Laser welding machine and welding method for explosion-proof valve of cylindrical battery

Abstract

The cylindrical battery explosion-proof valve laser welding machine comprises a rotating assembly, a visual inspection assembly, a laser welding assembly and a defective product discharging assembly which are installed on a workbench, the rotating assembly comprises a rotating disc and a vacuum adsorption jig, and a first station, a second station, a third station and a fourth station are arranged on the periphery of the rotating disc; the four groups of vacuum adsorption jigs are uniformly distributed at the upper end of the turntable and are used for fixing a cylindrical battery explosion-proof valve; the visual detection assembly is located at the second station and used for detecting the front and back of the to-be-welded cylindrical battery explosion-proof valve; the laser welding assembly is located at a third station and used for conducting laser welding on the cylindrical battery anti-explosion valve without errors in visual front and back detection; the defective product discharging assembly is located at the fourth station and used for taking down the cylindrical battery anti-explosion valve with errors in visual front and back detection. Welding efficiency is improved, model changing is convenient, compatibility with different models is achieved, the directions of anti-explosion valves are detected, automatic discharging of defective products is achieved, and operation is convenient.

Description

Technical Field

[0001] The invention relates to the technical field of laser welding equipment, and in particular to a laser welding machine and method for a cylindrical battery explosion-proof valve. Background Art

[0002] The explosion-proof valve is a thin-walled valve body on the battery sealing plate. When the internal pressure of the battery exceeds the specified value, the explosion-proof valve body ruptures to release the pressure and prevent the battery from bursting. Its structure is ingenious, usually by laser welding two aluminum metal sheets firmly together to form a complete explosion-proof valve body.

[0003] During the welding process of the battery explosion-proof valve, it is necessary to ensure the sealing of the weld and strictly control the heat input to stabilize the weld's breaking pressure value within a certain range. When the internal pressure of the battery rises to a certain value, the aluminum sheet will rupture from the designed groove position to prevent the battery from further expanding and causing an explosion.

[0004] Laser welding is an efficient and precise welding method that uses a high-energy-density laser beam as a heat source. It uses a laser beam to fuse two aluminum sheet metal workpieces together. What needs to be noted during welding is: select appropriate laser parameters, such as power, speed, focal length, etc., to adapt to the thickness, shape, material and other factors of the aluminum plate to ensure the stability, efficiency and quality of welding. Control the assembly accuracy, clamping strength, cleanliness and other conditions of the aluminum plate to avoid defects, cracks, spatter and other problems. Surface treatment is performed on the aluminum plate before welding to remove impurities such as oxide layer and oil stains to improve the absorption and reflectivity of the laser. Auxiliary gases such as nitrogen and argon are used to protect the weld from the influence of oxygen and water vapor in the air, prevent oxidation and hydrolysis reactions, and improve the strength and toughness of the weld. According to different explosion-proof valve structures and materials, select appropriate laser welding methods, such as pulsed laser welding, continuous laser welding, composite welding laser, etc.

[0005] Traditional cylindrical battery explosion-proof valve laser welding equipment still has the following defects: First, there are problems such as low welding efficiency, inconvenient model change, and poor compatibility, which makes it difficult to adapt to the welding requirements of different types of cylindrical battery explosion-proof valves. Second, there is a problem that the wrong placement direction of the explosion-proof valve cannot be discovered in time during manual feeding, resulting in the wrong welding direction of the two aluminum metal sheets, which in turn leads to a decline in welding quality and the production of defective products. Third, the problem of automatic unloading of defective products has not been solved, and manual operation is relied on, resulting in a low degree of overall production automation, which cannot meet the needs of large-scale production. Fourth, the transmission, focusing and welding accuracy control of the laser beam are not precise enough, affecting the welding quality and stability. Summary of the invention

[0006] The technical problem to be solved by the present invention is to solve the technical problems of low welding efficiency, inconvenient model change, poor compatibility, inability to detect the wrong placement direction of the explosion-proof valve, manual reliance on defective product unloading and inaccurate laser beam control of traditional cylindrical battery explosion-proof valve laser welding equipment based on the above-mentioned deficiencies in the prior art, and provide a cylindrical battery explosion-proof valve laser welding machine that improves welding efficiency, facilitates model change, is compatible with different models, detects the direction of the explosion-proof valve, realizes automatic unloading of defective products, accurately controls the laser beam, ensures welding quality, has high positioning accuracy, saves space and is easy to operate; at the same time, the present invention also provides a welding method for the laser welding machine.

