A welding auxiliary device for fabricated prefabricated steel structure

Abstract

This invention relates to the field of precast steel structure welding, specifically to a welding auxiliary device for assembled precast steel structures, comprising a welding auxiliary table and a control cabinet. The invention uses an open cylinder and an electric clamping seat to hold both ends of a component. A ring-shaped gear rail, composed of a notched toothed ring and an arc-shaped toothed ring, drives the component to rotate circumferentially via gear transmission. Combined with the lifting and swinging of the support seat, the welding support table always supports the weld area, adapting to rotational position shifts and maintaining the optimal welding posture for the weld. This eliminates the need for repeated disassembly and adjustment, solving the problem of full-circumference welding of irregularly shaped components and improving welding efficiency and weld quality. The device uses a transmission system composed of an electric push rod and a sliding seat, along with a connecting rod guide mechanism, to precisely control the height difference and deflection angle of the support seat. Pre-welding matching of the designed docking angle and mid-welding fine-tuning to offset welding thermal stress and suppress misalignment ensure welding accuracy and meet on-site assembly interchangeability requirements.

Description

Technical Field

[0001] This invention relates to the field of prefabricated steel structure welding, and more specifically to a welding auxiliary device for assembled prefabricated steel structures. Background Technology

[0002] Prefabricated steel structure welding auxiliary equipment refers to a complete set of mechanical tooling, special equipment and supporting accessories used in the assembly line welding production of prefabricated steel components such as steel columns, steel beams, steel supports, trusses, and box beams and columns in factories. It is suitable for pre-welding assembly and positioning, in-welding clamping and support, welding posture adjustment, welding deformation control, weld protection and operation assistance.

[0003] In patent application CN121670256A, published on March 17, 2026, entitled "A Welding Auxiliary Device for Prefabricated Steel Structures," this application discloses a welding auxiliary device for prefabricated steel structures, specifically relating to the field of welding technology. The device includes a machine base with clamping plates for holding steel beams fixedly mounted in a rectangular arrangement on its upper end. A welding auxiliary device conforming to the inner wall of the steel beam is disposed in the middle of the inner cavity of the outer shell. An electric winch and plasma welding equipment are disposed inside the control cabinet. Traction cables arranged in a rectangular pattern are disposed on both the front and rear sides of the inner cavity of the outer shell. This invention achieves precise internal and external clamping of the wing plate through the cooperation of the wing plate positioning structure and the wing plate clamping structure to prevent welding displacement. The precise calibration of the relative position of the wing plate and the main plate through the cooperation of the positioning drive structure and the crossbeam positioning structure ensures positional accuracy. The coordinated operation of each core structure improves welding quality and reduces errors. Simultaneously, it adapts to different specifications of H-shaped steel beams, greatly improving the versatility of the device, and effectively protects the surface integrity of the workpiece, achieving stable and efficient welding auxiliary operations throughout the entire process.

[0004] In the aforementioned patents or existing technologies, it is necessary to complete the butt welding of components with different inclination angles according to the overall building assembly plan. Moreover, the welds are often distributed on multiple circumferential surfaces of the components, and the welding posture needs to be adjusted by rotation to ensure the weld formation quality. However, most existing welding auxiliary devices can only be adapted to the straight butt clamping of straight components, and their circumferential rotation adjustment mechanisms are only designed for components with straight axes. When facing irregular steel components with butt angles, they cannot drive the components to complete circumferential rotation around their own axis, making it difficult to achieve continuous welding of multi-sided welds. Usually, multiple manual disassembly and re-alignment adjustments are required, which is not only inefficient but also prone to deviations in butt joint accuracy, making it difficult to meet the batch prefabrication requirements of diversified angle splicing of prefabricated steel structures.

[0005] Therefore, it is necessary to invent a welding auxiliary device for prefabricated steel structures to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a welding auxiliary device for prefabricated steel structures, which solves the problems of angular components being unable to be rotated circumferentially for welding and poor welding angle adaptability in the prior art by using an adjustable angle clamping mechanism in conjunction with a splicable rotary transmission structure.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a welding auxiliary device for prefabricated steel structures, comprising a welding auxiliary table and a control cabinet, wherein the control cabinet is installed on the side of the welding auxiliary table;

[0008] The lifting assembly installed on the surface of the welding auxiliary table includes: a through groove opened on the surface of the welding auxiliary table, and the through groove extends into the interior of the welding auxiliary table. A bearing seat 1 is installed in the through groove, and bearing seats 2 are symmetrically arranged on both sides of the bearing seat 1, and both sets of bearing seats 2 are connected through to the surface of the welding auxiliary table.

