Shell product pressing method and system based on visual inspection

Abstract

The present invention relates to the technical fields of electrical equipment shell manufacturing, visual inspection, data recognition, etc., and provides a shell product pressing method and system based on visual inspection. After loading, a visual inspection component is controlled to shoot a product jig on which a shell product is placed to obtain a product placement image, and the alignment state of the shell product and the product jig in the product placement image is analyzed. When the alignment of the shell product and the product jig is accurate, a pressing mechanism is controlled to move to the top of a pressing station, and the shell product is pressed down and then reset. The visual inspection component is controlled to shoot the shell product after pressing on the product jig to obtain a product pressing image, and the pressing state of the shell product is analyzed. When the pressing state of the shell product is qualified, a material unloading suction cup mechanism arranged on the side of the pressing station is controlled to unload the shell product with the qualified pressing state, thereby improving the production efficiency of the shell product, improving the quality stability of the shell product, and reducing the inspection cost.

Description

Technical Field

[0001] The present invention relates to the technical fields of electrical equipment housing manufacturing, visual inspection, data recognition, and the like, and in particular to a housing product pressing method and system based on visual inspection. Background Art

[0002] In the shell production process of electronic devices such as mobile phones, the shell pressing process of pressing the shell substrate and the shell accessories is often involved. For example, the shell substrate is pressed with a flexible material (such as silicone or rubber), the shell substrate is pressed with a shell diaphragm, and the shell substrate is pressed with parts (such as buttons, decorative strips). In the prior art, the shell pressing process mainly includes the following processes: shell product transmission, photoelectric sensor in-position detection, shell product loading, pressing of the pressing mechanism, unloading of the unloading mechanism (such as suction cups, robotic arms, etc.), and manual detection of the pressing state. When the photoelectric sensor in-position detection mechanism detects that the shell product is in place, the product in-position information is transmitted to the main control module. After obtaining the product in-position information, the main control module controls the shell product loading mechanism (such as suction cups, robotic arms, etc.) to take the shell product to the pressing station for pressing. After the product is conveyed and placed, the shell product placed in the pressing station may be offset, resulting in the product being pressed unqualified. In addition, improper pressing parameters such as pressing force and time may also result in the product being pressed unqualified. Therefore, after the unloading mechanism unloads the material, it is necessary to manually check whether the pressing state of the shell product is qualified. Manual inspection is inefficient, costly, and lacks objective and unified judgment, which is not conducive to the stability control of product quality.

[0003] In summary, the existing production technology of shell products has technical problems such as low efficiency, high cost, lack of objective and unified judgment, and is not conducive to the stability control of product quality. Summary of the invention

[0004] In view of the deficiencies in the above-mentioned prior art, the present invention provides a shell product pressing method and system based on visual inspection, so as to improve the production efficiency of shell products, improve the quality stability of shell products, and reduce the inspection cost.

[0005] In a first aspect, the present invention provides a shell product pressing method based on visual inspection, comprising:

[0006] After the product conveying mechanism conveys the shell product to the loading station, the loading suction cup mechanism arranged on the side of the loading station is controlled to suck the shell product and place it on the product jig of the pressing station;

[0007] After detecting that the feeding suction cup mechanism is reset to the side of the feeding station, controlling the visual detection component arranged above the pressing station to shoot the product jig on which the shell product is placed, so as to obtain a product placement image, wherein the product placement image reflects the alignment state of the shell product on the product jig;

[0008] Analyze the alignment state of the shell product and the product jig in the product placement image, and when the alignment of the shell product and the product jig is accurate, control the pressing mechanism provided on the side of the pressing station to move to the top of the pressing station, press down the shell product and then reset it to the side of the pressing station;

[0009] After detecting that the pressing mechanism is reset to the side of the pressing station, controlling the visual inspection component to shoot the shell product pressed on the product jig to obtain a product pressing image, wherein the product pressing image reflects the pressing state of the shell product;

[0010] The pressing state of the shell product is analyzed, and when the pressing state of the shell product is qualified, the unloading suction cup mechanism arranged at the side of the pressing station is controlled to unload the shell product with the qualified pressing state.

