Vacuum box sealing welding device and welding process

Abstract

The present invention discloses a vacuum box sealing welding device and a welding process, which relate to the technical field of vacuum chamber component welding. It solves the technical problem that the adjustment and fixing process of the existing vacuum box and its cover plate relies on manual operation, which has an adverse effect on the welding effect and can only fix vacuum boxes of specific specifications, greatly reducing the overall efficiency of the welding operation. The device comprises a base, a sealing welding chamber arranged on the base, a welding table arranged in the sealing welding chamber, and a laser welding assembly arranged in the sealing welding chamber. The surface of the welding table is provided with an installation groove. The device also comprises: a fixing seat, which is arranged on the welding table, and angle steel limit seats are provided at the four corners of the surface of the fixing seat. The present invention is applicable to the fixing of vacuum boxes of different specifications, and does not require repeated manual operation to adjust and fix. The offset during the welding operation is effectively avoided, thereby improving the welding effect.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum chamber component welding, and in particular relates to a vacuum box sealing welding device and a welding process. Background Art

[0002] Vacuum chambers are primarily used for degassing powders, colloids, and other materials with high gas content, as well as for vacuum storage of various items, such as electronic and electrical products (semiconductors, circuit boards, electronic components, etc.), chemical raw materials, metallurgical powders, food, medicine, clothing, etc. They effectively prevent oxidation, corrosion, deterioration, and mildew, thereby extending the shelf life and service life of items. They are characterized by easy operation, good airtightness, beautiful appearance, and large storage space.

[0003] Currently, the existing technology relies on manual adjustment and fixation of the vacuum chamber and cover plate, which inevitably negatively impacts welding results when using a laser welding head for cover plate welding. Furthermore, the existing fixtures must be replaced entirely for different vacuum chamber and cover plate models. This cumbersome replacement process increases the complexity of the operation and significantly reduces overall welding efficiency.

[0004] Therefore, based on the above problems, we designed a vacuum box sealing welding device and welding process. Summary of the Invention

[0005] The present invention aims to address at least one of the technical problems existing in the prior art. To this end, the present invention provides a vacuum chamber sealing welding device and welding process. This device and welding process address the existing problem of manual adjustment and fixing of the vacuum chamber and its cover, which inevitably adversely affects the welding results when using a laser welding head to weld the cover. Furthermore, the existing fixing fixtures need to be replaced entirely for different vacuum chamber and cover models. This cumbersome replacement process increases the complexity of the operation and significantly reduces the overall efficiency of the welding operation.

[0006] To achieve the above-mentioned object, according to an embodiment of a first aspect of the present invention, a vacuum chamber sealing welding device is provided, comprising a base, a sealing welding chamber disposed on the base, a welding table disposed in the sealing welding chamber, and a laser welding assembly disposed in the sealing welding chamber;

[0007] Wherein, a mounting groove is provided on the surface of the welding table;

[0008] Also includes:

[0009] The fixed seat is arranged on the welding table, and angle steel limit seats are arranged at the four corners of the surface of the fixed seat. An angle steel clamping sleeve is arranged on the inner wall surface of each angle steel limit seat. The welding table is vertically provided with mounting rods on both sides of the fixed seat, and a ball screw is rotatably arranged in each mounting rod. A lifting seat is threaded on each ball screw, and special-shaped pressure frames are arranged in the ports of the four angle steel limit seats, and the two sides of the special-shaped pressure frames are respectively arranged on two ball screws.

[0010] A further improvement is that a rotating wheel is provided on each side of the interior of the welding table, the rotating shaft of each rotating wheel is connected to each ball screw, the two rotating wheels are connected by a belt, and a servo motor 2 is provided inside the welding table, and the main shaft of the servo motor 2 is connected to the rotating wheel.

[0011] A further improvement is that the special-shaped pressure frame is divided into a pair of mounting rods and a square frame connected to the inner sides of the pair of mounting rods, a fixing screw is provided at the end of each mounting rod, and each mounting rod is installed on the lifting seat through the fixing screw.

