Visual inspection system for fuel cell collector plate

Abstract

The utility model relates to the technical field of visual inspection equipment manufacturing, in particular to a visual inspection system for a collector plate of a fuel cell. The multiple material picking and transferring devices can synchronously execute X-direction displacement movement or Y-direction displacement movement, the collector plate can be transferred to the downstream material temporary storage platform from the upstream material temporary storage platform in a stepping mode, and the multiple optical detection devices independently detect the front faces and the back faces of the multiple detection subareas of the collector plate in the short pause position period. Therefore, on one hand, the images of the plurality of optical detection devices synchronously realize full-image acquisition of the plurality of detection subareas of the collector plate, and the respective image acquisition time is relatively short, so that a good foundation can be laid for greatly improving the conveying speed of the collector plate; and on the other hand, the information amount of image data required to be acquired by a single optical detection device is relatively limited, so that the requirements on the image acquisition capability, the image acquisition speed and the data processing capability of the equipped visual detection camera can be effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of visual inspection equipment manufacturing technology, and in particular to a visual inspection system for fuel cell manifolds. Background Technology

[0002] Fuel cells, as highly efficient power generation devices that directly convert the chemical energy of fuel into electrical energy through electrochemical reactions without burning fuel, have received widespread attention and application. The fuel cell current collector is a crucial component of the fuel cell system, playing a key role in concentrating, distributing, and transmitting the electrical energy generated by the fuel cell. A fuel cell current collector is a plate-shaped assembly made of conductive material used to connect multiple individual cells in a fuel cell stack and provide power supply and current distribution functions.

[0003] The fuel cell current collector plate has numerous structural features and forming welds, all subject to extremely stringent forming quality requirements. Regarding the forming welds, based on the functional classification of the fuel cell current collector plate area, they are divided into flow channel area welding and sealing area welding. The corresponding welding materials are mostly metals, and the thickness of a single material is controlled between 0.05 and 0.3 mm. Specifically: the weld surface should be smooth and flat, without obvious weld beads, depressions, porosity, cracks, or other defects; the weld should smoothly transition with the base material, without obvious undercut, lack of fusion, or incomplete penetration; the shape and size of the weld should meet design requirements and not exceed allowable deviations; the weld surface should be free of defects such as incomplete welds, miswelds, and slag inclusions that affect usability and aesthetics. Upstream new energy vehicle manufacturers have recently purchased a batch of vision inspection equipment, mainly consisting of a machine base, a circular conveyor belt, a support fixture, a flipping robot, upstream vision inspection cameras, and downstream vision inspection cameras. The support fixture is used to support individual fuel cell current collector plates. Multiple support fixtures are sequentially arranged on a circular conveyor belt. Under the conveying force from the conveyor belt, fuel cell current collectors pass through the upstream inspection station one by one. During this process, an upstream vision inspection camera captures a complete front image of the fuel cell current collector. Then, a flipping robot performs a 180° flipping operation on the fuel cell current collector, which continues to flow under the conveying force and passes through the downstream inspection station. During this process, a downstream vision inspection camera captures a complete back image of the fuel cell current collector. However, according to feedback from upstream new energy vehicle manufacturers, in practical applications, the inspection effect is unsatisfactory, the inspection efficiency is extremely low, the image processing time is too long, and the data is easily distorted during the processing, leading to frequent false detections and missed detections of weld defects. The reasons for this are as follows: 1) The weld seam distribution area of ​​the fuel cell current collector is relatively large. Limited by the image acquisition capabilities and speed of the equipped vision inspection camera, the running speed of the circular conveyor belt must be slowed down, ultimately affecting inspection efficiency; 2) The amount of image data required to be acquired by a single vision inspection camera is too large. Limited by its data processing capabilities, the required image processing time is too long, and the data is easily distorted during processing; 3) During the image acquisition process, a 180° flipping operation of the fuel cell current collector is required, and the circular conveyor belt must remain paused during this process. This inevitably affects the conveying cycle of the fuel cell current collector to some extent. Furthermore, the objective existence of secondary positioning errors after flipping further affects the stability and accuracy of image acquisition, ultimately adversely impacting image processing speed. Therefore, it is urgent for technical personnel to solve these problems. Utility Model Content

[0004] Therefore, in view of the above-mentioned existing problems and defects, the designers of this utility model collected relevant information, conducted multiple evaluations and considerations, and carried out continuous experiments and modifications by technical personnel with many years of R&D experience in this industry, which ultimately led to the emergence of the visual inspection system for fuel cell manifolds.