[0007] In order to solve the above-mentioned first technical problem, the technical solution of the present invention is: a cylindrical battery explosion-proof valve laser welding machine, including a workbench, a rotating component installed on the workbench, a visual inspection component, a laser welding component and a defective product unloading component, the rotating component includes a turntable and a vacuum adsorption fixture, and the turntable is surrounded by a first station, a second station, a third station and a fourth station. The vacuum adsorption fixture includes four groups, which are evenly distributed on the upper end of the turntable and respectively matched with the first station, the second station, the third station and the fourth station, and are used to fix the cylindrical battery explosion-proof valve; the first station is used for the operator to load the cylindrical battery explosion-proof valve to be welded onto the vacuum adsorption fixture, and the visual inspection component is located at the second station, including a visual positive The reverse detection camera, the visual front and back detection camera is used to detect the front and back of the cylindrical battery explosion-proof valve to be welded after the operator at the first station loads the material; the laser welding assembly is located at the third station, including a welding mechanism, the welding mechanism performs laser welding on the cylindrical battery explosion-proof valve to be welded that is correctly detected by the visual front and back detection camera, and does not perform laser welding on the cylindrical battery explosion-proof valve to be welded that is incorrectly detected; the defective product unloading assembly is located at the fourth station, including a vacuum unloading suction cup and an unloading collection box, the unloading collection box is located between the fourth station and the first station, the vacuum unloading suction cup removes the cylindrical battery explosion-proof valve to be welded that is incorrectly detected by the visual front and back detection camera from the vacuum adsorption jig of the fourth station and places it in the unloading collection box.

[0008] As a further elaboration of the present invention: The rotating assembly also includes a rotating motor. The turntable is arranged in the middle of the workbench and is flush with the workbench. The rotating motor is arranged at the lower end of the middle of the turntable. Its transmission shaft is connected with the turntable and drives the turntable to rotate relative to the workbench. A through hole is provided in the middle of the turntable, and a gantry fixing seat is provided at the upper end of the through hole. The transmission shaft of the rotating motor passes through the through hole and is connected with the gantry fixing seat to drive the turntable to rotate relative to the workbench.

[0009] The vacuum adsorption jig comprises a jig base, a cover jig, a vacuum fixed suction cup and a positioning pin. The jig base is fixedly connected to the turntable and has a suction cup groove recessed inwardly in the middle thereof. The vacuum fixed suction cup is arranged in the suction cup groove. The positioning pin comprises two, which are respectively arranged at the left and right ends of the jig base and extend upward. The cover jig matches the jig base, and has positioning pin holes matching the positioning pins at its left and right ends. Under the cooperation of the positioning pins, the positioning pin holes and the vacuum fixed suction cup, the cover jig is adsorbed and fixed or desorbed and separated relative to the jig base. More than one acupuncture points are arranged on the cover jig, and the acupuncture points are used to hold and fix the explosion-proof valve of the cylindrical battery.

[0010] The visual inspection component also includes a visual support seat, a first X-axis servo module and a first Y-axis servo module installed on the visual support seat, the visual support seat is fixedly installed on the workbench, and the visual front and back inspection camera is installed on the first X-axis servo module and the first Y-axis servo module. It can move forward, backward, left and right relative to the workbench under the driving action of the first X-axis servo module and the first Y-axis servo module to inspect the front and back of the cylindrical battery explosion-proof valve to be welded on the vacuum adsorption fixture of the second station.

[0011] The laser welding assembly also includes a welding support seat, a second X-axis servo module, a second Y-axis servo module and a Z-axis servo module installed on the welding support seat, the welding support seat is fixedly installed on the workbench, the welding mechanism is installed on the second X-axis servo module, the second Y-axis servo module and the Z-axis servo module, and can move forward, backward, left, right and up and down relative to the workbench under the driving action of the second X-axis servo module, the second Y-axis servo module and the Z-axis servo module to perform laser welding on the cylindrical battery explosion-proof valve to be welded on the vacuum adsorption fixture of the third station.

