Welding device for steel box girder tied arch bridge construction

Abstract

The invention discloses a welding device for construction of a steel box girder tied arch bridge, relates to the technical field of electric arc welding, and aims to solve the problems that a splicing platform provided in the background technology is narrow in internal space and inconvenient to move, so that the welding efficiency is low, toxic gas generated during welding cannot be adsorbed and purified in time, and the risk that workers inhale the toxic gas exists. According to the scheme, the device comprises a bottom plate, a rotating mechanism is arranged at the top of the bottom plate, and the rotating mechanism comprises a supporting frame connected to the outer wall of the top of the bottom plate through bolts, a sealing plate connected to the inner wall of the upper portion of the supporting frame through bolts and a rotating column. A worker does not need to hold a welding gun by hand, multi-directional and multi-angle welding of a steel structure in a narrow space is achieved, the welding efficiency is improved, poisonous gas generated during welding can be adsorbed and purified in time, the situation that the worker inhales the poisonous gas due to the fact that a large amount of poisonous gas is generated at the same time is avoided, and the environmental protection property is improved.

Description

Technical Field

[0001] The invention relates to the technical field of arc welding, and in particular to a welding device for the construction of a steel box girder tied arch bridge. Background Art

[0002] Arc welding is the most widely used welding method in industrial production. The metal to be welded is used as one electrode and the electrode is used as the other electrode. When the two electrodes are close, an arc is generated. The heat generated by the arc discharge (commonly known as arc combustion) is used to melt the electrode and the workpiece together and form a weld after condensation, thereby obtaining a welding process with a strong joint. Common arc welding methods mainly include metal arc welding (SMAW), submerged arc welding (SAW), tungsten inert gas welding (GTAW or TIG welding), plasma arc welding (PAW) and metal arc welding (GMAW or MIG welding, MAG welding), etc. Among them, tungsten inert gas welding refers to an arc welding method using tungsten or tungsten alloy (thoriated tungsten, cerium tungsten, etc.) as the electrode and argon as the shielding gas, referred to as TIG welding or GTAW welding. During welding, filler metal may or may not be added according to the groove form of the weld and the properties of the weld metal. The filler metal is usually added from the front of the arc. Due to the particularity of aluminum, magnesium and their alloy materials, their welding requires AC tungsten inert gas welding, while other metal materials use DC tungsten inert gas welding.

[0003] As a member of the arch bridge family, the tied arch bridge has the general characteristics of arch bridges and its own unique characteristics. It is a type of bridge that combines the advantages of arch and beam. It combines the two basic structural forms of arch and beam to bear the load together, giving full play to the structural performance and combined effect of beam bending and arch compression. The horizontal thrust at the arch end is borne by the tension rod, so that the arch end support does not generate horizontal thrust. The arch and the chord are connected by vertical rods hinged at both ends, and diagonal rods can also be used instead of straight rods to form a Nelson system. The interior of this arch bridge is an over-static system and the exterior is statically determinate. Therefore, it has no effect on the uneven settlement of piers. The steel box girder, also called steel plate box girder, is a commonly used structural form for large-span bridges and is generally used on bridges with larger spans.

[0004] Based on the existing technology, during the construction of a steel box girder tied arch bridge, it is necessary to build an assembly platform on the open ground in advance for splicing steel structures such as the main beam and the cross beam. After the steel structure is spliced, it is necessary to weld the entire steel structure, and then directly transfer the welded steel structure to the bridge. However, during the use of the steel box girder tied arch bridge welding equipment in the prior art, when welding the steel structure, there are the following problems:

[0005] 1. Only the staff can shuttle inside the assembly platform and weld the steel structure. The internal space of the assembly platform is small and inconvenient to move, resulting in low welding efficiency;

[0006] 2. It can only disperse the gas generated during welding, but cannot timely adsorb and purify the toxic gas generated during welding. There is a risk of workers inhaling toxic gas, and the environmental protection is poor. Summary of the invention