[0005] To address the aforementioned technical problems, this utility model relates to a visual inspection system for fuel cell manifolds, belonging to the category of fuel cell manifold visual inspection equipment. The fuel cell manifold is divided into n inspection zones. The fuel cell manifold visual inspection system includes a machine base, a material carrying unit, a material transfer unit, and an optical inspection unit. The material carrying unit, material transfer unit, and optical inspection unit are all handled by the machine base. The material carrying unit consists of an upstream material storage platform, a first visual inspection stage, a second visual inspection stage, ..., an nth visual inspection stage, and a downstream material storage platform, arranged sequentially from upstream to downstream. The material transfer unit includes an X-axis power unit, a Y-axis power unit, and a first material pickup and transfer device, a second material pickup and transfer device, ..., an (n+1)th material pickup and transfer device arranged sequentially from upstream to downstream. The optical inspection unit consists of a first optical inspection device, a second optical inspection device, ..., an nth optical inspection device, and is positioned in a one-to-one correspondence with the first visual inspection stage, the second visual inspection stage, ..., the nth visual inspection stage. Under the coordinated action of the X-axis power unit and the Y-axis power unit, the first material pickup and transfer device, the second material pickup and transfer device, ..., the (n+1)th material pickup and transfer device can synchronously perform X-axis displacement or Y-axis displacement, allowing the fuel cell manifold to flow from the upstream material storage platform to the downstream material storage platform in a step-by-step manner. While stationary on the first visual inspection stage, the second visual inspection stage, ..., the nth visual inspection stage, the first optical inspection device, the second optical inspection device, ..., the nth optical inspection device correspondingly acquires images of the front and back sides of the n inspection zones of the fuel cell manifold.

[0006] As a further improvement to the technical solution disclosed in this utility model, the upstream material storage platform includes a fixed upstream support platform and an upstream adsorption assembly. The upstream adsorption assembly consists of multiple upstream vacuum nozzles that are mounted on the fixed upstream support platform and work together to achieve the adsorption operation of the fuel cell current collector. The downstream material storage platform includes a fixed downstream support platform and a downstream adsorption assembly. The downstream adsorption assembly consists of multiple downstream vacuum nozzles that are mounted on the fixed downstream support platform and work together to achieve the adsorption operation of the fuel cell current collector.

[0007] As a further improvement to the technical solution disclosed in this utility model, the first visual inspection stage, the second visual inspection stage, ..., the nth visual inspection stage have the same design structure. The first visual inspection stage includes a first adjustable leveling support platform and a first pushing mechanism. A first process notch is formed on the machine platform. The first adjustable leveling support platform is hinged to the machine platform and completely covers the first process notch when placed flat. The first pushing mechanism uses the machine platform as its mounting base and passes through the first process notch to apply a dragging force to the first adjustable leveling support platform, thereby changing the tilt angle of the first adjustable leveling support platform.

[0008] As a further improvement to the technical solution disclosed in this utility model, the first pushing mechanism includes a first cylinder, a first support assembly, a first hinge seat, and a first hinge shaft. The first support assembly consists of a first left-side L-shaped support and a first right-side L-shaped support, which are detachably fixed to the machine base and cooperate to support the first cylinder. The piston rod of the first cylinder is hinged to the first adjustable leveling support platform via the first hinge seat and the first hinge shaft. As the piston rod of the first cylinder extends and retracts, its own yaw angle changes, and the tilt angle of the first adjustable leveling support platform changes accordingly.

