Steel structure rib plate welding device

Abstract

The present application relates to the technical field of steel structure welding, and particularly relates to a steel structure rib plate welding device, which comprises connecting bottom plates, the number of the connecting bottom plates is two, the upper surfaces of the two connecting bottom plates are both provided with power telescopic frames, the two power telescopic frames are connected through two detachable support structures, and a plurality of pressing structures are slidably inserted between the two detachable support structures. The present application can move the horizontal frame downward through the detachable support structure when the power telescopic frame is contracted by arranging the components such as the horizontal plate, the upper pressing plate and the side clamping plate, the two side clamping plates are contacted with the two sides of the U-shaped rib plate through the elastically connected upper pressing plate, then the two side clamping plates are gradually moved upward relative to the upper pressing plate under the rib plate blockage in the process that the horizontal frame continues to move downward, the upper pressing plate is contacted with the upper surface of the rib plate after the upper pressing plate is moved downward, the upper surface of the rib plate is pressed by the upper pressing plate, and the two side clamping plates are limited on the two sides of the rib plate, so that the transverse displacement of the rib plate is prevented during welding.

Description

Technical Field

[0001] The invention relates to the technical field of steel structure welding, in particular to a steel structure rib welding device. Background Art

[0002] Plasma welding technology is a welding method that uses a plasma arc as a heat source. Orthotropic steel bridge decks, with their advantages of light weight, high load-bearing capacity, and short construction periods, have been widely used in steel bridge construction, especially in kilometer-long bridges spanning rivers, streams, and seas, where their technical advantages are even more significant. However, due to stress concentration caused by local wheel loads and structural details, orthotropic steel bridge decks are particularly prone to various fatigue cracking issues. Root cracks, which are prone to occur in the welds between U-shaped ribs and panels, are a major concern. During welding, the ribs are placed on the panels to be connected.

[0003] Chinese Patent Publication No. CN116237621A discloses a U-rib welding device and welding process for steel structure bridges, comprising: a welding system and a pretreatment system, wherein the U-rib is welded by the welding system; the pretreatment system comprises an internal treatment system and an external treatment system; the internal treatment system comprises a movable trolley, a base, and a first loading mechanism; the base is a hollow structure fixed to the base of the movable trolley, and the first loading mechanisms are symmetrically arranged on the left and right sides of the base, through which the inner groove of the U-rib is loaded; the external treatment system comprises a movable gantry structure and a second loading mechanism; the second loading mechanism is used to load the outer weld of the U-rib. This invention adopts full penetration welding and pretreatment processes to improve the overall quality of the steel bridge deck. The above-mentioned related technologies have the following defects: in the prior art, when welding ribs, only the upper part of the ribs is generally pressed and fixed. When the ribs are subjected to lateral forces, the ribs are easily displaced, resulting in misalignment between the ribs and the steel bridge deck after welding. Therefore, a steel structure rib welding device is proposed. Summary of the Invention

[0004] In order to prevent the rib from being misaligned when being welded to the steel bridge deck, the present invention provides a steel structure rib welding device.

[0005] The present invention provides a steel structure rib welding device, which adopts the following technical solution: it includes a connecting base plate, there are two connecting base plates, and the upper surfaces of the two connecting base plates are both installed with a power telescopic frame. The two power telescopic frames are connected by two detachable supporting structures, and multiple pressing structures are slidably inserted between the two detachable supporting structures.

[0006] The pressing structure comprises a cross frame and an elastic telescopic frame, the upper end of the elastic telescopic frame is fixed with the cross frame, the two ends of the cross frame are respectively slidably connected with two detachable support structures, the lower end of the elastic telescopic frame is fixed with a horizontal plate, the upper side of the horizontal plate is provided with an upper pressing plate, the upper pressing plate is elastically connected with the horizontal plate, the two ends of the upper pressing plate are slidably inserted with side clamping plates, the two side clamping plates are distributed in an inverted eight character shape, and the side clamping plates are slidably connected with the upper pressing plate.

