Welding assembly of box beam

Abstract

The utility model discloses a welding assembly of a box beam, and belongs to the technical field of steel structure machining. Comprising a support, a mounting base, a welding gun, a recycling suction nozzle, a material pressing plate, two vertical pulleys and two transverse pulleys, the support comprises a top plate, two side plates, a fixing rod, an adjusting fixing part, a welding gun buffering structure, a pressing plate buffering structure and a vertical buffering structure which are arranged in the front-back direction, notches are formed in the bottoms of the side plates, the pressing plate is located in the notches and can move outwards, and the two vertical pulleys are arranged at the bottoms of the two side plates respectively and located on the outer sides of the notches. The two transverse pulleys are arranged at the bottoms of the two side plates respectively and located on the inner sides of the notches, the fixing rods are rotationally arranged on the side plates, the welding gun is located between the two side plates and adjustably fixed to the fixing rods through the adjusting fixing pieces, and the recycling suction nozzle is fixed to the top plate or the side plate on the rear side through the supporting frame. The welding gun and the material pressing plate can be adaptively adjusted, so that the welding gun and the material pressing plate are attached to the box beam and are prevented from being damaged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of steel structure processing, and particularly relates to a welding assembly of a box girder, which can be adaptively adjusted. BACKGROUND

[0002] In the manufacturing process of large steel structure equipment, there is a large amount of welding work of box girders, and in these structures, the main welding seams are long and straight; for the same fillet weld, the method of submerged arc welding is often used. In the prior art, when a flat fillet weld is welded by using a submerged arc welding machine, in order to achieve a good weld, the requirements for the end of the welding wire and the position of the weld to be welded are relatively high, and the application and recovery of the welding flux and the feeding of the welding wire are also crucial.

[0003] For example, the patent with the application number CN201720244149.3 discloses a box girder submerged arc welding machine, which comprises a Y-axis guide rail and a rack slidably installed on the Y-axis guide rail. The rack is provided with an X-axis sliding arm, and a welding device is slidably installed on the X-axis sliding arm. The welding device comprises a hopper for storing welding flux, a wire feeding group and a welding trolley that can roll on the box girder. A welding torch is arranged on the welding trolley, and the wire feeding group is installed on the welding trolley and connected to the welding torch at the output end. The output end of the hopper is installed on the welding trolley and located at the front end in the forward direction of the welding torch. The hopper is provided with a recovery group for recovering the welding flux, and the input end of the recovery group is arranged at the rear end of the welding trolley.

[0004] For example, the patent with the application number CN202122408833.X discloses a multifunctional welding device, which comprises a rack, a welding frame installed on the rack, a welding torch vertically installed on the welding frame, a wire feeding mechanism arranged above the welding torch, a coarse adjustment mechanism and a fine adjustment mechanism. The coarse adjustment mechanism is connected to the welding frame and is used to adjust the position of the welding frame in the up-down and front-rear directions. The fine adjustment mechanism is connected to the welding torch and is used to adjust the position of the welding torch in the front-rear direction and the deflection angle of the welding torch. The bottom of the welding frame is provided with a trolley, and the trolley comprises a trolley plate, a vertical first rotating wheel rotatably installed on the front side of the trolley plate, and a horizontal second rotating wheel rotatably installed on the bottom of the rear side of the trolley plate.

