Resin plug hole detection machine with reinspection function, detection method and detection system

Abstract

The invention discloses a resin plug hole detection machine with a reinspection function, a detection method and a detection system, and the machine comprises a workbench which is used for fixing a circuit board; the light detection module comprises a lamp panel, a polaroid and a camera, the lamp panel is provided with a white light source and an ultraviolet light source, and the polaroid can receive light reflected by the circuit board and emit light to the camera; the ultraviolet light source and the white light source are respectively matched with the camera to detect and recheck the circuit board; the first driving assembly drives the light detection module to move; the heat dissipation module is used for dissipating heat of the workbench; the cleaning module is used for scraping dirt on the end face of the workbench; the control system integrating the modules comprises an image display screen for displaying the camera. An ultraviolet light source is used for detecting the quality of the plug hole, a white light source is used for reinspection, and high-precision and high-efficiency detection of the resin plug hole of the circuit board is realized in combination with vacuum adsorption fixation, heat dissipation and cleaning of the workbench and an intelligent image analysis technology.

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 manufacturing process of circuit boards, resin plugging is the core process to ensure the electrical connection between layers and the structural stability of multi-layer circuit boards. The quality of resin plugging is directly related to the performance and reliability of the circuit board. Any minor defects, such as incomplete filling, bubbles in the hole, resin overflow or uncured, will affect the signal transmission efficiency and moisture resistance of the circuit board, and thus lead to an increase in the failure rate of electronic products. Therefore, the detection of resin plugging is an indispensable and important part of the PCB manufacturing process.

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

[0004] 1. Limitations and subjectivity of manual inspection, low efficiency and high cost: Traditional manual visual inspection methods rely heavily on manpower, have slow inspection speeds, and cannot meet the needs of high-efficiency, mass production in the modern electronics manufacturing industry, and labor costs continue to rise. In addition, manual inspection results are easily affected by factors such as operator experience, vision, and fatigue, and it is difficult to unify the judgment standards between different inspectors, resulting in poor repeatability and consistency of inspection results, which increases the difficulty of product quality control. In addition, manual inspection has limited ability to identify complex defects: Faced with complex types of resin plugging defects, such as bubbles in the hole, uneven resin filling, and poor adhesion to the hole wall, manual inspection is often difficult to accurately identify and quantify, which affects the in-depth analysis of defects and the formulation 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 use a single photo and then 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, which leads to a high misjudgment rate in production.

[0006] 3. The influence of temperature on resin performance: The physical and chemical properties of 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 may cause thermal damage to the resin material due to its strong thermal effect. When used for a long time, 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 of the testing environment: In the prior art, the conveying roller conveying method is commonly used in circuit board testing. When the circuit board is transmitted on the conveying roller, due to the difference in roller diameter, different degrees of wear or unequal installation, the circuit board is prone to shaking, and it is impossible to ensure that the circuit board is in an absolute horizontal plane during testing, which directly affects the focusing accuracy and image clarity of the testing equipment, and thus affects the accuracy of the test results. In addition, the gap and rotation unevenness of the conveying roller cause the position of the circuit board to shift during the transmission process. For detection tasks that require precise position information, such as the depth and position detection of resin plug holes, this position deviation will have a significant impact and reduce the detection efficiency and reliability. In addition, the friction between the circuit board and the conveying roller may cause damage to the surface of the circuit board, especially for circuit boards that have completed surface treatment, slight scratches may also affect the final product quality. In the detection of resin plug holes on circuit boards, the above problems are particularly prominent, because the detection of resin plug holes requires extremely high accuracy and consistency, and any slight shaking or position deviation may cause distortion of the test results. For example, the non-horizontal state of the circuit board will change the incident angle of the light, affecting the irradiation effect of the detection light on the resin plug hole, thereby interfering with the identification of defects inside the plug hole. In addition, the unstable state of the circuit board during the inspection process may introduce additional noise, reducing the accuracy and reliability of image analysis.

