A metal bipolar plate defect detection and flow channel measurement apparatus and method

Abstract

The present application belongs to the technical field of machine vision detection and precision measurement, and particularly relates to a kind of metal bipolar plate defect detection and flow channel measuring equipment, including rack, conveying mechanism, upper surface defect detection unit, lower surface defect detection unit, flow channel height measuring unit, sorting unit and host computer control system.Upper surface defect detection unit shoots the upper surface of bipolar plate in motion;Lower surface defect detection unit realizes lower surface shooting;Flow channel height measuring unit obtains three-dimensional point cloud using laser profile sensor.Host computer realizes automatic precision measurement of flow channel height.Host computer converts detection results into qualified / defective judgment signal, and controls sorting unit to perform sorting action.The present application realizes full-automatic high-precision detection, sorting and automatic measurement of flow channel height of metal bipolar plate front and back surface, improves detection efficiency, has high comprehensive detection rate, significantly reduces labor intensity and missed detection rate, and is suitable for large-scale fuel cell production line.

Description

Technical Field

[0001] This invention belongs to the field of machine vision and precision measurement technology, specifically relating to a device and method for detecting defects in metal bipolar plates and measuring flow channels. Background Technology

[0002] Metal bipolar plates are the core components of hydrogen fuel cell stacks, and their surface quality and flow channel height directly affect battery performance and lifespan. Currently, the detection of appearance defects (scratches, cracks, dents, indentations, etc.) and flow channel height of metal bipolar plates mainly relies on manual visual inspection combined with a coordinate measuring machine (CMM), which has the following problems: ① low detection efficiency and high labor intensity; ② eye fatigue leading to missed or false detections; ③ contact measurement is prone to secondary damage and time-consuming; ④ measurement results are affected by human factors, resulting in poor data consistency and failing to meet the needs of large-scale automated production. Therefore, there is an urgent need for a high-speed, high-precision, fully automated device and method for detecting appearance defects and flow channel height of metal bipolar plates. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a metal bipolar plate defect detection and flow channel measurement device and method, which realizes automated detection of defects on both sides and high-precision automated measurement of flow channel height.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a metal bipolar plate defect detection and flow channel measurement device, comprising a frame (1), an upper surface defect detection unit (2), a conveying mechanism (3), a lower surface defect detection unit (4), a flow channel height measurement unit (5), a sorting unit (6), and a host computer control system (8); the conveying mechanism (3) is used to carry and transport the metal bipolar plate (7); the upper surface defect detection unit (2) is disposed above the conveying mechanism (3) and is used to acquire images of the upper surface of the moving metal bipolar plate (7); The lower surface defect detection unit (4) is located at the corresponding workstation of the conveying mechanism (3), including a lower industrial camera (42), a lower light source assembly (41), a lifting / transporting mechanism (44), and a suction cup mechanism (45). The lifting / transporting mechanism (44) is installed above the conveyor belt of the conveying mechanism (3) and is used to drive the suction cup mechanism (45) to adsorb the metal bipolar plate (7) and lift and suspend it, so that the lower surface of the metal bipolar plate faces downward and directly faces the lower industrial camera (42) to realize the image acquisition of the lower surface. The sorting unit (6) is located downstream of the lower surface defect detection unit (4) and is connected to the upper computer control system (8) for communication. It judges the upper and lower surface defects based on the upper surface and lower surface defect detection output by the upper computer control system (8). As a result, the metal bipolar plates (7) are sorted, and the metal bipolar plates (7) with good appearance are sent to the flow channel height measurement unit (5), while the metal bipolar plates (7) with poor appearance are sent to the defective product receiving box (64). The flow channel height measurement unit (5) is equipped with a laser profilometer (54). The laser profilometer (54) is used to perform point cloud scanning on the metal bipolar plates that have passed the sorting, so as to achieve accurate measurement of the flow channel height. The host computer control system (8) establishes communication connections with the upper surface defect detection unit (2), the lower surface defect detection unit (4), the flow channel height measurement unit (5) and the sorting unit (6) respectively, and is used to coordinate and control image acquisition, defect detection, flow channel height measurement and the action coordination of each unit.