[0005] A patent with application number CN201822029888.8 discloses a portal frame welding machine, which comprises a portal frame, a transverse sliding plate mechanism, a lifting column mechanism, an electrical controller and a welding device. Two transverse sliding plate mechanisms are arranged on the portal frame, and each of the two transverse sliding plate mechanisms is provided with a lifting column mechanism. The lower ends of the two lifting column mechanisms are provided with welding mechanisms, and the two welding mechanisms are arranged oppositely. The transverse sliding plate mechanism and the lifting column mechanism are connected to the electrical controller, and the electrical controller is used for controlling the movement of the transverse sliding plate mechanism and the lifting column mechanism. The portal frame comprises a support column, a portal frame cross beam, a transverse guide rail and a transverse rack. Two support columns are arranged vertically, and the portal frame cross beam is arranged between the top portions of the two support columns. Two transverse guide rails are fixedly arranged on the side surfaces of the portal frame cross beam along the length direction of the portal frame cross beam, and a transverse rack is fixedly arranged on the side surface of one transverse guide rail. The transverse sliding plate mechanism comprises a transverse sliding plate, a motor, a transverse transmission gear and a transverse pulley. The output end of the motor is arranged through the transverse sliding plate, and the output end of the motor is provided with a transverse transmission gear. The transverse transmission gear is engaged with the transverse rack. Two rows of transverse pulleys are arranged on one surface of the transverse sliding plate, and the transverse pulleys are respectively clamped between the two transverse guide rails. The lifting column mechanism comprises a lifting column, a lifting column lifting rack, a lifting column positioning wheel, a lifting column vertical movement guide rail, a lifting column motor and a vertical transmission gear. The lifting column lifting rack is fixedly arranged on the side surface of the lifting column along the length direction of the lifting column. The lifting column vertical movement guide rails are arranged on the two sides of the lifting column along the length direction. Two rows of lifting column positioning wheels are arranged on the other surface of the transverse sliding plate, and the lifting column vertical movement guide rails on the two sides of the lifting column are clamped between the two rows of lifting column positioning wheels. The top portion of the transverse sliding plate is provided with a lifting column motor, and the output end of the lifting column motor is provided with a vertical transmission gear. The vertical transmission gear is engaged with the lifting column lifting rack. The welding device comprises a horizontal lead screw, a horizontal lead screw sleeve, a horizontal lead screw adjusting knob, a vertical lead screw adjusting knob, a vertical lead screw, a vertical lead screw sleeve, a welding gun and a welding gun clamping device. The horizontal lead screw is arranged vertically with the lifting column. The horizontal lead screw sleeve is sleeved outside the horizontal lead screw. The vertical lead screw sleeve is fixedly arranged on the horizontal lead screw sleeve. The vertical lead screw is arranged in the vertical lead screw sleeve. The horizontal lead screw adjusting knob is arranged on the horizontal lead screw sleeve. The vertical lead screw adjusting knob is arranged on the vertical lead screw sleeve. The end portion of the vertical lead screw is provided with the welding gun clamping device, and the welding gun clamping device clamps the welding gun.

[0006] The existing welding assembly comprises a support and a mounting seat, a welding gun, a recycling suction nozzle, a pressing plate, two vertical pulleys and two horizontal pulleys, etc. The recycling suction nozzle is located directly behind the welding gun. The pressing plate is arranged in the front-rear direction and abuts against the outside of the box beam. The two vertical pulleys are arranged side by side in the front-rear direction and vertically abut against the outside of the box beam. The two horizontal pulleys are arranged side by side in the front-rear direction and abut against the top of the box beam.

[0007] In the prior art, the welding gun and the pressing plate are directly fixed on the support, so that the welding gun and the pressing plate cannot be closely attached to the box beam, and the welding gun and the pressing plate directly impact on the box beam, which may cause damage to the welding gun, the pressing plate or the box beam. Content of the utility model

[0008] In order to solve the foregoing problems, the utility model embodiment provides a welding assembly of a box beam, the support can be adaptively adjusted up and down, the welding gun and the pressing plate can be adaptively adjusted, the attachment of the welding gun and the pressing plate to the box beam is ensured and damage is avoided.