[0012] A further improvement is that the laser welding assembly includes a hydraulic lifting cylinder arranged on the top surface of the sealed welding chamber, a frame arranged in the sealed welding chamber and connected to the rod body of the hydraulic lifting cylinder, a pair of electric guide rails symmetrically arranged on the inner wall of the frame, a moving rod arranged on the pair of electric guide rails and a laser welding head arranged at both ends of the moving rod.

[0013] A further improvement is that a limit rod is provided in each of the mounting machine rods, each lifting seat is movably sleeved on the limit rod, and the inner wall surface of the angle steel limit seat is provided with a slot, and the angle steel ferrule is inserted into the slot.

[0014] A further improvement is that it also includes a steering adjustment disk, a mounting groove is provided on the surface of the welding table, the steering adjustment disk is rotatably set in the mounting groove, the fixed seat is connected to the steering adjustment disk, and a gear ring is connected at the edge of the surface of the steering adjustment disk, the teeth of the gear ring are located on the upper end face, a stepper motor is provided on the welding table, the main shaft of the stepper motor is connected to a power gear that meshes with the teeth of the gear ring, threaded grooves are provided at the four corners of the steering adjustment disk, and a threaded joint is provided on the bottom surface of each angle steel limit seat, and each of the angle steel limit seats is connected to the steering adjustment disk through a threaded joint.

[0015] A further improvement is that it also includes a vacuum component, which includes a vacuum pump and a pressure gas storage tank arranged outside the sealed welding chamber, an air path one connected to the output end of the vacuum pump and the other end of which penetrates into the sealed welding chamber, and an air path two connected to the pressure gas storage tank and the other end of which penetrates into the sealed welding chamber.

[0016] A further improvement is that the gas circuit 1 is connected to a vacuum pressure gauge and a first electromagnetic control valve, and the gas circuit 2 is connected to a second electromagnetic control valve.

[0017] A welding process for a vacuum box sealing welding device comprises the following steps:

[0018] Step 1: Select and insert a set of angle steel ferrules into the slots on the inner wall of the angle steel limit seat, then clamp the cover plate at the corresponding position of the vacuum box that needs to be welded, and then connect the pair of mounting rods in the special-shaped pressing frame to the inner wall of the pair of lifting seats respectively. By starting the servo motor 2, the servo motor 2 drives the pair of rotating wheels and the ball screw to rotate, so that the pair of lifting seats and the special-shaped pressing frame move downward under the action of the ball screw, so that the square frame presses on the edge of the cover plate and automatically fixes the cover plate;

[0019] Step 2: Start the vacuum pump and open the electromagnetic control valve 1 to use the vacuum pump to extract the air from the sealed welding chamber. Then connect the laser welding head to the external welding equipment, use the hydraulic lifting cylinder to drive the laser welding assembly to rise and fall, and use a set of electric guide rails to drive the moving rod and a pair of laser welding heads to move left and right. Under the vacuum environment, the laser welding head welds the corresponding connection gaps between the cover plate and the vacuum box.

[0020] Step 3: Repeat the first step, use a pair of ball screws to drive the special-shaped pressure frame to increase its height, and then use the main shaft of the stepper motor to drive the power gear, gear ring and steering adjustment plate to rotate synchronously, and swap the positions of a set of angle steel limit seats together with the vacuum box and the cover plate. Drive the square frame in the special-shaped pressure frame to continue to press on the edge of the cover plate to automatically fix the cover plate again, and then repeat the second step for welding.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention inserts a group of angle steel ferrules into the slots on the inner wall of the angle steel limiting seat, which makes it easy to insert vacuum boxes of different specifications into the group of angle steel ferrules and fix them. Then, the cover plate is correspondingly clamped at the position of the vacuum box that needs to be welded, and then a pair of mounting rods in the special-shaped pressing frame are respectively connected to the inner wall surfaces of the pair of lifting seats. Then, by starting the servo motor 2, the servo motor 2 drives the pair of rotating wheels and the ball screw to rotate, so that the pair of lifting seats and the special-shaped pressing frame move downward under the action of the ball screw, so that the square frame is pressed on the edge of the cover plate, and the cover plate can be automatically fixed without manual repeated operation of adjustment and fixation, effectively avoiding deviation during welding operation, thereby improving the welding effect.

