A bridge steel structure welding device and welding method

Abstract

The present invention relates to a welding device and a welding method for a bridge steel structure, belonging to the field of welding technology, comprising: a base trench, a first covering layer, a third covering layer and a first isolation trench, wherein the base trench is placed on a foundation and is used to fill a first filling layer, wherein the first filling layer is used to support a top plate; the first covering layer is used to cover the top plate when the top plate is welded, and is used to absorb and conduct the heat generated by welding; the third covering layer is used to cover the bottom plate when the bottom plate is welded, and is used to absorb and conduct the heat generated by welding; the first isolation trench is connected to the joints of two adjacent top plates and the joints of two adjacent bottom plates, and is used to isolate the welds between the top plates and the welds between the bottom plates; the above-mentioned first filling layer, the first covering layer and the third covering layer are all paved with a plurality of heat-conducting particles; the technical problem in the prior art that the mechanical properties after welding are reduced due to the inability to evenly distribute the heat when welding thick steel plates is solved.

Description

Technical Field

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

[0002] The steel structure of a bridge mainly includes steel box girder segments, steel truss members, steel tower segments, steel arch rib segments, etc. Among them, the steel box girder segments have a complex structural composition. The general production process requires splicing and welding to be completed in the workshop and then transported to the construction site for installation.

[0003] The existing patent with application number CN202410634348.X discloses a six-arm welding device for steel bridge production. It includes a support seat, a mirror image support block is fixed on the support seat, the mirror image support block is rotatably connected with a mounting plate, the mounting plate is fixed with a mirror image arc rod, the arc rod is fixed with a guide rod slidably connected with the adjacent mirror image support slide rod, the guide rod is slidably connected with a mirror image connection shell, the lower side of the connection shell is slidably connected with a moving rod, the moving rod is rotatably connected with a rotating cylinder, the rotating cylinder is provided with a rotating wheel, the rotating cylinder is slidably connected with a sliding support rod, the sliding support rod is provided with a rotating wheel, and through the movement of the rotating cylinder and the rotating wheel on the sliding support rod, the bending deformation is gradually made from the middle to the two sides, ensuring the uniformity of the angle change of the bottom plate surface, and improving the stability and accuracy of the device for the reverse bending deformation of the bottom plate.

[0004] The prior art has the following problems:

[0005] Through the extrusion of two extrusion plates and the movement of the rotating cylinder and the rotating wheel on the sliding support rod, the bottom plate is centered and gradually bent and deformed from the middle to both sides. It can only control the external force, but cannot fundamentally solve the deformation caused by welding. The deformation occurs because the internal microstructure of the thick steel plate has a certain degree of unevenness due to the influence of factors such as cooling rate and chemical composition distribution during the production process. This unevenness will affect the efficiency of heat conduction. The decline in thermal conductivity will further affect the heat transfer generated by welding, thereby causing uneven temperature distribution of the weld and the surrounding parent material, hindering the refinement of grains. Coarse grains will reduce the strength, toughness and plasticity of the weld, thereby reducing its mechanical properties. Summary of the invention

[0006] The present invention provides a welding device and a welding method for a bridge steel structure, which can solve the technical problem in the prior art that heat cannot be evenly distributed during welding of thick steel plates, resulting in reduced mechanical properties after welding.

[0007] In order to achieve the above object, the present invention is implemented by the following technical solutions:

[0008] The present application provides a bridge steel structure welding device, which includes a base trench, a first covering layer, a third covering layer and a first isolation trench, wherein the base trench is placed on the foundation and is used to fill the first filling layer, wherein the first filling layer is used to support the top plate; the first covering layer is used to cover the top plate when the top plate is welded, and is used to absorb and conduct the heat generated by welding; the third covering layer is used to cover the bottom plate when the bottom plate is welded, and is used to absorb and conduct the heat generated by welding; the first isolation trench is connected to the joints of two adjacent top plates and the joints of two adjacent bottom plates, and is used to isolate the welds between the top plates and the welds between the bottom plates;

[0009] The first filling layer, the first covering layer and the third covering layer are all formed by laying a plurality of heat-conducting particles.