[0011] In a second aspect, the present invention provides a housing product pressing system based on visual inspection, comprising:

[0012] Control the host and run the shell product pressing method based on visual inspection;

[0013] A product conveying mechanism is connected and communicated with the control host, works under the control of the control host, and conveys the shell product to the loading station;

[0014] A feeding suction cup mechanism is arranged at the side of the feeding station, is connected and communicated with the control host, works under the control of the control host, and sucks the shell product to place it on the product jig of the pressing station;

[0015] A visual inspection component is arranged above the pressing station, connected to and communicated with the control host, and works under the control of the control host to photograph the product jig on which the shell product is placed to obtain a product placement image;

[0016] A pressing mechanism is arranged at the side of the pressing station, connected to and communicated with the control host, works under the control of the control host, moves to the top of the pressing station, presses down the shell product and then returns to the side of the pressing station;

[0017] The unloading suction cup mechanism is arranged at the side of the pressing station, is connected and communicated with the control host, works under the control of the control host, and unloads the shell product in a qualified pressing state.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention provides a shell product pressing method and system based on visual inspection. After a product conveying mechanism conveys a shell product to a loading station, a loading suction cup mechanism arranged at the side of the loading station is controlled to suck up the shell product and place it on a product jig at the pressing station. After detecting that the loading suction cup mechanism is reset to the side of the loading station, a visual inspection component arranged above the pressing station is controlled to shoot the product jig on which the shell product is placed, so as to obtain a product placement image. The product placement image reflects the alignment state of the shell product on the product jig. The alignment state of the shell product and the product jig in the product placement image is analyzed. When the pressing state of the shell product is qualified, the unloading suction cup mechanism arranged on the side of the pressing station is controlled to unload the shell product with the qualified pressing state, thereby improving the production efficiency of the shell product, improving the quality stability of the shell product and reducing the detection cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their description are used to explain the present invention and do not constitute an improper limitation of the present invention. Some specific embodiments of the present invention will be described in detail in an exemplary and non-restrictive manner with reference to the drawings. The same reference numerals in the drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the drawings:

[0021] Figure 1 It is a schematic diagram of a process of a shell product pressing method based on visual inspection according to an embodiment of the present invention;

[0022] Figure 2 It is a schematic diagram of the architecture of a shell product pressing system based on visual inspection according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only an embodiment of a part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0024] Embodiment 1

[0025] See also Figure 1-Figure 2 This embodiment provides a shell product pressing method based on visual inspection, including the following steps:

[0026] S101, after the product conveying mechanism conveys the shell product to the loading station, controlling the loading suction cup mechanism provided on the side of the loading station to suck the shell product and place it on the product jig of the pressing station;

[0027] S102, after detecting that the feeding suction cup mechanism is reset to the side of the feeding station, controlling the visual inspection component disposed above the pressing station to photograph the product jig on which the shell product is placed, so as to obtain a product placement image, wherein the product placement image reflects the alignment state of the shell product on the product jig;

[0028] S103, analyzing the alignment state of the shell product and the product jig in the product placement image, and when the alignment of the shell product and the product jig is accurate, controlling the pressing mechanism provided on the side of the pressing station to move to the top of the pressing station, pressing down the shell product and then returning it to the side of the pressing station;

[0029] S104, after detecting that the pressing mechanism is reset to the side of the pressing station, controlling the visual inspection component to photograph the shell product pressed on the product jig to obtain a product pressing image, wherein the product pressing image reflects the pressing state of the shell product;

[0030] S105, analyzing the pressing state of the shell product, and when the pressing state of the shell product is qualified, controlling the unloading suction cup mechanism provided at the side of the pressing station to unload the shell product with the qualified pressing state.

