Resin plug hole detection machine with re-inspection function, detection method and detection system

Abstract

The present invention discloses a resin plug hole inspection machine with a re-inspection function, an inspection method, and an inspection system. The resin plug hole inspection machine with a re-inspection function includes: a workbench for fixing a circuit board; a light detection module including a light board, a polarizer, and a camera. The light board is provided with a white light source and an ultraviolet light source. The polarizer can receive light reflected from the circuit board and emit light to the camera. The ultraviolet light source and the white light source respectively cooperate with the camera to inspect and re-inspect the circuit board. A first drive component drives the light detection module to move; a heat dissipation module for dissipating heat from the workbench; a cleaning module for scraping dirt off the end surface of the workbench; and a control system integrating the above modules, including an image display screen for displaying the camera image. The resin plug hole inspection machine with a re-inspection function uses an ultraviolet light source to inspect the plug hole quality and a white light source for re-inspection. Combined with vacuum adsorption fixation, heat dissipation and cleaning of the workbench, and intelligent image analysis technology, high-precision and high-efficiency inspection of the resin plug holes of the circuit board is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit board manufacturing, and in particular to a resin plugging hole detection machine with a re-inspection function, a detection method applied to the resin plugging hole detection machine with a re-inspection function, and a detection system applied to the resin plugging hole detection machine with a re-inspection function. Background Art

[0002] In the circuit board manufacturing process, resin plugging is a core step in ensuring interlayer electrical connections and structural stability in multilayer circuit boards. The quality of these vias is directly related to the performance and reliability of the circuit board. Any minor defects, such as incomplete filling, air bubbles within the vias, resin overflow, or uncured resin, can affect the circuit board's signal transmission efficiency and moisture resistance, leading to increased failure rates in electronic products. Therefore, resin plugging inspection is an essential step in the PCB manufacturing process.

[0003] However, existing technologies face multiple challenges in this area:

[0004] 1. Limitations and subjectivity of manual inspection, resulting in low efficiency and high costs: Traditional manual visual inspection methods rely heavily on manpower, resulting in slow inspection speeds and unable to meet the high-efficiency, high-volume production demands of the modern electronics manufacturing industry. Furthermore, labor costs continue to rise. Furthermore, manual inspection results are easily affected by factors such as operator experience, vision, and fatigue, making it difficult to unify judgment standards between different inspectors. This results in poor repeatability and consistency in inspection results, increasing the difficulty of product quality control. Furthermore, manual inspection has limited ability to identify complex defects: Faced with complex resin plugging defect types, such as bubbles within the hole, uneven resin filling, and poor hole wall adhesion, manual inspection often struggles to accurately identify and quantify them, hindering in-depth defect analysis and the development of improvement measures.

[0005] 2. Single judgment and high misjudgment rate: A few companies use automatic detection of the quality of resin plug holes, but they all take a single photo and analyze the static picture, and then directly judge whether the resin plug holes are qualified or not, and put them into the finished board collection area or the waste board collection area respectively. This leads to a high misjudgment rate in production.

[0006] 3. The impact of temperature on resin performance: The physical and chemical properties of the resin, such as viscosity, fluidity, and curing speed, change with temperature. During the inspection of resin plug holes, if the ambient temperature is too high, the photosensitive resin may become too soft or begin to melt, causing the shape and size of the plug holes to change, affecting the accuracy and reliability of the inspection. Existing inspection equipment often ignores the importance of temperature control and fails to provide a stable inspection environment. Especially when running continuously for a long time, the increase in the internal temperature of the equipment may affect the performance of the inspection components and reduce the inspection accuracy. Current inspection equipment mostly uses infrared light for inspection, and infrared light, due to its strong thermal effect, may cause thermal damage to the resin material. When used for a long time during inspection, it causes the components supporting the circuit board to heat up and fundamentally affects the quality of the plug holes, and gradually causes the photosensitive resin to melt out of the hole during inspection.

[0007] 4. Insufficient stability in the inspection environment: The conventional conveyor roller method commonly used in PCB inspection can cause PCBs to wobble as they travel on the rollers due to variations in roller diameter, wear, or uneven installation. This makes it impossible to maintain an absolutely horizontal surface during inspection. This directly impacts the focusing accuracy and image clarity of the inspection equipment, and thus the accuracy of the inspection results. Furthermore, gaps and uneven rotation of the rollers can cause positional deviations during transport. For inspection tasks requiring precise positional information, such as measuring the depth and position of resin vias, this positional deviation can have a significant impact, reducing inspection efficiency and reliability. Furthermore, friction between the PCB and the rollers can cause surface damage, especially on pre-treated boards, where even minor scratches can affect final product quality. This issue is particularly prominent in PCB resin via inspection, as this requires extremely high precision and consistency. Any slight wobble or positional deviation can distort the inspection results. For example, a non-horizontal PCB position can alter the angle of incidence of the light, affecting the illumination of the inspection light on the resin vias and interfering with the detection of internal defects. In addition, the unstable state of the circuit board during the inspection process may also introduce additional noise, reducing the accuracy and reliability of image analysis.

[0008] In summary, existing technologies have significant limitations and deficiencies in the detection of resin plug holes in circuit boards. A new type of automated and intelligent detection solution is urgently needed to overcome the above challenges and achieve high-precision, high-efficiency, and high-adaptability resin plug hole quality control. Summary of the Invention

[0009] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, the present invention provides a resin via inspection machine with a re-inspection function. This machine innovatively combines vacuum adsorption fixation, a precision optical detection module, an automated drive assembly, and intelligent image analysis technology to achieve high-precision and high-efficiency inspection of resin vias in circuit boards.

[0010] The present invention also provides a detection method and a detection system applied to the above-mentioned resin plug hole detection machine with a re-inspection function.

