Welding System for Metal Laminates and Its Welding Method

Abstract

The present invention provides a welding system for metal laminates and a welding method thereof. The system includes a metal laminate positioning device and a welding robot. The metal laminate positioning device includes a machine base. One end of the top surface of the machine base is fixedly provided with a fixed seat, and the other end of the top surface of the machine base is slidably provided with a sliding seat that can approach or move away from the fixed seat. A left end positioning block is horizontally fixed on the top surface of the fixed seat, and a right end positioning block is horizontally fixed on the top surface of the sliding seat. The two left end positioning blocks and the two right end positioning blocks are respectively used for clamping both ends of the metal laminate for positioning. A rear side positioning block and a front side pushing and positioning component are relatively fixedly arranged longitudinally on the top surface of the fixed seat, and a rear side positioning block and a front side pushing and positioning component are also relatively fixedly arranged longitudinally on the top surface of the sliding seat. The left end positioning block, the right end positioning block, the rear side positioning block, and the front side pushing and positioning component together form a square positioning space. The welding system and the welding method of the present invention can improve production efficiency, welding quality, and production safety, and reduce labor intensity.

Description

Technical Field

[0001] The present invention relates to the technical field of metal laminated plate welding, and particularly relates to a welding system and a welding method for metal laminated plates. Background Art

[0002] The metal laminated plate involved in the present invention is a square support plate formed by folding and welding the metal panel around its four sides. Currently, when welding metal laminated plates, excessive reliance on manual operation by operators has problems such as high labor intensity of personnel, poor welding quality, low production efficiency, high safety risks, and easy cause of personal injuries. Therefore, there is an urgent need to provide a technical solution to solve the above technical problems. Summary of the Invention

[0003] In view of the above, it is necessary for the present invention to provide a welding system and a welding method for metal laminated plates to improve production efficiency, welding quality, and production safety, and reduce labor intensity.

[0004] The technical solution of the present invention:

[0005] A welding system for metal laminated plates includes a metal laminated plate positioning device and a welding robot. The metal laminated plate positioning device includes a machine base. One end of the top surface of the machine base is fixedly provided with a fixed seat, and the other end of the top surface of the machine base is slidably provided with a sliding seat that can approach or move away from the fixed seat. A left end positioning block is horizontally fixed on the top surface of the fixed seat, and a right end positioning block is horizontally fixed on the top surface of the sliding seat. The two left end positioning blocks and the two right end positioning blocks are respectively used for clamping both ends of the metal laminated plate for positioning. A rear side positioning block and a front side pushing and positioning component are longitudinally and oppositely fixed on the top surface of the fixed seat, and a rear side positioning block and a front side pushing and positioning component are also longitudinally and oppositely fixed on the top surface of the sliding seat. The left end positioning block, the right end positioning block, the rear side positioning block, and the front side pushing and positioning component together form a square positioning space. After the metal laminated plate is placed, the sliding seat drives the two right end positioning blocks to move a predetermined distance towards the left end positioning block to clamp and position the left and right ends of the metal laminated plate, and then the two front side pushing and positioning components push the metal laminated plate to move a predetermined distance towards the rear side positioning block to position the front and rear sides of the metal laminated plate. The welding robot is used to weld the metal laminated plate positioned by the metal laminated plate positioning device.

[0006] Further, the fixed seat and the sliding seat are respectively provided with a flipping and shaping mechanism for cooperating with the rear side positioning block and the front side pushing and positioning component to clamp and shape the side plates of the metal laminated plate. Two sets of pressing and shaping mechanisms are oppositely provided on the fixed seat, and two sets of pressing and shaping mechanisms are also oppositely provided on the sliding seat to press and shape the welding joints at the four corners of the metal laminated plate and then weld them by the welding robot.

[0007] Further, the flipping and shaping mechanism includes two bearing seats relatively fixed on the sliding seat. A flipping shaft is rotatably mounted on the two bearing seats through bearings. A flipping driving member for driving the flipping shaft to reciprocally flip is mounted outside one of the bearing seats. A flipping frame is fixedly connected to the flipping shaft. One end of the flipping frame is fixed to the flipping shaft, and the other end extends radially along the flipping shaft. Shaping assemblies are respectively fixed on both sides of the extending end of the flipping frame for cooperatively clamping and shaping the front and rear sides of the metal laminate with the rear positioning block and the front pushing and positioning assembly.