[0012] The defective product unloading assembly also includes an unloading support seat, a third X-axis servo module, a third Y-axis servo module and an unloading cylinder installed on the unloading support seat, the unloading support seat is fixedly installed on the workbench, the unloading cylinder is vertically installed on the third X-axis servo module and the third Y-axis servo module, and can move forward, backward, left and right relative to the workbench under the driving action of the third X-axis servo module and the third Y-axis servo module, the vacuum unloading suction cup is connected to the lower end of the unloading cylinder, the third X-axis servo module, the third Y-axis servo module, the unloading cylinder and the vacuum unloading suction cup cooperate with each other to remove the cylindrical battery explosion-proof valve to be welded that is incorrectly detected by the visual front and back inspection camera from the fourth station vacuum adsorption jig and place it in the unloading collection box.

[0013] The rotary motor is a DD rotary motor, the workbench is installed on the upper end of the frame, the outer periphery of the frame is provided with a protective cover, and the lower end of the frame is provided with universal wheels.

[0014] It also includes a cleaning mechanism and a control mechanism. The cleaning mechanism is located on a workbench at the rear end of the third station and includes an inert gas outlet. The inert gas outlet is used for the welding mechanism to blow out inert gas when laser welding the cylindrical battery explosion-proof valve to be welded, so as to protect the weld from oxidation and hydrolysis reactions and improve the strength and toughness of the weld. The control mechanism is electrically connected to the rotating assembly, the visual inspection assembly, the laser welding assembly, the defective product unloading assembly and the cleaning mechanism and controls their operation.

[0015] To solve the above second technical problem, the technical solution of the present invention is: a welding method of a cylindrical battery explosion-proof valve laser welding machine, the steps are as follows: a. The rotary motor drives the turntable to rotate relative to the workbench. The operator fixes the cover plate jig containing the cylindrical battery explosion-proof valve to be welded to the upper end of the jig base at the first station with the cooperation of the positioning pins, the positioning pin holes and the vacuum fixing suction cup; b. The turntable rotates the vacuum adsorption fixture with the material loaded to the second station, and the visual front and back detection camera detects the front and back of the cylindrical battery explosion-proof valve to be welded, and feeds back the front and back signal information to the control mechanism; c. After the visual front and back inspection is completed, the turntable rotates the vacuum adsorption fixture to the third station, and the welding mechanism performs laser welding on the cylindrical battery explosion-proof valve to be welded that has been detected correctly by the visual front and back inspection camera, and does not perform laser welding on the cylindrical battery explosion-proof valve to be welded that has been detected incorrectly. During laser welding, the cleaning mechanism blows out inert gas to protect the weld from oxidation and hydrolysis reactions; d. After the laser welding is completed, the turntable rotates the vacuum adsorption fixture to the fourth station, and the vacuum unloading suction cup removes the cylindrical battery explosion-proof valve to be welded that is detected incorrectly by the visual front and back inspection camera from the vacuum adsorption fixture and places it in the unloading collection box; e. After the defective products are unloaded, the turntable rotates the vacuum adsorption jig to the first station. The operator first removes the cover jig containing the welded cylindrical battery explosion-proof valve from the jig base, and then fixes the cover jig containing the cylindrical battery explosion-proof valve to be welded to the upper end of the jig base with the cooperation of the positioning pins, positioning pin holes and vacuum fixed suction cups. The turntable drives the vacuum adsorption jig to repeat the above operation.

[0016] Preferably, the welding mechanism includes a laser welding tube, a laser source, a galvanometer and a field mirror. The laser source is used to generate a laser beam. The laser welding tube is connected to the rear end of the laser source and is used to perform preliminary transmission, collimation and partial focusing adjustment on the laser beam to ensure that the laser beam can be stably transmitted in a specific direction. The laser beam processed by the laser welding tube first reaches the galvanometer and then reaches the field mirror. During the laser welding process, the galvanometer and the field mirror work together with the laser beam to complete the welding task. The galvanometer is used to guide the laser beam in the direction of the cylindrical battery explosion-proof valve to be welded to achieve fast and accurate scanning welding. The field mirror is used to focus the laser beam to the exact position of the cylindrical battery explosion-proof valve to be welded to improve the energy density of the laser and ensure the welding quality.