[0031] It should be noted that, in the present embodiment, after the shell product is conveyed to the loading station by the product conveying mechanism, the loading suction cup mechanism arranged on the side of the loading station is controlled to suck up the shell product and place it on the product jig of the pressing station; after detecting that the loading suction cup mechanism is reset to the side of the loading station, the visual inspection component arranged above the pressing station is controlled to shoot the product jig on which the shell product is placed to obtain a product placement image, wherein the product placement image reflects the alignment state of the shell product on the product jig; the alignment state of the shell product and the product jig in the product placement image is analyzed; and when the alignment of the shell product and the product jig is accurate, the visual inspection component is controlled to shoot the product jig on which the shell product is placed. The pressing mechanism arranged on the side of the pressing station moves to the top of the pressing station, presses down the shell product and then resets to the side of the pressing station. After detecting that the pressing mechanism resets to the side of the pressing station, the visual inspection component is controlled to shoot the shell product after pressing on the product fixture to obtain a product pressing image. The product pressing image reflects the pressing state of the shell product, analyzes the pressing state of the shell product, and when the pressing state of the shell product is qualified, the unloading suction cup mechanism arranged on the side of the pressing station is controlled to unload the shell product with qualified pressing state, thereby improving the production efficiency of the shell product, improving the quality stability of the shell product, and reducing the inspection cost.

[0032] In step S101, the shell product is accurately transferred to the loading station by the conveying mechanism, and the loading suction cup mechanism is used to move the product to the product fixture of the pressing station, so as to ensure that the shell product can be automatically and accurately placed in the designated position, reduce manual operation errors, and improve production efficiency. In step S102, after the loading suction cup mechanism completes the product placement, the alignment image of the product is photographed by the visual inspection component, and it can be monitored in real time whether the shell product is correctly placed on the fixture, so as to ensure that possible alignment problems are found in advance before the product enters the pressing, and prevent the subsequent steps from having poor pressing. In step S103, the alignment state of the shell product and the product fixture in the product placement image is analyzed. When the alignment of the shell product and the product fixture is accurate, the pressing mechanism is controlled to move to the top of the pressing station, and the shell product is pressed down and reset to the side of the pressing station. The alignment state of the product is ensured by visual inspection. Only when the alignment is accurate will the pressing action be triggered, thereby avoiding product defects caused by poor alignment, ensuring the accuracy of product pressing, and reducing the rework rate. In step S104, after detecting that the pressing mechanism is reset to the side of the pressing station, the visual inspection component is controlled to shoot the shell product pressed on the product fixture to obtain the product pressing image, and the pressing quality is monitored in real time to ensure that the pressing quality of the product meets the requirements. If the pressing is poor, it can be discovered and processed in time to improve the yield rate. In step S105, by performing quality analysis on the pressed product, the unloading operation will be performed only when the pressing state is qualified, ensuring that the products flowing into the next link are of qualified quality.

[0033] In some preferred embodiments, a product alignment mark is provided on the product jig, and when analyzing the alignment status of the shell product and the product jig in the product placement image, the alignment of the shell product and the product jig is determined according to the product alignment mark. Further, the product alignment mark includes a product upper edge alignment mark, a product lower edge alignment mark, a product left edge alignment mark, and a product right edge alignment mark; in the product placement image, when the product upper edge alignment mark, the product lower edge alignment mark, the product left edge alignment mark, and the product right edge alignment mark are all covered by the edge of the shell product, it is determined that the alignment of the shell product and the product jig is accurate. Further, when any one of the edge alignment marks among the product upper edge alignment mark, the product lower edge alignment mark, the product left edge alignment mark, and the product right edge alignment mark is not covered by the edge of the shell product, it is determined that the alignment of the shell product and the product jig is offset. It should be noted that in this embodiment, by setting clear alignment marks (four edge alignment marks of top, bottom, left and right) on the product fixture, a clear reference point is provided for visual inspection, and the placement position of the shell product can be judged more accurately, thereby improving the accuracy of alignment. Visual inspection can quickly and accurately determine whether the product is in the correct alignment state by the coverage of these marks. By calculating whether the alignment mark is covered by the edge of the product, the detection error caused by changes in the shape or other characteristics of the product can be reduced. Simple and clear judgment conditions (i.e., alignment is accurate when all four edge marks are covered) reduce the potential errors caused by complex image analysis. It should be noted that in industrial production, there may be various interference factors, such as light changes, product color changes, etc., which will affect the judgment of visual inspection. If alignment detection is performed only relying on the characteristics of the product itself, it may be interfered by these factors. By setting fixed alignment marks, the robustness of visual inspection can be enhanced, the influence of external factors on alignment judgment can be reduced, and the reliability and stability of the detection results can be ensured. In addition, in this embodiment, through a simple covering relationship (i.e., whether the mark is covered), the alignment judgment can be quickly realized, the image processing speed can be accelerated, and the efficiency of the overall production line can be improved. When it is detected that any edge alignment mark is not covered by the edge of the shell product, it is judged that the alignment offset occurs, which is convenient for timely adjustment and correction, which helps to prevent product defects in subsequent steps and improve the quality control of the production process.