[0005] Furthermore, the aforementioned upper surface defect detection unit (2) includes a detection mounting bracket (21), an industrial camera (22), a light source (23), a horizontal mounting beam (24), a vertical support rod (25), and a detection mounting frame (26). The detection mounting frame (26) is used to mount the industrial camera (22) and the light source (23). The horizontal mounting beam (24) is connected to the vertical support rod (25). The detection mounting bracket (21) is located between the horizontal mounting beam (24) and the detection mounting frame (26) to fix the detection mounting frame (26) above the conveying mechanism (3). The light source (23) is configured in conjunction with the industrial camera (22) to suppress specular reflection on the surface of the metal bipolar plate and improve the contrast of defect imaging.

[0006] Furthermore, the aforementioned lower surface defect detection unit (4) also includes a detection mounting bracket (43) and a detection mounting frame (46); the suction cup mechanism (45) is positioned above the metal bipolar plate (7) and adsorbs its non-detection area; the lifting / transporting mechanism (44) is mounted on the detection mounting bracket (43) and the detection mounting frame (46). During the detection process, the lifting / transporting mechanism (44) drives the suction cup mechanism (45) and the adsorbed metal bipolar plate (7) to lift and hover, without needing to flip the metal bipolar plate (7), so that the lower-mounted industrial camera (42) can capture images of the lower surface of the metal bipolar plate.

[0007] Furthermore, the above-mentioned flow channel height measurement unit (5) includes a measurement platform lateral movement module (51), a laser profilometer movement module (52), a measurement mounting frame (53), a laser profilometer (54), and a measurement platform (55); the measurement mounting frame (53) is used to install and support the measurement platform lateral movement module (51) and the laser profilometer movement module (52); the measurement platform (55) is used to carry the metal bipolar plate (7), and the laser profilometer (54) is installed on the laser profilometer movement module (52) to realize the scanning measurement of the flow channel area of ​​the metal bipolar plate (7) on the measurement platform (55).

[0008] Furthermore, the above-mentioned measurement platform lateral movement module (51) is used to drive the measurement platform (55) to move along the first direction, and the laser profilometer movement module (52) is used to drive the laser profilometer (54) to move along the second direction; the first direction and the second direction are intersected so that the laser profilometer (54) can scan the flow channel area of ​​the metal bipolar plate (7).

[0009] Furthermore, the sorting unit (6) includes a lateral movement module (61), a lifting module (62), a suction cup mechanism (63), and a defective product receiving box (64); the lateral movement module (61) is used to drive the lifting module (62) to move laterally, the lifting module (62) is used to drive the suction cup mechanism (63) to lift and lower, so as to realize the gripping and transfer of the metal bipolar plate (7), and the suction cup mechanism (63) transfers the metal bipolar plate (7) to the defective product receiving box (64) or the flow channel height measuring unit (5) according to the instructions of the host computer control system (8).

[0010] Furthermore, the host computer control system (8) performs point cloud processing and contour analysis on the data acquired by the flow channel height measurement unit (5), including filtering, alignment, section extraction, contour reconstruction, contour segmentation and flow channel height calculation, with a measurement error ≤ 5.245 μm.

[0011] This invention also proposes a method for defect detection and flow channel measurement of metal bipolar plates, comprising the following steps: S1, Loading: Place the metal bipolar plate (7) on the conveying mechanism (3); S2, conveying, the conveying mechanism (3) starts, driving the metal bipolar plate (7) to pass through the detection stations of the upper surface defect detection unit (2) and the lower surface defect detection unit (4) in sequence along the conveying direction; S3, upper surface defect detection, when the metal bipolar plate (7) passes through the upper surface defect detection unit (2) detection station, the upper surface defect detection unit (2) turns on the light source (23), the industrial camera (22) collects the upper surface image of the metal bipolar plate (7) and transmits the collected image data to the host computer control system (8). S4, Lower surface defect detection: When the metal bipolar plate (7) passes through the detection station of the lower surface defect detection unit (4), the conveying mechanism (3) pauses, and the lifting / transporting mechanism (44) in the lower surface defect detection unit (4) drives the suction cup mechanism (45) to descend and adsorb the non-detection area of ​​the metal bipolar plate (7). Then, it drives the metal bipolar plate (7) to rise and hover, so that the lower surface faces down and is directly facing the lower industrial camera (42). The lower light source assembly (41) is turned on, and the lower industrial camera (42) performs image acquisition on the lower surface. The acquired image data is transmitted to the upper computer control system (8) to complete the lower surface defect judgment. After the judgment is completed, the lifting / transporting mechanism (44) drives the metal bipolar plate (7) to descend and return it to the conveying mechanism (3). S5, Defect judgment, the host computer control system (8) integrates the defect detection results of the upper and lower surfaces to form the judgment of good and bad products, and sends the judgment result to the sorting unit (6). S6, Sorting, the sorting unit (6) sends the defective products to the defective product receiving box according to the received judgment result, and sends the good products to the flow channel height measuring unit (5). S7, flow channel height measurement, the flow channel height measurement unit (5) performs point cloud scanning on the good-looking product, and the scanned data is transmitted to the host computer control system (8), and the host computer control system (8) performs flow channel height measurement to complete the detection.