[0017] The beneficial effects of the present invention are as follows: the present invention adopts a four-station turntable form, realizes the continuous operation of loading, testing, welding and unloading, improves the welding efficiency, and can meet the needs of large-scale production. The equipment adopts a modular design, which makes the model change more convenient, can easily adapt to the welding requirements of different types of cylindrical battery explosion-proof valves, and has strong compatibility. Through the explosion-proof valve visual positive and negative detection component, the problem of the wrong placement direction of the explosion-proof valve during manual loading can be discovered in time, avoiding the decline in welding quality caused by the wrong welding direction, and reducing the production of defective products. The laser welding cylinder, laser source, galvanometer and field mirror in the laser welding component cooperate with each other, and can accurately control the transmission, focusing and welding accuracy of the laser beam. The inert gas blown out by the cleaning mechanism can effectively protect the weld, prevent oxidation and hydrolysis reactions, and further improve the strength and toughness of the weld, thereby ensuring the welding quality. The defective product unloading component can automatically throw the explosion-proof valve with incorrect detection into the unloading collection box, realize the automatic unloading of defective products, reduce manual operation, and improve the overall automation of production. The whole machine adopts a DD motor to drive the turntable to rotate, which has the advantages of high positioning accuracy and fast response. The rotating assembly, visual inspection assembly, laser welding assembly and defective product unloading assembly are installed on the workbench, and the workbench is installed on the upper end of the frame, which effectively saves space. The cover plate jig and the jig base are connected by vacuum fixed suction cups and positioning pins. The cover plate jig with the material placed can be quickly placed into the jig base manually, which is convenient and quick to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a first angle decomposition structural diagram of the present invention.

[0019] Figure 2 This is a second angle decomposition structural diagram of the present invention.

[0020] Figure 3 This is a third angle decomposition structural diagram of the present invention.

[0021] Figure 4 This is a fourth angle decomposition structure diagram of the present invention.

[0022] Figure 5 for Figure 3 A schematic diagram of the enlarged structure of part A.

[0023] Figure 6 for Figure 3 The enlarged structural diagram of part B is shown in the figure.

[0024] Figure 7 for Figure 4 Schematic diagram of the enlarged structure of part C in the middle.

[0025] Figure 8 for Figure 4 The enlarged structural diagram of part D in the middle.

[0026] In the figure: 1. workbench; 2. turntable; 3. fixture base; 4. cover fixture; 5. positioning pin; 6. transmission shaft; 7. visual front and back inspection camera; 8. laser welding tube; 9. vacuum unloading suction cup; 10. unloading collection box; 11. gantry fixing seat; 12. suction cup groove; 13. positioning pin hole; 14. visual support seat; 15. first X-axis servo module; 16. first Y-axis servo module; 17. welding support seat; 18. second X-axis servo module; 19. second Y-axis servo module; 20. Z-axis servo module; 21. unloading support seat; 22. third X-axis servo module; 23. third Y-axis servo module; 24. unloading cylinder; 25. protective cover; 26. universal wheel; 27. inert gas outlet. DETAILED DESCRIPTION

[0027] The structural principle and working principle of the present invention are further described in detail below with reference to the accompanying drawings.

[0028] As the first part of the present invention: like Figures 1 to 8As shown, the present invention is a laser welding machine for cylindrical battery explosion-proof valves, comprising a workbench 1, a rotating assembly, a visual inspection assembly, a laser welding assembly and a defective product unloading assembly installed on the workbench 1, the rotating assembly comprising a turntable 2 and a vacuum adsorption fixture, the turntable 2 is evenly provided with a first station, a second station, a third station and a fourth station clockwise around the front end of the workbench 1, the vacuum adsorption fixture comprises four groups, which are evenly distributed at the upper end of the turntable 2 and respectively matched with the first station, the second station, the third station and the fourth station, and are used to fix the cylindrical battery explosion-proof valve; the first station is used for the operator to load the cylindrical battery explosion-proof valve to be welded onto the vacuum adsorption fixture, the visual inspection assembly is located at the second station, and includes a visual positive and negative inspection unit. Machine 7, the visual front and back detection camera 7 is used to detect the front and back of the cylindrical battery explosion-proof valve to be welded after the operator at the first station loads the material; the laser welding component is located at the third station, including a welding mechanism, the welding mechanism performs laser welding on the cylindrical battery explosion-proof valve to be welded that is correctly detected by the visual front and back detection camera 7, and does not perform laser welding on the cylindrical battery explosion-proof valve to be welded that is incorrectly detected; the defective product unloading component is located at the fourth station, including a vacuum unloading suction cup 9 and an unloading collection box 10, the unloading collection box 10 is located between the fourth station and the first station, the vacuum unloading suction cup 9 removes the cylindrical battery explosion-proof valve to be welded that is incorrectly detected by the visual front and back detection camera 7 from the vacuum adsorption fixture of the fourth station and places it in the unloading collection box 10.

