Steel structure welding heavy assembly supporting platform

Abstract

The utility model discloses a steel structure welding heavy assembly supporting platform and relates to the field of steel structure bridge machining and manufacturing. The steel box girder jig frame solves the problems that an existing steel box girder jig frame is low in production efficiency, large in material waste and high in production cost. Two guide rails which are arranged side by side are respectively arranged on two sides of the upper end of a base, a plurality of supporting plates are sequentially arranged above the two guide rails from front to back, two sides of the bottom of each supporting plate are respectively connected with the two guide rails in a sliding mode through a plurality of sliding blocks, and a supporting system is respectively arranged on the upper portion of each supporting plate. The two lifting mechanisms are symmetrically installed at the upper end of the supporting plate, the bottom end of each supporting column is connected with the output end of the corresponding lifting mechanism, the two ends of the triangular supporting frame are connected with the top ends of the two supporting columns respectively, a driving system is arranged between the two lifting mechanisms, and the output end of the driving system is connected with the input ends of the two lifting mechanisms respectively. The welding position adjusting device is used for rapidly adjusting the welding position and can be repeatedly used according to steel box girders of different models.

Description

Technical Field

[0001] The utility model relates to the field of steel structure bridge processing and manufacturing, and particularly relates to a heavy assembly support platform for steel structure welding. Background Technique

[0002] A steel box girder is a structure with a hollow interior and flanges on both sides. Steel box girders often serve as beams in long-span bridges. A steel box girder is composed of a top plate, a bottom plate, webs, transverse and longitudinal diaphragms, and stiffeners through full welding, and is generally processed in a factory and then transported to the site for installation.

[0003] However, when welding a steel box girder, due to transportation and convenience for inspection, etc., it needs to be placed on a jig first and then welded. Since the bottom of the steel box girder has a certain curvature, the jig needs to be processed so that the steel box girder can be in a specified welding position when placed on the jig.

[0004] At present, the treatment method of the traditional steel box girder jig for this problem is only to weld steel pipes with different lengths at different points to meet the position requirements for welding. However, this method cannot be adjusted in real time, and when welding the next group of steel box girders, the steel pipes need to be knocked off completely and re-arranged, resulting in low production efficiency, large material waste, and high production cost. Content of the Utility Model

[0005] The purpose of the utility model is to solve the problems of low production efficiency, large material waste, and high production cost existing in the existing steel box girder jig, and further provide a heavy assembly support platform for steel structure welding.

[0006] The technical solution of the utility model is as follows:

[0007] A heavy-duty assembly support platform for steel structure welding, which comprises a plurality of ground rail platforms 4, a plurality of drive systems 2 and a plurality of support systems 3. The plurality of ground rail platforms 4 are arranged side by side on the horizontal ground. Each ground rail platform 4 includes a base 41, two guide rails 42, a plurality of sliders 43 and a plurality of support plates 44. The base 41 is horizontally arranged along the length direction of the steel box girder to be supported. On both sides of the upper end of the base 41, two guide rails 42 arranged side by side along the length direction of the base 41 are respectively provided. A plurality of support plates 44 are sequentially arranged above the two guide rails 42 from front to back. On both sides of the bottom of each support plate 44, they are respectively slidably connected to the two guide rails 42 through a plurality of sliders 43. On the upper part of each support plate 44, a support system 3 is respectively provided. Each support system 3 includes a triangular support frame 35, two lifting mechanisms 31 and two support columns 32. The two lifting mechanisms 31 are symmetrically installed on the upper end of the support plate 44 with the midline of the support plate 44 as the center. The two support columns 32 are arranged above the two lifting mechanisms 31. The bottom end of each support column 32 is connected to the output end of the corresponding lifting mechanism 31. Both ends of the triangular support frame 35 are respectively connected to the top ends of the two support columns 32. A drive system 2 is provided between the two lifting mechanisms 31. The output end of the drive system 2 is respectively connected to the input ends of the two lifting mechanisms 31.

