A steel box girder auxiliary welding support frame for road and bridge construction

Abstract

The invention discloses an auxiliary welding support frame for steel box girders used in road and bridge construction in the technical field of road and bridge construction, comprising a guide rail unit, a crane unit and a clamping unit. The guide rail unit is composed of a plurality of rectangular blocks and a single group of soft guide rails. A rack is fixedly installed at the bottom of the inner cavity of the soft guide rail. The crane unit comprises a main rod, a crane frame and a guide wheel. A driving motor is installed on the side wall of the crane frame. A driving gear is installed at the output end of the driving motor. The driving gear meshes with the rack. A clamping unit is fixedly installed at the other end of the main rod. The clamping unit clamps the welding gun rod. The device of the invention manually places rectangular blocks to lay tracks, is magnetically adsorbed on the steel box girder, and is driven by a driving motor to automatically route the wire to weld the steel box girder. The device has convenient installation and compact structure. The routing method is simulated by setting three routing methods to meet the daily welding habits of workers.

Description

Technical Field

[0001] The invention relates to the technical field of road and bridge construction, in particular to an auxiliary assembly welding power-assisting frame of a steel box girder for road and bridge construction. Background Art

[0002] Steel plate box beam is a commonly used structural form in engineering. Steel box beam is a common structural form for large span bridges and is generally used on bridges with larger spans. At present, when people build bridges, they need to assemble steel box beams and then weld the steel box beams in pairs. People usually hold welding guns and climb under the bridge to weld the steel box beam connection positions. During the welding process, the workers need to move constantly to weld at different positions, which makes the welding efficiency low.

[0003] Application number CN202110874024.X discloses an auxiliary welding device for rectangular steel box girders for road and bridge construction, and provides an auxiliary welding device for rectangular steel box girders for road and bridge construction that can automatically weld the connection of steel box girders. An auxiliary welding device for rectangular steel box girders for road and bridge construction includes a mounting plate, a first sliding rod, a sliding sleeve, a first screw rod and a first nut. The first sliding rod is connected between the inner walls of one side of the mounting plate, a sliding sleeve is slidably provided on the first sliding rod, a first screw rod is rotatably provided on the sliding sleeve, and a first nut is threadedly provided on the first screw rod. When the electric When the welding box and the pressure rod move to the high position of the second limit plate, the switch contacts the third limit plate, so that the switch starts the welding box; when the fixing ring, the welding box and the pressure rod move to the low position of the second limit plate, the switch closes the spot welding box. In this way, there is no need to manually operate the welding box. Although the device can automatically weld the connection position of the steel box girder, the device is large in size and is not convenient to install and transport. The welding gun can only weld in a straight line. In daily use, the straight line routing of the welding gun cannot meet all usage environments.

[0004] Based on this, the present invention designs an auxiliary welding support frame for steel box beams used in road and bridge construction to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide an auxiliary welding support frame for steel box girders for road and bridge construction, so as to solve the problem that although the device mentioned in the above background technology can automatically weld the connection positions of the steel box girders, the device is large in size, inconvenient to install and transport, and the welding gun can only weld in a straight line. In daily use, the straight line routing of the welding gun cannot meet all usage environment problems.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an auxiliary welding frame for steel box girders for road and bridge construction, comprising a guide rail unit, a crane unit, and a clamping unit, wherein the guide rail unit is composed of a plurality of groups of rectangular blocks and a single group of soft guide rails, a rack is fixedly installed at the bottom of the inner cavity of the soft guide rail, the crane unit comprises a main rod, a crane frame, and a guide wheel, the guide wheel is installed at one end of the main rod and rotates with the main rod, the crane frame slides with the rectangular block, a cavity block is fixedly installed on the outer wall of the main rod, the cavity block is located in the crane frame and cooperates with the crane frame, a driving motor is installed on the side wall of the crane frame, a driving gear is installed on the output end of the driving motor, the driving gear is meshed with the rack, and a clamping unit is fixedly installed on the other end of the main rod, and the clamping unit clamps the welding gun rod.

[0007] Preferably, a front end hole is opened at the front end of the main rod, an electromagnet is installed in the inner cavity of the front end hole, the electromagnet is magnetically adsorbed to the front end shaft, the front end shaft is slidably fitted in the front end hole, a spring is fixedly installed between the front end shaft and the inner wall of the front end hole, and an installation shaft is fixedly installed at the other end of the front end shaft, and the installation shaft is used for installing and fixing the clamping unit.