[0007] Optionally, the upper end of one of the two power telescopic frames is rotatably connected with a power winding cylinder away from one side of the adjacent pressing structure, the circumferential side of the power winding cylinder is wound with a pull rope, the pull rope is slidably penetrated through the upper end of the adjacent power telescopic frame, one end of the pull rope between the two power telescopic frames is fixed with the adjacent cross frame, the upper surface of the cross frame is rotatably connected with a winding wheel, the circumferential side of the winding wheel is wound with a fixed distance rope, the lower end of the fixed distance rope is slidably penetrated through the upper surface of the cross frame and then penetrates out from the front surface of the cross frame, the power telescopic frame away from the power winding cylinder among the two power telescopic frames is fixed with the adjacent fixed distance rope, and the cross frame is detachably connected with the adjacent rear fixed distance rope.

[0008] Optionally, a threaded rod is fixed at the axis of the winding wheel, a threaded cylinder is threadedly sleeved on the outer surface of the threaded rod, a track telescopic rod is parallelly arranged below the threaded cylinder, and the two ends of the track telescopic rod are respectively fixed with the adjacent cross frame below and the adjacent threaded cylinder above.

[0009] Optionally, the detachable support structure comprises two end frames and a plurality of side frames, the ends of the two end frames away from each other are respectively fixed with the upper ends of the two power telescopic frames, the ends of the two end frames close to each other are respectively slidably connected with the adjacent side frames, the side frames are slidably connected with the adjacent side frames, one end of the side frame is a protruding plate structure, the other end of the side frame is a groove structure, the end frame and the adjacent side frame and every two adjacent side frames are detachably connected through a clamping block, the two ends of the cross frame are respectively slidably connected with the adjacent side frames, and the end of the side frame close to the cross frame is a groove structure matched with the cross frame.

[0010] Optionally, a steering wheel is rotatably connected inside the cross frame, the fixed distance rope passes below the steering wheel, the lower end of the fixed distance rope is horizontal, and the upper end of the fixed distance rope is vertical.

[0011] Optionally, an intermediate top plate is arranged above each side frame on the right side of the cross frame, a side end top plate is arranged above each end frame on the right side of the cross frame, the side end top plate is slidably connected with the adjacent intermediate top plate, the adjacent two intermediate top plates are slidably connected, one end of the intermediate top plate is a protruding structure, the other end of the intermediate top plate is a groove structure, a bent telescopic rod A is fixed on the right side of the intermediate top plate, the other end of the bent telescopic rod A is fixed with the adjacent side frame below, a bent telescopic rod B is fixed on the right side of the side end top plate, the other end of the bent telescopic rod B is fixed with the adjacent end frame below, the ends of the two end frames away from each other are respectively fixed with synchronous power telescopic rods, and the upper ends of the two synchronous power telescopic rods are respectively fixed with the two power telescopic frames.

[0012] Optionally, the upper pressing plate upper surface is slidably inserted with tooth insertion plates, the side close to each other of the two tooth insertion plates is rotationally connected with a hinged plate, the hinged plate upper end is rotationally connected with the adjacent upper horizontal plate, and the side close to each other of the two side clamping plates connected with the same upper pressing plate is provided with a tooth slot.

[0013] Optionally, the upper pressing plate front surface is fixed with a vertical frame, the vertical frame interior is slidably inserted with a sliding block, the sliding block back surface is rotationally connected with a gear, the gear upper and lower sides are engaged with tooth plates, and the ends of the two tooth plates away from the gear are respectively fixed with the two side clamping plates.

[0014] Optionally, the two power telescopic frames are provided with a plasma welding head, the plasma welding head is installed with a telescopic rotating control frame, and the telescopic rotating control frame upper end is slidably inserted in the adjacent side frame bottom surface.

