption effect and service life of the desiccant. These undesirable phenomena directly affect the packaging performance and use effect of the bagged desiccant. Therefore, real-time monitoring and detection of these undesirable items are required on the production line.

[0004] At present, the traditional quality detection method has significant shortcomings in dealing with these undesirable phenomena. Manual detection not only has the risk of missed detection, but also cannot timely discover defects on the production line due to human factors, and the accuracy and stability of the inspection results are low, which cannot meet the efficient and accurate quality control requirements. In addition, the real-time performance of manual inspection method is poor, and it is difficult to provide timely feedback and processing in the production process, which easily causes defective products to flow into the market and affects product quality. CONTENT OF THE INVENTION

[0005] In order to solve the shortcomings of traditional manual detection, realize real-time, efficient and accurate detection of packaging defects in the production process of bagged desiccant, reduce labor cost and improve the overall efficiency of the production line, the present application provides a visual inspection device.

[0006] The visual inspection device provided by the present application adopts the following technical scheme:

[0007] A visual inspection device, comprising a mounting bracket, a detection positioning frame arranged on the mounting bracket, a camera unit, a front light source and a back light source, the detection positioning frame is used to limit the product in the detection area, the front light source and the back light source are respectively located on both sides of the detection positioning frame, and the front light source and the camera unit are arranged on the same side.

[0008] The control unit is further configured to control the on-off of the front light source and the backlight source and adjust the brightness thereof, control the image capturing of the image capturing unit, and receive the image of the image capturing unit in real time to analyze whether the product has defects.

[0009] By adopting the above technical scheme, the device realizes full-automatic product defect detection by automatically controlling the light source and the image capturing unit, avoids omissions and misjudgments in manual inspection, improves the detection efficiency and accuracy, the brightness of the front light source and the backlight source is adjustable, and the front light source and the backlight source can be used alone or in combination as needed, so that the light source conditions can meet the detection requirements in different detection scenarios, thereby improving the accuracy of defect recognition. The visual detection device has strong adaptability, can flexibly adjust the light source configuration and detection mode according to different product types and production needs, is widely applicable to different production scenarios, not only reduces the labor cost, but also improves the overall working efficiency of the production line, avoids the low efficiency and inconsistency caused by manual inspection, and thus improves the product quality.

[0010] In a specific implementable scheme, the front light source is configured for the detection of the size of the appearance of the product, the backlight source is configured for the detection of the ironing of the product, and the front light source and the backlight source are used in cooperation and configured for the detection of the virtual sealing of the hole site, the long and short package, and the color mark deviation of the product.

[0011] In a specific implementable scheme, the image capturing unit includes a plurality of cameras, a plurality of detection channels are arranged on the detection positioning frame, each two detection channels correspond to one camera, and the product enters the corresponding detection area through the detection channel.

[0012] By adopting the above technical scheme, by arranging a plurality of cameras and a plurality of detection channels, a plurality of products can be detected at the same time, parallel operation is realized, the detection efficiency is greatly improved, the detection time is reduced, and the real-time detection requirement of the high-speed production line is met.

[0013] In a specific implementable scheme, the camera is located at the middle position of the two detection channels, and the distance between the camera and the detection positioning frame is 40-80 mm.

[0014] By adopting the above technical scheme, the camera is arranged at the middle position of the two detection channels, and the appropriate distance of 40-80 mm is maintained, so that the camera can obtain the best shooting angle and distance, thereby effectively avoiding image distortion caused by too far or too close, ensuring the image quality, and improving the accuracy of defect detection.

[0015] In one specific implementation, the light emitted by the backlight is projected vertically on the product; the light emitted by the front light is projected obliquely on the product, and the light emitted by the front light is inclined towards the product by 30-50 degrees.

[0016] By adopting the above technical solution, the product can be fully illuminated by reasonable light source configuration (combination of vertical light source and inclined light source), ensuring that different types of defects can be clearly captured. This lighting method reduces misjudgment caused by insufficient or uneven lighting, improving the accuracy and reliability of detection.

[0017] In one specific implementation, the front light is arranged at a height higher than the backlight.

