Visual inspection system for welding seam of collector plate of fuel cell

Abstract

The utility model relates to the technical field of visual inspection equipment manufacturing, in particular to a fuel cell collector plate weld visual inspection system. And the loading tool is used for loading the fuel cell collector plate and circulates among different stations under the action of the carrying force from the carrying unit. And when the loading tool is stopped at the visual detection station, the optical detection unit picks up welding seam images on the front surface and the back surface of the fuel cell collector plate. According to different specific working conditions, under the action of carrying force from the left linear driving device and the right linear driving device, the left movable conveyor and the right movable conveyor can be selectively aligned with the front fixed conveyor or the rear fixed conveyor, that is, the conveying line of the fuel cell collector plate is flexible, and the conveying efficiency of the fuel cell collector plate is improved. The method has multiple combination possibilities, and in practical application, ordered and efficient circulation of the fuel cell collector plates can be realized only by means of a relatively small number of carrying tools.

Description

TECHNICAL FIELD

[0001] The utility model relates to visual inspection equipment manufacturing technical field especially fuel cell current collector plate weld visual inspection system. BACKGROUND

[0002] Fuel cell as a kind of high-efficiency power generation device that does not burn fuel and directly converts the chemical energy of fuel into electrical energy by electrochemical reaction mode, has been widely valued and applied. Fuel cell current collector plate is an important component in fuel cell system, which plays a key role in concentrating, distributing and transmitting the electrical energy generated by fuel cell. Fuel cell current collector plate is a plate-shaped assembly made of conductive material, used to connect multiple single cells in fuel cell stack and provide power supply and current distribution function.

[0003] As shown in Figure 1 Fuel cell current collector plate is distributed with a large number of welds, and has extremely strict forming quality requirements. According to the functional classification of fuel cell current collector plate area, it is divided into flow channel area welding and sealing area welding, and the corresponding welding material is mostly metal, and the thickness of single material is controlled between 0.05-0.3mm, specifically: the weld surface should be smooth and flat, without obvious weld nodule, depression, porosity, crack and other defects; the weld should be smoothly transitioned with the base material, without obvious undercut, incomplete fusion, incomplete penetration and other defects; the shape and size of the weld should meet the design requirements, and should not exceed the allowable deviation; the weld surface should not have defects such as missed welding, miswelding, slag inclusion and other defects affecting use and appearance. In the prior art, the weld visual inspection equipment mainly consists of a machine table, a ring conveyor, a workpiece carrier tool, a turnover manipulator, an upstream visual inspection camera and a downstream visual inspection camera. The workpiece carrier tool is used to support single fuel cell current collector plate. A plurality of workpiece carrier tools are arranged on the ring conveyor, and the fuel cell current collector plate is subjected to upstream detection position under the conveying force from the ring conveyor. During this period, the upstream visual inspection camera picks up the complete front weld image of the fuel cell current collector plate, and then the turnover manipulator performs 180° turnover operation on the fuel cell current collector plate. Under the conveying force, it continues to flow and passes through the downstream detection position. During this period, the downstream visual inspection camera picks up the complete back weld image of the fuel cell current collector plate. During the unloading station, the fuel cell current collector plate is taken off from the workpiece carrier tool by means of a multi-degree-of-freedom manipulator, and the empty workpiece carrier tool continues to flow back to the loading station to welcome the fuel cell current collector plate to be detected. According to the feedback of upstream new energy automobile manufacturers, in actual application, the detection effect is poor, the detection efficiency is extremely low, and the weld defect is misdetected and missed. Therefore, the company recently developed a fuel cell current collector plate weld visual inspection equipment.

