PCB (printed circuit board) detection equipment based on AOI (automatic optical inspection)

Abstract

The invention relates to the technical field of PCB (Printed Circuit Board) detection, in particular to AOI (Automatic Optic Inspection)-based PCB detection equipment, which comprises a conveying device, a position detection module, a first camera, a second camera and an image processing module, the position detection module is in signal connection with the conveying device and is used for detecting the position of the PCB and controlling the conveying device to stop conveying the PCB, and the first camera and the second camera are located above and below the PCB respectively so as to photograph the two faces of the PCB. The image processing module is in signal connection with the first camera and the second camera and used for receiving and processing shot images, and the image processing module is further in signal connection with the position detection module and used for notifying the position detection module to issue an instruction for continuing to convey the PCB to the conveying device. The method has the advantages that the detection efficiency is improved, the labor cost is reduced, and the production quality is controllable and traceable.

Description

Technical Field

[0001] This application relates to the technical field of PCB board detection, and particularly to a PCB board detection device based on AOI. Background Art

[0002] With the rapid development of the electronic manufacturing industry, as an important part of modern electronic products, the production quality and process level of PCB boards directly affect the performance and reliability of products. In the production process, the quality inspection and information traceability links are particularly important. The traditional manual visual inspection combined with manual entry method has been gradually phased out, and automated and efficient detection devices have become an important trend in the industry's development. Especially after SMT chip processing, AOI (Automated Optical Inspection) devices are widely used because they can accurately detect defects on PCB boards, providing strong guarantee for production quality control.

[0003] Currently, common means in the field of PCB board AOI detection include single-sided scanning devices and traditional methods that use industrial cameras to perform image stitching through mobile photographing. These technologies mainly rely on manpower or simple automated tools to complete detection tasks. For example, although the single-sided scanning device has achieved partial automation, there are still problems with limited detection range; while the method of using industrial cameras to take segmented photos and then stitch them into a complete image improves the detection accuracy but still lacks in efficiency. Moreover, the single-sided scanning device cannot identify two-dimensional codes, and the technical solution of segmented photographing and then stitching is easily affected by the stitching quality, resulting in the failure of two-dimensional code recognition, thus showing deficiencies in ensuring data integrity. Summary of the Invention

[0004] In order to improve the detection efficiency and achieve the effect of controllable and traceable production quality while reducing labor costs, this application provides a PCB board detection device based on AOI.

[0005] The PCB board detection device based on AOI provided by this application adopts the following technical solution: A PCB board detection device based on AOI includes a conveying device, a position detection module, a first camera and a second camera arranged vertically, and an image processing module. The conveying device is used to convey the PCB board. The position detection module is signal-connected to the conveying device to detect the position of the PCB board and control the conveying device to pause the conveyance of the PCB board. The first camera and the second camera are respectively located above and below the PCB board to take photos of both sides of the PCB board. The image processing module is signal-connected to the first camera and the second camera to receive and process the captured images. The image processing module is also signal-connected to the position detection module to notify the position detection module to issue an instruction to the conveying device to continue conveying the PCB board.

[0006] By adopting the above technical solution, this solution can ensure the precise positioning of the PCB board during the detection process, thus guaranteeing the accuracy of double-sided synchronous photographing. At the same time, the image processing module not only completes the basic functions of image reception and processing, but also can cooperate with the position detection module to achieve a smooth connection of the detection process, effectively avoiding operation errors caused by manual intervention. The full-automatic detection and information processing of the PCB board are realized, significantly improving the automation degree and reliability of the detection process.

[0007] Optionally, the conveying device includes a frame, a fixed conveying component, a moving conveying component, and a fixed driving component. The fixed conveying component and the fixed driving component are fixedly connected to the frame. The fixed driving component is used to drive the moving conveying component to approach or move away from the fixed conveying component. The fixed conveying component includes a fixed conveying beam, and the moving conveying component includes a moving conveying beam. Both the fixed conveying component and the moving conveying component include a conveyor belt structure. The conveyor belt structure includes a conveying motor, a tensioning wheel, a supporting wheel, and a conveyor belt. The conveyor belt is respectively wound around the outer circumferences of the supporting wheel, the output wheel of the conveying motor, and the tensioning wheel. The two conveyor belts are respectively used to abut against both sides of the bottom surface of the PCB board.

