Double-station high-speed laser welding machine for metal bipolar plate

Abstract

The invention belongs to the technical field of welding, and provides a metal bipolar plate double-station high-speed laser welding machine which comprises a base, the base is fixedly connected to the ground, a fence assembly is arranged around the base, a movable guide rail is fixedly connected to one side of the top face of the base, and two three-axis positioning devices are slidably connected to the movable guide rail. Welding devices are fixedly connected to the two three-axis positioning devices respectively, two welding clamps are fixedly connected to the side, away from the movable guide rail, of the top face of the base, and a control system is further fixedly connected to the base. According to the invention, the double laser welding stations are used for welding two groups of bipolar plates at the same time, and a high-speed scanning galvanometer and an automatic welding clamp are used, so that the production efficiency and the welding quality are greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of welding, and in particular relates to a metal bipolar plate double-station high-speed laser welding machine. Background Art

[0002] The metal bipolar plate is the core framework of the "fuel cell stack", the power heart of hydrogen energy vehicles. In its production and manufacturing process, the laser welding quality of the metal bipolar plate has an important impact on the stack power and cost control of the final finished hydrogen battery. The thickness of the single-piece material of the metal bipolar plate is distributed between 0.05 mm and 0.3 mm, and the average welding thickness is 0.15 mm, which is thinner than two A4 printing papers. As an intermediate carrier for hydrogen storage and electrical conversion, the welding of bipolar plates needs to consider various factors such as sealing, firmness, consistency, durability, and flatness. The welding requirements are extremely strict, and its output is also one of the bottlenecks restricting the industrialization of hydrogen fuel cells.

[0003] In the prior art, generally, the welding of metal bipolar plates is gradually completed in multiple single stations, resulting in high equipment, floor space, and personnel costs. In addition, the existing welding equipment only includes a single laser welding device, and the integration of the post-welding marking process is insufficient, resulting in a reduction in the overall efficiency of the production line due to the transfer process between multiple stations, and thus the efficiency of welding metal bipolar plates is low. Summary of the Invention

[0004] The purpose of the present invention is to provide a metal bipolar plate double-station high-speed laser welding machine to solve the above problems. The present invention can simultaneously weld two groups of bipolar plates through two laser welding stations coordinated by a control system, which can greatly improve production efficiency. At the same time, the whole process is controlled by a computer, and the quality is stable. During the welding process, welding dust can be cleaned in real time, and the protective gas atmosphere in the welding area can be maintained to prevent the oxidation of the weld. At the same time, after welding, the welding dust can be blown away, which can effectively extend the service life of the fixture and reduce the equipment maintenance time.

[0005] To achieve the above object, the present invention provides the following solution: including a base, the base is fixedly connected to the ground, a fence assembly is arranged around the base, a moving guide rail is fixedly connected to one side of the top surface of the base, two three-axis positioning devices are slidably connected to the moving guide rail, welding devices are respectively fixedly connected to the two three-axis positioning devices, two welding jigs are fixedly connected to the side of the top surface of the base far from the moving guide rail, two welding baffles are arranged on the welding jigs, welding passages and marking passages are formed in the two welding baffles (51), and a control system is also fixedly connected to the base.

[0006] Preferably, the three-axis positioning device includes a laser welding cantilever. One end of the laser welding cantilever is in sliding contact with the top surface of the moving guide rail through a lateral moving member. A longitudinal moving member is fixedly connected to the side wall of the laser welding cantilever. A connecting member is in sliding contact with the longitudinal moving member. A vertical moving member is fixedly connected to the side wall of the connecting member.

[0007] Preferably, the welding device includes an ultrafast laser fixedly connected to the side of the laser welding cantilever away from the longitudinal moving member. A scanning galvanometer is slidably connected to the side wall of the vertical moving member. The ultrafast laser and the scanning galvanometer are connected by an optical fiber.

[0008] Preferably, the welding fixture includes a fixture base fixedly connected to the top surface of the base. A moving shaft is fixedly connected to the top surface of the fixture base. A clamping tray is slidably connected to the moving shaft. Two dust removal components are also fixedly connected to the top surface of the fixture base.

[0009] Preferably, the dust removal component includes two welding baffles. The two welding baffles are fixedly connected to the top surface of the fixture base by fixing rods. Three mounting brackets are also fixedly connected to the top surface of the fixture base. The three mounting brackets and the two welding baffles are arranged alternately. Welding vacuum cleaners are fixedly connected to the side walls of two of the mounting brackets close to one side of the two welding baffles. Gas protection nozzles are fixedly connected to the side walls of two of the mounting brackets close to the other side of the two welding baffles. Cleaning nozzles are also fixedly connected to the opposite side walls of the mounting bracket located between the two welding baffles.