[0008] Further, the shaping assembly includes a shaping driving member and a shaping block. The shaping driving member is fixed on the flipping frame, and the shaping block is fixed to the driving end of the shaping driving member.

[0009] Further, the pressing and shaping mechanism includes a fixing frame. One end of the fixing frame is fixed on the sliding seat, and the other end extends outside the fixing frame. A swing arm is hinged to the top end of the fixing frame. A shaping die for shaping the four corners of the metal laminate is fixed to one end of the swing arm. A base extending outward from the fixing frame is hinged to the bottom end of the fixing frame. A lifting driving member is fixed on the base, and the lifting end of the lifting driving member is hinged to the other end of the swing arm.

[0010] Further, a hinge seat is fixed on the swing arm, and the bottom end of the hinge seat is hinged to the top end of the fixing frame through a hinge shaft.

[0011] Further, a limiting block is fixed at a position near the hinge seat at the top end of the fixing frame. A limiting groove with an upward opening is formed in the limiting block. When the swing arm presses down the metal laminate, it is limited in the limiting groove of the limiting block.

[0012] Further, the shaping die includes a connecting section and a die section integrally connected in an L shape. One end of the connecting section is fixed to the swing arm, and a pressing block protrudes downward from the extending end of the die section. A shaping block adapted to the hanging hole of the metal laminate protrudes downward from the lower surface of the pressing block.

[0013] Further, the welding robot includes a movable robotic arm and a laser welding head fixed to the free end of the movable robotic arm. The movable robotic arm is used to drive the laser welding head to lift, translate and rotate, so that the laser welding head can be respectively moved to the welding positions at the four corners of the metal laminate for welding.

[0014] The present invention also provides a welding method for a welding system of metal laminates, including the following steps: placing the metal laminate to be welded in a square positioning space formed by a fixed seat and a sliding seat, driving the right-end positioning block on the sliding seat to move a predetermined distance, so as to position the left and right ends of the metal laminate, actuating the front-side pushing positioning assembly, so as to position the front and back sides of the metal laminate, clamping and shaping the side plates of the metal laminate through the flipping and shaping mechanisms respectively arranged oppositely on the fixed seat and the sliding seat and the rear-side positioning block and the front-side pushing positioning assembly cooperating therewith, pressing and shaping the welding positions at the four corners of the metal laminate through a pressing and shaping mechanism, and then performing welding by a welding robot.

[0015] Advantages of the present invention:

[0016] The welding system for metal laminates of the present invention is provided with a metal laminate positioning device and a welding robot cooperating with each other. The metal laminate to be welded is placed in a square positioning space formed by a fixed seat and a sliding seat. The right-end positioning block on the sliding seat is driven to move a predetermined distance, so as to position the left and right ends of the metal laminate. The front-side pushing positioning assembly is actuated, so as to position the front and back sides of the metal laminate. The side plates of the metal laminate are clamped and shaped through the flipping and shaping mechanisms respectively arranged oppositely on the fixed seat and the sliding seat and the rear-side positioning block and the push plate cooperating therewith, ensuring the perpendicularity of the side plates, which is beneficial to the precise butt joint at the four corners of the metal laminate. After the welding positions at the four corners of the metal laminate are pressed and shaped through a pressing and shaping mechanism, welding is then performed by a welding robot. In this way, the welding position can be ensured to be precise, the welding is firm, it is easy to realize the automated production of a large number of metal laminates, which is beneficial to improving production efficiency and production safety and reducing the labor intensity of workers.

[0017] The preferred implementation embodiments of the present invention and their beneficial effects will be further described in detail in conjunction with the specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification, and are used together with the following specific embodiments to explain the present invention, but should not constitute a limitation to the present invention. In the drawings,

[0019] Figure 1 is a first perspective three-dimensional view of the metal laminate of the present invention;

[0020] Figure 2 is a second perspective three-dimensional view of the metal laminate of the present invention;

[0021] Figure 3 is Figure 2 an enlarged view of part A in

[0022] Figure 4 is a three-dimensional view of the welding system for metal laminates of the present invention;

[0023] Figure 5 This is a reference top view of the usage state of the metal laminate positioning device of the welding system for metal laminates of the present invention;

[0024] Figure 6 This is a perspective view of the flipping and shaping mechanism of the welding system for metal laminates of the present invention;

[0025] Figure 7 This is a perspective view of the pressing and shaping mechanism of the welding system for metal laminates of the present invention;

[0026] Figure 8 This is a state diagram when the pressing and shaping mechanism of the welding system for metal laminates of the present invention is opened;

[0027] Figure 9 This is a state diagram when the pressing and shaping mechanism of the welding system for metal laminates of the present invention is pressed;

[0028] Figure 10 This is a perspective view of the shaping mold of the welding system for metal laminates of the present invention. Detailed Description of the Invention

[0029] The following describes in detail the specific embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustration and explanation of the present invention, and are not intended to limit the present invention.