[0009] The power assembly installed inside the welding auxiliary table includes: a movable seat movably installed inside the welding auxiliary table, electric push rods two symmetrically installed above the movable seat, and the electric push rods two electrically connected to the control cabinet, and a connecting seat installed between the output ends of the two sets of electric push rods two;

[0010] The rotating assembly positioned above the first and second bearing seats includes: a welding bearing platform mounted above the first bearing seat; an open seat rotatably connected above each of the two sets of second bearing seats; an open cylinder rotatably connected within each of the two sets of open seats; and an electric clamping seat symmetrically installed within each of the two sets of open cylinders, with the electric clamping seat electrically connected to the control cabinet.

[0011] As a preferred embodiment of the present invention, a sliding seat is symmetrically and rotatably connected to the lower part of the bearing seat, and the lower part of the sliding seat is fixedly connected to the connecting seat. Both sets of bearing seats are rotatably connected to the lower part of the sliding seat.

[0012] As a preferred embodiment of the present invention, a connecting rod is provided between each of the two sets of sliding seats one and the adjacent sliding seat two, and the surfaces of the two sets of connecting rods are symmetrically provided with sliding grooves, and the sliding grooves are slidably connected to the corresponding sliding seats one and sliding seats two.

[0013] As a preferred embodiment of the present invention, both sets of connecting rods have sliding cavities on their surfaces, and both sets of sliding cavities are connected to limiting balls for movement, and the limiting balls are fixedly connected to the upper part of the inner wall of the welding auxiliary table.

[0014] As a preferred embodiment of the present invention, sliding rods are symmetrically installed on the lower part of the inner wall of the welding auxiliary table, and the two sets of sliding rods are slidably connected to the bottom of the movable seat.

[0015] As a preferred embodiment of the present invention, electric push rods are symmetrically installed between the two sides of the movable seat and the inner wall of the welding auxiliary table, and the installation direction of the electric push rods is parallel to the slide rod.

[0016] As a preferred embodiment of the present invention, a motor is installed in both sets of the open seats, and the motor is electrically connected to the control cabinet. The output ends of both sets of motors are shaft-connected with gears.

[0017] As a preferred embodiment of the present invention, a set of the open seat surfaces are fitted with notched toothed rings, the openings of the notched toothed rings coincide with the openings of the open seat, and the notched toothed rings mesh with the corresponding gears.

[0018] As a preferred embodiment of the present invention, a limiting groove is formed on the surface of another set of opening seats, and the limiting groove is located on both sides of the opening seat notch, and an arc-shaped toothed ring is slidably connected in the limiting groove on one side.

[0019] As a preferred embodiment of the present invention, a limiting bolt is installed on the side of the arc-shaped toothed ring near the notch of the opening seat.

[0020] Compared with the prior art, the technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0021] 1. The two sets of open cylinders with limited rotation in the open seats and the electric clamping seats rigidly clamp the two ends of the component. When the component is in an inclined docking angle, it can still be driven by the complete ring toothed rail formed by splicing the notched toothed ring and the arc toothed ring. The open cylinder drives the component with angle to rotate through the gear relay transmission of the motors on both sides. In this process, the swing of the moving seat and the lifting and lowering of the first and second bearing seats are coordinated so that the welding bearing table can always bear the weld, meet the offset fit of the irregular steel structure during the rotation process, and keep the circumferential weld in the optimal welding posture. There is no need for manual repeated disassembly and correction of the component. It effectively solves the pain point that it is difficult to weld the entire circumference of the irregular steel structure with oblique joints and corners, and improves the welding operation efficiency and weld formation quality.