[0011] The resin plug hole detection machine with re-inspection function according to the present invention comprises:

[0012] base;

[0013] A workbench for placing a circuit board, the workbench being connected to the machine base, the end surface of the workbench being provided with a plurality of ventilation holes, the ventilation holes being connected to a vacuum generator to adsorb and fix the circuit board; the workbench being sealedly connected to a gas exchange cover, the gas exchange cover being located below the ventilation holes, the plurality of ventilation holes being communicated with the gas exchange cover, the gas exchange cover being provided with ventilation holes, the ventilation holes and the vacuum generator forming a vacuum air path to adsorb the circuit board; the ventilation holes being further connected to an air outlet pipe and forming an air outlet air path with the air outlet pipe to drive the circuit board to separate from the workbench and blow out dirt in the ventilation holes;

[0014] a light detection module connected to the machine base and located above the workbench, the light detection module comprising a light board, a polarizing plate, and a camera; the light board being a hollow structure, the camera, the polarizing plate, and the hollow portion of the light board being in the same straight line; the light board being provided with a plurality of ultraviolet light sources, the illumination side of the ultraviolet light sources being directed toward the workbench; the polarizing plate being located on the photographic side of the camera to receive light reflected from the circuit board and emit light to the camera; the light board being further provided with a white light source, the white light source cooperating with the camera to re-inspect the circuit board;

[0015] A first driving assembly, connected to and driving the light detection module to move linearly in a plane parallel to the end surface of the workbench;

[0016] a heat dissipation module connected to the workbench and used to dissipate heat from the workbench, the heat dissipation module comprising a water tank and a water pump, the water tank being connected to a water inlet pipe and a water outlet pipe, the water inlet pipe and the water outlet pipe being respectively connected to opposite side walls of the workbench, a water-cooling chamber being provided inside the workbench, the water pump being used to pump water from the water tank to the water inlet pipe, and driving the water to flow through the water-cooling chamber and the water outlet pipe, so as to circulate water and cool the workbench; a plurality of the water inlet pipe, the water outlet pipe and the water-cooling chamber are provided and arranged in a one-to-one correspondence, a plurality of the water-cooling chambers extending linearly and being arranged through, and two ends of the water-cooling chamber being respectively connected to the water inlet pipe and the water outlet pipe;

[0017] The cleaning module is connected to the machine base, and the cleaning module includes a second driving assembly and a scraping bar, the scraping bar abuts and cooperates with the end surface of the workbench, the second driving assembly is connected and drives the scraping bar to move in a horizontal direction, and the scraping bar abuts against the end surface of the workbench to scrape off dirt on the end surface of the workbench; the cleaning module also includes a driving cylinder, which is connected and drives the scraping bar to move along a side toward the end surface of the workbench and drives the scraping bar to press against the end surface of the workbench, the machine base is connected to a collection box, the collection box is located on the side where the scraping bar moves along the scraping dirt, the scraping bar is tilted downward and forms an angle with the end surface of the workbench, the scraping bar is connected to an air blowing pipe, the air blowing pipe is located on the side where the scraping bar moves along the scraping dirt, and the blowing side of the air blowing pipe is arranged downward;

[0018] A control system is provided for integratedly controlling the light detection module, the first driving component, the heat dissipation module and the cleaning module. The control system includes a display screen for displaying the image of the camera.

[0019] The resin plug hole inspection machine with re-inspection function according to the present invention has at least the following beneficial effects:

[0020] 1. Precise defect detection and low heat generation: Ultraviolet light excites photosensitive resins to produce fluorescence, allowing it to effectively penetrate the resin and reveal hidden defects such as tiny pores, cracks, or inadequately filled areas. Compared to infrared light, UV light has a relatively small thermal effect, but its high energy density means that during the inspection process, UV light does not significantly heat the circuit board, resin, or workbench like infrared light does. This avoids resin deformation, viscosity changes, or other thermal damage caused by elevated temperatures, ensuring the stability of the inspection process and the reliability of the results. Furthermore, compared to infrared light, UV light has a higher energy density, meaning that even smaller resin plugs can be detected during inspection, improving the versatility and accuracy of the inspection.

[0021] 2. Combination of automatic detection and manual re-inspection: After the optical detection module uses ultraviolet light source detection, there is no need to move the circuit board. The white light source cooperates with the camera to re-inspect the circuit board, which supplements the limitations of ultraviolet light source detection, ensures a comprehensive quality assessment of the circuit board, and reduces misjudgments in automatic detection. At this time, the operator can operate directly on the display screen and conveniently control the optical detection module to move to the position requiring re-inspection for manual judgment based on the position point obtained by detection, thereby improving the efficiency of re-inspection.

[0022] 3. Precise positioning and stable adsorption: The vent holes on the end face of the workbench work together with the vacuum generator to ensure that the circuit board is safely adsorbed during the inspection process, avoiding the shaking and position deviation of the circuit board that may occur in traditional conveying methods, and significantly improving the positioning accuracy of the inspection and the clarity of image acquisition.

[0023] 4. Intelligent image acquisition and analysis: The optical detection module integrates a UV light source and a high-resolution camera, supplemented by polarizing technology. It can capture and clearly present detailed images of the resin plugging area of the circuit board. It can be combined with advanced AI detection systems to automatically identify and classify various complex defect types, including but not limited to missing seals, cracked sealing green oil, raised and sunken sealing green oil, insufficient sealing depth, offset plugging, and red hole mouths, greatly improving detection efficiency and accuracy.

[0024] 5. Automated Drive and Flexibility: The primary drive assembly ensures precise linear motion of the optical inspection module within a plane parallel to the worktable end face. Combined with sophisticated image acquisition and analysis, this enables a high degree of automation in the inspection process. Furthermore, the system can flexibly adjust inspection parameters based on circuit board size and inspection requirements, enhancing the versatility and adaptability of the inspection machine.

[0025] 6. Temperature control and stability assurance: The addition of the heat dissipation module effectively controls the temperature of the workbench through the water cooling circulation system consisting of a water tank and a water pump, avoiding fluctuations in resin properties caused by temperature changes, and ensuring the consistency of testing conditions and the reliability of test results.

[0026] According to the resin plug hole inspection machine with re-inspection function described in some embodiments of the present invention, the machine base is installed with a third drive component, and the third drive component is connected to and drives the camera to move in the vertical direction to adjust the distance between the camera and the end face of the workbench.

[0027] According to the resin plug hole inspection machine with re-inspection function described in some embodiments of the present invention, the workbench is slidably arranged on the machine base, and the machine base is equipped with an ultraviolet protection curtain and a linear drive assembly. The two sides of the ultraviolet protection curtain are the inspection station and the loading station respectively, and the linear drive assembly is connected to drive the workbench to reciprocate between the inspection station and the loading station.