[0015] In summary, the present application has the following beneficial technical effects:

[0016] 1. The present application is provided with horizontal plate, upper pressing plate and side clamping plate and other components, when the power telescopic frame is contracted, the horizontal frame is driven to move downward through the detachable support structure, the horizontal plate and the elastic telescopic frame are synchronously moved with the horizontal frame, the horizontal plate makes the two side clamping plates lower ends contact the two sides of the U-shaped rib plate in advance through the elastically connected upper pressing plate, then the two side clamping plates are gradually moved upward relative to the upper pressing plate under the rib plate blockage in the continuous downward movement of the horizontal frame, when the upper pressing plate moves downward and contacts the rib plate upper surface, the upper pressing plate compresses the rib plate upper surface, and at the same time, the two side clamping plates limit the two sides of the rib plate to prevent the rib plate from generating horizontal displacement in the welding.

[0017] 2. The present application is provided with tooth slot, hinged plate and tooth insertion plate and other components, when the upper pressing plate contacts the rib plate, the horizontal plate is gradually close to the upper pressing plate in the continuous downward movement of the horizontal plate, the hinged plate pushes the tooth insertion plate gradually away from the upper pressing plate axis, and after the tooth insertion plate is engaged with the tooth slot in the continuous movement, the position of the side clamping plate relative to the upper clamping plate is fixed, so that the side clamping plate can stably limit the two sides of the rib plate.

[0018] 3. The present application sets up a pull rope, a threaded cylinder, a fixed distance rope and an intermediate top plate and other components, the synchronous power telescopic rod controls the distance between the intermediate top plate and the threaded cylinder, before the rib plate is pressed and fixed, the power winding cylinder rotates the pull rope winding, the pull rope pulls the connected horizontal frame to move, in the horizontal frame away from the adjacent horizontal frame, the corresponding fixed distance rope is pulled out from the winding wheel surface to drive the connected threaded rod to rotate, the threaded cylinder gradually approaches the adjacent intermediate top plate through meshing with the threaded rod, when the threaded cylinder contacts with the intermediate top plate, the winding wheel stops rotating, the fixed distance rope is located at the distance limited from the winding wheel, thereby limiting the distance between the two adjacent horizontal frames, when the fixed distance rope between all horizontal frames is pulled out from the winding wheel, the distance between each two adjacent horizontal frames is limited, thereby the corresponding upper pressing plate and side clamping plate below apply uniform limitation to the rib plate, and the rib plate is uniformly stressed. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the overall structure schematic diagram in the embodiment of the present application;

[0020] Figure 2 is the top view structure schematic diagram in the embodiment of the present application;

[0021] Figure 3 is the structure schematic diagram of the side end top plate and the synchronous power telescopic rod connection in the embodiment of the present application;

[0022] Figure 4 is the structure schematic diagram of the horizontal frame and the side frame connection in the embodiment of the present application;

[0023] Figure 5 is the structure schematic diagram of the horizontal plate and the elastic telescopic frame connection in the embodiment of the present application; Figure 3 is the structure schematic diagram of the part A in the embodiment of the present application;

[0024] Figure 6 is the structure schematic diagram of the horizontal plate and the elastic telescopic frame connection in the embodiment of the present application;

[0025] Figure 7 is the part structure front view schematic diagram in the embodiment of the present application;

[0026] Figure 8 is the structure schematic diagram of the threaded rod and the threaded cylinder connection in the embodiment of the present application;

[0027] Figure 9 is the structure schematic diagram of the upper pressing plate and the side clamping plate connection in the embodiment of the present application.