[0004] It is known that, for the old model of welding seam visual inspection equipment, the design goal of the annular conveying machine is achieved to realize the annular carrying of the carrying tool, the carrying tool is returned to the feeding station to continue to receive the fuel cell collector plate to be visually inspected, the required occupied area is large, which is not conducive to the optimization of workshop layout. And during the carrying of the carrying tool, the annular conveying machine needs to be kept in operation, the required energy consumption is large, which is not conducive to the realization of the design goal of energy saving and emission reduction. Furthermore, in the prior art, no fuel cell collector plate welding seam visual inspection system is found to be compatible with the design concept of the new model of fuel cell collector plate welding seam visual inspection equipment. Therefore, it is urgent for technical personnel to solve the above problems. Practical new type content

[0005] Therefore, the designers of the present application, in view of the above-mentioned problems and defects, collected relevant data, evaluated and considered from all aspects, and through years of research and development experience of technical personnel in this industry, continuous experiments and modifications, finally led to the emergence of the fuel cell collector plate welding seam visual inspection system.

[0006] In order to solve the above technical problems, the present application relates to a fuel cell collector plate welding seam visual inspection system, which belongs to a fuel cell collector plate welding seam visual inspection equipment, comprising a machine table, a carrying tool, a carrying unit and an optical detection unit. The carrying unit and the optical detection unit are both borne by the machine table. The carrying tool is used to carry the fuel cell collector plate, and under the action of the carrying force from the carrying unit, it flows between different stations. During the stopping of the carrying tool at the visual inspection station, the optical detection unit picks up the front and back welding seam images of the fuel cell collector plate. The carrying unit includes a left-moving conveyor, a left-linear drive device, a front-fixed conveyor, a right-moving conveyor, a right-linear drive device and a rear-fixed conveyor. Under the action of the carrying force from the left-linear drive device, the left-moving conveyor performs displacement movement along the front-back direction, and it can selectively dock with the front-fixed conveyor or the rear-fixed conveyor. Under the action of the carrying force from the right-linear drive device, the right-moving conveyor performs displacement movement along the front-back direction, and it can selectively dock with the front-fixed conveyor or the rear-fixed conveyor. And the left-moving conveyor, the front-fixed conveyor and the right-moving conveyor are combined to form a linear conveying line, and the full-load carrying tool can be transferred from the feeding station to the discharging station under the action of the carrying force, and during the transfer, it passes through the visual inspection station.

[0007] As a further improvement of the technical scheme disclosed by the present application, the left-moving conveyor, the front-fixed conveyor, the right-moving conveyor and the rear-fixed conveyor are all belt conveyors, and the working surfaces are kept at the same position height.

[0008] As a further improvement of the disclosed technical scheme of the utility model, the left linear drive device and the right linear drive device are selected from any one of the screw drive linear module, the synchronous belt drive linear module and the rack and pinion drive linear module.

[0009] As a further improvement of the disclosed technical scheme of the utility model, the object carrier simultaneously carries N fuel cell current collector plates. The object carrier is divided into N carrying sub-zones. The optical detection unit comprises a first optical detection device, a second optical detection device,..., and an Nth optical detection device. During the stop of the object carrier at the visual detection station, the first optical detection device, the second optical detection device,..., and the Nth optical detection device correspondingly pick up the front and back weld images of the fuel cell current collector plates opposite thereto.

[0010] As a further improvement of the disclosed technical scheme of the utility model, the first optical detection device, the second optical detection device,..., and the Nth optical detection device have the same design structure. The first optical detection device comprises a first upper AOI visual detection module and a first lower AOI visual detection module. The first upper AOI visual detection module is used to pick up the front weld images of the fuel cell current collector plates and is located directly above the front fixed conveyor. The first lower AOI visual detection module is used to pick up the back weld images of the fuel cell current collector plates and is hidden directly below the front fixed conveyor.

[0011] As a further improvement of the disclosed technical scheme of the utility model, an upper process notch is arranged in each carrying sub-zone to facilitate the optical detection unit to pick up the back weld images of the fuel cell current collector plates.

[0012] As a further improvement of the disclosed technical scheme of the utility model, the fuel cell current collector plate weld visual detection system further comprises a visual detection position reference template and a jacking unit. The visual detection position reference template spans the front fixed conveyor and is installed based on the front and rear conveying beams of the front fixed conveyor. When the object carrier is transferred to the visual detection station, it approaches and interacts with the visual detection position reference template due to the jacking force from the jacking unit, and in this process, the object carrier is guided to be aligned with the optical detection unit due to the alignment guiding force from the visual detection position reference template.