[0012] Compared with the prior art, the present invention has at least the following beneficial effects: 1. It can perform online automatic inspection of the upper and lower surfaces of metal bipolar plates, significantly reducing the intensity of manual inspection and improving inspection efficiency.

[0013] 2. By automatically separating defective products from good products after defect determination, invalid measurements can be reduced and the utilization efficiency of the flow channel height measurement unit can be improved.

[0014] 3. The device has a compact structure and clear detection, sorting and measurement logic, making it easy to integrate with existing automated production lines.

[0015] 4. This invention achieves fully automated high-precision detection of appearance defects on both sides of metal bipolar plates and automated precision measurement of flow channel height. Compared with traditional manual inspection, the detection efficiency is increased by more than 10 times, the overall detection rate reaches more than 92.5%, and the measurement error is controlled within 5.245μm. It significantly reduces the rate of missed detection and false detection and labor costs, and is suitable for large-scale automated production lines for hydrogen fuel cells. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall assembly structure of the device of the present invention.

[0017] Figure 2 This is a schematic diagram of the surface defect detection unit of the present invention.

[0018] Figure 3 This is a schematic diagram of the structure of the lower surface defect detection unit of the present invention.

[0019] Figure 4 This is a schematic diagram of the flow channel height measuring unit of the present invention.

[0020] Figure 5 This is a schematic diagram of the sorting unit of the present invention.

[0021] Figure 6 This is a process flow diagram of the bipolar plate detection and sorting system of the present invention.

[0022] The components include: 1. Frame; 2. Upper surface defect detection unit; 3. Conveying mechanism; 4. Lower surface defect detection unit; 5. Flow channel height measurement unit; 6. Sorting unit; 7. Metal bipolar plate; 8. Host computer control system. 21 Mounting bracket; 22 Industrial camera; 23 Light source; 24 Horizontal mounting beam; 25 Vertical support rod; 26 Inspection mounting frame; 41 Light source; 42 Bottom-mounted industrial camera; 43 Inspection mounting bracket; 44 Lifting / transfer mechanism; 45 Suction cup mechanism; 46 Inspection mounting frame; 51 Lateral movement module of the measurement platform; 52 Moving module of the laser profilometer; 53 Measurement mounting frame; 54 Laser profilometer; 55 Measurement platform; 61 Lateral movement module; 62 Lifting module; 63 Suction cup mechanism; 64 Defective product receiving box. Detailed Implementation

[0023] like Figure 1As shown, the present invention provides a metal bipolar plate defect detection and flow channel measurement device, including a frame (1), an upper surface defect detection unit (2), a conveying mechanism (3), a lower surface defect detection unit (4), a flow channel height measurement unit (5), a sorting unit (6), and a host computer control system (8). After being loaded, the metal bipolar plates (7) are placed on the conveying mechanism (3) and pass through the upper surface defect detection station, the lower surface defect detection station, and the sorting station in sequence along a set direction; products with appearance defects directly enter the defective product receiving box, while products with good appearance enter the flow channel height measurement unit (5).

[0024] As a preferred embodiment of the present invention, such as Figure 2 As shown, the upper surface defect detection unit (2) includes a mounting bracket (21), an industrial camera (22), a light source (23), a horizontal mounting beam (24), a vertical support rod (25), and a detection mounting frame (26). The mounting bracket (21) is used to fix the industrial camera (22) and the light source (23), and the horizontal mounting beam (24) and the vertical support rod (25) are used to securely mount the detection mounting frame (26) above the conveying mechanism (3). The industrial camera (22) is located above the metal bipolar plate (7) and takes pictures of the upper surface of the metal bipolar plate (7) during the conveying process. The light source (23) is used to provide uniform illumination to suppress specular reflection on the metal surface and highlight surface defect features.

