A machine vision-based film defect detection apparatus

Abstract

The utility model belongs to the field of detection provides a kind of film defect detection equipment based on machine vision, comprising: machine table, the first end and the last end of machine table length direction are respectively equipped with power mechanism and driven mechanism, material belt can be moved on machine table when being stretched to power mechanism, by the driving force cooperation of power mechanism and the auxiliary traction of driven mechanism;Several groups of limiting mechanism, be located on machine table and distribute between power mechanism and driven mechanism.Compared with prior art, the utility model has the advantages that different functions are detected on product by visual detection mechanism, and the occurrence of missed detection and misjudgment phenomenon is avoided;Limiting mechanism can be adapted and adjusted according to different specifications of material belt, improve the flexibility and application range of equipment, and mark on product surface according to visual detection result by marking mechanism, facilitate subsequent screening and processing, whole process does not need manual intervention, improve detection efficiency, provide guarantee for product quality after forming.

Description

Technical Field

[0001] This utility model belongs to the field of testing, specifically relating to a machine vision-based coating defect detection device. Background Technology

[0002] In the current coating inspection industry, existing inspection equipment and technologies face significant challenges due to the increasing variety of product types and sizes, as well as the growing demand for production efficiency.

[0003] Most coating inspection equipment on the market is primarily suitable for a single product type and typically only performs limited inspection tasks, such as positional and dimensional inspection or impurity detection, but cannot simultaneously meet the inspection needs for multiple defect types. Furthermore, these devices often lack automatic marking capabilities, failing to effectively identify non-conforming products, potentially leading to confusion or misoperation in subsequent processing steps.

[0004] Specifically, the main limitations of existing technology include, but are not limited to, the following:

[0005] 1. Limited applicability: Most of the film coating inspection equipment on the market can only adapt to specific product sizes and shapes, and lacks sufficient flexibility for changing product specifications.

[0006] 2. Limited detection capabilities: Most equipment does not have the ability to simultaneously detect multiple defects such as the position and size of the coating, its own dimensional deviation, impurities on the coating surface, and exposed areas. This limits its application scope and technical efficiency.

[0007] 3. Low level of automation: Traditional inspection methods rely on manual inspection, which is not only inefficient but also prone to human error, affecting the quality control of the final product. Utility Model Content

[0008] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a machine vision-based coating defect detection device that features a simple structure, multifunctional detection capabilities, improved detection flexibility and adaptability, and ensured detection accuracy.

[0009] The objective of this utility model can be achieved through the following technical solution: A machine vision-based coating defect detection device is proposed for detecting the coating quality between an insulating layer and products arranged in an array on a strip. The strip has annular holes located at the diagonal edges of each product, and a positioning ring is printed around the circumference of each annular hole. The detection device includes:

[0010] The machine platform has a power mechanism and a driven mechanism respectively configured at its two ends along its length. When the material strip extends into the power mechanism, it can move on the machine platform by the driving force of the power mechanism and the auxiliary traction force of the driven mechanism.

[0011] Several sets of limiting mechanisms are provided on the machine platform and distributed between the power mechanism and the driven mechanism. Each set of limiting mechanisms has a guide cavity. The opening size of the guide cavity can be adapted and adjusted according to different specifications of material strips to guide the product to move along the length of the machine platform.

[0012] A visual inspection mechanism is installed on the machine platform. The visual inspection mechanism is used to sequentially inspect the coating quality of the insulating layer and the product, as well as the concentricity between the positioning ring and the annular hole at the diagonal edge of the product.

[0013] A marking mechanism is installed on the machine platform. The marking mechanism can mark the top and bottom walls of the product based on the quality data detected by the vision inspection mechanism when the material strip passes through.

[0014] In the aforementioned machine vision-based coating defect detection device, the power mechanism includes:

[0015] A connecting frame is located at the end of the machine base, and a traction wheel is movably installed inside the connecting frame;

[0016] The mounting column has several auxiliary wheels coaxially arranged on it. The connecting frame has a mounting groove. The mounting column is movably engaged into the mounting groove, so that the auxiliary wheels and the traction wheel are respectively close to the top wall and bottom wall of the material belt.

[0017] A drive unit is mounted on the connecting frame, and the output end of the drive unit is connected to the traction wheel to drive the material belt between the traction wheel and the auxiliary wheel to move relative to the machine platform.