[0013] As a further improvement of the disclosed technical scheme of the utility model, a limiting assembly is arranged on the object carrier. The limiting assembly comprises a plurality of limiting pins fixed to the top wall of the object carrier in a detachable manner. The visual detection position reference template is formed with a plurality of limiting pin holes matched with the limiting pins.

[0014] As further improvement of the disclosed technical scheme in the utility model, the jacking unit is combined by the front jacking subunit and the rear jacking subunit. The front jacking subunit and the rear jacking subunit take the front and rear conveying beams of the front fixed conveyor as the installation base respectively, and the two are coordinated to apply the jacking force to the load tool.

[0015] As further improvement of the disclosed technical scheme in the utility model, the front jacking subunit and the rear jacking subunit have the same design structure. The front jacking subunit comprises the front sliding table cylinder and the front jacking plate. In the synchronous motion process of the front jacking plate following the sliding table of the front sliding table cylinder, the load tool performs the lifting motion due to the jacking force from the front jacking plate.

[0016] The working principle of the fuel cell collecting plate welding seam visual detection system disclosed in the utility model is as follows: in the initial working condition, the left mobile conveyor and the right mobile conveyor are kept in alignment with the front fixed conveyor to form a linear conveying line. The fuel cell collecting plate is supported by the load tool and transferred to the front fixed conveyor through the left mobile conveyor, and during the stop at the visual detection station, the front and back welding seam images of the fuel cell collecting plate are picked up by the optical detection unit, then the load tool continues to transfer to the right mobile conveyor and stops at the unloading station, and then the fuel cell collecting plate that has undergone visual detection is picked up from the load tool by the multi-degree-of-freedom manipulator and transferred to the next process; then the right mobile conveyor performs the rear movement due to the driving force from the right linear drive device until it is kept in alignment with the rear fixed conveyor, and during this period, the empty load tool performs the following rear movement; then the empty load tool is transferred from the right mobile conveyor to the rear fixed conveyor under the carrying force from the right mobile conveyor; at the same time, the left mobile conveyor performs the rear movement due to the driving force from the left linear drive device until it is kept in alignment with the rear fixed conveyor; then the empty load tool is transferred from the rear fixed conveyor to the left mobile conveyor under the carrying force from the rear fixed conveyor; then the left mobile conveyor performs the front movement due to the reverse driving force from the left linear drive device until it is kept in alignment with the front fixed conveyor again, at this moment, the empty load tool can be returned to the loading station again to welcome the subsequent fuel cell collecting plate to be visually detected. The above-mentioned action process is continuously circulated, and the batch fuel cell collecting plates can be visually detected one by one.

[0017] By adopting the technical scheme, according to different specific working conditions, the left mobile conveyor and the right mobile conveyor can be selectively aligned with the front fixed conveyor or the rear fixed conveyor, that is, the fuel cell current collector plate conveying line is flexible and has multiple combination possibilities, in actual application, only a relatively small number of carrying tools are needed to realize the ordering and efficient flow of the fuel cell current collector plate; moreover, under the premise that the carrying tool annular circulation flow design purpose is realized, the carrying unit has a very simple design structure and very low implementation cost. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0019] Figure 1 is a perspective view of the fuel cell current collector plate disclosed by the present application.

[0020] Figure 2 is a perspective view of the fuel cell current collector plate weld visual inspection equipment disclosed by the present application.

[0021] Figure 3 is also a perspective view of the fuel cell current collector plate weld visual inspection equipment disclosed by the present application (hidden left multi-degree-of-freedom pickup manipulator, right multi-degree-of-freedom pickup manipulator and bearing frame state).

[0022] Figure 4 is a perspective view of the fuel cell current collector plate weld visual inspection system disclosed by the present application.

[0023] Figure 5 is a perspective view of the fuel cell current collector plate weld visual inspection system disclosed by the present application (hidden in the optical detection unit state).

[0024] Figure 6 is a perspective view of the carrying tool in the fuel cell current collector plate weld visual inspection system disclosed by the present application.

[0025] Figure 7 is Figure 6 a top view (the first carrying partition, the second carrying partition and the third carrying partition are defined by double-dot dashed lines).