[0008] Preferably, the outer wall of the installation shaft on the side close to the front end shaft is threadedly matched with an adjusting spiral barrel, and the adjusting spiral barrel cooperates with the main rod.

[0009] The cam is provided with a plurality of outer walls, and the outer walls of the cam are provided with a plurality of outer walls, and the outer walls of the cam are provided with a plurality of outer walls, and the outer walls of the cam are provided with a plurality of outer walls.

[0010] Preferably, a change-of-direction box is fixedly installed on the side wall of the traveling frame, the driving motor is installed on the outer wall of the change-of-direction box, a No. 1 shaft is fixedly installed on the output end of the driving motor, a No. 2 shaft is fixedly installed on the outer wall of the driving gear, a No. 3 shaft is longitudinally installed in the inner cavity of the change-of-direction box, the bottom end of the No. 3 shaft is meshed with the No. 1 shaft and the No. 2 shaft respectively, a No. 4 shaft is also longitudinally installed in the inner cavity of the change-of-direction box, the No. 3 shaft and the No. 4 shaft are concentric shafts, the No. 4 shaft is installed directly above the No. 3 shaft, and the No. 3 shaft and the No. 4 shaft are meshed with each other. A connecting tube is sleeved on the outside of the connection of the No. 4 shaft, and the connecting tube slides longitudinally along the axes of the No. 3 shaft and the No. 4 shaft. The inner wall of the connecting tube is evenly provided with internal teeth, and the top of the No. 3 shaft and the outer wall of the bottom of the No. 4 shaft are evenly provided with No. 1 external teeth and No. 2 external teeth, and the No. 1 external teeth and No. 2 external teeth cooperate with the inner teeth. A turntable is fixedly installed on the top of the No. 4 shaft through the top of the change-over box, and a guide shaft is fixedly installed on the top of the edge of the turntable, and the top of the guide shaft is inserted into the outer wall of the main rod and connected with the main rod.

[0011] Preferably, the outer wall of the connecting tube is rotatably fitted with a bracket ring, an operating rod is fixedly installed on the outer wall of the bracket ring, the operating rod passes through the outer wall of the change box, two groups of locking sleeves are fixedly installed on the inner wall of the change box, and locking shafts are installed on the upper and lower walls of the operating rod, and the locking shafts are interference fit with the locking sleeves.

[0012] Preferably, a plurality of groups of positioning half grooves are evenly arranged at the bottom of the inner cavity of the traveling frame, and a plurality of groups of protrusions are fixedly installed at the bottom of the cavity block, and the protrusions cooperate with the positioning half grooves.

[0013] Preferably, connectors are fixedly installed on both sides of the bottom of the rectangular block, a small shaft is inserted into the bottom side wall of the soft guide rail, the small shaft passes through the soft guide rail and is connected to two adjacent groups of connectors, and a permanent magnet is installed in the bottom inner cavity of the rectangular block.

[0014] Preferably, a counterweight handle is fixedly mounted on the outer wall of the guide wheel.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: the device of the present invention manually places rectangular blocks, lays tracks, is magnetically adsorbed on the steel box girder, and is driven by a driving motor to automatically route the wire to weld the steel box girder. The device is easy to install and has a compact structure. By setting three routing methods, the welding gun can adapt to welds of different widths during movement. This is different from the professional manual operation method in actual use, but it simulates the same routing method to meet the workers' daily welding habits. Users can choose a suitable welding routing method according to actual conditions, which is in line with actual use and has good prospects for use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 This is a schematic diagram of the main viewing angle structure of the present invention;

[0018] Figure 2 It is a schematic diagram of the structure of the present invention from a top view;

[0019] Figure 3 It is a schematic diagram of the structure of the present invention from a side perspective;

[0020] Figure 4 This is a schematic diagram of the inner cavity of the fixed box of the present invention;

[0021] Figure 5 It is a schematic diagram of the first cross-sectional structure of the direction-changing box of the present invention;

[0022] Figure 6 It is a second cross-sectional structural schematic diagram of the direction-changing box of the present invention;

[0023] Figure 7 This is a schematic diagram of the inner cavity structure of the main rod of the present invention;

[0024] Figure 8 This is a schematic diagram of the inner cavity structure of a rectangular block of the present invention;

[0025] Fig. 9 This is a schematic diagram of the welding gun wiring of the present invention.