[0022] 2. The power transmission system consisting of electric push rod one, electric push rod two, and the moving seat, combined with the linkage guide and limiting mechanism consisting of connecting rod, slide groove, and limiting ball, can precisely control the vertical height difference and deflection angle between bearing seat one and bearing seat two. Before welding, the design docking angle of the components can be accurately matched. During welding, the welding thermal stress and shrinkage deformation can be offset by fine-tuning the posture, suppressing the angular deviation and docking misalignment of the components caused by stress release, effectively ensuring the welding accuracy of the prefabricated steel components and meeting the interchangeability requirements of the later on-site assembly. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

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

[0025] Figure 2 This is a schematic diagram of the notched toothed ring structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the arc-shaped toothed ring structure of the present invention;

[0027] Figure 4 This is a schematic diagram of the connection structure between the arc-shaped toothed ring and the open cylinder of the present invention;

[0028] Figure 5 This is a schematic diagram of the planing structure of the welding auxiliary table of the present invention;

[0029] Figure 6 This is a schematic diagram of the sliding seat structure of the present invention;

[0030] Figure 7 This is a schematic diagram of the planed structure of the connecting rod of the present invention;

[0031] Figure 8 This is a schematic diagram of the connecting rod structure of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 101. Welding auxiliary table; 102. Control cabinet; 002. Lifting assembly; 201. Through slot; 202. Bearing seat one; 203. Bearing seat two; 204. Sliding seat one; 205. Sliding seat two; 206. Connecting rod; 207. Slide groove; 208. Slide cavity; 209. Limiting ball; 003. Power assembly; 301. Slide rod; 302. Moving seat; 303. Electric push rod one; 304. Electric push rod two; 305. Connecting seat; 004. Rotating assembly; 401. Welding bearing table; 402. Opening seat; 403. Opening cylinder; 404. Electric clamping seat; 405. Motor; 406. Gear; 407. Notched toothed ring; 408. Limiting groove; 409. Arc-shaped toothed ring; 410. Limiting bolt. Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0035] This invention provides, for example Figure 1-8The welding auxiliary device for prefabricated steel structures shown includes a welding auxiliary table 101 and a control cabinet 102, with the control cabinet 102 installed on the side of the welding auxiliary table 101.

[0036] The lifting assembly 002 disposed on the surface of the welding auxiliary table 101 includes: a through groove 201 formed on the surface of the welding auxiliary table 101, and the through groove 201 extends into the interior of the welding auxiliary table 101. A first bearing seat 202 is disposed in the through groove 201, and second bearing seats 203 are symmetrically disposed on both sides of the first bearing seat 202. Both sets of second bearing seats 203 are connected through the surface of the welding auxiliary table 101.

[0037] The power assembly 003 located inside the welding auxiliary table 101 includes: a movable seat 302 movably located inside the welding auxiliary table 101; electric push rods 304 are symmetrically mounted above the movable seat 302; the electric push rods 304 are electrically connected to the control cabinet 102; and a connecting seat 305 is installed between the output ends of the two sets of electric push rods 304.

[0038] The rotating assembly 004, located above the first bearing seat 202 and the second bearing seat 203, includes: a welding bearing platform 401 installed above the first bearing seat 202; an open seat 402 rotatably connected above each of the two sets of second bearing seats 203; an open cylinder 403 rotatably connected within each of the two sets of open seats 402; and an electric clamping seat 404 symmetrically installed within each of the two sets of open cylinders 403, and the electric clamping seat 404 is electrically connected to the control cabinet 102.

[0039] The three-point support structure is formed by the first bearing seat 202 and two sets of symmetrically arranged second bearing seats 203, providing stable support for the upper welding components. The power component 003 is built into the platform body and uses the movable seat 302 as the installation carrier. It drives the connecting seat 305 through the electric push rod 304 to output vertical power, providing power support for lifting and adjustment. This allows the first bearing seat 202 to rise and the second bearing seats 203 on both sides to fall, thus adjusting the angle. At the same time, it can also ensure that stress is not generated during welding on one side, which would cause the angle to change. The rotating component 004 supports the docking area of ​​the component with the welding bearing platform 401. The two side opening seats 402 and the opening cylinder 403 form a rotatable clamping unit. In conjunction with the electric clamping seat 404, it rigidly clamps the end of the prefabricated steel component, which can drive the overall circumferential rotation of the irregular steel component to adjust the welding angle, adapting to the diverse oblique joint and corner splicing requirements of prefabricated steel structures.

[0040] Furthermore, in the above structure, a sliding seat 204 is symmetrically rotatably connected below the bearing seat 202, and the sliding seat 204 is fixedly connected to the connecting seat 305 below. Sliding seats 205 are rotatably connected below both sets of bearing seats 203.