[0008] Further, the base 41 includes two C-shaped steels 411, two rectangular steel beams 412, two seat plates 413, a plurality of cross beams 414 and a plurality of anchor connecting plates 415. The two C-shaped steels 411 are arranged horizontally and oppositely side by side. The two rectangular steel beams 412 are respectively installed in parallel on the tops of the two C-shaped steels 411. The two seat plates 413 are respectively installed horizontally on the tops of the two rectangular steel beams 412. On the bottom of each C-shaped steel 411, a plurality of anchor connecting plates 415 are sequentially installed from front to back along the length direction. The anchor connecting plates 415 are connected to the horizontal ground through long screws. Between the two C-shaped steels 411, cross beams 414 are evenly arranged from front to back along the length direction. Both ends of the cross beam 414 are respectively welded and connected to the two C-shaped steels 411 and the inner side walls of the two rectangular steel beams 412.

[0009] Further, each ground rail platform 4 further includes a plurality of locking bolts 45. Locking threaded holes are provided on the support plate 44. The locking threaded holes are vertically connected to the upper end surface of the seat plate 413. The plurality of locking bolts 45 are respectively screwed and installed into the plurality of locking threaded holes from outside to inside. The distance between the lower end surface of the support plate 44 and the upper end surface of the seat plate 413 is less than the screw length of the locking bolt 45.

[0010] Further, each support system 3 further includes an inclined support 34. The inclined support 34 is of an X-shaped structure. The inclined support 34 is vertically arranged between the two support columns 32. Both ends of the inclined support 34 are respectively connected to the outer side walls of the two support columns 32.

[0011] Further, each support system 3 further includes a top support cap 33 and a universal damping ball head 36. A horizontal mounting surface is machined at the top end of the triangular support frame 35. The universal damping ball head 36 is mounted on the horizontal mounting surface of the triangular support frame 35. A ball head connection threaded hole is machined at the center of the bottom end of the top support cap 33. The top screw of the universal damping ball head 36 is threadedly connected to the top support cap 33.

[0012] Further, the lifting mechanism 31 is a nut lifter. The nut lifter includes a turbine housing, a worm housing, a turbine, a worm, a vertical lead screw 312, a connecting nut, and a support nut 311. A turbine is rotatably mounted inside the turbine housing coaxially. A nut mounting hole is opened at the center of the turbine end face. A connecting nut is rotatably mounted in the nut mounting hole. The connecting nut is helically mounted on the vertical lead screw 312. A support nut 311 is helically mounted on the upper part of the vertical lead screw 312. An end flange is provided at the lower end of the support nut 311. The support column 32 is a hollow tubular structure. The support column 32 is sleeved on the upper part of the corresponding vertical lead screw 312. The lower end of the support column 32 is connected to the end flange by a plurality of connecting screws. A transverse notch is opened at the side of the turbine housing. A worm housing is connected at the transverse notch. A worm is rotatably mounted inside the worm housing coaxially. The worm meshes with the turbine.

[0013] Further, the drive system 2 includes a gear reduction motor 21, a steering gear 24, three linkage shafts 23, and six couplings 22. The worms in the two nut lifters on each support plate 44 are coaxially arranged. A steering gear 24 is provided between the two nut lifters. The two ends of the two worms are respectively connected to one end of the two linkage shafts 23 through the two couplings 22. The other ends of the two linkage shafts 23 are respectively connected to the two output shafts of the steering gear 24 through the two couplings 22. A gear reduction motor 21 is provided at the side of the steering gear 24. The input shaft of the steering gear 24 is connected to one end of another linkage shaft 23 through a coupling 22. The other end of the linkage shaft 23 is connected to the rotating shaft of the gear reduction motor 21 through a coupling 22.

[0014] Further, the steering gear 24 is a right-angle spiral bevel gear commutator. The right-angle spiral bevel gear commutator includes a gear box, an input shaft, a driving bevel gear, two output shafts, and two driven bevel gears. The input shaft is rotatably mounted on the rear side wall of the gear box. One end of the input shaft is located outside the gear box, and the other end of the input shaft is located inside the gear box. The driving bevel gear is mounted at the end of the input shaft located inside the gear box. The driving bevel gear meshes with the two driven bevel gears on both sides. The two driven bevel gears are respectively mounted at one end of the two output shafts. The other ends of the two output shafts are respectively rotatably mounted on the left and right side walls of the gear box.