[0026] Figure 8 is a perspective view of the carrying unit in the fuel cell current collector plate weld visual inspection system disclosed by the present application.

[0027] Figure 9 is a top view of Figure 8 .

[0028] Figure 10 is a perspective view of the optical detection unit in the fuel cell current collector plate welding seam visual detection system disclosed by the utility model.

[0029] Figure 11 is a front view of Figure 10 .

[0030] Figure 12 is a position relation schematic view of the load tool carried by the front fixed conveyor in the fuel cell current collector plate welding seam visual detection system disclosed by the utility model relative to the visual detection position reference template from a kind of visual angle at a moment.

[0031] Figure 13 is a position relation schematic view of the load tool carried by the front fixed conveyor in the fuel cell current collector plate welding seam visual detection system disclosed by the utility model relative to the visual detection position reference template from another kind of visual angle at a moment.

[0032] Figure 14 is a front view of Figure 12 .

[0033] Figure 15 is A-A sectional view of Figure 14 .

[0034] 1-machine table;2-load tool;21-first bearing subarea;211-first upper process notch;22-second bearing subarea;221-second upper process notch;23-third bearing subarea;231-third upper process notch;24-limiting assembly;241-limiting pin;3-carrying unit;31-left mobile conveyor;32-left linear drive device;33-front fixed conveyor;34-right mobile conveyor;35-right linear drive device;36-rear fixed conveyor;4-optical detection unit;41-first optical detection device;411-first upper AOI visual detection module;412-first lower AOI visual detection module;42-second optical detection device;43-third optical detection device;5-visual detection position reference template;51-limiting pin hole;6-jacking unit;61-front jacking subunit;611-front sliding table air cylinder;612-front jacking plate;62-rear jacking subunit. DETAILED DESCRIPTION

[0035] 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.

[0036] The present invention will be further described in detail below with reference to specific embodiments. Figure 2 , Figure 3 The diagrams show two different states of the visual inspection equipment for fuel cell manifolds disclosed in this utility model. It can be seen that its main structure is a visual inspection system for weld seams of fuel cell manifolds, which is used to capture images of the formed weld seams on the fuel cell manifolds.

[0037] Figure 4 , Figure 5 The diagrams show two different states of the visual inspection system for fuel cell current collector welds disclosed in this invention. It can be seen that the system mainly consists of a machine base 1, a carrying fixture 2, a transport unit 3, and an optical inspection unit 4. Both the transport unit 3 and the optical inspection unit 4 are supported by the machine base 1. The carrying fixture 2 carries the fuel cell current collector and moves between different workstations under the transport force from the transport unit 3. While the carrying fixture 2 is stationed at the visual inspection station, the optical inspection unit 4 captures images of the front and back welds of the fuel cell current collector.

[0038] Depend on Figure 8 , 9 As clearly shown, the transport unit 3 mainly consists of a left-side mobile conveyor 31, a left-side linear drive unit 32, a front-side fixed conveyor 33, a right-side mobile conveyor 34, a right-side linear drive unit 35, and a rear-side fixed conveyor 36. In practical applications, under the carrying force from the left-side linear drive unit 32, the left-side mobile conveyor 31 performs displacement movement in the front-to-back direction, selectively engaging with either the front-side fixed conveyor 33 or the rear-side fixed conveyor 36. Under the carrying force from the right-side linear drive unit 35, the right-side mobile conveyor 34 performs displacement movement in the front-to-back direction, selectively engaging with either the front-side fixed conveyor 33 or the rear-side fixed conveyor 36. Furthermore, the left-side mobile conveyor 31, the front-side fixed conveyor 33, and the right-side mobile conveyor 34 are combined to form a linear conveyor line. The fully loaded loading fixture can be transferred from the loading station to the unloading station under the action of the carrying force, and it passes through the visual inspection station during the process.