[0025] As a preferred embodiment of the present invention, such as Figure 3 As shown, the lower surface defect detection unit (4) includes a light source (41), a lower-mounted industrial camera (42), a detection mounting bracket (43), a lifting / transfer mechanism (44), a suction cup mechanism (45), and a detection mounting frame (46). The lower-mounted industrial camera (42) is positioned below the corresponding station of the conveying mechanism (3). The light source (41) works in conjunction with the lower-mounted industrial camera (42) to acquire images of the lower surface of the metal bipolar plate (7). The lifting / transfer mechanism (44) drives the suction cup mechanism (45) to move. When the metal bipolar plate (7) reaches the predetermined station, the suction cup mechanism (45) lifts it up and suspends it at the predetermined position so that the lower-mounted industrial camera (42) can complete the acquisition of the lower surface image under unobstructed conditions. The detection mounting bracket (43) and the detection mounting frame (46) are used to install and support the corresponding components.

[0026] As a preferred embodiment of the present invention, such as Figure 4As shown, the flow channel height measurement unit (5) includes a measurement platform lateral movement module (51), a laser profilometer movement module (52), a measurement mounting frame (53), a laser profilometer (54), and a measurement platform (55). The measurement platform (55) is used to carry the metal bipolar plate (7), and the measurement mounting frame (53) is used to support the measurement platform lateral movement module (51) and the laser profilometer movement module (52). The laser profilometer (54) is mounted on the laser profilometer movement module (52) and can scan the flow channel height of the metal bipolar plate (7) placed on the measurement platform (55) along a predetermined path; at least one of the measurement platform lateral movement module (51) and the laser profilometer movement module (52) generates relative motion to obtain high-precision profile data of the flow channel region.

[0027] As a preferred embodiment of the present invention, such as Figure 5 As shown, the sorting unit (6) includes a lateral movement module (61), a lifting module (62), a suction cup mechanism (63), and a defective product receiving box (64). The lateral movement module (61) is used to drive the lifting module (62) to move horizontally, and the lifting module (62) is used to drive the suction cup mechanism (63) to lift and lower, so as to grab the metal bipolar plate (7) located on the conveying mechanism (3). For the metal bipolar plate (7) that is determined to be defective by the host computer control system (8), the suction cup mechanism (63) transfers it to the defective product receiving box (64); for the metal bipolar plate (7) that is determined to be good in appearance, the sorting unit (6) transfers it to the flow channel height measuring unit (5).

[0028] In a preferred embodiment of the present invention, the host computer control system (8) is used to receive images acquired by the industrial camera (22) and the lower industrial camera (42) and to perform appearance defect detection on the metal bipolar plate (7). The defect types may include one or more of scratches, cracks, bumps and indentations. The host computer control system (8) is also used to receive data acquired by the laser profilometer (54) and to complete the flow channel height measurement of the metal bipolar plate (7) through algorithms such as filtering, point cloud alignment, section extraction, contour reconstruction and height calculation.

[0029] As a preferred embodiment of the present invention, the host computer control system (8) performs point cloud processing and contour analysis on the data acquired by the flow channel height measurement unit (5), including filtering, alignment, section extraction, contour reconstruction, contour segmentation and flow channel height calculation, with a measurement error ≤ 5.245 μm.

[0030] In a preferred embodiment of the present invention, the host computer control system (8) uses a deep learning-based target detection model to process the images acquired by the industrial camera (22) and the lower industrial camera (42) to identify scratches, cracks, bumps, and indentations on the upper and lower surfaces of the metal bipolar plate (7). The target detection model can be an improved HPRT-DETR model or other deep learning detection models capable of achieving the above-mentioned defect identification function.

[0031] In a preferred embodiment of the present invention, after the flow channel height measurement unit (5) acquires the point cloud data collected by the laser profilometer (54), the host computer control system (8) sequentially performs point cloud filtering, coordinate alignment, section extraction, contour reconstruction, and flow channel height calculation to obtain the flow channel height measurement result of the metal bipolar plate (7). The point cloud processing process can be implemented by means of radius filtering, affine transformation, wavelet transform reconstruction, contour segmentation, and sliding window calculation.