[0023] The present invention drives the special-shaped pressing frame to rise in height through a ball screw, and then uses the main shaft of the stepping motor to drive the power gear, the gear ring and the steering adjustment disk to rotate synchronously according to the set speed and time, so as to swap the positions of a set of angle steel limit seats together with the vacuum box and the cover plate, and drive the square frame in the special-shaped pressing frame to continue to be pressed on the edge of the cover plate, thereby facilitating re-sealing and welding without the need to loosen it for position adjustment, thereby avoiding positioning deviation caused by taking and replacing. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the top view of the welding table and the steering adjustment disk of the present invention;

[0027] Figure 4 This is a schematic diagram of the side structure of the laser welding assembly of the present invention;

[0028] Figure 5 This is a schematic diagram of the top view of the special-shaped pressing frame and a pair of lifting seats of the present invention;

[0029] Figure 6 It is a schematic diagram of the partial structure of a single angle steel limiting seat and a fixing seat of the present invention.

[0030] Markings in the figure:

[0031] 1. Base;

[0032] 2. Sealed welding chamber; 21. Chamber door; 22. Hydraulic lift cylinder; 23. Mounting slot; 24. Laser welding assembly; 241. Laser welding head; 242. Frame; 243. Electric guide rail; 244. Moving rod;

[0033] 3. Fixed seat; 31. Angle steel limit seat; 311. Angle steel sleeve; 312. Slot; 32. Mounting rod; 33. Ball screw; 331. Lifting seat; 34. Special-shaped pressing frame; 341. Mounting rod; 342. Square frame; 35. Rotating wheel; 36. Limit rod; 37. Servo motor 2;

[0034] 4. Vacuum assembly; 41. Vacuum pump; 42. Pressure gas storage tank; 43. Gas line 1; 44. Gas line 2; 45. Vacuum pressure gauge; 46. Solenoid control valve 1; 47. Solenoid control valve 2;

[0035] 5. Welding table; 51. Steering adjustment plate; 511. Thread groove; 512. Threaded joint; 52. Ring gear; 53. Stepper motor; 54. Power gear. DETAILED DESCRIPTION

[0036] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] like Figure 1 and Figure 4 As shown, a vacuum box sealing welding device includes a base 1, a sealing welding chamber 2 arranged on the base 1, a welding table 5 arranged in the sealing welding chamber 2, and a laser welding assembly 24 arranged in the sealing welding chamber 2;

[0038] The surface of the welding table 5 is provided with a mounting groove 23. The laser welding assembly 24 includes a hydraulic lift cylinder 22 disposed on the top surface of the sealed welding chamber 2, a frame 242 disposed within the sealed welding chamber 2 and connected to the rod of the hydraulic lift cylinder 22, a pair of electric guide rails 243 symmetrically disposed on the inner wall of the frame 242, a moving rod 244 disposed on the pair of electric guide rails 243, and laser welding heads 241 disposed at both ends of the moving rod 244.

[0039] like Figure 2 、 Figure 3 and Figure 5 As shown, the implementation includes: a fixed seat 3, which is arranged on the welding table 5, and angle steel limiting seats 31 are provided at the four corners of the surface of the fixed seat 3, and an angle steel clamping sleeve 311 is provided on the inner wall surface of each angle steel limiting seat 31. The welding table 5 is vertically provided with mounting rods 32 on both sides of the fixed seat 3, and a ball screw 33 is rotatably provided in each mounting rod 32. A lifting seat 331 is threaded on each ball screw 33, and a special-shaped pressing frame 34 is provided in the port of the four angle steel limiting seats 31. The two sides of the special-shaped pressing frame 34 are respectively provided on two ball screws 33. By inserting a group of angle steel clamping sleeves 311 into the inner wall slots 312 of the angle steel limiting seat 31, it will be convenient to insert vacuum boxes of different specifications into a group of angle steel clamping sleeves 311 and fix them;

