Metal plate welding device for safety door production

Abstract

The invention relates to the technical field of safety door production, in particular to a metal plate welding device for safety door production, which comprises a rack, a mounting box, two mounting frames, two vertical electric guide rails and a lifting plate, the top of the rack is connected with the mounting box, the top of the mounting box is connected with the two mounting frames, and the top of the mounting box is provided with the two vertical electric guide rails; the vertical electric guide rails are connected with the mounting frame, and a lifting plate is connected between sliding blocks of the two vertical electric guide rails. A gap in the top of a door frame is welded through a first laser welding head, a gap in the door frame is welded through a second laser welding head, a gap outside the door frame is welded through a third laser welding head, and a gear can be driven to rotate through a rack, so that the door frame is driven to rotate, and the door frame is automatically turned over; manual intervention is reduced, the workload of workers is relieved, and the production efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of safety door production, and in particular to a metal plate welding device for safety door production. Background Art

[0002] With the continuous improvement of building safety standards, the market demand for high-quality, high-performance safety doors is increasing. Safety doors are composed of door frames and door panels, and the door frames are composed of four metal plates, which are connected by welding.

[0003] When producing safety doors, four metal plates are generally placed on a bracket and arranged into a door frame shape. The door frame is then fixed by fixings, and the laser welding head is driven to move by a robotic arm so that the laser welding head can weld the gap in the door frame. The door frame is placed on the bracket, and the bottom of the door frame is in contact with the bracket. Therefore, the laser welding head can only weld the gaps at the top, outside and inside of the door frame. The door frame needs to be turned over to weld the gap at the bottom of the door frame. The metal plate is heavy, and manual turning is difficult, which will increase the workload of the staff and thus affect production efficiency. Summary of the invention

[0004] In order to overcome the shortcomings that metal plates are heavy, manual turning is difficult, the workload of workers is large, and production efficiency is affected, the present invention provides a metal plate welding device for safety door production.

[0005] The present invention adopts the following technical scheme: a metal plate welding device for safety door production, comprising a frame, an installation box, a mounting frame, a vertical electric guide rail, a lifting plate, a connecting plate, an inclined electric guide rail, a first laser welding head, a connecting block, a first electric push rod, a second laser welding head, a second electric push rod, a third laser welding head, a rotating shaft, a placing plate, a flipping mechanism and a limiting mechanism, the frame is connected to the top of the frame, the top of the installation box is connected to two mounting frames, the top of the installation box is equipped with two vertical electric guide rails, the vertical electric guide rails and the mounting frame are connected, a lifting plate is connected between the sliders of the two vertical electric guide rails, the bottom of the lifting plate is connected to two connecting plates, the connecting plates are each connected to two inclined electric guide rails, the sliding A first laser welding head is installed at the bottom of each block, a connecting block is connected to the first laser welding head, a first electric push rod and a second electric push rod are connected to the connecting block, the telescopic rod of the first electric push rod is connected to a second laser welding head, and the telescopic rod of the second electric push rod is connected to a third laser welding head. Rotating shafts are rotatably connected on the left and right sides of the installation box, and a placement plate is connected between the two rotation shafts. Four metal plates are placed on the placement plate and arranged into a door frame shape. The first laser welding head, the second laser welding head and the third laser welding head weld the gap on the door frame. A turning mechanism for turning over the door frame is provided on the lifting plate, and a limiting mechanism for limiting the door frame is provided on the placement plate.

[0006] Furthermore, the flipping mechanism includes a circular plate, a rack and a gear. Two circular plates are connected to the bottom of the lifting plate. The circular plates are connected to racks. The rotating shafts are connected to gears through one-way clutches. The racks will mesh with the gears during the upward movement.

[0007] Furthermore, the limiting mechanism includes a third electric push rod, a first limiting plate, a mounting plate, a fourth electric push rod, a movable plate, a second limiting plate and a fifth electric push rod, two third electric push rods are connected to the left and right sides of the top of the placement plate, the telescopic rods of the two third electric push rods on the left side are commonly connected to the first limiting plate, and the telescopic rods of the two third electric push rods on the right side are also commonly connected to the first limiting plate, the first limiting plate is used to limit the door frame, and the sides of the upper parts of the two first limiting plates close to each other are provided with a supporting part for supporting the door frame, the bottom of the placement plate is connected to the mounting plate, the mounting plate is connected to the fourth electric push rod, the telescopic rod of the fourth electric push rod is connected to the movable plate, the front and rear sides of the movable plate are slidably connected to the second limiting plates, the bottom of the movable plate is connected to two fifth electric push rods, the telescopic rod of the fifth electric push rod is connected to the second limiting plate, and the telescopic rod of the fifth electric push rod can drive the two second limiting plates to move in a direction close to each other, so that the second limiting plates limit the door frame.