[0008] By adopting the above technical solution, the distance between the moving conveying component and the fixed conveying component can be pre-adjusted according to the actual width of PCB boards of different models. This adjustable design enables the conveying device to adapt to PCB boards of various size specifications, ensuring that the two conveyor belts can stably contact both sides of the bottom surface of the PCB board, thereby improving the smoothness and accuracy during the transmission process, and effectively avoiding jamming or offset problems caused by the mismatch between the equipment and the size of the PCB board. The conveying motor serves as the power source to drive the conveyor belt to operate. The tensioning wheel is used to adjust the tightness of the conveyor belt to ensure that the conveyor belt maintains an appropriate tension during operation, avoiding belt slipping or excessive wear. The supporting wheel plays a role in supporting the conveyor belt, enabling it to stably abut against the PCB board. The conveyor belt is respectively wound around the outer circumferences of the supporting wheel, the output wheel of the conveying motor, and the tensioning wheel to form a closed loop. When the conveying motor is started, the output wheel drives the conveyor belt to operate. Since the conveyor belt abuts against both sides of the bottom surface of the PCB board, the PCB board will be conveyed as the conveyor belt operates.

[0009] Optionally, the fixed driving assembly includes a fixed driving beam, an adjustment motor, a driving lead screw, a driving nut engaging with the driving lead screw, a driven lead screw, a driven nut engaging with the driven lead screw, and a synchronous belt. The adjustment motor is fixedly connected to the fixed driving beam, and an output end of the adjustment motor is drivingly connected to the driving lead screw to drive the driving lead screw to rotate about its own axis. The driving nut and the driven nut are both fixedly connected to the moving conveying beam. A driving pulley is provided on the driving lead screw, and a driven pulley is provided on the driven lead screw. The synchronous belt is respectively wound around the outer circumferences of the driving pulley and the driven pulley.

[0010] By adopting the above technical solution, the adjustment motor drives the driving lead screw to rotate, driving the driving nut engaging therewith to move along the axis direction of the lead screw. At the same time, the synchronous belt transmits power to the driven lead screw, causing the driven lead screw to rotate synchronously, thereby driving the driven nut to move at the same speed and in the same direction. Since both the driving nut and the driven nut are fixedly connected to the moving conveying beam, the moving conveying beam can be smoothly moved closer to or away from the fixed conveying assembly under the drive of the driving nut and the driven nut, realizing the pressure adjustment of the PCB board and ensuring the stability and reliability of the transmission process. This transmission method not only improves the transmission accuracy but also effectively avoids jamming phenomena, enhancing the overall performance of the equipment.

[0011] Optionally, any one or both of the fixed conveying assembly and the moving conveying assembly include a positioning structure. The positioning structure includes a pushing member and a stop block. The pushing member is fixedly connected to the fixed conveying beam and / or the moving conveying beam, and the pushing member is used to drive the stop block to move closer to or away from the conveyor belt structure in the vertical direction.

[0012] By adopting the above technical solution, when it is necessary to block the PCB board, the pushing member drives the stop block to move closer to the conveyor belt structure, thereby accurately blocking the PCB board to achieve positioning. On the contrary, when it is necessary to release the PCB board for continuous conveyance, the pushing member drives the stop block to move away from the conveyor belt structure. This design enables the stop block to flexibly move closer to or away from the conveyor belt structure, effectively and accurately controlling the blocking and release of the PCB board, ensuring the stability during the conveyance process and the accuracy during the detection process.

[0013] Optionally, it further includes a lighting device. The lighting device includes an upper lighting assembly and a lower lighting assembly. The upper lighting assembly includes two oppositely arranged upper light strips. The upper light strips are fixedly connected to the frame and are perpendicular to the conveying direction of the conveyor belt structure. The lower lighting assembly includes two oppositely arranged lower light strips. One of the two lower light strips is fixedly connected to the fixed conveying beam, and the other is fixedly connected to the moving conveying beam.

[0014] By adopting the above technical solution, the upper lighting component and the lower lighting component respectively supplement the light on the upper and lower surfaces of the PCB board, thereby providing uniform and stable light source irradiation for the upper and lower surfaces of the PCB board, ensuring that clear and high-contrast images are obtained when the first camera and the second camera take pictures. This design effectively avoids the problem of blurred images caused by insufficient or uneven light, thereby improving the accuracy of QR code recognition and defect detection. At the same time, the relative arrangement of the upper light bar and the lower light bar further optimizes the light distribution and enhances the adaptability and reliability of the system.