[0028] Fig. 1 is a connecting bottom plate; 2 is a telescopic rotating control frame; 3 is a power telescopic frame; 4 is a detachable support structure; 41 is an end frame; 42 is a side frame; 421 is a middle top plate; 422 is a side end top plate; 423 is a bent telescopic rod A; 424 is a bent telescopic rod B; 425 is a synchronous power telescopic rod; 43 is a clamping block; 5 is a pressing structure; 51 is a cross frame; 52 is an elastic telescopic frame; 53 is a horizontal plate; 54 is an upper pressing plate; 541 is a toothed plug-in plate; 542 is a hinged plate; 543 is a toothed groove; 544 is a vertical frame; 545 is a gear; 546 is a sliding block; 547 is a toothed plate; 55 is a side clamping plate; 6 is a power winding drum; 7 is a pulling rope; 8 is a fixed distance rope; 9 is a winding wheel; 10 is a threaded rod; 11 is a track telescopic rod; 12 is a threaded drum; 13 is a steering wheel; 14 is a plasma welding head. DETAILED DESCRIPTION

[0029] The drawings will be described below Figures 1-9 The application will be further described.

[0030] The embodiment of the application discloses a steel structure rib plate welding device. Figures 1-9 As shown, it comprises two connecting bottom plates 1, the upper surfaces of the two connecting bottom plates 1 are both provided with power telescopic frames 3, the two power telescopic frames 3 are connected through two detachable support structures 4, the power telescopic frames 3 can control the distance between the upper ends of the power telescopic frames 3 and the connecting bottom plates 1 through power telescoping, the connecting bottom plates 1 are installed on both sides of the steel structure panel to be welded, and a plurality of pressing structures 5 are slidingly inserted between the two detachable support structures 4.

[0031] The pressing structure 5 comprises a cross frame 51 and an elastic telescopic frame 52, the upper end of the elastic telescopic frame 52 is fixed with the cross frame 51, and the two ends of the cross frame 51 are slidingly connected with the two detachable support structures 4 respectively.

[0032] The upper end of one of the two power telescopic frames 3 is rotatably connected with a power winding drum 6 away from the adjacent pressing structure 5, the circumferential side surface of the power winding drum 6 is wound with a pulling rope 7, the pulling rope 7 is slidingly penetrated through the upper end of the adjacent power telescopic frame 3, one end of the pulling rope 7 between the two power telescopic frames 3 is fixed with the adjacent cross frame 51, and the power winding drum 6 is provided with a motor, when the power winding drum 6 rotates, the pulling rope 7 can be wound, and the connected cross frame 51 can be moved.

[0033] The upper surface of the horizontal frame 51 is elastically connected with a winding wheel 9, the circumferential side of the winding wheel 9 is connected with a fixed distance rope 8, the lower end of the fixed distance rope 8 is slid through the upper surface of the horizontal frame 51 and then passes out from the front surface of the horizontal frame 51, the axis of the winding wheel 9 is fixed with a threaded rod 10, the outer surface of the threaded rod 10 is threadedly sleeved with a threaded cylinder 12, the lower surface of the threaded cylinder 12 is parallelly provided with a track telescopic rod 11, the two ends of the track telescopic rod 11 are respectively fixed with the adjacent lower horizontal frame 51 and the adjacent upper threaded cylinder 12, when the pull rope 7 pulls the horizontal frame 51 to move, the fixed distance rope 8 is gradually pulled out from the surface of the corresponding winding wheel 9, the winding wheel 9 is elastically stored and rotated relative to the horizontal frame 51, the connected threaded rod 10 is rotated, the threaded cylinder 12 is engaged with the rotating threaded rod 10 and gradually moves away from the threaded cylinder 12, when the horizontal frame 51 is not pulled by the pull rope 7, the winding wheel 9 stores the fixed distance rope 8.

[0034] The detachable support structure 4 includes two end frames 41 and multiple side frames 42, the ends of the two end frames 41 away from each other are respectively fixed with the upper ends of the two power telescopic frames 3, the ends of the two end frames 41 close to each other are respectively slidably connected with the adjacent side frames 42, the side frames 42 are slidably connected with the adjacent side frames 42, one end of the side frame 42 is a protruding plate structure, the other end of the side frame 42 is a groove structure, the end frame 41 and the connected side frame 42 and every two adjacent side frames 42 are detachably connected through a clamping block 43, according to the length of the welded panel, the number of the side frames 42 is controlled, and the distance between the two power telescopic frames 3 is changed.