[0015] The utility model has the following effects compared with the prior art:

[0016] 1. The heavy-duty assembly support platform for steel structure welding of the present utility model can be arbitrarily adjusted to the required height by the up and down movement of the SWL screw jack, and thus can adapt to different models of steel box girders. It has strong versatility and flexibility, is easy to operate, can be reused repeatedly, does not waste materials, effectively improves the welding efficiency, and reduces the production cost.

[0017] 2. The heavy-duty assembly support platform for steel structure welding of the present utility model can achieve stable support during the steel structure welding process by intelligently adjusting the support height, improve the work efficiency and welding quality, and reduce the waste of steel.

[0018] 3. When welding the steel box girder, the number of the ground rail platforms of the present utility model is two, and the two ground rail platforms are horizontally arranged side by side along the length direction of the steel box girder on the ground to jointly support the steel box girder. A ground rail platform is arranged between the support system of this platform and the ground, which is convenient for adjusting the relative position between the support system and the steel box girder. Compared with the traditional steel box girder support system directly fixed on the ground, the installation and adjustment process is simplified, and the work efficiency is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is the structural schematic diagram of the heavy-duty assembly support platform for steel structure welding of the present utility model;

[0020] Figure 2 is the exploded view of the support system in the heavy-duty assembly support platform for steel structure welding of the present utility model;

[0021] Figure 3 is the axonometric view after the assembly of the support system and the ground rail platform in the heavy-duty assembly support platform for steel structure welding of the present utility model;

[0022] Figure 4 is Figure 3 the partial enlarged view at A;

[0023] Figure 5 is Figure 3 the partial enlarged view at B;

[0024] Figure 6 is the drive system in the heavy-duty assembly support platform for steel structure welding of the present utility model;

[0025] Figure 7 is the exploded view of the lifting mechanism and the support column in the heavy-duty assembly support platform for steel structure welding of the present utility model.

[0026] In the figure:

[0027] 1. Total controller; 2. Drive system; 3. Support system; 4. Ground rail platform;

[0028] 21. Gear reduction motor; 22. Coupling; 23. Linkage shaft; 24. Steering gear;

[0029] 31. Lifting mechanism; 32. Support column; 33. Top support cap; 34. Oblique support; 35. Triangular support frame; 36. Universal damping ball head;

[0030] 311. Support nut; 312. Vertical lead screw;

[0031] 41. Base; 42. Guide rail; 43. Slide block; 44. Support plate; 45. Locking bolt;

[0032] 411. C-shaped steel; 412. Rectangular steel beam; 413. Seat plate; 414. Cross beam; 415. Anchor connecting plate. Detailed implementation mode

[0033] Detailed implementation mode one: In combination with Figures 1 to 7 This detailed implementation mode is described. A heavy-duty assembly support platform for steel structure welding in this detailed implementation mode includes a plurality of ground rail platforms 4, a plurality of drive systems 2, and a plurality of support systems 3. The plurality of ground rail platforms 4 are arranged side by side on the horizontal ground. Each ground rail platform 4 includes a base 41, two guide rails 42, a plurality of slide blocks 43, and a plurality of support plates 44. The base 41 is horizontally arranged along the length direction of the steel box girder to be supported. On both sides of the upper end of the base 41, two guide rails 42 arranged side by side along the length direction of the base 41 are respectively provided. A plurality of support plates 44 are sequentially arranged above the two guide rails 42 from front to back. The two sides of the bottom of each support plate 44 are respectively slidably connected to the two guide rails 42 through a plurality of slide blocks 43. Above each support plate 44, a support system 3 is respectively provided. Each support system 3 includes a triangular support frame 35, two lifting mechanisms 31, and two support columns 32. The two lifting mechanisms 31 are symmetrically installed at the upper end of the support plate 44 with the center line of the support plate 44 as the center. The two support columns 32 are arranged above the two lifting mechanisms 31. The bottom end of each support column 32 is connected to the output end of the corresponding lifting mechanism 31. Both ends of the triangular support frame 35 are respectively connected to the top ends of the two support columns 32. A drive system 2 is provided between the two lifting mechanisms 31. The output end of the drive system 2 is respectively connected to the input ends of the two lifting mechanisms 31.