[0010] Through the above technical scheme, the filling layer and covering layer laid with heat-conductive particles can absorb the heat generated during the welding of thick steel plates and quickly conduct it to the entire steel plate evenly, so that the temperature distribution of the base material is uniform, the degree of grain refinement is improved, and the mechanical properties of the bottom plate and the top plate are enhanced.

[0011] In the present invention, the welding device further comprises a second covering layer and a second isolating groove. The second covering layer is used for welding the top plate, the longitudinal stiffening rib, the middle web and the side web. The second covering layer covers between the top plate and the longitudinal stiffening rib, the middle web and the side web to absorb and conduct the heat generated by welding. The second isolating groove is connected to the weld between the top plate and the longitudinal stiffening rib, the middle web or the side web to isolate the weld between the top plate and the longitudinal stiffening rib, the middle web or the side web.

[0012] The second covering layer is formed by laying out a plurality of heat-conducting particles.

[0013] Through the above technical solution, a covering layer of thermally conductive particles is used to cover the vertically connected plates, thereby reducing the shrinkage of the weld during the cooling process and avoiding shrinkage deformation of the weld and the surrounding area due to uneven shrinkage caused by excessive cooling.

[0014] In the present invention, the welding device further comprises a second filling layer and a third isolation groove. The second filling layer is used for welding the middle inner baffle, the middle web and the side web. The second filling layer is filled between the middle inner baffle, the middle web, the side web and the top plate to absorb and conduct the heat generated by welding. The third isolation groove is connected to the weld between the middle inner baffle and the middle web or the side web to isolate the weld between the middle inner baffle and the middle web or the side web.

[0015] The second filling layer is filled with a plurality of thermally conductive particles.

[0016] Through the above technical solution, a filling layer is formed by heat-conducting particles and filled into the space surrounded by the plates, thereby applying uniform pressure to the plates and fully conducting away the heat generated by welding, further avoiding deformation caused by welding.

[0017] In the present invention, the welding device further comprises an isolation cover, which is connected to the through hole in the middle of the middle inner partition, and the isolation cover isolates the spaces corresponding to the two sides of the middle inner partition.

[0018] Through the above technical solution, an isolation cover is used to make the space enclosed by each steel plate independent, thereby avoiding excessive diffusion of heat and further improving the thermal insulation performance of the second filling layer.

[0019] In the present invention, the welding device further comprises a negative pressure suction chamber, which is arranged at one side of the base groove. The negative pressure suction chamber forms negative pressure through compressed air to transfer the thermal conductive particles between the storage tank and the welding device.

[0020] Through the above technical solution, a negative pressure suction chamber is used to complete the absorption and laying of the thermal conductive particles, thereby improving the convenience of operation.

[0021] In the present invention, the welding device further comprises a gantry robot arm, which is mounted on both sides of the base groove and is connected to a first welding gun, and the first welding gun is used to weld the weld.

[0022] Through the above technical solution, a gantry robot arm is adopted to improve the flexibility of the welding gun.

[0023] In the present invention, the above-mentioned welding device also includes a guide rail and an automatic welding machine, the guide rail is connected to the inner wall of the third isolation groove; the automatic welding machine is self-propelled and connected to the guide rail, and the automatic welding machine is connected to a second welding gun, and the second welding gun welds the vertical weld of the middle inner partition.

[0024] Through the above technical solution, an automatic welding machine is used to reduce the demand for workstations in the subsequent process and improve the overall processing efficiency.

