Metal bipolar plate surface defect detection equipment based on machine vision

Abstract

The invention relates to metal bipolar plate surface defect detection equipment based on machine vision, and the equipment comprises a transmission device which is used for bearing a to-be-detected bipolar plate and conveying the to-be-detected bipolar plate; the turnover device is used for turning over the bipolar plate to be tested; the device comprises a base support, a camera, a light source and an adjustable light source support, the camera is fixed on the base support through the camera support, and the light source is installed on the base support through the adjustable light source support; the position and the posture of the light source are adjusted under the action of the adjustable light source support. Compared with the prior art, the multi-degree-of-freedom light source is arranged, so that the irradiation effect of the light source is improved, the imaging quality of the camera is improved, and the detection accuracy and precision are improved.

Description

Technical Field

[0001] The present invention relates to the field of bipolar plate surface defect detection, and in particular to a metal bipolar plate surface defect detection device based on machine vision. Background Art

[0002] Proton exchange membrane fuel cells stand out among various fuel cells for their high efficiency, fast startup, low operating temperature, and near-zero emissions. Proton exchange membrane fuel cells are mainly composed of multiple single cells stacked together, each of which consists of two metal bipolar plates (anode and cathode, respectively) and a membrane electrode assembly. Among them, the bipolar plate is one of its important components, accounting for 60% to 80% of the mass and 15% to 20% of the overall cost, and has important functions such as supporting the membrane electrode assembly, water / heat transmission, and gas flow channels.

[0003] At present, most metal bipolar plates are formed by compression molding. Because the pressure of the upper and lower molds during the compression molding process causes the metal plate to deform, bipolar plates with appearance defects are inevitable during the production process. Common defects in bipolar plate stamping include: (a) uneven materials (b) cracks (c) scratches (d) bumps and concave spots. These defects not only affect the appearance of the product, but also have great harm to its performance and service life. At the least, they affect the working efficiency of the fuel cell, and at the worst, they cause safety accidents such as fuel cell leakage.

[0004] Faced with the growing market demand, many factories have realized large-scale production of fuel cell plates. Limited by the current level of industrial visual inspection, most manufacturers lack high-precision, low-cost and relatively integrated surface defect automatic inspection equipment. Therefore, manual inspection is usually used in the production line, but the inspection is time-consuming, and the staff fatigue and other shortcomings lead to high false detection rate and missed detection rate.

[0005] In this regard, some existing technologies use automated detection technology of machine vision to detect surface defects of bipolar plates. For example, Chinese patent CN104833925A discloses a method and system for detecting bipolar plates of fuel cells based on machine vision. The detection system includes: a bipolar plate conveying device for conveying and sorting bipolar plates of fuel cells before detection, a bipolar plate image acquisition device, and a bipolar plate image processing device; the bipolar plate image acquisition device acquires images of the bipolar plates of fuel cells and transmits them to the bipolar plate image processing device; the bipolar plate image processing device compares the acquired images with the standard images of the bipolar plates, and if the image difference with the standard images of the bipolar plates is within the allowable matching error range, the acquired images are optimized; based on the optimized images, the parameters of the bipolar plates of fuel cells are obtained.

[0006] The above detection method and system propose a bipolar plate surface information detection method and system based on machine vision for the currently used fuel cell bipolar plates, so as to realize online detection and reduce the misuse rate and production cost of the bipolar plates. However, since the surface of the bipolar plate is provided with protrusions or depressions for forming flow channels, it is different from the traditional bipolar plates. At present, in order to realize the miniaturization and life extension of fuel cells, the design of the flow channel is more complicated, and it is often no longer a simple vertical and horizontal structure, but has an inclination at any angle. At the same time, the edge of the flow channel is not only perpendicular to the base surface of the bipolar plate, but also has an inclined surface or even an arc. Based on the machine-based detection method, the posture of the bipolar plate cannot be freely adjusted like the manual method. Even if a wide-angle high-precision lens is introduced, the detection accuracy will be low due to lighting problems. Summary of the invention

[0007] The purpose of the present invention is to provide a metal bipolar plate surface defect detection device based on machine vision. By setting a light source with multiple degrees of freedom, the illumination effect of the light source can be improved, thereby improving the imaging quality of the camera and improving the accuracy and precision of the detection.