[0008] In summary, the existing technology has significant limitations and shortcomings in the detection of resin plugging 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 plugging quality control. Summary of the invention

[0009] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a resin plugging hole detection machine with a re-inspection function, which innovatively combines vacuum adsorption fixation, precision light detection module, automatic drive component and intelligent image analysis technology to achieve high-precision and high-efficiency detection of circuit board resin plugging holes.

[0010] The present invention also proposes 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] Machine base;

[0013] A workbench, used for placing a circuit board, the workbench is connected to the machine base, a plurality of ventilation holes are arranged on the end surface of the workbench, the ventilation holes are connected to a vacuum generator to adsorb and fix the circuit board; a gas exchange cover is sealedly connected to the workbench, the gas exchange cover is located below the ventilation holes, a plurality of ventilation holes are communicated with the gas exchange cover, the gas exchange cover is provided with ventilation holes, the ventilation holes and the vacuum generator form a vacuum air path to adsorb the circuit board; the ventilation holes are also connected to an air outlet pipe and form 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 is connected to the machine base and is located above the workbench. The light detection module includes a light board, a polarizing plate and a camera. The light board is a hollow structure. The camera, the polarizing plate and the hollow part of the light board are in the same straight line. The light board is provided with a plurality of ultraviolet light sources. The irradiation side of the ultraviolet light source faces the workbench. The polarizing plate is located on the photographing side of the camera to receive the light reflected by the circuit board and emit light to the camera. The light board is also provided with a white light source. The white light source cooperates with the camera to re-inspect the circuit board.

[0015] A first driving component, connected to and driving the optical 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 arranged inside the workbench, the water pump being used to pump water from the water tank to the water inlet pipe, and driving water to flow through the water cooling chamber and the water outlet pipe, so as to circulate water cooling for the workbench; the water inlet pipe, the water outlet pipe and the water cooling chamber are all provided in plurality and arranged in one-to-one correspondence, the plurality of water cooling chambers are linearly extended and through-arranged, and the two ends of the water cooling chamber are respectively connected to the water inlet pipe and the water outlet pipe;

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

[0018] A control system is used to integrate and control the light detection module, the first driving component, the heat dissipation module and the cleaning module. The control system includes a display screen to display 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. Accurate defect detection and low heat generation: UV light has the property of exciting photosensitive resin to produce fluorescence, which enables UV light to effectively penetrate the resin and reveal hidden defects such as tiny pores, cracks or insufficiently filled areas. Compared with infrared light, the thermal effect of UV light is relatively small, but its energy density is high, which means that during the inspection process, UV light will not cause significant heating to the circuit board, resin, or workbench like infrared light, thereby avoiding resin deformation, viscosity changes or other thermal damage caused by increased temperature, ensuring the stability of the inspection process and the reliability of the results. In addition, compared with infrared light, the energy density of UV light is high, which means that smaller resin plug holes can be found during the inspection process, 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 of 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 to be re-inspected for manual judgment based on the position point obtained by the detection, thereby improving the efficiency of re-inspection.

[0022] 3. Accurate 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 positional deviation of the circuit board in the traditional conveying method, 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 ultraviolet light source and high-resolution camera, assisted by polarizing film technology, which can capture and clearly present detailed images of the resin plugging area of ​​the circuit board. It can be combined with advanced AI detection system to automatically identify and classify various complex defect types including but not limited to leaking, cracking of sealing green oil, protrusion and depression of sealing green oil, insufficient sealing depth, plugging of offset holes, red hole mouth, etc., greatly improving the detection efficiency and accuracy.

[0024] 5. Automated drive and flexibility: The first drive component ensures that the optical detection module performs precise linear motion in a plane parallel to the end surface of the workbench, and with precise image acquisition and analysis, the detection process is highly automated. In addition, the system can flexibly adjust the detection parameters according to the size of the circuit board and the detection requirements, which enhances the versatility and adaptability of the detection machine.