[0015] Optionally, the position detection module includes a photoelectric sensor, which is fixedly connected to the moving conveyor beam and is used to detect whether a PCB board passes through the conveyor device.

[0016] By adopting the above technical solution, the photoelectric sensor can accurately detect whether a PCB board passes through the conveyor device. During actual use, the positioning structure is normally open, that is, the pushing member drives the stop block to stay away from the conveyor belt structure. When the photoelectric sensor detects a PCB board, it will send a signal to trigger the action of the pushing member. The pushing member then drives the stop block to move from a position away from the conveyor belt structure to a position close to the conveyor belt structure to intercept and position the PCB board. After the detection is completed, the pushing member releases the PCB board, and the stop block returns to a position away from the conveyor belt structure to wait for the next detection task.

[0017] Optionally, the image processing module is configured with an image analysis unit and a signal sending unit. The image analysis unit is used to analyze the QR code, and the signal sending unit is used to send the analysis result to an external MES system.

[0018] By adopting the above technical solution, the image processing module can accurately analyze the content of the QR code and seamlessly transfer it to the external production management system, thereby ensuring the real-time and accuracy of production data. This process effectively reduces the error rate caused by manual entry, improves the information flow efficiency of the entire production process, and lays a solid foundation for the enterprise to build an intelligent production workshop.

[0019] Optionally, it further includes an alarm indicator light, which is signal-connected to the position detection module, the image processing module and the external MES system. When there is no abnormal state, it lights up a green light; when the position detection module detects that no PCB board enters the device within 60 seconds, it switches to the standby state and lights up a yellow light; when the MES fails to verify the QR code, the alarm indicator light notifies the position detection module not to issue an instruction to continue conveying the PCB board to the conveyor device and lights up a red light.

[0020] By adopting the above technical solution, the operating state of the device can be intuitively feedback during the detection process, improving the operator's understanding of the device's working conditions. By setting up three different colors of lights for indication, namely red, yellow, and green, it can not only promptly inform the operator whether the device is in a normal working state, but also give a clear warning in the standby or abnormal situations, thus effectively reducing the downtime caused by abnormal states and enhancing the stability and reliability of the entire production process.

[0021] Optionally, both the first camera and the second camera are professional optical lens cameras with a resolution of 65 million pixels.

[0022] By adopting the above technical solution, the image clarity and detail presentation ability of PCB board detection can be significantly improved, ensuring that high-quality image data can be accurately obtained even in complex texture or micro-feature areas, thereby enhancing the reliability of subsequent QR code recognition and defect detection.

[0023] In summary, the present application includes at least one of the following beneficial technical effects: 1. Realize double-sided synchronous detection of the PCB board. The first camera and the second camera arranged up and down complete high-definition image capture of the top and bottom sides at one time, significantly improving the detection efficiency and ensuring data integrity; 2. Have high-efficient quality traceability ability. With the help of the image processing module to analyze the QR code and send the results to the external MES system, realize real-time update of production data and full-process traceability; 3. High detection accuracy and strong adaptability. By using professional optical lens cameras with a resolution of 65 million pixels, it can accurately identify subtle defects and QR code information, meeting the requirements of high-end manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of the AOI-based PCB board detection device provided by an embodiment of the present application.

[0025] Figure 2 is a schematic structural diagram of the AOI-based PCB board detection device provided by an embodiment of the present application, in which some structures of the lower box body and the upper observation window are not shown.

[0026] Figure 3 is a schematic structural diagram of the conveying device, the position detection module and the lighting device provided by an embodiment of the present application.

[0027] Figure 4 is a schematic structural diagram of the conveying device, the position detection module and the lighting device from another angle provided by an embodiment of the present application.

[0028] Description of reference numerals: 1 - Conveyor device; 101 - Frame; 102 - Fixed conveyor beam; 103 - Movable conveyor beam; 104 - Conveyor motor; 105 - Tensioning pulley; 106 - Support pulley; 107 - Conveyor belt; 108 - Fixed drive beam; 109 - Adjustment motor; 110 - Active lead screw; 11001 - Active belt pulley; 111 - Active lead nut; 112 - Driven lead screw; 11201 - Driven belt pulley; 113 - Driven lead nut; 114 - Timing belt; 115 - Pushing member; 116 - Stop block; 2 - Position detection module; 3 - First camera; 4 - Second camera; 5 - Image processing module; 6 - PCB board; 7 - Upper light bar; 8 - Lower light bar; 9 - Alarm indicator light; 10 - Upper box body; 1001 - Upper observation window; 11 - Lower box body. Detailed implementation manners

[0029] The following further elaborates on this application Figures 1-4 in conjunction with the attached drawings.