[0029] like Figure 8 As shown, the rotating assembly also includes a rotating motor (not shown in the figure), the turntable 2 is arranged in the middle of the workbench 1 and is flush with the workbench 1, the rotating motor is arranged at the lower end of the middle of the turntable 2, and its transmission shaft 6 is connected with the turntable 2 and drives the turntable 2 to rotate clockwise relative to the workbench 1, a through hole is provided in the middle of the turntable 2, and a gantry fixing seat 11 is provided at the upper end of the through hole, and the transmission shaft 6 of the rotating motor passes through the through hole and is connected with the gantry fixing seat 11 to drive the turntable 2 to rotate clockwise relative to the workbench 1.

[0030] like Figure 7As shown, the vacuum adsorption jig includes a jig base 3, a cover jig 4, a vacuum fixed suction cup (not shown in the figure) and a positioning pin 5. The jig base 3 is fixedly connected to the turntable 2, and a suction cup groove 12 is provided in the middle thereof. The vacuum fixed suction cup is arranged in the suction cup groove 12. The positioning pin 5 includes two, which are respectively arranged at the left and right ends of the jig base 3 and extend upward. The cover jig 4 matches the jig base 3, and its left and right ends are provided with positioning pin holes 13 matching the positioning pin 5. Under the cooperation of the positioning pin 5, the positioning pin hole 13 and the vacuum fixed suction cup, the cover jig 4 is adsorbed and fixed or desorbed and separated relative to the jig base 3. More than one acupuncture point is provided on the cover jig 4, and the acupuncture point is used to hold and fix the cylindrical battery explosion-proof valve. In this embodiment, the acupuncture points include 10, which are divided into two rows and evenly distributed on the cover jig 4.

[0031] like Figure 5 As shown, the visual inspection component also includes a visual support seat 14, a first X-axis servo module 15 and a first Y-axis servo module 16 installed on the visual support seat 14, the visual support seat 14 is fixedly installed on the workbench 1, and the visual front and back inspection camera 7 is installed on the first X-axis servo module 15 and the first Y-axis servo module 16, and can move forward, backward, left and right relative to the workbench 1 under the driving action of the first X-axis servo module 15 and the first Y-axis servo module 16 to inspect the front and back of the cylindrical battery explosion-proof valve to be welded on the vacuum adsorption fixture of the second station.

[0032] like Figure 8 As shown, the laser welding assembly also includes a welding support seat 17, a second X-axis servo module 18, a second Y-axis servo module 19 and a Z-axis servo module 20 installed on the welding support seat 17, the welding support seat 17 is fixedly installed on the workbench 1, and the welding mechanism is installed on the second X-axis servo module 18, the second Y-axis servo module 19 and the Z-axis servo module 20, and can move forward, backward, left, right and up and down relative to the workbench 1 under the driving action of the second X-axis servo module 18, the second Y-axis servo module 19 and the Z-axis servo module 20 to perform laser welding on the cylindrical battery explosion-proof valve to be welded on the vacuum adsorption fixture of the third station.

[0033] like Figure 6As shown, the defective product unloading assembly also includes an unloading support seat 21, a third X-axis servo module 22, a third Y-axis servo module 23 and an unloading cylinder 24 installed on the unloading support seat 21, the unloading support seat 21 is fixedly installed on the workbench 1, the unloading cylinder 24 is vertically installed on the third X-axis servo module 22 and the third Y-axis servo module 23, and can move forward, backward, left and right relative to the workbench 1 under the driving action of the third X-axis servo module 22 and the third Y-axis servo module 23, the vacuum unloading suction cup 9 is connected to the lower end of the unloading cylinder 24, the third X-axis servo module 22, the third Y-axis servo module 23, the unloading cylinder 24 and the vacuum unloading suction cup 9 cooperate with each other to remove the cylindrical battery explosion-proof valve to be welded that is incorrectly detected by the visual front and back inspection camera 7 from the fourth station vacuum adsorption jig and place it in the unloading collection box 10.