[0025] The present application also provides a bridge steel structure welding method, which uses the above-mentioned bridge steel structure welding device and also includes the following steps:

[0026] Step S1: laying a first filling layer in the base trench, and placing a plurality of top plates upside down on a support plate in the base trench for positioning;

[0027] Step S2: After placing the first isolation groove at the joint between the top plates and connecting it to the top plates by spot welding, the first covering layer is filled on the outside of the first isolation groove, the first covering layer and the first filling layer together wrap the top plates, and then the joint in the first isolation groove is welded by using a first welding gun. After the welding is completed and the heat preservation and cooling are completed, the first covering layer is removed by using a vacuum tube and a negative pressure vacuum chamber, and all the first isolation grooves are removed;

[0028] Step S3: using spot welding to position and connect the longitudinal stiffening ribs, the middle webs, and the side webs to the top plate, and then using spot welding to weld the second isolation grooves to the welds between the longitudinal stiffening ribs and the top plate, the welds between the middle webs and the top plate, and the welds between the side webs and the top plate, and then filling the second covering layer, and after the filling is completed, using the first welding gun to weld the welds, and after the welding is completed, using a vacuum tube and a negative pressure vacuum chamber to remove the second covering layer, and dismantling all the second isolation grooves;

[0029] Step S4: using spot welding to position and connect the middle inner partition and the process partition between the middle web and the side web, using spot welding to position and connect the process partition at both ends of the middle web and the side web, using spot welding to weld the third isolation groove to the weld between the middle inner partition and the middle web, and the weld between the middle inner partition and the side web, and then fill the second filling layer, and after the filling is completed, use the first welding gun to weld the weld, and after the welding is completed, use the vacuum tube and the negative pressure vacuum chamber to remove the second filling layer, and remove all the third isolation grooves and all process partitions;

[0030] Step S5: using spot welding to position and connect multiple bottom plates to the top of the middle web and the side web, and using spot welding to position and connect the first isolation groove to the joint between the two bottom plates, and then laying the third covering layer and welding the joint, and after welding, using a vacuum tube and a negative pressure vacuum chamber to remove the third covering layer, and dismantle all the first isolation grooves;

[0031] Step S6: Perform supplementary welding on the remaining unwelded welds on the inner side of the steel box by manual welding.

[0032] Through the above technical solution, the zoned welding is carried out and the heat-conductive particles are buried, so that the local high temperature generated by the welding can be fully and evenly conducted to the entire steel plate, which reduces the cooling speed after welding and improves the mechanical properties after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 An axonometric diagram of a bridge steel structure welding device provided by an embodiment of the present invention when welding a bottom plate;

[0035] Figure 2 A front view of a bridge steel structure welding device provided by an embodiment of the present invention when welding a bottom plate;

[0036] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0037] Figure 4 for Figure 3 A local enlarged view of F in FIG.

[0038] Figure 5 A top view of a bridge steel structure welding device provided by an embodiment of the present invention when welding a bottom plate;

[0039] Figure 6 for Figure 5 Sectional view at the middle BB;

[0040] Figure 7 for Figure 6 A local enlarged view of G in FIG.

[0041] Figure 8 An axonometric diagram of a bridge steel structure welding device provided by an embodiment of the present invention when welding longitudinal stiffening ribs;

[0042] Fig. 9 A top view of a bridge steel structure welding device provided by an embodiment of the present invention when welding longitudinal stiffening ribs;

[0043] Fig.10 for Fig. 9 Sectional view at CC;

[0044] Fig.11 for Fig.10 A local enlarged view of the H in FIG.

[0045] Fig.12 An axonometric diagram of a bridge steel structure welding device provided by an embodiment of the present invention when welding a middle inner partition;

[0046] Fig.13A top view of a bridge steel structure welding device provided by an embodiment of the present invention when welding a middle inner partition;

[0047] Fig.14 for Fig.13 The partial view after deleting the tracks on both sides from the section view at DD;

[0048] Fig.15 An axonometric diagram of a bridge steel structure welding device provided by an embodiment of the present invention when welding a bottom plate;

[0049] Fig.16 A top view of a bridge steel structure welding device provided by an embodiment of the present invention when welding a bottom plate;

[0050] Fig.17 for Fig.16 The partial view after deleting the tracks on both sides from the sectional view at EE;

[0051] Fig.18 A partial schematic diagram of the installation of the third isolation slot and the guide rail provided in an embodiment of the present invention;

[0052] Fig.19 A partial schematic diagram of a cross-sectional view of a third isolation groove and an automatic welding machine provided in an embodiment of the present invention;

[0053] Fig. 20 A schematic structural diagram of a gantry robot arm and a negative pressure dust suction chamber provided in an embodiment of the present invention.

