An AOI detection device and method for membrane electrode carbon paper

Abstract

This invention provides an AOI (Automated Inspection) device and method for membrane electrode carbon paper, comprising a feeding bin, a picking mechanism, an inspection platform, an inspection mechanism, and a unloading machine. The feeding bin is used to hold the membrane electrode carbon paper. The inspection platform includes a front platform, a back platform, and a flipping structure. The picking mechanism is used to detect whether the paper on the outermost surface of the feeding bin is membrane electrode carbon paper. If the picking mechanism determines that the paper is membrane electrode carbon paper, it picks up the paper and places it on the front platform. The flipping structure drives the front platform to transfer the membrane electrode carbon paper from the front platform to the back platform. The inspection mechanism is used to identify defects on the front and back sides of the membrane electrode carbon paper. The unloading machine is used to discharge the paper according to the identification results of the inspection mechanism. This invention enables automatic paper feeding, simultaneous detection of multiple defects and dimensions, and automatic classification and unloading based on the inspection results within the same equipment.

Description

Technical Field

[0001] This invention belongs to the field of paper inspection technology, specifically relating to an AOI inspection device and method for membrane electrode carbon paper. Background Technology

[0002] With the rapid development of new energy technologies, the demand for defect detection of membrane electrode carbon paper in fuel cells is becoming increasingly strong. Currently, the surface of membrane electrode carbon paper has defects such as pits, scratches, black spots, and fiber agglomeration. Moreover, these defects are identified manually, and subjective judgments vary greatly. This is not only time-consuming and labor-intensive, but also has a long detection cycle, which seriously restricts the establishment of a carbon paper detection standard system and the improvement of production capacity. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an AOI inspection device for membrane electrode carbon paper, which can automatically feed paper, simultaneously detect multiple defects and dimensions, and automatically classify and unload paper according to the inspection results in the same set of equipment.

[0004] The technical solution adopted in this invention is: an AOI detection device for membrane electrode carbon paper, including a feeding bin, a feeding mechanism, a detection platform, a detection mechanism, and a unloading machine; the feeding bin is used to place membrane electrode carbon paper; multiple layers of membrane electrode carbon paper are placed coaxially, and a sheet of white paper is placed between every two layers of membrane electrode carbon paper;

[0005] The testing platform includes a front platform, a back platform, and a flipping structure;

[0006] The material handling mechanism is used to grab the membrane electrode carbon paper located on the outermost surface of the feeding bin and place it on the front platform;

[0007] The flipping structure drives the front stage to transfer the film electrode carbon paper located on the front stage to the back stage.

[0008] When the membrane electrode carbon paper is placed on the front stage, the front side of the membrane electrode carbon paper faces the detection mechanism; when the membrane electrode carbon paper is placed on the back stage, the back side of the membrane electrode carbon paper faces the detection mechanism.

[0009] The testing agency uses it to identify defects on the front and back sides of the carbon paper for membrane electrodes;

[0010] The feeding machine is used to discharge materials based on the identification results of the testing agency.

[0011] In the above technical solution, the material handling mechanism is used to detect whether the paper placed on the outermost surface of the feeding bin is membrane electrode carbon paper. If the material handling mechanism determines that the paper is membrane electrode carbon paper, the material handling mechanism picks up the membrane electrode carbon paper and places it on the front platform. If the material handling mechanism determines that the paper placed on the outermost surface of the feeding bin is white paper, the material handling mechanism picks up the white paper and removes it from the feeding bin and transfers it to the non-detection platform area.

[0012] In the above technical solution, the front platform and the back platform are arranged side by side on both sides of the flipping structure, and both are equipped with vacuum adsorption function; the flipping structure drives the front platform to rotate around the flipping structure as an axis between directly above the back platform and one side of the back platform; the vacuum adsorption function is activated during the rotation of the front platform to the back platform; when the front platform reaches directly above the back platform, the vacuum adsorption function of the front platform is deactivated, and the vacuum adsorption function of the back platform is activated.

[0013] In the above technical solution, the detection system includes a host computer and a camera system; the camera system is used to acquire images of the membrane electrode carbon paper and send them to the host computer, the host computer identifies defects in the membrane electrode carbon paper based on the images and sends the identification results to the unloading machine.

[0014] In the above technical solution, the camera system includes a front-view camera and a plurality of side-view cameras uniformly arranged around the front-view camera; the front-view lens and the side-view lenses are located above the detection stage; the lens of the front-view camera faces the detection stage; there is an angle between the lens of the side-view camera and the detection stage; the center lines of the lenses of all the side-view cameras intersect at the same point; the shooting range of the front-view camera covers the film electrode carbon paper to be detected.

[0015] The above technical solution also includes a guide rail and a traction mechanism; the traction mechanism is used to drag the guide rail on the detection platform to translate so that the center point of the film electrode carbon paper located on the front or back platform coincides with the detection point; the detection point is the intersection of the center lines of the lens of the side-view camera.

[0016] The above technical solution also includes a surface light source and a line light source; the surface light source is positioned above the testing stage; the light-emitting center surface of the surface light source passes through the testing point; the line light source is positioned above the testing stage and corresponds to the side-view camera; the illumination angle of the line light source is the same as the shooting angle of the corresponding test camera.

