Supporting jig frame for welding steel box girder

Abstract

The utility model discloses a supporting jig frame for welding a steel box girder and relates to the technical field of welding. The steel box girder jig frame solves the problems that an existing customized steel box girder jig frame is huge in cost, poor in adaptability and low in production efficiency. A horizontal connecting steel frame is arranged above the horizontal ground, a plurality of vertically-arranged bearing columns are evenly arranged below the horizontal connecting steel frame, the top ends of the bearing columns are connected with the lower end face of the horizontal connecting steel frame, the bottom ends of the bearing columns are arranged on the horizontal ground, and a plurality of vertically-arranged lifting mechanisms are evenly arranged above the horizontal connecting steel frame. The multiple lifting mechanisms are in one-to-one correspondence, a top supporting cap is arranged above each lifting mechanism, the extending ends of the lifting mechanisms are connected with the lower ends of the top supporting caps, and the input ends of the lifting mechanisms are connected with the output end of the driving system. The welding position adjusting device is used for rapidly adjusting the welding position of the steel box girder, effectively improves the production efficiency, and can be repeatedly used for steel box girders of different models.

Description

Technical Field

[0001] The utility model relates to the technical field of welding, in particular to a support jig for welding steel box girders. Background Art

[0002] During the construction of a bridge, a jig is required to provide overall effective support for the overall welding process of a steel box girder. Due to the design requirements of the bridge, the bottom of the steel box girder is generally arc-shaped, which requires that the jig be manufactured to meet this requirement and be able to effectively support the bottom of the steel box girder. Due to the size differences of different steel box girders, although it is feasible to customize a jig for each type of steel box girder, the cost of customizing the jig is huge and the production efficiency is greatly affected.

[0003] In summary, the existing customized steel box girder jigs have the problems of huge cost, poor adaptability, and low production efficiency. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problems of huge cost, poor adaptability, and low production efficiency existing in the existing customized steel box girder jigs. Furthermore, a support jig for welding steel box girders is provided.

[0005] The technical solution of the utility model is as follows:

[0006] A support jig for welding steel box girders includes a driving system 2 and a support system 3. The support system 3 includes a horizontal connecting steel frame 33, a plurality of load-bearing columns 34, a plurality of lifting mechanisms 31, and a plurality of top support caps 32. The horizontal connecting steel frame 33 is arranged above the horizontal ground. A plurality of vertically arranged load-bearing columns 34 are evenly provided below the horizontal connecting steel frame 33. The top ends of the load-bearing columns 34 are connected to the lower end surface of the horizontal connecting steel frame 33, and the bottom ends of the load-bearing columns 34 are placed on the horizontal ground. A plurality of vertically arranged lifting mechanisms 31 are evenly provided above the horizontal connecting steel frame 33. The plurality of lifting mechanisms 31 correspond one by one. A top support cap 32 is provided above each lifting mechanism 31. The extending end of the lifting mechanism 31 is connected to the lower end of the top support cap 32, and the input end of the lifting mechanism 31 is connected to the output end of the driving system 2.

[0007] Furthermore, the horizontal connecting steel frame 33 is an overall rectangular frame. The horizontal connecting steel frame 33 includes a plurality of transverse plate members and a plurality of longitudinal plate members. The plurality of transverse plate members are arranged side by side at equal intervals from front to back along the length direction of the steel box girder to be welded. A plurality of longitudinal plate members are arranged side by side at equal intervals from left to right between two adjacent transverse plate members along the width direction of the steel box girder to be welded. Both ends of each longitudinal plate member are perpendicularly connected to the corresponding transverse plate member.

[0008] Furthermore, the load-bearing column 34 includes a hollow column and a load-bearing bottom plate. The hollow column is vertically arranged at the intersection of the transverse plate member and the longitudinal plate member. The upper end of the hollow column is welded to the lower end face of the transverse plate member, and the lower end of the hollow column is welded to the upper end face of the load-bearing bottom plate. A plurality of uniformly arranged load-bearing bottom plate connection holes are machined on the load-bearing bottom plate, and the load-bearing bottom plate is connected to the horizontal ground through a plurality of connecting screws.