[0018] By adopting the above technical solution, the height of the front light is higher than that of the backlight, so that the light emitted by the front light is more concentrated on the surface of the product, avoiding the interference of the too strong illumination of the backlight, improving the definition of the image, and making the surface details more obvious, especially when detecting surface defects, clearer images can be obtained.

[0019] In one specific implementation, the detection positioning frame is provided with a height adjusting groove, the mounting bracket is provided with a mounting hole, the detection positioning frame is fixed on the mounting bracket by a screw, and the screw is connected and fixed through the height adjusting groove and the mounting hole.

[0020] By adopting the above technical solution, the height of the detection positioning frame can be adjusted by setting the height adjusting groove on the detection positioning frame, and the groove is arranged along the height direction. The operator can adjust the position of the positioning frame according to the actual needs to adapt to different detection requirements or workpiece height requirements. The structure is connected by screws, which is not only easy to install, but also easy to adjust.

[0021] In one specific implementation, the front light is installed on the mounting bracket by a fixing member, the fixing member includes a fixing seat arranged on the mounting bracket and a fixing plate connected with the front light, and the fixing plate is rotatably arranged on the fixing seat.

[0022] By adopting the above technical solution, the direction of the front light can be adjusted as needed by designing the fixing plate rotatably arranged on the fixing seat. By rotating the fixing plate, the illumination angle of the light source can be adjusted to adapt to different lighting requirements or working environments, providing flexible light source adjustment function.

[0023] In one specific implementation, the fixing seat is provided with an angle adjusting groove, the fixing plate is provided with a fixing hole, and the fixing plate is fixed on the fixing seat by a bolt which is connected and fixed with the fixing hole through the angle adjusting groove.

[0024] By adopting the above technical scheme, the angle adjusting groove and the bolt fixing design are used, the position of the fixing plate relative to the fixing seat can be flexibly adjusted by the angle adjusting groove, the flexibility of angle adjustment is provided, the fixing plate is connected with the fixing seat by the bolt, the installation process is simple, and the fixing plate and the light source are stably fixed.

[0025] In one specific implementation, the alarm unit is further included, which is signal connected with the control unit, and is used to issue an alarm when the control unit detects and analyzes that the product has defects.

[0026] By adopting the above technical scheme, when the control unit detects that the product has defects, the alarm unit immediately issues an alarm, avoids that the defective products flow into the market or continue to be used, ensures rapid response and processing, and thus improves product quality control and production efficiency.

[0027] To sum up, the beneficial technical effects of the present application are as follows: the visual detection device automatically controls the light source and the camera unit, realizes full-automatic defect detection, avoids manual misjudgment, improves efficiency and accuracy, has adjustable front light and backlight brightness, supports separate or cooperative use to meet the needs of different detection scenes, and thus improves recognition accuracy; meanwhile, multiple cameras and detection channels support parallel operation, adapt to high-speed production lines, and further improve detection efficiency.

[0028] By reasonable light source layout, the omnidirectional illumination of the product is ensured, and the possibility of misjudgment is reduced; the height of the detection positioning frame is adjustable, which can adapt to the needs of different products, and the angle adjustment function of the front light increases the flexibility of the system; in addition, when defects are found, the alarm unit can respond in time to ensure that problems can be found and processed quickly, thereby improving the control effect of product quality. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a structural schematic view of the visual detection device of the embodiment of the present application.

[0030] Figure 2 is a schematic view for showing the positional relationship of the installation support, the detection positioning frame, the front light and the backlight.

[0031] Figure 3 is a structural schematic view of the alarm unit.

[0032] Explanation of reference signs: 1, mounting bracket; 11, mounting hole; 2, detection positioning frame; 21, detection channel; 22, inlet; 23, outlet; 24, height adjusting groove; 3, camera unit; 31, camera; 4, front light source; 5, back light source; 6, detection area; 7, fixing part; 71, fixing seat; 72, fixing plate; 73, angle adjusting groove; 74, fixing hole; 8, alarm unit; 81, alarm lamp; 82, fixing frame. DETAILED DESCRIPTION

[0033] The following will be described in detail in combination with the accompanying drawings. Figures 1-3 The present application is further described in detail.