[0017] The above technical solution also includes a stage light source, which is distributed along the edge of the detection stage; the light-emitting center plane of the stage light source is parallel to the upper surface of the front stage and the back stage.

[0018] The above technical solution also includes a verification mechanism; the verification mechanism is located on one side of the route from the feeding bin to the front platform for the membrane electrode carbon paper, and is used to determine whether the paper picked up by the picking mechanism is a single sheet and whether it is membrane electrode carbon paper.

[0019] This invention provides an AOI (Automated Optical Inspection) method for membrane electrode carbon paper, comprising the following steps: a material handling mechanism picks up the membrane electrode carbon paper located on the outermost surface of the feeding bin and places it on the front platform; an inspection mechanism identifies defects on the front side of the membrane electrode carbon paper; a flipping structure drives the front platform to transfer the membrane electrode carbon paper located on the front platform to the back platform; the inspection mechanism identifies defects on the back side of the membrane electrode carbon paper; and a discharge machine discharges the material according to the identification results of the inspection mechanism.

[0020] The beneficial effects of this invention are: it enables automatic feeding of membrane electrode carbon paper, simultaneous detection of multiple defects and dimensions, and automatic sorting and unloading based on detection results within the same equipment. This invention can separate the membrane electrode carbon paper from the white paper based on their physical properties. This invention uses a detection platform that automatically flips the paper and a detection system that acquires images of the paper surface to comprehensively identify defects on the paper surface. Through the cooperation of a front platform with adsorption function, a back platform, and a flipping mechanism, this invention ensures effective paper flipping and guarantees the flatness and stability of the membrane electrode carbon paper on the platform, thus ensuring that the acquired images accurately reflect the actual rotation of the membrane electrode carbon paper; and that the paper does not fall off during the flipping process, allowing it to be precisely transferred from the front platform to the corresponding position on the back platform, further ensuring the consistency of the front and back images of the paper acquired by the detection system. This invention, through the design of guide rails and a traction mechanism, ensures that the front and back stages can move according to the progress of the detection process, guaranteeing that the front and back sides of the membrane electrode carbon paper are within the detection area during inspection. This allows the detection system to obtain optimal images, thereby improving detection accuracy. The invention also utilizes a multi-dimensional camera system to capture images of the membrane electrode carbon paper from multiple angles, ensuring diverse paper images and further enhancing detection accuracy. Furthermore, the invention employs diverse light source settings to ensure uniform and sufficient illumination of the surface of the membrane electrode to be inspected, highlighting surface defects and ensuring detection accuracy. Finally, the invention uses a verification device to confirm the properties and state of the membrane electrode carbon paper before it is placed on the front stage, ensuring the accuracy of the detection process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a schematic diagram of the worktable surface of the present invention;

[0023] Figure 3This is a schematic diagram of the detection stage and detection mechanism of the present invention;

[0024] Figure 4 This is a schematic diagram of the testing mechanism of the present invention;

[0025] Figure 5 This is a schematic diagram of the outer cover of the feeding area of ​​the present invention;

[0026] Figure 6 This is a schematic diagram of the material feeding area of ​​the present invention;

[0027] Figure 7 This is a schematic diagram of the outer cover of the material feeding area of ​​the present invention.

[0028] Among them, 1-feeding bin, 2-material handling mechanism, 3-inspection platform, 4-inspection mechanism, 5-unloading machine, 6-unloading bin, 7-workbench, 8-verification mechanism, 9-ion fan, 10-outer cover; 11-equipment cooling fan; 12-fan filter unit, 13-double door, 14-emergency stop button, 15-tricolor alarm light, 16-human-machine interface panel, 17-monitor, 18-keyboard bracket, 19-product unloading port, 20-main air and power supply inlet, 21-tricolor light, 22-material handling door, 23-emergency stop switch; 24-collection basket; 25-unloading platform; 100-feeding area, 200-unloading area;

[0029] 301-Front platform, 302-Back platform, 303-Flipping structure, 304-Drive shaft, 305-Platform light source, 306-Platform support, 307-Light source support, 308-Guide rail, 309-Traction mechanism, 310-Traction platform, 311-First flipping sensor, 312-Second flipping sensor, 313-Flipping positioning component;

[0030] 401-Front-view camera, 402-Side-view camera, 403-Area light source, 404-Line light source, 405-First frame, 406-Second frame, 407-Support column, 408-First bracket, 409-Second bracket, 410-First camera bracket, 411-Second camera bracket; 412-Diagonal brace;

[0031] 701-Dust collection port, 702-Dust collection box, 703-Casers, 704-Foot cups;

[0032] 801 - Distance sensor, 802 - Verification sensor, 803 - Verification bracket. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments to facilitate a clear understanding of the present invention, but these descriptions do not constitute a limitation on the present invention.