[0018] In the aforementioned machine vision-based coating defect detection device, the vision inspection mechanism includes a line array camera and an area array camera spaced apart on the machine platform. The line array camera is used to detect the coating quality of the insulating layer on the product; the area array camera is used to detect the concentricity between the positioning ring and the corresponding annular hole at the diagonal edge of the product.

[0019] In the aforementioned machine vision-based coating defect detection device, the machine platform is further equipped with:

[0020] A support is mounted on the machine platform, and a light source is configured on the support. The light source and the machine platform together form an illumination area. When the material strip passes through the illumination area, it can be illuminated by the light source for detection by the line scan camera.

[0021] Guide rails and guide blocks are vertically arranged on the machine platform. The guide blocks are movably engaged with the guide rails, and a mounting bracket is connected to the guide blocks. The line scan camera is detachably connected to the mounting bracket to adjust the height difference between the line scan camera and the material belt.

[0022] In the aforementioned machine vision-based coating defect detection device, the driven mechanism includes:

[0023] A mounting base is provided at the end of the machine tool, and a connecting shaft is provided on the mounting base;

[0024] A pad and a driven roller are provided. The pad is located on the machine base, and the driven roller is located on the connecting shaft to guide the material strip on the pad to move along the direction of the traction wheel.

[0025] In the aforementioned machine vision-based coating defect detection device, each set of limiting mechanisms includes a reference block, a moving block, and an adjusting component. The reference block is disposed on the machine base, and the guide cavity is formed between the moving block and the reference block. The adjusting component is connected to the moving block and is used to adjust the distance between the moving block and the reference block.

[0026] In the aforementioned machine vision-based coating defect detection device, the adjusting component includes:

[0027] A fixed slide is mounted on the machine base, and a locking block is formed on the fixed slide.

[0028] The sliding block and the connecting plate are provided. The bottom wall of the sliding block has a locking groove, which is movably engaged with the locking block. One end of the connecting plate is connected to the moving block, and the other end is connected to the sliding block.

[0029] A locking element is installed on the side wall of the sliding block. The locking element is used to movably abut against the engaging block to restrict the movement of the sliding block relative to the fixed slide.

[0030] In the aforementioned machine vision-based coating defect detection device, the marking mechanism includes a first movable frame and a second movable frame. The top and bottom ends of the first movable frame and the second movable frame are provided with adjustment rails. Each adjustment rail is equipped with a marking machine at its output end. A marking area is formed between the two marking machines arranged vertically for the material strip to pass through.

[0031] In the aforementioned machine vision-based coating defect detection device, a support frame is also provided on the machine base, and a guide column is provided on the support frame. The first movable frame and the second movable frame are both movably sleeved on the guide column, and locking holes for fasteners to pass through are provided on the first movable frame and the second movable frame.

[0032] In the aforementioned machine vision-based coating defect detection device, a sensor located outside the machine base is also provided, which is used to detect the end position of the material strip.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] (1) The present invention provides a machine vision-based coating defect detection device that uses a vision inspection mechanism to perform different functions of product inspection. Compared with the traditional manual visual inspection method, the detection accuracy is greatly improved, effectively avoiding the occurrence of missed detection and misjudgment. With the help of the limiting mechanism, it can be adapted and adjusted according to different specifications of material strips, making the device suitable for the inspection of products of various sizes, improving the flexibility and applicability of the device. Finally, the marking mechanism marks the product surface according to the visual inspection results, which facilitates subsequent screening and processing, realizing a fully automatic continuous inspection process, greatly reducing the degree of manual participation, improving the inspection efficiency, and providing a guarantee for the quality of the molded product.

[0035] (2) The combination structure of sliding block and locking block simplifies the complexity of adjustment mechanism and avoids deviation during equipment operation. At the same time, the design of locking part ensures the stability after adjustment, improves the overall operational reliability, and enables the equipment to quickly switch production line configuration, thereby improving the flexibility and applicability of the equipment.

[0036] (3) Sensors outside the machine can detect the position of the material belt in real time, so as to avoid the material belt from drooping too much outside the machine and affecting the smoothness and accuracy of the entire detection process. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the overall structure of this application;

[0038] Figure 2 yes Figure 1 Enlarged view of section A in the image;

[0039] Figure 3 This is a schematic diagram of the limiting mechanism;

[0040] Figure 4 This is a schematic diagram of the power mechanism;

[0041] Figure 5 This is a schematic diagram of the marking mechanism.

