Welding device for bridge steel truss girder steel

Abstract

The invention discloses a welding device for bridge steel truss girder steel, and relates to the technical field of steel welding. The welding mechanism comprises a moving plate, a moving assembly, a welding trolley, a lifting base, a welding base, a welding structure, an auxiliary assembly, a first rotating motor, a reinforcing piece and a sliding ring. A second lifting motor, a third lead screw transmission device and an auxiliary base limit steel truss girder steel, a first rotating motor, a lifting base and a welding base are matched to adjust the orientation of a welding structure, the welding structure can weld the steel truss girder steel from the upper side and the lower side, the steel truss girder steel does not need to be turned over for welding, the labor intensity of workers is relieved, and the welding efficiency is improved. The connecting stability between the welding base and the lifting base is improved through a reinforcing piece and a sliding ring, the position of the moving plate is adjusted through a first driving motor, a gear and a rack, and the position of bridge steel truss girder steel is controlled and adjusted through a hydraulic cylinder, an auxiliary base, a first limiting block and a second limiting block.

Description

Technical Field

[0001] The invention belongs to the technical field of steel welding, in particular to a welding device for bridge steel truss steel. Background Art

[0002] A bridge generally refers to a structure erected on rivers, lakes, and the sea to enable vehicles and pedestrians to pass smoothly. Modern bridges are also extended to buildings that are erected to cross poor geology or meet other traffic needs to make passage more convenient. Bridges are generally composed of superstructures, substructures, supports, and auxiliary structures. Steel trusses are an important form of bridge structure, mainly composed of steel. Steel truss steel is usually composed of I-beams, H-beams, channel steels, or angle steels. During the construction of steel trusses, the steel structures need to be welded. Therefore, a welding device for bridge steel truss steel is needed.

[0003] The existing welding devices for bridge steel truss girder materials have certain disadvantages when in use. When in use, the existing welding devices for bridge steel truss girder materials usually transport the bridge steel truss girder materials to a factory building in a construction site for welding. During welding, the bridge steel truss girder materials are usually welded by workers or by using a driving device to control the welding structure. However, when welding I-beams, channel steels or angle steels, the entire steel truss girder material needs to be turned over and then the bottom surface of the steel truss girder material is welded, which increases the labor intensity of the workers and reduces the welding efficiency of the welding device, and cannot meet people's needs. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art; to this end, the present invention proposes a welding device for bridge steel truss steel.

[0005] A welding device for bridge steel truss steel, comprising a support frame and a welding mechanism arranged on the support frame; wherein the welding mechanism comprises a plurality of groups of movable plates movably arranged on the support frame and in contact with the lower end of the bridge steel truss steel and a movable assembly for controlling the movable plates to move horizontally, the support frame supports the bridge steel truss steel, and the movable assembly controls the movable plates to move, thereby adjusting the position between the movable plates and the bridge steel truss steel, so as to facilitate all-round welding of the bridge steel truss steel; the welding mechanism also comprises a welding vehicle movably arranged on one side of the support frame, a lifting seat movably arranged on the inner side of the welding vehicle, and a lifting seat movably arranged on the lifting seat. The lowering seat comprises a welding seat movably connected to the lowering seat, a welding structure movably installed on the welding seat, and auxiliary components symmetrically arranged on both sides of the welding seat for auxiliary welding. The welding vehicle can move forward, backward, left and right, and the welding structure can weld bridge steel trusses. The welding mechanism also includes a first rotating motor arranged inside the lifting seat and controlling the rotation of the welding seat, a reinforcement piece detachably arranged at one end of the welding seat, and a sliding ring that slidably connects the reinforcement piece to the lifting seat. The lifting seat is provided with a sliding groove slidably connected to the sliding ring. The reinforcement piece and the sliding ring are used together to improve the stability of the connection between the welding seat and the lifting seat.

[0006] As a further solution of the present invention: a reinforcement plate that is in contact with the lifting seat is provided at one end of the welding seat, the output shaft of the first rotating motor passes through the lifting seat and is connected to a side surface of the reinforcement plate, the vertical cross-section of the welding seat is a square structure, the lifting seat is a cylindrical structure, the reinforcement is a circular cover structure, the welding seat is fixedly connected to the reinforcement, the reinforcement rotates around the lifting seat, and the first rotating motor controls the welding seat to rotate through the reinforcement plate, so that welding can be performed under the steel truss of the bridge.