[0041] The sliding seat 204 is symmetrically rotatably connected below the bearing seat 202, and the sliding seat 204 is fixedly connected to the connecting seat 305. This allows the lifting power of the connecting seat 305 to be stably transmitted to the bearing seat 202. The rotatable connection design can adapt to the attitude deflection of the bearing seat 202 during angle adjustment. At the same time, the sliding seat 205 is rotatably connected below both sets of bearing seats 203, so that the bearing seats 203 can adaptively rotate with the change of component angle, avoiding structural jamming during lifting and angle adjustment, and ensuring the continuity of action.

[0042] Furthermore, in the above structure, a connecting rod 206 is provided between each of the two sets of sliding seats 204 and the adjacent sliding seat 205. The surfaces of the two sets of connecting rods 206 are symmetrically provided with sliding grooves 207, and the sliding grooves 207 are slidably connected to the corresponding sliding seats 204 and sliding seats 205.

[0043] By sliding the first sliding seat 204 and the second sliding seat 205 in slidable engagement with the corresponding sliding groove 207, the synchronous movement of the two bearing seats can be ensured by the connecting rod 206, avoiding left and right offset when the components are connected. The sliding groove 207 can also constrain the sliding trajectory of the sliding seats, so that the first bearing seat 202 and the second bearing seat 203 move along a predetermined path during lifting and angle deflection, thereby improving the stability of the structure and the connection accuracy.

[0044] Furthermore, in the above structure, both sets of connecting rods 206 have sliding cavities 208 on their surfaces, and both sets of sliding cavities 208 are connected to limiting balls 209 in a limited manner, and the two sets of limiting balls 209 are fixedly connected to the upper part of the inner wall of the welding auxiliary table 101.

[0045] By using the limit ball 209 in conjunction with the sliding cavity 208, the swing amplitude and lifting stroke of the connecting rod 206 are doubly limited, preventing excessive movement of the connecting rod 206 from causing structural derailment or component overturning. At the same time, it can provide auxiliary support for the connecting rod 206, improving the overall structure's anti-sway performance and operational reliability during lifting and adjustment.

[0046] Furthermore, in the above structure, slide rods 301 are symmetrically installed on the lower inner wall of the welding auxiliary table 101, and the two sets of slide rods 301 are slidably connected to the bottom of the movable seat 302.

[0047] The sliding rod 301 forms a sliding fit with the movable seat 302, providing precise linear guidance for the horizontal sliding of the movable seat 302, avoiding deviation or jamming during the movement of the movable seat 302, ensuring the straightness and stability of the horizontal power transmission, and thus ensuring the transmission accuracy of the angle adjustment of the upper component.

[0048] Furthermore, in the above structure, electric push rods 303 are symmetrically installed between the two sides of the movable seat 302 and the inner wall of the welding auxiliary table 101, and the installation direction of the electric push rods 303 is parallel to that of the slide rod 301.

[0049] The electric push rod 303 is arranged parallel to the slide rod 301. The electric push rod 303 provides a horizontal driving force to the moving seat 302, which pushes the moving seat 302 to translate along the slide rod 301. Then, through the linkage structure, the upper bearing seat and the clamped component are driven to complete the angular deflection. The parallel arrangement makes the direction of the thrust consistent with the direction of movement, which can effectively improve the transmission efficiency and reduce power loss and structural wear.

[0050] Furthermore, in the above structure, motors 405 are installed in both sets of open seats 402, and motors 405 are electrically connected to control cabinet 102. Gears 406 are shaft-connected to the output ends of both sets of motors 405.

[0051] Torque is transmitted outward through gear 406, providing a power source for the circumferential rotation of open cylinder 403, enabling precise electric adjustment of the component welding angle. This eliminates the need for manual rotation of the component, reducing operational difficulty and safety risks, and improving the efficiency and accuracy of angle adjustment.

[0052] Furthermore, in the above structure, a set of open seats 402 are mounted with notched toothed rings 407, and the opening of the notched toothed rings 407 coincides with the opening of the open seats 402, and the notched toothed rings 407 mesh with the corresponding gears 406.