[0025] 6. Temperature control and stability guarantee: The addition of the heat dissipation module effectively controls the temperature of the workbench through the water cooling circulation system composed of a water tank and a water pump, avoids the fluctuation of resin performance caused by temperature changes, and ensures the consistency of the test conditions and the reliability of the 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 driving component, and the third driving component is connected to and drives the camera to move in the vertical direction to adjust the distance between the camera and the end surface 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, and the two sides of the ultraviolet protection curtain are respectively an inspection station and a loading station, and the linear drive assembly is connected to and drives 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 plugging 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 plugging 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, and then the camera captures the image, analyzes the degree of fluorescence difference in the plugging hole area of ​​the circuit board, to determine the blockage of the plugging hole; heat dissipation treatment: after placing the board and fixing it, run the heat dissipation module to dissipate heat for the workbench; take the board: after detecting the plugging hole defects, if the plugging hole is qualified, take the circuit board and put it into the qualified frame; review: after detecting the plugging hole defects, if the plugging hole is unqualified, review the plugging hole defects of the circuit board; cleaning treatment: after taking the board or reviewing, run the cleaning module, and use the scraper to scrape 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 the 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 review steps distinguish between qualified and unqualified products, ensuring the screening of high-quality circuit boards. Finally, the cleaning process 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 described in the present invention, it is applied to the resin plug hole detection machine with re-inspection function described in 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 the ultraviolet fluorescence image of the circuit board to be detected; the storage end includes multiple ultraviolet fluorescence images of qualified circuit boards that have been detected and multiple types of ultraviolet fluorescence images of unqualified circuit boards; the comparison module is used to perform feature comparison between the acquired image of 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 acquired image, the image participating in the comparison of the acquired image 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 divides the input acquired image into blocks and partitions so that each partition forms a feature image; the acquired 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 a detection suggestion "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 a detection suggestion "plugging hole quality: basically qualified", if one of the feature images has a similarity 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 feature images of the acquired image with the partitions corresponding to all sample images of the unqualified image separately, and calculates the similarity of the feature images according to the features; if the similarity between the feature image and the sample image is low, the acquired image of the feature image is output and all feature areas are marked, the analysis module calculates the probability and outputs the detection suggestion "plugging hole quality: may be qualified, manual review 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 the detection suggestion "plugging hole quality: unqualified", and outputs the result to the client.

[0031] The detection 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 detected, and intelligently compare them with a large number of images of qualified and unqualified circuit boards that have been detected, 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; 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 review or directly determine the quality of the plugging hole, thereby reducing misjudgment and missed judgment; 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 plugging hole detection.

[0032] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through 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 easily understood from the description of the embodiments in conjunction with the following drawings, in which:

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

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

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

[0040] Figure 7 An exploded view of a linear drive assembly of a resin plug hole detection 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] Fig. 9 is a flow chart of a detection method according to an embodiment of the present invention;

[0043] Fig.10 The figure is a flow chart 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 hole 201; gas exchange cover 210; vent hole 2101;

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

[0048] A first driving assembly 400; a first linear module 410; a second linear module 420; and a 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 driving assembly 610; second transmission block 611; scraper bar 620; air blowing pipe 621; driving cylinder 630; sliding plate 640; connecting plate 641; guide column 642;

[0051] Display screen 700;

[0052] Six-axis robot 800. DETAILED DESCRIPTION

[0053] Embodiments of the present invention are described in detail below, examples of which 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 only used to explain the present invention, and cannot be understood 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., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and 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, and therefore should not be understood as a limitation on the present invention.