[0009] The utility model embodiment provides a welding assembly of a box beam, which comprises a support, a mounting seat 1 on the support, a welding gun 2, a recycling suction nozzle 4, a pressing plate 5, two vertical pulleys 6 and two horizontal pulleys 7, the recycling suction nozzle 4 is located directly behind the welding gun 2, the pressing plate 5 is arranged in the front-rear direction and abuts against the outside of the box beam 3, the two vertical pulleys 6 are arranged side by side in the front-rear direction, are vertically arranged and abut against the outside of the box beam 3, the two horizontal pulleys 7 are arranged side by side in the front-rear direction, are arranged in the left-right direction and abut against the top of the box beam 3, the support comprises a top plate 8 arranged in the front-rear direction, two side plates 9 arranged side by side in the front-rear direction on the lower side of the top plate 8, a fixing rod 10 arranged in the front-rear direction between the two side plates 9, an adjusting fixing part 11 on the fixing rod 10, a welding gun buffer structure 12 between one end of the fixing rod 10 and the corresponding side plate 9, a pressing plate buffer structure 13 between the outside of the pressing plate 5 and the side plate 9 and a vertical buffer structure 14 between the upper side of the top plate 8 and the mounting seat 1, the bottom of the side plate 9 is provided with a gap 15, the pressing plate 5 is located in the gap 15 and can move outward, the two vertical pulleys 6 are respectively arranged at the bottom of the two side plates 9 and are located on the outside of the gap 15, the two horizontal pulleys 7 are respectively arranged at the bottom of the two side plates 9 and are located on the inside of the gap 15, the fixing rod 10 is rotatably arranged on the side plate 9, the welding gun 2 is located between the two side plates 9 and is adjustably fixed on the fixing rod 10 through the adjusting fixing part 11, the recycling suction nozzle 4 is fixed on the top plate 8 or the side plate 9 on the rear side through a support frame 16, the welding gun buffer structure 12 comprises a swing arm 21 at the end of the fixing rod 10, two baffles 22 on the corresponding side plate 9 and located on both sides of the swing arm 21 and a first spring 23 between the swing arm 21 and the baffle 22 on the outside, the swing arm 21 abuts against the baffle 22 on the inside, the pressing plate buffer structure 13 comprises a rotating shaft 31 arranged in the vertical direction in the middle of the outside of the pressing plate 5, a horizontal arm 32 arranged in the left-right direction, a hinge seat 33 on one side plate 9 and a tension spring 34 on the other side plate 9, the horizontal arm 32 is located between the two side plates 9, is hingedly connected to the rotating shaft 31 and the pressing plate 5 at the middle part and is connected to the other end of the tension spring 34 at the outer end.

[0010] The vertical buffering structure 14 in the embodiment of the utility model comprises an upper sleeve 41, a limiting lug 43 outside the upper sleeve 41, a lifting column 42 inserted in the upper sleeve 41 and a second spring in the upper sleeve 41, the upper sleeve 41 and the lifting column 42 are vertically arranged and are respectively arranged on the lower side of the mounting base 1 and the upper side of the top plate 8, the lifting column 42 can move up and down in the upper sleeve 41, the limiting lug 43 is located directly above the welding gun 2 and a long circular hole is arranged on the upper side of the limiting lug 43 along the left and right directions; the welding gun 2 is located on the inner side of the top plate 8, the upper end of the welding gun 2 is slidably arranged in the long circular hole and can move up and down in the long circular hole; the second spring is vertically arranged and is arranged between the upper side of the lifting column 42 and the lower side of the mounting base 1.

[0011] Further, the lower part of the side plate 9 is inwardly bent to form a bent part, the welding gun buffering structure 12 is located on the upper part of the bent part, and the notch 15 is located on the bottom of the bent part.

[0012] Further, the notch 15 is a vertically arranged rectangular opening, a vertical fixing plate 17 is arranged on the side plate 9 and located on the inner side of the notch 15 along the vertical direction, a horizontal fixing plate 18 is arranged on the bottom of the side plate 9 and located on the outer side of the notch 8 along the front and back directions, the vertical fixing plate 17 and the horizontal fixing plate 18 are located on the side of the side plate 9 away from the welding gun 2, the vertical fixing plate 17 is located above the inner side corresponding to the horizontal fixing plate 18, the transverse pulley 7 is arranged on the inner side corresponding to the vertical fixing plate 17, and the vertical pulley 6 is arranged on the lower side corresponding to the horizontal fixing plate 18; the material pressing plate 5 is arranged close to the outer side of the notch 15.

[0013] Specifically, the swing arm 21 is located on the lower side of the fixing rod 10, is arranged obliquely inward from top to bottom, is fixed at the rear end of the fixing rod 10 at the upper end, is located adjacent to the rear side of the side plate 9 at the rear side, and abuts against the inner side of the baffle 22 at the lower end.