[0034] like Figure 1As shown, the present invention provides an AOI inspection device for membrane electrode carbon paper, including a feeding bin 1, a feeding mechanism 2, an inspection platform 3, an inspection mechanism 4, and a unloading machine 5;

[0035] The feeding bin 1 is used to place the membrane electrode carbon paper; the multilayer membrane electrode carbon paper is placed coaxially, and a piece of white paper is placed between every two layers of membrane electrode carbon paper;

[0036] The testing stage 3 includes a front stage 301, a back stage 302, and a flipping structure 303;

[0037] The material handling mechanism 2 is used to detect whether the paper placed on the outermost surface of the feeding bin 1 is membrane electrode carbon paper; if the material handling mechanism 2 determines that the paper is membrane electrode carbon paper, the material handling mechanism 2 grabs the membrane electrode carbon paper and places it on the front platform 301.

[0038] The flipping structure 303 drives the front stage 301 to transfer the film electrode carbon paper located on the front stage 301 to the back stage 302.

[0039] When the membrane electrode carbon paper is placed on the front stage 301, the front side of the membrane electrode carbon paper faces the detection mechanism 4; when the membrane electrode carbon paper is placed on the back stage 302, the back side of the membrane electrode carbon paper faces the detection mechanism 4.

[0040] Inspection unit 4 is used to identify defects on the front and back sides of the membrane electrode carbon paper;

[0041] The feeding machine 5 is used to discharge materials according to the identification results of the detection mechanism 4.

[0042] This specific embodiment is applied to the inspection of carbon paper for membrane electrodes. This invention enables automatic feeding of carbon paper, simultaneous detection of multiple defects and dimensions, and automatic sorting and unloading based on the inspection results, all within the same equipment.

[0043] This invention provides an AOI (Automated Optical Inspection) method for membrane electrode carbon paper, comprising the following steps: a material handling mechanism picks up the outermost sheet of membrane electrode carbon paper located in the feeding bin; the material handling mechanism transfers the membrane electrode carbon paper to a verification mechanism; after the verification mechanism determines that the material picked up by the material handling mechanism is a single sheet of membrane electrode carbon paper, the material handling mechanism places the picked-up membrane electrode carbon paper on the front platform; the detection mechanism identifies defects on the front side of the membrane electrode carbon paper; a flipping structure drives the front platform to transfer the membrane electrode carbon paper located on the front platform to the back platform; the detection mechanism identifies defects on the back side of the membrane electrode carbon paper; and the unloading machine discharges the material according to the identification result of the detection mechanism.

[0044] like Figure 2As shown, when the material handling mechanism 2 determines that the paper placed on the outermost surface of the feeding bin 1 is not membrane electrode carbon paper, the material handling structure picks up the paper and removes it from the feeding bin 1, transferring it to the non-detection platform area. The non-detection platform area is equipped with a collection basket 24 for holding white paper. When the material handling mechanism 2 determines that the picked-up paper is white paper, it places it in the collection basket 24. The collection basket 24 and the front platform 301 are located on opposite sides of the feeding bin 1.

[0045] like Figure 3 As shown, the material handling mechanism 2 includes a host computer, a material handling sensor 203, and a suction mechanism. The material handling sensor 203 is used to acquire the physical property information of the paper placed on the outermost surface of the feeding bin 1 and send it to the host computer. The host computer determines whether the paper is membrane electrode carbon paper based on the information received from the material handling sensor 203. If it is, the host computer drives the suction mechanism to adsorb the membrane electrode carbon paper; if it is not, the host computer drives the suction mechanism to adsorb white paper. The suction mechanism is equipped with different suction cups. The different suction cups are used to adsorb membrane electrode carbon paper and white paper respectively, and their adsorption forces are matched with the physical properties of membrane electrode carbon paper and white paper respectively, ensuring the stability and safety of the suction process, and effectively grasping the paper without damaging it.

[0046] The material handling sensor 203 is a color sensor, located directly above the feeding hopper 1 and fixed to the second frame 406 of the detection mechanism 4 by a bracket. It is used to identify the color of the outermost paper of the paper stack. In this specific embodiment, the host computer determines whether the outermost paper of the paper stack is membrane electrode carbon paper or white paper based on the color information fed back by the material handling sensor 203.

[0047] The collection basket 24 is equipped with cooperating through-beam sensors on both sides; the through-beam sensors communicate with the host computer; when the stack height of the paper in the collection basket 24 blocks the through-beam sensor's beam, the through-beam sensor sends a signal to the host computer. The end of the through-beam sensor is located above the collection basket 24. When the stack height blocks the through-beam sensor's beam, the through-beam sensor transmits an alarm signal through the host computer, prompting manual removal of the collection basket 24.

[0048] The above technical solution also includes a verification mechanism 8; the verification mechanism 8 is located between the front platform 301 and the feeding bin 1.

[0049] like Figure 2As shown, the verification mechanism 8 includes a distance sensor 801, a verification sensor 802, and a verification bracket 803; the distance sensor 801 and the verification sensor 802 are fixed on the verification bracket 803. The material handling structure places the gripped paper in front of the front platform 301, maintaining the gripped state and placing it at the detection point of the verification mechanism 8. The distance sensor 801 is used to detect the thickness of the paper; the verification sensor 802 is used to detect the physical properties of the paper. The verification sensor 802 is a color sensor. The host computer determines whether the gripped paper is a single sheet based on the detection result of the distance sensor 801. The host computer determines whether the gripped paper is membrane electrode carbon paper based on the detection result of the verification sensor 802. If both of the above determinations by the host computer are yes, the host computer drives the material handling structure 2 to place the gripped paper on the front platform 301; if the determination is no, the host computer drives the material handling mechanism 2 to return to the feeding bin position, release the paper, and then pick it up again.