[0008] The purpose of the present invention can be achieved by the following technical solutions:

[0009] A metal bipolar plate surface defect detection device based on machine vision, comprising:

[0010] A transmission device, used for carrying and transmitting the bipolar plate to be tested;

[0011] A flipping device, used for flipping the bipolar plate to be tested;

[0012] A base bracket, a camera, a light source and an adjustable light source bracket, wherein the camera is fixed to the base bracket via the camera bracket, and the light source is installed on the base bracket via the adjustable light source bracket;

[0013] The position and posture of the light source are adjusted under the action of the adjustable light source bracket.

[0014] The adjustable light source bracket includes a light source mounting bar, a light source direct connection rod group, a light source auxiliary support frame, a light source latch, a latch, a light source main support frame and a light source holder, and the light source direct connection rod group includes a light source connecting member, a light source connecting movable member, a light source connecting auxiliary rod, a second rotating shaft, a light source connecting rotating rod, a first nut and a slider.

[0015] The light source holder is sleeved on the base bracket and slides along the base bracket in a vertical direction, the light source main support frame is fixed on the light source holder and is provided with a first slide groove, the light source auxiliary support frame is provided with a second slide groove, and its first end is set in the first slide groove of the light source main support frame through a pin and slides along the first slide groove, the slider is set in the second slide groove of the light source auxiliary support frame through another pin and slides along the second slide groove, the light source connecting rod is connected to the slider through a first nut and rotates around the first nut, one end of the light source connecting auxiliary rod is connected to the light source connecting rod through a second rotating shaft, the light source is set on the light source connecting member, and the light source connecting member is connected to the other end of the light source connecting auxiliary rod through the light source connecting movable member, the first slide groove is parallel to the conveying direction of the transmission device, the second slide groove is perpendicular to the first slide groove and parallel to the horizontal plane, the first nut is parallel to the first slide groove, the second rotating shaft is perpendicular to the first nut and perpendicular to the light source connecting rod, and the rotating shaft of the light source connecting member is perpendicular to the second rotating shaft and perpendicular to the light source connecting auxiliary rod.

[0016] The light source is a bar-shaped light source, and the light source connecting piece is in a bar shape.

[0017] The light source connecting member includes a first connecting plate and a second connecting plate, the second connecting plate and the first connecting plate are vertically arranged, the side edge of the second connecting plate is fixed on the surface of the first connecting plate, and the plane where the second connecting plate is located divides the first connecting plate into a first part and a second part, the second part of the first connecting plate is connected to the light source connecting movable member, the first part of the first connecting plate and the second connecting plate form a space for fixing the light source mounting strip, the second part of the first connecting plate and the second connecting plate form a buffer space directly with the light source connecting sub-rod, the second connecting plate and the first part of the first connecting plate are provided with a first screw hole, after the light source mounting strip is placed in the space formed by the first part of the first connecting plate and the second connecting plate, it is fixed by a screw passing through the first screw hole.

[0018] The light source connecting sub-rod includes a sub-rod main section and a sub-rod connecting section, one end of the sub-rod main section is connected to the light source connecting rotating rod through a second rotating shaft, and the other end is connected to the sub-rod connecting section, the thickness of the sub-rod connecting section is consistent with that of the sub-rod main section, and the width is greater than that of the sub-rod main section, the sub-rod connecting section includes a third rotating shaft and a first cavity, the light source connecting movable part is cylindrical, and a concentrically arranged cylindrical through hole is provided in the light source connecting movable part, the inner diameter of the cylindrical through hole is consistent with the outer diameter of the third rotating shaft, the light source connecting movable part is sleeved on the third rotating shaft and the side wall passes through the first cavity, and the light source connecting part is arranged parallel to the third rotating shaft.

[0019] The transmission device comprises a bottom plate and two conveying modules arranged in parallel on the bottom plate, the conveying modules are arranged on the bottom plate, and the turning device is arranged on the bottom plate and located between the two conveying modules.

[0020] The conveying module comprises a bracket and a conveying belt arranged on the bracket.