[0034] In some preferred embodiments, when the pressing state of the shell product is unqualified, the unloading suction cup mechanism arranged on the side of the pressing station is controlled to take away the shell product with unqualified pressing state and place it in the defective product recovery and processing area for further processing. It should be noted that in this embodiment, by immediately removing the products with unqualified pressing state from the production line and placing them in the defective product recovery and processing area, it can be ensured that only qualified products enter the subsequent production or assembly links, avoiding unqualified products from entering the market or being used for subsequent assembly, and improving the overall quality of the final product. In addition, the unqualified products are placed in the defective product recovery and processing area for subsequent inspection and analysis. The unqualified products can be reworked, disassembled or scrapped through special processes, thereby reducing production losses and providing data support for quality improvement.

[0035] In some preferred embodiments, the unqualified pressing state of the shell product includes the shell accessory's pressing position deviation on the shell substrate surface, the edge of the shell accessory warping on the shell substrate surface, or the adhesive adhering the shell accessory and the shell substrate overflowing to the surface of the shell substrate. It should be noted that the deviation of the pressing position, the warping of the edge of the accessory, the overflow of the adhesive, etc., will significantly affect the visual effect and touch of the product. If these unqualified situations are not controlled, they will lead to poor product appearance, which will in turn affect the user's experience and the market competitiveness of the product. Therefore, defining these situations as unqualified pressing states can strictly control the appearance quality of the product and ensure that it meets the design standards. In addition, the shell product not only requires a good appearance, but also needs to have good functionality. For example, the position deviation of the accessory may cause some functions of the product to fail to be realized normally; the warping of the edge may affect the sealing or durability of the product; the adhesive overflow may affect the normal operation or installation accuracy of the electronic components. Therefore, by identifying these unqualified situations, the reliability and functionality of the product in use can be effectively guaranteed.