[0039] In actual application, under initial working condition, the left mobile conveyor 31 and the right mobile conveyor 34 are kept in alignment with the front fixed conveyor 33 to form a linear conveying line. The fuel cell current collector plate is supported by the carrier tool 2 and transferred to the front fixed conveyor 33 through the left mobile conveyor 31. During the stopping of the fuel cell current collector plate at the visual inspection station, the front and back surface weld images of the fuel cell current collector plate are picked up by the optical inspection unit 4. Then, the carrier tool 2 continues to be transferred to the right mobile conveyor 34 and stops at the unloading station. Subsequently, the fuel cell current collector plate that has undergone visual inspection is picked up from the carrier tool 2 by the multi-degree-of-freedom mechanical hand and transferred to the next process. Then, the right mobile conveyor 34 performs backward movement under the driving force from the right linear drive device 35 until it is kept in alignment with the rear fixed conveyor 36, and during this period, the carrier tool 2 performs following backward movement. Subsequently, the carrier tool 2 is transferred from the right mobile conveyor 34 to the rear fixed conveyor 36 under the carrying force from the right mobile conveyor 34. At the same time, the left mobile conveyor 31 performs backward movement under the driving force from the left linear drive device 32 until it is kept in alignment with the rear fixed conveyor 36. Then, the carrier tool 2 is transferred from the rear fixed conveyor 36 to the left mobile conveyor 31 under the carrying force from the rear fixed conveyor 36. Subsequently, the left mobile conveyor 31 performs forward movement under the reverse driving force from the left linear drive device 32 until it is kept in alignment with the front fixed conveyor 33 again. At this moment, the carrier tool 2 is returned to the loading station again to receive the subsequent fuel cell current collector plate to be inspected. The above-mentioned action process is continuously cycled, and the batch fuel cell current collector plates are sequentially subjected to visual inspection.

[0040] By adopting the above technical scheme, the left mobile conveyor 31 and the right mobile conveyor 34 can perform position transformation movement in the front-back direction. According to different specific working conditions, the left mobile conveyor 31 and the right mobile conveyor 34 can be selectively kept in alignment with the front fixed conveyor 33 or the rear fixed conveyor 36, that is, the conveying line of the fuel cell current collector plate is flexible and has multiple combination possibilities. In actual application, only a relatively small number of carrier tools 2 are needed to realize the orderly and efficient transfer of the fuel cell current collector plate. Furthermore, under the premise that the circular circulation transfer design purpose of the carrier tool 2 is achieved, the carrier unit 3 has a very simple design structure and very low implementation cost.

[0041] As further optimization of the above technical solutions, the left mobile conveyor 31, the front fixed conveyor 33, the right mobile conveyor 34 and the rear fixed conveyor 36 are preferably belt conveyors, and the working surfaces are kept at the same position height. In this way, on the one hand, the belt conveyor has strong conveying capacity, and can be conveniently and quickly modified or rearranged according to the specific specifications and sizes of the load tool 2; the structure of the belt conveyor is relatively simple, the reliability of each component is high, easy to maintain daily, and the purchase cost is relatively low; on the other hand, the load tool 2 maintains good posture stability during the carrying process.

[0042] It is known that according to common knowledge, various methods can be adopted to realize the overall position transformation of the left mobile conveyor 31 and the right mobile conveyor 34, but here a design structure is recommended, which is simple, easy to implement, quick in action response, and relatively high in action accuracy, and the specific implementation scheme is as follows: Figure 8 、 9 As shown in FIGS. 6,

[0043] For the purpose of considering both improving the flow efficiency of the fuel cell current collector plate and improving the image acquisition efficiency of the optical detection unit 4, as further optimization of the above technical solutions, as shown in FIGS. 6, Figure 4 、 5 , the load tool 2 carries 3 fuel cell current collector plates at the same time, which are artificially divided into the first carrying sub-area 21, the second carrying sub-area 22 and the third carrying sub-area 23 which are adapted to the outer dimensions of the fuel cell current collector plate. As shown in FIGS. 6, Figure 10 、 11 The optical detection unit 4 includes the first optical detection device 41, the second optical detection device 42 and the third optical detection device 43. During the period when the load tool 2 is carried by the front fixed conveyor 33 and stops at the visual detection station, the first optical detection device 41, the second optical detection device 42 and the third optical detection device 43 correspondingly pick up the front and back weld images of the fuel cell current collector plate opposite to them.