[0008] Furthermore, it also includes a supporting mechanism, which includes a guide frame, an insert plate, a spring, an inclined plate and a pressure rod. The left and right sides of the installation box are connected to the guide frames, the insert plates are slidably connected in the guide frames, springs are connected between the insert plates and the guide frames, the insert plates are connected to the inclined plates, the circular plates are connected to the pressure rods, the left and right sides of the placement plate are provided with slots, the pressure rods are used to press the inclined plates so that the insert plates are inserted into the slots to support the placement plate.

[0009] Furthermore, it also includes an injection mechanism, which includes an air outlet pipe, a nozzle and an air guide pipe. Two air outlet pipes are connected to the connecting plate, and the air outlet pipes are connected to the nozzles for spraying carbon dioxide onto the welding points of the door frame. The upper ends of the two air outlet pipes on the same connecting plate are commonly connected to the air guide pipe.

[0010] Furthermore, a discharge mechanism is also included, which includes a cylinder and a push plate. The top of the installation box is connected to the cylinder, and the telescopic rod of the cylinder is connected to the push plate.

[0011] Furthermore, it also includes a guide sleeve, and the vertical electric guide rails are all connected with the guide sleeve for guiding the circular plate, the circular plate is located in the guide sleeve, and the circular plate and the guide sleeve are slidably connected.

[0012] Furthermore, notches are provided at the four corners of the placement plate.

[0013] Furthermore, both the front and rear sides of the placement plate are provided with accommodating grooves for accommodating the second limiting plate.

[0014] The present invention has the following beneficial effects: 1. The present invention can weld the gap on the top of the door frame through the first laser welding head, weld the gap inside the door frame through the second laser welding head, and weld the gap outside the door frame through the third laser welding head. The gear can be driven to rotate through the rack, thereby driving the door frame to rotate and automatically flipping the door frame, thereby reducing manual intervention, alleviating the workload of staff, and improving production efficiency.

[0015] 2. The insert plate can support the placement plate to improve the stability of the placement plate. When the circular plate moves upward, it will drive the pressure rod to move upward, so that the insert plate is moved out of the slot, the placement plate is released, and the placement plate can rotate normally.

[0016] 3. Carbon dioxide can be sprayed onto the welding part of the door frame through the nozzle to promote metal evaporation during welding and improve welding stability.

[0017] 4. The extension of the telescopic rod of the cylinder can drive the push plate to move forward. The push plate can push out the welded door frame to facilitate unloading by the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1A three-dimensional structural schematic diagram of the present invention is shown.

[0019] Figure 2 A three-dimensional structural schematic diagram of the inclined electric guide rail, the first laser welding head, the second laser welding head and the third laser welding head of the present invention is shown.

[0020] Figure 3 A three-dimensional structural schematic diagram of the connecting block, the first electric push rod and the second electric push rod of the present invention is shown.

[0021] Figure 4 A three-dimensional structural schematic diagram of the rotating shaft and the placement plate of the present invention is shown.

[0022] Figure 5 A first three-dimensional structural schematic diagram of the turning mechanism of the present invention is shown.

[0023] Figure 6 A second three-dimensional structural schematic diagram of the turning mechanism of the present invention is shown.

[0024] Figure 7 A three-dimensional structural schematic diagram of the limiting mechanism of the present invention is shown.

[0025] Figure 8 A schematic diagram of the three-dimensional structure of the first limiting plate and the supporting part of the present invention is shown.

[0026] Fig. 9 A three-dimensional structural schematic diagram of the mounting plate, the fourth electric push rod and the moving plate of the present invention is shown.

[0027] Fig.10 A three-dimensional structural schematic diagram of the movable plate, the second limiting plate and the fifth electric push rod of the present invention is shown.

[0028] Fig.11 A first three-dimensional structural schematic diagram of the support mechanism of the present invention is shown.