[0014] Specifically, the hinge seat 33 is arranged on the rear lower part of the side plate 9 at the front side and is located on the outer side of the notch 15; the inner end of the transverse arm 32 is connected with the upper end of the rotating shaft 31, the upper middle part is hingedly connected with the hinge seat 33 through a vertical pin shaft, and the outer end lower side is connected with the front end of the tension spring 34; the tension spring 34 is arranged along the front and back directions, and the rear end is connected with the lower part of the side plate 9 at the rear side.

[0015] Preferably, the outer side of the side plate 9 at the rear side is provided with a screw rod fixing plate 35 along the left and right directions, the screw rod fixing plate 35 is provided with a screw rod 36 capable of being adjusted forward and backward, the screw rod 36 is arranged along the front and back directions and is provided with a tension spring mounting seat 37 at the front end, and the rear end of the tension spring 34 is fixed on the tension spring mounting seat 37.

[0016] The utility model discloses a welding assembly of box girder, and the welding assembly comprises a support frame, a welding torch, a pressing plate and a recovery suction nozzle.

[0017] Preferably, the side plate 9 is provided with a through hole 19, and the wire is led out from the through hole on the side plate 9 on the front side.

[0018] The support frame 16 comprises a hard support frame and a soft support frame, the upper portion of the pressing plate 5 is outwardly bent to avoid position; the hard support frame and the soft support frame are arranged along the front-rear direction, the front end of the hard support frame is fixed on the top plate 8, and the rear end of the hard support frame is provided with a ring sleeve in the vertical direction; the recovery suction nozzle 4 is fixed in the ring sleeve, and the lower end of the recovery suction nozzle 4 is located on the adjacent inner side of the front end of the pressing plate 5; the soft support frame is a steel wire structure, the front end of the soft support frame is hooked in the through hole 19 of the side plate 9 on the rear side, and the rear end of the soft support frame is fixedly connected with the lower portion of the recovery suction nozzle 4.

[0019] The utility model discloses a welding assembly of box girder, and the welding assembly comprises a support frame, a welding torch, a pressing plate and a recovery suction nozzle. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 Fig. 1 is a structural schematic view of the welding assembly of box girder in the utility model embodiment;

[0021] Figure 2 Fig. 2 is a partial enlarged view of the welding assembly of box girder in the utility model embodiment; Figure 1

[0022] Figure 3 Fig. 4 is a structural schematic view of the pressing plate buffer structure in the utility model embodiment;

[0023] Figure 4 Fig. 5 is a structural schematic view of the combination of the side plate and the welding torch buffer structure in the utility model embodiment.

[0024] ​In the figure: 1 mounting seat, 2 welding gun, 3 box beam, 4 recycling suction nozzle, 5 pressing plate, 6 vertical pulley, 7 horizontal pulley, 8 top plate, 9 side plate, 10 fixed rod, 11 adjustment fixing, 12 welding gun buffer structure, 13 pressing plate buffer structure, 14 vertical buffer structure, 15 notch, 16 support frame, 17 vertical fixed plate, 18 horizontal fixed plate, 19 through hole;

[0025] 21 swing arm, 22 baffle, 23 first spring;

[0026] 31 rotating shaft, 32 horizontal arm, 33 hinged seat, 34 tension spring, 35 screw fixed plate, 36 screw, 37 tension spring mounting seat;

[0027] 41 upper sleeve, 42 lifting column, 43 limiting lug. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model will be described further in detail below in combination with the drawings.

[0029] Example 1

[0030] Referring to Figures 1-4 , example 1 provides a welding assembly of a box beam, which comprises a support and a mounting seat 1, a welding gun 2, a recycling suction nozzle 4, a pressing plate 5, two vertical pulleys 6 and two horizontal pulleys 7 and the like on the support. The recycling suction nozzle 4 is used for recycling welding flux, is located right behind the welding gun 2, is fixed on the rear side of the support, is located adjacent to the upper side of the box beam 3 and is connected with an upper hopper through a pipeline.