[0030] Please refer to Figures 1 to 3, the present invention provides a metal laminated board 1, which includes a rectangular main board 11. At both ends of the main board 11, right-angled bends are respectively formed to form end boards 12. At both ends of each end board 12, right-angled bends are respectively formed to form vertical flanges 13 and horizontal flanges 14. The horizontal flanges 14 are arranged parallel to the main board 11, and one end of each vertical flange 13 abuts against the surface of the corresponding horizontal flange 14. The outer side surface of each vertical flange 13 is flush with the end surface of the corresponding horizontal flange 14. On both sides of the main board 11, right-angled bends are respectively formed to form side boards 15. On each side board 15, a right-angled bend is formed inward to form a flat board 16, and the flat board 16 is arranged parallel to the main board 11. At both ends of each side board 15 and the flat board 16, communicating hanging holes 10 are provided for mounting on a support frame. At one end of each vertical flange 13 close to the main board 11, a cut corner 19 is provided, and cut corners 19 are also provided at both ends of each side board 15. The cut surfaces of the two cut corners 19 abut against each other. The size of the cut corner 19 is preferably 45 degrees to improve the structural strength and aesthetic degree of the product. Both ends of each flat board 16 are welded to the corresponding horizontal flanges 14. The end surface of each flat board 16 abuts against the end board 12 for welding to further improve the structural strength of the laminated board. The outer surface of each flat board 16 is flush with the end surface of the end board 12, so that the bottom surface of the metal laminated board 1 remains flat and improves the aesthetic degree of the product. In order to further improve the structural strength and safety of the metal laminated board 1, a reinforcing plate 17 is formed by a right-angled bend inward on each flat board 16. The reinforcing plate 17 is arranged parallel to the side board 15. The side board 15, the flat board 16 and the reinforcing plate 17 form a square support rod structure to provide a supporting effect for the main board 11. A U-shaped hanging member (not shown in the figure) is welded at each hanging hole 10, and the opening of the U-shaped hanging member faces the hanging hole 10 of the flat board 16. Insertion holes 18 are provided at both ends of each reinforcing plate 17 for inserting the U-shaped hanging member for welding. The metal laminated board 1 of the present invention can be formed by cutting the four corners of a metal thin plate such as a stainless steel plate or an iron plate, then performing a bending operation, and finally welding both ends of each flat board 16 to the corresponding horizontal flanges 14. The manufacturing is simple and convenient, the raw materials can be fully utilized, the manufacturing cost is low, the structural strength is high, and it is easy to realize large-scale automated production.

[0031] Please refer to Figure 4 and Figure 5, the present invention also provides a welding system for the above-mentioned metal laminate 1, including a metal laminate positioning device 2 and a welding robot 3. The welding robot 3 is used to weld the metal laminate positioned by the metal laminate positioning device 2. The metal laminate positioning device 2 includes a base 21, and a fixed seat 22 is fixed at one end of the top surface of the base 21. A sliding seat 23 is slidably arranged at the other end of the top surface of the base 21 so as to be close to or away from the fixed seat 22. Two left-end positioning blocks 221 are horizontally fixed on the top surface of the fixed seat 22, and two right-end positioning blocks 231 are horizontally fixed on the top surface of the sliding seat 23. The two left-end positioning blocks 221 and the two right-end positioning blocks 231 are respectively used to clamp the two ends of the metal laminate 1 for positioning. A rear-side positioning block 222 and a front-side pushing and positioning component 223 are relatively fixed longitudinally on the top surface of the fixed seat 22, and a rear-side positioning block 222 and a front-side pushing and positioning component 223 are also relatively fixed longitudinally on the top surface of the sliding seat 23. The two left-end positioning blocks 221, the two right-end positioning blocks 231, the two groups of rear-side positioning blocks 222 and the front-side pushing and positioning component 223 together form a square positioning space. After the metal laminate 1 is placed therein, the sliding seat 23 drives the two right-end positioning blocks 231 to move a predetermined distance towards the left-end positioning blocks 221, and then clamps the left and right ends of the metal laminate 1 for positioning. Then, the two front-side pushing and positioning components 223 push the metal laminate 1 to move a predetermined distance towards the rear-side positioning block 222 to position the front and rear sides of the metal laminate 1.