[0029] Fig.12 A second three-dimensional structural schematic diagram of the support mechanism of the present invention is shown.

[0030] Fig.13 A three-dimensional structural schematic diagram of the slot of the present invention is shown.

[0031] Fig.14 The three-dimensional structural schematic diagram of the jet mechanism of the present invention is shown.

[0032] Fig.15 The three-dimensional structural schematic diagram of the unloading mechanism of the present invention is shown.

[0033] Figure numbers: 1-frame, 2-installation box, 3-installation frame, 4-vertical electric guide rail, 5-lifting plate, 6-connecting plate, 7-inclined electric guide rail, 8-first laser welding head, 9-connecting block, 10-first electric push rod, 11-second laser welding head, 12-second electric push rod, 13-third laser welding head, 131-rotating shaft, 132-placing plate, 14-reciprocating plate, 15-rack, 16-gear, 1 7-the third electric push rod, 18-the first limiting plate, 181-the supporting part, 19-the mounting plate, 20-the fourth electric push rod, 21-the moving plate, 22-the second limiting plate, 23-the fifth electric push rod, 24-the guide frame, 25-the plug plate, 26-the spring, 27-the inclined plate, 28-the pressure rod, 29-the slot, 30-the air outlet pipe, 31-the nozzle, 32-the air guide pipe, 33-the cylinder, 34-the push plate, 35-the guide sleeve. DETAILED DESCRIPTION

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0035] Example 1: Figure 1-Figure 10As shown, a metal plate welding device for safety door production includes a frame 1, an installation box 2, a mounting frame 3, a vertical electric guide rail 4, a lifting plate 5, a connecting plate 6, an inclined electric guide rail 7, a first laser welding head 8, a connecting block 9, a first electric push rod 10, a second laser welding head 11, a second electric push rod 12, a third laser welding head 13, a rotating shaft 131, a placement plate 132, a flipping mechanism and a limiting mechanism. The top of the frame 1 is connected to the installation box 2 by bolts, and the left and right sides of the top of the installation box 2 are connected to the mounting frame 3 by bolts. The left and right sides of the top of the installation box 2 are installed with vertical electric Guide rail 4, the top of vertical electric guide rail 4 is connected with mounting frame 3, a lifting plate 5 is connected between the sliders of two vertical electric guide rails 4 by bolts, the left and right sides of the bottom of lifting plate 5 are connected with connecting plates 6 by bolts, the front and rear sides of the bottom of connecting plate 6 are connected with tilting electric guide rail 7, the bottom of the slider of tilting electric guide rail 7 is installed with first laser welding head 8, the upper part of first laser welding head 8 is connected with connecting block 9, the bottom of four connecting blocks 9 is connected with first electric push rod 10 on the side close to each other, the lower end of telescopic rod of first electric push rod 10 is connected with second laser welding head 11, four connecting blocks 9 are connected with first electric push rod 10, the lower end of telescopic rod of four connecting blocks 9 is connected with second laser welding head 11, the lower end of telescopic rod of four connecting blocks 9 is connected with second laser welding head 11, the lower end of telescopic rod of four connecting blocks 9 is connected with second laser welding head 11, the lower end of telescopic rod of four connecting blocks 9 is connected with second laser welding head 11, the lower end of telescopic rod of four connecting blocks 9 is connected with first electric push rod 10 ... The second electric push rod 12 is connected to the side away from each other at the bottom of the connecting block 9, and the lower end of the telescopic rod of the second electric push rod 12 is connected to the third laser welding head 13. The left and right sides of the middle part of the installation box 2 are rotatably connected with the rotating shaft 131, and a placement plate 132 is connected between the two rotating shafts 131. The lower ends of the second laser welding head 11 and the third laser welding head 13 are higher than the lower end of the first laser welding head 8. Therefore, when the first laser welding head 8 is welding the gap at the bottom of the door frame, the second laser welding head 11 and the third laser welding head 13 will not touch the placement plate 132, and the four sides of the placement plate 132 Notches are provided at the corners so that the gap at the bottom of the door frame can be exposed. Therefore, when the first laser welding head 8 welds the gap at the bottom of the door frame, the first laser welding head 8 will not touch the placement plate 132. The inclination angle of the inclined electric guide rail 7 is consistent with the inclination angle of the gap at the top of the door frame, so that the first laser welding head 8 can move along the gap at the top of the door frame, so that the first laser welding head 8 can smoothly weld the gap at the top of the door frame. The lifting plate 5 is provided with a flipping mechanism for flipping the door frame, and the placement plate 132 is provided with a limiting mechanism for limiting the door frame.

