Automatic welding tool for steel structure

Abstract

The application discloses a kind of steel structure automatic welding tool, including machine tool, loading box, feed-out assembly, pressure assembly and gas replacement assembly.Feeding block of feed-out assembly moves with transmission belt, and the steel plate in loading box is pushed to rotating plate in opposite direction; feeding block is sequentially pressed third wedge surface block in the process of advancing, so that piston reciprocates in piston cylinder and inert gas in gas storage tank is delivered to gas storage bag.Pressure seat of pressure assembly is pressed tightly to steel plate, and the gas outlet hole in the inside of pressure seat guides inert gas output by gas storage bag to weld area.After welding is completed, feeding block runs to below with transmission belt and acts on pressure plate, so that first wedge surface block exits below rotating plate, and rotating plate is turned over and unloaded under the action of spiral spring.The application sequentially completes feeding, gas storage triggering and unloading triggering using the cyclic movement of feeding block, and the structure is compactly matched, and can reduce workpiece deviation and weld oxidation in welding process.

Description

Technical Field

[0001] This invention relates to the field of welding fixture technology, and in particular to an automatic welding fixture for steel structures. Background Technology

[0002] Steel structures are widely used in factories, bridges, and prefabricated buildings, and butt welding of steel plates is a basic processing procedure.

[0003] Existing fixtures for butt welding of steel plates typically separate the feeding, clamping, shielding gas supply, and post-weld unloading processes. These mechanisms require individual drives or manual operation, resulting in large equipment footprints and complex operational sequences. Especially after the plates are clamped, if the shielding gas cannot be stably delivered to the weld area, air can easily get into the weld zone. Furthermore, the workpiece located in the center of the worktable is difficult to remove directly after welding. In addition, rigid clamping can easily cause excessive localized stress on the plate. Therefore, a welding fixture is needed that can utilize the existing motion of the feeding mechanism to trigger gas storage and unloading, while also providing flexible clamping and gas supply to the weld area. Summary of the Invention

[0004] The purpose of this invention is to provide an automatic welding fixture for steel structures. The fixture utilizes the cyclical movement of the feed block along the transmission belt to drive the gas storage mechanism while pushing the steel plate, and triggers the rotating plate to flip and unload the material after welding is completed. At the same time, the steel plate is elastically pressed by the pressure seat, and the inert gas is directed to the weld area to simplify the action coordination between the various mechanisms.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An automatic welding fixture for steel structures includes a machine tool and loading boxes disposed on both sides of the machine tool. The machine tool is provided with a feeding and discharging assembly, a pressing assembly, and a gas replacement assembly. The feeding and discharging assembly includes a rotating plate, a spiral spring, a conveying unit, and a discharging unit. The rotating plate is disposed in the middle of the machine tool, and the spiral spring is disposed in a slot of the machine tool and connected to the rotating shaft of the rotating plate.

[0007] The conveying unit includes a motor, a wheel assembly, a transmission belt, and a feed block. The transmission belt is located in a slot in the machine tool, and the feed block is fixed on the transmission belt to push the steel plate in the loading box to the rotating plate.

[0008] The discharge unit includes a first wedge block, a second wedge block, and a pressure plate for moving the first wedge block, located below the rotating plate. When the feed block moves to the bottom with the transmission belt, it abuts against the pressure plate to make the first wedge block exit below the rotating plate.

[0009] The pressing assembly includes a pressing seat that can move downwards, the pressing seat being hollow inside and having an air vent on its inner side facing the weld area;

[0010] The gas replacement assembly includes a gas storage tank, a piston cylinder, a gas storage bladder, and a pressure relief pipe. The piston cylinder is connected to the gas storage tank through an inlet pipe and to the gas storage bladder through an outlet pipe. The gas storage bladder is connected to the inner cavity of the pressure relief seat through the pressure relief pipe. The slot is provided with several third wedge blocks that are connected to the piston inside the piston cylinder. During the process of pushing the steel plate, the feed block presses against the third wedge blocks in sequence, so that the piston moves back and forth and delivers the inert gas in the gas storage tank to the gas storage bladder.