[0032] In this embodiment, the front-side pushing and positioning component 223 includes a telescopic driving member 2231 fixed on the fixed seat 22 and a push plate 2232 fixed on the telescopic end of the telescopic driving member 2231. The metal laminate 1 is pushed and positioned by the push plate 2232.

[0033] The fixed seat 22 and the sliding seat 23 are respectively provided with a flipping and shaping mechanism 24, which is used to cooperate with the rear-side positioning block 222 and the push plate 2232 of the front-side pushing and positioning component 223 to clamp and shape the side plates 15 of the metal laminate 1, so as to prevent the product from deforming and improve the product quality. Two sets of pressing and shaping mechanisms 25 are relatively arranged on the fixed seat 22, and two sets of pressing and shaping mechanisms 25 are also relatively arranged on the sliding seat 23 to press and shape the welding joints at the four corners of the metal laminate 1 and then perform welding by the welding robot 3.

[0034] The welding system for metal laminates of the present invention is configured by coordinating a metal laminate positioning device 2 and a welding robot 3. The metal laminate 1 to be welded is placed within a square positioning space formed by a fixed seat 22 and a sliding seat 23. The right-end positioning block 231 is driven by the sliding seat 23 to move a predetermined distance, positioning the left and right ends of the metal laminate 1. The front-side pushing positioning assembly 223 is actuated to position the front and back sides of the metal laminate 1. The side plates 15 of the metal laminate 1 are clamped and shaped by the flipping and shaping mechanisms 24 oppositely arranged on the fixed seat 22 and the sliding seat 23, and the cooperating rear-side positioning block 222 and push plate 2232, ensuring the perpendicularity of the side plates 15 and facilitating the precise docking of the four corners of the metal laminate 1. After the four corners of the welding positions of the metal laminate 1 are clamped and shaped by the pressing and shaping mechanism 25, welding is then performed by the welding robot 3. In this way, the welding position can be ensured to be precise, the welding is firm, it is easy to realize the automated production of a large number of metal laminates 1, which is beneficial to improving production efficiency and production safety, and reducing the labor intensity of workers.

[0035] A sliding drive mechanism 26 is provided between the machine base 21 and the sliding seat 23. The sliding drive mechanism 26 includes two parallel guide rails fixed to the top surface of the machine base 21. A slider is fixed to the bottom surface of the sliding seat 23, and the slider is slidably disposed on the guide rails. A driving member for driving the sliding seat 23 to reciprocally slide along the guide rails is provided on the machine base 21. The driving member is fixed to the top surface of the machine base 21 and is located between the two parallel guide rails. The driving member uses a cylinder, and the piston rod of the cylinder is connected to the sliding seat 23. The reciprocating sliding of the sliding seat 23 along the guide rails is driven by the telescopic movement of the cylinder. With such a design, the structure is simple, it is easy to realize the reciprocating sliding movement of the sliding seat 23, and the stability of the operation is ensured.

[0036] Please refer to Figure 6 , in this embodiment, the flipping and shaping mechanism 24 includes two bearing seats 241 relatively fixed to the sliding seat 23. A flipping shaft 242 is rotatably mounted on the two bearing seats 241 through bearings. A flipping driving member 243 for driving the flipping shaft 242 to reciprocally flip is mounted outside one of the bearing seats 241. The flipping driving member 243 is preferably a flipping cylinder. The flipping cylinder is fixed to the outer side surface of the bearing seat 241, and the output shaft of the flipping cylinder is connected to the flipping shaft 242, thereby driving the flipping shaft 242 to reciprocally flip. A flipping frame 244 is fixedly connected to the flipping shaft 242. One end of the flipping frame 244 is fixed to the flipping shaft 242, and the other end extends radially along the flipping shaft 242. Shaping assemblies 245 are respectively fixed to both sides of the extending end of the flipping frame 244 for cooperating with the rear-side positioning block 222 and the front-side pushing positioning assembly 223 to clamp and shape the front and back sides of the metal laminate 1.