[0034] like Figure 1 to Figure 4 As shown, the rotary motor is a DD rotary motor, the workbench 1 is installed on the upper end of the frame, a protective cover 25 is provided on the outer periphery of the frame, and universal wheels 26 are provided on the lower ends of the four sides of the frame.

[0035] like Figure 8 As shown, it also includes a cleaning mechanism and a control mechanism (not shown in the figure). The cleaning mechanism is located on the workbench 1 at the rear end of the third station, and includes an inert gas outlet 27. The inert gas outlet 27 is used for the welding mechanism to blow out inert gas when laser welding the cylindrical battery explosion-proof valve to be welded, so as to protect the weld from oxidation and hydrolysis reactions and improve the strength and toughness of the weld. The control mechanism is electrically connected to the rotating assembly, the visual inspection assembly, the laser welding assembly, the defective product unloading assembly and the cleaning mechanism and controls their operation.

[0036] The second technical problem is as the second part of the present invention: a welding method of a cylindrical battery explosion-proof valve laser welding machine, the steps are as follows: a. The rotary motor drives the turntable 2 to rotate clockwise relative to the workbench 1. The operator fixes the cover plate jig 4 containing the cylindrical battery explosion-proof valve to be welded to the upper end of the jig base 3 under the cooperation of the positioning pin 5, the positioning pin hole 13 and the vacuum fixing suction cup at the first station; b. The turntable 2 rotates the vacuum adsorption fixture with the material loaded to the second station, and the visual positive and negative detection camera 7 detects the positive and negative sides of the cylindrical battery explosion-proof valve to be welded, and feeds back the positive and negative signal information to the control mechanism; c. After the visual front and back inspection is completed, the turntable 2 rotates the vacuum adsorption fixture to the third station, and the welding mechanism performs laser welding on the cylindrical battery explosion-proof valve to be welded that is correctly detected by the visual front and back inspection camera 7, and does not perform laser welding on the cylindrical battery explosion-proof valve to be welded that is incorrectly detected. During laser welding, the cleaning mechanism blows out inert gas to protect the weld from oxidation and hydrolysis reactions; d. After the laser welding is completed, the turntable 2 rotates the vacuum adsorption fixture to the fourth station, and the vacuum unloading suction cup 9 removes the cylindrical battery explosion-proof valve to be welded that is detected incorrectly by the visual front and back inspection camera 7 from the vacuum adsorption fixture and places it in the unloading collection box 10; e. After the defective products are unloaded, the turntable 2 rotates the vacuum adsorption jig to the first station. The operator first removes the cover jig 4 containing the welded cylindrical battery explosion-proof valve from the jig base 3, and then fixes the cover jig 4 containing the cylindrical battery explosion-proof valve to be welded to the upper end of the jig base 3 under the cooperation of the positioning pin 5, the positioning pin hole 13 and the vacuum fixed suction cup. The turntable 2 drives the vacuum adsorption jig to repeat the above operation.

[0037] Furthermore, the welding mechanism includes a laser welding tube 8, a laser source (not shown in the figure), a galvanometer (not shown in the figure) and a field mirror (not shown in the figure). The laser source is used to generate a laser beam. The laser welding tube 8 is connected to the rear end of the laser source and is used to perform preliminary transmission, collimation and partial focusing adjustment on the laser beam to ensure that the laser beam can be stably transmitted in a specific direction. The laser beam processed by the laser welding tube 8 first reaches the galvanometer and then reaches the field mirror. During the laser welding process, the galvanometer and the field mirror work together with the laser beam to complete the welding task. The galvanometer is used to guide the laser beam in the direction of the cylindrical battery explosion-proof valve to be welded to achieve fast and accurate scanning welding. The field mirror is used to focus the laser beam to the exact position of the cylindrical battery explosion-proof valve to be welded to improve the energy density of the laser and ensure the welding quality.