[0007] The present invention provides a welding device for the construction of a steel box girder tie arch bridge, which solves the problems in the prior art that when welding is performed using the steel box girder tie arch bridge welding equipment, the internal space of the assembly platform is small and inconvenient to move, resulting in low welding efficiency, inability to timely adsorb and purify the toxic gases generated during welding, there is a risk of workers inhaling the toxic gases, and the environmental protection is poor.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A welding device for the construction of a steel box girder tie-bar arch bridge comprises a bottom plate, a rotating mechanism is arranged on the top of the bottom plate, the rotating mechanism comprises a support frame connected to the outer wall of the top of the bottom plate by bolts, a sealing plate connected to the inner wall of the upper part of the support frame by bolts, a rotating column penetrating through and connected to the outer wall of the bottom of the sealing plate by a bearing, a rotating table connected to the outer wall of the top end of the rotating column by bolts, and a rotating motor connected to the outer wall of the top of the sealing plate by bolts, the rotating table is provided with an extension mechanism, the extension mechanism comprises a double-axis servo motor connected to the outer wall of the top of the rotating table by bolts, two A lower rocker arm connected to the outer wall of the output shaft of the double-axis servo motor by a key, a servo motor connected to the upper outer wall of one of the lower rocker arms by bolts, a first connecting block connected to one end of the output shaft of the servo motor by bolts, two upper rocker arms rotatably mounted on the upper outer walls of the two lower rocker arms, and connecting plates fixed on the middle outer walls of the two upper rocker arms on both sides, a direction adjustment component is provided between the two upper rocker arms, and the direction adjustment component includes a direction adjustment motor connected to the outer wall of one side of the upper rocker arms by bolts, a second connecting block connected to one end of the output shaft of the direction adjustment motor by bolts, and a first connecting block connected to one end of the output shaft of the servo motor by bolts. A fixed block bolted to the outer wall of one side of the second connecting block, a rotating block rotatably mounted on the outer wall of one side of the upper rocker arm, and a connecting seat fixedly mounted on the outer wall of one side of the rotating block, the connecting seat is provided with a welding assembly, the welding assembly includes a TIG welding gun, an externally threaded barrel rotatably mounted on the outer wall of the TIG welding gun, and a fixed plate fixedly mounted on the outer wall of one end of the TIG welding gun, the connecting seat is provided with an adjustment assembly, the adjustment assembly includes an adjustment motor connected to the outer wall of one side of the connecting seat by bolts and an internally threaded barrel connected to the outer wall of one side of the connecting seat by a bearing, and a purification assembly is provided on the connecting plate The purification component includes an installation box that penetrates and is fixed on the outer wall of one side of the connecting plate, a fixed cover connected to the outer wall of one side of the installation box by bolts, a mounting pipe that penetrates and is fixed on the outer wall of one side of the fixed cover, a ventilation frame slidably sleeved in the installation box, an activated carbon filter element embedded in the ventilation frame, an end cover connected to the outer wall of one side of the installation box by bolts, and a plurality of fans that are respectively connected to the outer wall of one side of the end cover by bolts, a telescopic pipe is fixed on the upper outer wall of one side of the fixing plate, a conveying pipe is fixed on the upper outer wall of the mounting pipe, and an electric welder is connected to the top outer wall of the bottom plate by bolts.

[0010] Preferably, universal wheels with brakes are connected to the outer walls at the four corners of the bottom of the base plate through bolts, and two handles are fixedly provided on the outer wall at the top of the base plate.

[0011] Preferably, the bottom end of the rotating column is connected to the top outer wall of the base plate through a bearing, and a first gear ring is fixedly provided on the lower outer wall of the rotating column, a first gear is fixedly provided on the lower outer wall of the rotating motor output shaft, and the first gear and the first gear ring are meshed with each other to form a transmission fit, an oil filling hole is opened on the top outer wall of the sealing plate, and a sealing plug is embedded in the oil filling hole.

[0012] Preferably, a connecting column is fixedly provided on the middle outer wall on the opposite side of the two lower rocker arms, a mounting groove is opened on the outer wall of one of the upper rocker arms, and the first connecting block is embedded in the mounting groove, and a connecting rod is fixedly provided on the outer wall on the opposite side of the two upper rocker arms.