[0034] The embodiment of the present application discloses a visual detection device, in the embodiment, the visual detection device includes but is not limited to be applied to quality detection of bagged desiccant, in the production process of the bagged desiccant, the visual detection device can be used for detecting long and short bags, transverse sealing and ironing, punching deviation, virtual sealing, color mark deviation and the like.

[0035] Reference Figure 1 And Figure 2 , the visual detection device includes a mounting bracket 1, the mounting bracket 1 provides overall structural support, and ensures stability during detection; in the embodiment, the visual detection device is detachably mounted on the production equipment of the bagged desiccant through the mounting bracket 1; in the embodiment, the production equipment of the bagged desiccant is a packaging machine, the packaging machine is provided with a transverse sealing mechanism and a punching mechanism, the visual detection device is mounted on the packaging machine through the mounting bracket 1, and the bagged desiccant sequentially passes through the transverse sealing mechanism and the punching mechanism and then enters the visual detection device for detection;

[0036] In the embodiment, the transverse sealing mechanism is composed of a clamping device, a heating plate, a pressing device and a driving system, and the punching mechanism is composed of a punching needle and a transmission system; the bagged desiccants are arranged in a continuous long row mode, the transverse sealing mechanism clamps the bag opening through the movable clamping device, pushes the bag downward to contact the heating plate, completes the sealing and applies pressure to ensure the sealing; after the sealing, the clamping device moves downward to release the bag, and the bag continues to be transmitted to the punching mechanism; during the punching, the punching needle is accurately positioned and operated, and after the completion, the bag continues to be conveyed to the visual detection device, and the whole process is driven by the clamping device to move the whole row of bagged desiccants.

[0037] The visual inspection device further comprises a detection positioning frame 2, a camera unit 3, a front light source 4 and a back light source 5 arranged on the mounting bracket 1. In the embodiment, the detection positioning frame 2, the camera unit 3, the front light source 4 and the back light source 5 are detachably arranged. In the embodiment, the detection positioning frame 2 is used to position the product in the detection area 6. The detection positioning frame 2 can accommodate a plurality of rows of bagged desiccants to be detected. The front light source 4 and the back light source 5 are respectively arranged on the two sides of the detection positioning frame 2. The front light source 4 and the camera unit 3 are arranged on the same side. In the embodiment, the brightness of the front light source 4 and the back light source 5 is adjustable. The front light source 4 is used to illuminate the surface and the edge of the product. The back light source 5 is used to highlight the surface defects through transmission.

[0038] In the embodiment, the light sources used for each detection item are configured differently. Specifically:

[0039] 1. Long and short bags: The edge and the cursor position of the bagged desiccant are found through the front light source 4. Whether the size of the packaging bag is consistent is detected to determine whether there is a long and short bag problem.

[0040] 2. Transverse sealing and fusing: The transverse sealing area of the bagged desiccant is illuminated through the back light source 5. If there is a brightening phenomenon, it means that there is a fusing defect. Whether there is a fusing defect is determined.

[0041] 3. Hole punching deviation: The edge of the bagged desiccant is found through the front light source 4, and the hole center is found through the back light source 5. The distance between the hole center and the upper and lower edges is determined to be 3 mm in absolute value, and the distance between the hole center and the left and right edges is determined to be 3.5 mm in absolute value. Whether there is a hole punching deviation is determined.

[0042] 4. False sealing: The upper and lower edges of the sealing part are found through the cooperation of the front light source 4 and the back light source 5. Whether the upper and lower edges are continuous straight lines is determined to determine whether there is a false sealing problem.

[0043] 5. Color mark deviation: The surface of the bagged desiccant is illuminated through the front light source 4, and the back light source 5 is illuminated through the packaging bag. The position of the color mark is located through an image processing algorithm. The position deviation of the color mark in the image is calculated to determine whether the color mark is deviated. If the position deviation of the color mark exceeds the set tolerance range (for example, the deviation exceeds 2 mm), it is determined that the color mark is deviated.

[0044] In this process, a preset algorithm (such as machine learning and image recognition) can be used to compare the product image with a standard template to determine whether there is a defect or a region that does not meet the specifications.

[0045] In the embodiment, the brightness of the front light source 4 and the backlight source 5 is adjustable, and can be used alone or in combination as needed, to ensure that the light source conditions can meet the detection requirements in different detection scenarios, thereby improving the accuracy of defect identification.