[0028] According to the detection method described in the present invention, the resin plug hole detection machine with re-inspection function described in the present invention is applied, comprising the following steps: placing the board and fixing it: placing the circuit board on the end face of the workbench, generating negative pressure in the vent hole through the vacuum generator, and adsorbing and fixing the circuit board; detecting plug hole defects: after placing the board and fixing it, the first driving component drives the light detection module to move horizontally, the ultraviolet light source emits light, and the ultraviolet light will show fluorescence after passing through the photosensitive resin. Then, the camera captures the image and analyzes the degree of fluorescence difference in the plug hole area of the circuit board to determine the blockage condition of the plug hole; heat dissipation treatment: after placing the board and fixing it, the heat dissipation module is operated to dissipate heat for the workbench; taking the board: after detecting the plug hole defect, if the plug hole is qualified, the circuit board is taken out and placed in the qualified frame; re-inspection: after detecting the plug hole defect, if the plug hole is unqualified, the plug hole defect of the circuit board is re-inspected; cleaning treatment: after taking the board or re-inspecting, the cleaning module is operated, and the scraper scrapes off the dirt on the end face of the workbench.

[0029] The detection method according to the present invention has at least the following beneficial effects: by using vacuum adsorption to fix the circuit board, the stability of the detection process is enhanced, and the combination of the ultraviolet light source and the camera can efficiently identify plugging defects and provide detailed detection results. At the same time, the heat dissipation treatment ensures the temperature stability of the detection environment, which is conducive to maintaining the physical and chemical properties of the resin, thereby ensuring the reliability of the detection; and the board removal and re-inspection steps distinguish between qualified and unqualified products, ensuring the screening of high-quality circuit boards. Finally, the cleaning treatment ensures the cleanliness of the workbench, reduces the potential contamination of subsequent detection, extends the life of the equipment, and greatly improves the efficiency, accuracy and reliability of circuit board resin plugging detection.

[0030] According to the detection system of the present invention, it is applied to the resin plug hole detection machine with re-inspection function of the present invention, including an acquisition module, a storage end, a comparison module, an analysis module, a client and a server; the acquisition module is used to acquire ultraviolet fluorescence images of the circuit board to be detected; the storage end includes ultraviolet fluorescence images of multiple qualified circuit boards and ultraviolet fluorescence images of multiple types of unqualified circuit boards; the comparison module is used to perform feature comparison between the image collected by the acquisition module and the image in the storage end; the analysis module is used to analyze the comparison information output by the comparison module to form a detection suggestion; the client is used to receive and view the collected image, the image participating in the collection image comparison and the detection suggestion; the server is used to connect to the acquisition module and the storage end network, upload or download the image of the acquisition module or the storage end; it also includes the following features: the comparison module cuts the input collection image into blocks and partitions so that each partition forms a feature image; the collection image input by the acquisition module is compared with the qualified image in the storage end, and if the similarity reaches 1, the analysis module outputs the detection suggestion "plug hole quality: completely qualified"; if the similarity is less than 1, the feature image is compared with the qualified image, and if the similarity of all feature images is above 0 .9 or above, the analysis module outputs a detection suggestion "plugging quality: basically qualified". If the similarity of one of the feature images is less than 0.9, the system enters deep comparison; in the deep comparison, the comparison module cuts the input unqualified image into blocks and partitions so that each partition forms a sample image, and compares all the feature images of the captured image with the partitions corresponding to all the sample images of the unqualified image separately, and calculates the similarity of the feature images based on the features; if the similarity between the feature image and the sample image is low, the captured image of the feature image is output and all the feature areas are marked, the analysis module calculates the probability and outputs a detection suggestion "plugging quality: may be qualified, manual re-inspection is recommended", and outputs the result to the client; if the similarity between the feature image and the sample image is high, the analysis module calculates the probability and outputs a detection suggestion "plugging quality: unqualified", and outputs the result to the client.

[0031] The inspection system according to the present invention has at least the following beneficial effects: it can automatically collect ultraviolet fluorescence images of the circuit board to be inspected, and intelligently compare them with a large number of images of qualified and unqualified circuit boards that have been inspected, and output detailed inspection suggestions through the analysis module, which not only greatly improves the inspection efficiency, but also ensures the objectivity and accuracy of the inspection results; and the system also has deep comparison capabilities, which can accurately identify complex or subtle defects, and calculate the similarity and output the probability by comparing the feature image with the sample image, to assist manual re-inspection or directly determine the quality of the plug hole, reducing misjudgment and missed judgment; in addition, the network connection between the client and the server realizes remote access and management of the inspection data, promotes the real-time production monitoring and the efficiency of decision-making, and significantly improves the intelligence level and quality control capability of the circuit board resin plug hole inspection.

[0032] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0034] Figure 1 This is a schematic diagram of the overall structure of a resin plug hole inspection machine with a re-inspection function according to an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the connection structure of the optical detection module of the resin plug hole detection machine with re-inspection function according to an embodiment of the present invention;

[0036] Figure 3 This is a schematic diagram of the operation of the optical detection module of the resin plug hole detection machine with a re-inspection function according to an embodiment of the present invention;

[0037] Figure 4 This is a first structural schematic diagram of the workbench portion of the resin plug hole inspection machine with a re-inspection function according to an embodiment of the present invention;

[0038] Figure 5 This is a second structural schematic diagram of the workbench portion of the resin plug hole inspection machine with a re-inspection function according to an embodiment of the present invention;

[0039] Figure 6 This is a schematic structural diagram of a workbench of a resin plug hole inspection machine with a re-inspection function according to an embodiment of the present invention;

[0040] Figure 7 This is an exploded view of the linear drive assembly of the resin plug hole inspection machine with a re-inspection function according to an embodiment of the present invention;

[0041] Figure 8This is a schematic diagram of the automated application of a resin plug hole inspection machine with a re-inspection function according to an embodiment of the present invention;

[0042] Figure 9 This is a flow chart of a detection method according to an embodiment of the present invention;

[0043] Figure 10 Flowchart of a detection system according to an embodiment of the present invention.