[0055] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0056] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. 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, the description with reference to the terms "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 schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0058] like Figures 1 to 8As shown, the resin plug hole detection 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 connected to and driving the light detection module 300 to perform a planar linear motion parallel to the end face of the workbench 200, a heat dissipation module 500 connected to the workbench 200 and used for dissipating the workbench 200, a cleaning module 600 connected to the machine base 100 and used for cleaning 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 the circuit board. The end surface of the workbench 200 is provided with a plurality of vents 201. The vents 201 are connected to the vacuum generator 110 to adsorb and fix the circuit board, ensuring that the circuit board is stable and motionless during the detection process, avoiding the detection error caused by the movement of the circuit board. In addition, compared with directly placing it flat on the workbench 200, the fixing method of adsorbing and fixing the circuit board can make the end surface of the circuit board close to the workbench 200, further improve the flatness of the circuit board, and reduce the local errors in the subsequent photographic images that affect the automatic judgment. In addition, the light detection module 300 includes a light board 310, a polarizing plate 320 and a camera 330, wherein the light board 310 is a hollow structure, and the hollow parts of the camera 330, the polarizing plate 320 and the light board 310 are on the same straight line. 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, so as to more accurately detect the internal condition of the resin plug hole and reduce misjudgment and missed judgment. In addition, the cleaning module 600 includes a second driving component 610 and a scraper 620, the scraper 620 is abutted against the end face of the workbench 200, the second driving component 610 is connected and drives the scraper 620 to move in the horizontal direction, and the scraper 620 is abutted against the end face of the workbench 200 to scrape off the dirt on the end face of the workbench 200. The cleaning module 600 can regularly clean the surface of the workbench 200, reduce the influence of dust and other impurities on the detection results, and extend the service life of the equipment. It is easy to understand that the dirt includes dust directly attached to the workbench 200, various wastes transferred to the workbench 200 by adhering to the end surface of the circuit board, and resin leaked from the plug hole of the circuit board to the workbench 200. The method of scraping the end surface of the workbench 200 with the scraper 620 can effectively remove the above-mentioned dirt, keep the end surface of the workbench 200 clean, improve the flatness of the circuit board placed on the workbench 200, and reduce the interference with the light detection module 300 in detecting the plug hole. In particular, in the comparison of the detection system based on big data AI, the lower the volatility of each image, the more accurate the intelligent judgment of AI.In addition to allowing AI to make direct 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 make a direct judgment, the operator can re-check the plug hole on the display screen 700.

[0059] Refer to Figure 2 and Figure 3 , the first driving component 400 includes a first linear module 410 and a second linear module 420 connected in sequence, and the first linear module 410 and the second linear module 420 are arranged perpendicular to each other in a horizontal plane, so that the light detection module 300 can be programmed to move in the x0y plane under the drive of the first driving component 400 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 of 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. It supplements the limitations of the ultraviolet light source 311 detection, ensures a comprehensive quality assessment of the circuit board, and reduces the misjudgment of 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, after the light detection module 300 completes the detection using the ultraviolet light source 311, there is no need to move the circuit board. The operator can directly operate 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 machine base 100 is equipped with a third drive assembly, which is connected to and drives the camera 330 to move in the vertical direction to adjust the distance between the camera 330 and the end face of the workbench 200, so as to adapt to the detection requirements of circuit boards of different thicknesses, improve the versatility and adaptability of the detection system, and be suitable for the detection of circuit boards of various specifications. In particular, during the re-inspection operation, the operator can drive the camera 330 to move through the third drive assembly to enlarge or reduce the area to be re-inspected, so as to better judge the quality of the resin plug hole. Specifically, the third drive assembly includes a third linear module 430, which is vertically arranged and connected to the output end of the second linear module 420, so that, under 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, the heat is transferred to the workbench 200. In addition, when the ultraviolet light source 311 is running for a long time, the workbench 200 will also generate heat radiation, which will cause 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 influence 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 the opposite side walls of the workbench 200. The workbench 200 is provided with a water cooling chamber inside. The water pump is used to pump water from the water tank 510 to the water inlet pipe 520, and drive the water to flow through the water cooling chamber and the water outlet pipe 530, so as to circulate water cooling for the workbench 200, ensure the stability and accuracy of the detection results, and extend the service life of the equipment. Furthermore, there are multiple water inlet pipes 520, water outlet pipes 530 and water cooling chambers, which are arranged one by one. The multiple water cooling chambers extend linearly and are arranged through, and the two ends of the water cooling chamber 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, which are arranged in a single row at intervals, and have the characteristics of simple structure, short flow path, and small flow resistance. Specifically, in the heat dissipation module 500, the heat of the workbench 200 is transferred to the coolant through the heat conductive material in a heat conduction manner. Therefore, the flow heat exchange process of the coolant complies with the mass conservation equation, momentum conservation equation and energy conservation equation, and the expressions are:

[0062]

[0063] Where:

[0064] ρ1 is the density of the coolant, in kg / m 3 ;

[0065] c1 is the specific heat capacity of the coolant, in J / (kg·K);

[0066] ν is the flow rate of the coolant, in m / s;

[0067] k1 is the heat transfer coefficient of the coolant, in W / (m 2 K);

[0068] T is temperature, in °C;

[0069] t is time, unit is s.

[0070] The energy conservation equation for the heat transfer process of workbench 200 is:

[0071]

[0072] Where:

[0073] ρ p is the density of the workbench 200, in kg / m 3 ;

[0074] c p is the specific heat capacity of the workbench 200, in J / (kg·K);

[0075] λ p is the thermal conductivity of the workbench 200, in W / (m 2 ·K).

[0076] The following control equations exist at the fluid-solid interface of the liquid cooling system:

[0077]

[0078] Where:

[0079] T w is the temperature of the wall surface of the workbench 200 at the fluid-solid interface, in °C;

[0080] T f is the fluid temperature at the fluid-solid interface, in °C;

[0081] h is the convection heat transfer coefficient on the fluid-solid interface, in W / (m 2 K);

[0082] Industrial UV lamps have a power of 30W to 200W per centimeter, while ultra-high-power UV lamps can reach 200W per centimeter or more. When used to inspect resin plug holes, the power of the UV lamp 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 and the depth of the hole.

[0083] Based on computational fluid dynamics software, the steady-state numerical solution of workbench 200 is performed, and the turbulence model is used for calculation. According to experimental tests, the heating power of a single UV lamp is 80W, and the heating power of a single module is 150W. 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 0Pa. During the calculation process, it is assumed that the outer surface of the entire liquid cooling unit is in an adiabatic state.

[0084] After simulation calculation, when the flow rate is 3 L / min, the heat generated by the ultraviolet light source 311 is completely discharged by the coolant.

[0085] Furthermore, there is a corresponding relationship between the flow rate, flow velocity and pipe diameter, wherein 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.

[0086] In some applications, in order to improve the heat dissipation effect, the flow rate can be controlled by controlling the flow rate of the water pump. In a specific application, the base 100 is provided 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 the comprehensive workshop ambient temperature, the change of the temperature above the workbench 200 caused by the heat released by the workbench 200, and the change of the temperature above the workbench 200 caused by the circuit board placed behind the workbench 200.

[0087] After collecting a large amount of experimental data and performing linear regression, the control equation of water flow velocity is obtained, which further simplifies the heat dissipation control operation. For example, the measurement value of the first temperature sensor is set to T1, the measurement value of the second temperature sensor is set to T2, the water flow velocity is y, and the workshop ambient temperature is set to T3.

[0088] In the specific design, three variables, y, T1, (T2-T1), are set. By changing the water flow rate, the temperature of the workbench 200 reaches the workshop environment 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:

[0089] y=0.043×T1+0.11×(T2-T1)-0.2 (6)

[0090] Goodness of fit R 2 If it is greater than 0.7, the fitting effect is good.

[0091] Where:

[0092] y is the water flow rate of the pump, in m / s;

[0093] T1 is the temperature of the workbench 200, in °C;

[0094] (T2-T1) is the difference between the temperature above the workbench 200 and the temperature of the workbench 200, in degrees Celsius.