[0026] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0027] 1-main rod, 2-travel frame, 3-guide wheel, 4-change box, 5-welding gun rod, 6-fixed box, 7-erection ring, 8-drive motor, 9-counterweight handle, 10-rectangular block, 11-soft guide rail, 12-cavity block, 13-axis No. 3, 14-axis No. 4, 15-external gear No. 2, 16-external gear No. 1, 17-connecting cylinder, 18-bracket ring, 19-operating rod, 20-locking shaft, 21-locking sleeve, 22-turntable, 23-guide shaft, 24-positioning semi- Slot, 25-No. 1 shaft, 26-No. 2 shaft, 27-driving gear, 28-bearing, 29-electromagnet, 30-front end shaft, 31-adjusting spiral cylinder, 32-positioning inner ring, 33-installing shaft, 34-thrust cone cylinder, 35-clamping knob, 36-spring, 37-small shaft, 38-rack, 39-permanent magnet, 40-connector, 41-rebound rod, 42-positioning roller, 43-baffle, 44-fixed block, 45-reset spring, 46-movable block. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not 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.

[0029] See also Figure 1-9 The present invention provides a technical solution: an auxiliary welding support frame for steel box beams used in road and bridge construction, comprising a guide rail unit, a crane unit, and a clamping unit. The guide rail unit is composed of a plurality of rectangular blocks 10 and a single set of soft guide rails 11. A rack 38 is fixedly installed at the bottom of the inner cavity of the soft guide rail 11. The crane unit comprises a main rod 1, a crane frame 2, and a guide wheel 3. The guide wheel 3 is installed at one end of the main rod 1 and rotates with the main rod 1. The crane frame 2 slides with the rectangular block 10. A cavity block 12 is fixedly installed on the outer wall of the main rod 1. The cavity block 12 is located in the crane frame and cooperates with the crane frame 2. A driving motor 8 is installed on the side wall of the crane frame 2. A driving gear 27 is installed at the output end of the driving motor. The driving gear 27 is meshed with the rack 38. A clamping unit is fixedly installed at the other end of the main rod 1, and the clamping unit clamps the welding gun rod 5.

[0030] Among them, the front end of the main rod 1 is provided with a front end hole, an electromagnet 29 is installed in the inner cavity of the front end hole, the electromagnet 29 is magnetically adsorbed with the front end shaft 30, the front end hole is slidably matched with the front end shaft 30, a spring 36 is fixedly installed between the front end shaft 30 and the inner wall of the front end hole, and the other end of the front end shaft 30 is fixedly installed with a mounting shaft 33, and the mounting shaft 33 is used for mounting and fixing the clamping unit;

[0031] The outer wall of the mounting shaft 33 near the front end shaft is threadedly matched with an adjusting spiral barrel 31, and the adjusting spiral barrel 31 cooperates with the main rod 1;

[0032] The clamping unit includes a fixed box 6, a back-up rod 41, a thrust cone 34, a mounting ring 7 and a clamping knob 35. The sliding cooperation of the mounting shaft 33 is provided with a positioning inner ring 32. The fixed box 6 is fixedly sleeved on the outer wall of the positioning inner ring 32. The outer walls of both sides of the mounting shaft 33 are sleeved with thrust cones 34. The clamping knob 35 is provided with two sides respectively installed on both sides of the fixed box 6 and cooperated with the thrust cone 34. The outer wall of the fixed box 6 is fixedly installed with a mounting ring 7. The inner cavity of the mounting ring 7 is inserted into the front end of the welding gun rod 5. The back-up rod 41 is provided with a mounting ring 7. 1 is installed on the side wall of the fixed box 6, a positioning roller 42 is rotatably sleeved on the top outer wall of the return rod 41, and the rear end of the welding gun rod 5 is clamped between the positioning roller 42 and the top of the fixed box 6. A baffle 43 is fixedly installed on the top side wall of the return rod 41, and the bottom end of the return rod 41 is inserted into the inner cavity hole of the fixed box 6. Two groups of fixed blocks 44 are symmetrically installed on the inner wall of the inner cavity hole. Two groups of movable blocks 46 are symmetrically fixedly installed on the outer wall of the bottom end of the return rod 41, and two groups of reset springs 45 are arranged between the fixed block 44 and the movable block 46;