[0036] like Figure 5 and Figure 6 As shown, the flipping mechanism includes a circular plate 14, a rack 15 and a gear 16. The left and right sides of the bottom of the lifting plate 5 are connected to the circular plate 14 by bolts, the inner front side of the circular plate 14 is connected to the rack 15, and the rotating shaft 131 is connected to the gear 16 through a one-way clutch. The rack 15 will mesh with the gear 16 during the upward movement.

[0037] like Figure 7-10As shown, the limiting mechanism includes a third electric push rod 17, a first limiting plate 18, a mounting plate 19, a fourth electric push rod 20, a moving plate 21, a second limiting plate 22 and a fifth electric push rod 23. The left and right sides of the top of the placement plate 132 are symmetrically connected to the third electric push rods 17 front and back, the telescopic rods of the two third electric push rods 17 on the left are commonly connected to the first limiting plate 18, and the telescopic rods of the two third electric push rods 17 on the right are also commonly connected to the first limiting plate 18. The upper sides of the two first limiting plates 18 that are close to each other are provided with supporting parts 181. When the door frame is turned over, the supporting parts 181 of the first limiting plates 18 can hold the door frame to avoid The door frame falls downward, and the middle of the bottom of the placement plate 132 is connected to the mounting plate 19 by bolts, the middle of the mounting plate 19 is connected to the fourth electric push rod 20, the upper end of the telescopic rod of the fourth electric push rod 20 is connected to the movable plate 21, the front and rear sides of the movable plate 21 are slidably connected to the second limit plate 22, the front and rear sides of the middle of the placement plate 132 are provided with accommodating grooves for accommodating the second limit plate 22, the front and rear sides of the bottom of the movable plate 21 are symmetrically connected with the fifth electric push rod 23, the telescopic rods of the two fifth electric push rods 23 on the front side are connected to the bottom of the second limit plate 22 on the front side, and the telescopic rods of the two fifth electric push rods 23 on the rear side are connected to the bottom of the second limit plate 22 on the rear side.

[0038] like Figure 5 As shown, a guide sleeve 35 is also included. The two sides of the two vertical electric guide rails 4 that are close to each other are connected with the guide sleeve 35. The circular plate 14 is located in the guide sleeve 35, and the circular plate 14 and the guide sleeve 35 are slidably connected.