[0013] Preferably, a fixing groove is formed on an outer wall of one side of the fixing block, and the second connecting block is connected to the fixing groove by bolts.

[0014] Through the above scheme, the first gear is driven to rotate by the rotating motor output shaft, the first gear drives the first gear ring and the rotating table to rotate, and then drives the TIG welding gun to rotate. The rotation of the dual-axis servo motor output shaft drives the two lower rocker arms to rotate a certain angle. At the same time, the rotation of the servo motor output shaft drives the two upper rocker arms to rotate a certain angle, so that the whole can move freely in the assembly platform and weld the steel structure.

[0015] Preferably, the external threaded tube passes through and is sleeved on the outer wall of one side of the connecting seat, two limit rods are fixedly provided on the outer wall of one side of the fixing plate, and one end of the two limit rods respectively passes through and is slidably sleeved on the outer wall of one side of the connecting seat.

[0016] Preferably, a second gear is fixedly provided on the outer wall of one end of the adjusting motor output shaft, the internal threaded barrel is screwed on the outer wall of the external threaded barrel, and a second gear ring is fixedly provided on the outer wall of the internal threaded barrel, and the second gear ring meshes with the first gear to form a transmission fit.

[0017] Through the above scheme, the second gear is driven to rotate by adjusting the motor output shaft, the second gear drives the second gear ring and the internal threaded cylinder to rotate, the internal threaded cylinder drives the external threaded cylinder and the TIG welding gun to move, and at the same time drives the fixed plate and the two limit rods to move, so that the TIG welding gun is moved away from the connecting seat, so that the overall steel structure can be welded in a small space.

[0018] Preferably, two fixing rods are fixedly provided on an outer wall of one side of the fixing cover, and the ventilation frame is fixedly provided on an outer wall at one end of the two fixing rods.

[0019] Preferably, a connecting pipe is fixedly provided on the upper outer wall of the connecting seat, one end of the telescopic pipe is fixedly provided on the outer wall of one end of the connecting pipe, and one end of the conveying pipe is fixedly provided on the outer wall of one end of the connecting pipe.

[0020] Through the above scheme, multiple sets of fans are operated to transport the air at one end of the telescopic tube to the connecting rod, so that the toxic gas generated during welding enters the telescopic tube and then the installation box under the action of negative pressure. Then the ventilation frame and the activated carbon filter element filter, adsorb and purify the dust and gas generated during welding.

[0021] The beneficial effects of the present invention are:

[0022] 1. The output shaft of the rotating motor drives the first gear to rotate, and the first gear drives the first gear ring and the rotating table to rotate, thereby driving the TIG welding gun to rotate. The output shaft of the dual-axis servo motor drives the two lower rocker arms to rotate a certain angle, and at the same time, the output shaft of the servo motor drives the two upper rocker arms to rotate a certain angle, so that the whole can move freely in the assembly platform and weld the steel structure. The output shaft of the adjusting motor drives the second gear to rotate, and the second gear drives the second gear ring and the internal threaded barrel to rotate. The internal threaded barrel drives the external threaded barrel and the TIG welding gun to move, and at the same time drives the fixed plate and the two limit rods to move, thereby making the TIG welding gun away from the connecting seat, so that the whole can weld the steel structure in a small space, without the need for the staff to hold the welding gun, and realize multi-directional and multi-angle welding of the steel structure in a small space, thereby improving the welding efficiency.

[0023] 2. Multiple sets of fans are running to transport the air at one end of the telescopic tube to the connecting rod, so that the toxic gas generated during welding enters the telescopic tube and then the installation box under the action of negative pressure. Then the ventilation frame and activated carbon filter element filter, adsorb and purify the dust and gas generated during welding. The toxic gas generated during welding can be adsorbed and purified in time to avoid the simultaneous generation of a large amount of toxic gas and the inhalation of toxic gas by the staff, thereby improving environmental protection.