[0054] Icons: 1-base groove; 101-support plate; 201-first filling layer; 202-first covering layer; 203-second covering layer; 204-second filling layer; 205-third covering layer; 3-first isolation groove; 401-top plate; 402-longitudinal stiffening rib; 403-middle web; 404-side web; 405-process partition; 406-isolation cover; 407-middle inner partition; 408-bottom plate; 501-first welding gun; 6-second isolation groove; 7-third isolation groove; 8-pressure plate; 9-gantry robot arm; 110-guide rail; 111-automatic welding machine; 502-second welding gun; 120-negative pressure suction chamber; 121-dust suction pipe. DETAILED DESCRIPTION

[0055] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0056] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to 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 application.

[0057] 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0058] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be welding, bolt connection, or riveting; it can be fixed connection, detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0059] Embodiment 1:

[0060] Please refer to Figures 1 to 17 as well as Fig. 20 , Figures 1 to 17 as well as Fig. 20 An embodiment of the present application is shown.

[0061] This embodiment provides a bridge steel structure welding device, such as Figure 1 and Fig.15 As shown, it includes a base trench 1, a first covering layer 202, a third covering layer 205 and a first isolation trench 3. Figures 1 to 4 As shown, the base trench 1 is placed on the foundation and is used to fill the first filling layer 201, and the first filling layer 201 is used to support the top plate 401. In order to obtain a more stable support, as shown in FIG. Figure 4 As shown, a plurality of support plates 101 are welded in the base groove 1; Figure 7 As shown, the first covering layer 202 is used to cover the top plate 401 when the top plate 401 is welded, and is used to absorb and conduct the heat generated by welding; Fig.17As shown, the third covering layer 205 is used to cover the bottom plate 408 when the bottom plate 408 is welded, and is used to absorb and conduct the heat generated by welding; the first isolation groove 3 is spot welded at the joints of two adjacent top plates 401 and the joints of two adjacent bottom plates 408, and is used to isolate the welds between the top plates 401 and the welds between the bottom plates 408;

[0062] The first filling layer 201, the first covering layer 202 and the third covering layer 205 are all formed by laying a plurality of thermally conductive particles. Exemplary thermally conductive particles are boron nitride particles. Silicon carbide has high stability at high temperatures and good thermal conductivity.

[0063] Through the above technical scheme, the filling layer and covering layer laid with heat-conductive particles can absorb the heat generated during the welding of thick steel plates and quickly conduct it to the entire steel plate evenly, so that the temperature distribution of the parent material is uniform, the degree of grain refinement is improved, and the mechanical properties of the bottom plate 408 and the top plate 401 are enhanced.

[0064] As a preferred implementation method, Figures 8 to 11 As shown, the welding device further includes a second covering layer 203 and a second isolating groove 6. The second covering layer 203 is used for covering between the top plate 401 and the longitudinal stiffening rib 402, the middle web 403 and the side web 404 when the top plate 401, the longitudinal stiffening rib 402, the middle web 403 and the side web 404 are welded, and is used to absorb and conduct the heat generated by welding; the second isolating groove 6 is spot welded at the weld between the top plate 401 and the longitudinal stiffening rib 402, the middle web 403 or the side web 404, and is used to isolate the weld between the top plate 401 and the longitudinal stiffening rib 402, the middle web 403 or the side web 404;

[0065] The second covering layer 203 is formed by laying a plurality of thermally conductive particles.

[0066] Through the above technical solution, a covering layer of thermally conductive particles is used to cover the vertically connected plates, thereby reducing the shrinkage of the weld during the cooling process and avoiding shrinkage deformation of the weld and the surrounding area due to uneven shrinkage caused by excessive cooling.