[0037] In this embodiment, the flipping and shaping mechanism 24 drives the shaping assembly 245 on the flipping frame 244 through the flipping shaft 242 to clamp and shape the front and rear sides of the metal laminate 1. When the flipping frame 244 drives the shaping assembly 245 to flip outwards, it is convenient to place the metal laminate 1 for positioning, avoiding occupying too much operating space and making the picking and placing of the metal laminate 1 more convenient. After the metal laminate 1 is positioned, the flipping shaft 242 drives the shaping assembly 245 on the flipping frame 244 to flip into the cavity of the metal laminate 1, so that the shaping assembly 245 can cooperate with the rear positioning block 222 and the front pushing and positioning assembly 223 to clamp and shape the front and rear sides of the metal laminate 1. The flipping and shaping mechanism 24 with the above structure is simple and compact in structure, easy to control the movement, can quickly realize the shaping of the metal laminate 1, and is beneficial to improving the aesthetic degree of the shape of the metal laminate 1.

[0038] In this embodiment, the flipping frame 244 includes two support rods 2441 and a flipping plate 2442. An installation groove adapted to the size of the support rod 2441 is provided in the middle position of the flipping shaft 242. One end of each support rod 2441 is fixed in the corresponding installation groove by bolts and is perpendicular to the flipping shaft 242. The other ends of the two support rods 2441 are fixed with a flipping plate 2442, and the flipping plate 2442 is T-shaped connected with the two support rods 2441. The flipping frame 244 with the above structure is simple in structure, convenient to process, easy to install, and easy to realize a stable flipping action.

[0039] In this embodiment, the shaping assembly 245 includes a shaping driving member 2451 and a shaping block 2452. The shaping driving member 2451 is fixed to one end of the flipping plate 2442, and the shaping block 2452 is fixed to the driving end of the shaping driving member 2451. The shaping driving member 2451 drives the shaping block 2452 to abut against the reinforcing plate 17 of the metal laminate 1 for shaping. The shaping driving member 2451 is preferably a cylinder driving member, which is easy to realize the telescopic shaping action and has a low manufacturing cost.

[0040] Please refer to Figures 7 to 9 , in this embodiment, the pressing and shaping mechanism 25 includes a fixed frame 251. One end of the fixed frame 251 is fixed to the sliding seat 23, and the other end extends to the outside of the fixed frame 251. A swing arm 252 is hinged to the top end of the fixed frame 251, and a shaping die 253 for shaping the four corners of the metal laminate 1 is fixed to one end of the swing arm 252. A base 254 extending outwards of the fixed frame 251 is hinged to the bottom end of the fixed frame 251, and a lifting driving member 255 is fixed on the base 254. The lifting end of the lifting driving member 255 is hinged to the other end of the swing arm 252 to drive the swing arm 252 and the shaping die 253 to swing reciprocally around the hinge at the top end of the fixed frame 251.

[0041] In this embodiment, the pressing and shaping mechanism 25 drives the swing arm 252 and the shaping die 253 to swing around the hinge at the top of the fixed frame 251 through the lifting driving member 255 to the right-angle welding position of the shaping die 253 pressing the metal laminate 1, and cooperates with the right-end positioning block 231 for clamping, so as to ensure the precise docking of the right-angle welding position of the metal laminate 1. The pressing and shaping mechanism 25 designed with the above structure is compact in structure, simple in action control, and easy to realize the rapid shaping of the four corners of the metal laminate 1.

[0042] In this embodiment, the fixed frame 251 includes a support plate and an L-shaped connecting rod. One end of the L-shaped connecting rod is fixed on the support plate, and the other end is fixed on the fixed frame 251. An articulated seat 256 is fixed on the swing arm 252, and the bottom end of the articulated seat 256 is articulated to the top of the support plate through an articulated shaft 257. The lifting driving member 255 is articulated to the bottom of the support plate through a base 254. The lifting driving member 255 is preferably a lifting cylinder. The base 254 is fixed on the top surface of the lifting cylinder, and the piston rod end of the lifting cylinder is articulated to one end of the swing arm 252.

[0043] In order to facilitate limiting the flipping angle of the shaping die 253 and avoid damaging the metal laminate 1, a limiting block 258 is fixed at a position on the top of the support plate of the fixed frame 251 close to the articulated seat 256. The limiting block 258 is provided with a limiting groove with an upward opening, and the swing arm 252 is limited in the limiting groove of the limiting block 258 when pressing down the metal laminate 1.