[0032] This invention also proposes a method for defect detection and flow channel measurement in metal bipolar plates, such as... Figure 6 As shown: First, the material is loaded and the metal bipolar plate (7) is placed on the conveying mechanism (3); then, the metal bipolar plate (7) passes through the upper surface defect detection unit (2) and the lower surface defect detection unit (4) in sequence along the conveying direction, and completes the image acquisition and defect identification of the upper and lower surfaces respectively; the host computer control system (8) makes a comprehensive judgment on the two detection results and forms the judgment results of good appearance and bad appearance; then, the sorting unit (6) performs sorting according to the judgment results, and sends the bad appearance to the bad product receiving box (64), and sends the good appearance to the flow channel height measurement unit (5); finally, the flow channel height measurement unit (5) measures the flow channel height of the good appearance.

[0033] As a specific embodiment of the present invention, the conveying mechanism (3) can be a belt conveying mechanism, and the width of the belt surface is matched with the external dimensions of the metal bipolar plate (7); the upper surface defect detection unit (2) and the lower surface defect detection unit (4) can be respectively configured with light sources suitable for the metal reflective surface; the sorting unit (6) and the flow channel height measurement unit (5) can be set in the same working area to shorten the workpiece transfer path and improve the overall detection cycle.

[0034] It should be noted that the above embodiments are merely preferred embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention, such as adaptive adjustments to the number of detection units, the form of the light source, the type of actuator, and the control strategy. These equivalent transformations should all fall within the protection scope of the present invention.

Claims

1. A device for detecting defects in metal bipolar plates and measuring flow channels, characterized in that, It includes a frame (1), an upper surface defect detection unit (2), a conveying mechanism (3), a lower surface defect detection unit (4), a flow channel height measurement unit (5), a sorting unit (6), and a host computer control system (8); the conveying mechanism (3) is used to carry and transport the metal bipolar plate (7); the upper surface defect detection unit (2) is located above the conveying mechanism (3) and is used to collect images of the upper surface of the moving metal bipolar plate (7); The lower surface defect detection unit (4) is located at the corresponding workstation of the conveying mechanism (3), including a lower industrial camera (42), a lower light source assembly (41), a lifting / transporting mechanism (44), and a suction cup mechanism (45). The lifting / transporting mechanism (44) is installed above the conveyor belt of the conveying mechanism (3) and is used to drive the suction cup mechanism (45) to adsorb the metal bipolar plate (7) and lift and suspend it, so that the lower surface of the metal bipolar plate faces downward and directly faces the lower industrial camera (42) to realize the image acquisition of the lower surface. The sorting unit (6) is located downstream of the lower surface defect detection unit (4) and is connected to the upper computer control system (8) for communication. It judges the upper and lower surface defects based on the upper surface and lower surface defect detection output by the upper computer control system (8). As a result, the metal bipolar plates (7) are sorted, and the metal bipolar plates (7) with good appearance are sent to the flow channel height measurement unit (5), while the metal bipolar plates (7) with poor appearance are sent to the defective product receiving box (64). The flow channel height measurement unit (5) is equipped with a laser profilometer (54). The laser profilometer (54) is used to perform point cloud scanning on the metal bipolar plates that have passed the sorting, so as to achieve accurate measurement of the flow channel height. The host computer control system (8) establishes communication connections with the upper surface defect detection unit (2), the lower surface defect detection unit (4), the flow channel height measurement unit (5) and the sorting unit (6) respectively, and is used to coordinate and control image acquisition, defect detection, flow channel height measurement and the action coordination of each unit.

2. The metal bipolar plate defect detection and flow channel measurement device according to claim 1, characterized in that, The upper surface defect detection unit (2) includes a detection mounting bracket (21), an industrial camera (22), a light source (23), a horizontal mounting beam (24), a vertical support rod (25), and a detection mounting frame (26). The detection mounting frame (26) is used to mount the industrial camera (22) and the light source (23). The horizontal mounting beam (24) is connected to the vertical support rod (25). The detection mounting bracket (21) is located between the horizontal mounting beam (24) and the detection mounting frame (26) to fix the detection mounting frame (26) above the conveying mechanism (3). The light source (23) is set in conjunction with the industrial camera (22) to suppress specular reflection on the surface of the metal bipolar plate and improve the contrast of defect imaging.

3. The metal bipolar plate defect detection and flow channel measurement device according to claim 1, characterized in that, The lower surface defect detection unit (4) also includes a detection mounting bracket (43) and a detection mounting frame (46); the suction cup mechanism (45) is set above the metal bipolar plate (7) and adsorbs its non-detection area; the lifting / transporting mechanism (44) is installed on the detection mounting bracket (43) and the detection mounting frame (46). During the detection process, the lifting / transporting mechanism (44) drives the suction cup mechanism (45) and the adsorbed metal bipolar plate (7) to lift and hover. Without flipping the metal bipolar plate (7), the lower-mounted industrial camera (42) can be used to take pictures of the lower surface of the metal bipolar plate.