[0035] The two power telescopic frames 3 are provided with a plasma welding head 14, the plasma welding head 14 is installed with a telescopic and rotatable control frame 2, the upper end of the telescopic and rotatable control frame 2 is slidably inserted into the bottom surface of the adjacent side frame 42, the two ends of the horizontal frame 51 are respectively slidably connected with the adjacent side frames 42, the end of the side frame 42 close to the horizontal frame 51 is a matched groove structure, the telescopic and rotatable control frame 2 can control the position of the plasma welding head 14, and the plasma welding head 14 is controlled to weld the rib plate and the steel structure panel.

[0036] The intermediate top plate 421 is arranged above each side frame 42 on the right side of the cross frame 51, the side end top plate 422 is arranged above each end frame 41 on the right side of the cross frame 51, the side end top plate 422 is in sliding connection with the adjacent intermediate top plate 421, the adjacent two intermediate top plates 421 are in sliding connection, one end of the intermediate top plate 421 is in protruding structure, the other end of the intermediate top plate 421 is in groove structure, the bending telescopic rod A 423 is fixed on the right side of the intermediate top plate 421, the other end of the bending telescopic rod A 423 is fixed with the adjacent lower side frame 42, the bending telescopic rod B 424 is fixed on the right side of the side end top plate 422, the other end of the bending telescopic rod B 424 is fixed with the adjacent lower end frame 41, the synchronous power telescopic rod 425 is fixed on the end of the two end frames 41 away from each other, the two synchronous power telescopic rods 425 are respectively fixed with the upper ends of the two power telescopic frames 3, the two synchronous power telescopic rods 425 are in telescopic state, and the distance between the intermediate top plate 421 and the threaded cylinder 12 is controlled through the side end top plate 422; when the threaded cylinder 12 contacts with the intermediate top plate 421, the winding wheel 9 stops rotating, the distance between the fixed distance rope 8 and the winding wheel 9 is limited, thereby the distance between the adjacent two cross frames 51 is limited, the distance between the fixed distance rope 8 and the winding wheel 9 is controlled by controlling the distance between the intermediate top plate 421 and the threaded cylinder 12, thereby the distance between the adjacent two cross frames 51 is controlled.

[0037] One of the two power telescopic frames 3 away from the power winding cylinder 6 is fixed with the adjacent fixed distance rope 8, the cross frame 51 is detachably connected with the adjacent rear fixed distance rope 8, the number of the cross frames 51 inserted between the front and rear side frames 42 can be changed, the steering wheel 13 is rotatably connected in the cross frame 51, the fixed distance rope 8 passes below the steering wheel 13, the lower end of the fixed distance rope 8 is horizontal, the upper end of the fixed distance rope 8 is vertical, and the steering wheel 13 limits the moving track of the fixed distance rope 8.

[0038] The horizontal plate 53 is fixed at the lower end of the elastic telescopic frame 52, the upper pressing plate 54 is arranged below the horizontal plate 53 and is elastically connected with the horizontal plate 53, the side clamping plates 55 are slidably inserted at the two ends of the upper pressing plate 54, the vertical frame 544 is fixed on the front of the upper pressing plate 54, the sliding block 546 is slidably inserted in the vertical frame 544, the gear wheel 545 is rotatably connected to the back of the sliding block 546, the toothed plates 547 are engaged with the upper and lower sides of the gear wheel 545, the two ends of the two toothed plates 547 away from the gear wheel 545 are respectively fixed with the two side clamping plates 55, the two side clamping plates 55 are in inverted V-shaped distribution, the side clamping plates 55 are slidably connected with the upper pressing plate 54, after the side clamping plates 55 are blocked by the rib plate, the side clamping plates 55 move relative to the upper pressing plate 54, the gear wheel 545 synchronously moves the two toothed plates 547 engaged therewith, the two side clamping plates 55 synchronously move relative to the upper pressing plate 54, and the two side clamping plates 55 limit the two side surfaces of the symmetrical rib plate.