[0007] As a further solution of the present invention: a first lifting motor and a first screw transmission device connected to the output shaft of the first lifting motor are arranged inside the welding vehicle, a first reinforcement strip connected to the lifting seat is vertically arranged on the first screw transmission device, and the first lifting motor and the first screw transmission device cooperate to control the lifting seat to move up and down.

[0008] As a further solution of the present invention: the support frame includes a bottom plate, several groups of side plate beams vertically arranged on the bottom plate and two groups of top plates symmetrically arranged on the side plate beams, the upper ends of the side plate beams are provided with reinforcing beams connected to the top plates, and several groups of the movable plates are slidably arranged on the upper ends of the side plate beams, and the reinforcing beams can improve the firmness of the connection between the two groups of top plates and the side plate beams.

[0009] As a further solution of the present invention: the moving assembly includes several groups of first drive motors vertically arranged on the lower end surface of the moving plate and attached to the reinforcing beam, gears detachably mounted on the output shaft of the first drive motor, and racks mounted on the outer surface of the side plate beam and meshing with the gears. The first drive motor controls the horizontal movement of the moving plate through the gears and the racks.

[0010] As a further solution of the present invention: the auxiliary component includes an auxiliary seat symmetrically and movably arranged on the welding vehicle, a first limit block vertically fixed at the lower end of the auxiliary seat and a second limit block movably arranged on one side of the first limit block; the hydraulic cylinder, the first limit block and the second limit block cooperate to control the horizontal movement of the bridge steel truss on the support frame, thereby adjusting the position of the bridge steel truss; the auxiliary seat can fix and limit the bridge steel truss; the auxiliary seat is provided with a hydraulic cylinder for controlling the horizontal movement of the second limit block; a slider connected to the second limit block is provided inside the auxiliary seat; and a slide groove slidably connected to the slider is provided on the auxiliary seat.

[0011] As a further solution of the present invention: two sets of second lifting motors and a third screw transmission device connected to the second lifting motors are symmetrically arranged inside the welding vehicle, and a third reinforcement bar connected to the auxiliary seat is vertically arranged on the third screw transmission device. The second lifting motor and the third screw transmission device cooperate to adjust the height of the auxiliary seat, thereby fixing and limiting the steel truss of the bridge.

[0012] As a further solution of the present invention: a second screw transmission device connected to the welding structure is arranged inside the welding seat, and a second drive motor connected to the second screw transmission device is arranged at one end of the welding seat away from the lifting seat. The second drive motor and the second screw transmission device can control the horizontal movement of the welding structure, thereby performing multi-directional welding of the bridge steel truss steel.

[0013] As a further solution of the present invention: the lower end face of the welding seat is provided with a rotating seat for controlling the rotation of the welding structure, the second screw transmission device is vertically provided with a second reinforcement strip connected to the rotating seat, and a rotating motor for controlling the horizontal rotation of the welding structure is installed inside the rotating seat. The rotating motor can control the horizontal rotation of the welding structure and can perform multi-angle welding on bridge steel trusses.

[0014] As a further solution of the present invention: a rotating seat connected to the output shaft of the rotating motor is arranged under the rotating seat, a rotating part detachably connected to the welding structure is arranged inside the rotating seat, a second rotating motor for controlling the rotation of the rotating part is arranged outside the rotating seat, and the second rotating motor controls the rotation of the welding structure through the rotating part, thereby performing multi-angle welding of bridge steel trusses.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] (1) The present invention sets a support frame and a welding mechanism, a second lifting motor, a third screw transmission device and an auxiliary seat to limit the position of the bridge steel truss steel. The first rotating motor, the lifting seat and the welding seat cooperate to adjust the direction of the welding structure, so that the welding structure can weld the steel truss steel from the upper and lower sides, and there is no need to turn the steel truss steel over for welding, which reduces the labor intensity of the staff. The reinforcement and the sliding ring improve the connection stability between the welding seat and the lifting seat. The first driving motor, the gear and the rack adjust the position of the movable plate. The hydraulic cylinder, the auxiliary seat, the first limit block and the second limit block control and adjust the position of the bridge steel truss steel, thereby avoiding welding dead angles when the welding structure is welded at the bottom, and improving the welding efficiency of the welding device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a partial structural diagram of the support frame and welding mechanism in the present invention.