[0033] The side wall of the traveling frame 2 is fixedly mounted with a change box 4, the driving motor 8 is mounted on the outer wall of the change box 4, the output end of the driving motor 8 is fixedly mounted with a No. 1 shaft 25, the outer wall of the driving gear 27 is fixedly mounted with a No. 2 shaft 26, the inner cavity of the change box 4 is longitudinally mounted with a No. 3 shaft 13, the bottom end of the No. 3 shaft 13 is meshed with the No. 1 shaft 25 and the No. 2 shaft 26 respectively, the inner cavity of the change box 4 is also longitudinally mounted with a No. 4 shaft 14, the No. 3 shaft 13 and the No. 4 shaft 14 are concentric shafts, the No. 4 shaft 14 is mounted directly above the No. 3 shaft 13, and the connection between the No. 3 shaft 13 and the No. 4 shaft 14 A connecting tube 17 is sleeved on the outside of the joint, and the connecting tube 17 slides longitudinally along the axis of the No. 3 shaft 13 and the No. 4 shaft 14. The inner wall of the connecting tube 17 is evenly provided with internal teeth. The top of the No. 3 shaft 13 and the outer wall of the bottom of the No. 4 shaft 14 are evenly provided with No. 1 external teeth 16 and No. 2 external teeth 15. The No. 1 external teeth 16 and No. 2 external teeth 15 cooperate with the internal teeth. The top of the No. 4 shaft 14 passes through the top of the change-direction box 4, and a rotating disk 22 is fixedly installed. A guide shaft 23 is fixedly installed on the top of the edge of the rotating disk 22. The top of the guide shaft 23 is inserted into the outer wall of the main rod 1 and plugged into the main rod 1.

[0034] The outer wall of the connecting tube 17 is rotatably matched with a bracket ring 18, and an operating rod 19 is fixedly installed on the outer wall of the bracket ring 18. The operating rod 19 passes through the outer wall of the change box 4, and two sets of locking sleeves 21 are fixedly installed on the inner wall of the change box 4. The upper and lower walls of the operating rod 19 are installed with locking shafts 20, and the locking shaft 20 and the locking sleeves 21 are interference fit;

[0035] The bottom of the inner cavity of the traveling frame 2 is evenly provided with a plurality of groups of positioning half grooves 24, and the bottom of the cavity block 12 is fixedly provided with a plurality of groups of protrusions, which cooperate with the positioning half grooves 24;

[0036] Connectors 40 are fixedly installed on both sides of the bottom of the rectangular block 10, and a small shaft 37 is inserted into the bottom side wall of the flexible guide rail 11. The small shaft 37 penetrates the flexible guide rail 11 and is connected to two adjacent sets of connectors 40. A permanent magnet 39 is installed in the bottom inner cavity of the rectangular block 10.

[0037] A counterweight handle 9 is fixedly mounted on the outer wall of the guide wheel 3 ; a bearing bush 28 is arranged between the guide wheel 3 and the main rod 1 .

[0038] A specific application of this embodiment is: guide rail unit: by connecting a plurality of groups of rectangular blocks 10 through the cooperation of a small shaft 37 and a connector 40, and allowing the small shaft 37 to penetrate the inner cavity of the soft guide rail 11, so that the permanent magnet 39 in the small shaft 37 is adsorbed on the outer wall of the steel box beam, the soft guide rail 11 can be laid along the weld of the steel box beam, so as to facilitate driving the welding gun to work along the weld;

[0039] Clamping unit: by sleeve-mounting the fixed box 6 on the outer wall of the mounting shaft 33, the fixed box 6 is adjusted to the top of the weld, and the thrust cone 34 and the thrust cone 35 are sequentially installed on both sides, and the thrust cone 35 is rotated and fixed to the two ends of the positioning inner ring 32 through the extrusion between the thrust cone 35 and the thrust cone 34, and the position of the fixed box 6 is clamped, and the return rod 41 is manually rotated to make the movable block 46 compress the reset spring 45, and the welding gun rod 5 is placed in the mounting ring 7, and the reset spring 5 is clamped through the action of the reset spring 45, and the position of the welding gun is fixed, so that the end of the welding gun is aligned with the weld.