[0046] The visual inspection device further comprises a control unit (not shown in the figure) and an alarm unit 8, the control unit is used to control the opening and closing (lighting or not lighting) of the front light source 4 and the backlight source 5 and adjust the brightness thereof, and the controller can be used alone or in combination as needed, to ensure that the light source conditions can meet the detection requirements in different detection scenarios, thereby improving the accuracy of defect identification; the control unit is also used to control the shooting of the camera unit 3 and receive the images of the camera unit 3 in real time to analyze whether the product has defects, and the process includes but is not limited to image denoising, contrast enhancement, edge detection, feature extraction and other technologies to highlight the possible defects on the surface of the product;

[0047] Referring to Figure 2 and 3 , the alarm unit 8 is signal connected with the control unit, in the embodiment, the alarm unit 8 is composed of alarm lamps 81 and a buzzer (not shown in the figure), the alarm lamps 81 and the buzzer are detachably mounted on the mounting bracket 1 through a fixing frame 82, the alarm lamps 81 are provided in multiple, and the alarm lamps 81 are correspondingly arranged with each column of bagged desiccants to be detected; when the control unit detects that the bagged desiccants have defects, the alarm unit 8 immediately issues an alarm through the alarm lamps 81 and the buzzer, and the alarm lamp 81 corresponding to the column of bagged desiccants having defects is bright; thereby ensuring that once a problem is found in the production or use of the bagged desiccants, relevant personnel can be notified in time, to avoid the defective products from flowing into the market or continuing to be used, to ensure rapid response and processing, thereby improving product quality control and production efficiency.

[0048] When working, first, the bagged desiccants to be detected are placed in the detection positioning frame 2, to ensure accurate positioning in the detection area 6, then the light intensity of the front light source 4 and the backlight source 5 is adjusted by the control unit, and appropriate light source configuration (the front light source 4, the backlight source 5 or both are used in combination) is selected to meet different detection requirements; the control unit further controls the camera unit 3 to shoot and obtain real-time images of the product, then the image data of the camera unit 3 is transmitted to the control unit, the system analyzes the images in real time to identify whether the product has defects, if there are defects, the control unit transmits a signal to the alarm unit 8, and the alarm unit 8 immediately issues an alarm to notify relevant personnel; the device realizes fully automated product defect detection by automatically controlling the light source, the camera unit 3 and the alarm unit 8, avoids omissions and misjudgments in manual inspection, and improves the detection efficiency and accuracy;

[0049] The visual detection device has strong adaptability, can flexibly adjust the light source configuration and detection mode according to different product types and production needs, is widely applicable to different production scenes, through automatic detection, not only reduces the labor cost, but also improves the overall working efficiency of the production line, avoids the inefficiency and inconsistency caused by manual inspection, and improves the product quality.

[0050] Reference Figure 1 and Figure 2 In the embodiment, the camera unit 3 includes a plurality of cameras 31, and the detection positioning frame 2 is provided with a plurality of detection channels 21 (dashed lines in the figure). Figure 1 In the embodiment, the detection channels 21 are arranged along the height direction, and each detection channel 21 is composed of an inlet 22 and an outlet 23. After the bagged desiccant is punched, it enters the detection channel 21 through the inlet 22 to enter the corresponding detection area 6 in the detection positioning frame 2, and then moves to the next process through the outlet 23 after the detection is completed;

[0051] The plurality of cameras 31 are arranged along the length direction of the detection positioning frame 2, and each two detection channels 21 correspond to one camera 31. The camera 31 is located at the middle position of the two detection channels 21. The layout of the camera 31 at the middle position can uniformly cover the products of the two detection channels 21. The distance between the camera 31 and the detection positioning frame 2 is 40-80mm, and in the embodiment, the distance between the camera 31 and the detection positioning frame 2 is preferably 45-50mm. This distance can ensure that the camera 31 obtains the best shooting angle and distance, thereby avoiding image distortion caused by being too far or too close, ensuring image quality and improving the accuracy of defect detection;

[0052] By arranging a plurality of cameras 31 and detection channels 21, the system can simultaneously detect a plurality of products in parallel, significantly improving the detection efficiency and reducing the detection time, and is suitable for real-time detection requirements of high-speed production lines. At the same time, the detection channel 21 can be adjusted according to the product size and shape to ensure that each product can pass through the appropriate detection area 6 and meet the needs of different production lines.