[0024] To sum up, the present invention does not require workers to hold welding guns, and can achieve multi-directional and multi-angle welding of steel structures in a narrow space, thereby improving welding efficiency, and can timely adsorb and purify toxic gases generated during welding, thereby avoiding the simultaneous generation of a large amount of toxic gases that cause workers to inhale toxic gases, thereby improving environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The present invention provides a schematic diagram of the overall main structural view of a welding device for the construction of a steel box girder tied arch bridge.

[0026] Figure 2 This is a schematic diagram of the main structure of a rotating mechanism of a welding device for the construction of a steel box girder tied arch bridge proposed by the present invention.

[0027] Figure 3 This is a schematic diagram of the main structure of the extension assembly of a welding device for the construction of a steel box girder tied arch bridge proposed by the present invention.

[0028] Figure 4 This is an exploded view of the extension assembly of a welding device for the construction of a steel box girder tied arch bridge proposed by the present invention.

[0029] Figure 5 This is a schematic diagram of the main structure of the steering assembly of a welding device for the construction of a steel box girder tied arch bridge proposed by the present invention.

[0030] Figure 6 This is a schematic diagram of the main structure of a welding assembly of a welding device for the construction of a steel box girder tied arch bridge proposed by the present invention.

[0031] Figure 7 This is a schematic diagram of the main structure of an adjustment component of a welding device for the construction of a steel box girder tied arch bridge proposed by the present invention.

[0032] Figure 8 This is a schematic diagram of the main structure of a purification component of a welding device for the construction of a steel box girder tied arch bridge proposed by the present invention.

[0033] Fig. 9 The present invention proposes Figure 1 Enlarged structural diagram at A in the middle.

[0034] In the figure: 1, bottom plate; 2, rotating mechanism; 201, support frame; 202, sealing plate; 203, rotating column; 204, first gear ring; 205, rotating table; 206, rotating motor; 207, first gear; 208, sealing plug; 3, extension assembly; 301, dual-axis servo motor; 302, lower rocker arm; 303, servo motor; 304, first connecting block; 305, upper rocker arm; 306, connecting rod; 307, connecting plate; 4, direction adjustment assembly; 401, direction adjustment motor; 402, second connecting block; 403, fixing block; 404, rotating Block; 405, connecting seat; 5, welding assembly; 501, TIG welding gun; 502, external threaded barrel; 503, fixing plate; 504, limiting rod; 6, adjusting assembly; 601, adjusting motor; 602, second gear; 603, internal threaded barrel; 604, second gear ring; 7, purification assembly; 701, installation box; 702, fixing cover; 703, installation pipe; 704, fixing rod; 705, ventilation frame; 706, activated carbon filter element; 707, end cover; 708, fan; 8, telescopic tube; 9, connecting pipe; 10, delivery pipe; 11, electric welding machine. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] Example 1, reference Figure 1-5A welding device for the construction of a steel box girder tied arch bridge, comprising a bottom plate 1 with universal wheels with brakes connected to the outer walls of the four corners of the bottom by bolts, and an electric welder 11 connected to the outer wall of the top of the bottom plate 1 by bolts, a rotating mechanism 2 is provided on the top of the bottom plate 1, and the rotating mechanism 2 comprises a support frame 201 connected to the outer wall of the top of the bottom plate 1 by bolts, a sealing plate 202 connected to the inner wall of the upper part of the support frame 201 by bolts, a rotating column 203 penetrating and connected to the outer wall of the bottom of the sealing plate 202 by a bearing, a rotating table 205 connected to the outer wall of the top of the rotating column 203 by bolts, and a rotating plate 206 connected to the outer wall of the top of the sealing plate 202 by bolts. The bottom end of the rotating column 203 is connected to the top outer wall of the bottom plate 1 through a bearing, a first gear ring 204 is fixedly arranged on the lower outer wall of the rotating column 203, a first gear 207 is fixedly arranged on the lower outer wall of the output shaft of the rotating motor 206, the first gear 207 and the first gear ring 204 are meshed with each other to form a transmission match, an oil filling hole is opened on the top outer wall of the sealing plate 202, a sealing plug 208 is embedded in the oil filling hole, and an extension mechanism 3 is arranged on the rotating table 205, and the extension mechanism 3 includes a double-axis servo motor 301 connected to the top outer wall of the rotating table 205 by bolts, and two double-axis servo motors 301 are connected to the top outer wall of the rotating table 205 by keys. 01 A lower rocker arm 302 on the outer wall of the output shaft, a servo motor 303 connected to the upper outer wall of one of the lower rocker arms 302 by bolts, a first connecting block 304 connected to one end of the output shaft of the servo motor 303 by bolts, two upper rocker arms 305 rotatably mounted on the upper outer walls of the two lower rocker arms 302, and connecting plates 307 fixed on the middle outer walls of the two upper rocker arms 305 on both sides, a connecting column is fixed on the middle outer wall of the opposite side of the two lower rocker arms 302, a mounting groove is opened on the outer wall of one side of the upper rocker arm 305, the first connecting block 304 is embedded in the mounting groove, and the two upper rocker arms 305 on the opposite side are fixed on the middle outer wall of the two upper rocker arms 305. A connecting rod 306 is fixed on the outer wall, and an adjustment component 4 is provided between the two upper rocker arms 305. The adjustment component 4 includes an adjustment motor 401 connected to the outer wall of one of the upper rocker arms 305 by bolts, a second connecting block 402 connected to one end of the output shaft of the adjustment motor 401 by bolts, a fixed block 403 connected to the outer wall of one side of the second connecting block 402 by bolts, a rotating block 404 rotatably installed on the outer wall of one side of the upper rocker arm 305, and a connecting seat 405 fixed on the outer wall of one side of the rotating block 404, a fixing groove is opened on the outer wall of one side of the fixing block 403, and the second connecting block 402 is connected to the fixing groove by bolts.