[0031] The support frame comprises a top plate 8, two side plates 9, a fixing rod 10, an adjusting fixing part 11, a welding gun buffer structure 12, a pressing plate buffer structure 13 and a vertical buffer structure 14. The top plate 8 is arranged in the front-rear direction. The two side plates 9 are arranged side by side in the front-rear direction and vertically, and are respectively located at the lower front end and the lower rear end of the top plate 8. The lower part of each side plate 9 is inwardly bent to form a bent part. A through hole 19 is arranged on the upper part of each side plate 9 to reduce the weight and wiring. A notch 15 is arranged on the bottom of each side plate 9. The fixing rod 10 is arranged in the front-rear direction and is located between the two side plates 9. The fixing rod 10 is rotatably arranged on the side plates 9. One end (specifically, the rear end) of the fixing rod 10 extends relative to the corresponding side plate 9 (is fixedly connected with the swing arm 21). The fixing rod 10 is specifically a round rod. The welding gun 2 is located between the two side plates 9 and is adjustably (up-down adjustment) fixed on the fixing rod 10 through the adjusting fixing part 11. The recovery suction nozzle 4 is fixed on the top plate 8 or the rear side plate 9 through the support frame 16. The pressing plate 5 is arranged in the front-rear direction and abuts against the outer side of the box beam 3. The pressing plate 5 is located in the notch 15 and can move outward. The pressing plate 5 is arranged close to the outer side of the notch 15. The two vertical pulleys 6 are arranged side by side in the front-rear direction and vertically. The two vertical pulleys 6 abut against the outer side of the box beam 3 and are respectively arranged at the bottom of the two side plates 9 and located on the outer side of the notch 15. The two horizontal pulleys 7 are arranged side by side in the front-rear direction and horizontally. The two horizontal pulleys 7 abut against the top of the box beam 3 and are respectively arranged at the bottom of the two side plates 9 and located on the inner side of the notch 15.

[0032] The vertical buffer structure 14 is arranged between the upper side of the top plate 8 and the mounting seat 1 and is vertically arranged. The vertical buffer structure 14 allows the top plate 8 to elastically move in the vertical direction.

[0033] The welding gun buffer structure 12 is arranged between one end (the front end or the rear end) of the fixing rod 10 and the corresponding side plate 9 and is specifically arranged on the upper part of the bent part. The welding gun buffer structure 12 comprises a swing arm 21 at the end of the fixing rod 10, two baffles 22 on the corresponding side plate 9 and located on both sides of the swing arm 21, and a first spring 23 between the swing arm 21 and the outer baffle 22. The swing arm 21 can swing between the two baffles 22 and abuts against the inner baffle 22. Specifically, the first spring 23 is perpendicular to the swing arm 21.

[0034] The pressing plate buffer structure 13 is arranged between the outer side of the pressing plate 5 and the side plate 9. The pressing plate buffer structure 13 comprises a rotating shaft 31 arranged in the middle of the outer side of the pressing plate 5 and vertically, a horizontal arm 32 arranged in the left-right direction, a hinge seat 33 on one side plate 9 (the front side plate 9 or the rear side plate 9), and a tension spring 34 on the other side plate 9 (the rear side plate 9 or the front side plate 9). The horizontal arm 32 is located between the two side plates 9, is hingedly connected to the rotating shaft 31 and the pressing plate 5 at the inner end and the outer end, and is hingedly connected to the hinge seat 33 at the middle.

[0035] Figure 1 ​The vertical buffering structure 14 in the embodiment of the utility model includes upper sleeve 41, limit ear 43 of upper sleeve 41 rear side, lifting column 42 inserted in upper sleeve 41 and second spring in upper sleeve 41 etc., and the flat key and the keyway that are mutually matched are arranged between upper sleeve 41 and lifting column 42 along the vertical direction to make lifting column 42 only can move vertically. Upper sleeve 41 and lifting column 42 are all vertically arranged and are respectively arranged at the downside of mounting seat 1 and the upside of top plate 8. Lifting column 42 can move up and down in upper sleeve 41, but cannot slide out from upper sleeve 41. Limit ear 43 is located directly above welding torch 2 and long circular hole is arranged on the left and right sides thereof. Welding torch 2 is located at the inner side of top plate 8, the upper end thereof is slidably arranged in long circular hole and can move up and down in long circular hole, and limit convex ring is arranged above and below limit ear 43. Second spring is vertically arranged and is arranged between the upside of lifting column 42 and the downside of mounting seat 1.