[0067] As a preferred implementation method, Figure 12 to Figure 14As shown, the welding device further includes a second filling layer 204 and a third isolation groove 7. The second filling layer 204 is used for welding the middle inner baffle 407, the middle web 403 and the side web 404. The second filling layer 204 is filled between the middle inner baffle 407, the middle web 403, the side web 404 and the top plate 401 to absorb and conduct the heat generated by welding. The third isolation groove 7 is spot welded at the weld between the middle inner baffle 407 and the middle web 403 or the side web 404 to isolate the weld between the middle inner baffle 407 and the middle web 403 or the side web 404.

[0068] The second filling layer 204 is filled with a plurality of thermally conductive particles.

[0069] Through the above technical solution, a filling layer is formed by heat-conducting particles and filled into the space surrounded by the plates, thereby applying uniform pressure to the plates and fully conducting away the heat generated by welding, further avoiding deformation caused by welding.

[0070] As a preferred implementation method, Fig.12 As shown, the welding device further includes an isolation cover 406 , and two isolation covers 406 are connected to each other at the through hole in the middle of the middle inner partition 407 by bolts. The isolation covers 406 isolate the corresponding spaces on both sides of the middle inner partition 407 .

[0071] It should be noted that if Fig.14 As shown, after an independent space is formed by the isolation cover 406, a pressure plate 8 can also be abutted on the second filling layer 204. After the second filling layer 204 is compacted by the pressure plate 8, the pressure applied to each other in adjacent cavities can automatically correct the slight deformation of the steel plate by the pressure.

[0072] Through the above technical solution, the isolation cover 406 is used to make the space enclosed by each steel plate independent, thereby avoiding excessive diffusion of heat and further improving the thermal insulation performance of the second filling layer 204.

[0073] As a preferred implementation method, Fig. 20 As shown, the above-mentioned welding device also includes a negative pressure dust suction chamber 120, which is arranged on one side of the base groove 1. The negative pressure dust suction chamber 120 forms negative pressure through compressed air to transfer the thermal conductive particles between the storage tank and the welding device. The negative pressure dust suction chamber 120 extends into the cavity through the dust suction pipe 121 to absorb or blow out.

[0074] Through the above technical solution, the negative pressure suction chamber 120 is used to complete the absorption and laying of the thermal conductive particles, thereby improving the convenience of operation.

[0075] As a preferred implementation method, Figures 1 to 4As shown, the welding device further includes a gantry robot arm 9, which is mounted on both sides of the base groove 1 and is connected to a first welding gun 501, which is used to weld the weld.

[0076] Through the above technical solution, the gantry robot arm 9 is adopted to improve the flexibility of the welding gun.

[0077] It should be noted that the entire long weld is isolated by an isolation groove before welding, while the special-shaped weld between the longitudinal stiffening rib 402 and the middle inner partition 407 can be welded manually. After the large frame is welded, the deformation caused by local welding will have a slight impact on the overall structure.

[0078] Embodiment 2:

[0079] This embodiment provides a bridge steel structure welding device, the main body of which is substantially the same as that of the embodiment 1, except that Fig.18 and Fig.19 As shown, it also includes a guide rail 110 and an automatic welding machine 111. The guide rail 110 is connected to the inner wall of the third isolation groove 7; the automatic welding machine 111 is connected to the guide rail 110 through a servo motor and rollers for self-propelled movement. The automatic welding machine 111 is connected to a second welding gun 502, and the second welding gun 502 welds the vertical weld of the middle inner partition 407.

[0080] Through the above technical solution, the automatic welding machine 111 is used to reduce the demand for workstations in the subsequent process and improve the overall processing efficiency.

[0081] This embodiment also provides a bridge steel structure welding method, which uses the welding device in the above embodiment 1 and also includes the following steps:

[0082] Step S1: laying a first filling layer 201 in the base trench 1, and placing a plurality of top plates 401 upside down on the support plate 101 in the base trench 1 for positioning;

[0083] Step S2: After placing the first isolation groove 3 at the joint between the top plates 401 and connecting it to the top plate 401 by spot welding, the first covering layer 202 is filled on the outside of the first isolation groove 3, and the first covering layer 202 and the first filling layer 201 together wrap the top plate 401, and then the joint in the first isolation groove 3 is welded by using the first welding gun 501. After the welding is completed and the heat preservation and cooling are completed, the first covering layer 202 is removed by using the dust suction pipe 121 and the negative pressure dust suction chamber 120, and all the first isolation grooves 3 are removed;