[0040] Driving unit: Routing a, by starting the driving motor 8, the driving motor 8 drives the driving gear 27, so that the traveling frame 2 can slide straight on the top of the soft guide rail 11, and the lower locking shaft 20 is inserted into the lower locking sleeve 21, so that the locking sleeve 17 is separated from the second outer tooth 15, and the position of the main rod 1 is fixed by the cooperation of the protrusion and the positioning half groove 24. Under the power of the guide wheel 3, the welding gun at the end of the main rod 1 is driven to move forward in a straight line. Under the operation of the welding gun, fine welds can be welded along the preset track;

[0041] Routing b, by starting the drive motor 8, the drive motor 8 drives the drive gear 27, so that the traveling frame 2 can slide straight on the top of the soft guide rail 11, and the lower locking shaft 20 is inserted into the lower locking sleeve 21 to separate the connecting tube 17 from the second outer tooth 15, and the position of the main rod 1 is fixed by the cooperation between the protrusion and the positioning half groove 24. Under the power of the guide wheel 3, the welding gun at the end of the main rod 1 is driven to move forward in a straight line, and at the same time, the electromagnet 29 is intermittently energized to make the front end shaft 30 slide in the front end hole of the main rod 1, driving the installation shaft 33 and the welding gun rod 5 fixed on the installation shaft 33 to move horizontally left and right in the process of the foreground, so as to realize the routing of form b and weld a wider weld;

[0042] Routing c, by starting the drive motor 8, the drive motor 8 drives the drive gear 27 to slide the carriage 2 on the top of the soft guide rail 11 in a straight line, and by toggling the operating lever 19, the upper locking shaft 20 is inserted into the upper locking sleeve 21, so that the connecting tube 17 is combined with the second outer tooth 15, and the third shaft 13 drives the fourth shaft 14 to rotate, so that the guide shaft 23 drives the main rod 1 to make a circular motion, and by driving the cavity block 12 to move in the carriage 2, and the protrusion and the positioning half groove 24 are separated, the welding gun at the end of the main rod 1 is driven to make a circular motion during the forward process, so as to realize the routing of c form and weld a wider weld;

[0043] The device manually places rectangular blocks 10, lays tracks, and is magnetically adsorbed on a steel box girder. The device drives the automatic routing by a driving motor 8 to weld the steel box girder. The device is easy to install and has a compact structure. By setting three routing methods, the welding gun can adapt to welds of different widths during movement. This is different from the professional manual operation method in actual use, but it simulates the same routing method to meet the workers' daily welding habits. Users can choose a suitable welding routing method according to actual conditions, which is in line with actual use and has a good prospect of use.

[0044] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0045] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A steel box girder auxiliary welding support frame for road and bridge construction, characterized in that: It comprises a guide rail unit, a crane unit and a clamping unit. The guide rail unit is composed of a plurality of groups of rectangular blocks (10) and a single group of soft guide rails (11). A rack (38) is fixedly installed at the bottom of the inner cavity of the soft guide rail (11). The crane unit comprises a main rod (1), a crane frame (2) and a guide wheel (3). The guide wheel (3) is installed at one end of the main rod (1) and is rotatably matched with the main rod (1). The crane frame (2) is slidably matched with the rectangular block (10). A cavity block (12) is fixedly installed on the outer wall of the main rod (1). The cavity block (12) is located in the crane frame and is matched with the crane frame (2). A driving motor (8) is installed on the side wall of the crane frame (2). A driving gear (27) is installed at the output end of the driving motor. The driving gear (27) is meshed with the rack (38). A clamping unit is fixedly installed at the other end of the main rod (1). The clamping unit clamps the welding gun rod (5). A front end hole is provided at the front end of the main rod (1), an electromagnet (29) is installed in the inner cavity of the front end hole, the electromagnet (29) is magnetically attracted to the front end shaft (30), the front end shaft (30) is slidably fitted in the front end hole, a spring (36) is fixedly installed between the front end shaft (30) and the inner wall of the front end hole, and a mounting shaft (33) is fixedly installed at the other end of the front end shaft (30), and the mounting shaft (33) is used for mounting and fixing the clamping unit; The clamping unit comprises a fixed box (6), a return rod (41), a thrust cone (34), a mounting ring (7) and a clamping knob (35); the mounting shaft (33) is slidably matched with a positioning inner ring (32); the fixed box (6) is fixedly sleeved on the outer wall of the positioning inner ring (32); both sides of the outer wall of the mounting shaft (33) are sleeved with thrust cones (34); the clamping knob (35) is provided with two sides respectively mounted on both sides of the fixed box (6) and matched with the thrust cone (34); the outer wall of the fixed box (6) is fixedly mounted with a mounting ring (7); the inner cavity of the mounting ring (7) is inserted into the front end of the welding gun rod (5); the return rod (41) is fixedly mounted on the outer wall of the fixed box (6); the inner cavity of the mounting ring (7) is inserted into the front end of the welding gun rod (5); The rod (41) is mounted on the side wall of the fixed box (6); a locking roller (42) is rotatably sleeved on the top outer wall of the return rod (41); the locking roller (42) and the top of the fixed box (6) clamp the rear end of the welding gun rod (5); a baffle (43) is fixedly mounted on the top side wall of the return rod (41); the bottom end of the return rod (41) is inserted into the inner cavity hole of the fixed box (6); two groups of fixed blocks (44) are symmetrically mounted on the inner wall of the inner cavity hole; two groups of movable blocks (46) are symmetrically fixedly mounted on the bottom outer wall of the return rod (41); and two groups of return springs (45) are arranged between the fixed blocks (44) and the movable blocks (46).