[0053] The detection positioning frame 2 is provided with a height adjusting groove 24 arranged along the height direction, and the mounting bracket 1 is provided with a mounting hole 11. The detection positioning frame 2 is fixed on the mounting bracket 1 by screws (not shown in the figure). The screws pass through the height adjusting groove 24 and are connected and fixed with the mounting hole 11. Through screw connection, not only the installation is simple, but also the adjustment is convenient. The worker can quickly adjust the height, and at the same time, without complex tools or processes, the maintenance and adjustment are more efficient;

[0054] During installation, the height of the detection positioning frame 2 is adjusted according to actual needs, after adjustment, a screw is used to connect the height adjustment slot 24 on the detection positioning frame 2 and the mounting hole 11 on the mounting bracket 1, to ensure that the positioning frame is stably fixed on the mounting bracket 1; by providing the height adjustment slot 24 on the detection positioning frame 2, the height adjustment of the detection positioning frame 2 can be realized, and the position of the positioning frame can be adjusted by the operator according to actual needs, to adapt to different detection requirements or workpiece height requirements.

[0055] In the embodiment, the setting height of the front light source 4 is higher than that of the back light source 5; the setting height of the front light source 4 is higher than that of the back light source 5, so that the light emitted by the front light source 4 is more concentrated on the product surface, avoiding the interference of the too strong illumination of the back light source 5, improving the definition of the image, and making the surface details more obvious, especially when detecting surface defects, clearer images can be obtained.

[0056] In the embodiment, the light emitted by the back light source 5 is vertically projected on the product, and the vertical illumination mode of the back light source 5 can help to enhance the outline and geometric features of the product, clearly display the shape and edge of the product, and is especially suitable for detecting the shape defects of the product; the light emitted by the front light source 4 is obliquely projected on the product, and the light emitted by the front light source 4 is inclined to the product by 30°-50° (the inclination angle of the light to the product can be referred to the A angle shown in the attached Figure 2 In the embodiment, preferably, the light emitted by the front light source 4 is inclined to the product by 45°, and the inclined illumination of the front light source 4 produces a shadow effect, which can highlight the details and defects of the product surface, and the shadow can help to detect small surface defects and improve the detection accuracy.

[0057] The front light source 4 is installed on the mounting bracket 1 through the fixing part 7, the fixing part 7 includes a fixing seat 71 provided on the mounting bracket 1 and a fixing plate 72 connected with the front light source 4, and the fixing plate 72 is rotatably provided on the fixing seat 71; wherein the fixing seat 71 is provided with an angle adjustment slot 73, and the fixing plate 72 is provided with a fixing hole 74, and the fixing plate 72 is fixed on the fixing seat 71 through a bolt (not shown in the figure), and the bolt is connected and fixed through the angle adjustment slot 73 and the fixing hole 74 to fix the fixing plate 72;

[0058] During installation, the installation angle of the front light source 4 is adjusted according to actual needs, the angle of the front light source 4 is adjusted by rotating the fixing plate 72, after the angle of the front light source 4 is adjusted, the bolt is fixed through the angle adjustment slot 73 and the fixing hole 74, to ensure the stable connection between the fixing plate 72 and the fixing seat 71, and the front light source 4 remains at the required angle; so that the system can accurately adjust the illumination angle of the light source according to the different shapes of the detected object and the detection requirements, adapt to different working scenes and detection requirements, not only improve the flexibility of the equipment, but also meet the lighting requirements of different products or environments, increase the versatility of the equipment.