[0036] Further, referring to 1-2 and 4, the notch 15 in the embodiment of the utility model is a vertically arranged rectangular opening, and the inner side is shorter than the outer side. The vertical fixing plates 17 (four in total) are arranged on the inner side of the notch 15 along the vertical direction, and the horizontal fixing plates 18 (four in total) are arranged on the outer side of the notch 15 along the front-to-back direction. The vertical fixing plates 17 and the horizontal fixing plates 18 are located on the side of the side plate 9 away from the welding torch 2; specifically, for the front side plate 9, the vertical fixing plates 17 and the horizontal fixing plates 18 are located on the front side of the side plate 9; for the rear side plate 9, the vertical fixing plates 17 and the horizontal fixing plates 18 are located on the rear side of the side plate 9. The vertical fixing plates 17 are located above the inner side of the corresponding horizontal fixing plates 18, the horizontal pulley 7 is arranged on the inner side corresponding to the vertical fixing plate 17, and the vertical pulley 6 is arranged on the lower side corresponding to the horizontal fixing plate 18.

[0037] Referring to Figure 1 The adjusting fixing member 11 in the embodiment of the utility model includes a locking nut arranged along the left-right direction, a locking bolt (arranged along the left-right direction) on the outer side of the locking nut, a fixing sleeve on the upper side of the locking nut, and an adjusting sleeve on the inner side of the locking nut, etc. The fixing sleeve is sleeved and fixed on the middle part of the fixed rod 10 and simultaneously serves as a connection electrode connected with the wire (which passes out from the through hole on the front side plate 9), and the middle part of the welding torch 2 is inserted into the adjusting sleeve and locked by the locking bolt. The welding torch 2 can be adjusted up and down by loosening the locking bolt.

[0038] Referring to Figure 1The utility model discloses a support frame 16 including hard support frame and soft support frame, the upper portion of the material pressing plate 5 is bent outward to avoid the position. Hard support frame and soft support frame are all along the front and back setting, and the front end of hard support frame is fixed on the top plate 8 and the rear end is provided with a ring sleeve along the vertical direction. The recovery suction nozzle 4 is fixed in the ring sleeve, and the lower end is located on the adjacent inner side of the front end upper portion of the material pressing plate 5. The soft support frame is steel wire structure, the front end is hooked in the through hole 19 of the rear side side plate 9, and the rear end is fixedly connected with the lower portion of the recovery suction nozzle 4, and the recovery suction nozzle 4 can slightly swing.

[0039] Embodiment 2

[0040] Referring to Figure 1 and 4 Embodiment 2 provides a box girder welding assembly, which is basically same as the structure of embodiment 1, and the difference is that the swing arm 21 in the embodiment is located on the lower side of the fixed rod 10, is arranged obliquely inward from top to bottom, the upper end is fixed on the rear end of the fixed rod 10, is located adjacent to the rear side of the rear side side plate 9, and the lower end abuts against the inner side baffle 22. The baffle 22 is arranged obliquely inward from top to bottom. The first spring 23 is arranged obliquely inward from bottom to top.

[0041] Embodiment 3

[0042] Referring to Figures 1-3 Embodiment 3 provides a box girder welding assembly, which is basically same as the structure of embodiment 2, and the difference is that the hinge seat 33 in the embodiment is arranged on the rear side lower portion of the front side side plate 9 and is located on the outer side of the notch 15. The inner end of the transverse arm 32 is connected with the upper end of the rotating shaft 31, the upper side middle portion is hingedly connected with the hinge seat 33 through a vertical pin shaft, and the outer end lower side is connected with the front end of the tension spring 34. The outer side of the rear side side plate 9 is provided with a screw fixing plate 35 along the left and right direction, the screw fixing plate 35 is provided with a screw 36 capable of being adjusted forward and backward (locked by two nuts, and the screw 36 is arranged along the front and back direction and is provided with a tension spring mounting seat 37. The tension spring 34 is arranged along the front and back direction and the rear end is fixed on the tension spring mounting seat 37.