[0038] The above description is only a preferred embodiment of the present invention. Any slight modification, equivalent changes and modifications made to the above embodiments according to the technical solution of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A cylindrical battery explosion-proof valve laser welding machine, characterized in that: It includes a workbench, a rotating component, a visual inspection component, a laser welding component and a defective product unloading component installed on the workbench, the rotating component includes a turntable and a vacuum adsorption fixture, the turntable is provided with a first station, a second station, a third station and a fourth station around the turntable, the vacuum adsorption fixture includes four groups, which are evenly distributed on the upper end of the turntable and respectively matched with the first station, the second station, the third station and the fourth station, and are used to fix the cylindrical battery explosion-proof valve; the first station is used for the operator to load the cylindrical battery explosion-proof valve to be welded onto the vacuum adsorption fixture, the visual inspection component is located at the second station, and includes a visual front and back inspection camera, and the visual front and back inspection camera is used to inspect Measure the front and back of the cylindrical battery explosion-proof valve to be welded after the operator at the first station loads the material; the laser welding assembly is located at the third station, including a welding mechanism, and the welding mechanism performs laser welding on the cylindrical battery explosion-proof valve to be welded that has been detected correctly by the visual front and back detection camera, and does not perform laser welding on the cylindrical battery explosion-proof valve to be welded that has been detected incorrectly; the defective product unloading assembly is located at the fourth station, including a vacuum unloading suction cup and an unloading collection box, and the unloading collection box is located between the fourth station and the first station, and the vacuum unloading suction cup removes the cylindrical battery explosion-proof valve to be welded that has been detected incorrectly by the visual front and back detection camera from the vacuum adsorption fixture of the fourth station and places it in the unloading collection box.

2. According to claim 1, a cylindrical battery explosion-proof valve laser welding machine is characterized in that: The rotating assembly also includes a rotating motor. The turntable is arranged in the middle of the workbench and is flush with the workbench. The rotating motor is arranged at the lower end of the middle of the turntable. Its transmission shaft is connected with the turntable and drives the turntable to rotate relative to the workbench. A through hole is provided in the middle of the turntable, and a gantry fixing seat is provided at the upper end of the through hole. The transmission shaft of the rotating motor passes through the through hole and is connected with the gantry fixing seat to drive the turntable to rotate relative to the workbench.

3. A cylindrical battery explosion-proof valve laser welding machine according to claim 2, characterized in that: The vacuum adsorption jig comprises a jig base, a cover jig, a vacuum fixed suction cup and a positioning pin. The jig base is fixedly connected to the turntable and has a suction cup groove recessed inwardly in the middle thereof. The vacuum fixed suction cup is arranged in the suction cup groove. The positioning pin comprises two, which are respectively arranged at the left and right ends of the jig base and extend upward. The cover jig matches the jig base, and has positioning pin holes matching the positioning pins at its left and right ends. Under the cooperation of the positioning pins, the positioning pin holes and the vacuum fixed suction cup, the cover jig is adsorbed and fixed or desorbed and separated relative to the jig base. More than one acupuncture points are arranged on the cover jig, and the acupuncture points are used to hold and fix the explosion-proof valve of the cylindrical battery.

4. A cylindrical battery explosion-proof valve laser welding machine according to claim 3, characterized in that: The visual inspection component also includes a visual support seat, a first X-axis servo module and a first Y-axis servo module installed on the visual support seat, the visual support seat is fixedly installed on the workbench, and the visual front and back inspection camera is installed on the first X-axis servo module and the first Y-axis servo module. It can move forward, backward, left and right relative to the workbench under the driving action of the first X-axis servo module and the first Y-axis servo module to inspect the front and back of the cylindrical battery explosion-proof valve to be welded on the vacuum adsorption fixture of the second station.

5. A cylindrical battery explosion-proof valve laser welding machine according to claim 4, characterized in that: The laser welding assembly also includes a welding support seat, a second X-axis servo module, a second Y-axis servo module and a Z-axis servo module installed on the welding support seat, the welding support seat is fixedly installed on the workbench, the welding mechanism is installed on the second X-axis servo module, the second Y-axis servo module and the Z-axis servo module, and can move forward, backward, left, right and up and down relative to the workbench under the driving action of the second X-axis servo module, the second Y-axis servo module and the Z-axis servo module to perform laser welding on the cylindrical battery explosion-proof valve to be welded on the vacuum adsorption fixture of the third station.