[0095] Refer to Figure 4 and Figure 5In some embodiments of the present invention, the 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 driving cylinder 630, which is connected to and drives the scraper bar 620 to move along the side facing the end surface of the workbench 200, and drives the scraper bar 620 to press against the end surface of the workbench 200. For dirt that is difficult to clean, 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, so as to scrape the dirt into the collection box 120, thereby preventing ink from dripping onto the ground and causing environmental pollution. Furthermore, for dirt that is easier to clean, such as dust and waste carried by circuit boards, the scraper bar 620 is connected to a blow pipe 621, which is located on the side of the scraper bar 620 moving along the scraping dirt, and the blowing side of the blow pipe 621 is arranged downward to blow the dirt to the ground. In addition, when the second drive assembly 610 drives the scraper bar 620 to move above the collection box 120, the blow pipe 621 blows air to the scraper bar 620 to assist the resin to drip quickly into the collection box 120, so as to avoid the residual resin in the return movement of the scraper bar 620 from contaminating the workbench 200. In addition, the drive cylinder 630 can drive the scraper bar 620 to move upward to separate from the end surface of the workbench 200, further avoiding contact with the workbench 200 during the return movement. In some specific connection structures, the cleaning module 600 includes a sliding plate 640, which is slidably arranged above the workbench 200 through a guide rail slider structure, and the second driving assembly 610 is a motor screw transmission structure, and the second driving 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, and the second driving assembly 610 is connected 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 column 642, the sliding plate 640 and the connecting plate 641 are fixedly connected through a vertical column, the guide column 642 is vertically arranged, and the connecting plate 641 and the scraper 620 are slidably connected through the guide column 642. The driving cylinder 630 is installed on the connecting plate 641, and the driving shaft of the driving cylinder 630 is fixedly connected to the scraper 620 to drive the scraper 620 to move in the vertical direction.

[0096] 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 dirt left on the circuit board, and the dirt left on the circuit board depends in part on the temperature of the workbench 200. In this regard, in some applications, the heat dissipation module 500 and the cleaning module 600 cooperate to operate, and when the temperature of the workbench 200 is less than 35°, the cleaning module 600 cleans once every 60 minutes; when the temperature of the workbench 200 is between 35° and 40°, the cleaning module 600 cleans once every 30 minutes; when the temperature of the workbench 200 is greater than 40°, the cleaning module 600 cleans once 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.

[0097] Refer to 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 by a sealing ring, or the periphery of the gas exchange cover 210 is fixed to the workbench 200 by a sealant. Specifically, the gas exchange cover 210 is located below the vent 201, and a plurality of vents 201 are connected to the gas exchange cover 210. The gas exchange cover 210 is provided with a ventilation hole 2101, and the ventilation hole 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 hole 2101 is connected to an air outlet pipe and forms an air outlet air path with the air outlet pipe to drive the circuit board to separate from the workbench 200 and blow out the dirt in the ventilation hole 2101. It should be noted that the vacuum air path formed by the gas exchange cover 210 and the vacuum generator 110, as well as the matching air outlet path, not only ensures the firm adsorption of the circuit board during the detection process, but also facilitates the rapid release of the circuit board, thereby improving the smoothness and safety of the detection process. In addition, blowing air outward can not only blow out the dirt in the vent hole 201, but also cool the workbench 200, further improving the cleaning effect and heat dissipation effect of the workbench 200.

[0098] 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 disposed on the machine base 100 through a guide rail slider structure. The machine base 100 is installed with an ultraviolet protection curtain 130 and a linear drive assembly 140. The two sides of the ultraviolet protection curtain 130 are the detection station and the loading station respectively. The linear drive assembly 140 is connected and drives the workbench 200 to reciprocate between the detection station and the loading station, thereby realizing the fully automated operation of circuit board detection, reducing manual intervention, and improving detection efficiency and production rhythm. Specifically, the linear drive assembly 140 is a motor screw transmission structure, and the linear drive assembly 140 includes a first transmission block 141 threadedly connected to the screw, and 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.