[0050] The pallet of the feeding hopper 1 is vertically movable within the feeding hopper; the pallet is used to hold the membrane electrode carbon paper. The feeding hopper 1 also includes a transmission mechanism; the transmission mechanism 1 is used to drive the pallet of the feeding hopper 1 to move vertically within the feeding hopper 1. The materials inside the feeding hopper 1 are placed on the pallet of the feeding hopper 1. This invention is applicable to material handling scenarios on an assembly line. Materials are generally concentrated in the feeding hopper 1. As materials are gradually removed, the stacking height of the materials on the pallet must decrease. When the extension of the material handling mechanism 2 is less than the decrease in the stacking height of the materials due to environmental factors or its own properties, the pallet is driven to rise, ensuring that the material handling mechanism 2 can contact the materials inside the feeding hopper 1.

[0051] Furthermore, the feeding hopper 1, the unloading mechanism 2, the testing platform 3, the testing mechanism 4, and the collection basket 24 can all be placed on the same workbench 7. An ion fan 9 is installed on one side of the feeding hopper 1. The ion fan 9 blows air to remove static electricity from the surface of the paper stack. The ion fan 9 is fixed to the workbench 7 by a bracket. A dust collection box 702 is installed below the workbench 7 in the area of ​​the testing platform 3. Dust falling on the testing platform 3 is manually swept away, passes through the dust collection port 701 on the workbench 7, and falls into the dust collection box 702. The workbench 7 is supported by a steel frame. Four feet 704 and four casters 703 are fixed at the four corners of the bottom of the steel frame for equipment handling and support.

[0052] The above technical solution also includes operation buttons; the operation buttons are electrically connected to the host computer; the operation buttons include an eject button and an insert button 1. When the feeding hopper 1 is initially used, the operator places the feeding hopper 1 on the slide plate located outside the picking mechanism 2 and presses the insert button. When the host computer determines that the insert button has been pressed, it drives the slide plate to move to the picking area of ​​the picking mechanism 2. When all the material in the feeding hopper 1 has been taken out, the operator presses the eject button 122; when the host computer determines that the eject button 122 has been pressed, it drives the slide plate to move to the outside of the picking mechanism 2, and then the operator removes the feeding hopper 1. The operation buttons can be set on the workbench 7. Handles are provided on both sides of the base of the feeding hopper.

[0053] like Figure 3 As shown, the front platform 301 and the back platform 302 are arranged side by side on both sides of the flipping structure 303, and both are equipped with vacuum adsorption function. The flipping structure 303 drives the front platform 301 to rotate about the flipping structure 303 as an axis between directly above and to one side of the back platform 302. The vacuum adsorption function is activated during the rotation of the front platform 301 as it moves to the back platform 302. When the front platform 301 reaches directly above the back platform 302, the vacuum adsorption function of the front platform 301 is deactivated, and the vacuum adsorption function of the back platform 302 is activated. The front platform 301 and the back platform 302 have the same size, and when the front platform 301 is directly above the back platform 302, they are on the same axis.

[0054] The above technical solution also includes a host computer and a first flip sensor 311 and a second flip sensor 312; the flip sensors are used to detect the rotation angle of the front platform 301. The first flip sensor 311 and the second flip sensor 312 are symmetrically arranged and fixedly installed on the outer side of the tail of the drive shaft 304 of the flip structure 303. A flip positioning component 313 is provided at the tail end of the drive shaft 304 of the flip structure 303. The flip positioning component 312 cooperates with the first flip sensor 311 and the second flip sensor 312 for point position control of the drive shaft 304 rotating at 0° and 180°.

[0055] Specifically, when the front platform 301 and the back platform 302 are placed side by side at a 180-degree angle, the flip positioning component 313 enters the monitoring area of ​​the first flip sensor 311, triggering the first flip sensor 311. Upon receiving the signal from the first flip sensor, the host computer determines that the front platform 301 is located on one side of the back platform 302 and is in a horizontal state. When the front platform 301 is directly above the back platform 302 and they are coaxially arranged, the flip positioning component 313 enters the monitoring area of ​​the second flip sensor 312, triggering the second flip sensor 312. Upon receiving the signal from the second flip sensor, the host computer determines that the front platform 301 is directly above the back platform 302 and is in a horizontal state. The flip sensors, the front platform 301, and the back platform 302 communicate with the host computer; the host computer controls the vacuum adsorption function of the front platform 301 and the back platform 302 to be turned on and off based on the feedback information from the flip sensors.

[0056] The above technical solution also includes a stage light source 305; the stage light source 305 is distributed along the edge of the detection stage 3; the light emission center surface of the stage light source 305 is parallel to the upper surface of the front stage 301 and the back stage 302.