[0053] The notched gear ring 407's opening coincides with the opening of the opening seat 402 and meshes with the corresponding gear 406 to form a transmission. On the one hand, the rotational power of the motor 405 can be stably transmitted to the opening cylinder 403, causing the clamped steel component to rotate at a constant speed around the axis and adjust the circumferential position of the weld. On the other hand, the notch design corresponds to the side openings of the opening seat 402 and the opening cylinder 403, which facilitates the rapid loading and unloading of prefabricated steel components from the side, greatly improving the efficiency of loading and unloading operations and adapting to the production rhythm of batch prefabrication of assembled components.

[0054] Furthermore, in the above structure, a limiting groove 408 is formed on the surface of another set of opening seats 402, and the limiting groove 408 is located on both sides of the notch of the opening seat 402, and an arc-shaped toothed ring 409 is slidably connected in one limiting groove 408.

[0055] An arc-shaped toothed ring 409 is slidably installed within a single-sided limiting groove 408. The limiting groove 408 provides circumferential sliding guidance and radial limiting for the arc-shaped toothed ring 409. The arc-shaped toothed ring 409 can slide along the limiting groove 408 to adjust its circumferential position, thereby covering the open cylinder 403. This allows the arc-shaped toothed ring 409 and the notched toothed ring 407 to form a circle, enabling both large-angle electric rotation of the component and small-range fine-tuning and locking through the arc-shaped toothed ring 409, adapting to the precise positioning requirements of different welding angles.

[0056] Furthermore, in the above structure, a limiting bolt 410 is installed on the side of the arc-shaped toothed ring 409 near the notch of the open seat 402.

[0057] A limiting bolt 410 is installed on the side of the arc-shaped toothed ring 409 near the notch of the open seat 402. When the arc-shaped toothed ring 409 slides into the opposite limiting groove 408, the arc-shaped toothed ring 409 can be locked and fixed inside by tightening the limiting bolt 410. At this time, the position of the arc-shaped toothed ring 409 and the notched toothed ring 407 form a circle. Through the relay cooperation with the two sets of gears 406, the entire component is driven to rotate.

[0058] like Figure 1-8 As shown, the operation of each electric actuator is uniformly controlled by the control cabinet 102. During operation, the prefabricated steel component to be welded is first placed into the two opening cylinders 403 on both sides using the side opening structure of the opening seat 402 and the opening cylinder 403. The mating area in the middle of the component is supported above the welding support table 401. The control cabinet 102 controls the electric clamping seats 404 in the two sets of opening cylinders 403 to move synchronously, clamping the ends of the component symmetrically from both sides to complete the clamping and positioning of the component. At the same time, the sliding arc-shaped toothed ring 409 is locked by the limit bolt 410.

[0059] When the tilt angle of the component needs to be adjusted, the control cabinet 102 controls the electric push rod 304 to extend and retract. The electric push rod 304 drives the connecting seat 305 to drive the bearing seat 202 through the sliding seat 204. At the same time, the sliding seat 204 and the adjacent sliding seat 205 slide relative to each other along the groove 207 on the surface of the connecting rod 206, so that the bearing seat 202 and the two sets of bearing seats 203 form a vertical height difference and angle deflection, thereby driving the clamped precast steel component to deflect to the target welding angle. During the above angle and height adjustment process, the connecting rod 206 cooperates with the limiting ball 209 fixed above the inner wall of the welding auxiliary table 101 through the sliding cavity 208 on its surface, and swings and slides synchronously with the movement of the linkage mechanism, constraining the movement trajectory of the entire linkage transmission mechanism.

[0060] When the circumferential welding angle of a component needs to be adjusted, the control cabinet 102 controls the motor 405 to start running. The gear 406 connected to the output shaft of the motor 405 meshes with the notched gear ring 407, driving the open cylinder 403 to rotate circumferentially within the open seat 402, thereby driving the clamped steel component to rotate around its own axis and adjusting the circumferential welding position of the weld. With continuous rotation, the arc-shaped gear ring 409 and the notched gear ring 407 splice to form a complete annular gear track. The motors 405 on both sides drive the gears 406 to mesh in relay, which drives the open cylinder 403 to drive the component to complete the full circumferential rotation, realizing the adjustment of the welding posture of the weld at all angles. During this process, the electric push rod 303 can drive the moving seat 302 to move, so that the bearing seat 202 rotates with the irregular steel structure, thereby sliding along the through groove 201, thus meeting the positional fit deviation requirements of the angled structure during rotation.