[0036] In a further preferred embodiment, when analyzing the pressing state of the shell product, it includes: using the Canny edge detection algorithm to detect the edge of the shell accessory in the product pressing image, extracting the boundary line between the shell accessory and the shell substrate, and using the findContours function in OpenCV to extract the contour line of the shell accessory from the boundary line between the shell accessory and the shell substrate to obtain the shape and position data of the shell accessory; comparing the shape and position of the shell accessory with a preset pressing reference shape and position, when the shape and position of the shell accessory are inconsistent with the preset pressing reference shape and position, the pressing position offset of the shell accessory on the surface of the shell substrate is obtained; comparing the continuity feature and the curvature feature of the contour line of the shell accessory with the preset normal shell accessory edge feature, when the continuity feature and the curvature feature do not match the normal shell accessory edge feature, it is obtained that the edge of the shell accessory is warped on the surface of the shell substrate; analyzing the boundary line feature between the shell accessory and the shell substrate, when the boundary line between the shell accessory and the shell substrate is blurred, the boundary line is widened, or an additional boundary appears, it is obtained that the adhesive adhering the shell accessory and the shell substrate overflows to the surface of the shell substrate. It should be noted that, in this embodiment, the Canny edge detection algorithm is used to detect the edge of the shell accessory, the boundary line is extracted, and then the contour line is extracted by the findContours function, so as to provide the boundary and overall shape information of the shell accessory, and provide a basis for subsequent analysis. Among them, the boundary line provides the edge details of the shell accessory, and the contour line summarizes the overall shape of the shell accessory. The extraction of the boundary line and the contour line enables the shape and position of the accessory to be accurately defined in the image, which provides the necessary data for the subsequent lamination position offset, edge warping and adhesive overflow detection. In addition, by comparing the shape and position of the shell accessory with the preset lamination reference shape and position, the lamination position offset of the shell accessory on the surface of the shell substrate can be detected. Position offset may lead to poor product function or appearance defects, so the shape and position data are compared to determine whether there is an offset, and by comparing the actual position and the reference position, by comparing the actual shape and the reference shape, the direction and degree of the offset can be accurately quantified, and specific correction information can be provided to help improve the accuracy of the lamination process. In addition, edge warping usually causes the continuity of the contour line to be interrupted or the curvature is abnormal. By comparing these features of the contour line with the preset normal edge features, it can be identified whether the edge has a warping phenomenon. Among them, curvature and continuity features are important indicators for determining whether the edge is smooth. If these indicators do not match the normal situation, the location and severity of the warping can be accurately located. In addition, adhesive overflow usually causes the boundary between the shell accessories and the substrate to be blurred, widened, or generate additional boundaries. These features can be detected by analyzing the boundary line.By analyzing the boundary features, the problem of glue overflow can be detected efficiently and accurately, the error of manual detection can be avoided, and the automation level and quality control ability of the production line can be improved. It can be understood that the Canny edge detection algorithm is a classic and widely used edge detection algorithm in the field of computer vision, developed by John F. Canny in 1986. The main purpose of the algorithm is to detect significant edges in an image, and the edges usually represent areas with large intensity changes in the image, that is, the contours or boundaries of objects. In this embodiment, the function of the Canny edge detection algorithm is to detect the edge between the shell accessories and the shell substrate from the product pressing image. By identifying significant changes in pixel intensity in the image, the Canny edge detection algorithm can accurately extract the contours of the shell accessories and the boundary lines of the substrate, providing basic data for subsequent contour extraction and analysis. The findContours function is a function in the OpenCV library that is used to extract contours from a binary image (e.g., an image processed by edge detection). The contour refers to a set of edge points connected together.

[0037] In some further preferred embodiments, when the edge of the shell accessory warps on the surface of the shell substrate or the glue of the shell accessory and the shell substrate overflows onto the surface of the shell substrate, the abnormal pressing time and abnormal pressure value of the pressing mechanism under the warping or glue overflow state are obtained, and the abnormal pressing time and abnormal pressure value are stopped to press the current batch of shell products; sample shell products are randomly sampled from the current batch of shell products, and the abnormal pressing time and abnormal pressure value are adjusted to press the sample shell products until the normal pressing time and pressure value are obtained when the warping or glue overflow state in the sample shell product disappears. It should be noted that in this embodiment, when the edge of the shell accessory is detected to be warped or the glue overflows, it means that the current pressing time or pressure parameters have deviated from the reasonable range, resulting in product quality problems. By monitoring these parameters in real time and marking them as "abnormal", production can be stopped in time to avoid continuing to use these parameters to press subsequent products, thereby preventing the production of a large number of defective products. By quickly identifying abnormal parameters and stopping production, the entire batch of products can be prevented from being scrapped due to the same quality problem, thereby reducing the scrap rate and production costs. After a problem occurs, by adjusting the parameters through random sampling of the current batch of products, rather than blindly adjusting the parameters of the entire production line, the appropriate pressing time and pressure value can be quickly found under the premise of controlling costs, avoiding unnecessary waste caused by large-scale adjustments. By testing and adjusting the sample shell products, the pressing time and pressure value are gradually optimized until the warping or adhesive overflow problem disappears, thus achieving dynamic adjustment, ensuring the continuous optimization of production parameters, and making the subsequent production process more stable and efficient.