[0057] Specifically, during the defect identification process, the membrane electrode carbon paper is first placed on the front stage 301. After the membrane electrode carbon paper is placed on the front stage 301, the host computer drives the front stage 301 to activate the vacuum adsorption function, ensuring that the membrane electrode carbon paper adheres tightly to the front stage 301 and remains flat and does not shift during the defect identification process. After the detection mechanism 4 completes the defect identification of the membrane electrode carbon paper, the host computer drives the flipping structure 303 to flip the front stage 301 so that it is directly above the back stage 302. The host computer determines the relative position of the front stage 301 and the back stage 302 based on the position information fed back by the two flipping sensors.

[0058] When the front stage 301 reaches directly above the back stage 302, the front stage 301 and the back stage are coaxially opposite each other with a small gap between them, and the film electrode carbon paper is located between the front stage 301 and the back stage 302. Then, the host computer drives the front stage 301 to turn off the vacuum adsorption function and the back stage 302 to turn on the vacuum adsorption function. At this time, the film electrode carbon paper is transferred to the surface of the back stage 302 under the influence of gravity and the adsorption of the back stage 302. The vacuum function of the back stage 302 ensures that the film electrode carbon paper adheres tightly to the back stage 302, ensuring that the film electrode carbon paper remains flat and does not shift during defect identification.

[0059] After the membrane electrode carbon paper is transferred from the front stage 301 to the back stage 302, the host computer drives the flipping mechanism to return the front stage 301 to its initial position, that is, to be placed horizontally on one side of the back stage 302. During the flipping process, the vacuum adsorption function of the front stage 301 remains off. When the front stage 301 returns to its initial position, the vacuum adsorption function is turned on again, and the feeder places the next membrane electrode carbon paper on the front stage 301.

[0060] Preferably, the detection platform 3 further includes a platform support 306, which supports the detection platform 3. The reverse platform 302 and the flipping structure 303 are both fixedly mounted on the top of the platform support 306. When the front platform 301 and the reverse platform 302 are side-by-side, they are supported by the platform support. The front platform 301 and the drive shaft 304 of the flipping structure 303 are fixedly connected. The first flipping sensor and the second flipping sensor are fixed to the platform support. Three platform light sources 305 are distributed along the three edges of the detection platform 3 and fixed to one side of the detection platform 3 by a light source support 307. Since the motor of the flipping structure 303 extends outward along its axis in this specific embodiment, no platform light source 305 is provided on one side of the motor 105 of the flipping structure 303. The platform light source 305 remains on during the use of the paper defect identification device, illuminating the planar area where the front platform 301 and the reverse platform 302 are located, providing an effective light source for the detection system.

[0061] In the above technical solution, the detection system includes a camera system; the camera system is used to acquire images of the membrane electrode carbon paper and send them to the host computer, the host computer identifies the defects of the membrane electrode carbon paper based on the images and sends the identification results to the unloading machine 5.

[0062] The host computer of this invention is equipped with a carbon paper defect identification program. This program performs deep learning and accumulates a large number of defect photos to form a defect photo library. The program compares and matches the images of the membrane electrode carbon paper acquired by the camera with the photos in the defect photo library to identify defects in the membrane electrode carbon paper. If no defects are found, the membrane electrode carbon paper is considered to be qualified.

[0063] like Figure 5As shown, the camera system includes a front-view camera 401, multiple side-view cameras 402 evenly arranged around the front-view camera 401, and a light source. Since the standard size of the membrane electrode carbon paper is 240*140mm, and the maximum size is 450*200mm, when the length of the membrane electrode carbon paper is less than 280mm, one front-view camera is used. The center lines of the lenses of the front-view camera 401 and the side-view cameras 402 intersect at the same point, and the center of the product is located at this point during shooting. When the length of the membrane electrode carbon paper is greater than 280mm, two front-view cameras are used. During shooting, the center of the product is placed directly below the center of the two front-view cameras, and both cameras shoot simultaneously.

[0064] The number of side-view cameras can be set according to the area of ​​the membrane electrode carbon paper, ensuring that their installation positions are evenly distributed and arranged around the detection stage 3. The field of view of all side-view cameras 402 can cover the entire area of ​​the membrane electrode carbon paper. The number and installation position of the front-view cameras 401 and side-view cameras 402 can be adjusted according to the actual area of ​​the membrane electrode carbon paper, but it must be ensured that the focus point of each camera is located on a plane at the center of the support assembly to form a detection area, and that the detection area is on the same plane as the surface of the detection stage 3.

[0065] The light source includes a surface light source 403 and a line light source 404. The light-emitting center surface of the surface light source 403 passes through the intersection of the lens centerlines of all the side-view cameras. The line light source 404 and the side-view cameras 402 are matched in a one-to-one correspondence. The illumination angle of the line light source 404 is the same as the shooting angle of the corresponding test camera. The surface light source 403 mainly provides sufficient direct light source for the front-view camera 401 and the side-view camera 402. The line light source 404 further provides supplementary light source for the side-view camera 402.

[0066] The above technical solution also includes a guide rail 308 and a traction mechanism 309; the traction mechanism 309 is used to drag the guide rail 308 on the detection stage 3 to translate, so that the center point of the film electrode carbon paper located on the front stage or the back stage coincides with the detection point; the detection point is the intersection of the center lines of the front view camera and the side view camera.