[0042] In the diagram, 1 represents the material strip; 10 represents the product; and 11 represents the annular hole.

[0043] 2. Machine base; 20. Power mechanism; 200. Connecting frame; 200a. Mounting slot; 201. Traction wheel; 202. Mounting column; 203. Auxiliary wheel; 204. Driving component; 21. Driven mechanism; 210. Mounting base; 211. Connecting shaft; 212. Pad; 213. Driven roller; 22. Support frame; 23. Guide column; 24. Display; 25. Manual inspection station;

[0044] 3. Limiting mechanism; 30. Reference block; 31. Moving block; 320. Guide cavity; 33. Adjusting component; 330. Fixed slide; 331. Engaging block; 332. Sliding block; 332a. Engaging groove; 333. Connecting plate; 334. Locking component;

[0045] 4. Visual inspection mechanism; 40. Line scan camera; 41. Area scan camera; 42. Support; 43. Light source; 430. Illumination area; 44. Guide rail; 45. Guide block; 46. Mounting bracket;

[0046] 5. Marking mechanism; 50. First moving frame; 51. Second moving frame; 520. Locking hole; 53. Adjustment rail; 54. Marking machine; 540. Marking area. Detailed Implementation

[0047] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.

[0048] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0049] like Figures 1 to 5 As shown, this utility model discloses a machine vision-based coating defect detection device for detecting the coating quality between the insulating layer and the products 10 arranged in an array on the material strip 1. The material strip 1 has annular holes 11 located at the diagonal edges of each product 10, and each annular hole 11 is printed with a positioning ring around its circumference. The detection device includes a machine base 2, a power mechanism 20, a driven mechanism 21, several sets of limiting mechanisms 3, a vision inspection mechanism 4, and a marking mechanism 5.

[0050] Specifically, the power mechanism 20 and the driven mechanism 21 are respectively located at the beginning and end of the machine platform 2 along its length. When the material strip 1 extends into the power mechanism 20, it moves on the machine platform 2 under the driving force of the power mechanism 20 and the auxiliary traction force of the driven mechanism 21. Several sets of limiting mechanisms 3 are located on the machine platform 2 and distributed between the power mechanism 20 and the driven mechanism 21. Each set of limiting mechanisms 3 has a guide cavity 320. The opening size of the guide cavity 320 can be adapted and adjusted according to different specifications of material strip 1 to guide the product 10 to move along the length of the machine platform 2. The vision inspection mechanism 4 is located on the machine platform 2. The vision inspection mechanism 4 is used to sequentially detect the coating quality of the insulation layer and the product 10, as well as the concentricity between the positioning ring and the annular hole 11 at the diagonal edge of the product 10. The marking mechanism 5 is located on the machine platform 2. The marking mechanism 5 can mark the top and bottom walls of the product 10 according to the quality data detected by the vision inspection mechanism 4 when the material strip 1 passes through.

[0051] In this embodiment, the strip 1 has several products 10 arranged in an array at equal intervals, and each product 10 needs to be coated with an insulating layer. At the same time, black positioning rings are printed around several annular holes 11 (the annular holes 11 can be referenced). Figure 2 (Not shown in the positioning diagram), as the power mechanism 20 pulls the material belt 1 onto the machine platform 2, with the auxiliary traction force of the driven mechanism 21, the material belt 1 can move smoothly along the length of the machine platform 2 (i.e., Figure 1(Moving from left to right) During this process, multiple sets of limiting mechanisms 3 are distributed between the power mechanism 20 and the driven mechanism 21. Each set of limiting mechanisms 3 is equipped with an adjustable guide cavity 320. According to the width of different specifications of the material belt 1 or the spacing of the product 10, the opening size of the guide cavity 320 can be adjusted to ensure that the material belt 1 always runs along the predetermined trajectory. This structure not only improves the stability and positioning accuracy of the material belt 1 during operation, but also improves the versatility and flexibility of the equipment and reduces the false detection rate caused by the deviation of the material belt 1. As the conveyor belt 1 carries the product 10 through the visual inspection area, the vision mechanism first inspects the coating quality of the insulation layer on the product 10 (including the detection of impurities). Next, it inspects the concentricity between at least one diagonal positioning ring on the product 10 to determine if any misalignment has occurred during printing. This non-contact, high-speed online inspection ensures coating quality and positioning accuracy, preventing errors in subsequent stamping and assembly, and improving the quality control level of the product 10. After inspection, the product 10 is transferred to the marking mechanism 5. Based on the inspection results, the marking mechanism 5 automatically marks defective products (such as "NG" or a QR code) on their top or bottom walls for easy sorting and rejection. Therefore, the entire process in the equipment, from feeding and inspection to marking, requires no manual intervention, saving labor costs, improving inspection efficiency, and effectively preventing defective products from flowing into downstream processes, thus ensuring the consistency and reliability of the finished product 10.