[0099] In addition, in some applications, robots are used for automatic loading, see Figure 8 , a six-axis robot 800 is arranged on the outside of the base 100. The arm span of the six-axis robot 800 can operate the circuit board at the loading station, realizing the fully automated operation of circuit board loading and testing, reducing manual intervention and improving the production rhythm. It is easy to understand that the six-axis robot 800 relies on its repeated positioning accuracy to keep the position of the circuit board on the workbench 200 constant each time, and can directly fix the circuit board by switching to a vacuum air path for adsorption after placement. Then, the circuit board is moved to the detection station for detection through the linear drive assembly 140.

[0100] In some applications, the resin via inspection machine with re-inspection function can connect different processes of circuit board via plugging.

[0101] For example, after plugging the hole, the circuit board is directly placed on the workbench 200 for inspection. At this time, the dirt dropped on the end surface of the workbench 200 is mainly resin. While the ultraviolet light source 311 is inspecting it, the ultraviolet rays can also solidify the resin. In this regard, the scraper 620 mainly scrapes away the resin adhering to the end surface of the workbench 200.

[0102] For another example, after the plugging of the hole, the circuit board is placed on the workbench 200 for inspection after baking and grinding. The temperature of the circuit board after grinding 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 pipe 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.

[0103] Refer to Fig. 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:

[0104] 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 hole 201 to adsorb and fix the circuit board;

[0105] S200, detecting plugging hole defects: After placing and fixing the board, the first driving assembly 400 drives the light detection module 300 to move horizontally, and the ultraviolet light source 311 emits light. After the ultraviolet light passes through the photosensitive resin, it will show fluorescence. Then, the camera 330 takes an image and analyzes the degree of fluorescence difference in the plugging hole area of ​​the circuit board to determine the plugging hole blockage condition;

[0106] 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;

[0107] S210, taking out the board: after detecting the plugging hole defect, if the plugging hole is qualified, take out the circuit board and put it into the qualified frame;

[0108] S220, review: after detecting the plugging hole defect, if the plugging hole detection fails, review the plugging hole defect of the circuit board;

[0109] S400 , cleaning process: after taking out the board or checking, the cleaning module 600 is operated, and the scraper 620 scrapes away the dirt on the end surface of the workbench 200 .

[0110] According to the detection method of the embodiment of the present invention, the stability of the detection process is enhanced by using vacuum adsorption to fix the circuit board, 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 beneficial to maintaining the physical and chemical properties of the resin, thereby ensuring the reliability of the detection; and, the board removal and review steps distinguish between qualified and unqualified products, ensuring the screening of high-quality circuit boards. Finally, the cleaning process ensures the cleanliness of the workbench 200, reduces the potential contamination of subsequent detections, extends the life of the equipment, and greatly improves the efficiency, accuracy and reliability of circuit board resin plugging detection.

[0111] 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.

[0112] Refer to Fig.10, according to the detection system 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, 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 detected. 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 acquired image of 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 acquired images, images participating in the comparison of the acquired images, 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.

[0113] The specific process is as follows:

[0114] The contrast module cuts the input acquired image into partitions so that each partition forms a feature image;

[0115] The acquisition 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 suggestion "hole plugging 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 suggestion "hole plugging quality: basically qualified"; if the similarity of one of the feature images is less than 0.9, the system enters the deep comparison;

[0116] In the deep comparison, the comparison module cuts the input unqualified image into blocks so that each block forms a sample image, compares all feature images of the acquired image with the blocks corresponding to all sample images of the unqualified image separately, and calculates the similarity of the feature images based on the features;

[0117] 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 detection suggestion "hole plugging quality: may be qualified, manual review is recommended", and outputs the result to the client;

[0118] 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.

[0119] The detection system according to the embodiment of the present invention 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 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; 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 review or directly determine the quality of the plugging hole, thereby reducing misjudgment and missed judgment; 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 plugging hole detection.

[0120] 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.