[0067] The planar area centered on the detection point is the plane containing the viewfinder area where the detection system can acquire the best image. The position of the detection area is formed by the arrangement of the front-view camera and the side-view camera in the detection system. The front stage 301 or the back stage 302 is moved along the guide rail 308, so that its stage surface enters the detection area. When the front stage 301 or the back stage 302 is in the detection area, that is, the front or back of the film electrode carbon paper is in the detection area, the detection system acquires the image in the detection area, that is, obtains the front or back image of the film electrode carbon paper.

[0068] Specifically, the guide rails 308 include two symmetrically arranged rails; the traction mechanism 309 is located between the two guide rails 308. The platform support 306 and the light source support 307 are both vertically fixed to the traction platform; the traction platform 310 is located above the traction mechanism 309 and the guide rails 308. Four sliders are fixedly arranged at the four corners of the lower surface of the traction platform; the sliders are engaged in the corresponding guide rails 308, that is, two sliders are arranged in each guide rail 308. The traction mechanism 309 drives the sliders to move within the guide rails 308, thereby moving the detection stage 3 located on the traction platform. The drag chain of the traction mechanism 309 is arranged on one side of the traction platform. In this specific embodiment, the movement of the inspection stage is realized through the cooperation of the sliders and the guide rails 308; the position of the inspection stage 3 is effectively controlled by the control of the slider position by the traction mechanism 309. Meanwhile, the two ends of the guide rail 308 can limit the movement of the slider; when the slider moves to the end of the guide rail 308, it is considered that the detection stage 3 has reached the designated position, that is, the front stage 301 or the back stage 302 has reached the detection area. At this time, the center point of the film electrode carbon paper placed on the front stage 301 or the back stage 302 reaches the detection point, thus limiting the movement of the detection stage 3.

[0069] Specifically, when the paper defect identification device is in its initial state, the two sliders located below the front platform 301 are at one end of the guide rail 308, and the two sliders located below the back platform 302 are at the middle of the guide rail 308. At this time, the front platform 301 is located at the feeding point of the feeder, and the center point of the back platform 302 is located at the center point of the detection area. After the feeder places the film electrode carbon paper on the front platform 301, the host computer drives the sliders to slide within the guide rail 308 through the traction mechanism 309, so that the two sliders located below the back platform 302 are at the other end of the guide rail 308, and the two sliders located below the front platform 301 are at the middle of the guide rail 308. At this time, the center point of the front platform 301 is located at the center point of the detection area, and the detection system begins to identify defects on the front of the film electrode carbon paper, that is, the camera system is activated to acquire the front image of the film electrode carbon paper, and the host computer determines whether the film electrode carbon paper has defects based on the image.

[0070] After the front-side defect identification of the membrane electrode carbon paper is completed, the host computer, through the cooperation of the flipping mechanism and the front platform 301, transfers the membrane electrode carbon paper to the back platform 302. After the front platform 301 returns to its original position, the host computer drives the sliders to slide within the guide rail 308 through the traction mechanism 309. This positions the two sliders below the back platform 302 in the middle of the guide rail 308, and the two sliders below the front platform 301 at one end of the guide rail 308. At this time, the center point of the back platform 302 is located at the center point of the detection area, and the front platform 301 is located at the feeding point of the feeder. The detection system begins to identify defects on the back side of the membrane electrode carbon paper, that is, it activates the camera system to acquire an image of the back side of the membrane electrode carbon paper, and the host computer determines whether there are defects in the membrane electrode carbon paper based on the image. At the same time, the feeder places the next sheet of membrane electrode carbon paper on the front platform 301. That is, the identification of defects on the back side of the current sheet and the placement of the next sheet of paper can be performed simultaneously, ensuring high efficiency of the paper process inspection.

[0071] Preferably, the front-view camera 401 is located above the side-view camera 402; multiple surface light sources 403 are located below the side-view camera 402 and evenly distributed around the front-view camera 401; the multiple surface light sources 403 cooperate with each other, and their illumination range covers the entire area of ​​the front stage 301 or the back stage 302 when the center point is located at the detection point; the line light source 404 is located below the surface light sources 403. This specific embodiment uses the above camera setup to capture images of the film electrode carbon paper from both a frontal view and multiple side views, ensuring comprehensive image acquisition of the film electrode carbon paper; and the cooperation of multiple light sources ensures uniform and sufficient illumination of the paper surface in the acquired images, so as to highlight defects on the paper surface and ensure detection accuracy.

[0072] The camera system includes a support assembly; the support assembly includes a first frame 405 and a second frame 406 arranged vertically in parallel, and four support columns 407; the four corners of the first frame 405 and the second frame 406 are respectively fixed to the tops of the four support columns 407; the front-viewing camera 401 is fixed above the center of the first frame 405 by a first bracket 408; the side-viewing camera 402 is fixed between the first frame 405 and the second frame 406 by a second bracket 409; multiple surface light sources 403 are evenly distributed and fixed to the second frame 406; multiple line light sources 404 are evenly distributed and fixed to the second frame 406. The detection stage 3 is located at the center between the four support columns 407. In this specific embodiment, the support assembly provides a reasonable installation position for the camera and light sources, ensuring that the camera and light sources cooperate to effectively acquire images of the film electrode carbon paper. The support assembly also provides placement control for the detection stage 3, and the frame structure ensures that the camera and light sources can surround the detection stage 3. The double-layer frame in the support component ensures that the front-view camera 401, the side-view camera 402, the area light source 403, and the line light source 404 can be reasonably distributed from top to bottom, further ensuring the accuracy and stability of image acquisition.