[0021] The flipping device comprises a suction cup, a cylinder, a suction cup connecting plate, a connecting rod, a second flipping shaft, a suction cup connecting plate, a first flipping shaft and a flipping frame;

[0022] The flip frame is fixed on the bottom plate, one end of the connecting rod is connected to the flip frame through a first flip shaft, and the other end is connected to the suction cup connecting plate through a second flip shaft, the suction cup and the cylinder are both arranged on the suction cup connecting plate, and the second shaft is perpendicular to the conveying direction of the transmission device and parallel to the horizontal plane;

[0023] After the suction cup absorbs the bipolar plate to be tested from below, the bipolar plate to be tested is flipped over by rotating the first flip shaft and placed on the other end of the transmission device.

[0024] The apparatus also includes a sensor for detecting the bipolar plate to be tested.

[0025] The camera is an 8k line scan camera.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. By setting a light source with multiple degrees of freedom, the illumination effect of the light source can be improved, thereby improving the imaging quality of the camera and improving the accuracy and precision of detection.

[0028] 2. Through the specially designed structure, the posture of the light source can be adjusted from three dimensions of vertical, horizontal and deep as well as multiple angles. With the strip-shaped light source, it can adapt to the surface of more advanced special-shaped bipolar plates. The light source and the detected area always present a pre-configured target angle, so that the detected area is in the best lighting state, which greatly improves the imaging quality of the camera.

[0029] 3. The light source connecting piece includes a first connecting plate and a second connecting plate. Through the designed cross structure, the light source connecting piece can be fixed while providing sufficient rotation space, thereby improving the position adjustment range of the light source.

[0030] 4. The thickness of the auxiliary rod connecting section is consistent with that of the auxiliary rod main section, and the width is greater than that of the auxiliary rod main section, thereby improving the load-bearing capacity. When fixing a larger light source, the strength and stability can be improved, thereby avoiding damage to the bipolar plate to be tested.

[0031] 5. The flipping device is arranged on the bottom plate and located between the two conveying modules. Combined with the method of using a suction cup to absorb the bipolar plate to be tested from below, it can improve space utilization and reduce the volume of the overall equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of the present invention;

[0033] Figure 2 is a schematic diagram of a transmission device;

[0034] Figure 3 is a schematic diagram of a flipping device;

[0035] Figure 4 This is a schematic diagram of an adjustable light source bracket;

[0036] Figure 5 This is an enlarged schematic diagram of the details of the adjustable light source bracket;

[0037] Wherein: 1. adjustable light source bracket, 2. flip device, 3. conveying device, 4. light source, 5. camera bracket, 6. camera, 7. lens, 8. sensor, 9. base bracket, 101. light source, 102. light source directly connected to rod group, 103. light source auxiliary support frame, 104. light source latch, 105. latch, 106. light source main support frame, 107. light source clamp, 102-1. light source connecting part, 102-2. light source connecting movable part, 102-3. light source connecting auxiliary rod, 102-5. light source connecting rotating rod, 102-6. first nut, 201. suction cup, 202. suction cup connecting plate, 203. connecting rod, 204. second flip shaft, 205. first flip shaft, 301. bottom plate, 302. conveyor belt. DETAILED DESCRIPTION

[0038] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0039] A metal bipolar plate surface defect detection device based on machine vision, such as Figure 1 As shown, including:

[0040] Transmission device 3, used for carrying and transporting the bipolar plate to be tested;

[0041] A flipping device 2, used for flipping the bipolar plate to be tested;

[0042] A base bracket 9, a camera 6, a light source 4 and an adjustable light source bracket 1, wherein the camera 6 is fixed to the base bracket 9 through the camera bracket, and the light source 4 is installed on the base bracket 9 through the adjustable light source bracket 1;

[0043] The position and posture of the light source 4 are adjusted under the action of the adjustable light source bracket 1 .