[0030] An AOI-based PCB board detection device is disclosed in an embodiment of this application.

[0031] As Figure 1 shown and Figure 2 described, the AOI-based PCB board detection device includes a conveyor device 1, a position detection module 2, a first camera 3 and a second camera 4 arranged vertically, and an image processing module 5. The first camera 3 and the second camera 4 are both professional optical lens cameras with a resolution of 65 million pixels. The conveyor device 1 is used to convey the PCB board 6. The position detection module 2 is signal-connected to the conveyor device 1 to detect the position of the PCB board 6 and control the conveyor device 1 to pause the conveyance of the PCB board 6. The first camera 3 and the second camera 4 are respectively located above and below the PCB board 6 to take pictures of both sides of the PCB board 6. The image processing module 5 is signal-connected to the first camera 3 and the second camera 4 to receive and process the captured images. The image processing module 5 is also signal-connected to the position detection module 2 to notify the position detection module 2 to issue an instruction to the conveyor device 1 to continue conveying the PCB board 6. The image processing module 5 is configured with an image analysis unit and a signal sending unit. The image analysis unit is used to analyze two-dimensional codes, and the signal sending unit is used to send the analysis result to an external MES system and determine whether to notify the position detection module 2 to issue an instruction to the conveyor device 1 to continue conveying the PCB board 6 based on the result feedback by the MES system.

[0032] This solution can ensure the precise positioning of the PCB board 6 during the detection process, thus guaranteeing the accuracy of double-sided synchronous photographing. At the same time, the image processing module 5 not only completes the basic functions of image reception and processing, but also can work in coordination with the position detection module 2 to ensure the smooth connection of the detection process, effectively avoiding operation errors caused by manual intervention. The professional optical lens camera with a resolution of 65 million pixels can significantly improve the image clarity and detail presentation ability of the PCB board 6 detection, ensuring that high-quality image data can be accurately obtained even in areas with complex textures or tiny features, thereby improving the reliability of subsequent QR code recognition and defect detection. This achieves the full-automatic detection and information processing of the PCB board 6, significantly improving the automation level and reliability of the detection process.

[0033] The image processing module 5 can accurately analyze the content of the QR code and seamlessly transfer it to the external production management system, thus ensuring the real-time and accuracy of production data. This process effectively reduces the error rate caused by manual entry, improves the information flow efficiency of the entire production process, and lays a solid foundation for the enterprise to build an intelligent production workshop.

[0034] As Figure 3 and Figure 4 shown, specifically, the conveying device 1 includes a frame 101, a fixed conveying component, a moving conveying component, and a fixed driving component. The fixed conveying component and the fixed driving component are fixedly connected to the frame 101. The fixed driving component is used to drive the moving conveying component to approach or move away from the fixed conveying component. The fixed conveying component includes a fixed conveying beam 102, and the moving conveying component includes a moving conveying beam 103. Both the fixed conveying component and the moving conveying component include a conveyor belt structure. The conveyor belt structure includes a conveying motor 104, a tensioning wheel 105, a supporting wheel 106, and a conveying belt 107. The conveying belt 107 is respectively wound around the outer circumference of the supporting wheel 106, the output wheel of the conveying motor 104, and the tensioning wheel 105. The two conveying belts 107 are respectively used to abut against both sides of the bottom surface of the PCB board 6. The first camera 3 and the second camera 4 can be fixedly connected to the frame 101.

[0035] The conveying device 1 can pre-adjust the distance between the moving conveying component and the fixed conveying component according to the actual width of the PCB board 6 of different models. This adjustable design enables the conveying device 1 to adapt to PCB boards 6 of various size specifications, ensuring that the two conveying belts 107 can stably contact both sides of the bottom surface of the PCB board 6, thereby enhancing the smoothness and accuracy of the transmission process and effectively preventing jamming or offset problems caused by the mismatch between the equipment and the size of the PCB board 6. The conveying motor 104 serves as the power source to drive the operation of the conveying belt 107. The tensioning pulley 105 is used to adjust the tightness of the conveying belt 107 to ensure that the conveying belt 107 maintains an appropriate tension during operation, avoiding belt slipping or excessive wear. The supporting pulley 106 plays a role in supporting the conveying belt 107, enabling it to stably contact the PCB board 6. The conveying belt 107 is respectively wound around the outer circumferences of the supporting pulley 106, the output pulley of the conveying motor 104, and the tensioning pulley 105 to form a closed loop. When the conveying motor 104 is started, the output pulley drives the conveying belt 107 to operate. Since the conveying belt 107 contacts both sides of the bottom surface of the PCB board 6, the PCB board 6 will be conveyed as the conveying belt 107 operates.