[0034] Among them, the drive system 2 is used to drive the support nut 311 in the SWL screw jack to move up and down.

[0035] Detailed implementation mode two: In combination with Figures 1 to 7To describe this embodiment, the base 41 of this embodiment includes two C-shaped steel beams 411, two rectangular steel beams 412, two seat plates 413, a plurality of cross beams 414 and a plurality of anchor connecting plates 415. The two C-shaped steel beams 411 are arranged side by side horizontally and oppositely. The two rectangular steel beams 412 are respectively installed in parallel on the tops of the two C-shaped steel beams 411. The two seat plates 413 are respectively installed horizontally on the tops of the two rectangular steel beams 412. A plurality of anchor connecting plates 415 are respectively installed on the bottom of each C-shaped steel beam 411 in sequence from front to back along the length direction. The anchor connecting plates 415 are connected to the horizontal ground by long screws. A plurality of cross beams 414 are arranged in sequence from front to back along the length direction between the two C-shaped steel beams 411. The two ends of the cross beam 414 are respectively welded and connected to the two C-shaped steel beams 411 and the inner side walls of the two rectangular steel beams 412. Other components and connection relationships are the same as those in the first specific embodiment.

[0036] Specific embodiment three: In combination with Figures 1 to 7 To describe this embodiment, each ground rail platform 4 of this embodiment further includes a plurality of locking bolts 45. The support plate 44 is provided with a plurality of locking threaded holes, and the locking threaded holes are vertically connected to the upper end surface of the seat plate 413. A plurality of locking bolts 45 are respectively screwed into the plurality of locking threaded holes from outside to inside. The distance between the lower end surface of the support plate 44 and the upper end surface of the seat plate 413 is less than the screw length of the locking bolt 45. With such a setting, during construction, the operator screws the locking bolt outwards until the end of the locking bolt is separated from the base, and manually pushes the support plate so that the slider slides on the guide rail until the top support cap moves to a suitable position directly below the steel box girder. Then the operator screws the locking bolt inwards until the end of the locking bolt abuts against the base, thereby realizing the fixation between the support plate and the base. Other components and connection relationships are the same as those in the first or second specific embodiment.

[0037] Specific embodiment four: In combination with Figures 1 to 7 To describe this embodiment, each support system 3 of this embodiment further includes an inclined support 34. The inclined support 34 is of an X-shaped structure. The inclined support 34 is vertically arranged between the two support columns 32, and the two ends of the inclined support 34 are respectively connected to the outer side walls of the two support columns 32. With such a setting, the inclined support 34 is welded by steel pipes and is fixed to the adjacent two support columns 32 by welding. Other components and connection relationships are the same as those in the first, second or third specific embodiment.

[0038] Specific embodiment five: In combination with Figures 1 to 7To describe this embodiment, each support system 3 of this embodiment further includes a top support cap 33 and a universal damping ball head 36. A horizontal mounting surface is machined at the top end of the triangular support frame 35. The universal damping ball head 36 is mounted on the horizontal mounting surface of the triangular support frame 35. A ball head connection threaded hole is machined at the center of the bottom end of the top support cap 33. The top screw of the universal damping ball head 36 is threadedly connected to the top support cap 33. With such a setting, a universal damping ball head is provided between the top support cap and the triangular support frame of this platform, improving the adaptability of the platform to the shape of the steel box girder and making the top support cap more suitable for the steel box girder. The top support cap 33 and the universal damping ball head 36 are connected by a threaded connection, which facilitates the disassembly and installation of the two. The top support cap 33 is used to directly contact and bear the steel box girder. Other compositions and connection relationships are the same as those in the first, second, third, or fourth specific embodiments.