[0052] The power mechanism 20 includes: a connecting frame 200, located at the end of the machine base 2, with a traction wheel 201 movably disposed within the connecting frame 200; a mounting column 202, on which several auxiliary wheels 203 are coaxially disposed, with a mounting groove 200a formed on the connecting frame 200, and the mounting column 202 movably engaging into the mounting groove 200a, so that the auxiliary wheels 203 and the traction wheel 201 are respectively pressed against the top and bottom walls of the material belt 1; and a driving component 204, mounted on the connecting frame 200, with the output end of the driving component 204 connected to the traction wheel 201, for driving the material belt 1 between the traction wheel 201 and the auxiliary wheels 203 to move relative to the machine base 2.

[0053] like Figure 1 and Figure 4 As shown, as the end of the material belt 1 extends between the auxiliary wheel 203 and the traction wheel 201, the drive unit 204 can be activated to drive the traction wheel 201 to rotate. Since the traction wheel 201 and the auxiliary wheel 203 are respectively pressed against the bottom wall and top wall of the material belt 1, forming an upper and lower clamping state, under the action of friction, the traction wheel 201 drives the material belt 1 to move along the length direction of the machine platform 2 (i.e., along the length direction of the machine platform 2). Figure 1(Moving from left to right). It should be noted that the auxiliary wheel 203 only generates friction on the conveyor belt 1 and will not damage the product 10 on the conveyor belt 1. In addition, in this embodiment, the mounting post 202 is fixed in the mounting groove 200a by snap-fit, which makes the assembly of the whole structure simple and provides convenience for subsequent disassembly and replacement. At the same time, the depth of the mounting groove 200a can be adjusted during the design process, thereby changing the clamping force of the auxiliary wheel 203 on the conveyor belt 1, ensuring the smoothness and stability of the entire conveying process.

[0054] The driven mechanism 21 includes: a mounting base 210 located at the end of the machine base 2, with a connecting shaft 211 on the mounting base 210; a pad 212 and a driven roller 213, the pad 212 being located on the machine base 2 and the driven roller 213 being located on the connecting shaft 211, for guiding the material belt 1 on the pad 212 to move along the direction of the traction wheel 201.

[0055] Furthermore, such as Figure 1 As shown, in this embodiment, the driven mechanism 21 is located at... Figure 1 At the leftmost end of the machine base 2 shown, the connecting shaft 211 is rotatably mounted on the mounting base 210. The connection between the two can be assembled by bearings to ensure the smoothness of the connecting shaft 211 driving the driven roller 213 to rotate. Similarly, in this embodiment, the pad 212 can be selected with different thicknesses according to actual needs to adapt to different specifications of material strip 1, ensuring the fit and guiding performance between the roller and the material strip 1, thereby changing the distance between the pad 212 and the driven roller 213, ensuring that the material strip 1 remains flat and moves forward stably under the friction between the material strip 1 and the driven roller 213 during the process of the traction wheel 201 driving the material strip 1 to move.

[0056] The machine base 2 is also equipped with: a bracket 42, which is mounted on the machine base 2, and a light source 43 is mounted on the bracket 42. The light source 43 and the machine base 2 together form an illumination area 430. When the material strip 1 passes through the illumination area 430, it can be illuminated by the light source 43 for detection by the line scan camera 40; a guide rail 44 and a guide block 45, which are set vertically on the machine base 2. The guide block 45 is movably engaged with the guide rail 44, and a mounting bracket 46 is connected to the guide block 45. The line scan camera 40 is detachably connected to the mounting bracket 46 to adjust the height difference between the line scan camera 40 and the material strip 1.