[0010] Preferably, the fence component includes a fence. The base is arranged inside the fence cavity. An observation window and a door are arranged on the side wall of the fence.

[0011] Preferably, moving components are arranged at the connection between the lateral moving member and the moving guide rail, the connection between the connecting member and the longitudinal moving member, the connection between the scanning galvanometer and the vertical moving member, and the connection between the moving shaft and the fixture base.

[0012] Compared with the prior art, the present invention has the following advantages and technical effects:

[0013] 1. In the present invention, two sets of bipolar plates are welded simultaneously at the double laser welding stations. The high-speed scanning galvanometer can cooperate with the welded parts clamped by the welding fixture to move between the two stations, so that the workpieces to be welded clamped by the welding fixture can be welded at both stations. At the same time, the welded parts can realize welding and marking respectively at the two welding stations.

[0014] 2. The welding fixture of the present invention integrates a welding dust collector, a cleaning nozzle, and a shielding gas nozzle, which can clean welding dust in real time during the welding process, maintain the shielding gas atmosphere in the welding area, prevent the oxidation of the weld, ensure the smooth surface of the bipolar plate. At the same time, the cleaning nozzle blows away the welding dust after the scanning path of a welding baffle is completed, which can effectively extend the service life of the fixture and reduce the equipment maintenance time. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings:

[0016] Figure 1 It is a schematic structural diagram of a metal bipolar plate double-station high-speed laser welding machine of the present invention;

[0017] Figure 2 It is a schematic structural diagram of the three-axis positioning device in the present invention;

[0018] Figure 3 It is a schematic structural diagram of the welding fixture in the present invention;

[0019] Among them, 1. Base; 2. Laser welding cantilever; 21. Ultrafast laser; 22. Scanning galvanometer; 23. Three-axis positioning device; 231. Lateral moving member; 232. Longitudinal moving member; 233. Vertical moving member; 3. Moving guide rail; 4. Control system; 5. Fixture base; 51. Welding baffle; 52. Welding dust collector; 53. Cleaning nozzle; 54. Shielding gas nozzle; 55. Clamping tray; 6. Fence; 61. Observation window; 62. Entrance and exit door. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0021] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0022] Refer to Figures 1 - 3As shown in the figure, the present invention provides a metal bipolar plate double-station high-speed laser welding machine, including: a base 1, the base 1 is fixedly connected to the ground, a fence assembly is arranged around the base 1, a moving guide rail 3 is fixedly connected to one side of the top surface of the base 1, and two three-axis positioning devices 23 are slidably connected to the moving guide rail 3. Welding devices are respectively fixedly connected to the two three-axis positioning devices 23. Two welding jigs are fixedly connected to the side of the top surface of the base 1 away from the moving guide rail 3. Two welding baffles 51 are arranged on the welding jigs. Two welding passages and a marking passage are opened on the two welding baffles 51. A control system 4 is also fixedly connected to the base 1.

[0023] The arranged fence assembly forms a welding chamber for enclosing the high-speed laser welding machine in its inner cavity. The moving guide rail 3 arranged on the base 1 cooperates with the two groups of three-axis positioning devices 23 to realize the three-way movement of the two groups of welding devices, and the moving direction and moving distance can be controlled by the control system 4. The two groups of welding jigs arranged can simultaneously clamp the two groups of metal bipolar plates, and cooperate with the two welding baffles 51 in the movable welding device. A first welding passage is opened on the top surface of one welding baffle 51, and a second welding passage and a marking passage are opened on the top surface of the other welding baffle 51, realizing the welding and marking of the two groups of metal bipolar plates to be welded, and improving the production efficiency of the bipolar plates.

[0024] In a further optimized solution, the three-axis positioning device 23 includes a laser welding cantilever 2. One end of the laser welding cantilever 2 is in sliding contact with the top surface of the moving guide rail 3 through a lateral moving member 231. A longitudinal moving member 232 is fixedly connected to the side wall of the laser welding cantilever 2. A connecting member is in sliding contact with the longitudinal moving member 232, and a vertical moving member 233 is fixedly connected to the side wall of the connecting member.