[0044] Please refer to Figure 10 , the shaping die 253 includes a connecting section 2531 and a die section 2532 that are integrally connected in an L shape. One end of the connecting section 2531 is fixed on the swing arm 252. The extending end of the die section 2532 protrudes downward with a pressing block 2533, and the lower surface of the pressing block 2533 protrudes downward with a shaping block 2534 adapted to the hanging hole 10 of the metal laminate 1. When the pressing block 2533 presses down the end welding part of the flat plate 16 of the metal laminate 1, the shaping block 2534 is embedded in the hanging hole 10 and cooperates with the right-end positioning block 231 for clamping and shaping. In this way, the deformation of the metal laminate 1 during welding can be avoided, and the welding quality can be improved. The die section 2532 is a wedge-shaped block, and the top surface of the wedge-shaped block gradually slopes downward from the fixed end to the extending end.

[0045] Please refer to Figure 4 , the welding robot 3 includes a movable robotic arm 31 and a laser welding head 32 fixed to the free end of the movable robotic arm 31. The movable robotic arm 31 is used to drive the laser welding head 32 to lift, translate and rotate, so that the laser welding head 32 can move to the four-corner welding positions of the metal laminate 1 respectively for welding. Laser welding is an efficient and precise welding method using a laser beam with a high energy density as the heat source, and is suitable for the precision welding of the metal laminate 1.

[0046] The present invention also provides a welding method using the above welding system. The method includes the following steps: placing the metal laminate 1 to be welded in the square positioning space formed by the fixed seat 22 and the sliding seat 23, driving the right-end positioning block 231 of the sliding seat 23 to move a predetermined distance to position the left and right ends of the metal laminate 1. Actuating the front-side pushing positioning assembly 223 to position the front and back sides of the metal laminate 1. Clamping and shaping the side plates 15 of the metal laminate 1 through the flipping and shaping mechanisms 24 oppositely arranged on the fixed seat 22 and the sliding seat 23 and their cooperating rear-side positioning blocks 222 and front-side pushing positioning assembly 223. After pressing and shaping the welding positions at the four corners of the metal laminate 1 by the pressing and shaping mechanism 25, then welding is performed by the welding robot 3. In this way, the welding position can be ensured to be accurate, the welding is firm, it is easy to realize the automated production of a large number of metal laminates 1, which is beneficial to improving production efficiency and production safety and reducing the labor intensity of workers.

[0047] As long as it does not violate the idea of the present invention, any combination of various different embodiments of the present invention shall be regarded as the content disclosed by the present invention; within the scope of the technical concept of the present invention, various simple modifications of the technical solutions and any combination of different embodiments that do not violate the idea of the present invention shall be within the protection scope of the present invention.