[0044] Description of Figure Numbers:

[0045] Machine base 100; vacuum generator 110; collection box 120; UV protection curtain 130; linear drive assembly 140; first transmission block 141;

[0046] Workbench 200; vent 201; gas exchange cover 210; vent 2101;

[0047] Light detection module 300; light board 310; ultraviolet light source 311; polarizer 320; camera 330;

[0048] First drive assembly 400; first linear module 410; second linear module 420; third linear module 430;

[0049] Heat dissipation module 500; water tank 510; water inlet pipe 520; water outlet pipe 530;

[0050] Cleaning module 600; second drive assembly 610; second transmission block 611; scraper 620; air blow pipe 621; drive cylinder 630; sliding plate 640; connecting plate 641; guide column 642;

[0051] Display screen 700;

[0052] Six-axis robot 800. DETAILED DESCRIPTION

[0053] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0054] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0055] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0056] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0057] In the description of the present invention, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0058] like Figures 1 to 8As shown, the resin plug hole inspection machine with a re-inspection function proposed in the present invention includes a machine base 100, a workbench 200 connected to the machine base 100, a light detection module 300 connected to the machine base 100 and located above the workbench 200, a first driving component 400 that is connected to and drives the light detection module 300 to perform planar linear motion parallel to the end face of the workbench 200, a heat dissipation module 500 connected to the workbench 200 and used to dissipate heat from the workbench 200, a cleaning module 600 connected to the machine base 100 and used to clean dirt from the workbench 200, and a control system that integrates and controls the light detection module 300, the first driving component 400, the heat dissipation module 500 and the cleaning module 600. Specifically, the workbench 200 is used to hold circuit boards. The end surface of the workbench 200 is provided with a plurality of vents 201, which are connected to the vacuum generator 110 to secure the circuit boards by suction, ensuring that the circuit boards remain stable during the inspection process and avoiding inspection errors caused by movement of the circuit boards. Furthermore, compared to directly placing the circuit boards flat on the workbench 200, securing the circuit boards by suction allows the end surfaces of the circuit boards to be closely attached to the workbench 200, further improving the flatness of the circuit boards and reducing local errors in subsequent photographic images that could affect automated judgment. Furthermore, the light detection module 300 includes a light board 310, a polarizer 320, and a camera 330. The light board 310 is a hollow structure, and the hollow portions of the camera 330, polarizer 320, and light board 310 are aligned. Furthermore, the light board 310 is provided with a plurality of ultraviolet light sources 311, the irradiation side of the ultraviolet light source 311 faces the workbench 200, and the polarizer 320 is located on the photographic side of the camera 330 to receive the light reflected by the circuit board and emit light to the camera 330, which can more accurately detect the internal condition of the resin plug hole and reduce misjudgments and missed judgments. In addition, the cleaning module 600 includes a second drive component 610 and a scraper 620. The scraper 620 is in abutment with the end face of the workbench 200. The second drive component 610 is connected and drives the scraper 620 to move in a horizontal direction. The scraper 620 is in abutment with the end face of the workbench 200 to scrape off dirt on the end face of the workbench 200. The cleaning module 600 can regularly clean the surface of the workbench 200, reduce the impact of dust and other impurities on the detection results, and extend the service life of the equipment. It's easy to understand that dirt includes dust directly attached to workbench 200, various waste materials transferred to workbench 200 by adhering to the end surfaces of circuit boards, and resin leaked onto workbench 200 from plug holes in circuit boards. Using scraper 620 to scrape the end surfaces of workbench 200 effectively removes these various dirt items, keeping the end surfaces of workbench 200 clean, improving the flatness of circuit boards placed on workbench 200, and reducing interference with plug hole detection by optical detection module 300. In particular, in comparisons of detection systems based on big data AI, the lower the volatility of each image, the more accurate the AI's intelligent judgment.In addition to allowing AI to directly make system judgments, the control system includes a display screen 700 to display the image of the camera 330, which can be used for visual judgment by the operator. Especially for situations where the system cannot directly make a judgment, the operator can re-check the plug hole on the display screen 700.

[0059] Refer again Figure 2 and Figure 3 The first drive assembly 400 includes a first linear module 410 and a second linear module 420 connected in sequence. The first linear module 410 and the second linear module 420 are arranged perpendicular to each other in a horizontal plane. Therefore, the light detection module 300 can be driven by the first drive assembly 400 to perform programmed movement in the x0y plane to detect the quality of the resin plug holes in various areas of the circuit board. In the re-inspection application, in order to reduce the change in the position of the circuit board, in some embodiments, the light board 310 is provided with a white light source, and the white light source cooperates with the camera 330 to re-inspect the circuit board. This supplements the limitations of the ultraviolet light source 311 detection, ensures a comprehensive quality assessment of the circuit board, and reduces misjudgments in automatic detection. It is easy to understand that ultraviolet light can cause harm to the human body and needs to be separated from the operator during operation. By setting a white light source in the light detection module 300 to assist in manual re-inspection, the light detection module 300 does not need to move the circuit board after the detection is completed using the ultraviolet light source 311. The operator can operate directly on the display screen 700 and conveniently control the light detection module 300 to move to the position to be re-inspected according to the position point obtained by the detection, thereby improving the efficiency of the re-inspection. In some debugging applications, the depth of field of the camera 330 is adjusted to the position of the upper circuit board thickness on the end face of the workbench 200. However, for circuit boards of different thicknesses, the height of the camera 330 needs to be readjusted. In addition, when using a white light source different from the ultraviolet light source 311 for irradiation, the camera 330 needs to be refocused. The visual recognition focus debugging of the industrial camera 330 requires debugging personnel with higher professional skills to perform debugging. In order to facilitate the operation of ordinary operators, refer to Figure 2In some embodiments of the present invention, the base 100 is equipped with a third drive assembly, which is connected to and drives the camera 330 to move in a vertical direction to adjust the distance between the camera 330 and the end surface of the workbench 200 to meet the inspection requirements of circuit boards of different thicknesses. This improves the versatility and adaptability of the inspection system and is suitable for inspecting circuit boards of various specifications. In particular, during the re-inspection operation, the operator can use the third drive assembly to drive the camera 330 to move to zoom in or out of the area to be re-inspected, thereby better judging the quality of the resin plug hole. Specifically, the third drive assembly includes a third linear module 430, which is arranged vertically and connected to the output end of the second linear module 420. Therefore, with the cooperation of the first linear module 410, the second linear module 420, and the third linear module 430, the optical detection module 300 can programmably perform spatial linear motion above the workbench 200.