[0059] The implementation principle of the embodiment of the application is that after the bagged desiccant completes the horizontal sealing and punching operation, the bagged desiccant is driven to move to the visual detection device by the clamping device, enters the detection channel 21 through the inlet 22, and enters the corresponding detection area 6 in the detection positioning frame 2; the control unit adjusts the brightness of the front light source 4 and the back light source 5 according to the detection requirement, and selects a suitable light source configuration, so that the defects of the product can be clearly displayed during the detection process;

[0060] After the camera unit 3 receives the instruction of the control unit, the camera 31 is started, the image of the bagged desiccant is shot, and the captured image signal is converted into digital data and transmitted to the control unit for processing; the control unit analyzes the captured image data in real time, compares the product image with the standard template through a preset algorithm, judges whether there is a defect or an area that does not meet the specifications, and if a defect is detected, the control unit triggers the alarm unit 8 to issue an alarm to remind the operator that the product has a problem;

[0061] The application can efficiently and accurately identify product defects by flexibly configuring the front light source 4 and the back light source 5 with adjustable brightness, and combining the control unit and the alarm unit 8, thereby improving the accuracy and efficiency of detection; the multi-camera 31 system and the adjustable detection channel 21 make the device have strong adaptability, can cope with products of different sizes and shapes, reduce the error and time of manual inspection, and at the same time improve the automation degree of the production line, reduce the cost, and improve the product quality.

[0062] The above are preferred embodiments of the application, and do not limit the protection scope of the application, therefore: any equivalent changes made according to the structure, shape, principle of the application should be covered within the protection scope of the application.

Claims

1. A visual inspection device, characterized in that: The device includes a mounting bracket (1), a detection positioning frame (2) mounted on the mounting bracket (1), a camera unit (3), a front light source (4), and a back light source (5). The detection positioning frame (2) is used to limit the product within the detection area (6). The front light source (4) and the back light source (5) are located on opposite sides of the detection positioning frame (2). The front light source (4) and the camera unit (3) are located on the same side. It also includes a control unit, which is used to control the opening and closing of the front light source (4) and the back light source (5) and adjust their brightness; it is also used to control the camera unit (3) to take pictures and receive the images from the camera unit (3) in real time to analyze whether the product has defects.

2. The visual inspection device according to claim 1, characterized in that: The positive light source (4) is configured for detecting the product's appearance dimensions; the backlight source (5) is configured for detecting product heat fading; the positive light source (4) and the backlight source (5) are used together and configured for detecting holes, false seals, long and short packages, and color mark offsets on the product.

3. The visual inspection device according to claim 1, characterized in that: The camera unit (3) includes several cameras (31), and the detection positioning frame (2) is provided with several detection channels (21). Each pair of detection channels (21) corresponds to one camera (31). The product enters the corresponding detection area (6) through the detection channel (21).

4. The visual inspection device according to claim 3, characterized in that: The camera (31) is located in the middle of the two detection channels (21), and the distance between the camera (31) and the detection positioning frame (2) is 40-80mm.

5. The visual inspection device according to claim 1, characterized in that: The detection positioning frame (2) is provided with a height adjustment groove (24), and the mounting bracket (1) is provided with a mounting hole (11). The detection positioning frame (2) is fixed on the mounting bracket (1) by screws, and the screws pass through the height adjustment groove (24) and are connected and fixed to the mounting hole (11).

6. The visual inspection device according to claim 1, characterized in that: The light emitted by the backlight (5) is projected vertically onto the product; the light emitted by the front light source (4) is projected obliquely onto the product, and the light emitted by the front light source (4) is tilted towards the product at a 30°-50° angle.

7. The visual inspection device according to claim 5, characterized in that: The height of the positive light source (4) is higher than the height of the back light source (5).

8. The visual inspection device according to claim 6, characterized in that: The positive light source (4) is mounted on the mounting bracket (1) by a fixing member (7). The fixing member (7) includes a fixing seat (71) provided on the mounting bracket (1) and a fixing plate (72) connected to the positive light source (4). The fixing plate (72) is rotatably mounted on the fixing seat (71).

9. The visual inspection device according to claim 8, characterized in that: The fixed base (71) is provided with an angle adjustment groove (73), and the fixed plate (72) is provided with a fixing hole (74). The fixed plate (72) is fixed to the fixed base (71) by bolts, and the bolts pass through the angle adjustment groove (73) and are connected and fixed to the fixing hole (74).

10. The visual inspection device according to claim 1, characterized in that: It also includes an alarm unit (8), which is connected to the control unit and is used to issue an alarm when the control unit detects and analyzes that the product has a defect.

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