[0057] like Figure 1As shown, with the rotation of the aforementioned traction wheel 201, auxiliary wheel 203, and driven roller 213, the conveyor belt 1 can move the product 10 to the illumination area 430 formed by the light source 43 and the machine base 2. The light source 43 emits uniform light to illuminate the surface of the conveyor belt 1, significantly improving the clarity and contrast of image acquisition, reducing the misjudgment rate caused by uneven illumination, and ensuring the accuracy of visual inspection. At this time, the line scan camera 40 can slide flexibly on the guide rail 44 using the guide block 45, quickly adjusting the height difference between the line scan camera 40 and the conveyor belt 1 to adapt to the inspection requirements of products 10 of different specifications. Once it is ensured that the line scan camera 40 is stable and does not deviate,

[0058] The visual inspection mechanism 4 includes a line scan camera 40 and an area scan camera 41 spaced apart on the machine base 2. The line scan camera 40 is used to detect the coating quality of the insulating layer on the product 10; the area scan camera 41 is used to detect the concentricity between the positioning rings on the diagonal edges of the product 10 and the corresponding annular holes 11.

[0059] Furthermore, such as Figure 1 As shown, the visual inspection mechanism 4 in this embodiment mainly consists of two parts: a line scan camera 40 and an area scan camera 41. The line scan camera 40 collects image data of the product 10 on the strip 1 and transmits it to the visual processing system for defect identification and concentricity analysis of the positioning rings. That is, the line scan camera 40 collects images of each product 10 and its surface insulation layer, and identifies whether there are defects such as missing glue, bubbles, foreign objects, and uneven thickness through image processing algorithms. The area scan camera 41 performs simultaneous inspection of several sets of structures (for example, simultaneously inspecting the annular holes 11 at the edges of 5 sets of products 10). When the two positioning rings and annular holes 11 at the diagonal of one of the products 10 are not concentrically set, it can be determined that an offset phenomenon has occurred during the printing process. Conversely, if the positioning rings and annular holes 11 are on the same axis, it is determined that the product 10 and its surrounding structure meet the required processing and use requirements.

[0060] Each set of limiting mechanisms 3 includes a reference block 30, a moving block 31, and an adjusting member 33. The reference block 30 is set on the machine base 2, and a guide cavity 320 is formed between the moving block 31 and the reference block 30. The adjusting member 33 is connected to the moving block 31 and is used to adjust the distance between the moving block 31 and the reference block 30.

[0061] like Figure 1 and Figure 3As shown, before the equipment is put into use, according to the specifications of the product 10 to be tested (such as the width of the strip 1, the spacing of the product 10, etc.), the operator adjusts the position of the moving block 31 through the adjusting component 33. Then, the size of the opening of the guide cavity 320 is determined by the distance between the moving block 31 and the reference block 30. This structure also enables the equipment to adapt to strips 1 of different widths or thicknesses, improving the equipment's versatility and flexible production capabilities. When the strip 1 passes through the guide cavity 320, it is restricted on both sides by the reference block 30 and the moving block 31, thereby being guided to the predetermined running trajectory. This effectively avoids problems such as visual mis-inspection and inaccurate marking caused by the shaking or positional deviation of the strip 1, ensuring the accuracy of subsequent inspection and marking processes. Meanwhile, multiple sets of limiting mechanisms 3 are distributed along the conveying path of the strip 1 to ensure that the strip 1 remains stable, centered, and without deviation throughout the entire operation.

[0062] The adjusting component 33 includes: a fixed slide 330, mounted on the machine base 2, with a locking block 331 formed on the fixed slide 330; a sliding block 332 and a connecting plate 333, with a locking groove 332a formed on the bottom wall of the sliding block 332, which is movably engaged with the locking block 331; one end of the connecting plate 333 is connected to the moving block 31, and the other end is connected to the sliding block 332; and a locking component 334, mounted on the side wall of the sliding block 332, which is used to movably abut against the locking block 331 to restrict the movement of the sliding block 332 relative to the fixed slide 330.