[0043] Embodiment 4

[0044] Referring to Figure 4 Embodiment 4 provides a box girder welding assembly, which is basically same as the structure of embodiment 1, and the difference is that two through holes 19 are arranged on the front and back of the side plate 9. The through hole 19 is a circular hole, and the wire is led out from the through hole on the upper portion of the front side side plate 9.

[0045] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A welding assembly for box girder, comprising a support and a mounting seat (1), a welding torch (2), a recovery nozzle (4), a pressure plate (5), two vertical pulleys (6) and two horizontal pulleys (7) arranged on the support, the recovery nozzle (4) is located right behind the welding torch (2), the pressure plate (5) is arranged along the front-rear direction and abuts against the outer side of the box girder (3), the two vertical pulleys (6) are arranged side by side along the front-rear direction and abut against the outer side of the box girder (3), and the two horizontal pulleys (7) are arranged side by side along the left-right direction and abut against the top of the box girder (3), characterized in that the support comprises a top plate (8) arranged along the front-rear direction, two side plates (9) arranged side by side along the front-rear direction below the top plate (8), a fixing rod (10) arranged between the two side plates (9) along the front-rear direction, an adjusting fixing member (11) arranged on the fixing rod (10), a welding torch buffer structure (12) between one end of the fixing rod (10) and the corresponding side plate (9), a pressure plate buffer structure (13) between the outer side of the pressure plate (5) and the side plate (9), and a vertical buffer structure (14) between the upper side of the top plate (8) and the mounting seat (1), the bottom of the side plate (9) is provided with a gap (15), the pressure plate (5) is located in the gap (15) and can move outward, the two vertical pulleys (6) are respectively arranged at the bottom of the two side plates (9) and located outside the gap (15), the two horizontal pulleys (7) are respectively arranged at the bottom of the two side plates (9) and located inside the gap (15), the fixing rod (10) is rotatably arranged on the side plate (9), the welding torch (2) is located between the two side plates (9) and adjustably fixed on the fixing rod (10) through the adjusting fixing member (11), and the recovery nozzle (4) is fixed on the top plate (8) or the rear side plate (9) through a support frame (16); the welding torch buffer structure (12) comprises a swing arm (21) at the end of the fixing rod (10), two baffles (22) on the corresponding side plate (9) and located on both sides of the swing arm (21), and a first spring (23) between the swing arm (21) and the outer baffle (22), and the swing arm (21) abuts against the inner baffle (22); the pressure plate buffer structure (13) comprises a rotating shaft (31) arranged vertically in the middle of the outer side of the pressure plate (5), a horizontal arm (32) arranged along the left-right direction, a hinge seat (33) on one side plate (9), and a tension spring (34) on the other side plate (9), the horizontal arm (32) is located between the two side plates (9), the middle part is hinged to the hinge seat (33), the inner end is hinged to the pressure plate (5) through the rotating shaft (31), and the outer end is connected to the other end of the tension spring (34). ​ 2. The welded assembly of box girders of claim 1, wherein, The vertical buffering structure (14) comprises an upper sleeve (41), a limiting lug (43) outside the upper sleeve (41), a lifting column (42) inserted into the upper sleeve (41) and a second spring in the upper sleeve (41), the upper sleeve (41) and the lifting column (42) are vertically arranged and are respectively arranged on the lower side of the mounting base (1) and the upper side of the top plate (8), the lifting column (42) can move up and down in the upper sleeve (41), the limiting lug (43) is located directly above the welding gun (2) and a long circular hole is arranged on the upper side of the limiting lug (43) along the left-right direction, the welding gun (2) is located on the inner side of the top plate (8), the upper end of the welding gun (2) is slidably arranged in the long circular hole and can move up and down in the long circular hole, and the second spring is vertically arranged and is arranged between the upper side of the lifting column (42) and the lower side of the mounting base (1).