[0060] In some applications, when the circuit board contacts the workbench 200, heat is transferred to the workbench 200. In addition, when the ultraviolet light source 311 is running for a long time, it will also cause the workbench 200 to generate heat radiation, causing the temperature of the workbench 200 to rise. In some embodiments of the present invention, water cooling is used to dissipate heat from the workbench 200, which has high heat dissipation efficiency and avoids the impact of temperature fluctuations of the workbench 200 on the resin plug hole detection. For example, when the temperature is high, the resin will fall off from the hole of the circuit board and adhere to the end surface of the workbench 200. Figure 1 、 Figure 4 and Figure 5 The heat dissipation module 500 includes a water tank 510 and a water pump. The water tank 510 is connected to a water inlet pipe 520 and a water outlet pipe 530. The water inlet pipe 520 and the water outlet pipe 530 are respectively connected to opposite side walls of the workbench 200. A water-cooling chamber is provided inside the workbench 200. The water pump is used to pump water from the water tank 510 to the water inlet pipe 520 and drive the water through the water-cooling chamber and the water outlet pipe 530 to circulate water cooling for the workbench 200, ensuring the stability and accuracy of the test results and extending the service life of the equipment. Furthermore, there are multiple water inlet pipes 520, water outlet pipes 530, and water cooling chambers, and they are arranged in a one-to-one correspondence. The multiple water cooling chambers extend linearly and are set through, and the two ends of the water cooling chambers are respectively connected to the water inlet pipe 520 and the water outlet pipe 530. The rational layout of the water inlet pipe 520, the water outlet pipe 530 and the water cooling chamber ensures efficient operation of the water cooling system, and the evenly distributed cooling effect avoids local overheating, thereby improving the stability of the overall detection environment.

[0061] In some embodiments, there are four water-cooling chambers, arranged in a single row with spacing between them. This has the characteristics of a simple structure, a short flow path, and low flow resistance. Specifically, in the heat dissipation module 500, the heat from the workbench 200 is transferred to the coolant through the heat-conducting material by heat conduction. Therefore, the flow and heat transfer process of the coolant obeys the conservation equations of mass, momentum, and energy, which are expressed as follows:

[0062] (1)

[0063] (2)

[0064] (3)

[0065] Where:

[0066] is the density of the coolant, in kg / m 3 ;

[0067] is the specific heat capacity of the coolant, in J / (kg·K);

[0068] is the flow rate of the coolant, in m / s;

[0069] is the coolant heat transfer coefficient, unit is W / (m 2 K);

[0070] T is temperature, in °C;

[0071] t is time, unit is s.

[0072] The energy conservation equation for the heat transfer process of workbench 200 is:

[0073] (4)

[0074] Where:

[0075] is the density of the workbench 200, in kg / m 3 ;

[0076] is the specific heat capacity of the workbench 200, in J / (kg·K);

[0077] is the thermal conductivity of the workbench 200, in W / (m 2 ·K).

[0078] The following governing equations exist at the fluid-solid interface of the liquid cooling system:

[0079] (5)

[0080] Where:

[0081] is the temperature of the wall surface of the workbench 200 at the fluid-solid interface, in °C;

[0082] is the fluid temperature at the fluid-solid interface, in °C;

[0083] Convective heat transfer coefficient at the fluid-solid interface, unit is W / (m 2 K);

[0084] Industrial UV lamps have a power range of 30W to 200W per centimeter, while ultra-high-power UV lamps can reach 200W per centimeter or more. When inspecting resin plug holes, the UV lamp power should be strong enough to penetrate the resin and inspect the inside of the hole. The specific power will depend on the thickness and transparency of the resin, as well as the depth of the hole.

[0085] Based on computational fluid dynamics software, a steady-state numerical solution of the workbench 200 was performed, and the turbulence model was used for the calculation. According to experimental tests, the heating power of a single UV lamp is 80 W, and the heating power of a single module is 150 W. In order to save computing resources, the heat source of the UV lamp is simplified to the heat flux density boundary on the surface of the thermal conductive material. Water is selected as the coolant, the initial temperature of the system is set to 25 °C, the flow rate is 1.2~6.5L / min, and the pressure outlet is 0 Pa. During the calculation process, it is assumed that the outer surface of the entire liquid cooling unit is in an adiabatic state.

[0086] After simulation calculation, when the flow rate is 3 L / min, all the heat generated by the ultraviolet light source 311 is discharged by the coolant.

[0087] Furthermore, there is a corresponding relationship between flow rate, flow velocity, and pipe diameter, where flow rate = π × (pipe diameter / 2)² × water flow velocity. In some embodiments, the diameter of the water cooling chamber is selected to be 6 mm.

[0088] In some applications, to improve heat dissipation, the flow rate can be controlled by controlling the flow rate of the water pump. In specific applications, the machine base 100 is equipped with a first temperature sensor and a second temperature sensor. The first temperature sensor is used to detect the temperature of the workbench 200, and the second temperature sensor is used to detect the temperature above the workbench 200. The temperature above the workbench 200 is a combination of the ambient workshop temperature, the temperature changes above the workbench 200 caused by heat released by the workbench 200, and the temperature changes above the workbench 200 caused by circuit boards placed behind the workbench 200.

[0089] After collecting a large amount of experimental data and performing linear regression, we derived a control equation for water flow velocity, further simplifying the heat dissipation control operation. For example, let the measurement value of the first temperature sensor be T1, the measurement value of the second temperature sensor be T2, the water flow velocity be y, and the workshop ambient temperature be T3.

[0090] In the specific design, three variables, y, T1, and (T2-T1), are set. By changing the water flow rate, the temperature of the workbench 200 reaches the workshop ambient temperature within 5 minutes. A large number of scatter plots are obtained, and linear regression is performed on them to obtain the control equation of the water flow rate:

[0091] (6)

[0092] Goodness of fit R 2 If it is greater than 0.7, the fitting effect is good.

[0093] Where:

[0094] y is the water outlet flow rate of the pump, in m / s;

[0095] T1 is the temperature of the workbench 200, in °C;

[0096] (T2-T1) is the difference between the temperature above the workbench 200 and the temperature of the workbench 200, and the unit is °C.