[0009] As a further improvement to the technical solution disclosed in this utility model, the first material picking and transferring device, the second material picking and transferring device, ..., the (n+1)th material picking and transferring device have the same design structure. The first material picking and transferring device includes a first bearing base, a first linear motion element, a first cantilever beam, and a first adsorption picking fixture. The first bearing base performs XY plane displacement motion under the driving force from the X-direction power unit and the Y-direction power unit. The first adsorption picking fixture is used to adsorb and pick up the fuel cell current collector plate, and it is supported by the first cantilever beam. The first linear motion element is used to drive the first cantilever beam and the first adsorption picking fixture to perform Z-direction displacement motion, and it is mounted on the first bearing base.

[0010] As a further improvement to the technical solution disclosed in this utility model, the first optical inspection device, the second optical inspection device, ..., the nth optical inspection device have the same design structure. The first optical inspection device comprises a first upper AOI visual inspection module and a first lower AOI visual inspection module. The first upper AOI visual inspection module is used to pick up the front image of the fuel cell current collector, and it is located directly above the first visual inspection stage. The first lower AOI visual inspection module is used to pick up the back image of the fuel cell current collector, and it is located directly below the first visual inspection stage and is hidden in the cavity of the machine.

[0011] In practical applications, the fuel cell manifold visual inspection system disclosed in this utility model can achieve at least the following beneficial technical effects, specifically:

[0012] 1) The fuel cell manifold is artificially divided into n detection zones, and in its step-by-step flow process, the first optical detection device, the second optical detection device, ..., the nth optical detection device are used to pick up images in different regions. In this way, the amount of image data information that a single optical detection device needs to collect is relatively limited, which can effectively relax the requirements on the image acquisition capability and image acquisition speed of the equipped visual inspection camera, and can greatly shorten the time required for image processing while ensuring data processing accuracy.

[0013] 2) The first optical inspection device, the second optical inspection device, ..., the nth optical inspection device simultaneously realize the full image acquisition of the n inspection zones of the fuel cell manifold. The image acquisition time required for each is relatively short, which can lay a good foundation for the significant increase in the conveying speed of the fuel cell manifold and help improve the visual inspection efficiency of the fuel cell manifold.

[0014] 3) Also benefiting from the relatively limited amount of image data information to be acquired, a single optical detection device is more conducive to forming a high-quality imaging field of view during the image acquisition process. The acquired images have extremely high clarity, and image distortion is avoided in subsequent image processing.

[0015] 4) The front and back images of the n detection zones of the fuel cell current collector are acquired simultaneously without the need to perform a 180° flipping operation. This not only avoids the error caused by the secondary repositioning of the fuel cell current collector, but also optimizes its delivery cycle. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a three-dimensional schematic diagram of the fuel cell manifold disclosed in this utility model from one perspective (the visual inspection zones are defined by double-dotted lines).

[0018] Figure 2 This is a three-dimensional schematic diagram of the fuel cell manifold disclosed in this utility model from another perspective (the visual inspection zones are defined by double-dotted lines).

[0019] Figure 3 This is a three-dimensional schematic diagram of the visual inspection equipment for fuel cell manifolds disclosed in this utility model.

[0020] Figure 4 This is a three-dimensional schematic diagram from one perspective of the visual inspection system for fuel cell manifolds disclosed in this utility model.

[0021] Figure 5 This is a three-dimensional schematic diagram from another perspective of the visual inspection system for fuel cell manifolds disclosed in this utility model.

[0022] Figure 6 This is a three-dimensional schematic diagram of the machine tool in the visual inspection system for fuel cell manifolds disclosed in this utility model.

[0023] Figure 7 This is a schematic diagram showing the relative positional relationship of a viewpoint between the material carrying unit and the optical detection unit in the visual inspection system for fuel cell manifolds disclosed in this utility model.

[0024] Figure 8 This is a schematic diagram showing the relative positional relationship between the material carrying unit and the optical detection unit from another perspective in the visual inspection system for fuel cell manifolds disclosed in this utility model.