4. The metal bipolar plate defect detection and flow channel measurement device according to claim 1, characterized in that, The flow channel height measurement unit (5) includes a measurement platform lateral movement module (51), a laser profilometer movement module (52), a measurement mounting frame (53), a laser profilometer (54), and a measurement platform (55). The measurement mounting frame (53) is used to install and support the measurement platform lateral movement module (51) and the laser profilometer movement module (52). The measurement platform (55) is used to carry the metal bipolar plate (7). The laser profilometer (54) is installed on the laser profilometer movement module (52) to realize the scanning measurement of the flow channel area of ​​the metal bipolar plate (7) on the measurement platform (55).

5. The metal bipolar plate defect detection and flow channel measurement device according to claim 4, characterized in that, The transverse movement module (51) of the measurement platform is used to drive the measurement platform (55) to move along the first direction, and the laser profilometer movement module (52) is used to drive the laser profilometer (54) to move along the second direction; the first direction and the second direction are intersected so that the laser profilometer (54) can scan the flow channel area of ​​the metal bipolar plate (7).

6. The metal bipolar plate defect detection and flow channel measurement device according to claim 1, characterized in that, The sorting unit (6) includes a lateral movement module (61), a lifting module (62), a suction cup mechanism (63), and a defective product receiving box (64). The lateral movement module (61) is used to drive the lifting module (62) to move laterally. The lifting module (62) is used to drive the suction cup mechanism (63) to lift and lower, so as to grasp and transfer the metal bipolar plate (7). The suction cup mechanism (63) transfers the metal bipolar plate (7) to the defective product receiving box (64) or the flow channel height measuring unit (5) according to the instructions of the host computer control system (8).

7. The metal bipolar plate defect detection and flow channel measurement device according to claim 1, characterized in that, The host computer control system (8) performs point cloud processing and contour analysis on the data acquired by the flow channel height measurement unit (5), including filtering, alignment, section extraction, contour reconstruction, contour segmentation and flow channel height calculation, with a measurement error ≤ 5.245 μm.

8. A method for defect detection and flow channel measurement of a metal bipolar plate, characterized in that, The device according to any one of claims 1-7 is used to implement the following steps: S1, Loading: Place the metal bipolar plate (7) on the conveying mechanism (3); S2, conveying, the conveying mechanism (3) starts, driving the metal bipolar plate (7) to pass through the detection stations of the upper surface defect detection unit (2) and the lower surface defect detection unit (4) in sequence along the conveying direction; S3, upper surface defect detection, when the metal bipolar plate (7) passes through the upper surface defect detection unit (2) detection station, the upper surface defect detection unit (2) turns on the light source (23), the industrial camera (22) collects the upper surface image of the metal bipolar plate (7) and transmits the collected image data to the host computer control system (8). S4, Lower surface defect detection: When the metal bipolar plate (7) passes through the detection station of the lower surface defect detection unit (4), the conveying mechanism (3) pauses, and the lifting / transporting mechanism (44) in the lower surface defect detection unit (4) drives the suction cup mechanism (45) to descend and adsorb the non-detection area of ​​the metal bipolar plate (7). Then, it drives the metal bipolar plate (7) to rise and hover, so that the lower surface faces down and is directly facing the lower industrial camera (42). The lower light source assembly (41) is turned on, and the lower industrial camera (42) performs image acquisition on the lower surface. The acquired image data is transmitted to the upper computer control system (8) to complete the lower surface defect judgment. After the judgment is completed, the lifting / transporting mechanism (44) drives the metal bipolar plate (7) to descend and be placed back on the conveying mechanism (3); S5, Defect judgment, the host computer control system (8) integrates the defect detection results of the upper and lower surfaces to form the judgment of good and bad products, and sends the judgment result to the sorting unit (6). S6, Sorting, the sorting unit (6) sends the defective products to the defective product receiving box according to the received judgment result, and sends the good products to the flow channel height measuring unit (5). S7, flow channel height measurement, the flow channel height measurement unit (5) performs point cloud scanning on the good-looking product, and the scanned data is transmitted to the host computer control system (8), and the host computer control system (8) performs flow channel height measurement to complete the detection.

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