[0011] Preferably, the motor is mounted below the machine tool, and a second mounting plate is mounted below the machine tool. One of the rollers in the roller assembly is fixedly connected to the output shaft of the motor, and the other roller is rotatably connected to the second mounting plate via a shaft. The two rollers are connected by a transmission belt. The slot extends along the conveying direction of the steel plate, and the feed block extends out of the slot and moves with the transmission belt.

[0012] Preferably, the discharge unit further includes a first mounting box, a second mounting box, a pressing block, a sliding rod, a first spring, a connecting block, a telescopic cylinder, a second spring, a first electric push rod, a pull plate, and a pull rod. The first mounting box is installed below the machine tool, the second mounting box is installed inside the first mounting box, and the telescopic cylinder is installed inside the second mounting box. The first wedge block is fixedly connected to the telescopic end of the telescopic cylinder. The second spring is sleeved on the outside of the telescopic end of the telescopic cylinder, and both ends of the second spring are fixedly connected to the first wedge block and the telescopic cylinder, respectively. The first wedge block is fixedly connected to the connecting block, the pressing block is fixedly connected to the sliding rod, and the sliding rod passes through the bottom of the first mounting box and is slidably connected to the first mounting box. When the pressing block moves along the axial direction of the sliding rod, it pushes the connecting block and the first wedge block to move synchronously. The first spring is sleeved on the outside of the sliding rod, and both ends of the first spring are fixedly connected to the pressing block and the bottom of the first mounting box, respectively.

[0013] Preferably, one end of the slide rod extending out of the first mounting box is fixedly connected to the pull plate, the pull rod is fixedly connected to the pull plate, the pressure plate is fixedly connected to the pull rod, and the side of the pressure plate facing the feed block is set as an arc surface. When the feed block moves downward with the transmission belt, it gradually abuts against the arc surface of the pressure plate. The first wedge block and the second wedge block are located below the rotating plate to support the rotating plate during the welding process. A first mounting plate is installed below the machine tool, and the first electric push rod is installed on the first mounting plate. The telescopic end of the first electric push rod is connected to the rotating plate for driving the rotating plate to reset.

[0014] Preferably, the pressing assembly further includes a second electric push rod, a toothed plate, a sliding plate, a screw, a first guide rod, a second guide rod, a third spring, and a gear. The second electric push rod is mounted on a machine tool, and the telescopic end of the second electric push rod is fixedly connected to the toothed plate. The screw is rotatably connected to the machine tool, the first guide rod is fixedly connected to the machine tool, the sliding plate is threadedly connected to the screw and slidably connected to the first guide rod, and the gear is fixedly connected to the screw and meshes with the toothed plate.

[0015] Preferably, the second guide rod passes through the slide plate and is slidably connected to the slide plate; the lower end of the second guide rod is fixedly connected to the pressure seat; the third spring is sleeved on the outside of the second guide rod, and the two ends of the third spring are fixedly connected to the slide plate and the pressure seat respectively; the air vents are arranged at intervals along the inner side of the pressure seat.

[0016] Preferably, the gas replacement assembly further includes a gas storage mechanism for delivering inert gas to the gas storage bladder in stages, the gas storage bladder being installed inside the machine tool.

[0017] Preferably, the gas storage mechanism further includes a slider box, a piston rod, and a fourth spring. The slot is provided with a plurality of mounting slots. The slider box and the piston cylinder are installed in the mounting slots. The third wedge block is slidably disposed in the slider box. The piston is slidably disposed in the piston cylinder. One end of the piston rod is fixedly connected to the third wedge block, and the other end is fixedly connected to the piston. The fourth spring is sleeved on the outside of the piston rod, and both ends of the fourth spring are fixedly connected to the bottom of the third wedge block and the slider box, respectively.

[0018] Preferably, both the air inlet pipe and the air outlet pipe are equipped with one-way valves, and the pressure relief pipe is equipped with a pressure relief valve.