[0063] like Figure 3 As shown, in this embodiment, before changing the specification of product 10 or adjusting the width of the guide cavity 320, the operator first loosens the locking member 334. After the locking member 334 releases the clamping force on the locking block 331, the sliding block 332 can move laterally (i.e., towards the reference block 30) by relying on the cooperation between the locking groove 332a and the locking block 331. As the sliding block 332 drives the connecting plate 333 to move, the distance between the moving block 31 and the reference block 30 is changed. After adjusting to the required position, the operator retightens or activates the locking member 334 to press against the locking block 331 and restrict the movement of the sliding block 332. It can be seen that the precise cooperation between the locking groove 332a and the locking block 331 ensures a smooth and accurate adjustment process, improves the positioning accuracy of the limiting mechanism 3 for the material strip 1, and prevents deviation caused by vibration or external force during equipment operation under the locking of the locking member 334, ensuring the stability and consistency of the detection process. It should be noted that the locking component 334 in this embodiment can be made of bolts, screws or other components to achieve the unlocking and locking functions of the sliding block 332.

[0064] The marking mechanism 5 includes a first movable frame 50 and a second movable frame 51. The top and bottom ends of the first movable frame 50 and the second movable frame 51 are provided with adjustment rails 53. Each adjustment rail 53 is equipped with a marking machine 54 at its output end. A feeding belt 1 is formed between the two marking machines 54 arranged in the vertical direction, passing through the marking area 540.

[0065] like Figure 1 and Figure 5 As shown, the marking machine 54 used in this embodiment is an ink marking machine 54, and the marking machine 54 is respectively configured on the first moving frame 50 and the second moving frame 51, so as to mark the top and bottom walls of the product 10 at the same time, avoid repeated marking processes, and improve production efficiency. The difference is that the marking machine 54 can be horizontally adjusted by adjusting the positioning rail 53 (that is, adjusting the relative position with the machine table 2), so as to accurately align the products 10 of different specifications on the material belt 1. When the product 10 after being detected by the line scan camera 40 and the area scan camera 41 is moved into the marking area 540, double-sided inkjet printing can be performed according to the actual detection situation (that is, marking the product 10 as qualified or unqualified), so as to provide the operator with identification during the subsequent stamping process of the product 10.

[0066] The machine base 2 is also equipped with a support frame 22, and a guide column 23 is provided on the support frame 22. The first movable frame 50 and the second movable frame 51 are both movably sleeved on the guide column 23, and locking holes 520 for fasteners to pass through are provided on the first movable frame 50 and the second movable frame 51.

[0067] Furthermore, such as Figure 5 As shown, in this embodiment, both the first movable frame 50 and the second movable frame 51 can slide freely along the axis of the guide column 23, thereby adjusting the distance between the two adjacent marking machines 54 (two marking devices, one above the other) to adapt to the needs of products 10 with different thicknesses or marking positions, improving the equipment's versatility and flexible production capabilities. The guide column 23 provides rigid guidance, preventing the movable frames from swaying or tilting, ensuring that the marking machine 54 always maintains a vertical movement trajectory, improving the consistency and accuracy of the marking position. It should be noted that after the distance between the first movable frame 50 and the second movable frame 51 is adjusted, screws or other components can be passed through the locking hole 520 to limit the displacement or swaying of the two movable frames.

[0068] Preferably, this embodiment also provides an external sensor on the machine 2. The sensor is used to detect the end position of the material belt 1, so as to avoid idling, false detection or marking errors caused by the material belt 1 not being in place or being used up, thereby improving the intelligence level of the equipment.

[0069] More preferably, such as Figure 1As shown, this embodiment can also be equipped with a display 24 and a manual inspection station 25 on the machine 2, which provides a manual operation station and a display of the detection capacity when manual intervention is required.

[0070] It should be noted that the driving component 204 in this embodiment can be replaced by other driving devices such as stepper motors and servo motors.