[0097] Refer again Figure 4 and Figure 5In some embodiments of the present invention, the machine base 100 is connected to a collection box 120, which is located below the end surface of the workbench 200. The collection box 120 is located on the side where the scraper bar 620 moves to scrape away dirt. The cleaning module 600 includes a drive cylinder 630, which is connected to and drives the scraper bar 620 to move toward the end surface of the workbench 200 and press the scraper bar 620 against the end surface of the workbench 200. For more difficult-to-clean dirt, such as resin leaked from a circuit board, the scraper bar 620 is tilted downward and forms an angle with the end surface of the workbench 200, scraping the dirt into the collection box 120, preventing ink from dripping onto the ground and causing environmental contamination. Furthermore, for easier-to-clean debris, such as dust and waste from circuit boards, the scraper 620 is connected to an air blower 621. This blower 621 is located on the side of the scraper 620 that scrapes the debris, with the air side of the air blower 621 facing downward, blowing the debris to the ground. Furthermore, when the second drive assembly 610 drives the scraper 620 above the collection box 120, the air blower 621 blows air into the scraper 620, helping the resin drip quickly into the collection box 120 and preventing residual resin from contaminating the workbench 200 during the scraper 620's return stroke. Furthermore, the drive cylinder 630 can drive the scraper 620 upward to disengage from the end surface of the workbench 200, further preventing contact with the workbench 200 during the return stroke. In some specific connection structures, the cleaning module 600 includes a sliding plate 640, which is slidably arranged above the workbench 200 via a guide rail slider structure. The second drive assembly 610 is a motor screw transmission structure. The second drive assembly 610 includes a second transmission block 611 threadedly connected to the screw, and the second transmission block 611 is fixedly connected to the sliding plate 640. The second drive assembly 610 connects and drives the second transmission block 611 and the sliding plate 640 to move linearly together. In addition, the cleaning module 600 also includes a connecting plate 641 and a guide post 642. The sliding plate 640 and the connecting plate 641 are fixedly connected via a vertical post. The guide post 642 is arranged vertically, and the connecting plate 641 and the scraper 620 are slidably connected via the guide post 642. The driving cylinder 630 is mounted on the connecting plate 641, and the drive shaft of the driving cylinder 630 is fixedly connected to the scraper 620 to drive the scraper 620 to move in the vertical direction.

[0098] It should be noted that the cleaning module 600 cleans the end surface of the workbench 200, and the heat dissipation module 500 dissipates heat from the workbench 200. However, the degree of cleanliness of the surface of the workbench 200 depends in part on the amount of dirt remaining on the circuit board, which in turn depends in part on the temperature of the workbench 200. Therefore, in some applications, the heat dissipation module 500 and the cleaning module 600 operate in conjunction. When the temperature of the workbench 200 is less than 35°C, the cleaning module 600 cleans every 60 minutes; when the temperature of the workbench 200 is between 35°C and 40°C, the cleaning module 600 cleans every 30 minutes; and when the temperature of the workbench 200 is greater than 40°C, the cleaning module 600 cleans every 10 minutes. It is easy to understand that the temperature of the water in the water tank 510 is affected by the working environment temperature of the workshop. The water cooling effect of the heat dissipation module 500 on the workbench 200 is to reduce the workbench 200 to a temperature close to or slightly lower than the working environment temperature of the workshop. Therefore, the actual temperature of the workbench 200 is correlated with the working environment temperature of the workshop.

[0099] Refer again Figure 1 and Figure 6 In some embodiments of the present invention, the workbench 200 is sealed with a gas exchange cover 210. For example, the gas exchange cover 210 is connected to the bottom wall of the workbench 200 via a sealing ring, or the periphery of the gas exchange cover 210 is fixed to the workbench 200 via a sealant. Specifically, the gas exchange cover 210 is located below the vent 201, and multiple vents 201 are connected to the gas exchange cover 210. The gas exchange cover 210 is provided with ventilation holes 2101, and the ventilation holes 2101 and the vacuum generator 110 form a vacuum air path to adsorb the circuit board. In addition, according to the commonly used air path design, the ventilation holes 2101 are connected to an outlet pipe and form an outlet air path with the outlet pipe to drive the circuit board to separate from the workbench 200 and blow out the dirt in the ventilation holes 2101. It should be noted that the vacuum air circuit formed by the gas exchange cover 210 and the vacuum generator 110, as well as the accompanying exhaust air circuit, not only ensures the secure adsorption of the circuit board during testing, but also facilitates its rapid release, improving the smoothness and safety of the testing process. Furthermore, the outward blowing of air not only removes dirt from the vent holes 201 but also cools the workbench 200, further improving its cleaning and heat dissipation.

[0100] In order to protect operators from ultraviolet radiation, isolate external interference, and ensure the safety and stability of the testing environment. Figure 7In some embodiments of the present invention, the workbench 200 is slidably mounted on the machine base 100 via a guide rail slider structure. The machine base 100 is equipped with an ultraviolet protection curtain 130 and a linear drive assembly 140. The two sides of the ultraviolet protection curtain 130 are respectively the inspection station and the loading station. The linear drive assembly 140 is connected and drives the workbench 200 to reciprocate between the inspection station and the loading station, thereby achieving fully automated operation of circuit board inspection, reducing manual intervention, and improving inspection efficiency and production rhythm. Specifically, the linear drive assembly 140 is a motor screw transmission structure. The linear drive assembly 140 includes a first transmission block 141 threadedly connected to the screw. The first transmission block 141 is fixedly connected to the workbench 200. The first drive assembly 400 is connected and drives the first transmission block 141 and the workbench 200 to move linearly together.

[0101] In addition, in some applications, robots are used for automatic loading. Figure 8 A six-axis robot 800 is installed on the outside of the machine base 100. The arm span of the six-axis robot 800 is sufficient to operate the circuit boards at the loading station, realizing fully automated operation of circuit board loading and testing, reducing manual intervention and improving production cycle time. It is easy to understand that the six-axis robot 800 relies on its repeatable positioning accuracy to ensure that the position of each circuit board placed on the workbench 200 is constant. After placement, the circuit board can be directly fixed by switching to a vacuum air path for adsorption. Next, the circuit board is moved to the inspection station for inspection via the linear drive assembly 140.

[0102] In some applications, the resin via inspection machine with re-inspection function can connect different processes of PCB via plugging.

[0103] For example, after plugging a via, a circuit board is placed directly on the workbench 200 for inspection. At this time, the dirt that falls on the end surface of the workbench 200 is mainly resin. While the ultraviolet light source 311 is inspecting it, the ultraviolet light can also cure the resin. In this regard, the scraper 620 mainly scrapes away the resin adhering to the end surface of the workbench 200.