[0040] Specifically, a limiting rod 36 is provided in each mounting rod 32, a slot 312 is provided on the inner wall surface of the angle steel limiting seat 31, the angle steel sleeve 311 is inserted into the slot 312, and each lifting seat 331 is movably sleeved on the limiting rod 36. A rotating wheel 35 is provided on each side of the interior of the welding table 5. The rotating shaft of each rotating wheel 35 is connected to each ball screw 33. The two rotating wheels 35 are connected by a belt. A servo motor 2 37 is provided inside the welding table 5. The main shaft of the servo motor 2 37 is connected to the rotating wheel 35. The special-shaped pressing frame 34 is divided into a pair of mounting rods 341 and a pair of mounting rods 341 connected thereto. The square frame 342 on the side is provided with a fixing screw 343 at the end of each mounting rod 341. Each mounting rod 341 is mounted on the lifting seat 331 via the fixing screw 343. By starting the servo motor 37, the servo motor 37 drives the pair of rotating wheels 35 and the ball screw 33 to rotate, so that the pair of lifting seats 331 and the special-shaped pressing frame 34 move downward under the action of the ball screw 33, so that the square frame 342 presses on the edge of the cover plate, which can automatically fix the cover plate without manual repeated adjustment and fixation, effectively avoiding deviation during welding operation, thereby improving the welding effect.

[0041] like Figure 2 、 Figure 3 and Figure 6 As shown, the implementation includes: a steering adjustment disk 51, which is rotatably arranged in the mounting groove 23, the fixing seat 3 is connected to the steering adjustment disk 51, and a gear ring 52 is connected to the surface edge of the steering adjustment disk 51. The teeth of the gear ring 52 are located on the upper end surface. A stepping motor 53 is provided on the welding table 5, and the main shaft of the stepping motor 53 is connected to a power gear 54 that meshes with the teeth of the gear ring 52. The special-shaped pressing frame 34 is driven to rise in height through a pair of ball screws 33, and then the main shaft of the stepping motor 53 is used to drive the power gear 54, the gear ring 52 and the steering adjustment disk 51 to rotate synchronously according to the set speed and time, so as to exchange the position of a group of angle steel limit seats 31 together with the vacuum box and the cover plate, and the square frame 342 in the driving special-shaped pressing frame 34 continues to press on the edge of the cover plate, thereby facilitating re-sealing and welding, without the need to loosen for position adjustment, and avoiding positioning deviation caused by taking and replacing;

[0042] Specifically, thread grooves 511 are provided at the four corners of the steering adjustment disk 51, and a threaded joint 512 is provided on the bottom surface of each angle steel limit seat 31. Each of the angle steel limit seats 31 is connected to the steering adjustment disk 51 through the threaded joint 512, so that each angle steel limit seat 31 can be easily disassembled and assembled.

[0043] like Figure 4As shown, in this embodiment, a vacuum assembly 4 is further included, which includes a vacuum pump 41 and a pressure gas storage tank 42 arranged outside the sealing welding chamber 2, a gas path 1 43 connected to the output end of the vacuum pump 41 and the other end of which penetrates into the sealing welding chamber 2, and a gas path 2 44 connected to the pressure gas storage tank 42 and the other end of which penetrates into the sealing welding chamber 2;

[0044] Specifically, the gas line 1 43 is connected to a vacuum pressure gauge 45 and an electromagnetic control valve 1 46 , and the gas line 2 44 is connected to an electromagnetic control valve 2 47 .

[0045] like Figures 1 to 6 As shown, in this embodiment, it should also be noted that the application document is configured with a PLC control box arranged outside the sealed welding chamber 2 before implementation, and a control system is pre-implanted on the control panel inside the PLC control box for controlling the electronic components and equipment in this application; the sealed welding chamber 2 in the application document is provided with a chamber door 21, and a sealing strip is provided on the chamber door 21. It should be noted that the control principle of the PLC control box is a prior art, and the working principle has been disclosed. This application document only relies on manual operation for the adjustment and fixing process of the existing vacuum box and its cover. This method will inevitably have an adverse effect on the welding effect when the laser welding head 241 is used for cover welding operations. In addition, for different models of vacuum boxes and cover plates, the existing fixing fixture needs to be replaced as a whole. This cumbersome replacement process increases the complexity of the operating process, thereby greatly reducing the overall efficiency of the welding operation. Improvements are made to the shortcomings, and no other aspects are involved. The following is an introduction to the welding process of a vacuum box sealed welding device:

[0046] When installing and using:

[0047] The first step: the on-site staff selects a set of angle steel clips 311 to be inserted into the inner wall slots 312 of the angle steel limit seat 31 according to the size of the vacuum box, so that vacuum boxes of different specifications can be inserted into a set of angle steel clips 311 and fixed. Then the cover plate is clamped at the position of the vacuum box that needs to be welded, and then the pair of mounting rods 341 in the special-shaped pressing frame 34 are respectively connected to the inner wall surfaces of the pair of lifting seats 331. Then, by starting the servo motor 2 37, the servo motor 2 37 drives the pair of rotating wheels 35 and the ball screw 33 to rotate, so that the pair of lifting seats 331 and the special-shaped pressing frame 34 move downward under the action of the ball screw 33, so that the square frame 342 is pressed on the edge of the cover plate, which can automatically fix the cover plate without manual repeated adjustment and fixation, effectively avoiding deviation during welding operation, thereby improving the welding effect;

[0048] Step 2: Start the vacuum pump 41 and open the electromagnetic control valve 46. Use the vacuum pump 41 to evacuate the air from the sealed welding chamber 2 until the vacuum level required by the process is reached. At this time, the vacuum pressure is monitored using the vacuum pressure gauge 45. Then, connect the laser welding head 241 to the external welding equipment, drive the laser welding assembly 24 to move up and down via the hydraulic lifting cylinder 22, and drive the moving rod 244 and the pair of laser welding heads 241 to move left and right via a set of electric guide rails 243. The laser welding head 241 welds the corresponding connection gaps between the cover plate and the vacuum chamber under the vacuum environment.

[0049] During the welding process, the welding parameters of the external welding equipment, such as current, voltage, welding speed, etc., are controlled to ensure the quality of the weld. During welding, the electromagnetic control valve 2 47 on the gas line 2 44 of the pressure gas storage tank 42 is opened to allow high-purity shielding gas (such as argon) to prevent the weld from being oxidized or contaminated. At the same time, the flow rate and flow rate of the shielding gas must also be strictly controlled to ensure the welding effect;

[0050] Step 3: By repeating the first step, the special-shaped pressing frame 34 is driven to rise in height through a pair of ball screws 33, and then the main shaft of the stepper motor 53 is used to drive the power gear 54, the ring gear 52 and the steering adjustment disk 51 to rotate synchronously according to the set rate and time, and a set of angle steel limit seats 31 together with the vacuum box and the cover are swapped, and the square frame 342 in the special-shaped pressing frame 34 is driven to continue to press on the edge of the cover, so as to facilitate re-sealing and welding, without the need to loosen for position adjustment, and avoid positioning deviation caused by taking and replacing.

[0051] The above embodiments are only used to illustrate the technical method of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A vacuum box sealing welding device, comprising a base (1), a sealing welding chamber (2) arranged on the base (1), a welding table (5) arranged in the sealing welding chamber (2), and a laser welding assembly (24); It is characterized in that Also includes: A fixed seat (3) is arranged on a welding table (5); angle steel limit seats (31) are arranged at the four corners of the surface of the fixed seat (3); an angle steel clamping sleeve (311) is arranged on the inner wall surface of each angle steel limit seat (31); the welding table (5) is vertically provided with mounting rods (32) on both sides of the fixed seat (3); a ball screw (33) is rotatably arranged in each mounting rod (32); a lifting seat (331) is threadedly sleeved on each ball screw (33); special-shaped pressure frames (34) are arranged in the ports of the four angle steel limit seats (31); and the two sides of the special-shaped pressure frames (34) are respectively arranged on two lifting seats (331); A rotating wheel (35) is rotatably provided on both sides of the interior of the welding table (5), the rotating shaft of each rotating wheel (35) is connected to each ball screw (33), and the two rotating wheels (35) are connected by a belt. A servo motor 2 (37) is provided inside the welding table (5), and the main shaft of the servo motor 2 (37) is connected to the rotating wheel (35); The special-shaped pressing frame (34) is divided into a pair of mounting rods (341) and a square frame (342) connected to the inner side of the pair of mounting rods (341). A fixing screw (343) is provided at the end of each mounting rod (341). Each mounting rod (341) is mounted on the lifting seat (331) through the fixing screw (343). The laser welding assembly (24) comprises a hydraulic lifting cylinder (22) arranged on the top surface of the sealed welding chamber (2), a frame (242) arranged in the sealed welding chamber (2) and connected to the rod body of the hydraulic lifting cylinder (22), a pair of electric guide rails (243) symmetrically arranged on the inner wall of the frame (242), a moving rod (244) arranged on the pair of electric guide rails (243), and laser welding heads (241) arranged at both ends of the moving rod (244); The invention also includes a steering adjustment disk (51), a mounting groove (23) is provided on the surface of the welding platform (5), the steering adjustment disk (51) is rotatably arranged in the mounting groove (23), the fixing seat (3) is connected to the steering adjustment disk (51), a gear ring (52) is connected to the edge of the surface of the steering adjustment disk (51), the teeth of the gear ring (52) are located on the upper end surface, a stepping motor (53) is provided on the welding platform (5), and the main shaft of the stepping motor (53) is connected to a power gear (54) meshing with the teeth of the gear ring (52), the four corners of the steering adjustment disk (51) are provided with threaded grooves (511), the bottom surface of each angle steel limiting seat (31) is provided with a threaded joint (512), and each angle steel limiting seat (31) is connected to the steering adjustment disk (51) through the threaded joint (512).