3. The welded assembly of box beams of claim 1, wherein, The lower part of the side plate (9) is inwardly bent to form a bent part, the welding gun buffering structure (12) is located on the upper part of the bent part, and the notch (15) is located on the bottom of the bent part.

4. The welded assembly of box beams of claim 1, wherein, The notch (15) is a vertically arranged rectangular opening, a vertical fixing plate (17) is arranged on the side plate (9) and located on the inner side of the notch (15) along the vertical direction, a horizontal fixing plate (18) is arranged on the bottom of the side plate (9) and located on the outer side of the notch (15) along the front-rear direction, the vertical fixing plate (17) and the horizontal fixing plate (18) are located on the side of the side plate (9) away from the welding gun (2), the vertical fixing plate (17) is located above the inner side of the corresponding horizontal fixing plate (18), the transverse pulley (7) is arranged on the inner side corresponding to the vertical fixing plate (17), and the vertical pulley (6) is arranged on the lower side corresponding to the horizontal fixing plate (18); the material pressing plate (5) is arranged close to the outer side of the notch (15).

5. The welded assembly of box beams of claim 3, wherein, The swing arm (21) is located on the lower side of the fixing rod (10) and is arranged obliquely inward from top to bottom, the upper end of the swing arm (21) is fixed to the rear end of the fixing rod (10), the swing arm (21) is located adjacent to the rear side of the side plate (9) on the rear side, and the lower end of the swing arm (21) abuts against the inner side of the baffle (22).

6. The welded assembly of box beams of claim 1, wherein, The hinge seat (33) is arranged on the rear lower part of the side plate (9) on the front side and located on the outer side of the notch (15); the inner end of the transverse arm (32) is connected with the upper end of the rotating shaft (31), the upper side of the middle part of the transverse arm (32) is hingedly connected with the hinge seat (33) through a vertical pin shaft, and the outer end of the lower side of the transverse arm (32) is connected with the front end of the tension spring (34); the tension spring (34) is arranged along the front-rear direction, and the rear end of the tension spring (34) is connected with the lower part of the side plate (9) on the rear side.

7. The welded assembly of box beams of claim 6, wherein, The outer side of the side plate (9) on the rear side is provided with a screw rod fixing plate (35) along the left-right direction, the screw rod fixing plate (35) is provided with a screw rod (36) capable of being adjusted forward and backward, the screw rod (36) is arranged along the front-rear direction and is provided with a tension spring mounting seat (37) at the front end, and the rear end of the tension spring (34) is fixed to the tension spring mounting seat (37).

8. The welded assembly of box beams of claim 1, wherein, The adjusting fixing part (11) comprises locking nuts arranged along the left-right direction, locking bolts outside the locking nuts, fixing sleeves on the upper side of the locking nuts and adjusting sleeves on the inner side of the locking nuts, the fixing sleeves and the adjusting fixing part are arranged along the front-back direction and the vertical direction respectively, the fixing sleeves are sleeved and fixed on the middle part of the fixed rod (10) and simultaneously serve as connecting electrodes connected with the wires, the middle part of the welding gun (2) is inserted into the adjusting sleeves and locked by the locking bolts.

9. The welded assembly of box beams of claim 8, wherein, The side plate (9) is provided with a through hole (19), and the wire is led out from the through hole on the front side plate (9) to the front.

10. The welded assembly of box beams of claim 9, wherein, The supporting frame (16) comprises a hard supporting frame and a soft supporting frame, the upper part of the pressing plate (5) is outwardly bent to avoid position; the hard supporting frame and the soft supporting frame are arranged along the front-back direction, the front end of the hard supporting frame is fixed on the top plate (8) and the rear end is provided with a ring sleeve along the vertical direction; the recycling suction nozzle (4) is fixed in the ring sleeve and the lower end is located on the adjacent inner side of the front end upper part of the pressing plate (5); the soft supporting frame is a steel wire structure, the front end is hooked in the through hole (19) of the rear side plate (9) and the rear end is fixedly connected with the lower part of the recycling suction nozzle (4).

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