[0036] As Figure 3 and Figure 4 shown, among which, the fixed driving component includes a fixed driving beam 108, an adjustment motor 109, a driving lead screw 110, a driving nut 111 that cooperates with the driving lead screw 110, a driven lead screw 112, a driven nut 113 that cooperates with the driven lead screw 112, and a synchronous belt 114. The adjustment motor 109 is fixedly connected to the fixed driving beam 108, and the output end of the adjustment motor 109 is drivingly connected to the driving lead screw 110 to drive the driving lead screw 110 to rotate around its own axis. Both the driving nut 111 and the driven nut 113 are fixedly connected to the moving conveying beam 103. A driving pulley 11001 is provided on the driving lead screw 110, and a driven pulley 11201 is provided on the driven lead screw 112. The synchronous belt 114 is respectively wound around the outer circumferences of the driving pulley 11001 and the driven pulley 11201.

[0037] During the working process, by driving the rotation of the driving lead screw 110 through the adjustment motor 109, the driving nut 111 that cooperates with it is moved along the axis direction of the lead screw. At the same time, the synchronous belt 114 transmits the power to the driven lead screw 112 to ensure the synchronous rotation of the driven lead screw 112, so that the driven nut 113 moves at the same speed and in the same direction. Given that both the driving nut 111 and the driven nut 113 are fixedly connected to the moving conveying beam 103, the moving conveying beam 103 can smoothly approach or move away from the fixed conveying component under the coordinated action of the driving nut 111 and the driven nut 113, thereby realizing the pressure adjustment of the PCB board 6 and ensuring the stability and reliability of the transmission process. Such a transmission mechanism not only improves the transmission accuracy but also effectively prevents jamming phenomena, thus enhancing the overall performance of the equipment.

[0038] As shown Figure 3 and Figure 4 in the figure, the moving transfer assembly further includes a positioning structure, which includes a pushing member 115 and a stop block 116. The pushing member 115 is fixedly connected to the moving transfer beam 103 respectively, and the pushing member 115 is used to drive the stop block 116 to approach or move away from the conveyor belt structure in the vertical direction.

[0039] When it is necessary to block the PCB board 6, the pushing member 115 will drive the stop block 116 to approach the conveyor belt structure, so as to accurately block the PCB board 6 and achieve positioning. On the contrary, when it is necessary to release the PCB board 6 to continue the transfer, the pushing member 115 drives the stop block 116 to move away from the conveyor belt structure. This design enables the stop block 116 to approach or move away from the conveyor belt structure flexibly, effectively and accurately controls the blocking and release of the PCB board 6, and ensures the stability during the transfer process and the accuracy during the detection process.

[0040] As shown Figure 3 and Figure 4 in the figure, in order to provide illumination for the front and back surfaces of the PCB board 6, the AOI-based PCB board detection device further includes an illumination device, which includes an upper illumination component and a lower illumination component. The upper illumination component includes two relatively arranged upper light bars 7, and the upper light bars 7 are fixedly connected to the frame 101 and perpendicular to the transfer direction of the conveyor belt structure. The lower illumination component includes two relatively arranged lower light bars 8, and one of the two lower light bars 8 is fixedly connected to the fixed transfer beam 102, and the other is fixedly connected to the moving transfer beam 103.

[0041] The upper illumination component and the lower illumination component respectively supplement the light of the upper surface and the lower surface of the PCB board 6, and then provide uniform and stable light source illumination for the upper and lower surfaces of the PCB board 6, ensuring that the first camera 3 and the second camera 4 can obtain clear and high-contrast images during the shooting process. This design effectively avoids the problem of blurred images caused by insufficient or uneven light distribution, thereby improving the accuracy of QR code recognition and defect detection. At the same time, the relative configuration of the upper light bar 7 and the lower light bar 8 further optimizes the light distribution and improves the adaptability and reliability of the system.