[0025] Figure 9 This is a three-dimensional schematic diagram of the material carrying unit in the visual inspection system for fuel cell manifolds disclosed in this utility model.

[0026] Figure 10 This is a three-dimensional schematic diagram of the upstream material temporary storage platform in the visual inspection system for fuel cell manifolds disclosed in this utility model.

[0027] Figure 11 This is a three-dimensional schematic diagram of the first visual inspection stage in the visual inspection system for fuel cell manifolds disclosed in this utility model.

[0028] Figure 12 This is a three-dimensional schematic diagram of the downstream material temporary storage platform in the visual inspection system for fuel cell manifolds disclosed in this utility model.

[0029] Figure 13 This is a three-dimensional schematic diagram of the material transfer unit from one perspective in the visual inspection system for fuel cell manifolds disclosed in this utility model.

[0030] Figure 14 This is also a three-dimensional schematic diagram of the material transfer unit in the visual inspection system for fuel cell manifolds disclosed in this utility model (with the first material pickup transfer device, the second material pickup transfer device, the third material pickup transfer device, the fourth material pickup transfer device, and the fifth material pickup transfer device all hidden).

[0031] Figure 15This is a three-dimensional schematic diagram of the material transfer unit in the visual inspection system for fuel cell manifolds disclosed in this utility model from another perspective (with the first material pick-up and transfer device, the second material pick-up and transfer device, the third material pick-up and transfer device, the fourth material pick-up and transfer device, and the fifth material pick-up and transfer device all hidden).

[0032] Figure 16 This is a schematic diagram showing the relative positions of the first material picking and transferring device, the second material picking and transferring device, the third material picking and transferring device, the fourth material picking and transferring device, and the fifth material picking and transferring device in the visual inspection system for fuel cell manifolds disclosed in this utility model.

[0033] 1-Machine platform; 11-First process gap; 2-Material carrying unit; 21-Upstream material temporary storage platform; 211-Fixed upstream support platform; 212-Upstream adsorption component; 2121-Upstream vacuum nozzle; 22-First vision inspection stage; 221-First adjustable leveling support platform; 222-First pushing mechanism; 2221-First cylinder; 2222-First support assembly; 22221-First left-side L-shaped support; 22222-First right-side L-shaped support; 2223-First hinge seat; 2224-First hinge shaft; 23-Second vision inspection stage; 24-Third vision inspection stage; 25-Fourth vision inspection stage; 2 6-Downstream material temporary storage platform; 261-Fixed downstream support platform; 262-Downstream adsorption component; 2621-Downstream vacuum nozzle; 3-Material transfer unit; 31-X-direction power unit; 32-Y-direction power unit; 33-First material pickup and transfer device; 331-First support base; 332-First linear motion element; 333-First cantilever beam; 334-First adsorption pickup fixture; 34-Second material pickup and transfer device; 35-Third material pickup and transfer device; 36-Fourth material pickup and transfer device; 37-Fifth material pickup and transfer device; 4-Optical inspection unit; 41-First optical inspection device; 411-First upper-mounted AOI vision inspection module; 412-First lower-mounted AOI vision inspection module; 42-Second optical inspection device; 43-Third optical inspection device; 44-Fourth optical inspection device. Detailed Implementation

[0034] In the description of this utility model, it should be understood that the terms "front", "rear", "left", "right", "up", "down", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] The present invention will be further described in detail below with reference to specific embodiments. Figure 3 A three-dimensional schematic diagram of the visual inspection device for fuel cell manifolds disclosed in this utility model is shown. It can be seen that its main structure is a visual inspection system for fuel cell manifolds, which is used to capture images of the surface structural features and formed welds on the fuel cell manifolds.

[0036] Unlike traditional full-image acquisition methods, in this embodiment, the fuel cell manifold is considered to be divided into 4 independent detection zones (e.g., Figure 1 , 2 As shown in the figure, the division criteria are the structural features contained in each detection zone, the specific number of formed welds, the amount of image detail information, and other factors.