[0084] Step S3: Use spot welding to position and connect the longitudinal stiffening rib 402, the middle web 403, and the side web 404 to the top plate 401, and then use spot welding to weld the second isolation groove 6 to the weld between the longitudinal stiffening rib 402 and the top plate 401, the weld between the middle web 403 and the top plate 401, and the weld between the side web 404 and the top plate 401, and then fill the second covering layer 203. After the filling is completed, use the first welding gun 501 to weld the weld. After the welding is completed, use the dust suction pipe 121 and the negative pressure dust suction chamber 120 to remove the second covering layer 203, and remove all the second isolation grooves 6;

[0085] Step S4: using spot welding to position and connect the middle inner partition 407 and the process partition 405 between the middle web 403 and the side web 404, using spot welding to position and connect the process partition 405 at both ends of the middle web 403 and the side web 404, using spot welding to weld the third isolation groove 7 to the weld between the middle inner partition 407 and the middle web 403, and the weld between the middle inner partition 407 and the side web 404, and then fill the second filling layer 204, after the filling is completed, use the first welding gun 501 to weld the weld, after the welding is completed, use the dust suction pipe 121 and the negative pressure dust suction chamber 120 to remove the second filling layer 204, and remove all the third isolation grooves 7 and all the process partitions 405;

[0086] Step S5: spot welding is used to position and connect the plurality of bottom plates 408 to the top of the middle web 403 and the side web 404, and spot welding is used to position and connect the first isolation slots 3 to the joints between the two bottom plates 408, and then the third covering layer 205 is laid and then welded to the joints, and after welding is completed, the third covering layer 205 is removed by using the vacuum tube 121 and the negative pressure vacuum chamber 120, and all the first isolation slots 3 are removed;

[0087] Step S6: Perform supplementary welding on the remaining unwelded welds on the inner side of the steel box by manual welding.

[0088] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope of the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A bridge steel structure welding device, characterized in that: include: A foundation trench (1) is placed on the foundation and is used to fill a first filling layer (201), wherein the first filling layer (201) is used to support a top plate (401); A first covering layer (202) is used to cover the top plate (401) when the top plate (401) is welded, and is used to absorb and conduct heat generated by welding; A third covering layer (205) is used to cover the bottom plate (408) when the bottom plate (408) is welded, and is used to absorb and conduct heat generated by welding; A first isolation groove (3) is arranged around a joint between two adjacent top plates (401) and a joint between two adjacent bottom plates (408), and is used to isolate a weld between two adjacent top plates (401) and a weld between two adjacent bottom plates (408); The first filling layer (201), the first covering layer (202) and the third covering layer (205) are all formed by laying out a plurality of heat-conducting particles; The second filling layer (204) is used for welding the middle inner baffle (407), the middle web (403) and the side web (404), wherein the second filling layer (204) is filled between the middle inner baffle (407), the middle web (403), the side web (404) and the top plate (401) to absorb and conduct heat generated by welding; A third isolation groove (7) is arranged around the weld between the middle inner baffle (407) and the middle web (403), and around the weld between the middle inner baffle (407) and the side web (404), and is used to isolate the weld between the middle inner baffle (407) and the middle web (403), and is used to isolate the weld between the middle inner baffle (407) and the side web (404); The second filling layer (204) is filled with a plurality of heat-conducting particles; A guide rail (110) connected to an inner wall of the third isolation groove (7); An automatic welding machine (111) is self-propelled and connected to the guide rail (110), the automatic welding machine (111) being connected to a second welding gun (502), the second welding gun (502) welding the vertical weld of the middle inner partition (407); An isolation cover (406) is connected to a through hole in the middle of the middle inner partition (407), and the isolation cover (406) isolates corresponding spaces on two sides of the middle inner partition (407); A pressure plate (8) is in contact with the upper side of the second filling layer (204), and the pressure plate (8) applies downward pressure to the second filling layer (204).