[0039] The upper surface of the upper pressing plate 54 is slidingly inserted with the tooth insertion plate 541, and the side close to each other of the two tooth insertion plates 541 is rotationally connected with the hinged plate 542, the upper end of the hinged plate 542 is rotationally connected with the adjacent upper horizontal plate 53, and the side close to each other of the two side clamping plates 55 connected with the same upper pressing plate 54 is provided with the tooth groove 543, when the upper pressing plate 54 contacts with the upper surface of the rib plate, the horizontal plate 53 continues to move downwards, the horizontal plate 53 drives the hinged plate 542 to rotate by approaching the upper pressing plate 54, the hinged plate 542 drives the tooth insertion plate 541 to mesh with the tooth groove 543 when rotating, and the opposite side clamping plate 55 is fixed with the relative position of the upper pressing plate 54, so that the side clamping plate 55 stably limits the side surface of the rib plate.

[0040] The working principle is that the rib plate with welding is placed between the two connecting bottom plates 1, the connecting bottom plate 1 is installed on both sides of the steel structure to be welded, the rib plate is located below the upper pressing plate 54, the power telescopic frame 3 is retracted to drive the horizontal frame 51 to move downwards through the detachable supporting structure 4, the horizontal plate 53 and the elastic telescopic frame 52 move synchronously with the horizontal frame 51, the horizontal plate 53 drives the lower end of the two side clamping plates 55 to contact the two sides of the U-shaped rib plate through the elastically connected upper pressing plate 54, then the two side clamping plates 55 gradually move upwards relative to the upper pressing plate 54 under the block of the rib plate in the continuous downward movement of the horizontal frame 51, the two side clamping plates 55 apply pressure to the two sides of the rib plate, when the upper pressing plate 54 moves downwards and contacts with the upper surface of the rib plate, the upper pressing plate 54 presses the upper surface of the rib plate, and the rib plate can be stably welded.

[0041] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope of the present application.