[0037] Figure 4 , Figure 5 The diagrams show two different perspectives of the visual inspection system for fuel cell manifolds disclosed in this utility model. It can be seen that it mainly consists of a machine base 1, a material carrying unit 2, a material transfer unit 3, and an optical inspection unit 4. The material carrying unit 2, material transfer unit 3, and optical inspection unit 4 are all handled by the machine base 1. To accommodate the inspection zoning of the fuel cell manifolds, as shown... Figure 7 , 8 As shown in Figures 9 and 1, the material carrying unit 2 consists of an upstream material temporary storage platform 21, a first visual inspection platform 22, a second visual inspection platform 23, a third visual inspection platform 24, a fourth visual inspection platform 25, and a downstream material temporary storage platform 26, arranged sequentially from upstream to downstream. Figure 13-16 As shown, the material transfer unit 3 includes an X-direction power unit 31, a Y-direction power unit 32, and a first material pick-up and transfer device 33, a second material pick-up and transfer device 34, a third material pick-up and transfer device 35, a fourth material pick-up and transfer device 36, and a fifth material pick-up and transfer device 37 arranged sequentially from upstream to downstream. Similarly, as... Figure 7 , 8 As shown, the optical detection unit 4 is composed of the first optical detection device 41, the second optical detection device 42, the third optical detection device 43, and the fourth optical detection device 44, and is positioned opposite to the first visual detection stage 22, the second visual detection stage 23, the third visual detection stage 24, and the fourth visual detection stage 25 in a one-to-one correspondence.

[0038] In practical applications, batch fuel cell manifolds are placed one by one on the upstream material storage platform 21. Subsequently, under the coordinated action of the X-axis power unit 31 and the Y-axis power unit 32, the first material picking and transferring device 33, the second material picking and transferring device 34, the third material picking and transferring device 35, the fourth material picking and transferring device 36, and the fifth material picking and transferring device 37 can synchronously perform X-axis displacement or Y-axis displacement. The fuel cell manifolds can be transferred from the upstream material storage platform 21 to the downstream material storage platform 26 in a step-by-step manner. While stopped at the first visual inspection stage 22, the second visual inspection stage 23, the third visual inspection stage 24, and the fourth visual inspection stage 25, the first optical inspection device 41, the second optical inspection device 42, the third optical inspection device 43, and the fourth optical inspection device 44 respectively pick up images of the front and back of the four inspection zones of the fuel cell manifolds.

[0039] By adopting the above technical solution, on the one hand, the fuel cell manifold is artificially divided into four independent detection zones. During the brief pauses relative to the first visual detection stage 22, the second visual detection stage 23, the third visual detection stage 24, and the fourth visual detection stage 25, the first optical detection device 41, the second optical detection device 42, the third optical detection device 43, and the fourth optical detection device 44 perform image region picking for each independent detection zone in a corresponding manner. In this way, whether it is the first optical detection device 41, or the second optical detection device 42, the third optical detection device 43, and the fourth optical detection device 44... 4. The amount of image data information that each device needs to collect is relatively limited, which can effectively relax the requirements on the image acquisition capability and image acquisition speed of the equipped visual inspection camera. Moreover, while ensuring the accuracy of data processing, the time required for image processing can be significantly shortened. On the other hand, the first optical inspection device 41, the second optical inspection device 42, the third optical inspection device 43, and the fourth optical inspection device 44 simultaneously realize the full image acquisition of the four inspection zones of the fuel cell manifold, and the time required for image acquisition of each device is relatively short. This can lay a good foundation for a significant increase in the conveying speed of the fuel cell manifold and help improve the visual inspection efficiency of the fuel cell manifold.

[0040] It should also be noted that, thanks to the relatively limited amount of image data to be acquired, the first optical detection device 41, the second optical detection device 42, the third optical detection device 43, and the fourth optical detection device 44 are more conducive to forming a high-quality imaging field of view during the image acquisition process. The acquired images have extremely high clarity, and image distortion is avoided in subsequent image processing.