[0009] Furthermore, a lead screw installation through hole I is machined at the intersection of the transverse plate member and the longitudinal plate member, and the lead screw installation through hole I is coaxially arranged with the corresponding hollow column.

[0010] Furthermore, the lifting mechanism 31 is a lead screw lift, which includes a turbine housing, a worm housing, a turbine, a worm, a vertical lead screw 311, and an anti-rotation block. A coaxially arranged turbine is rotatably installed inside the turbine housing. A lead screw connection threaded hole is opened at the center of the end face of the turbine. The vertical lead screw 311 is helically installed in the lead screw connection threaded hole. Two coaxially arranged lead screw installation through holes II are respectively machined at the centers of the upper and lower ends of the turbine housing. The lower end of the vertical lead screw 311 sequentially passes through the lower lead screw installation through hole II and the lead screw installation through hole I and extends into the hollow column of the load-bearing column 34. A chute is opened on the inner wall of the hollow column along the vertical direction. An anti-rotation block is installed at the lower end of the vertical lead screw 311, and the anti-rotation block is slidably connected to the chute. The upper end of the vertical lead screw 311 passes through the upper lead screw installation through hole II and extends outside the turbine housing. A transverse notch is opened on the side of the turbine housing, and a worm housing is connected at the transverse notch. A coaxially arranged worm is rotatably installed inside the worm housing, and the worm meshes with the turbine.

[0011] Furthermore, a screw rod integrally formed with the body of the vertical lead screw 311 and coaxially arranged is provided at the upper end of the worm. The top support cap 32 is of a cylindrical structure. A threaded counterbore is machined at the center of the lower end face of the top support cap 32, and the top support cap 32 is threadedly connected to the screw rod at the upper end of the worm.

[0012] Furthermore, the plurality of lead screw lifts on the transverse plate member are arranged in pairs, and each pair of lead screw lifts shares a drive system 2. The two worms in each pair of lead screw lifts are coaxially arranged.

[0013] Further, the drive system 2 includes a gear speed reducer 21, a steering gear 24, a motor support table 25, three linkage shafts 23 and six couplings 22. A steering gear 24 is provided between each pair of screw jacks. The two output shafts of the steering gear 24 are respectively connected to one end of two linkage shafts 23 through two couplings 22. The other ends of the two linkage shafts 23 are respectively connected to two worms in each pair of screw jacks through two couplings 22. A gear speed reducer 21 is provided on the side of the steering gear 24. The gear speed reducer 21 is installed on the motor support table 25. The motor support table 25 is installed on the horizontal ground. The rotating shaft of the gear speed reducer 21 is connected to one end of a linkage shaft 23 through a coupling 22. The other end of this linkage shaft 23 is connected to an input shaft of the steering gear 24 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 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. 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. The other ends of the two output shafts are respectively rotatably installed on the left and right side walls of the gear box.

[0015] Further, it further includes a protective shell 4. The overall shape of the protective shell 4 is a T-shaped shell. The protective shell 4 covers the drive system 2. The protective shell 4 is fixed on the horizontal connecting steel frame 33 and the motor support table 25.

[0016] The utility model has the following effects compared with the prior art:

[0017] 1. The support jig for steel box girder welding of the utility model can be arbitrarily adjusted to the required height by the up and down movement of the screw jacks, and thus can be adapted to different models of steel box girders. It has strong versatility and flexibility, is easy to operate, can be reused, does not waste materials, effectively improves the welding efficiency, reduces the production cost, and greatly improves the versatility and flexibility.

[0018] 2. In the support jig for steel box girder welding of the utility model, the screw jacks on the transverse plate are arranged in pairs. Each pair of screw jacks shares a drive system. The gear speed reducer drives the vertical screws in the corresponding screw jacks to move up and down simultaneously through the steering gear and the linkage shaft. Using one drive system to drive the vertical screws in two screw jacks to move up and down simultaneously can effectively reduce the manufacturing cost of the equipment and save energy.