[0019] The present invention has the following beneficial effects:

[0020] 1. This invention utilizes a feed block on a transmission belt to push a steel plate. After the feed block moves to the bottom of the transmission belt, it acts on a pressure plate. The pressure plate, through a pull rod, pull plate, slide rod, pressure block, and connecting block, drives the first wedge block to exit below the rotating plate, causing the rotating plate to flip and unload under the action of a spiral spring. Thus, the feeding motion of the steel plate and the post-weld unloading trigger share the same cycle stroke of the feed block, reducing the need for a separate unloading trigger drive.

[0021] 2. The pressure seat moves downward under the drive of the second electric push rod, toothed plate, gear and screw, and applies elastic pressure to the steel plate through the second guide rod and the third spring, which can reduce the excessive local force caused by rigid pressing. When the pressure seat presses the steel plate, it is located around the weld. The vent on its inner side can guide the inert gas to the weld area, so that pressing, spatter shielding and gas guidance are completed by the same pressure seat.

[0022] 3. During the process of pushing the steel plate, the feeding block presses against multiple third wedge blocks in sequence. The third wedge blocks reciprocate under the action of the fourth spring and drive the piston to move back and forth in the piston cylinder via the piston rod. With the cooperation of the one-way valves in the air inlet and outlet pipes, the inert gas is transported from the gas storage tank to the gas storage bladder in stages, and then discharged to the weld area through the pressure relief pipe and the gas outlet of the pressure seat. This allows the gas storage action to be completed by the feeding stroke, and helps to reduce the influence of air in the weld area on the high-temperature weld bead. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an automatic welding fixture for steel structures proposed in this invention;

[0024] Figure 2 This is a schematic diagram of the bottom structure of an automatic welding fixture for steel structures proposed in this invention.

[0025] Figure 3 This is a schematic diagram of the connection structure of the pressure-resistant component;

[0026] Figure 4 This is a schematic diagram of the cross-sectional structure of the machine tool;

[0027] Figure 5 A schematic diagram of the connection structure of the gas storage mechanism;

[0028] Figure 6 This is a schematic diagram of the internal cross-sectional structure of the first mounting box and the second mounting box;

[0029] Figure 7 for Figure 1 Enlarged view of point A in the middle;

[0030] Figure 8 for Figure 2 Enlarged view at point B in the middle;

[0031] Figure 9 for Figure 2 Enlarged view at point C;

[0032] Figure 10 for Figure 3 Enlarged view at point D;

[0033] Figure 11 for Figure 4 Enlarged view at point E in the middle;

[0034] Figure 12 This is a schematic diagram of the back structure of the machine tool.

[0035] In the diagram: 1 Machine tool, 2 Loading box, 3 Motor, 4 Roller assembly, 5 Transmission belt, 6 Feed block, 7 Slotted section, 8 Rotating plate, 9 Scroll spring, 10 First mounting box, 11 Second mounting box, 12 Pressing block, 13 Slide rod, 14 First spring, 15 Connecting block, 16 First wedge block, 17 Telescopic cylinder, 18 Second spring, 19 Second wedge block, 20 First mounting plate, 21 First electric push rod, 22 Second electric push rod, 23 Gear 24 Plate, 25 Screw, 26 First Guide Rod, 27 Second Guide Rod, 28 Pressure Seat, 29 Third Spring, 30 Gear, 31 Air Outlet, 32 Third Wedge Block, 33 Slider Box, 34 Piston Cylinder, 35 Piston, 36 Piston Rod, 37 Fourth Spring, 38 Air Inlet Pipe, 39 Air Outlet Pipe, 40 Air Tank, 41 Air Bag, 42 Pressure Relief Pipe, 43 Pull Plate, 44 Pull Rod, 45 Pressure Plate, 46 Second Mounting Plate. Detailed Implementation

[0036] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] Example 1

[0038] Reference Figure 1 , Figure 2 , Figure 4 , Figure 6 , Figure 7 , Figure 8 , Figure 9 , Figure 12 An automatic steel structure welding fixture includes a machine tool 1 and loading boxes 2 disposed on both sides of the machine tool 1. The machine tool 1 is equipped with a feeding / discharging assembly, a pressing assembly, and a gas replacement assembly. The feeding / discharging assembly is used to transport the steel plate in the loading box 2 to a rotating plate 8 and to flip it over to unload the steel plate after welding. The pressing assembly is used to apply elastic pressure from above the steel plate to reduce the displacement and warping of the steel plate during the welding process. The gas replacement assembly guides inert gas through the vent 31 inside the pressing seat 28 to the weld area to reduce the influence of air on the high-temperature weld bead.