Claims

1. A welding system for metal laminated plates, comprising a metal laminated plate positioning device (2) and a welding robot (3), characterized in that, the metal laminated plate positioning device (2) includes a machine base (21), one end of the top surface of the machine base (21) is fixedly provided with a fixed seat (22), and the other end of the top surface of the machine base (21) is slidably provided with a sliding seat (23) that can approach or move away from the fixed seat (22). A left end positioning block (221) is transversely fixed on the top surface of the fixed seat (22), and a right end positioning block (231) is transversely fixed on the top surface of the sliding seat (23). The two left end positioning blocks (221) and the two right end positioning blocks (231) are respectively used to clamp the two ends of the metal laminated plate (1) for positioning. A rear side positioning block (222) and a front side pushing and positioning assembly (223) are longitudinally and oppositely fixed on the top surface of the fixed seat (22). A rear side positioning block (222) and a front side pushing and positioning assembly (223) are also longitudinally and oppositely fixed on the top surface of the sliding seat (23). The left end positioning block (221), the right end positioning block (231), the rear side positioning block (222) and the front side pushing and positioning assembly (223) jointly form a square positioning space. After the metal laminated plate (1) is placed, the sliding seat (23) drives the two right end positioning blocks (231) to move a predetermined distance towards the left end positioning block (221), clamps the left and right ends of the metal laminated plate (1) for positioning, and then the two front side pushing and positioning assemblies (223) push the metal laminated plate (1) to move a predetermined distance towards the rear side positioning block (222) to position the front and rear sides of the metal laminated plate (1). The welding robot (3) is used to weld the metal laminated plate positioned by the metal laminated plate positioning device (2); the fixed seat (22) and the sliding seat (23) are respectively provided with a flipping and shaping mechanism (24) opposite to each other, which is used to cooperate with the rear side positioning block (222) and the front side pushing and positioning assembly (223) to clamp and shape the side plate (15) of the metal laminated plate (1). Two sets of pressing and shaping mechanisms (25) are oppositely arranged on the fixed seat (22), and two sets of pressing and shaping mechanisms (25) are also oppositely arranged on the sliding seat (23), so as to press and shape the welding joints at the four corners of the metal laminated plate (1) and then weld them by the welding robot (3); The front side pushing and positioning assembly (223) includes a telescopic driving part (2231) fixed on the fixed seat (22) and a push plate (2232) fixed on the telescopic end of the telescopic driving part (2231); The flipping and shaping mechanism (24) includes two bearing seats (241) relatively fixed on the sliding seat (23). A flipping shaft (242) is rotatably mounted on the two bearing seats (241) through bearings. A flipping driving member (243) for driving the flipping shaft (242) to reciprocally flip is mounted outside one of the bearing seats (241). A flipping frame (244) is fixedly connected to the flipping shaft (242). One end of the flipping frame (244) is fixed to the flipping shaft (242), and the other end extends radially along the flipping shaft (242). Shaping assemblies (245) are respectively fixed on both sides of the extending end of the flipping frame (244) for cooperatively clamping and shaping the front and rear sides of the metal laminate (1) with the rear positioning block (222) and the front pushing and positioning assembly (223). The pressing and shaping mechanism (25) includes a fixing frame (251). One end of the fixing frame (251) is fixed on the sliding seat (23), and the other end extends outside the fixing frame (251). A swing arm (252) is hinged to the top end of the fixing frame (251). A shaping die (253) for shaping the four corners of the metal laminate (1) is fixed to one end of the swing arm (252). A base (254) extending outside the fixing frame (251) is hinged to the bottom end of the fixing frame (251). A lifting driving member (255) is fixed on the base (254), and the lifting end of the lifting driving member (255) is hinged to the other end of the swing arm (252). The shaping die (253) includes a connecting section (2531) and a die section (2532) integrally connected in an L shape. One end of the connecting section (2531) is fixed to the swing arm (252). A pressing block (2533) protrudes downward from the extending end of the die section (2532), and a shaping block (2534) adapted to the hanging holes (10) of the metal laminate (1) protrudes downward from the lower surface of the pressing block (2533).

2. The welding system for metal laminates according to claim 1, wherein, the shaping assembly (245) includes a shaping driving member (2451) and a shaping block (2452). The shaping driving member (2451) is fixed on the flipping frame (244), and the shaping block (2452) is fixed to the driving end of the shaping driving member (2451).

3. The welding system for metal laminates according to claim 1, wherein, a hinge seat (256) is fixed on the swing arm (252), and the bottom end of the hinge seat (256) is hinged to the top end of the fixing frame (251) through a hinge shaft (257).

4. The welding system for metal laminates according to claim 1, wherein, a limiting block (258) is fixed at a position of the top end of the fixing frame (251) close to the hinge seat (256). A limiting groove with an upward opening is formed on the limiting block (258), and the swing arm (252) is limited in the limiting groove of the limiting block (258) when pressing down the metal laminate (1).

5. The welding system for metal laminates according to claim 1, wherein, The welding robot (3) includes a movable robotic arm (31) and a laser welding head (32) fixed to the free end of the movable robotic arm (31). The movable robotic arm (31) is configured to drive the laser welding head (32) to move up and down, translate, and rotate, so that the laser welding head (32) can be moved to the welding positions at the four corners of the metal laminate (1) for welding respectively.

6. A welding method for the welding system for metal laminates according to any one of claims 1-5, comprising the following steps: placing the metal laminate (1) to be welded within the square positioning space formed by the fixed seat (22) and the sliding seat (23), driving the right-end positioning block (231) of the sliding seat (23) to move a predetermined distance, so that the left and right ends of the metal laminate (1) are positioned, actuating the front-side pushing and positioning assembly (223), so that the front and back sides of the metal laminate (1) are positioned, clamping and shaping the side plates (15) of the metal laminate (1) by the flipping and shaping mechanism (24) and the cooperating rear-side positioning block (222) and the front-side pushing and positioning assembly (223) which are respectively oppositely arranged on the fixed seat (22) and the sliding seat (23), after compacting and shaping the welding positions at the four corners of the metal laminate (1) by the compacting and shaping mechanism (25), then performing welding by the welding robot (3).

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