[0019] Figure 3 It is a partial structural diagram of the welding vehicle and the welding seat in the present invention.

[0020] Figure 4 It is a partial structural diagram of the reinforcement member and the sliding ring in the present invention.

[0021] Figure 5 It is a partial structural diagram of the first lifting motor and the welding seat in the present invention.

[0022] Figure 6 It is a partial structural diagram of the moving plate and the moving component in the present invention.

[0023] Figure 7 It is a partial structural diagram of the auxiliary components in the present invention.

[0024] Figure 8 It is a partial structural diagram of the second drive motor and the rotating motor in the present invention.

[0025] In the figure: 1. support frame; 2. moving plate; 3. welding vehicle; 4. lifting seat; 5. welding seat; 6. welding structure; 7. first rotating motor; 8. reinforcement member; 9. sliding ring; 10. first lifting motor; 11. first screw transmission device; 12. bottom plate; 13. side plate beam; 14. top plate; 15. reinforcement beam; 16. first drive motor; 17. gear; 18. rack; 19. second screw transmission device; 20. second drive motor; 21. rotating seat; 22. auxiliary seat; 23. first limit block; 24. second limit block; 25. hydraulic cylinder; 26. second lifting motor; 27. third screw transmission device; 28. rotating motor; 29. ​​rotating seat; 30. rotating member; 31. second rotating motor. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Embodiment 1

[0028] See also Figure 1 - Figure 6 The present application provides a welding device for bridge steel truss steel, comprising a support frame 1 and a welding mechanism arranged on the support frame 1; wherein the welding mechanism comprises a plurality of groups of movable plates 2 movably arranged on the support frame 1 and in contact with the lower end of the bridge steel truss steel and a movable assembly for controlling the movable plates 2 to move horizontally, the support frame 1 supports the bridge steel truss steel, and the movable assembly controls the movable plates 2 to move, thereby adjusting the position between the movable plates 2 and the bridge steel truss steel, so as to facilitate all-round welding of the bridge steel truss steel; the welding mechanism also comprises a welding vehicle 3 movably arranged on one side of the support frame 1, a lifting seat 4 movably arranged on the inner side of the welding vehicle 3, and a lifting seat 5 movable on the lifting seat 5. The lowering seat 4 includes a welding seat 5 movably connected to the welding seat 5, a welding structure 6 movably installed on the welding seat 5, and auxiliary components symmetrically arranged on both sides of the welding seat 5 for auxiliary welding. The welding vehicle 3 can move forward, backward, left and right, and the welding structure 6 can weld the steel truss of the bridge; the welding mechanism also includes a first rotating motor 7 arranged inside the lifting seat 4 and controlling the rotation of the welding seat 5, a reinforcement 8 detachably arranged at one end of the welding seat 5, and a sliding ring 9 that slidably connects the reinforcement 8 to the lifting seat 4. The lifting seat 4 is provided with a sliding groove slidably connected to the sliding ring 9. The reinforcement 8 and the sliding ring 9 are used together to improve the stability of the connection between the welding seat 5 and the lifting seat 4.

[0029] In the present invention, a reinforcement plate that fits the lifting seat 4 is provided at one end of the welding seat 5, the output shaft of the first rotating motor 7 passes through the lifting seat 4 and is connected to one side of the reinforcement plate, the vertical section of the welding seat 5 is a square structure, the lifting seat 4 is a cylindrical structure, the reinforcement member 8 is a circular ring cover structure, the welding seat 5 is fixedly connected to the reinforcement member 8, and the reinforcement member 8 rotates around the lifting seat 4. The first rotating motor 7 controls the rotation of the welding seat 5 through the reinforcement plate, so that welding can be performed under the steel truss of the bridge.

[0030] In the present invention, the interior of the welding vehicle 3 is provided with a first lifting motor 10 and a first screw transmission device 11 connected to the output shaft of the first lifting motor 10, and a first reinforcement strip connected to the lifting seat 4 is vertically arranged on the first screw transmission device 11. The first lifting motor 10 and the first screw transmission device 11 cooperate to control the lifting seat 4 to lift.