[0037] Example 2, reference Figure 6-7A welding device for the construction of a steel box girder tied arch bridge also includes a welding assembly 5, which includes a TIG welding gun 501, an externally threaded barrel 502 rotatably mounted on the outer wall of the TIG welding gun 501, and a fixing plate 503 fixedly mounted on the outer wall of one end of the TIG welding gun 501, the externally threaded barrel 502 penetrates and is sleeved on the outer wall of one side of a connecting seat 405, and two limiting rods 504 are fixedly mounted on the outer wall of one side of the fixing plate 503, and one end of the two limiting rods 504 respectively penetrates and is slidably sleeved on the outer wall of one side of the connecting seat 405 On the connecting seat 405, an adjusting component 6 is provided, and the adjusting component 6 includes an adjusting motor 601 connected to the outer wall of one side of the connecting seat 405 by bolts and an internal threaded tube 603 connected to the outer wall of one side of the connecting seat 405 by a bearing. A second gear 602 is fixedly provided on the outer wall of one end of the output shaft of the adjusting motor 601, and the internal threaded tube 603 is screwed on the outer wall of the external threaded tube 502. A second gear ring 604 is fixedly provided on the outer wall of the internal threaded tube 603, and the second gear ring 604 is meshed with the first gear 602 to form a transmission fit.

[0038] Example 3, reference Figure 8-9 A welding device for the construction of a steel box girder tied arch bridge also includes a purification component 7, which includes an installation box 701 that penetrates and is fixed on the outer wall of one side of a connecting plate 307, a fixed cover 702 that is connected to the outer wall of one side of the installation box 701 by bolts, an installation pipe 703 that penetrates and is fixed on the outer wall of one side of the fixed cover 702, a ventilation frame 705 that is slidably sleeved in the installation box 701, an activated carbon filter element 706 that is embedded in the ventilation frame 705, and an end cover 707 that is connected to the outer wall of one side of the installation box 701 by bolts. and a plurality of fans 708 connected to the outer wall of one side of the end cover 707 by bolts respectively, two fixing rods 704 are fixedly arranged on the outer wall of one side of the fixing cover 702, a ventilation frame 705 is fixedly arranged on the outer wall of one end of the two fixing rods 704, a telescopic tube 8 is fixedly arranged on the upper outer wall of one side of the fixing plate 503, a connecting tube 9 is fixedly arranged on the upper outer wall of the connecting seat 405, a conveying tube 10 is fixedly arranged on the upper outer wall of the mounting tube 703, one end of the telescopic tube 8 is fixedly arranged on the outer wall of one end of the connecting tube 9, and one end of the conveying tube 10 is fixedly arranged on the outer wall of one end of the connecting tube 9.