[0073] Furthermore, the first bracket 408 spans the two opposite sides of the first frame 405. The front-view camera 401 is fixed to the first bracket 408 via the first camera bracket 410, with the lens of the front-view camera 401 facing the detection stage 3. The number, spacing, and installation position of the front-view cameras 401 can be set and adjusted according to the area of ​​the membrane electrode carbon paper, ensuring that the field of view of all front-view cameras 401 can cover the membrane electrode carbon paper. A second bracket 409 extending downwards to the second frame 406 is provided at the midpoint of each side of the first frame 405; that is, there are four second brackets 409 and corresponding side-view cameras 402. A second camera bracket 411 extending towards the center of the support assembly is provided on the second bracket 409, and the side-view cameras 402 are fixed to the second bracket 409 via the second camera bracket 411. Four side-view cameras 402 are evenly distributed in the support assembly. The lenses of the side-view cameras 402 are directly facing the four sides of the membrane electrode carbon paper, and the shooting angle of the side-view cameras 402 forms a 45° angle with the detection area.

[0074] Based on the physical properties of the membrane electrode carbon paper, eight surface light sources 403 can be configured, evenly distributed within the support assembly, and fixed at the four corners and the middle of the four sides of the second frame 406, respectively. The surface light source 403 body is located between the first frame 405 and the second frame 406. Each of the four corners of the second frame 406 is provided with a diagonal brace 412, and the surface light source 403 is fixed at a 45-degree angle to the corresponding diagonal brace or the middle of each side of the second frame 406. Multiple surface light sources 403 cooperate with each other, with their luminous center surfaces passing through the center point of the front stage 301 or the back stage 302, ensuring that their illumination range covers the entire area of ​​the membrane electrode carbon paper to be tested. Four line light sources 404 can be configured, fixed at the middle of the bottom surface of each of the four sides of the second frame 406. The illumination angle of the line light source 404 forms a 45-degree angle with the detection area, consistent with the shooting angle of the corresponding side-view camera 402, providing effective supplementary light.

[0075] The above technical solution also includes multiple feeding bins 6; the feeding machine 5 transfers the carbon paper of the membrane electrode to the corresponding feeding bin 6 based on the identification result, i.e., whether there are defects and the type of defects. Figure 6 As shown, the unloading machine 5 can be a six-axis robot used for unloading products. The robot's gripper is equipped with two Bernoulli suction cups for picking up carbon paper that has already been inspected on the reverse platform 302 and for placing the picked-up carbon paper into the unloading bins 6. The robot base is mounted on the unloading platform 25. There are five unloading bins 6 on both sides of the robot for storing carbon paper of different categories. The unloading bins 6 are located on the upper surface of the unloading platform 25. After the inspection system completes the inspection of the carbon paper, it feeds the results back to the robot, which then classifies the carbon paper and places it into different unloading bins 6 according to the results.

[0076] The unloading bin 6 is equipped with a track mechanism that is completely identical in structure to the loading bin 1. Each unloading bin 6 is equipped with a button box next to it for controlling the pushing out and pushing in of the unloading bin 6.

[0077] like Figure 5As shown, the equipment located on the workbench 7 forms a feeding area 100. The feeding machine is equipped with an outer cover 10, and a fan filter unit 13 is installed on the top of the outer cover 10. The outer cover 10 has double doors 13, each with a brown acrylic inlay in the middle section for easy viewing of the internal operation of the equipment. An emergency stop button 14 is provided on the outer cover 10 for emergency stopping of the feeding machine. A three-color alarm light 15 is installed at the top corner of the outer cover 10 to indicate the working status of the feeding machine. A human-machine interface panel 16 is provided on the outer cover 10, which includes a touch screen, start button, stop button, emergency stop button 14, and temperature and humidity monitoring display 17. The outer cover 10 also has a display 17, a keyboard bracket 18, and a product unloading port 19, facilitating contact between the robotic arm of the unloading machine 5 and the reverse platform 302. A cooling fan 11 is provided inside the outer cover 10, and the outer cover 10 has the main air supply and power supply inlets 20 for the equipment.

[0078] like Figure 7 As shown, the unloading machine 5 and the unloading table, forming the unloading area 200, are both housed within an outer casing 10. The outer casing 10 is equipped with a material retrieval door 22 for removing the unloading bin 6, an emergency stop switch 23 for stopping the unloading machine 5, and a three-color indicator light 21 to show the operating status of the unloading machine 5. A cooling fan 11 is installed inside the outer casing 10 of the unloading machine 5.