[0044] Furthermore, as shown in FIGS. 6, Figure 10 、 11As can be clearly seen in the diagram, the first optical inspection device 41, the second optical inspection device 42, and the third optical inspection device 43 have the same design structure. For the sake of brevity, only the first optical inspection device 41 will be described here as an example, which 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 capture the front weld image of the fuel cell manifold, and it is located directly above the front fixed conveyor 33. The first lower AOI visual inspection module 412 is used to capture the back weld image of the fuel cell manifold, and it is hidden directly below the front fixed conveyor 33. Figure 6 , 7 As can also be clearly seen in the diagram, a first upper process notch 211 is provided in the first bearing partition 21 area to facilitate the first lower AOI vision inspection module 412 in picking up the image of the weld seam on the back of the fuel cell current collector. In order to accommodate the second optical inspection device 42 and the third optical inspection device 43, analogous to the first bearing partition 21, a second upper process notch 221 and a third upper process notch 231 are respectively provided in the second bearing partition 22 and the third bearing partition 23 areas.

[0045] Furthermore, by Figure 4 , 5 As can be clearly seen in the diagram, the visual inspection system for the fuel cell manifold weld also includes a visual inspection reference template 5 and a lifting unit 6. The visual inspection reference template 5 spans the front fixed conveyor 33, and its installation base is the front and rear conveyor beams of the front fixed conveyor 33. When the loading fixture 2 is transferred to the visual inspection station, it approaches and interacts with the visual inspection reference template 5 due to the lifting force from the lifting unit 6. During this process, the loading fixture 2 achieves precise alignment with the optical inspection unit 4 due to the alignment and guiding force from the visual inspection reference template 5.

[0046] As a further refinement of the above technical solution, such as Figure 6 , 7As shown in the figure, the load carrier 2 is provided with a limiting assembly 24. The limiting assembly 24 is composed of a plurality of limiting pins 241 fixed to the top wall of the load carrier 2 in a detachable manner. The visual detection position reference template 5 is formed with a plurality of limiting pin holes 51 matched with the limiting pins 241. Preferably, the limiting pins 241 and the limiting pin holes 51 are in loose fit H8 / h7, considering the actual application effect and manufacturing difficulty. When the load carrier 2 approaches the visual detection position reference template 5 under the jacking force from the jacking unit 6, each limiting pin 241 is inserted into the corresponding limiting pin hole 51, and in this process, the load carrier 2 is precisely positioned with the optical detection unit 4 under the coordinated and guiding force from the plurality of limiting pin holes 51.

[0047] As shown in the figure, Figures 12-15 As shown in the figure, the jacking unit 6 is composed of a front jacking sub-unit 61 and a rear jacking sub-unit 62. The front jacking sub-unit 61 and the rear jacking sub-unit 62 are respectively installed on the front and rear conveying beams of the front fixed conveyor 33, and cooperatively apply a jacking force to the load carrier 2.

[0048] As shown in the figure, Figures 12-15 As shown in the figure, the front jacking sub-unit 61 and the rear jacking sub-unit 62 have the same design structure. Taking the front jacking sub-unit 61 as an example, it includes a front sliding table cylinder 611 and a front jacking plate 612. In the synchronous movement process of the front jacking plate 612 following the sliding table of the front sliding table cylinder 611, the load carrier 2 performs lifting movement under the jacking force from the front jacking plate 612.

[0049] The above description of disclosed embodiments enables those skilled in the art to carry out or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fuel cell current collector plate welding seam visual inspection system, belonging to a fuel cell current collector plate welding seam visual inspection apparatus, comprising a machine table, a workpiece carrier, a carrying unit and an optical inspection unit; the carrying unit and the optical inspection unit are both borne by the machine table; the workpiece carrier is used to carry a fuel cell current collector plate and is transferred between different stations under the carrying force from the carrying unit; during the stop of the workpiece carrier at a visual inspection station, the optical inspection unit picks up the front and back welding seam images of the fuel cell current collector plate, characterized in that, The carrying unit comprises a left-positioned movable conveyor, a left-positioned linear drive device, a front-positioned fixed conveyor, a right-positioned movable conveyor, a right-positioned linear drive device and a rear-positioned fixed conveyor; Under the action of the carrying force from the left-positioned linear drive device, the left-positioned movable conveyor performs displacement movement along the front-rear direction, and is selectively docked with the front-positioned fixed conveyor or the rear-positioned fixed conveyor; Under the action of the carrying force from the right-positioned linear drive device, the right-positioned movable conveyor performs displacement movement along the front-rear direction, and is selectively docked with the front-positioned fixed conveyor or the rear-positioned fixed conveyor; The left-positioned movable conveyor, the front-positioned fixed conveyor and the right-positioned movable conveyor are combined to form a linear conveying line, and the full-load carrying tool is transferred from the feeding station to the discharging station under the action of the carrying force, and experiences the visual detection station during the transfer.