[0104] For another example, after the plugged holes are filled, the circuit board is baked and ground and then placed on the workbench 200 for inspection. The temperature of the circuit board after the grinding process is relatively high. At this time, the dirt dropped on the end surface of the workbench 200 is mainly waste plastic particles attached to the circuit board after grinding. In this regard, the air blower 621 mainly blows away the waste plastic particles adhering to the end surface of the workbench 200, and the scraper 620 can also scrape away the waste plastic particles adhering to the end surface of the workbench 200.

[0105] Refer again Figure 9 According to the detection method of the embodiment of the present invention, applied to the resin plug hole detection machine with re-inspection function of the embodiment of the present invention, the following steps are included:

[0106] S100, placing and fixing the board: placing the circuit board on the end surface of the workbench 200, and using the vacuum generator 110 to generate negative pressure in the vent holes 201 to fix the circuit board by suction;

[0107] S200, detecting plugged via defects: After the board is placed and fixed, the first drive assembly 400 drives the light detection module 300 to move horizontally, causing the ultraviolet light source 311 to emit light. The ultraviolet light will appear fluorescent after passing through the photosensitive resin. Then, the camera 330 captures the image and analyzes the degree of fluorescence difference in the plugged via area of the circuit board to determine the plugged via blockage condition;

[0108] S300, heat dissipation treatment: After the board is placed and fixed, the heat dissipation module 500 is operated to dissipate heat from the workbench 200;

[0109] S210, take out the board: after detecting the plug hole defect, if the plug hole is qualified, take out the circuit board and put it into the qualified frame;

[0110] S220, re-inspection: after detecting the plug hole defect, if the plug hole detection fails, re-inspect the plug hole defect of the circuit board;

[0111] S400 , cleaning process: After taking out the board or re-inspecting, the cleaning module 600 is operated, and the scraper 620 scrapes away the dirt on the end surface of the workbench 200 .

[0112] According to the detection method of an embodiment of the present invention, the circuit board is fixed by using vacuum adsorption, which enhances the stability of the detection process, and the combination of the ultraviolet light source 311 and the camera 330 can efficiently identify plugging defects and provide detailed detection results. At the same time, the heat dissipation treatment ensures the temperature stability of the detection environment, which is conducive to maintaining the physical and chemical properties of the resin, thereby ensuring the reliability of the detection; and the board removal and re-inspection steps distinguish between qualified and unqualified products, ensuring the screening of high-quality circuit boards. Finally, the cleaning treatment ensures the cleanliness of the workbench 200, reduces the potential contamination of subsequent detection, extends the life of the equipment, and greatly improves the efficiency, accuracy and reliability of the circuit board resin plugging detection.

[0113] Other structures and operations of the detection method according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0114] Refer again Figure 10, according to the detection system of the embodiment of the present invention, the resin plug hole detection machine with re-inspection function applied to the embodiment of the present invention includes an acquisition module, a storage end, a comparison module, an analysis module, a client and a server, wherein the acquisition module is used to acquire ultraviolet fluorescence images of the circuit board to be inspected. The storage end includes multiple ultraviolet fluorescence images of qualified circuit boards and multiple types of ultraviolet fluorescence images of unqualified circuit boards. The comparison module is used to perform feature comparison between the image collected by the acquisition module and the image in the storage end. The analysis module is used to analyze the comparison information output by the comparison module to form a detection suggestion. The client is used to receive and view the collected images, images participating in the comparison of the collected images and the detection suggestions. The server is used to connect to the acquisition module and the storage end network to upload or download images from the acquisition module or the storage end.

[0115] The specific process is as follows:

[0116] The contrast module divides the input captured image into blocks so that each block forms a feature image;

[0117] The captured image input by the acquisition module is compared with the qualified image in the storage end. If the similarity reaches 1, the analysis module outputs the detection recommendation "Plugging hole quality: completely qualified". If the similarity is less than 1, the feature image is compared with the qualified image. If the similarity of all feature images is above 0.9, the analysis module outputs the detection recommendation "Plugging hole quality: basically qualified". If the similarity of any feature image is less than 0.9, the system enters the deep comparison.

[0118] In the deep comparison, the comparison module divides the input unqualified image into blocks so that each block forms a sample image. All feature images of the acquired image are compared with the corresponding blocks of all sample images of the unqualified image, and the similarity of the feature images is calculated based on the features.

[0119] If the similarity between the feature image and the sample image is low, the captured image of the feature image is output and all feature areas are marked. The analysis module calculates the probability and outputs the inspection suggestion "Plugging hole quality: may be qualified, manual re-inspection recommended" and outputs the result to the client.

[0120] If the similarity between the feature image and the sample image is high, the analysis module calculates the probability and outputs a detection suggestion "plugging quality: unqualified", and outputs the result to the client.

[0121] According to the detection system of the embodiment of the present invention, it is possible to automatically collect ultraviolet fluorescence images of the circuit board to be inspected, and intelligently compare them with a large number of images of qualified and unqualified circuit boards that have been inspected, and output detailed detection suggestions through the analysis module, which not only greatly improves the detection efficiency but also ensures the objectivity and accuracy of the detection results; moreover, the system also has a deep comparison capability, which can accurately identify complex or subtle defects, and calculate the similarity and output the probability by comparing the feature image with the sample image, to assist manual re-inspection or directly determine the quality of the plug hole, thereby reducing misjudgments and missed judgments; in addition, the network connection between the client and the server realizes remote access and management of the detection data, promotes the real-time nature of production monitoring and the efficiency of decision-making, and significantly improves the intelligence level and quality control capability of the circuit board resin plug hole detection.

[0122] Other structures and operations of the detection system according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail here.

[0123] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the scope of the present invention.