[0031] The support frame 1 in the present invention includes a bottom plate 12, several groups of side plate beams 13 vertically arranged on the bottom plate 12 and two groups of top plates 14 symmetrically arranged on the side plate beams 13. The upper ends of the side plate beams 13 are provided with reinforcing beams 15 connected to the top plates 14. Several groups of movable plates 2 are all slidably arranged on the upper ends of the side plate beams 13. The reinforcing beams 15 can improve the firmness of the connection between the two groups of top plates 14 and the side plate beams 13.

[0032] The moving assembly in the present invention includes several groups of first drive motors 16 vertically arranged on the lower end surface of the moving plate 2 and attached to the reinforcement beam 15, a gear 17 detachably mounted on the output shaft of the first drive motor 16, and a rack 18 mounted on the outer surface of the side plate beam 13 and meshing with the gear 17. The first drive motor 16 and the first drive motor 16 are used in combination to limit the moving plate 2 to prevent the moving plate 2 from lateral displacement. The first drive motor 16 controls the moving plate 2 to move horizontally through the gear 17 and the rack 18.

[0033] In summary, the bridge steel truss steel is placed on the support frame 1, the welding vehicle 3 is moved to one side of the support frame 1, the first lifting motor 10 is started, and the first screw transmission device 11 is driven to work. The first screw transmission device 11 drives the lifting seat 4 to lift through the first reinforcement bar, and the lifting seat 4 drives the welding seat 5 to move downward, and the welding structure 6 is started to weld the bridge steel truss steel. When welding is performed on the bottom of the bridge steel truss steel, the welding vehicle 3 is moved away, the first lifting motor 10 is started to control the welding seat 5 to move downward through the first screw transmission device 11, and the first rotating motor 7 is started to drive the welding seat 5 to rotate, and the welding seat 5 drives the reinforcement 8 to rotate, and the reinforcement 8 drives the sliding ring 9 to rotate in the sliding groove, and the welding structure 6 is moved to the bottom of the bridge steel truss steel and welded. When the movable plate 2 needs to be removed, the first drive motor 16 is started, and the gear 17 is engaged with the rack 18, so that the movable plate 2 moves horizontally on the reinforcement beam 15, so that the welding structure 6 can perform all-round welding on the bridge steel truss steel.

[0034] Embodiment 2

[0035] Reference Figure 2 , Figure 7 and Figure 8 , which is the second embodiment of the present invention, wherein the auxiliary component in the present invention includes an auxiliary seat 22 symmetrically and movably arranged on the welding vehicle 3, a first limit block 23 vertically fixedly arranged at the lower end of the auxiliary seat 22, and a second limit block 24 movably arranged on one side of the first limit block 23. The hydraulic cylinder 25, the first limit block 23 and the second limit block 24 cooperate to control the bridge steel truss steel to move horizontally on the support frame 1, thereby adjusting the position of the bridge steel truss steel. The auxiliary seat 22 can fix and limit the bridge steel truss steel. The auxiliary seat 22 is provided with a hydraulic cylinder 25 for controlling the horizontal movement of the second limit block 24. A reinforcement rod detachably connected to the output shaft of the hydraulic cylinder 25 is vertically arranged on one side of the second limit block 24. A slider connected to the second limit block 24 is arranged inside the auxiliary seat 22, and a slide groove slidably connected to the slider is arranged on the auxiliary seat 22.

[0036] In the present invention, two sets of second lifting motors 26 and a third screw transmission device 27 connected to the second lifting motor 26 are symmetrically arranged inside the welding vehicle 3. A third reinforcement bar connected to the auxiliary seat 22 is vertically arranged on the third screw transmission device 27. The second lifting motor 26 and the third screw transmission device 27 cooperate to adjust the height of the auxiliary seat 22, thereby fixing and limiting the steel of the bridge steel truss.

[0037] In the present invention, a second screw transmission device 19 connected to the welding structure 6 is arranged inside the welding seat 5, and a second drive motor 20 connected to the second screw transmission device 19 is arranged at one end of the welding seat 5 away from the lifting seat 4. The second drive motor 20 and the second screw transmission device 19 can control the welding structure 6 to move horizontally, thereby performing multi-directional welding of the bridge steel truss steel.