[0039] The feeding and discharging assembly includes a rotating plate 8, a spiral spring 9, and a feeding and discharging mechanism. The feeding and discharging mechanism is used to control the automatic feeding and discharging of materials. The rotating plate 8 is installed in the middle of the machine tool 1. Slots are opened at both ends of the middle of the machine tool 1. The spiral spring 9 is installed in the slots. The spiral spring 9 is connected to the side wall of the rotating plate 8 through a rotating shaft.

[0040] The feeding and discharging mechanism includes a conveying unit and a discharging unit. The conveying unit includes a motor 3, a roller assembly 4, a transmission belt 5, and a feeding block 6. The motor 3 is installed below the machine tool 1. A second mounting plate 46 is installed below the machine tool 1. One roller in the roller assembly 4 is fixedly connected to the output shaft of the motor 3, and the other roller is rotatably connected to the second mounting plate 46 through a shaft. The two rollers are connected by transmission belt 5. The feeding block 6 is fixedly connected to the transmission belt 5. The machine tool 1 is provided with a slot 7 extending along the conveying direction of the steel plate. The transmission belt 5 is located in the slot 7, and the feeding block 6 extends out from the slot 7.

[0041] The discharge unit includes a first mounting box 10, a second mounting box 11, a pressing block 12, a sliding rod 13, a first spring 14, a connecting block 15, a first wedge block 16, a telescopic cylinder 17, a second spring 18, a second wedge block 19, a first electric push rod 21, a pull plate 43, a pull rod 44, and a pressing plate 45. The first mounting box 10 is installed below the machine tool 1, the second mounting box 11 is installed inside the first mounting box 10, the telescopic cylinder 17 is installed inside the second mounting box 11, the first wedge block 16 is fixedly connected to the telescopic end of the telescopic cylinder 17, and the second spring 18 is sleeved on the outside of the telescopic end of the telescopic cylinder 17, with both ends of the second spring 18 fixedly connected to the first wedge block 16 and the telescopic cylinder 17, respectively. The first wedge block 16 is fixedly connected to the connecting block 15, and the pressing block 12 is fixedly connected to the sliding rod 13. The sliding rod 13 passes through the bottom of the first mounting box 10 and is slidably connected to the first mounting box 10. When the pressing block 12 moves along the axial direction of the sliding rod 13, it pushes the connecting block 15 and the first wedge block 16 to move synchronously. The first spring 14 is sleeved on the outside of the sliding rod 13, and the two ends of the first spring 14 are fixedly connected to the pressing block 12 and the bottom of the first mounting box 10, respectively.

[0042] One end of the slide bar 13 extending out of the first mounting box 10 is fixedly connected to the pull plate 43. The pull rod 44 is fixedly connected to the pull plate 43. The pressure plate 45 is fixedly connected to the pull rod 44, and the side of the pressure plate 45 facing the feed block 6 is set with an arc surface. When the feed block 6 moves downward with the transmission belt 5, it gradually abuts against the arc surface of the pressure plate 45. The first wedge block 16 and the second wedge block 19 are located below the rotating plate 8 to jointly support the rotating plate 8 during the feeding and welding process. A first mounting plate 20 is installed below the machine tool 1. A first electric push rod 21 is installed on the first mounting plate 20. The telescopic end of the first electric push rod 21 is connected to the rotating plate 8 and is used to drive the rotating plate 8 to reset after unloading.