[0039] Among them, the universal damping ball head 36 adopts a metal universal damping ball head bracket with the product model ZN-QT-002-T.

[0040] Among them, the top support cap 33 and the universal damping ball head 36 can also be connected by welding.

[0041] Specific embodiment six: Combine Figures 1 to 7 To describe this embodiment, the lifting mechanism 31 of this embodiment is a nut lifter. The nut lifter includes a turbine housing, a worm housing, a turbine, a worm, a vertical lead screw 312, a connecting nut, and a support nut 311. A coaxially arranged turbine is rotatably installed inside the turbine housing. A nut installation hole is opened at the center of the turbine end face. A connecting nut is rotatably installed in the nut installation hole. The connecting nut is helically installed on the vertical lead screw 312. A support nut 311 is helically installed on the upper part of the vertical lead screw 312. An end flange is provided at the lower end of the support nut 311. The support column 32 is a hollow tubular structure. The support column 32 is sleeved on the upper part of the corresponding vertical lead screw 312. The lower end of the support column 32 is connected to the end flange by a plurality of connecting screws. A horizontal notch is opened on the side of the turbine housing. A worm housing is connected at the horizontal notch. A coaxially arranged worm is rotatably installed inside the worm housing. The worm meshes with the turbine. With such a setting, when the gear reduction motor 21 drives the vertical lead screw 312 to rotate, the support nut 311 threadedly connected to the vertical lead screw 312 realizes up and down lifting movement under the restriction of the support column 32 and the support nut 311 fixedly connected thereto. The nut lifter is fixed to the support plate 44 by bolts. The support column 32 is fixed to the support nut 311 by welding to increase the vertical stroke of the support nut 311. Other compositions and connection relationships are the same as those in the first, second, third, fourth, or fifth specific embodiments.

[0042] Among them, the nut lifter is an swl nut lifter.

[0043] Specific embodiment seven: CombineFigures 1 to 7 Referring to this embodiment, the drive system 2 of this embodiment includes a gear reduction motor 21, a steering gear 24, three linkage shafts 23 and six couplings 22. The worms in the two nut lifters on each support plate 44 are arranged coaxially. A steering gear 24 is provided between the two nut lifters. The two ends of the two worms are respectively connected to one end of the two linkage shafts 23 through two couplings 22. The other ends of the two linkage shafts 23 are respectively connected to the two output shafts of the steering gear 24 through two couplings 22. A gear reduction motor 21 is provided on the side of the steering gear 24. The input shaft of the steering gear 24 is connected to one end of another linkage shaft 23 through a coupling 22, and the other end of the linkage shaft 23 is connected to the rotating shaft of the gear reduction motor 21 through a coupling 22. With such an arrangement, the coupling 22 is used to connect the gear reduction motor 21, the linkage shaft 23 and the steering gear 24. The gear reduction motor 21 is fixed to the support plate 44 by bolts, and the steering gear 24 is fixed to the support plate 44 by bolts. The gear reduction motor 21 provides power for two sets of SWL screw jacks. The support columns 32 in the two sets of SWL screw jacks are fixed to the diagonal supports 34 by welding, which plays a role in limiting. The other components and connection relationships are the same as those in the first, second, third, fourth, fifth or sixth specific embodiments.

[0044] Among them, the steel structure welded heavy-duty assembly support platform further includes a master controller 1. The master controller 1 is respectively connected to the wheel reduction motor 21 through a plurality of wires, and is used to control the rotation speed of the wheel reduction motor 21, so as to indirectly control the vertical movement distance of the support nut 311 in the SWL screw jack.