[0038] In the present invention, the lower end face of the welding seat 5 is provided with a rotating seat 21 for controlling the rotation of the welding structure 6, and a second reinforcement bar connected to the rotating seat 21 is vertically arranged on the second screw transmission device 19. A rotating motor 28 for controlling the horizontal rotation of the welding structure 6 is installed inside the rotating seat 21. The rotating motor 28 can control the horizontal rotation of the welding structure 6 and can perform multi-angle welding on the bridge steel truss steel.

[0039] In the present invention, a rotating seat 29 connected to the output shaft of the rotating motor 28 is arranged below the rotating seat 21, and a rotating part 30 detachably connected to the welding structure 6 is arranged inside the rotating seat 29. A second rotating motor 31 for controlling the rotation of the rotating part 30 is arranged on the outer side of the rotating seat 29. The second rotating motor 31 controls the rotation of the welding structure 6 through the rotating part 30, thereby performing multi-angle welding on the bridge steel truss steel.

[0040] In summary, the second lifting motor 26 is started to drive the third screw transmission device 27 to work, and the third screw transmission device 27 drives the auxiliary seat 22 to move downward through the third reinforcement bar, so that the auxiliary seat 22 fixes and limits the bridge steel truss steel, and the welding car 3 is moved to connect the first limit block 23 with the bridge steel truss steel. The hydraulic cylinder 25 is started to drive the reinforcement rod to move, and the reinforcement rod drives the second limit block 24 to move horizontally. The second limit block 24 slides in the slide groove through the slider, so that the first limit block 23 and the second limit block 24 cooperate to clamp and limit the bridge steel truss steel. The welding car 3 is moved to drive the bridge steel truss steel to move on the support frame 1, thereby adjusting the position of the bridge steel truss steel, so that the welding structure 6 performs multi-directional welding on the bridge steel truss steel.

[0041] Start the second drive motor 20 to drive the second screw transmission device 19 to work, the second screw transmission device 19 drives the rotating seat 21 to move, the rotating seat 21 drives the welding structure 6 to move horizontally, and the bridge steel truss steel is welded in multiple directions, start the rotating motor 28 to drive the rotating seat 29 to rotate, the rotating seat 29 drives the welding structure 6 to rotate horizontally, start the second rotating motor 31 to drive the rotating part 30 to rotate, the rotating part 30 drives the welding structure 6 to rotate, thereby performing multi-angle welding on the bridge steel truss steel.

[0042] Embodiment 3

[0043] Reference Figure 1 - Figure 8 , combining Example 1 and Example 2 to obtain this embodiment.

[0044] The second lifting motor 26, the third screw transmission device 27 and the auxiliary seat 22 limit the position of the bridge steel truss steel. The first lifting motor 10, the first screw transmission device 11, the welding seat 5, the second drive motor 20, the second screw transmission device 19, the rotating seat 21, the rotating motor 28, the rotating seat 29, the second rotating motor 31 and the rotating part 30 control the welding structure 6 to perform all-round welding on the bridge steel truss steel. The first rotating motor 7, the lifting seat 4 and the welding seat 5 cooperate to adjust the orientation of the welding structure 6. The reinforcement 8 and the sliding ring 9 improve the connection stability between the welding seat 5 and the lifting seat 4. The first drive motor 16, the gear 17 and the rack 18 adjust the position of the movable plate 2. The hydraulic cylinder 25, the auxiliary seat 22, the first limit block 23 and the second limit block 24 control the position of the bridge steel truss steel, so that there is no need to turn over the bridge steel truss steel for all-round welding.