[0121] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. Resin plug hole inspection machine with re-inspection function, characterized in that: include: Machine base; A workbench, used for placing a circuit board, the workbench is connected to the machine base, a plurality of ventilation holes are arranged on the end surface of the workbench, the ventilation holes are connected to a vacuum generator to adsorb and fix the circuit board; a gas exchange cover is sealedly connected to the workbench, the gas exchange cover is located below the ventilation holes, a plurality of ventilation holes are communicated with the gas exchange cover, the gas exchange cover is provided with ventilation holes, the ventilation holes and the vacuum generator form a vacuum air path to adsorb the circuit board; the ventilation holes are also connected to an air outlet pipe and form 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 is connected to the machine base and is located above the workbench. The light detection module includes a light board, a polarizing plate and a camera. The light board is a hollow structure. The camera, the polarizing plate and the hollow part of the light board are in the same straight line. The light board is provided with a plurality of ultraviolet light sources. The irradiation side of the ultraviolet light source faces the workbench. The polarizing plate is located on the photographing side of the camera to receive the light reflected by the circuit board and emit light to the camera. The light board is also provided with a white light source. The white light source cooperates with the camera to re-inspect the circuit board. A first driving component, connected to and driving the optical 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 arranged inside the workbench, the water pump being used to pump water from the water tank to the water inlet pipe, and driving water to flow through the water cooling chamber and the water outlet pipe, so as to circulate water cooling for the workbench; the water inlet pipe, the water outlet pipe and the water cooling chamber are all provided in plurality and arranged in one-to-one correspondence, the plurality of water cooling chambers are linearly extended and through-arranged, and the two ends of the water cooling chamber are respectively connected to the water inlet pipe and the water outlet pipe; The cleaning module is connected to the machine base, the cleaning module includes a second driving assembly and a scraper bar, the scraper bar abuts and cooperates with the end surface of the workbench, the second driving assembly is connected and drives the scraper bar to move in a horizontal direction, the scraper 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, the driving cylinder is connected and drives the scraper bar to move along a side facing the end surface of the workbench, and drives the scraper bar to press against the end surface of the workbench, the machine base is connected with a collection box, the collection box is located on the side where the scraper bar moves along the scraping dirt, the scraper bar is tilted downward and forms an angle with the end surface of the workbench, the scraper bar is connected with an air blowing pipe, the air blowing pipe is located on the side where the scraper bar moves along the scraping dirt, and the blowing side of the air blowing pipe is arranged downward; A control system is used to integrate and control the light detection module, the first driving component, the heat dissipation module and the cleaning module. The control system includes a display screen to display 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 a detection station and a loading station. The linear drive component is connected 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 as claimed in 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; Detection of plugging hole defects: After the board is placed and fixed, the first driving component drives the light detection module to move horizontally, and the ultraviolet light source emits light. After the ultraviolet light passes through the photosensitive resin, it will show fluorescence. Then, the camera takes an image and analyzes the degree of fluorescence difference in the plugging hole area of ​​the circuit board to determine the plugging hole blockage condition; Heat dissipation: After placing and fixing the board, run the heat dissipation module to dissipate heat from the workbench; Take the board: After testing the plugging hole defects, if the plugging hole is qualified, take the circuit board and put it into the qualified frame; Review: After testing the plugging hole defects, if the plugging hole test fails, the plugging hole defects of the circuit board are reviewed; Cleaning: After taking the board or checking, 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 as claimed in any one of claims 1 to 3, characterized in that: It 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 circuit boards that have been inspected as qualified and a plurality of types of ultraviolet fluorescent images of circuit boards that have been inspected as unqualified; 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, and 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 acquisition 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 "hole plugging 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 a detection suggestion "hole 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 depth comparison, the comparison module cuts the input unqualified image into blocks and partitions so that each partition forms a sample image, compares all feature images of the collected image with the partitions corresponding to all 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 feature areas are marked. The analysis module calculates the probability and outputs the detection suggestion "hole plugging quality: may be qualified, manual review 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 "hole plugging quality: unqualified", and outputs the result to the client.

Images