[0019] 3. The support jig for welding steel box girders of the present utility model can quickly adjust the welding position and can be reused for different models of steel box girders. According to the size of the steel box girder and the requirements for the welding position, the gear reducer is controlled by the main controller to work, driving the screw jack to move up and down to the specified position. The steel box girder is hoisted onto this jig by the hoisting mechanism, and is directly supported by contacting the top support cap. Then, local adjustment is made according to the actual situation until all the top support caps are in actual contact with the steel box girder, which has good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the support jig for welding steel box girders of the present utility model;

[0021] Figure 2 is a schematic structural diagram of the drive system in the support jig for welding steel box girders of the present utility model;

[0022] Figure 3 is an exploded view of the support system in the support jig for welding steel box girders of the present utility model;

[0023] Figure 4 is a schematic installation diagram of the protective shell in the support jig for welding steel box girders of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] DETAILED DESCRIPTION OF THE EMBODIMENT 1: In combination with Figures 1 to 4 this embodiment is described. A support jig for welding steel box girders in this embodiment includes a drive system 2 and a support system 3. The support system 3 includes a horizontal connecting steel frame 33, a plurality of load-bearing columns 34, a plurality of lifting mechanisms 31, and a plurality of top support caps 32. The horizontal connecting steel frame 33 is arranged above the horizontal ground. A plurality of vertically arranged load-bearing columns 34 are evenly provided below the horizontal connecting steel frame 33. The top ends of the load-bearing columns 34 are connected to the lower end surface of the horizontal connecting steel frame 33, and the bottom ends of the load-bearing columns 34 are placed on the horizontal ground. A plurality of vertically arranged lifting mechanisms 31 are evenly provided above the horizontal connecting steel frame 33. The plurality of lifting mechanisms 31 correspond one by one. A top support cap 32 is provided above each lifting mechanism 31. The extending end of the lifting mechanism 31 is connected to the lower end of the top support cap 32. The input end of the lifting mechanism 31 is connected to the output end of the drive system 2.

[0025] DETAILED DESCRIPTION OF THE EMBODIMENT 2: In combination with Figures 1 to 4Describing this embodiment, the horizontal connecting steel frame 33 of this embodiment is a rectangular frame as a whole. The horizontal connecting steel frame 33 includes a plurality of transverse plate members and a plurality of longitudinal plate members. The plurality of transverse plate members are arranged side by side at equal intervals from front to back along the length direction of the steel box girder to be welded. A plurality of longitudinal plate members are arranged side by side at equal intervals from left to right between two adjacent transverse plate members along the width direction of the steel box girder to be welded. Both ends of each longitudinal plate member are perpendicularly connected to the corresponding transverse plate member. With such an arrangement, the horizontal connecting steel frame 33 is welded by several transverse and vertical channel steels, which is used to carry the screw jack and enhance the overall stability. Other compositions and connection relationships are the same as those in the first specific embodiment.

[0026] Among them, both the transverse plate members and the longitudinal plate members are made of channel steels.

[0027] Specific embodiment three: Combining Figures 1 to 4 Describing this embodiment, the load-bearing column 34 of this embodiment includes a hollow column and a load-bearing bottom plate. The hollow column is vertically arranged at the intersection of the transverse plate member and the longitudinal plate member. The upper end of the hollow column is welded to the lower end surface of the transverse plate member, and the lower end of the hollow column is welded to the upper end surface of the load-bearing bottom plate. A plurality of uniformly arranged load-bearing bottom plate connection holes are processed on the load-bearing bottom plate, and the load-bearing bottom plate is connected to the horizontal ground through a plurality of connecting screws. With such an arrangement, among them, there are 24 groups of load-bearing columns 34, which are fixed to the bottom of the horizontal connecting steel frame 33 by welding, and have the following functions: on the one hand, it is used to support the overall horizontal connecting steel frame 33, and on the other hand, the load-bearing column 34 is a hollow steel pipe, which is used to protect the thread on the vertical screw rod 311 and prevent it from being knocked. Other compositions and connection relationships are the same as those in the first or second specific embodiment.

[0028] Specific embodiment four: Combining Figures 1 to 4 Describing this embodiment, a screw rod installation through hole one is processed at the intersection of the transverse plate member and the longitudinal plate member of this embodiment. The screw rod installation through hole one is coaxially arranged with the corresponding hollow column. With such an arrangement, the screw rod installation through hole one is used for the vertical screw rod 311 of the screw jack to pass through and move up and down. Other compositions and connection relationships are the same as those in the first, second or third specific embodiment.