[0071] It should be noted that in this invention, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0072] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0073] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A machine vision-based coating defect detection device for detecting the coating quality between an insulating layer and products arranged in an array on a strip, wherein, The strip has annular holes located at the diagonal edges of each product, and each annular hole has a positioning ring printed around its circumference. The detection device comprises: The machine platform has a power mechanism and a driven mechanism respectively configured at its two ends along its length. When the material strip extends into the power mechanism, it can move on the machine platform by the driving force of the power mechanism and the auxiliary traction force of the driven mechanism. Several sets of limiting mechanisms are provided on the machine platform and distributed between the power mechanism and the driven mechanism. Each set of limiting mechanisms has a guide cavity. The opening size of the guide cavity can be adapted and adjusted according to different specifications of material strips to guide the product to move along the length of the machine platform. A visual inspection mechanism is installed on the machine platform. The visual inspection mechanism is used to sequentially inspect the coating quality of the insulating layer and the product, as well as the concentricity between the positioning ring and the annular hole at the diagonal edge of the product. A marking mechanism is installed on the machine platform. The marking mechanism can mark the top and bottom walls of the product based on the quality data detected by the vision inspection mechanism when the material strip passes through.

2. The machine vision-based coating defect detection device according to claim 1, characterized in that, The power mechanism includes: A connecting frame is located at the end of the machine base, and a traction wheel is movably installed inside the connecting frame; The mounting column has several auxiliary wheels coaxially arranged on it. The connecting frame has a mounting groove. The mounting column is movably engaged into the mounting groove, so that the auxiliary wheels and the traction wheel are respectively close to the top wall and bottom wall of the material belt. A drive unit is mounted on the connecting frame, and the output end of the drive unit is connected to the traction wheel to drive the material belt between the traction wheel and the auxiliary wheel to move relative to the machine platform.

3. The machine vision-based coating defect detection device according to claim 1, characterized in that, The visual inspection mechanism includes a line scan camera and an area scan camera spaced apart on the machine platform. The line scan camera is used to detect the coating quality of the insulating layer on the product; the area scan camera is used to detect the concentricity between the positioning ring and the corresponding annular hole at the diagonal edge of the product.

4. The machine vision-based coating defect detection device according to claim 3, characterized in that, The machine is also equipped with: A support is mounted on the machine platform, and a light source is configured on the support. The light source and the machine platform together form an illumination area. When the material strip passes through the illumination area, it can be illuminated by the light source for detection by the line scan camera. Guide rails and guide blocks are vertically arranged on the machine platform. The guide blocks are movably engaged with the guide rails, and a mounting bracket is connected to the guide blocks. The line scan camera is detachably connected to the mounting bracket to adjust the height difference between the line scan camera and the material belt.

5. The machine vision-based coating defect detection device according to claim 2, characterized in that, The driven mechanism includes: A mounting base is provided at the end of the machine tool, and a connecting shaft is provided on the mounting base; A pad and a driven roller are provided. The pad is located on the machine base, and the driven roller is located on the connecting shaft to guide the material strip on the pad to move along the direction of the traction wheel.

6. The machine vision-based coating defect detection device according to claim 1, characterized in that, Each set of limiting mechanisms includes a reference block, a moving block, and an adjusting component. The reference block is disposed on the machine base, and the guide cavity is formed between the moving block and the reference block. The adjusting component is connected to the moving block and is used to adjust the distance between the moving block and the reference block.

7. The machine vision-based coating defect detection device according to claim 6, characterized in that, The adjusting element includes: A fixed slide is mounted on the machine base, and a locking block is formed on the fixed slide. The sliding block and the connecting plate are provided. The bottom wall of the sliding block has a locking groove, which is movably engaged with the locking block. One end of the connecting plate is connected to the moving block, and the other end is connected to the sliding block. A locking element is installed on the side wall of the sliding block. The locking element is used to movably abut against the engaging block to restrict the movement of the sliding block relative to the fixed slide.

8. The machine vision-based coating defect detection device according to claim 1, characterized in that, The marking mechanism includes a first movable frame and a second movable frame. The top and bottom of the first movable frame and the second movable frame are provided with adjustment rails. Each adjustment rail is equipped with a marking machine at its output end. A marking area is formed between the two marking machines arranged vertically so that the material belt can pass through the marking area.

9. A machine vision-based coating defect detection device according to claim 8, characterized in that, The machine base is also provided with a support frame, and the support frame is provided with a guide column. The first movable frame and the second movable frame are both movably sleeved on the guide column, and locking holes for fasteners to pass through are provided on the first movable frame and the second movable frame.

10. The machine vision-based coating defect detection device according to claim 1, characterized in that, The machine platform is also equipped with an external sensor, which is used to detect the end position of the material strip.

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