2. A vacuum box sealing welding device according to claim 1, characterized in that: A limiting rod (36) is provided in each of the mounting machine rods (32), and each lifting seat (331) is movably sleeved on the limiting rod (36). The inner wall surface of the angle steel limiting seat (31) is provided with a slot (312), and the angle steel clamping sleeve (311) is inserted into the slot (312).

3. A vacuum box sealing welding device according to claim 2, characterized in that: The invention also includes a vacuum assembly (4), which includes a vacuum pump (41) and a pressure gas storage tank (42) arranged outside the sealed welding chamber (2), a gas path 1 (43) connected to the output end of the vacuum pump (41) and the other end of which penetrates into the sealed welding chamber (2), and a gas path 2 (44) connected to the pressure gas storage tank (42) and the other end of which penetrates into the sealed welding chamber (2).

4. A vacuum box sealing welding device according to claim 3, characterized in that: The gas circuit 1 (43) is connected to a vacuum pressure gauge (45) and an electromagnetic control valve 1 (46), and the gas circuit 2 (44) is connected to an electromagnetic control valve 2 (47).

5. The welding process of the vacuum box sealing welding device according to claim 4, characterized in that: The steps include: The first step is to select and insert a set of angle steel ferrules (311) into the inner wall slots (312) of the angle steel limit seat (31), and then clamp the cover plate at the position of the vacuum box that needs to be welded, and then respectively connect a pair of mounting rods (341) in the special-shaped pressure frame (34) to the inner wall surfaces of a pair of lifting seats (331), and start the servo motor 2 (37), and use the servo motor 2 (37) to drive a pair of rotating wheels (35) and a ball screw (33) to rotate, so that the pair of lifting seats (331) and the special-shaped pressure frame (34) move downward under the action of the ball screw (33), so that the square frame (342) presses on the edge of the cover plate to automatically fix the cover plate; Step 2: Start the vacuum pump (41) and open the electromagnetic control valve (46), and use the vacuum pump (41) to extract the air in the sealed welding chamber (2); then connect the laser welding head (241) to the external welding equipment, drive the laser welding assembly (24) to move up and down through the hydraulic lifting cylinder (22), and drive the moving rod (244) and a pair of laser welding heads (241) to move left and right through a set of electric guide rails (243), so that the laser welding head (241) can weld a set of connecting gaps between the cover plate and the vacuum box in a vacuum environment; The third step: by repeating the first step, the height of the special-shaped pressing frame (34) is raised by a pair of ball screws (33), and then the main shaft of the stepping motor (53) is used to drive the power gear (54), the ring gear (52) and the steering adjustment plate (51) to rotate synchronously, and a set of angle steel limit seats (31) together with the vacuum box and the cover plate are exchanged. The square frame (342) in the special-shaped pressing frame (34) is driven to continue to press on the edge of the cover plate to automatically fix the cover plate again, and then the second step is repeated for welding.

Images