[0025] The laser welding cantilever 2 is arranged to be able to slide on the top surface of the moving slide rail through the lateral moving member 231. The arranged longitudinal moving member 232 is fixedly connected to the side of the laser welding cantilever 2. At the same time, the arranged connecting member can slide arbitrarily on the longitudinal moving member 232. A scanning galvanometer 22 is fixedly connected to the vertical moving member 233 arranged on the side wall of the connecting member, and the scanning galvanometer 22 can slide along the vertical axis. The above settings realize that the scanning galvanometer 22 can move arbitrarily in three directions.

[0026] In a further optimized solution, the welding device includes an ultrafast laser 21 fixedly connected to the side of the laser welding cantilever 2 away from the longitudinal moving member 232. A scanning galvanometer 22 is slidably connected to the side wall of the vertical moving member 233. The ultrafast laser 21 and the scanning galvanometer 22 are connected by an optical fiber.

[0027] The arranged ultrafast laser 21 and the arranged scanning galvanometer 22 can be replaced according to different welding processes or different welding materials. The laser emitted by the ultrafast laser 21 can be conducted along the optical fiber to the scanning galvanometer 22 for emission.

[0028] For a further optimized solution, the welding fixture includes a fixture base 5, the fixture base 5 is fixedly connected to the top surface of the base 1, a moving shaft is fixedly connected to the top surface of the fixture base 5, a clamping tray 55 is slidably connected to the moving shaft, and two dust removal components are also fixedly connected to the top surface of the fixture base 5.

[0029] The provided fixture base 5 provides a position for the installation of the moving shaft. At the same time, the provided clamping tray 55 can move along the axial direction of the moving shaft. The metal bipolar plate to be welded can be clamped on the clamping tray 55 and driven to move on the moving shaft. Two sets of welding positions are provided on each fixture base 5, and a dust removal component is provided for each set of welding positions.

[0030] For a further optimized solution, the dust removal component includes two welding baffles 51. The two welding baffles 51 are fixedly connected to the top surface of the fixture base 5 through a fixing rod (not shown in the figure). Three mounting brackets are also fixedly connected to the top surface of the fixture base 5. The three mounting brackets and the two welding baffles 51 are arranged alternately. Among them, welding dust collectors 52 are fixedly connected to the side walls of two mounting brackets close to one side of the two welding baffles 51, protective gas nozzles 54 are fixedly connected to the side walls of two mounting brackets close to the other side of the two welding baffles 51, and cleaning nozzles 53 are fixedly connected to the opposite side walls of the mounting bracket located between the two welding baffles 51.

[0031] The welding baffles 51 provided on the dust removal component can block the molten metal splashed in the welding molten pool during welding. The three provided mounting brackets provide installation positions for the welding dust collectors 52, the protective gas nozzles 54, and the cleaning nozzles 53. When the three-axis positioning device 23 drives the scanning galvanometer 22 to weld the metal bipolar plate, the protective gas nozzles 54 can spray protective gas in the welding area to avoid oxidation at the welding point. The welding dust collectors 52 can suck out the soot generated during welding, and the provided cleaning nozzles 53 can blow away the welding dust after welding, effectively prolonging the service life of the fixture and reducing the equipment maintenance time.

[0032] For a further optimized solution, the fence component includes a fence 6. The base 1 is arranged inside the cavity of the fence 6. An observation window 61 and a door 62 are arranged on the side wall of the fence 6.

[0033] The provided fence 6 can prevent personnel from mistakenly entering the equipment operation range and avoid accidents. The provided observation window 61 can observe the internal welding situation, and the provided door 62 provides a passage for personnel to enter and exit.

[0034] For a further optimized solution, moving components (not shown in the figure) are provided at the connection between the lateral moving member 231 and the moving guide rail 3, at the connection between the connecting member and the longitudinal moving member 232, at the connection between the scanning galvanometer 22 and the vertical moving member 233, and at the connection between the moving shaft and the fixture base 5.

[0035] The provided moving component (not shown in the figure) belongs to the prior art, and its specific structure will not be elaborated here one by one. The provided moving component can drive the laser welding cantilever 2 to move on the moving guide rail 3 through the lateral moving member 231, can drive the connecting member to move on the longitudinal moving member 232, drive the scanning galvanometer 22 to move on the vertical moving member 233, and drive the fixture base 5 to move on the moving shaft.

[0036] In a further optimized solution, the control system 4 is signal-connected to the moving component, the welding dust collector 52, the ultrafast laser 21, the cleaning nozzle 53, and the protective gas nozzle 54 through signal lines.