[0061] After all angles and heights are adjusted to the correct position, each actuator remains locked, and welding operations can be carried out in the component docking area. After welding is completed, the electric clamping seat 404 is released, and the component is taken out from the side opening of the opening seat 402, completing a single welding auxiliary operation cycle.

[0062] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A welding auxiliary device for prefabricated steel structures, comprising a welding auxiliary table (101) and a control cabinet (102), wherein the control cabinet (102) is mounted on the side of the welding auxiliary table (101), characterized in that: The lifting assembly (002) disposed on the surface of the welding auxiliary table (101) includes: a through groove (201) opened on the surface of the welding auxiliary table (101), and the through groove (201) extends into the interior of the welding auxiliary table (101), a bearing seat (202) is disposed in the through groove (201), and bearing seats (203) are symmetrically disposed on both sides of the bearing seat (202), and both sets of bearing seats (203) are connected through to the surface of the welding auxiliary table (101); The power assembly (003) located inside the welding auxiliary table (101) includes: a movable seat (302) movably located inside the welding auxiliary table (101), electric push rods (304) symmetrically mounted above the movable seat (302), and the electric push rods (304) electrically connected to the control cabinet (102), and a connecting seat (305) installed between the output ends of the two sets of electric push rods (304); The rotating assembly (004) disposed above the first bearing seat (202) and the second bearing seat (203) includes: a welding bearing platform (401) installed above the first bearing seat (202), an open seat (402) rotatably connected above each of the two sets of second bearing seats (203), an open cylinder (403) rotatably connected within each of the two sets of open seats (402), an electric clamping seat (404) symmetrically installed within each of the two sets of open cylinders (403), and the electric clamping seat (404) is electrically connected to the control cabinet (102).

2. The welding auxiliary device for prefabricated steel structures according to claim 1, characterized in that: The first bearing seat (202) is symmetrically rotatably connected to the first sliding seat (204) below, and the first sliding seat (204) is fixedly connected to the connecting seat (305) below. The second bearing seat (203) of both sets is rotatably connected to the second sliding seat (205) below.

3. The welding auxiliary device for prefabricated steel structures according to claim 2, characterized in that: A connecting rod (206) is provided between each of the two sets of sliding seats one (204) and the adjacent sliding seat two (205). The surfaces of the two sets of connecting rods (206) are symmetrically provided with sliding grooves (207), and the sliding grooves (207) are slidably connected to the corresponding sliding seats one (204) and sliding seats two (205).

4. The welding auxiliary device for prefabricated steel structures according to claim 3, characterized in that: Both sets of connecting rods (206) have sliding cavities (208) on their surfaces, and both sets of sliding cavities (208) are connected to limiting balls (209) inside, and the two sets of limiting balls (209) are fixedly connected to the upper part of the inner wall of the welding auxiliary table (101).

5. A welding auxiliary device for prefabricated steel structures according to claim 1, characterized in that: The welding auxiliary table (101) is symmetrically equipped with slide rods (301) on the lower inner wall, and the two sets of slide rods (301) are slidably connected to the bottom of the movable seat (302).

6. A welding auxiliary device for prefabricated steel structures according to claim 5, characterized in that: Electric push rods (303) are symmetrically installed on both sides of the movable seat (302) and the inner wall of the welding auxiliary table (101), and the installation direction of the electric push rods (303) is parallel to the slide rod (301).

7. A welding auxiliary device for prefabricated steel structures according to claim 1, characterized in that: Both sets of open seats (402) are equipped with motors (405), and the motors (405) are electrically connected to the control cabinet (102). The output ends of both sets of motors (405) are connected to gears (406).

8. A welding auxiliary device for prefabricated steel structures according to claim 7, characterized in that: A notched toothed ring (407) is mounted on the surface of a set of opening seats (402), and the opening of the notched toothed ring (407) coincides with the opening of the opening seat (402), and the notched toothed ring (407) meshes with the corresponding gear (406).

9. A welding auxiliary device for prefabricated steel structures according to claim 8, characterized in that: Another set of opening seats (402) has a limiting groove (408) on its surface, and the limiting groove (408) is located on both sides of the notch of the opening seat (402). An arc-shaped toothed ring (409) is slidably connected in the limiting groove (408) on one side.

10. A welding auxiliary device for prefabricated steel structures according to claim 9, characterized in that: The arc-shaped toothed ring (409) is fitted with a limit bolt (410) on the side near the notch of the opening seat (402).

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