[0038] It should be noted that in the above embodiments, the housing accessory may include a housing film for laminating with the surface of the housing substrate, and the housing film is printed with a decorative design. Further, the housing film includes: a polyolefin decorative film and a polyethylene terephthalate copolymer decorative film.

[0039] Embodiment 2

[0040] See also Figure 1-Figure 2 This embodiment provides a shell product pressing system based on visual inspection, including:

[0041] Controlling the host to execute the housing product pressing method based on visual inspection described in any of the above embodiments;

[0042] A product conveying mechanism is connected and communicated with the control host, works under the control of the control host, and conveys the shell product to the loading station;

[0043] A feeding suction cup mechanism is arranged at the side of the feeding station, is connected and communicated with the control host, works under the control of the control host, and sucks the shell product to place it on the product jig of the pressing station;

[0044] A visual inspection component is arranged above the pressing station, connected to and communicated with the control host, and works under the control of the control host to photograph the product jig on which the shell product is placed to obtain a product placement image;

[0045] A pressing mechanism is arranged at the side of the pressing station, connected to and communicated with the control host, works under the control of the control host, moves to the top of the pressing station, presses down the shell product and then returns to the side of the pressing station;

[0046] The unloading suction cup mechanism is arranged at the side of the pressing station, is connected and communicated with the control host, works under the control of the control host, and unloads the shell product in a qualified pressing state.

[0047] It should be noted that, in the present embodiment, after the shell product is conveyed to the loading station by the product conveying mechanism, the loading suction cup mechanism arranged on the side of the loading station is controlled to suck up the shell product and place it on the product jig of the pressing station; after detecting that the loading suction cup mechanism is reset to the side of the loading station, the visual inspection component arranged above the pressing station is controlled to shoot the product jig on which the shell product is placed to obtain a product placement image, wherein the product placement image reflects the alignment state of the shell product on the product jig; the alignment state of the shell product and the product jig in the product placement image is analyzed; and when the alignment of the shell product and the product jig is accurate, the visual inspection component is controlled to shoot the product jig on which the shell product is placed. The pressing mechanism arranged on the side of the pressing station moves to the top of the pressing station, presses down the shell product and then resets to the side of the pressing station. After detecting that the pressing mechanism resets to the side of the pressing station, the visual inspection component is controlled to shoot the shell product after pressing on the product fixture to obtain a product pressing image. The product pressing image reflects the pressing state of the shell product, analyzes the pressing state of the shell product, and when the pressing state of the shell product is qualified, the unloading suction cup mechanism arranged on the side of the pressing station is controlled to unload the shell product with qualified pressing state, thereby improving the production efficiency of the shell product, improving the quality stability of the shell product, and reducing the inspection cost.