[0045] Specific Embodiment Eight: Combining Figures 1 to 7 Referring to this embodiment, the steering gear 24 of this embodiment is a right-angle spiral bevel gear commutator. The right-angle spiral bevel gear commutator includes a gear box, an input shaft, a driving bevel gear, two output shafts and two driven bevel gears. The input shaft is rotatably installed on the rear side wall of the gear box. One end of the input shaft is located outside the gear box, and the other end of the input shaft is located inside the gear box. The end of the input shaft located inside the gear box is provided with a driving bevel gear, and the driving bevel gear meshes with the two driven bevel gears on both sides. The two driven bevel gears are respectively installed at one end of the two output shafts, and the other ends of the two output shafts are respectively rotatably installed on the left and right side walls of the gear box. With such an arrangement, the steering gear 24 is used to evenly distribute the power from the gear reduction motor 21 to the swl nut lifter. The other components and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth or seventh specific embodiments.

[0046] Working Principle

[0047] Combining Figures 1 to 7Describe the working principle of the heavy-duty assembly support platform for steel structure welding of the present utility model: According to the size of the steel box girder and the requirements for the welding position in this time, the operator controls the operation of the gear reducer 21 through the master controller 1, drives the SWL screw elevator to move up and down to the specified position. The steel box girder is hoisted onto this platform by the hoisting mechanism, and is directly contacted and borne through the top support cap 33. Then, it is locally adjusted according to the actual situation until all the top support caps 33 are in actual contact with the steel box girder. At this time, the hoisting mechanism can leave, and then the welding starts. After the welding work is completed, the hoisting mechanism hoists the finished steel box girder away, and the heavy-duty assembly support platform for steel structure welding finishes one support work. The operator then adjusts the platform according to the next requirements to carry out the next support work.

[0048] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present utility model.

Claims

1. A steel structure welding heavy assembly support platform, characterized by: It comprises a plurality of ground rail platforms (4), a plurality of drive systems (2) and a plurality of support systems (3). The plurality of ground rail platforms (4) are arranged side by side on a horizontal ground. Each ground rail platform (4) comprises a base (41), two guide rails (42), a plurality of sliders (43) and a plurality of support plates (44). The base (41) is arranged horizontally along the length direction of the supported steel box beam. Two guide rails (42) arranged side by side along the length direction of the base (41) are respectively arranged on both sides of the upper end of the base (41). The plurality of support plates (44) are sequentially arranged above the two guide rails (42) from front to back. The two sides of the bottom of each support plate (44) are respectively connected to the two guide rails (42) by sliding connection via a plurality of sliders (43). Each support plate (44) is connected to the two guide rails (42) by sliding connection via a plurality of sliders (43). 4) A support system (3) is respectively provided on the upper part, each support system (3) comprises a triangular support frame (35), two lifting mechanisms (31) and two support columns (32), the two lifting mechanisms (31) are symmetrically installed on the upper end of the support plate (44) with the center line of the support plate (44) as the center, the two support columns (32) are arranged above the two lifting mechanisms (31), the bottom end of each support column (32) is connected to the output end of the corresponding lifting mechanism (31), the two ends of the triangular support frame (35) are respectively connected to the top ends of the two support columns (32), and a driving system (2) is provided between the two lifting mechanisms (31), and the output ends of the driving system (2) are respectively connected to the input ends of the two lifting mechanisms (31).

2. A steel structure welding heavy-duty assembly support platform according to claim 1, characterized in that: The base (41) comprises two C-shaped steels (411), two rectangular steel beams (412), two seat plates (413), a plurality of cross beams (414) and a plurality of anchor connection plates (415). The two C-shaped steels (411) are arranged side by side in a horizontal direction. The two rectangular steel beams (412) are respectively installed in parallel at the top of the two C-shaped steels (411). The two seat plates (413) are respectively installed horizontally at the top of the two rectangular steel beams (412). A plurality of anchor connection plates (415) are respectively installed at the bottom of each C-shaped steel (411) in sequence from front to back along the length direction. The anchor connection plates (415) are connected to the horizontal ground through long screws. Cross beams (414) are evenly arranged in sequence from front to back along the length direction between the two C-shaped steels (411). The two ends of the cross beams (414) are respectively welded to the two C-shaped steels (411) and the inner side walls of the two rectangular steel beams (412).