[0044] like Figure 4 and Figure 5 As shown, the adjustable light source bracket 1 includes a light source mounting strip 101, a light source direct connection rod group 102, a light source auxiliary support frame 103, a light source latch 104, a latch 105, a light source main support frame 106 and a light source holder 107. The light source direct connection rod group 102 includes a light source connecting member 102-1, a light source connecting movable member 102-2, a light source connecting auxiliary rod 102-3, a second rotating shaft 102-4, a light source connecting rotating rod 102-5, a first nut 102-6 and a slider.

[0045] The light source clamp 107 is sleeved on the base bracket 9 and slides along the base bracket 9 in the vertical direction. The main light source support frame 106 is fixed on the light source clamp 107 and is provided with a first slide groove. The light source auxiliary support frame 103 is provided with a second slide groove, and its first end is set in the first slide groove of the main light source support frame 106 through a pin 105 and slides along the first slide groove. The slider is set in the second slide groove of the light source auxiliary support frame 103 through another pin 105 and slides along the second slide groove. The light source connecting rotary rod 102-5 is connected to the slider through a first nut 102-6 and rotates around the first nut 102-6. One end of the light source connecting auxiliary rod 102-3 The light source connecting rotating rod 102-5 is connected through the second rotating shaft 102-4, the light source 4 is arranged on the light source connecting member 102-1, the light source connecting member 102-1 is connected to the other end of the light source connecting sub-rod 102-3 through the light source connecting movable member 102-2, the first slide groove is parallel to the conveying direction of the transmission device 3, the second slide groove is perpendicular to the first slide groove and parallel to the horizontal plane, the first nut 102-6 is parallel to the first slide groove, the second rotating shaft 102-4 is perpendicular to the first nut 102-6 and perpendicular to the light source connecting rotating rod 102-5, and the rotating axis of the light source connecting member 102-1 is perpendicular to the second rotating shaft 102-4 and perpendicular to the light source connecting sub-rod 102-3.

[0046] Through the above design, the posture of the light source can be adjusted from three dimensions of length, width and depth as well as multiple angles. With the help of the strip-shaped light source, it can adapt to the surface of more advanced special-shaped bipolar plates. The light source and the detected area always present a pre-configured target angle, so that the detected area is in the best lighting state, which greatly improves the imaging quality of the camera. For example, in this embodiment, the selected lighting angle is 60 degrees, which has great advantages in uniform brightness, improved recognition and reflection control.

[0047] Generally, the light source 4 is a bar light source. Similarly, the light source connector 102-1 is in a bar shape, so that it can illuminate in parallel with the shape of the flow channel, improving uniformity while also reducing the illuminated area, thereby saving more energy. The light source 4 used is a white LED bar light source, which is firmly fixed by the combined action of the clamping device and the multi-stage rods, and can move freely in six degrees of freedom to achieve the best lighting effect.

[0048] In some embodiments, the light source connector 102-1 includes a first connector plate and a second connector plate, the second connector plate and the first connector plate are vertically arranged, the side edge of the second connector plate is fixed on the surface of the first connector plate, and the plane where the second connector plate is located divides the first connector plate into a first part and a second part, the second part of the first connector plate is connected to the light source connecting movable part 102-2, the first part of the first connector plate and the second connector plate form a space for fixing the light source mounting bar 101, the second part of the first connector plate and the second connector plate form a buffer space directly with the light source connecting sub-rod 102-3, the second connector plate and the first part of the first connector plate are provided with a first screw hole, and the light source mounting bar 101 is placed in the space formed by the first part of the first connector plate and the second connector plate, and is fixed by a screw passing through the first screw hole. In this way, through the designed cross structure, it is possible to provide sufficient rotation space while fixing the light source connector 102-1, thereby improving the position adjustment range of the light source, and also improving the connection strength.

[0049] In addition, in some embodiments, the light source connecting sub-rod 102-3 includes a sub-rod main section and a sub-rod connecting section, one end of the sub-rod main section is connected to the light source connecting rotating rod 102-5 through the second rotating shaft 102-4, and the other end is connected to the sub-rod connecting section, the thickness of the sub-rod connecting section is consistent with that of the sub-rod main section, and the width is greater than that of the sub-rod main section, the sub-rod connecting section includes a third rotating shaft and a first cavity, the light source connecting movable part 102-2 is cylindrical, and a concentrically arranged cylindrical through hole is provided in the light source connecting movable part 102-2, the inner diameter of the cylindrical through hole is consistent with the outer diameter of the third rotating shaft, the light source connecting movable part 102-2 is sleeved on the third rotating shaft and the side wall passes through the first cavity, the light source connecting part 102-1 is arranged parallel to the third rotating shaft, so that on the one hand, the load-bearing capacity can be improved, and when fixing a larger light source, the strength and stability can be improved, thereby avoiding damage to the bipolar plate to be tested, and on the other hand, the compactness of the structure can be improved.