[0041] As Figure 10 , 12As shown in the figure, the upstream material temporary storage platform 21 is mainly composed of a fixed upstream bearing platform 211 and an upstream adsorption component 212. The downstream material temporary storage platform 26 is mainly composed of a fixed downstream bearing platform 261 and a downstream adsorption component 262. The fixed upstream bearing platform 211 and the fixed downstream bearing platform 261 are both placed flat on the machine table 1 and are fixed in a detachable manner. The upstream adsorption component 212 is composed of multiple upstream vacuum nozzles 2121 that take the fixed upstream bearing platform 211 as the installation base and cooperate to achieve the adsorption operation of the fuel cell current collector plate. The downstream adsorption component 262 is composed of multiple downstream vacuum nozzles 2621 that take the fixed downstream bearing platform 261 as the installation base and cooperate to achieve the adsorption operation of the fuel cell current collector plate. Specifically for the upstream material temporary storage platform 21, in practical applications, when the fuel cell current collector plate is placed in place relative to the fixed upstream bearing platform 211, the multiple upstream vacuum nozzles 2121 generate a negative pressure effect due to the continuous supply of negative pressure gas, and the fuel cell current collector plate can be stably and reliably adsorbed.

[0042] As shown in Figure 9 the figure, the first visual inspection carrier platform 22, the second visual inspection carrier platform 23, the third visual inspection carrier platform 24, and the fourth visual inspection carrier platform 25 have the same design structure and play similar roles in the visual inspection process.

[0043] It is known that when an industrial camera images, it is necessary to ensure that the optical axis is perpendicular to the plane of the fuel cell current collector plate. If it is not installed flat or placed obliquely, it will inevitably cause the optical axis to deviate from the vertical direction, and image distortion will inevitably occur. Moreover, it will also cause distortion of the actual size of the fuel cell current collector plate in the image, thereby affecting the authenticity of the image. In view of this, as a further optimization of the above technical solution, the first visual inspection carrier platform 22, the second visual inspection carrier platform 23, the third visual inspection carrier platform 24, and the fourth visual inspection carrier platform 25配套 with the first optical detection device 41, the second optical detection device 42, the third optical detection device 43, and the fourth optical detection device 44 are all preferably designed with an adjustable inclination structure. Specifically, taking the first visual inspection carrier platform 22 as an example, as Figure 11 shown in the figure, it includes a first adjustable leveling carrier platform 221 and a first pushing mechanism 222. As Figure 6As shown, a first process notch 11 is formed on the machine base 1. A first adjustable leveling support platform 221 is hinged to the machine base 1 and completely covers the first process notch 11 when in a flat position. A first pushing mechanism 222 uses the machine base 1 as its mounting base and passes through the first process notch 11 to apply a dragging force to the first adjustable leveling support platform 221, thereby changing the tilt angle of the first adjustable leveling support platform 221. In this way, on the one hand, after the first optical detection device 41 is assembled in place relative to the machine base 1, the tilt angle of the first adjustable leveling support platform 221 is changed due to the pushing force from the first pushing mechanism 222, ensuring that the perpendicularity of the fuel cell current collector plate placed on it relative to the imaging optical axis meets the expected design requirements; on the other hand, if the imaging quality of the first optical detection device 41 is found to be unqualified during the imaging process, the first pushing mechanism 222 can be used to conveniently and quickly push the first adjustable leveling support platform 221, and the tilt angle of the first adjustable leveling support platform 221 can be changed slightly. During this process, the imaging quality of the first optical detection device 41 can be observed in real time until it meets the expected design requirements.