3. A steel structure welding heavy-duty assembly support platform according to claim 2, characterized in that: Each ground rail platform (4) further comprises a plurality of locking bolts (45), a plurality of locking threaded holes are provided on the support plate (44), the locking threaded holes are vertically connected to the upper end surface of the seat plate (413), the plurality of locking bolts (45) are respectively screwedly installed in the plurality of locking threaded holes from the outside to the inside, and the distance between the lower end surface of the support plate (44) and the upper end surface of the seat plate (413) is less than the screw length of the locking bolt (45).

4. A steel structure welding heavy-duty assembly support platform according to claim 1 or 3, characterized in that: Each support system (3) further comprises an oblique support (34), wherein the oblique support (34) is an X-shaped structure, the oblique support (34) is vertically arranged between two support columns (32), and the two ends of the oblique support (34) are respectively connected to the outer side walls of the two support columns (32).

5. A steel structure welding heavy-duty assembly support platform according to claim 4, characterized in that: Each support system (3) also includes a top support cap (33) and a universal damping ball head (36); a horizontal mounting surface is processed at the top of the triangular support frame (35); the universal damping ball head (36) is mounted on the horizontal mounting surface of the triangular support frame (35); a ball head connecting threaded hole is processed at the center of the bottom end of the top support cap (33); and a screw at the top end of the universal damping ball head (36) is threadedly connected to the top support cap (33).

6. A steel structure welding heavy-duty assembly support platform according to claim 5, characterized in that: The lifting mechanism (31) is a nut lifter, which comprises a turbine housing, a worm housing, a turbine, a worm, a vertical screw (312), a connecting nut and a supporting nut (311). A coaxially arranged turbine is rotatably mounted inside the turbine housing. A nut mounting hole is provided at the center of the turbine end face. A connecting nut is rotatably mounted in the nut mounting hole. The connecting nut is spirally mounted on the vertical screw (312). A supporting nut (311) is spirally mounted on the upper part of the vertical screw (312). An end flange is provided at the lower end of the supporting nut (311). The supporting column (32) is a hollow tubular structure. The supporting column (32) is sleeved on the upper part of the corresponding vertical screw (312). The lower end of the supporting column (32) is connected to the end flange via a plurality of connecting screws. A transverse notch is provided on the side of the turbine housing. A worm housing is connected to the transverse notch. A coaxially arranged worm is rotatably mounted inside the worm housing. The worm is meshed with the turbine.

7. A steel structure welding heavy-duty assembly support platform according to claim 6, characterized in that: The driving system (2) comprises a gear reduction motor (21), a steering gear (24), three linkage shafts (23) and six couplings (22). The worms in the two nut elevators on each support plate (44) are coaxially arranged. A steering gear (24) is provided between the two nut elevators. The ends of the two worms are respectively connected to one end of the two linkage shafts (23) through two couplings (22). The other ends of the two linkage shafts (23) are respectively connected to two output shafts of the steering gear (24) through two couplings (22). A gear reduction motor (21) is provided on the side of the steering gear (24). The input shaft of the steering gear (24) is connected to one end of another linkage shaft (23) through the coupling (22). The other end of the linkage shaft (23) is connected to the rotating shaft of the gear reduction motor (21) through the coupling (22).

8. A steel structure welding heavy-duty assembly support platform according to claim 7, characterized in that: The steering gear (24) is a right-angle spiral bevel gear commutator, which comprises a gear box, an input shaft, a driving bevel gear, two output shafts and two driven bevel gears. The input shaft is rotatably mounted on the rear side wall of the gear box, one end of the input shaft is located outside the gear box, and the other end of the input shaft is located inside the gear box. The driving bevel gear is mounted on the end of the input shaft located inside the gear box, and the driving bevel gear is meshed with the two driven bevel gears on both sides. The two driven bevel gears are respectively mounted on one end of the two output shafts, and the other ends of the two output shafts are respectively rotatably mounted on the left and right side walls of the gear box.

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