[0039] Initially, the telescopic rod of the third electric push rod 17 and the telescopic rod of the fifth electric push rod 23 are both in an extended state; the staff puts four metal plates on the placement plate 132, and puts the four metal plates into a door frame shape, controls the telescopic rod of the third electric push rod 17 to shorten, drives the two first limit plates 18 to move in a direction close to each other, so that the first limit plates 18 limit the door frame, at this time, the supporting part 181 of the first limit plate 18 is in contact with the top of the door frame, and then controls the telescopic rod of the fourth electric push rod 20 to extend, drives the moving plate 21 to move upward, and the moving plate 21 drives the second limit plate 22 to move upward, and raises the second limit plate 22, so that the top of the second limit plate 22 is higher than the top of the placement plate 132, and then controls the fifth electric push rod 23 to extend. The telescopic rod is shortened, driving the two second limit plates 22 to move towards each other, so that the second limit plates 22 limit the door frame to avoid the position of the door frame from being offset, and automatically limit the door frame, which is more convenient to operate. The second limit plate 22 will enter the receiving groove on the placement plate 132 to avoid the second limit plate 22 and the placement plate 132 from colliding. The vertical electric guide rail 4 is controlled to drive the lifting plate 5 to move downward, and the lifting plate 5 drives the connecting plate 6 to move downward. The connecting plate 6 drives the first laser welding head 8 to move downward so that the first laser welding head 8 contacts the gap at the top of the door frame. The inclined electric guide rail 7 is controlled to drive the first laser welding head 8 to move so that the first laser welding head 8 welds the gap at the top of the door frame. The gap welding at the top of the door frame is completed. Afterwards, the tilted electric guide rail 7 is controlled to drive the second laser welding head 11 to move so that the second laser welding head 11 is aligned with the gap inside the door frame, the telescopic rod of the first electric push rod 10 is controlled to extend, and the second laser welding head 11 is driven to move downward so that the second laser welding head 11 welds the gap inside the door frame. After the gap welding inside the door frame is completed, the telescopic rod of the first electric push rod 10 is controlled to shorten, and the second laser welding head 11 is driven to move upward and reset. The tilted electric guide rail 7 is controlled to drive the third laser welding head 13 to move so that the third laser welding head 13 is aligned with the gap outside the door frame, the telescopic rod of the second electric push rod 12 is controlled to extend, and the third laser welding head 13 is driven to move downward so that the third laser welding head 13 welds the gap outside the door frame. After the welding is completed on the gap outside the door frame, the telescopic rod of the second electric push rod 12 is controlled to shorten, driving the third laser welding head 13 to move upward and reset, and then the vertical electric guide rail 4 is controlled to drive the lifting plate 5 to move upward, and the lifting plate 5 drives the first laser welding head 8, the second laser welding head 11, the third laser welding head 13 and the circular plate 14 to move upward, and the first laser welding head 8, the second laser welding head 11 and the third laser welding head 13 are lifted to provide space for the rotation of the placement plate 132. The upward movement of the circular plate 14 will drive the rack 15 to move upward. The rack 15 will mesh with the gear 16 during the upward movement and drive the gear 16 to rotate. The gear 16 drives the rotating shaft 131 to rotate, and the rotating shaft 131 drives the placement plate 132 to rotate.The placement plate 132 drives the door frame to rotate and flip the door frame over so that the gap at the bottom of the door frame faces upward, and the door frame is automatically flipped over, which reduces manual intervention, reduces the workload of the staff, and improves production efficiency. The supporting portion 181 of the first limit plate 18 holds the door frame to prevent the door frame from falling down. After the door frame is flipped over, the vertical electric guide rail 4 is controlled to drive the lifting plate 5 to move downward, and the lifting plate 5 drives the first laser welding head 8, the second laser welding head 11, the third laser welding head 13 and the circular plate 14 to move downward, and the first laser welding head 8, the second laser welding head 11 and the third laser welding head 13 are lowered to make the first laser welding head 8 contact with the gap at the bottom of the door frame, and the first laser welding head 8 will enter the placement plate 132. The first laser welding head 8 is prevented from colliding with the placement plate 132. The downward movement of the circular plate 14 will drive the rack 15 to move downward, and the rack 15 drives the gear 16 to rotate in the opposite direction. Under the action of the one-way clutch, the gear 16 will not drive the rotating shaft 131 to rotate. The guide sleeve 35 can guide the circular plate 14 to make the circular plate 14 move up and down more smoothly. Then the inclined electric guide rail 7 is controlled to drive the first laser welding head 8 to move, so that the first laser welding head 8 welds the gap at the bottom of the door frame. The lower ends of the second laser welding head 11 and the third laser welding head 13 are higher than the lower ends of the first laser welding head 8, so the second laser welding head 11 and the third laser welding head 13 will not hit the placement plate 132.

[0040] Embodiment 2: Based on embodiment 1, Figure 11-13 As shown, it also includes a supporting mechanism, which includes a guide frame 24, an insert plate 25, a spring 26, an inclined plate 27 and a pressure rod 28. The guide frames 24 are symmetrically connected to the left and right sides of the installation box 2, and the insert plates 25 are slidably connected in the guide frames 24. Two springs 26 are connected between the insert plates 25 and the guide frames 24. The tops of the insert plates 25 are connected to the inclined plates 27. The pressure rods 28 are connected to the front and back sides of the middle of the circular plate 14. The pressure rods 28 are in contact with the inclined plates 27. Slots 29 are symmetrically opened on the left and right sides of the placement plate 132, and the insert plates 25 are located in the slots 29.