[0043] In this embodiment, the welding assembly can be arranged above the rotating plate 8. During loading, the motors 3 located on both sides of the machine tool 1 are started, the roller assembly 4 drives the transmission belt 5 to move, and the feed block 6 moves with the transmission belt 5, pushing the steel plates at the bottom of the two loading boxes 2 towards each other to the rotating plate 8. After the steel plates reach the welding position, they are pressed by the pressing assembly and the welding assembly completes the welding. After welding, the transmission belt 5 continues to run, the feed block 6 rotates to below the transmission belt 5 and gradually presses against the pressing plate 45. The pressing plate 45 drives the slide rod 13 to move axially via the pull rod 44 and the pull plate 43. The pressing block 12 on the slide rod 13 pushes the connecting block 15 and the first wedge block 16 to move, so that the first wedge block 16 exits below the rotating plate 8. After the rotating plate 8 is released from support, it flips clockwise under the action of the spiral spring 9, so that the welded workpiece is discharged from below the rotating plate 8. After unloading, the first electric push rod 21 drives the rotating plate 8 back to the support position, and the first wedge block 16 is reset under the action of the second spring 18.

[0044] Example 2

[0045] Reference Figure 3 , Figure 5 , Figure 10 , Figure 11 The pressing assembly includes a second electric push rod 22, a toothed plate 23, a sliding plate 24, a screw 25, a first guide rod 26, a second guide rod 27, a pressing seat 28, a third spring 29, and a gear 30. The second electric push rod 22 is mounted on the machine tool 1, and its telescopic end is fixedly connected to the toothed plate 23. The screw 25 is rotatably connected to the machine tool 1, the first guide rod 26 is fixedly connected to the machine tool 1, the sliding plate 24 is threadedly connected to the screw 25 and slidably connected to the first guide rod 26, and the gear 30 is fixedly connected to the screw 25 and meshes with the toothed plate 23. When the second electric push rod 22 drives the toothed plate 23 to move, the toothed plate 23 drives the gear 30 and the screw 25 to rotate, and the sliding plate 24 moves up and down along the screw 25 under the constraint of the first guide rod 26.

[0046] The second guide rod 27 slides through the slide plate 24 and is fixedly connected to the lower end of the second guide rod 27 and the pressure seat 28. The third spring 29 is arranged around the second guide rod 27, and one end is fixedly connected to the slide plate 24 and the other end is fixedly connected to the pressure seat 28. The pressure seat 28 is hollow inside and has several air vents 31 arranged on the inner side.

[0047] The gas replacement assembly includes a gas storage bladder 41, a pressure relief pipe 42, and a gas storage mechanism for delivering inert gas to the gas storage bladder 41 in stages. The gas storage bladder 41 is installed inside the machine tool 1. One end of the pressure relief pipe 42 is connected to the gas storage bladder 41, and the other end is connected to the inner cavity of the pressure seat 28.

[0048] The gas storage mechanism includes a third wedge block 32, a slider box 33, a piston cylinder 34, a piston 35, a piston rod 36, a fourth spring 37, an air inlet pipe 38, an air outlet pipe 39, and a gas storage tank 40. The slot 7 is provided with several mounting slots. The slider box 33 and the piston cylinder 34 are installed in the mounting slots. The third wedge block 32 slides in the slider box 33, and the piston 35 slides in the piston cylinder 34. One end of the piston rod 36 is fixedly connected to the third wedge block 32, and the other end is fixedly connected to the piston 35. The fourth spring 37 is arranged around the piston rod 36, and one end is fixedly connected to the third wedge block 32, and the other end is fixedly connected to the bottom of the slider box 33.

[0049] One end of the air inlet pipe 38 is connected to the piston cylinder 34 and the other end is connected to the air storage tank 40. One end of the air outlet pipe 39 is connected to the piston cylinder 34 and the other end is connected to the air storage bladder 41. Both the air inlet pipe 38 and the air outlet pipe 39 are equipped with one-way valves, and the pressure relief pipe 42 is equipped with a pressure relief valve.

[0050] In this embodiment, after the steel plates are conveyed to the rotating plate 8, the second electric push rod 22 drives the toothed plate 23 to move. The toothed plate 23 drives the screw 25 to rotate through the gear 30. The sliding plate 24 moves downward along the screw 25 under the restriction of the first guide rod 26. When the sliding plate 24 moves downward, the pressure seat 28 first contacts the steel plate. Then, the sliding plate 24 continues to move downward and compresses the third spring 29, so that the pressure seat 28 applies elastic pressure to the steel plate through the third spring 29. The pressure seat 28 is located around the weld and can shield welding spatter. At the same time, the vent 31 on the inner side of the pressure seat 28 faces the weld area so as to send inert gas to the vicinity of the weld.