[0037] Since the welding processes of the two laser welding stations are the same, the working principle of only one welding station will be described here: First, place the metal bipolar plate to be welded on the clamping tray 55 of the welding fixture by a manipulator or manually. Then, according to the preset program, the control system 4 controls the three-axis positioning device 23 of the two laser welding cantilevers 2 to move the scanning galvanometer 22 to the welding area of the first welding baffle 51, while controlling the welding fixture to move the clamping tray 55 under the first welding baffle 51. Subsequently, the welding dust collector 52 and the protective gas nozzle 54 are started, and at the same time, the three-axis positioning device 23 drives the scanning galvanometer 22 to complete the welding path of this area one by one; when the welding path of one welding baffle 51 is completed, the control system 4 quickly controls the clamping tray 55 to move the bipolar plate to be welded to the next welding baffle 51 position, and starts the cleaning nozzle 53 to clean the first welding baffle 51. At the same time, the three-axis positioning device 23 will move the scanning galvanometer 22 to the welding position of the next welding baffle 51, and repeat the welding and cleaning processes of the first welding baffle 51. When all the welding paths of the bipolar plate are completed, the control system 4 controls the tray of the welding fixture and the welding cantilever to return to the initial position to prepare for the next welding. During the working process of the welding machine, the control system 4 simultaneously controls and coordinates the two welding stations to perform the above welding process. The two stations can maintain the same rhythm or work asynchronously.

[0038] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0039] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A metal bipolar plate double-station high-speed laser welding machine, characterized in that, Including: A base (1) fixedly connected to the ground, a fence assembly is arranged around the base (1), a moving guide rail (3) is fixedly connected to one side of the top surface of the base (1), two three-axis positioning devices (23) are slidably connected to the moving guide rail (3), welding devices are respectively fixedly connected to the two three-axis positioning devices (23), two welding jigs are fixedly connected to the side of the top surface of the base (1) away from the moving guide rail (3), two welding baffles (51) are arranged on the welding jigs, welding passages and marking passages are formed in the two welding baffles (51), and a control system (4) is also fixedly connected to the base (1).

2. A metal bipolar plate double-station high-speed laser welding machine according to claim 1, characterized in that: The three-axis positioning device (23) includes a laser welding cantilever (2), one end of the laser welding cantilever (2) is in sliding contact with the top surface of the moving guide rail (3) through a transverse moving member (231), a longitudinal moving member (232) is fixedly connected to the side wall of the laser welding cantilever (2), a connecting member is in sliding contact with the longitudinal moving member (232), and a vertical moving member (233) is fixedly connected to the side wall of the connecting member.

3. A metal bipolar plate double-station high-speed laser welding machine according to claim 2, characterized in that: The welding device includes an ultrafast laser (21) fixedly connected to the side of the laser welding cantilever (2) away from the longitudinal moving member (232), a scanning galvanometer (22) is slidably connected to the side wall of the vertical moving member (233), and the ultrafast laser (21) and the scanning galvanometer (22) are connected by an optical fiber.

4. A metal bipolar plate double-station high-speed laser welding machine according to claim 3, characterized in that: The welding jig includes a jig base (5) fixedly connected to the top surface of the base (1), a moving shaft is fixedly connected to the top surface of the jig base (5), a clamping tray (55) is slidably connected to the moving shaft, and two dust removal components are also fixedly connected to the top surface of the jig base (5).

5. A metal bipolar plate double-station high-speed laser welding machine according to claim 4, characterized in that: The dust removal component includes two welding baffles (51), the two welding baffles (51) are fixedly connected to the top surface of the jig base (5) through fixing rods, three mounting brackets are also fixedly connected to the top surface of the jig base (5), the three mounting brackets and the two welding baffles (51) are arranged alternately, welding dust collectors (52) are fixedly connected to the side walls of two of the mounting brackets close to one side of the two welding baffles (51), protective gas nozzles (54) are fixedly connected to the side walls of the two mounting brackets close to the other side of the two welding baffles (51), and cleaning nozzles (53) are fixedly connected to the opposite side walls of the mounting bracket located between the two welding baffles (51).

6. A metal bipolar plate double-station high-speed laser welding machine according to claim 5, characterized in that: The fence assembly includes a fence (6), the base (1) is arranged in the inner cavity of the fence (6), and an observation window (61) and an access door (62) are arranged on the side wall of the fence (6).

7. A metal bipolar plate double-station high-speed laser welding machine according to claim 6, characterized in that: Moving components are arranged at the connection of the transverse moving member (231) and the moving guide rail (3), the connection of the connecting member and the longitudinal moving member (232), the connection of the scanning galvanometer (22) and the vertical moving member (233), and the connection of the moving shaft and the jig base (5).

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