[0041] In the initial state, the pressure rod 28 presses the inclined plate 27, and the plug plate 25 is inserted in the slot 29 to support the placement plate 132, thereby improving the stability of the placement plate 132, and the spring 26 is in a stretched state; when the circular plate 14 moves upward, it will drive the pressure rod 28 to move upward, and the pressure rod 28 and the inclined plate 27 will be out of contact. Under the action of the spring 26, the plug plates 25 on the left and right sides move in the direction away from each other, and the plug plate 25 is moved out of the slot 29 to release the placement plate 132, so that the placement plate 132 can rotate normally. When the circular plate 14 moves downward, it will drive the pressure rod 28 to move downward, and the pressure rod 28 presses the inclined plate 27, so that the inclined plates 27 on the left and right sides move in the direction close to each other, and the inclined plates 27 drive the plug plates 25 on the left and right sides to move in the direction close to each other, and the spring 26 is stretched, and the plug plate 25 will be inserted into the slot 29 to support the placement plate 132 again.

[0042] like Fig.14 As shown, an injection mechanism is also included, which includes an air outlet pipe 30, a nozzle 31 and an air guide pipe 32. Two air outlet pipes 30 are connected to the sides of the two connecting plates 6 that are close to each other. The two air outlet pipes 30 on the same connecting plate 6 are symmetrically arranged front to back. The lower ends of the air outlet pipes 30 are connected to the nozzles 31. The nozzles 31 are aligned with the lower end of the first laser welding head 8 so that carbon dioxide can be sprayed to the welding part of the door frame. The upper ends of the two air outlet pipes 30 on the same connecting plate 6 are commonly connected to the air guide pipe 32.

[0043] When welding the door frame, the air duct 32 can be connected to carbon dioxide, and the carbon dioxide is sprayed from the nozzle 31 through the air duct 32 and the air outlet pipe 30 to the welding part of the door frame, thereby promoting metal evaporation during welding and improving welding stability.

[0044] like Fig.15 As shown, it also includes a unloading mechanism, which includes a cylinder 33 and a push plate 34. The cylinder 33 is connected to the middle of the top rear side of the installation box 2 by bolts, and the front end of the telescopic rod of the cylinder 33 is connected to the push plate 34. The bottom of the push plate 34 is higher than the top of the placement plate 132, and the push plate 34 will not collide with the placement plate 132 when moving forward.

[0045] After the door frame is welded, the telescopic rod of the third electric push rod 17 is controlled to extend, driving the two first limit plates 18 to move away from each other, and the welded door frame is released. Then, the telescopic rod of the fifth electric push rod 23 is controlled to extend, driving the two second limit plates 22 to move away from each other, and the welded door frame is released. Then, the telescopic rod of the fourth electric push rod 20 is controlled to shorten, driving the second limit plate 22 to move downward, and lowering the second limit plate 22 so that the top of the second limit plate 22 is lower than the top of the placement plate 132 to avoid the welded door frame from colliding with the second limit plate 22 during unloading. Then, the telescopic rod of the cylinder 33 is controlled to extend, driving the push plate 34 to move forward, and the push plate 34 pushes the welded door frame out to facilitate unloading by the staff.

[0046] The above description is only an example of the present invention and is not intended to limit the present invention. Any equivalent substitutions made within the principles of the present invention should be included in the protection scope of the present invention. The contents not elaborated in detail in the present invention belong to the existing technologies known to those skilled in the art.

Claims

1. A metal plate welding device for producing safety doors, comprising a frame (1), a mounting box (2), a mounting frame (3), a vertical electric guide rail (4) and a lifting plate (5), wherein the top of the frame (1) is connected to the mounting box (2), the top of the mounting box (2) is connected to two mounting frames (3), the top of the mounting box (2) is installed with two vertical electric guide rails (4), the vertical electric guide rails (4) and the mounting frame (3) are connected, and the lifting plate (5) is connected between the sliders of the two vertical electric guide rails (4), characterized in that: The lifting plate (5) further comprises a connecting plate (6), an inclined electric guide rail (7), a first laser welding head (8), a connecting block (9), a first electric push rod (10), a second laser welding head (11), a second electric push rod (12), a third laser welding head (13), a rotating shaft (131), a placing plate (132), a turning mechanism and a limiting mechanism. The bottom of the lifting plate (5) is connected to two connecting plates (6), and the connecting plates (6) are each connected to two inclined electric guide rails (7). The bottom of the sliders of the inclined electric guide rails (7) are each installed with a first laser welding head (8), and the first laser welding head (8) is each connected to a connecting block (9). The connecting blocks (9) are each connected to the first electric push rod (10) and the second electric push rod (12). The telescopic rods of an electric push rod (10) are all connected to a second laser welding head (11), the telescopic rods of a second electric push rod (12) are all connected to a third laser welding head (13), the left and right sides of the installation box (2) are rotatably connected to rotating shafts (131), a placement plate (132) is connected between the two rotating shafts (131), four metal plates are placed on the placement plate (132), and the four metal plates are placed into a door frame shape, the first laser welding head (8), the second laser welding head (11) and the third laser welding head (13) weld the gap on the door frame, the lifting plate (5) is provided with a turning mechanism for turning over the door frame, and the placement plate (132) is provided with a limiting mechanism for limiting the door frame.