2. The bridge steel structure welding device according to claim 1 is characterized in that: Also includes: A second covering layer (203) is used when the top plate (401), the longitudinal stiffening ribs (402), the middle web plate (403) and the side web plate (404) are welded, wherein the second covering layer (203) covers between the top plate (401) and the longitudinal stiffening ribs (402), and between the middle web plate (403) and the side web plate (404), and is used to absorb and conduct heat generated by welding; A second isolation groove (6) is arranged around the weld between the top plate (401) and the longitudinal stiffening rib (402), around the weld between the top plate (401) and the middle web (403), and around the weld between the top plate (401) and the side web (404), and is used to isolate the weld between the top plate (401) and the longitudinal stiffening rib (402), between the top plate (401) and the middle web (403), and between the top plate (401) and the side web (404); The second covering layer (203) is formed by laying out a plurality of heat-conducting particles.

3. The bridge steel structure welding device according to claim 2 is characterized in that: Also includes: A negative pressure dust suction chamber (120) is arranged on one side of the base groove (1), and the negative pressure dust suction chamber (120) forms negative pressure by compressed air to transfer the heat-conductive particles between the storage tank and the welding device.

4. The bridge steel structure welding device according to claim 3 is characterized in that: Also includes: The gantry robot arm (9) is mounted on both sides of the base groove (1) and is connected to a first welding gun (501), wherein the first welding gun (501) performs welding on the weld seam.

5. A bridge steel structure welding method, characterized in that: The bridge steel structure welding device as claimed in claim 4 is used, and further comprises the following steps: Step S1: laying a first filling layer (201) in the base trench (1), and placing a plurality of top plates (401) upside down on the support plate (101) in the base trench (1) for positioning; Step S2: After placing a first isolation groove (3) at the joint between the top plates (401), it is connected to the top plate (401) by spot welding, and then a first covering layer (202) is filled on the outside of the first isolation groove (3), and the first covering layer (202) and the first filling layer (201) together wrap the top plate (401), and then a first welding gun (501) is used to weld the joint in the first isolation groove (3). After the welding is completed and the heat preservation and cooling are carried out, the first covering layer (202) is removed by using a dust suction pipe (121) and a negative pressure dust suction chamber (120), and all the first isolation grooves (3) are removed; Step S3: using spot welding to position and connect the longitudinal stiffening rib (402), the middle web (403), and the side web (404) to the top plate (401), and then using spot welding to weld the second isolation groove (6) to the weld between the longitudinal stiffening rib (402) and the top plate (401), the weld between the middle web (403) and the top plate (401), and the weld between the side web (404) and the top plate (401), and then fill the second covering layer (203). After the filling is completed, the weld is welded using a first welding gun (501). After the welding is completed, the second covering layer (203) is removed using a vacuum tube (121) and a negative pressure vacuum chamber (120), and all the second isolation grooves (6) are removed; Step S4: using spot welding to position and connect the middle inner baffle (407) and the process baffle (405) between the middle web (403) and the side web (404); using spot welding to position and connect the process baffle (405) to both ends of the middle web (403) and the side web (404); using spot welding to weld the third isolation groove (7) to the weld between the middle inner baffle (407) and the middle web (403), and to the weld between the middle inner baffle (407) and the side web (404); then filling the second filling layer (204); after the filling is completed, welding the weld with a first welding gun (501); after the welding is completed, removing the second filling layer (204) with a vacuum tube (121) and a negative pressure vacuum chamber (120); and removing all the third isolation grooves (7) and all the process baffles (405); Step S5: using spot welding to position and connect the plurality of bottom plates (408) to the top of the middle web plate (403) and the side web plate (404), and using spot welding to position and connect the first isolation groove (3) to the joint between the two bottom plates (408), and then laying the third covering layer (205) and welding the joint. After welding, using the dust suction pipe (121) and the negative pressure dust suction chamber (120) to remove the third covering layer (205), and dismantle all the first isolation grooves (3); Step S6: Perform supplementary welding on the remaining unwelded welds on the inner side of the steel box by manual welding.

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