[0029] Specific embodiment five: Combining Figures 1 to 4To describe this embodiment, the lifting mechanism 31 in this embodiment is a screw jack. The screw jack includes a worm wheel housing, a worm housing, a worm wheel, a worm, a vertical screw rod 311, and an anti-rotation block. A worm wheel is rotatably installed inside the worm wheel housing coaxially. A screw connection threaded hole is provided at the center of the end face of the worm wheel. The vertical screw rod 311 is helically installed in the screw connection threaded hole. Two coaxially arranged screw rod installation through holes II are respectively machined at the centers of the upper and lower ends of the worm wheel housing. The lower end of the vertical screw rod 311 sequentially passes through the lower screw rod installation through hole II and the screw rod installation through hole I and extends into the hollow column of the load-bearing column 34. A chute is provided on the inner wall of the hollow column along the vertical direction. An anti-rotation block is installed at the lower end of the vertical screw rod 311. The anti-rotation block is slidably connected to the chute. The upper end of the vertical screw rod 311 passes through the upper screw rod installation through hole II and extends outside the worm wheel housing. A horizontal notch is provided on the side of the worm wheel housing. A worm housing is connected at the horizontal notch. A worm is rotatably installed inside the worm housing coaxially. The worm meshes with the worm wheel. With such a setting, the gear reducer 21 drives the worm wheel in the screw jack to rotate, and then drives the vertical screw rod 311 threadedly connected to the worm wheel to perform a lifting action. Other components and connection relationships are the same as those in the first, second, third, or fourth specific embodiments.

[0030] Among them, SWL screw jacks are used for the screw jacks. There are 16 groups of SWL screw jacks, which are fixed to the horizontal connection steel frame 33 by bolts.

[0031] Specific embodiment six: In combination with Figures 1 to 4 To describe this embodiment, a screw rod integrally formed with the body of the vertical screw rod 311 and coaxially arranged is provided at the upper end of the worm in this embodiment. The top support cap 32 is of a cylindrical structure. A threaded counterbore is machined at the center of the lower end face of the top support cap 32. The top support cap 32 is threadedly connected to the screw rod at the upper end of the worm. With such a setting, the top support cap 32 is threadedly connected to the vertical screw rod 311, which is convenient for the quick disassembly, assembly, and replacement of the top support cap 32. Other components and connection relationships are the same as those in the first, second, third, fourth, or fifth specific embodiments.

[0032] Among them, the connection method between the top support cap 32 and the vertical screw rod 311 can also adopt a welding method. The top support cap 32 is fixed to the top of the vertical screw rod 311 by welding for direct contact and bearing with the steel box girder.

[0033] Specific embodiment seven: In combination with Figures 1 to 4Describing this embodiment, multiple screw jacks on the horizontal plate member of this embodiment are arranged in pairs, and each pair of screw jacks shares a driving system 2, and the two worms in each pair of screw jacks are coaxially arranged. With such a setting, using one driving system 2 to simultaneously drive the vertical screws 311 in two screw jacks to move up and down can effectively reduce the manufacturing cost of the equipment and save energy. The other components and connection relationships are the same as those in the first, second, third, fourth, fifth, or sixth specific embodiments.

[0034] Specific embodiment eight: Combining Figures 1 to 4 Describing this embodiment, the driving system 2 of this embodiment includes a gear reducer 21, a steering gear 24, a motor support table 25, three linkage shafts 23, and six couplings 22. A steering gear 24 is provided between each pair of screw jacks. The two output shafts of the steering gear 24 are respectively connected to one end of the two linkage shafts 23 through two couplings 22, and the other ends of the two linkage shafts 23 are respectively connected to the two worms in each pair of screw jacks through two couplings 22. A gear reducer 21 is provided on the side of the steering gear 24, the gear reducer 21 is installed on the motor support table 25, the motor support table 25 is installed on the horizontal ground, and the rotating shaft of the gear reducer 21 is connected to one end of a linkage shaft 23 through a coupling 22, and the other end of this linkage shaft 23 is connected to an input shaft of the steering gear 24 through a coupling 22. With such a setting, the gear reducer 21 drives the vertical screw 311 in the corresponding screw jack 31 to move up and down through the steering gear 24 and the linkage shaft 23. The other components and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth, or seventh specific embodiments.