[0045] The above embodiments are only used to illustrate the technical method of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical method of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A welding device for bridge steel truss steel, characterized in that: It comprises a support frame (1) and a welding mechanism arranged on the support frame (1); The welding mechanism comprises a plurality of groups of movable plates (2) movably arranged on a support frame (1) and in contact with the lower end of the steel truss of the bridge, and a movable assembly for controlling the movable plates (2) to move horizontally; The welding mechanism further comprises a welding vehicle (3) movably arranged on one side of the support frame (1), a lifting seat (4) movably arranged on the inner side of the welding vehicle (3), a welding seat (5) movably connected to the lifting seat (4), a welding structure (6) movably mounted on the welding seat (5), and auxiliary components symmetrically arranged on both sides of the welding seat (5) and performing auxiliary welding; The welding mechanism further comprises a first rotating motor (7) arranged inside the lifting seat (4) and controlling the welding seat (5) to rotate, a reinforcing member (8) detachably arranged at one end of the welding seat (5), and a sliding ring (9) slidably connecting the reinforcing member (8) and the lifting seat (4).

2. A welding device for bridge steel truss steel according to claim 1, characterized in that: A reinforcing plate that fits the lifting seat (4) is provided at one end of the welding seat (5); the output shaft of the first rotating motor (7) passes through the lifting seat (4) and is connected to a side surface of the reinforcing plate; the vertical section of the welding seat (5) is a square structure; the lifting seat (4) is a cylindrical structure; the reinforcing member (8) is a circular ring cover structure; and the welding seat (5) is fixedly connected to the reinforcing member (8).

3. A welding device for bridge steel truss steel according to claim 2, characterized in that: A first lifting motor (10) and a first screw transmission device (11) connected to the output shaft of the first lifting motor (10) are arranged inside the welding vehicle (3); a first reinforcement strip connected to the lifting seat (4) is vertically arranged on the first screw transmission device (11).

4. A welding device for bridge steel truss steel according to claim 1, characterized in that: The support frame (1) comprises a bottom plate (12), a plurality of groups of side plate beams (13) vertically arranged on the bottom plate (12), and two groups of top plates (14) symmetrically arranged on the side plate beams (13); a reinforcing beam (15) connected to the top plate (14) is arranged at the upper end of the side plate beam (13); and a plurality of groups of movable plates (2) are slidably arranged on the upper end of the side plate beam (13).

5. A welding device for bridge steel truss steel according to claim 4, characterized in that: The moving assembly comprises a plurality of groups of first drive motors (16) vertically arranged on the lower end surface of the moving plate (2) and in contact with the reinforcing beam (15), a gear (17) detachably mounted on the output shaft of the first drive motor (16), and a rack (18) mounted on the outer surface of the side plate beam (13) and meshing with the gear (17).

6. A welding device for bridge steel truss steel according to claim 1, characterized in that: The auxiliary assembly comprises an auxiliary seat (22) symmetrically and movably arranged on the welding vehicle (3), a first limit block (23) vertically fixedly arranged at the lower end of the auxiliary seat (22), and a second limit block (24) movably arranged on one side of the first limit block (23); a hydraulic cylinder (25) for controlling the second limit block (24) to move horizontally is arranged on the auxiliary seat (22); and a sliding block connected to the second limit block (24) is arranged inside the auxiliary seat (22).

7. A welding device for bridge steel truss steel according to claim 6, characterized in that: Two sets of second lifting motors (26) and a third screw transmission device (27) connected to the second lifting motors (26) are symmetrically arranged inside the welding vehicle (3), and a third reinforcement bar connected to the auxiliary seat (22) is vertically arranged on the third screw transmission device (27).

8. A welding device for bridge steel truss steel according to claim 7, characterized in that: A second screw transmission device (19) connected to the welding structure (6) is arranged inside the welding seat (5), and a second drive motor (20) connected to the second screw transmission device (19) is arranged at one end of the welding seat (5) away from the lifting seat (4).

9. A welding device for bridge steel truss steel according to claim 8, characterized in that: The lower end surface of the welding seat (5) is provided with a rotating seat (21) for controlling the welding structure (6) to rotate, the second screw transmission device (19) is vertically provided with a second reinforcement bar connected to the rotating seat (21), and a rotating motor (28) for controlling the welding structure (6) to rotate horizontally is installed inside the rotating seat (21).

10. A welding device for bridge steel truss steel according to claim 9, characterized in that: A rotating seat (29) connected to the output shaft of the rotating motor (28) is arranged below the rotating seat (21); a rotating member (30) detachably connected to the welding structure (6) is rotatably arranged inside the rotating seat (29); and a second rotating motor (31) for controlling the rotating member (30) to rotate is arranged outside the rotating seat (29).

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