Claims

1. Resin plug hole inspection machine with re-inspection function, characterized by: include: base; A workbench for placing a circuit board, the workbench being connected to the machine base, the end surface of the workbench being provided with a plurality of ventilation holes, the ventilation holes being connected to a vacuum generator to adsorb and fix the circuit board; the workbench being sealedly connected to a gas exchange cover, the gas exchange cover being located below the ventilation holes, the plurality of ventilation holes being communicated with the gas exchange cover, the gas exchange cover being provided with ventilation holes, the ventilation holes and the vacuum generator forming a vacuum air path to adsorb the circuit board; the ventilation holes being further connected to an air outlet pipe and forming an air outlet air path with the air outlet pipe to drive the circuit board to separate from the workbench and blow out dirt in the ventilation holes; a light detection module connected to the machine base and located above the workbench, the light detection module comprising a light board, a polarizing plate and a camera; the light board being a hollow structure, the camera, the polarizing plate and the hollow portion of the light board being in the same straight line; the light board being provided with a plurality of ultraviolet light sources, the irradiation side of the ultraviolet light source being directed toward the workbench; the polarizing plate being located on the photographic side of the camera to receive light reflected from the circuit board and emit light to the camera; the light board being further provided with a white light source, which cooperates with the camera to re-inspect the circuit board after the ultraviolet light source detection is completed; A first driving assembly, connected to and driving the light detection module to move linearly in a plane parallel to the end surface of the workbench; a heat dissipation module connected to the workbench and used to dissipate heat from the workbench, the heat dissipation module comprising a water tank and a water pump, the water tank being connected to a water inlet pipe and a water outlet pipe, the water inlet pipe and the water outlet pipe being respectively connected to opposite side walls of the workbench, a water-cooling chamber being provided inside the workbench, the water pump being used to pump water from the water tank to the water inlet pipe, and driving the water to flow through the water-cooling chamber and the water outlet pipe, so as to circulate water and cool the workbench; a plurality of the water inlet pipe, the water outlet pipe and the water-cooling chamber are provided and arranged in a one-to-one correspondence, a plurality of the water-cooling chambers extending linearly and being arranged through, and two ends of the water-cooling chamber being respectively connected to the water inlet pipe and the water outlet pipe; The cleaning module is connected to the machine base, and the cleaning module includes a second driving assembly and a scraping bar, the scraping bar abuts and cooperates with the end surface of the workbench, the second driving assembly is connected and drives the scraping bar to move in a horizontal direction, and the scraping bar abuts against the end surface of the workbench to scrape off dirt on the end surface of the workbench; the cleaning module also includes a driving cylinder, which is connected and drives the scraping bar to move along a side toward the end surface of the workbench and drives the scraping bar to press against the end surface of the workbench, the machine base is connected to a collection box, the collection box is located on the side where the scraping bar moves along the scraping dirt, the scraping bar is tilted downward and forms an angle with the end surface of the workbench, the scraping bar is connected to an air blowing pipe, the air blowing pipe is located on the side where the scraping bar moves along the scraping dirt, and the blowing side of the air blowing pipe is arranged downward; A control system is provided for integratedly controlling the light detection module, the first driving component, the heat dissipation module and the cleaning module. The control system includes a display screen for displaying the image of the camera.

2. The resin plug hole inspection machine with re-inspection function according to claim 1, characterized in that: The base is equipped with a third driving assembly, which is connected to and drives the camera to move in a vertical direction to adjust the distance between the camera and the end surface of the workbench.

3. The resin plug hole inspection machine with re-inspection function according to claim 1, characterized in that: The workbench is slidably arranged on the machine base, and the machine base is equipped with an ultraviolet protection curtain and a linear drive component. The two sides of the ultraviolet protection curtain are respectively the detection station and the loading station. The linear drive component connects and drives the workbench to reciprocate between the detection station and the loading station.

4. A detection method, applied to the resin plug hole detection machine with re-inspection function according to any one of claims 1 to 3, characterized in that: The following steps are included: Place the board and fix it: Place the circuit board on the end surface of the workbench, and use the vacuum generator to generate negative pressure in the vents to fix the circuit board; Detecting plugged hole defects: After the board is placed and fixed, the first drive assembly drives the light detection module to move horizontally. The ultraviolet light source emits light, and the ultraviolet light will appear fluorescent after passing through the photosensitive resin. Then, the camera captures the image and analyzes the degree of fluorescence difference in the plugged hole area of the circuit board to determine the plugged hole blockage condition; Heat dissipation: After the board is placed and fixed, run the heat dissipation module to dissipate heat from the workbench; Take out the board: After inspecting the plug hole defects, if the plug hole inspection is qualified, take out the circuit board and put it into the qualified frame; Re-inspection: After detecting the plug hole defect, if the plug hole detection fails, re-inspect the plug hole defect of the circuit board; Cleaning: After taking the board or re-inspection, run the cleaning module and use the scraper to scrape off the dirt on the end surface of the workbench.

5. A detection system, applied to the resin plug hole detection machine with re-inspection function according to any one of claims 1 to 3, characterized in that: Includes acquisition module, storage terminal, comparison module, analysis module, client and server; The acquisition module is used to acquire the ultraviolet fluorescence image of the circuit board to be inspected; The storage end includes a plurality of ultraviolet fluorescent images of qualified circuit boards and multiple types of ultraviolet fluorescent images of unqualified circuit boards; The comparison module is used to compare the features of the image collected by the collection module with the image in the storage end; The analysis module is used to analyze the comparison information output by the comparison module to form a detection suggestion; The client is used to receive and view the collected images, images participating in the collected image comparison, and detection suggestions; The server is used to connect to the acquisition module and the storage end network to upload or download images from the acquisition module or the storage end; Also includes the following features: The comparison module cuts the input acquired image into blocks and partitions so that each partition forms a feature image; The captured image input by the acquisition module is compared with the qualified image in the storage end. If the similarity reaches 1, the analysis module outputs a detection suggestion of "plugging hole quality: completely qualified". If the similarity is less than 1, the feature image is compared with the qualified image. If the similarity of all feature images is greater than 0.9, the analysis module outputs a detection suggestion of "plugging hole quality: basically qualified". If the similarity of any feature image is less than 0.9, the system enters the deep comparison process. In the depth comparison, the comparison module divides the input unqualified image into blocks so that each block forms a sample image, compares all feature images of the collected image with the blocks corresponding to all sample images of the unqualified image, and calculates the similarity of the feature images based on the features; If the similarity between the feature image and the sample image is low, the captured image of the feature image is output and all feature areas are marked. The analysis module calculates the probability and outputs the inspection suggestion "plugging hole quality: possibly qualified, manual re-inspection recommended" and outputs the result to the client. If the similarity between the feature image and the sample image is high, the analysis module calculates the probability and outputs a detection suggestion "hole plugging quality: unqualified", and outputs the result to the client.

Images