[0042] As shown Figure 3 in the figure, the position detection module 2 includes a photoelectric sensor, which is fixedly connected to the fixed transfer beam 102 and is used to detect whether a PCB board 6 passes through the transfer device 1.

[0043] During actual use, the positioning structure is normally open, that is, the pushing member 115 drives the stop block 116 to remain at a position away from the conveyor belt structure. When the photoelectric sensor detects the PCB board 6, it will send a signal to trigger the action of the pushing member 115. The pushing member 115 then drives the stop block 116 to move from a position away from the conveyor belt structure to a position close to the conveyor belt structure, realizing the interception and positioning of the PCB board 6. After the detection is completed, the pushing member 115 releases the PCB board 6, and the stop block 116 returns to a position away from the conveyor belt structure, waiting for the next detection task.

[0044] As Figure 1 and Figure 2 shown, in order to protect the first camera 3 and the second camera 4, the AOI-based PCB board detection device further includes an upper box body 10 and a lower box body 11. Both the upper box body 10 and the lower box body 11 are fixedly connected to the frame 101. The bottom of the upper box body 10 is provided with an upper observation window 1001 for the first camera 3 to take pictures, and the bottom of the lower box body 11 is provided with a lower observation window for the second camera 4 to take pictures. One side of the upper box body 10 may also be provided with an openable or closable detection window for operators to perform inspections.

[0045] As Figure 1 and Figure 2 shown, the AOI-based PCB board detection device further includes an alarm indicator light 9. The alarm indicator light 9 is signal-connected to the position detection module 2, the image processing module 5, and the external MES system. When there is no abnormal state, it lights up a green light; when the position detection module 2 detects that no PCB board 6 enters the device within 60 seconds, it switches to the standby state and lights up a yellow light; when the MES fails to verify the QR code, the alarm indicator light 9 notifies the position detection module 2 not to issue an instruction to the conveying device 1 to continue conveying the PCB board 6 and lights up a red light.

[0046] The alarm indicator light 9 can intuitively feedback the operating state of the device during the detection process, improving the operator's understanding of the device's working conditions. By setting three different colors of lights, namely red, yellow, and green, it can not only timely inform the operator whether the device is in a normal working state, but also give a clear warning in the standby or abnormal situation, thus effectively reducing the downtime caused by abnormal states and enhancing the stability and reliability of the entire production process.

[0047] The implementation principle of an AOI-based PCB board detection device according to an embodiment of the present application is as follows: After the device is started, the position detection module 2 first initializes to ensure that the sensor is in a normal working state. Subsequently, the upstream device starts to convey the PCB board 6 to the AOI-based PCB board detection device.

[0048] The position detection module 2 confirms the passing of the PCB board 6, and the pusher 115 drives the stopper 116 to approach the conveyor belt structure, so as to accurately block the PCB board 6 and achieve positioning. The image processing module 5 starts to capture and process the image of the PCB board 6 conveyed by the conveying device 1. Through a high-precision image recognition algorithm, the image processing module 5 can accurately identify the QR code information on the PCB board 6 and compare and verify it with the data in the MES system.

[0049] During the detection process, if the QR code verification of the PCB board 6 is successful, the alarm indicator light 9 shows a green light, indicating that everything is normal. At this time, the conveying device 1 continues to convey the PCB board 6 to the next process. If the position detection module 2 does not detect the entry of the PCB board 6 into the device within the set 60 seconds, the system will automatically switch to the standby state and display a yellow light through the alarm indicator light 9 to remind the operator to check whether there is a fault in the upstream device or the conveying device 1.

[0050] When the MES system fails to verify the QR code, the alarm indicator light 9 immediately shows a red light. At the same time, the position detection module 2 responds quickly and does not issue an instruction to the conveying device 1 to continue conveying the PCB board 6, preventing the entry of incorrect or unqualified PCB boards 6 into the subsequent processes. At this time, the operator needs to intervene and handle it in a timely manner according to the alarm indication to ensure the accuracy and stability of the production process.

[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A PCB board inspection device based on AOI, characterized in that: include: A conveying device (1), a position detection module (2), a first camera (3) and a second camera (4) arranged above and below, and an image processing module (5); the conveying device (1) is used to convey a PCB board (6); the position detection module (2) is connected to the conveying device (1) by signal to detect the position of the PCB board (6) and control the conveying device (1) to suspend conveying the PCB board (6); the first camera (3) and the second camera (4) are respectively located above and below the PCB board (6) to take pictures of both sides of the PCB board (6); the image processing module (5) is connected to the first camera (3) and the second camera (4) by signal to receive and process the taken images; the image processing module (5) is also connected to the position detection module (2) by signal to notify the position detection module (2) to issue an instruction to the conveying device (1) to continue conveying the PCB board (6).