[0039] The output shaft of the rotating motor 206 drives the first gear 207 to rotate, and the first gear 207 drives the first gear ring 204 and the rotating table 205 to rotate, thereby driving the TIG welding gun 501 to rotate. The output shaft of the dual-axis servo motor 301 rotates to drive the two lower rocker arms 302 to rotate a certain angle, and the output shaft of the servo motor 303 rotates to drive the two upper rocker arms 305 to rotate a certain angle. The output shaft of the adjustment motor 401 drives the connecting seat 405 and the TIG welding gun 501 to rotate, thereby realizing the multi-directional adjustment of the TIG welding gun 501. The output shaft of the adjustment motor 601 rotates to drive the second gear 602 to rotate, and the second gear 602 drives the second gear ring 60 4 and the internal threaded barrel 603 rotate, the internal threaded barrel 603 drives the external threaded barrel 502 and the TIG welding gun 501 to move, and at the same time drives the fixing plate 503 and the two limiting rods 504 to move, so that the TIG welding gun 501 is moved away from the connecting seat 405, so that the steel structure can be welded in a small space as a whole, and multiple sets of fans 708 are operated to transport the air at one end of the telescopic tube 8 to the connecting rod 306, so that the toxic gas generated during welding enters the telescopic tube 8 and enters the installation box 701 under the action of negative pressure, and then the ventilation frame 705 and the activated carbon filter element 706 filter, adsorb and purify the dust and gas generated during welding.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A welding device for the construction of a steel box girder tied arch bridge, comprising a bottom plate (1), characterized in that: A rotating mechanism (2) is provided on the top of the bottom plate (1), and the rotating mechanism (2) comprises a support frame (201) connected to the top outer wall of the bottom plate (1) by bolts, a sealing plate (202) connected to the upper inner wall of the support frame (201) by bolts, a rotating column (203) penetrating and connected to the bottom outer wall of the sealing plate (202) by a bearing, a rotating platform (205) connected to the top outer wall of the rotating column (203) by bolts, and a rotating motor (206) connected to the top outer wall of the sealing plate (202) by bolts; The rotating platform (205) is provided with an extension mechanism (3), and the extension mechanism (3) comprises a double-axis servo motor (301) connected to the outer wall of the top of the rotating platform (205) by bolts, two lower rocker arms (302) respectively connected to the outer walls of the output shafts of the double-axis servo motor (301) by keys, a servo motor (303) connected to the upper outer wall of one of the lower rocker arms (302) by bolts, a first connecting block (304) connected to one end of the output shaft of the servo motor (303) by bolts, two upper rocker arms (305) respectively rotatably mounted on the upper outer walls of the two lower rocker arms (302), and connecting plates (307) respectively fixed on the middle outer walls of the two upper rocker arms (305) on both sides; A direction adjustment component (4) is provided between the two upper rocker arms (305), and the direction adjustment component (4) comprises a direction adjustment motor (401) connected to an outer wall of one of the upper rocker arms (305) by bolts, a second connecting block (402) connected to one end of an output shaft of the direction adjustment motor (401) by bolts, a fixing block (403) connected to an outer wall of one side of the second connecting block (402) by bolts, a rotating block (404) rotatably mounted on an outer wall of one side of the upper rocker arm (305), and a connecting seat (405) fixedly arranged on an outer wall of one side of the rotating block (404); The connecting seat (405) is provided with a welding assembly (5), and the welding assembly (5) comprises a TIG welding gun (501), an externally threaded barrel (502) rotatably mounted on the outer wall of the TIG welding gun (501), and a fixing plate (503) fixedly mounted on the outer wall of one end of the TIG welding gun (501); The connecting seat (405) is provided with an adjustment assembly (6), and the adjustment assembly (6) comprises an adjustment motor (601) connected to the outer wall of one side of the connecting seat (405) by bolts and an internal threaded cylinder (603) connected to the outer wall of one side of the connecting seat (405) by a bearing; The connection plate (307) is provided with a purification component (7), and the purification component (7) comprises a mounting box (701) penetrating and fixedly mounted on an outer wall of one side of the connection plate (307), a fixing cover (702) connected to an outer wall of one side of the mounting box (701) by bolts, a mounting pipe (703) penetrating and fixedly mounted on an outer wall of one side of the fixing cover (702), a ventilation frame (705) slidably mounted in the mounting box (701), an activated carbon filter element (706) embedded in the ventilation frame (705), an end cover (707) connected to an outer wall of one side of the mounting box (701) by bolts, and a plurality of fans (708) respectively connected to an outer wall of one side of the end cover (707) by bolts; A telescopic tube (8) is fixedly provided on the upper outer wall of one side of the fixing plate (503), a conveying tube (10) is fixedly provided on the upper outer wall of the mounting tube (703), and an electric welder (11) is connected to the top outer wall of the bottom plate (1) via bolts.