[0050] In addition, if Figure 2 As shown, the transmission device 3 includes a bottom plate 301 and two conveying modules arranged in parallel on the bottom plate 301 , the conveying modules are arranged on the bottom plate 301 , and the turning device 2 is arranged on the bottom plate 301 and located between the two conveying modules.

[0051] The conveying module includes a bracket and a conveyor belt 302 arranged on the bracket. In this embodiment, the conveyor belt 302 used has a flat surface, is precisely processed, has a low friction coefficient and high rigidity, and has a 10 cm interval in the middle to ensure that both ends of the bipolar plate are placed on the conveyor belt, while the middle is suspended so that it can be adsorbed by the suction cup of the flipping mechanism to flip the bipolar plate. The appropriate spacing design allows the plate to be supported stably without obvious deformation in the middle. The conveyor belt is driven by a servo motor, and the above structures are fixed on the base bracket. This solution uses a conveyor belt for transportation, making subsequent assembly line modification more convenient. Size: 55×35cm.

[0052] Furthermore, in some embodiments, Figure 3 As shown, the flip device 2 includes a suction cup 201, a cylinder, a suction cup connecting plate 202, a connecting rod 203, a second flip shaft 204, a suction cup connecting plate, a first flip shaft 205 and a flip frame;

[0053] The flip frame is fixed on the bottom plate 301, one end of the connecting rod 203 is connected to the flip frame through the first flip shaft 205, and the other end is connected to the suction cup connecting plate 202 through the second flip shaft. The suction cup 201 and the cylinder are both arranged on the suction cup connecting plate 202, and the second shaft is perpendicular to the conveying direction of the transmission device 3 and parallel to the horizontal plane;

[0054] After the suction cup 201 absorbs the bipolar plate to be tested from below, the bipolar plate to be tested is flipped over by rotating the first flip shaft 205 and placed on the other end of the transmission device 3 .

[0055] The flipping device is arranged on the bottom plate and located between the two conveying modules. Combined with the method of using a suction cup to absorb the bipolar plate to be tested from below, it can improve space utilization and reduce the volume of the overall equipment.

[0056] In a preferred embodiment of the device for detecting surface defects of metal bipolar plates based on machine vision provided by the present invention, the flipping device 2 is used to automatically flip the bipolar plate to achieve double-sided detection of bipolar plate defects. The device is a two-degree-of-freedom robotic arm. The suction cup 201 adopts a square fully enclosed rubber suction cup to ensure stable adsorption and flipping. The suction cup is controlled by a cylinder to effectively fix and release the object through air pressure difference and negative pressure effect. By adjusting the air pressure, the size of the adsorption force can be easily controlled to adapt to the fixing and release requirements of plates of different weights.

[0057] In addition, in this embodiment, the device also includes a sensor 8 for detecting the bipolar plate to be tested.

[0058] Camera 6 is an 8k line scan camera, MS-×GL83M. Through the coordinated fixation of plates and rods that match its structure, under their joint action, three degrees of freedom can be adjusted to adjust the position, angle, direction and height of the camera. Fine adjustments can be made to meet the needs of specific viewing angles. The fastening device is used to fix the camera on the bracket to prevent the camera from moving or shaking. The structure is installed on the lifting and adjusting device. In addition, the lens used is selected as model FM-LF6040M-M72, and the object distance is selected as 400mm, which can not only ensure the detection range and detection accuracy, but also will not affect the flipping mechanism. However, the specific values ​​still need to be adjusted on the actual mechanism. The structure is installed on the lifting and adjusting device. In addition, the base bracket is specifically a support rod.