[0051] Furthermore, when the transmission belt 5 drives the feed block 6 to move along the slot 7 and push the steel plate, the feed block 6 sequentially presses against multiple third wedge blocks 32, causing the third wedge blocks 32 to retract into the slider box 33 and push the piston 35 to move via the piston rod 36; after the feed block 6 passes, the third wedge blocks 32 are reset under the action of the fourth spring 37, and the piston 35 moves in the opposite direction. When the piston 35 moves back and forth, with the cooperation of the one-way valves in the air inlet pipe 38 and the air outlet pipe 39, the inert gas in the air storage tank 40 is sent into the air storage bladder 41 in stages through the piston cylinder 34. After the feeding is completed, the inert gas in the air storage bladder 41 enters the inner cavity of the pressure seat 28 through the pressure relief pipe 42 and is discharged to the weld area through the air outlet 31, thereby reducing the influence of air in the weld area on the high-temperature weld bead.

[0052] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An automatic welding fixture for steel structures, comprising a machine tool (1) and loading boxes (2) disposed on both sides of the machine tool (1), characterized in that, The machine tool (1) is provided with a feeding and discharging assembly, a pressing assembly and a gas replacement assembly; the feeding and discharging assembly includes a rotating plate (8), a spiral spring (9), a conveying unit and a discharging unit. The rotating plate (8) is located in the middle of the machine tool (1), and the spiral spring (9) is located in the slot of the machine tool (1) and connected to the rotating shaft of the rotating plate (8). The conveying unit includes a motor (3), a wheel assembly (4), a transmission belt (5), and a feed block (6). The transmission belt (5) is located in the slot (7) of the machine tool (1), and the feed block (6) is fixed on the transmission belt (5) to push the steel plate in the loading box (2) to the rotating plate (8). The discharge unit includes a first wedge block (16), a second wedge block (19) located below the rotating plate (8), and a pressure plate (45) for moving the first wedge block (16). When the feed block (6) moves to the bottom with the transmission belt (5), it abuts against the pressure plate (45) so that the first wedge block (16) exits below the rotating plate (8). The pressing assembly includes a pressing seat (28) that can move downwards, the pressing seat (28) being hollow inside and having an air vent (31) facing the weld area on its inner side. The gas replacement assembly includes a gas storage tank (40), a piston cylinder (34), a gas storage bladder (41), and a pressure relief pipe (42). The piston cylinder (34) is connected to the gas storage tank (40) through an air inlet pipe (38) and to the gas storage bladder (41) through an air outlet pipe (39). The gas storage bladder (41) is connected to the inner cavity of the pressure relief seat (28) through the pressure relief pipe (42). The slot (7) is provided with several third wedge blocks (32) that are connected to the piston (35) in the piston cylinder (34). The feed block (6) presses against the third wedge blocks (32) in sequence during the process of pushing the steel plate, so that the piston (35) moves back and forth and delivers the inert gas in the gas storage tank (40) to the gas storage bladder (41).

2. The automatic welding fixture for steel structures according to claim 1, characterized in that, The motor (3) is installed below the machine tool (1), and a second mounting plate (46) is installed below the machine tool (1). One of the rollers in the roller group (4) is fixedly connected to the output shaft of the motor (3), and the other roller is rotatably connected to the second mounting plate (46) through a rotating shaft. The two rollers are connected by a transmission belt (5). The slot (7) extends along the conveying direction of the steel plate, and the feed block (6) extends out from the slot (7) and moves with the transmission belt (5).