2. The AOI-based PCB board inspection device according to claim 1, characterized in that: The conveying device (1) comprises a frame (101), a fixed conveying component, a dynamic conveying component and a fixed driving component. The fixed conveying component and the fixed driving component are fixedly connected to the frame (101). The fixed driving component is used to drive the dynamic conveying component to approach or move away from the fixed conveying component. The fixed conveying component comprises a fixed conveying beam (102). The dynamic conveying component comprises a dynamic conveying beam (103). Both the fixed conveying component and the dynamic conveying component comprise a transfer belt structure. The transfer belt structure comprises a conveying motor (104), a tensioning wheel (105), a support wheel (106) and a conveying belt (107). The conveying belt (107) is respectively wound around the support wheel (106), the output wheel of the conveying motor (104) and the outer circumference of the tensioning wheel (105). The two conveying belts (107) are respectively used to abut against two sides of the bottom surface of the PCB board (6).

3. The AOI-based PCB board inspection device according to claim 2, characterized in that: The fixed drive assembly comprises a fixed drive beam (108), an adjustment motor (109), an active lead screw (110), an active nut (111) matched with the active lead screw (110), a driven lead screw (112), a driven nut (113) matched with the driven lead screw (112), and a synchronous belt (114); the adjustment motor (109) is fixedly connected to the fixed drive beam (108); an output end of the adjustment motor (109) is connected to the active lead screw (110); The driving connection is used to drive the active lead screw (110) to rotate around its own axis. The active nut (111) and the driven nut (113) are both fixedly connected to the dynamic transmission beam (103). The active lead screw (110) is provided with a driving pulley (11001), and the driven lead screw (112) is provided with a driven pulley (11201). The synchronous belt (114) is respectively wound around the outer circumference of the active pulley (11001) and the driven pulley (11201).

4. The AOI-based PCB board inspection device according to claim 2, characterized in that: Either or both of the fixed conveying assembly and the movable conveying assembly include a positioning structure, wherein the positioning structure includes a pushing member (115) and a stop block (116), wherein the pushing member (115) is fixedly connected to the fixed conveying beam (102) and / or the movable conveying beam (103), and the pushing member (115) is used to drive the stop block (116) in a vertical direction to move closer to or away from the conveyor belt structure.

5. The AOI-based PCB board inspection device according to claim 2, characterized in that: It also includes a lighting device, which includes an upper lighting assembly and a lower lighting assembly, the upper lighting assembly includes two upper light bars (7) arranged opposite to each other, the upper light bars (7) are fixedly connected to the frame (101) and are perpendicular to the conveying direction of the conveyor belt structure, and the lower lighting assembly includes two lower light bars (8) arranged opposite to each other, one of the two lower light bars (8) is fixedly connected to the fixed conveying beam (102), and the other is fixedly connected to the movable conveying beam (103).

6. The AOI-based PCB board inspection device according to claim 2, characterized in that: The position detection module (2) comprises a photoelectric sensor, which is fixedly connected to the movable conveying beam (103) and is used to detect whether a PCB board (6) passes by the conveying device (1).

7. The AOI-based PCB board inspection device according to claim 2, characterized in that: The image processing module (5) is equipped with an image parsing unit and a signaling unit, wherein the image parsing unit is used to parse the QR code, and the signaling unit is used to send the parsing result to an external MES system.

8. The AOI-based PCB board inspection device according to claim 7, characterized in that: It also includes an alarm indicator light (9), which is connected to the position detection module (2), the image processing module (5) and the external MES system signal, and lights up a green light when no abnormal state occurs; when the position detection module (2) detects that no PCB board (6) enters the device within 60 seconds, it switches to a standby state and lights up a yellow light; when the MES fails to verify the QR code, the alarm indicator light (9) notifies the position detection module (2) not to issue an instruction to the conveying device (1) to continue conveying the PCB board (6) and lights up a red light.

9. The AOI-based PCB board inspection device according to claim 1, characterized in that: The first camera (3) and the second camera (4) are both professional optical lens cameras with a resolution of 65 million pixels.

Images