2. A welding device for construction of a steel box girder tied arch bridge according to claim 1, characterized in that: Universal wheels with brakes are connected to the outer walls at the four corners of the bottom of the base plate (1) via bolts, and two handles are fixedly arranged on the outer wall at the top of the base plate (1).

3. A welding device for construction of a steel box girder tied arch bridge according to claim 1, characterized in that: The bottom end of the rotating column (203) is connected to the top outer wall of the bottom plate (1) through a bearing, and a first gear ring (204) is fixedly provided on the lower outer wall of the rotating column (203). A first gear (207) is fixedly provided on the lower outer wall of the output shaft of the rotating motor (206), and the first gear (207) and the first gear ring (204) are meshed with each other to form a transmission fit. An oil filling hole is opened on the top outer wall of the sealing plate (202), and a sealing plug (208) is embedded in the oil filling hole.

4. A welding device for construction of a steel box girder tied arch bridge according to claim 1, characterized in that: A connecting column is fixedly provided on the middle outer wall of the opposite side of the two lower rocker arms (302), a mounting groove is opened on the outer wall of one side of the upper rocker arms (305), and the first connecting block (304) is embedded in the mounting groove, and a connecting rod (306) is fixedly provided on the outer wall of the opposite side of the two upper rocker arms (305).

5. A welding device for construction of a steel box girder tied arch bridge according to claim 1, characterized in that: A fixing groove is formed on an outer wall of one side of the fixing block (403), and the second connecting block (402) is connected to the fixing groove by means of bolts.

6. A welding device for construction of a steel box girder tied arch bridge according to claim 1, characterized in that: The externally threaded cylinder (502) penetrates through and is sleeved on the outer wall of one side of the connecting seat (405), and two limiting rods (504) are fixedly provided on the outer wall of one side of the fixing plate (503), and one end of the two limiting rods (504) respectively penetrates through and is slidably sleeved on the outer wall of one side of the connecting seat (405).

7. A welding device for construction of a steel box girder tied arch bridge according to claim 1, characterized in that: A second gear (602) is fixedly provided on the outer wall of one end of the output shaft of the regulating motor (601), the internal threaded barrel (603) is screwed onto the outer wall of the external threaded barrel (502), and a second gear ring (604) is fixedly provided on the outer wall of the internal threaded barrel (603), and the second gear ring (604) and the first gear (602) are meshed with each other to form a transmission fit.

8. A welding device for construction of a steel box girder tied arch bridge according to claim 1, characterized in that: Two fixing rods (704) are fixedly arranged on an outer wall of one side of the fixing cover (702), and a ventilation frame (705) is fixedly arranged on an outer wall at one end of the two fixing rods (704).

9. A welding device for construction of a steel box girder tied arch bridge according to claim 1, characterized in that: A connecting pipe (9) is fixedly arranged on the upper outer wall of the connecting seat (405), one end of the telescopic pipe (8) is fixedly arranged on the outer wall of one end of the connecting pipe (9), and one end of the conveying pipe (10) is fixedly arranged on the outer wall of one end of the connecting pipe (9).

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