[0035] Among them, the gear reducer 21 is fixed to the motor support table 25 by bolts. The steering gear 24 is fixed to the horizontal connection steel frame 33 by bolts. The coupling 23 is used to connect the gear reducer 21, the linkage shaft 23, and the steering gear 24.

[0036] Among them, the steel box girder welding support jig further includes a total controller 1. The total controller 1 is respectively connected to all the gear reducers 21 through a plurality of wires. The total controller 1 is used to control the rotation speed of the gear reducer 21, so as to indirectly control the vertical movement distance of the vertical screw 311 in the screw jack.

[0037] Specific embodiment nine: Combining Figures 1 to 4Description of this embodiment: The steering gear 24 in this embodiment is a right-angle spiral bevel gear commutator. The right-angle spiral bevel gear commutator includes a gearbox, 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 gearbox. One end of the input shaft is located outside the gearbox, and the other end is located inside the gearbox. The driving bevel gear is installed at the end of the input shaft located inside the gearbox. 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. The other ends of the two output shafts are respectively rotatably installed on the left and right side walls of the gearbox. With such a setting, the gear reducer 21 drives the input shaft in the right-angle spiral bevel gear commutator to rotate. The driving bevel gear on the input shaft drives the two driven bevel gears to rotate simultaneously. The two output shafts in the right-angle spiral bevel gear commutator drive the two worms in a corresponding pair of screw jacks to rotate, thereby driving the screw jacks to move up and down. The other components and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth, seventh, or eighth specific embodiments.

[0038] Specific Embodiment Ten: In combination with Figures 1 to 4 Description of this embodiment: This embodiment further includes a protective housing 4. The overall shape of the protective housing 4 is a T-shaped housing. The protective housing 4 covers the drive system 2 and is fixed on the horizontal connecting steel frame 33 and the motor receiving platform 25. With such a setting, the protective housing 4 plays a role in dust prevention. The other components and connection relationships are the same as those in the first, second, third, fourth, fifth, sixth, seventh, eighth, or ninth specific embodiments.

[0039] Working Principle

[0040] In combination with Figures 1 to 4 Description of the working principle of the support jig for steel box girder welding of the present utility model: The operator controls the gear reducer 21 to work according to the size of the steel box girder and the requirements for the welding position in this time, drives the screw jacks to move up and down to the specified position. The steel box girder is hoisted onto this jig by the hoisting mechanism and is directly supported by contacting the top support caps 32. Then, it is adjusted locally according to the actual situation until all the top support caps 32 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 one support work of the support jig for steel box girder welding is completed. The operator then adjusts the jig according to the next requirements for the next support work.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention 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 on 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 invention.

Claims

1. A support frame for welding a steel box beam, characterized in that: It comprises a driving system (2) and a supporting system (3). The supporting system (3) comprises a horizontal connecting steel frame (33), a plurality of load-bearing columns (34), a plurality of lifting mechanisms (31) and a plurality of top supporting caps (32). The horizontal connecting steel frame (33) is arranged above the horizontal ground. A plurality of vertically arranged load-bearing columns (34) are evenly arranged below the horizontal connecting steel frame (33). The top ends of the load-bearing columns (34) are connected to the lower end surfaces of the horizontal connecting steel frame (33). The bottom ends of the load-bearing columns (34) are placed on the horizontal ground. A plurality of vertically arranged lifting mechanisms (31) are evenly arranged above the horizontal connecting steel frame (33). The plurality of lifting mechanisms (31) correspond to each other one by one. A top supporting cap (32) is arranged above each lifting mechanism (31). The protruding end of the lifting mechanism (31) is connected to the lower end of the top supporting cap (32). The input end of the lifting mechanism (31) is connected to the output end of the driving system (2).