[0059] like Figure 1 As shown, when the movement starts, the bipolar plate placed on the conveyor belt 302 moves with the conveyor belt 302 to the top of the suction cup, during which the camera 6 performs shooting and scanning. When the plate moves to the top of the suction cup, after the sensor 8 recognizes it, the suction cup 201 starts to operate under the action of the cylinder, adsorbs the bipolar plate, and starts the flipping movement. In the first stage, the suction cup connecting plate 202 rotates 120° around the fulcrum while the connecting rod 203 remains horizontal. Then the second stage begins, in which the suction cup connecting plate 202 and the connecting rod 203 rotate simultaneously. At the end, the suction cup connecting plate 202 rotates 49°, the connecting rod 203 rotates 120°, and the bipolar plate is flipped and located directly above the conveyor belt. At this time, the suction cup cylinder is closed, the bipolar plate is placed on the conveyor belt 302 and moves with it, and after the sensor 8 recognizes it, it takes a reverse shot.

[0060] In addition, for the sensor 8, when the bipolar plate follows the conveyor belt 302 to move under the sensor 8, the sensor 8 scans and reads the information of the two-dimensional code on the plate, and starts timing immediately when the two-dimensional code is read. If the time when the two-dimensional code is read is recorded as 0, the subsequent movement steps should meet the following table:

[0061] 0s 6s 8s 10s 11s 12s Pulley / Switch 1 1 1 1 1 1 Motor 1 / angle 0° 0° 120° 169° 60° 0° Motor 2 / angle 0° 0° 0° 180° 0° 0° Cylinder / Switch 0 1 1 1 0 0

[0062] At 12 seconds, all components except the pulley have stopped moving. After that, if the sensor 8 detects that a new pole plate has passed, a new round of movement cycle will start, thereby ensuring that the bipolar plate is aligned and detected when it is transported to the optimal position.

[0063] If the above functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program code.

Claims

1. A metal bipolar plate surface defect detection device based on machine vision, characterized in that: include: A transmission device (3), used for carrying and transporting the bipolar plate to be tested; A flipping device (2), used for flipping the bipolar plate to be tested; A base bracket (9), a camera (6), a light source (4) and an adjustable light source bracket (1), wherein the camera (6) is fixed to the base bracket (9) via the camera bracket, and the light source (4) is installed on the base bracket (9) via the adjustable light source bracket (1); The position and posture of the light source (4) are adjusted under the action of the adjustable light source bracket (1).

2. The metal bipolar plate surface defect detection device based on machine vision according to claim 1, characterized in that: The adjustable light source bracket (1) comprises a light source mounting strip (101), a light source direct connection rod group (102), a light source auxiliary support frame (103), a light source latch (104), a latch (105), a light source main support frame (106) and a light source holder (107); the light source direct connection rod group (102) comprises a light source connecting member (102-1), a light source connecting movable member (102-2), a light source connecting auxiliary rod (102-3), a second rotating shaft (102-4), a light source connecting rotating rod (102-5), a first nut (102-6) and a sliding block. The light source holder (107) is sleeved on the base bracket (9) and slides along the base bracket (9) in a vertical direction. The light source main support frame (106) is fixed on the light source holder (107) and is provided with a first slide groove. The light source auxiliary support frame (103) is provided with a second slide groove, and its first end is set in the first slide groove of the light source main support frame (106) through a latch (105) and slides along the first slide groove. The slider is set in the second slide groove of the light source auxiliary support frame (103) through another latch (105) and slides along the second slide groove. The light source connecting rotating rod (102-5) is connected to the slider through a first nut (102-6) and rotates around the first nut (102-6). One end of the light source connecting auxiliary rod (102-3) is connected to the slider through a first nut (102-6). The second rotating shaft (102-4) is connected to the light source connecting rotating rod (102-5), the light source (4) is arranged on the light source connecting member (102-1), the light source connecting member (102-1) is connected to the other end of the light source connecting auxiliary rod (102-3) through the light source connecting movable member (102-2), the first slide groove is parallel to the conveying direction of the transmission device (3), the second slide groove is perpendicular to the first slide groove and parallel to the horizontal plane, the first nut (102-6) is parallel to the first slide groove, the second rotating shaft (102-4) is perpendicular to the first nut (102-6) and perpendicular to the light source connecting rotating rod (102-5), and the rotating shaft of the light source connecting member (102-1) is perpendicular to the second rotating shaft (102-4) and perpendicular to the light source connecting auxiliary rod (102-3).