2. The auxiliary welding support frame for steel box beams used in road and bridge construction according to claim 1 is characterized in that: An outer wall of the installation shaft (33) close to the front end shaft is threadedly matched with an adjusting spiral barrel (31), and the adjusting spiral barrel (31) cooperates with the main rod (1).

3. The auxiliary welding support frame for steel box beams for road and bridge construction according to claim 1 is characterized in that: A change-of-direction box (4) is fixedly mounted on the side wall of the traveling frame (2); the driving motor (8) is mounted on the outer wall of the change-of-direction box (4); a first shaft (25) is fixedly mounted on the output end of the driving motor (8); a second shaft (26) is fixedly mounted on the outer wall of the driving gear (27); a third shaft (13) is longitudinally mounted in the inner cavity of the change-of-direction box (4); the bottom end of the third shaft (13) is meshed with the first shaft (25) and the second shaft (26) respectively; a fourth shaft (14) is longitudinally mounted in the inner cavity of the change-of-direction box (4); the third shaft (13) and the fourth shaft (14) are coaxial shafts; the fourth shaft (14) is mounted directly above the third shaft (13); the third shaft (13) and the fourth shaft (14) are coaxially mounted on the inner cavity of the change-of-direction box (4); A connecting tube (17) is sleeved on the outside of the connection of the third shaft (13) and the fourth shaft (14), and the connecting tube (17) slides longitudinally along the axis of the third shaft (13) and the fourth shaft (14). The inner wall of the connecting tube (17) is evenly provided with internal teeth. The top of the third shaft (13) and the outer wall of the bottom of the fourth shaft (14) are evenly provided with a first external tooth (16) and a second external tooth (15). The first external tooth (16) and the second external tooth (15) cooperate with the internal teeth. The top of the fourth shaft (14) passes through the top of the change-direction box (4) and is fixedly installed with a turntable (22). The top of the edge of the turntable (22) is fixedly installed with a guide shaft (23). The top of the guide shaft (23) is inserted into the outer wall of the main rod (1) and plugged into the main rod (1).

4. The auxiliary welding support frame for steel box beams for road and bridge construction according to claim 3 is characterized in that: The outer wall of the connecting tube (17) is rotatably matched with a bracket ring (18), the outer wall of the bracket ring (18) is fixedly mounted with an operating rod (19), the operating rod (19) passes through the outer wall of the direction-changing box (4), the inner wall of the direction-changing box (4) is fixedly mounted with two groups of locking sleeves (21), the upper and lower walls of the operating rod (19) are mounted with locking shafts (20), and the locking shafts (20) are interference-fitted with the locking sleeves (21).

5. The auxiliary welding support frame for steel box beams used in road and bridge construction according to claim 1 is characterized in that: The bottom of the inner cavity of the traveling frame (2) is evenly provided with a plurality of groups of positioning half grooves (24), and the bottom of the cavity block (12) is fixedly installed with a plurality of groups of protrusions, and the protrusions cooperate with the positioning half grooves (24).

6. The auxiliary welding support frame for steel box beams used in road and bridge construction according to claim 1 is characterized in that: Connectors (40) are fixedly mounted on both sides of the bottom of the rectangular block (10), a small shaft (37) is inserted into the bottom side wall of the flexible guide rail (11), the small shaft (37) penetrates the flexible guide rail (11) and is connected to two adjacent groups of connectors (40), and a permanent magnet (39) is mounted in the bottom inner cavity of the rectangular block (10).

7. The auxiliary welding support frame for steel box beams used in road and bridge construction according to claim 1 is characterized in that: A counterweight handle (9) is fixedly mounted on the outer wall of the guide wheel (3).

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