6. A cylindrical battery explosion-proof valve laser welding machine according to claim 5, characterized in that: The defective product unloading assembly also includes an unloading support seat, a third X-axis servo module, a third Y-axis servo module and an unloading cylinder installed on the unloading support seat, the unloading support seat is fixedly installed on the workbench, the unloading cylinder is vertically installed on the third X-axis servo module and the third Y-axis servo module, and can move forward, backward, left and right relative to the workbench under the driving action of the third X-axis servo module and the third Y-axis servo module, the vacuum unloading suction cup is connected to the lower end of the unloading cylinder, the third X-axis servo module, the third Y-axis servo module, the unloading cylinder and the vacuum unloading suction cup cooperate with each other to remove the cylindrical battery explosion-proof valve to be welded that is incorrectly detected by the visual front and back inspection camera from the fourth station vacuum adsorption jig and place it in the unloading collection box.

7. According to claim 1, a cylindrical battery explosion-proof valve laser welding machine is characterized in that: The rotary motor is a DD rotary motor, the workbench is installed on the upper end of the frame, the outer periphery of the frame is provided with a protective cover, and the lower ends of the four sides of the frame are provided with universal wheels.

8. The cylindrical battery explosion-proof valve laser welding machine according to claim 7 is characterized in that: It also includes a cleaning mechanism and a control mechanism. The cleaning mechanism is located on a workbench at the rear end of the third station and includes an inert gas outlet. The inert gas outlet is used for the welding mechanism to blow out inert gas when laser welding the cylindrical battery explosion-proof valve to be welded, so as to protect the weld from oxidation and hydrolysis reactions and improve the strength and toughness of the weld. The control mechanism is electrically connected to the rotating assembly, the visual inspection assembly, the laser welding assembly, the defective product unloading assembly and the cleaning mechanism and controls their operation.

9. The welding method of the cylindrical battery explosion-proof valve laser welding machine according to any one of claims 3 to 8, characterized in that: Here are the steps: a. The rotary motor drives the turntable to rotate relative to the workbench. The operator fixes the cover plate jig containing the cylindrical battery explosion-proof valve to be welded to the upper end of the jig base at the first station with the cooperation of the positioning pins, the positioning pin holes and the vacuum fixing suction cup; b. The turntable rotates the vacuum adsorption fixture with the material loaded to the second station, and the visual front and back detection camera detects the front and back of the cylindrical battery explosion-proof valve to be welded, and feeds back the front and back signal information to the control mechanism; c. After the visual front and back inspection is completed, the turntable rotates the vacuum adsorption fixture to the third station, and the welding mechanism performs laser welding on the cylindrical battery explosion-proof valve to be welded that has been detected correctly by the visual front and back inspection camera, and does not perform laser welding on the cylindrical battery explosion-proof valve to be welded that has been detected incorrectly. During laser welding, the cleaning mechanism blows out inert gas to protect the weld from oxidation and hydrolysis reactions; d. After the laser welding is completed, the turntable rotates the vacuum adsorption fixture to the fourth station, and the vacuum unloading suction cup removes the cylindrical battery explosion-proof valve to be welded that is detected incorrectly by the visual front and back inspection camera from the vacuum adsorption fixture and places it in the unloading collection box; e. After the defective products are unloaded, the turntable rotates the vacuum adsorption jig to the first station. The operator first removes the cover jig containing the welded cylindrical battery explosion-proof valve from the jig base, and then fixes the cover jig containing the cylindrical battery explosion-proof valve to be welded to the upper end of the jig base with the cooperation of the positioning pins, positioning pin holes and vacuum fixed suction cups. The turntable drives the vacuum adsorption jig to repeat the above operation.

10. The welding method of a cylindrical battery explosion-proof valve laser welding machine according to claim 9 is characterized in that: The welding mechanism includes a laser welding tube, a laser source, a galvanometer and a field mirror. The laser source is used to generate a laser beam. The laser welding tube is connected to the rear end of the laser source and is used to perform preliminary transmission, collimation and partial focusing adjustment on the laser beam to ensure that the laser beam can be stably transmitted in a specific direction. The laser beam processed by the laser welding tube first reaches the galvanometer and then reaches the field mirror. During the laser welding process, the galvanometer and the field mirror work together with the laser beam to complete the welding task. The galvanometer is used to guide the laser beam in the direction of the cylindrical battery explosion-proof valve to be welded to achieve fast and accurate scanning welding. The field mirror is used to focus the laser beam to the exact position of the cylindrical battery explosion-proof valve to be welded to improve the energy density of the laser and ensure the welding quality.

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