2. The support frame for welding a steel box beam according to claim 1, characterized in that: The horizontal connecting steel frame (33) is a rectangular frame as a whole. The horizontal connecting steel frame (33) includes a plurality of transverse plates and a plurality of longitudinal plates. The plurality of transverse plates are arranged side by side at equal intervals from front to back along the length direction of the steel box girder to be welded. A plurality of longitudinal plates are arranged side by side at equal intervals from left to right along the width direction of the steel box girder to be welded between two adjacent transverse plates. Both ends of each longitudinal plate are respectively vertically connected to the corresponding transverse plate.

3. The support frame for welding a steel box beam according to claim 2, characterized in that: The load-bearing column (34) comprises a hollow column and a load-bearing base plate. The hollow column is vertically arranged at the junction of the transverse plate and the longitudinal plate. The upper end of the hollow column is welded to the lower end surface of the transverse plate. The lower end of the hollow column is welded to the upper end surface of the load-bearing base plate. The load-bearing base plate is processed with a plurality of evenly arranged load-bearing base plate connection holes. The load-bearing base plate is connected to the horizontal ground through a plurality of connection screws.

4. The support frame for welding a steel box beam according to claim 3, characterized in that: A screw rod installation through hole is processed at the intersection of the horizontal plate and the longitudinal plate, and the screw rod installation through hole is coaxially arranged with the corresponding hollow column.

5. The support frame for welding a steel box beam according to claim 4, characterized in that: The lifting mechanism (31) is a screw lift, which includes a turbine housing, a worm housing, a turbine, a worm, a vertical screw (311) and an anti-rotation block. A coaxially arranged turbine is rotatably installed inside the turbine housing. A screw connection threaded hole is provided at the center of the turbine end face. The vertical screw (311) is spirally installed in the screw connection threaded hole. Two coaxially arranged screw installation through holes are respectively processed at the centers of the upper and lower ends of the turbine housing. The lower ends of the vertical screws (311) pass through the lower screw installation through holes in sequence. The second and the screw rod installation through hole extend to the inside of the hollow column of the load-bearing column (34); a slide groove is provided on the inner wall of the hollow column in the vertical direction; an anti-rotation block is installed at the lower end of the vertical screw rod (311); the anti-rotation block is slidably connected to the slide groove; the upper end of the vertical screw rod (311) passes through the upper screw rod installation through hole two and extends to the outside of the turbine housing; 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 installed inside the worm housing; the worm is meshed with the turbine.

6. The support frame for welding a steel box beam according to claim 5, characterized in that: The upper end of the worm is provided with a screw which is integrally formed with the vertical screw (311) body and arranged coaxially. The top support cap (32) is a cylindrical structure. A threaded countersunk hole is processed at the center of the lower end surface of the top support cap (32). The screw at the upper end of the top support cap (32) worm is threadedly connected.

7. The support frame for welding a steel box beam according to claim 6, characterized in that: The plurality of screw lifts on the transverse plate are arranged in pairs, each pair of screw lifts shares a driving system (2), and the two worms in each pair of screw lifts are coaxially arranged.

8. The support frame for welding a steel box beam according to claim 7, characterized in that: The driving system (2) comprises a gear reducer (21), a steering gear (24), a motor receiving platform (25), three linkage shafts (23) and six couplings (22). A steering gear (24) is provided between each pair of screw lifts. Two output shafts of the steering gear (24) are respectively connected to one end of two linkage shafts (23) through two couplings (22). The other ends of the two linkage shafts (23) are respectively connected to two worms in each pair of screw lifts through two couplings (22). A gear reducer (21) is provided on the side of the steering gear (24). The gear reducer (21) is mounted on the motor receiving platform (25). The motor receiving platform (25) is mounted on a horizontal ground. The rotating shaft of the gear reducer (21) is connected to one end of a linkage shaft (23) through a coupling (22). The other end of the linkage shaft (23) is connected to an input shaft of the steering gear (24) through the coupling (22).

9. The support frame for welding a steel box beam according to claim 8, 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.

10. A support frame for welding a steel box beam according to claim 9, characterized in that: It also includes a protective shell (4), which is a T-shaped shell as a whole. The protective shell (4) is covered on the drive system (2), and the protective shell (4) is fixed on a horizontal connecting steel frame (33) and a motor receiving platform (25).

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