[0048] The above embodiments are only preferred specific implementation modes of the present invention, and the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. The protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A shell product pressing method based on visual inspection, characterized in that: include: After the product conveying mechanism conveys the shell product to the loading station, the loading suction cup mechanism arranged on the side of the loading station is controlled to suck the shell product and place it on the product jig of the pressing station; After detecting that the feeding suction cup mechanism is reset to the side of the feeding station, controlling the visual detection component arranged above the pressing station to shoot the product jig on which the shell product is placed, so as to obtain a product placement image, wherein the product placement image reflects the alignment state of the shell product on the product jig; Analyze the alignment state of the shell product and the product jig in the product placement image, and when the alignment of the shell product and the product jig is accurate, control the pressing mechanism provided on the side of the pressing station to move to the top of the pressing station, press down the shell product and then reset it to the side of the pressing station; After detecting that the pressing mechanism is reset to the side of the pressing station, controlling the visual inspection component to shoot the shell product pressed on the product jig to obtain a product pressing image, wherein the product pressing image reflects the pressing state of the shell product; Analyze the pressing state of the shell product, and when the pressing state of the shell product is qualified, control the unloading suction cup mechanism provided on the side of the pressing station to unload the shell product with the qualified pressing state; When the pressing state of the shell product is unqualified, the unloading suction cup mechanism arranged at the side of the pressing station is controlled to take away the shell product with unqualified pressing state and place it in the defective product recovery and processing area for further processing; the unqualified pressing state of the shell product includes the pressing position deviation of the shell accessory on the surface of the shell substrate, the edge of the shell accessory is warped on the surface of the shell substrate, or the adhesive of the shell accessory and the shell substrate overflows to the surface of the shell substrate; When analyzing the pressing state of the shell product, the method includes: using the Canny edge detection algorithm to detect the edge of the shell accessory in the pressed image of the product, extracting the boundary line between the shell accessory and the shell substrate, and using the findContours function in OpenCV to extract the contour line of the shell accessory from the boundary line between the shell accessory and the shell substrate to obtain the shape and position data of the shell accessory; comparing the shape and position of the shell accessory with a preset pressing reference shape and position, when the shape and position of the shell accessory are inconsistent with the preset pressing reference shape and position, obtaining the pressing position offset of the shell accessory on the surface of the shell substrate; comparing the continuity feature and the curvature feature of the contour line of the shell accessory with the preset normal shell accessory edge feature, when the continuity feature and the curvature feature do not match the normal shell accessory edge feature, obtaining the edge of the shell accessory is warped on the surface of the shell substrate; analyzing the boundary line feature between the shell accessory and the shell substrate, when the boundary line between the shell accessory and the shell substrate is blurred, the boundary line is widened, or an additional boundary appears, obtaining the adhesive adhering the shell accessory and the shell substrate overflows to the surface of the shell substrate.

2. The shell product pressing method based on visual inspection according to claim 1, characterized in that: When the alignment between the shell product and the product jig is offset, a prompt is provided to adjust the alignment between the shell product and the product jig so as to make the alignment between the shell product and the product jig accurate.

3. The shell product pressing method based on visual inspection according to claim 1, characterized in that: The product jig is provided with a product alignment mark, and when analyzing the alignment state of the shell product and the product jig in the product placement image, the alignment of the shell product and the product jig is determined according to the product alignment mark.

4. The shell product pressing method based on visual inspection according to claim 3 is characterized in that: The product alignment mark includes a product upper edge alignment mark, a product lower edge alignment mark, a product left edge alignment mark and a product right edge alignment mark; in the product placement image, when the product upper edge alignment mark, the product lower edge alignment mark, the product left edge alignment mark and the product right edge alignment mark are all covered by the edge of the shell product, it is determined that the shell product and the product fixture are accurately aligned.

5. The shell product pressing method based on visual inspection according to claim 4 is characterized in that: When any one of the product upper edge alignment mark, the product lower edge alignment mark, the product left edge alignment mark and the product right edge alignment mark is not covered by the edge of the shell product, the alignment offset between the shell product and the product fixture is determined.

6. The shell product pressing method based on visual inspection according to claim 1, characterized in that: The housing accessory comprises a housing membrane for pressing with the surface of the housing substrate, and the housing membrane is printed with a decorative design.

7. The housing product pressing method based on visual inspection according to claim 6, characterized in that: The shell film includes: a polyolefin decorative film and a polyethylene terephthalate copolymer decorative film.

8. A shell product pressing system based on visual inspection, characterized in that: include: Controlling the host to run the shell product pressing method based on visual inspection as described in any one of claims 1 to 7; A product conveying mechanism is connected and communicated with the control host, works under the control of the control host, and conveys the shell product to the loading station; A feeding suction cup mechanism is arranged at the side of the feeding station, is connected and communicated with the control host, works under the control of the control host, and sucks the shell product to place it on the product jig of the pressing station; A visual inspection component is arranged above the pressing station, connected to and communicated with the control host, and works under the control of the control host to photograph the product jig on which the shell product is placed to obtain a product placement image; A pressing mechanism is arranged at the side of the pressing station, connected to and communicated with the control host, works under the control of the control host, moves to the top of the pressing station, presses down the shell product and then returns to the side of the pressing station; The unloading suction cup mechanism is arranged at the side of the pressing station, is connected and communicated with the control host, works under the control of the control host, and unloads the shell product in a qualified pressing state.

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