2. A metal plate welding device for safety door production according to claim 1, characterized in that: The turning mechanism comprises a circular plate (14), a rack (15) and a gear (16); two circular plates (14) are connected to the bottom of the lifting plate (5); the circular plates (14) are each connected to a rack (15); the rotating shaft (131) is each connected to a gear (16) via a one-way clutch; the rack (15) meshes with the gear (16) during the upward movement.

3. A metal plate welding device for safety door production according to claim 2, characterized in that: The limiting mechanism comprises a third electric push rod (17), a first limiting plate (18), a mounting plate (19), a fourth electric push rod (20), a moving plate (21), a second limiting plate (22) and a fifth electric push rod (23). Two third electric push rods (17) are connected to the left and right sides of the top of the placement plate (132). The telescopic rods of the two third electric push rods (17) on the left are commonly connected to the first limiting plate (18). The telescopic rods of the two third electric push rods (17) on the right are also commonly connected to the first limiting plate (18). The first limiting plate (18) is used to limit the door frame. The upper sides of the two first limiting plates (18) close to each other are each provided with a The support portion (181) supports the door frame, the bottom of the placement plate (132) is connected to a mounting plate (19), the mounting plate (19) is connected to a fourth electric push rod (20), the telescopic rod of the fourth electric push rod (20) is connected to a moving plate (21), the front and rear sides of the moving plate (21) are both slidably connected to second limit plates (22), the bottom of the moving plate (21) is connected to two fifth electric push rods (23), the telescopic rod of the fifth electric push rod (23) is connected to the second limit plate (22), and the telescopic rod of the fifth electric push rod (23) can drive the two second limit plates (22) to move in a direction close to each other, so that the second limit plates (22) limit the door frame.

4. A metal plate welding device for safety door production according to claim 3, characterized in that: The invention also includes a supporting mechanism, which includes a guide frame (24), a plug plate (25), a spring (26), an inclined plate (27) and a pressure rod (28). The guide frame (24) is connected to both left and right sides of the installation box (2). The plug plate (25) is slidably connected to the guide frame (24). A spring (26) is connected between the plug plate (25) and the guide frame (24). The plug plate (25) is connected to the inclined plate (27). The circular plate (14) is connected to the pressure rod (28). The placement plate (132) is provided with slots (29) on both left and right sides. The pressure rod (28) is used to press the inclined plate (27) so that the plug plate (25) is inserted into the slot (29) to support the placement plate (132).

5. A metal plate welding device for safety door production according to claim 4, characterized in that: The invention also comprises an air jet mechanism, which comprises an air outlet pipe (30), a nozzle (31) and an air guide pipe (32). The connecting plate (6) is connected to two air outlet pipes (30), and the air outlet pipes (30) are connected to nozzles (31) for spraying carbon dioxide onto the welding part of the door frame. The upper ends of the two air outlet pipes (30) on the same connecting plate (6) are connected to the air guide pipe (32).

6. A metal plate welding device for safety door production according to claim 5, characterized in that: It also includes a discharge mechanism, which includes a cylinder (33) and a push plate (34). The top of the installation box (2) is connected to the cylinder (33), and the telescopic rod of the cylinder (33) is connected to the push plate (34).

7. A metal plate welding device for safety door production according to claim 6, characterized in that: It also includes a guide sleeve (35), and the vertical electric guide rail (4) is connected to the guide sleeve (35) for guiding the circular plate (14). The circular plate (14) is located in the guide sleeve (35), and the circular plate (14) and the guide sleeve (35) are slidably connected.

8. A metal plate welding device for safety door production according to claim 7, characterized in that: Notches are provided at the four corners of the placement plate (132).

9. A metal plate welding device for safety door production according to claim 8, characterized in that: Receiving grooves for receiving the second limiting plate (22) are provided on both the front and rear sides of the placement plate (132).

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