[0044] It is known that, based on design common sense, the first pushing mechanism 222 can adopt various design structures to push the first adjustable leveling support platform 221. However, a design structure that is simple, easy to manufacture and implement, easy to maintain and repair later, and has a very fast response speed is recommended here. Specifically, as follows: Figure 11 As shown, the first pushing mechanism 222 is mainly assembled from several parts, including a first cylinder 2221, a first support assembly 2222, a first hinge seat 2223, and a first hinge shaft 2224. The first support assembly 2222 consists of a first left-side L-shaped support 22221 and a first right-side L-shaped support 22222, which are detachably fixed to the machine base 1 and cooperate to support the first cylinder 2221. The piston rod of the first cylinder 2221 is hinged to the first adjustable leveling support platform 221 by means of the first hinge seat 2223 and the first hinge shaft 2224. As the piston rod of the first cylinder 2221 extends and retracts, its own yaw angle changes, and the tilt angle of the first adjustable leveling support platform 221 changes accordingly.

[0045] like Figure 16As shown, the first material pickup and transfer device 33, the second material pickup and transfer device 34, the third material pickup and transfer device 35, the fourth material pickup and transfer device 36, and the fifth material pickup and transfer device 37 have the same design structure. Taking the first material pickup and transfer device 33 as an example, it mainly consists of a first supporting base 331, a first linear motion element 332, a first cantilever beam 333, and a first adsorption and pickup fixture 334. The first supporting base 331 also serves as the mounting foundation for the first material pickup and transfer device 33, the second material pickup and transfer device 34, the third material pickup and transfer device 35, the fourth material pickup and transfer device 36, and the fifth material pickup and transfer device 37, and can perform XY plane displacement motion under the driving force from the X-direction power unit 31 and the Y-direction power unit 32. The first adsorption and pickup fixture 334 is used to adsorb and pick up the fuel cell current collector plate, and it is supported by the first cantilever beam 333. The first linear motion element 332 is used to drive the first cantilever beam 333 together with the first adsorption and pickup fixture 334 to perform Z-axis displacement motion, and it is mounted on the first bearing base 331.

[0046] Depend on Figure 14 , 15 As can also be clearly seen in the diagram, both the X-axis power unit 31 and the Y-axis power unit 32 are preferably motor-driven linear modules to ensure that the first material pickup and transfer device 33, the second material pickup and transfer device 34, the third material pickup and transfer device 35, the fourth material pickup and transfer device 36 and the fifth material pickup and transfer device 37 all have microsecond-level response speeds and output accuracy of 0.01%.

[0047] Finally, it should be noted that, as Figure 7 , 8 As shown, the first optical inspection device 41, the second optical inspection device 42, the third optical inspection device 43, and the fourth optical inspection device 44 have the same design structure. Taking the first optical inspection device 41 as an example, it consists of a first upper AOI visual inspection module 411 and a first lower AOI visual inspection module 412. The first upper AOI visual inspection module 411 is used to pick up the front image of the fuel cell current collector, and it is located directly above the first visual inspection stage 22. The first lower AOI visual inspection module 412 is used to pick up the back image of the fuel cell current collector, and it is located directly below the first visual inspection stage 22 and is hidden in the cavity of the machine 1. By adopting the above technical solution, the front and back images of the fuel cell current collector can be acquired without performing a 180° flipping operation during the entire image acquisition process. This not only effectively avoids the error caused by the secondary repositioning of the fuel cell current collector, but also optimizes the conveying cycle of the fuel cell current collector.