3. The metal bipolar plate surface defect detection device based on machine vision according to claim 2, characterized in that: The light source (4) is a bar-shaped light source, and the light source connecting member (102-1) is in a bar shape.

4. The metal bipolar plate surface defect detection device based on machine vision according to claim 3 is characterized in that: The light source connecting member (102-1) comprises a first connecting plate and a second connecting plate, the second connecting plate and the first connecting plate are arranged vertically, the side edge of the second connecting plate is fixed on the surface of the first connecting plate, and the plane where the second connecting plate is located divides the first connecting plate into a first part and a second part, the second part of the first connecting plate is connected to the light source connecting movable member (102-2), the first part of the first connecting plate and the second connecting plate form a space for fixing the light source mounting strip (101), the second part of the first connecting plate and the second connecting plate form a buffer space directly with the light source connecting sub-rod (102-3), the second connecting plate and the first part of the first connecting plate are provided with a first screw hole, and after the light source mounting strip (101) is placed in the space formed by the first part of the first connecting plate and the second connecting plate, it is fixed by a screw passing through the first screw hole.

5. The metal bipolar plate surface defect detection device based on machine vision according to claim 2, characterized in that: The light source connecting auxiliary rod (102-3) comprises an auxiliary rod main section and an auxiliary rod connecting section. One end of the auxiliary rod main section is connected to the light source connecting rotating rod (102-5) via a second rotating shaft (102-4), and the other end is connected to the auxiliary rod connecting section. The thickness of the auxiliary rod connecting section is consistent with that of the auxiliary rod main section, and the width is greater than that of the auxiliary rod main section. The auxiliary rod connecting section comprises a third rotating shaft and a first cavity. The light source connecting movable part (102-2) is cylindrical, and a concentrically arranged cylindrical through hole is provided in the light source connecting movable part (102-2). The inner diameter of the cylindrical through hole is consistent with the outer diameter of the third rotating shaft. The light source connecting movable part (102-2) is sleeved on the third rotating shaft and the side wall passes through the first cavity. The light source connecting part (102-1) is arranged parallel to the third rotating shaft.

6. The metal bipolar plate surface defect detection device based on machine vision according to claim 1, characterized in that: The transmission device (3) comprises a base plate (301) and two transmission modules arranged in parallel on the base plate (301), wherein the transmission modules are arranged on the base plate (301), and the turning device (2) is arranged on the base plate (301) and located between the two transmission modules.

7. The metal bipolar plate surface defect detection device based on machine vision according to claim 6, characterized in that: The conveying module comprises a support and a conveying belt (302) arranged on the support.

8. The metal bipolar plate surface defect detection device based on machine vision according to claim 6, characterized in that: The turning device (2) comprises a suction cup (201), a cylinder, a suction cup connecting plate (202), a connecting rod (203), a second turning shaft (204), a suction cup connecting plate, a first turning shaft (205) and a turning frame; The flip frame is fixed on the bottom plate (301), one end of the connecting rod (203) is connected to the flip frame via a first flip shaft (205), and the other end is connected to the suction cup connecting plate (202) via a second flip shaft, the suction cup (201) and the cylinder are both arranged on the suction cup connecting plate (202), and the second shaft is perpendicular to the conveying direction of the transmission device (3) and parallel to the horizontal plane; After the suction cup (201) absorbs the bipolar plate to be tested from below, the bipolar plate to be tested is flipped over by rotating the first flip shaft (205) and placed on the other end of the transmission device (3).

9. The metal bipolar plate surface defect detection device based on machine vision according to claim 8, characterized in that: The device also includes a sensor (8) for detecting the bipolar plate to be tested.

10. The metal bipolar plate surface defect detection device based on machine vision according to claim 8, characterized in that: The camera (6) is an 8k line scan camera.

Images