Claims

1. A steel structure rib welding device, comprising a connecting base plate (1), characterized in that: There are two connecting base plates (1), and the upper surfaces of the two connecting base plates (1) are both installed with a power telescopic frame (3). The two power telescopic frames (3) are connected via two detachable support structures (4), and a plurality of pressing structures (5) are slidably inserted between the two detachable support structures (4); The pressing structure (5) includes a horizontal frame (51) and an elastic telescopic frame (52), the upper end of the elastic telescopic frame (52) is fixed to the horizontal frame (51), and the two ends of the horizontal frame (51) are respectively slidably connected to the two detachable support structures (4), and a horizontal plate (53) is fixed to the lower end of the elastic telescopic frame (52), and an upper pressing plate (54) is provided below the horizontal plate (53), and the upper pressing plate (54) is elastically connected to the horizontal plate (53), and side clamps (55) are slidably inserted at both ends of the upper pressing plate (54), and the two side clamps (55) are distributed in an inverted eight-shaped shape, and the side clamps (55) are slidably connected to the upper pressing plate (54); The upper end of one of the two power telescopic frames (3) is rotatably connected to a power drum (6) away from the adjacent pressing structure (5), and a pull rope (7) is wound around the circumferential side of the power drum (6). The pull rope (7) slides through the upper end of the adjacent power telescopic frame (3). The pull rope (7) is located between the two power telescopic frames (3) and is fixed to the adjacent cross frame (51). The upper surface of the cross frame (51) is elastically rotatably connected to a winding wheel (9). The winding wheel (9) is wound around the circumferential side and is connected to a fixed distance rope (8). The lower end of the fixed distance rope (8) slides through the upper surface of the cross frame (51) and then passes through the front of the cross frame (51). One of the two power telescopic frames (3) away from the power drum (6) is fixed to the adjacent fixed distance rope (8), and the cross frame (51) is detachably connected to the adjacent rear fixed distance rope (8). A threaded rod (10) is fixed at the axis of the winding wheel (9), a threaded barrel (12) is threadedly sleeved on the outer surface of the threaded rod (10), a track telescopic rod (11) is arranged parallel to the lower side of the threaded barrel (12), and the two ends of the track telescopic rod (11) are respectively fixed to the adjacent lower horizontal frame (51) and the adjacent upper threaded barrel (12); The detachable support structure (4) includes two end frames (41) and a plurality of side frames (42), the ends of the two end frames (41) that are away from each other are respectively fixed to the upper ends of the two power telescopic frames (3), the ends of the two end frames (41) that are close to each other are respectively slidably connected to the adjacent side frames (42), the side frames (42) are slidably connected to the adjacent side frames (42), one end of the side frame (42) is a protruding plate-shaped structure, and the other end of the side frame (42) is a groove-shaped structure. The end frame (41) and the connected side frame (42) and each adjacent two side frames (42) are detachably connected by a clamping block (43), the two ends of the cross frame (51) are respectively slidably connected to the adjacent side frames (42), and the end of the side frame (42) close to the cross frame (51) is a matching groove-shaped structure; An intermediate top plate (421) is provided above each side frame (42) on the right side of the cross frame (51), and a side end top plate (422) is provided above each end frame (41) on the right side of the cross frame (51). The side end top plate (422) is slidably connected to the adjacent intermediate top plate (421), and the two adjacent intermediate top plates (421) are slidably connected. One end of the intermediate top plate (421) is a convex structure, and the other end of the intermediate top plate (421) is a groove structure. The right side of the intermediate top plate (421) A bending telescopic rod A (423) is fixed, the other end of the bending telescopic rod A (423) is fixed to the adjacent lower side frame (42), a bending telescopic rod B (424) is fixed to the right side of the side end top plate (422), the other end of the bending telescopic rod B (424) is fixed to the adjacent lower end frame (41), and a synchronous power telescopic rod (425) is fixed to the ends of the two end frames (41) away from each other, and the two synchronous power telescopic rods (425) are respectively fixed to the upper ends of the two power telescopic frames (3).

2. A steel structure rib welding device according to claim 1, characterized in that: The cross frame (51) is internally rotatably connected to a steering wheel (13), and the distance rope (8) is passed around below the steering wheel (13). The lower end of the distance rope (8) is horizontal, and the upper end of the distance rope (8) is vertical.

3. A steel structure rib welding device according to claim 2, characterized in that: The upper surface of the upper pressing plate (54) is slidably connected to a toothed insert plate (541), and the two toothed insert plates (541) are rotatably connected to a hinge plate (542) on the sides close to each other. The upper end of the hinge plate (542) is rotatably connected to the adjacent upper horizontal plate (53), and the two side clamping plates (55) connected to the same upper pressing plate (54) are each provided with a toothed groove (543) on the sides close to each other.

4. A steel structure rib welding device according to claim 3, characterized in that: A vertical frame (544) is fixed on the front of the upper pressing plate (54), a slider (546) is slidably inserted inside the vertical frame (544), and a gear (545) is rotatably connected to the back of the slider (546). The gear (545) is meshed with tooth plates (547) on both the upper and lower sides. The ends of the two tooth plates (547) away from the gear (545) are respectively fixed to the two side clamping plates (55).

5. The steel structure rib welding device according to claim 2, characterized in that: A plasma welding head (14) is provided between the two power telescopic frames (3). The plasma welding head (14) is equipped with a telescopic and rotatable control frame (2). The upper end of the telescopic and rotatable control frame (2) is slidably plugged into the bottom surface of the adjacent side frame (42).

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