[0048] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A visual inspection system for fuel cell manifolds, belonging to the category of visual inspection equipment for fuel cell manifolds; the fuel cell manifold is divided into n inspection zones, characterized in that, The fuel cell manifold visual inspection system includes a machine base, a material carrying unit, a material transfer unit, and an optical inspection unit. The machine base is responsible for all three components: the material carrying unit, the material transfer unit, and the optical inspection unit. The material carrying unit consists of an upstream material storage platform, a first visual inspection stage, a second visual inspection stage, ..., an nth visual inspection stage, and a downstream material storage platform, arranged sequentially from upstream to downstream. The material transfer unit includes an X-axis power unit, a Y-axis power unit, and a first material pickup and transfer device, a second material pickup and transfer device, ..., an (n+1)th material pickup and transfer device arranged sequentially from upstream to downstream. The optical inspection unit consists of the first optical inspection device, the second optical inspection device, ..., the nth optical inspection device, and is positioned correspondingly to each of the first visual inspection stage, the second visual inspection stage, ..., the nth visual inspection stage. Under the coordinated action of the X-axis power unit and the Y-axis power unit, the first material picking and transferring device, the second material picking and transferring device, ..., the (n+1)th material picking and transferring device can synchronously perform X-axis displacement or Y-axis displacement, and the fuel cell manifold can be transferred from the upstream material temporary storage platform to the downstream material temporary storage platform in a stepping manner. While stopped at the first visual inspection stage, the second visual inspection stage, ..., the nth visual inspection stage, the first optical inspection device, the second optical inspection device, ..., the nth optical inspection device perform image picking on the front and back of the n inspection zones of the fuel cell manifold in a one-to-one correspondence.

2. The visual inspection system for fuel cell manifolds according to claim 1, characterized in that, The upstream material storage platform includes a fixed upstream support platform and an upstream adsorption assembly; the upstream adsorption assembly consists of multiple upstream vacuum nozzles that are mounted on the fixed upstream support platform and work together to achieve adsorption operation of the fuel cell manifold; the downstream material storage platform includes a fixed downstream support platform and a downstream adsorption assembly; the downstream adsorption assembly consists of multiple downstream vacuum nozzles that are mounted on the fixed downstream support platform and work together to achieve adsorption operation of the fuel cell manifold.

3. The visual inspection system for fuel cell manifolds according to claim 1, characterized in that, The first visual inspection stage, the second visual inspection stage, ..., the nth visual inspection stage have the same design structure; the first visual inspection stage includes a first adjustable leveling support platform and a first pushing mechanism; a first process notch is formed on the machine platform; the first adjustable leveling support platform is hinged to the machine platform and completely covers the first process notch in a flat state; the first pushing mechanism uses the machine platform as a mounting base and passes through the first process notch to apply a dragging force to the first adjustable leveling support platform, thereby changing the tilt angle of the first adjustable leveling support platform.

4. The visual inspection system for fuel cell manifolds according to claim 3, characterized in that, The first pushing mechanism includes a first cylinder, a first support assembly, a first hinge seat, and a first hinge shaft; the first support assembly consists of a first left-side L-shaped support and a first right-side L-shaped support that are detachably fixed to the machine base and cooperate to support the first cylinder; the piston rod of the first cylinder is hinged to the first adjustable leveling support platform by means of the first hinge seat and the first hinge shaft; as the piston rod of the first cylinder extends and retracts, its own yaw angle changes, and the tilt angle of the first adjustable leveling support platform changes accordingly.

5. The visual inspection system for fuel cell manifolds according to any one of claims 1-4, characterized in that, The first material picking and transfer device, the second material picking and transfer device, ..., the (n+1)th material picking and transfer device have the same design structure; the first material picking and transfer device includes a first bearing base, a first linear motion element, a first cantilever beam, and a first adsorption picking fixture; the first bearing base performs XY plane displacement motion under the driving force from the X-direction power unit and the Y-direction power unit; the first adsorption picking fixture is used to adsorb and pick up the fuel cell current collector plate, and it is supported by the first cantilever beam; the first linear motion element is used to drive the first cantilever beam together with the first adsorption picking fixture to perform Z-direction displacement motion, and it is mounted on the first bearing base.

6. The visual inspection system for fuel cell manifolds according to any one of claims 1-4, characterized in that, The first optical inspection device, the second optical inspection device, ..., the nth optical inspection device have the same design structure; the first optical inspection device is composed of a first upper AOI visual inspection module and a first lower AOI visual inspection module; the first upper AOI visual inspection module is used to pick up the front image of the fuel cell current collector, and it is located directly above the first visual inspection stage. The first lower AOI vision inspection module is used to pick up the back image of the fuel cell current collector. It is located directly below the first vision inspection stage and is hidden in the cavity of the machine.

Images