2. The fuel cell current collector weld seam vision inspection system of claim 1, wherein, The left-positioned movable conveyor, the front-positioned fixed conveyor, the right-positioned movable conveyor and the rear-positioned fixed conveyor are all belt conveyors, and the working surfaces are kept at the same position height.

3. The fuel cell current collector weld seam vision inspection system of claim 1, wherein, The left-positioned linear drive device and the right-positioned linear drive device are selected from any one of a screw drive linear module, a synchronous belt drive linear module and a rack and pinion drive linear module.

4. The fuel cell current collector weld seam vision inspection system of any of claims 1-3, wherein, The carrying tool simultaneously carries N fuel cell current collectors; the carrying tool is divided into N carrying sub-zones; the optical detection unit comprises a first optical detection device, a second optical detection device,..., and an Nth optical detection device; During the stopping of the carrying tool at the visual detection station, the first optical detection device, the second optical detection device,..., and the Nth optical detection device one-by-one correspondingly perform weld image picking of the front and back surfaces of the fuel cell current collectors opposite thereto.

5. The fuel cell current collector weld seam vision inspection system of claim 4, wherein, The first optical detection device, the second optical detection device,..., and the Nth optical detection device have the same design structure; the first optical detection device comprises a first upper AOI visual detection module and a first lower AOI visual detection module; the first upper AOI visual detection module is used to pick the front weld image of the fuel cell current collector, and is located directly above the front-positioned fixed conveyor; The first lower AOI visual detection module is used to pick the back weld image of the fuel cell current collector, and is hidden directly below the front-positioned fixed conveyor.

6. The fuel cell current collector weld seam vision inspection system of claim 5, wherein, An upper process gap is formed in each of the carrying sub-zones to facilitate the optical detection unit to pick the back weld image of the fuel cell current collector.

7. The fuel cell current collector weld seam vision inspection system of any of claims 1-3, wherein, A visual detection position reference template and a jacking unit are further included; the visual detection position reference template spans the front-positioned fixed conveyor, and the front and rear conveying beams of the front-positioned fixed conveyor are used as the installation basis. When the carrier tool is transferred to the visual inspection station, it approaches and interacts with the visual inspection station reference template due to the jacking force from the jacking unit, and in this process, the carrier tool is precisely aligned with the optical inspection unit due to the positive guiding force from the visual inspection station reference template.

8. The fuel cell current collector weld seam vision inspection system of claim 7, wherein, The carrier tool is provided with a limiting assembly, which is composed of multiple limiting pins fixed to the top wall of the carrier tool in a detachable manner; the visual inspection station reference template is formed with multiple limiting pin holes matched with the limiting pins.

9. The fuel cell current collector weld seam visual inspection system of claim 7, wherein, The jacking unit is composed of a front jacking subunit and a rear jacking subunit; the front jacking subunit and the rear jacking subunit take the front and rear conveying beams of the front fixed conveyor as the installation base, and both of them cooperatively apply a jacking force to the carrier tool.

10. The fuel cell current collector weld seam vision inspection system of claim 9, wherein, The front jacking subunit and the rear jacking subunit have the same design structure; the front jacking subunit includes a front sliding table cylinder and a front jacking plate; in the synchronous motion process of the front jacking plate following the sliding table of the front sliding table cylinder, the carrier tool performs lifting motion due to the jacking force from the front jacking plate.

Images