[0079] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. An AOI detection device for membrane electrode carbon paper, characterized in that: It includes a feeding hopper, a feeding mechanism, a testing platform, a testing mechanism, and a feeding machine; the feeding hopper is used to place the membrane electrode carbon paper; the multilayer membrane electrode carbon paper is placed coaxially, and a piece of white paper is placed between every two layers of membrane electrode carbon paper; The testing platform includes a front platform, a back platform, and a flipping structure; The material handling mechanism is used to grab the membrane electrode carbon paper located on the outermost surface of the feeding bin and place it on the front platform; The flipping structure drives the front stage to transfer the film electrode carbon paper located on the front stage to the back stage. When the membrane electrode carbon paper is placed on the front stage, the front side of the membrane electrode carbon paper faces the detection mechanism; when the membrane electrode carbon paper is placed on the back stage, the back side of the membrane electrode carbon paper faces the detection mechanism. The testing agency uses it to identify defects on the front and back sides of the carbon paper for membrane electrodes; The feeding machine is used to discharge materials based on the identification results of the testing agency; The detection system includes a host computer and a camera system; the camera system is used to acquire images of the membrane electrode carbon paper and send them to the host computer, the host computer identifies defects in the membrane electrode carbon paper based on the images and sends the identification results to the unloading machine; The camera system includes a front-viewing camera and a plurality of side-viewing cameras evenly arranged around the front-viewing camera; the front-viewing lens and the side-viewing lenses are located above the inspection stage; the lens of the front-viewing camera faces the inspection stage; there is an angle between the lens of the side-viewing cameras and the inspection stage; the center lines of the lenses of all the side-viewing cameras intersect at the same point; the imaging range of the front-viewing camera covers the membrane electrode carbon paper to be inspected; the camera system includes a support assembly; the support assembly includes a first frame and a second frame arranged vertically parallel to each other. It also includes 8 surface light sources, 4 line light sources, and a stage light source; The surface light source provides sufficient direct light for the front-view and side-view cameras. The surface light sources are evenly distributed within the support assembly and are fixed at the four corners of the second frame and the middle of the four sides of the second frame, respectively. The surface light source body is located between the first frame and the second frame. Each of the four corners of the second frame is provided with a diagonal brace, and the surface light source is fixed at a 45-degree angle at the middle of the corresponding diagonal brace and each side of the second frame. Multiple surface light sources cooperate with each other, and their light-emitting center surfaces all pass through the center point of the front or back platform. The line light source is fixed to the middle of the bottom surface of the four sides of the second frame and corresponds to the side-view camera. The illumination angle of the line light source is at a 45° angle with the detection area and is consistent with the shooting angle of the corresponding side-view camera. The stage light source includes three light sources, which are distributed along the three sides of the detection stage. The light-emitting center surface of the stage light source is parallel to the upper surface of the front stage and the back stage. The stage light source is always on during the use of the paper defect identification device, illuminating the planar area where the front stage and the back stage are located.

2. The AOI detection device for membrane electrode carbon paper according to claim 1, characterized in that: The material handling mechanism is used to detect whether the paper placed on the outermost surface of the feeding bin is membrane electrode carbon paper. If the material handling mechanism determines that the paper is membrane electrode carbon paper, it will pick up the membrane electrode carbon paper and place it on the front platform. If the material handling mechanism determines that the paper placed on the outermost surface of the feeding bin is white paper, it will pick up the white paper, remove it from the feeding bin, and transfer it to the non-detection platform area.

3. The AOI detection device for membrane electrode carbon paper according to claim 1, characterized in that: The front platform and the back platform are arranged side by side on both sides of the flipping structure, and both are equipped with vacuum adsorption function. The flipping structure drives the front platform to rotate around the flipping structure as an axis between directly above the back platform and one side of the back platform. The vacuum adsorption function is activated during the rotation of the front platform as it moves to the back platform. When the front platform reaches directly above the back platform, the vacuum adsorption function of the front platform is deactivated, and the vacuum adsorption function of the back platform is activated.

4. The AOI detection device for membrane electrode carbon paper according to claim 1, characterized in that: It also includes a guide rail and a traction mechanism; the traction mechanism is used to drag the guide rail on the detection platform to translate so that the center point of the film electrode carbon paper located on the front or back platform coincides with the detection point; the detection point is the intersection of the center lines of the lens of the side-view camera.

5. The AOI detection device for membrane electrode carbon paper according to claim 1, characterized in that: It also includes a verification mechanism; the verification mechanism is located on one side of the route from the feeding hopper to the front platform for the membrane electrode carbon paper, and is used to determine whether the paper picked up by the picking mechanism is a single sheet and whether it is membrane electrode carbon paper.

6. The detection method of the AOI detection device for membrane electrode carbon paper as described in any one of claims 1-5, characterized in that: The process includes the following steps: the material handling mechanism picks up the membrane electrode carbon paper located on the outermost surface of the feeding bin and places it on the front platform; the detection mechanism identifies defects on the front side of the membrane electrode carbon paper; the flipping structure drives the front platform to transfer the membrane electrode carbon paper located on the front platform to the back platform; the detection mechanism identifies defects on the back side of the membrane electrode carbon paper; and the unloading machine discharges the material according to the identification results of the detection mechanism.

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