3. The automatic welding fixture for steel structures according to claim 2, characterized in that, The discharge unit also includes a first mounting box (10), a second mounting box (11), a pressing block (12), a sliding rod (13), a first spring (14), a connecting block (15), a telescopic cylinder (17), a second spring (18), a first electric push rod (21), a pull plate (43), and a pull rod (44). The first mounting box (10) is installed below the machine tool (1), the second mounting box (11) is installed inside the first mounting box (10), and the telescopic cylinder (17) is installed inside the second mounting box (11). The first wedge block (16) is fixedly connected to the telescopic end of the telescopic cylinder (17), and the second spring (18) is sleeved on the outside of the telescopic end of the telescopic cylinder (17). The two ends of the second spring (18) are fixedly connected to the first wedge block (16) and the telescopic cylinder (17) respectively; the first wedge block (16) is fixedly connected to the connecting block (15), the pressing block (12) is fixedly connected to the slide rod (13), the slide rod (13) passes through the bottom of the first mounting box (10) and is slidably connected to the first mounting box (10), when the pressing block (12) moves along the axial direction of the slide rod (13), it pushes the connecting block (15) and the first wedge block (16) to move synchronously, the first spring (14) is sleeved on the outside of the slide rod (13), and the two ends of the first spring (14) are fixedly connected to the pressing block (12) and the bottom of the first mounting box (10) respectively.

4. The automatic welding fixture for steel structures according to claim 3, characterized in that, The end of the slide bar (13) extending out of the first mounting box (10) is fixedly connected to the pull plate (43). The pull rod (44) is fixedly connected to the pull plate (43). The pressure plate (45) is fixedly connected to the pull rod (44). The side of the pressure plate (45) facing the feed block (6) is set as an arc surface. When the feed block (6) moves to the bottom with the transmission belt (5), it gradually abuts against the arc surface of the pressure plate (45). The first wedge block (16) and the second wedge block (19) are located below the rotating plate (8) to support the rotating plate (8) during the welding process. The first mounting plate (20) is installed below the machine tool (1). The first electric push rod (21) is installed on the first mounting plate (20). The telescopic end of the first electric push rod (21) is connected to the rotating plate (8) to drive the rotating plate (8) to reset.

5. The automatic welding fixture for steel structures according to claim 2, characterized in that, The pressing assembly also includes a second electric push rod (22), a toothed plate (23), a sliding plate (24), a screw (25), a first guide rod (26), a second guide rod (27), a third spring (29), and a gear (30). The second electric push rod (22) is mounted on the machine tool (1). The telescopic end of the second electric push rod (22) is fixedly connected to the toothed plate (23). The screw (25) is rotatably connected to the machine tool (1). The first guide rod (26) is fixedly connected to the machine tool (1). The sliding plate (24) is threadedly connected to the screw (25) and slidably connected to the first guide rod (26). The gear (30) is fixedly connected to the screw (25) and meshes with the toothed plate (23).

6. The automatic welding fixture for steel structures according to claim 5, characterized in that, The second guide rod (27) passes through the slide plate (24) and is slidably connected to the slide plate (24). The lower end of the second guide rod (27) is fixedly connected to the pressure seat (28). The third spring (29) is sleeved on the outside of the second guide rod (27), and the two ends of the third spring (29) are fixedly connected to the slide plate (24) and the pressure seat (28) respectively. The air vent (31) is arranged at intervals along the inner side of the pressure seat (28).

7. The automatic welding fixture for steel structures according to claim 6, characterized in that, The gas replacement assembly also includes a gas storage mechanism for delivering inert gas to the gas storage bladder (41) in stages, the gas storage bladder (41) being installed inside the machine tool (1).

8. The automatic welding fixture for steel structures according to claim 7, characterized in that, The gas storage mechanism also includes a slider box (33), a piston rod (36) and a fourth spring (37). The slot (7) is provided with several mounting slots. The slider box (33) and the piston cylinder (34) are installed in the mounting slots. The third wedge block (32) is slidably disposed in the slider box (33). The piston (35) is slidably disposed in the piston cylinder (34). One end of the piston rod (36) is fixedly connected to the third wedge block (32), and the other end is fixedly connected to the piston (35). The fourth spring (37) is sleeved on the outside of the piston rod (36), and both ends of the fourth spring (37) are fixedly connected to the bottom of the third wedge block (32) and the slider box (33) respectively.

9. The automatic welding fixture for steel structures according to claim 8, characterized in that, Both the air inlet pipe (38) and the air outlet pipe (39) are equipped with one-way valves, and the pressure relief pipe (42) is equipped with a pressure relief valve.

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