CN115430967B

CN115430967B - Welding device for bridge metal structural part

Info

Publication number: CN115430967B
Application number: CN202211394628.5A
Authority: CN
Inventors: 练文明; 徐一平; 夏红霞
Original assignee: Jiangsu Wumao Construction Group Co ltd
Current assignee: Jiangsu Wumao Construction Group Co ltd
Priority date: 2022-11-09
Filing date: 2022-11-09
Publication date: 2023-04-25
Anticipated expiration: 2042-11-09
Also published as: CN115430967A

Abstract

The invention provides a welding device for a bridge metal structural member, which relates to the technical field of bridge metal structural member welding and comprises a supporting component; the supporting component comprises a mounting box, a base, vertical plates and clamping plates, wherein a rectangular groove is formed in the mounting box, a clamping mechanism is connected in the rectangular groove in a sliding mode, the base is fixedly arranged at the left end of the mounting box, the top surface of the base is fixedly and vertically connected with two groups of vertical plates, the top surface of the base is fixedly connected with a lifting structure, when two groups of bridge metal structural parts to be welded are short, after the two groups of bridge metal structural parts to be welded are conveyed to the position of a welding machine wall through the cooperation of a roll shaft and a conveying wheel, the welding parts are fastened in a butt joint mode through the end face of the clamping block, the welding parts are fastened on the top surface in a matched butt joint mode, so that fastening work is completed, welding is conducted, the welding device is applicable to bridge metal structural parts to be welded with different lengths and different shapes, and the problem that welding of bridge metal structural parts to be welded with different lengths is difficult to achieve.

Description

Welding device for bridge metal structural part

Technical Field

The invention relates to the technical field of welding of bridge metal structural parts, in particular to a welding device for a bridge metal structural part.

Background

The bridge metal structural member is one of bridge members, and is mostly processed by I-shaped, round pipe type and other foundation members in different shapes through welding and other modes by utilizing a welding device, so that the metal structural member suitable for bridge lap joint or embedded part treatment is obtained.

For the traditional welding device for the bridge metal structural member, the welding fastening modes are different due to the fact that the shapes required by the bridge metal structural member are different, and the same welding device is difficult to weld the bridge metal structural member with different shapes such as a circular tube, an I-shaped structure and a rectangle with different lengths; the welding device is difficult to enable the welding mechanical arm to directly weld after the workpiece to be welded is fastened, so that the processing time is shortened; when two groups of round pipe structural members are welded, the problem that the circle center is difficult to align and the fastening can be completed exists.

Disclosure of Invention

In view of the above, the present invention provides a welding device for bridge metal structural members, which has a lifting structure and an inner diameter clamping member, and is suitable for welding bridge metal structural members with different lengths and shapes by fastening the to-be-welded member from the side surface and the top surface.

The invention provides a welding device for a bridge metal structural member, which particularly comprises a supporting component and an inner diameter clamping piece; the supporting component comprises a mounting box, a base, vertical plates and clamping plates, wherein a rectangular groove is formed in the mounting box, a clamping mechanism is slidably clamped in the rectangular groove, the base is fixedly arranged at the left end of the mounting box, the top surface of the base is fixedly and vertically connected with two groups of vertical plates, the top surface of the base is fixedly connected with a lifting structure, the front side and the rear side of the top surface of the base are fixedly connected with clamping pieces, the front side and the rear side of the left end surface of the left vertical plate are respectively fixedly connected with two groups of clamping plates, the top surface of the base and the outer side of the vertical plate are slidably clamped with conveying wheels, and the inner parts of the clamping plates are fixedly clamped with a butt assembly; the top fixed connection of internal diameter fastener is in the bottom of elevation structure, and the inside fixed mounting of internal diameter fastener has actuating mechanism.

Optionally, the inside of base, equidistant the arranging of two sets of risers have the roller, and the top surface of roller flushes with the top surface of base, and roller electric connection to external circuit controller, and the inside of cardboard is equipped with two sets of circular holes, and the position in circular hole corresponds with the position of clamping piece.

Optionally, clamping mechanism comprises controller, the connecting plate, mounting panel and gangbar, wherein controller fixed connection is at the top of installation box, the inside of controller is equipped with the PLC controller and circuit intercommunication is controlled the display screen to the outside, connecting plate slip joint is on the installation box, the connecting plate is controlled by controller electric drive, and be equipped with gyro wheel and draw-in groove on the connecting plate, the gyro wheel passes through axle movable mounting in the inside of connecting plate, the upper and lower both sides of draw-in groove, the roof of the inside slip joint installation box of draw-in groove, the mounting panel passes through screw rod fixed connection at the top surface of connecting plate, the top surface fixed mounting welding arm of mounting panel, the right-hand member face fixed welding gangbar of connecting plate, the right-hand member face fixed of gangbar is equipped with two sets of push rods.

Optionally, the butt subassembly is including supporting pole and sleeve pipe, and the left end fixed connection of supporting pole is at the right-hand member face of gangbar, and the inside at the sheathed tube of supporting pole slip joint, sleeve pipe fixed connection is in the inside circular hole of cardboard.

Optionally, the bottom rod of the conveying wheel is an electric control sliding rod and is electrically connected with an external circuit, and the top wheel of the conveying wheel penetrates through the vertical plate.

Optionally, the elevation structure comprises right angle plate, hydraulic stem, even board and support the piece, the bottom surface fixed connection hydraulic stem at right angle plate top, the inside of right angle plate is equipped with the groove, sliding joint internal diameter fastener in the groove, hydraulic stem and external circuit control circuit coupling, and the bottom fixed welding of hydraulic stem is even the board, even the board passes through the fixed joint of ring in the periphery of internal diameter fastener, the top bottom surface of right angle plate still is equipped with two sets of automatically controlled telescopic links, automatically controlled telescopic link links to each other with external circuit controller electrical property, and automatically controlled telescopic link's end supports the piece through pivot swing joint, it is the cambered surface structure to support the piece one side to be the planar structure another side.

Optionally, the internal diameter fastener is including flexible pipe, link, slide bar and fixture block, flexible pipe slip joint in the inslot of right-angle plate, and flexible pipe's outer wall fixed connection is in the intra-annular of link bottom, and flexible pipe links to each other with external circuit controller electrical property, and the left end face of link is fixed to be equipped with the slide, the inside slip joint slide bar of slide, and the inside of slide bar is equipped with tooth socket, the left end face fixed connection fixture block of slide bar, and the left end of fixture block is fan-shaped structure.

Optionally, the actuating mechanism comprises motor, worm wheel, and the motor is coupled with external circuit controller circuit, and motor fixed mounting is in the inside of flexible pipe, and motor coaxial coupling worm, worm meshing connection worm wheel, worm wheel pass through axle activity joint on the inner wall of flexible pipe, and worm wheel and the inside tooth socket internal engagement connection of slide bar.

Optionally, the clamping piece is including splint, fixed plate and lift push rod, and splint pass through spring clamp and axle swing joint fixed plate, and the bottom surface fixed connection of fixed plate is at the top surface of base, and the top of the terminal butt lift push rod of splint, lift push rod and external circuit controller electrical property link to each other.

Advantageous effects

1. Compared with the traditional welding device, when two groups of bridge metal structural members to be welded are shorter, after the members to be welded are conveyed to the welding mechanical arm through the cooperation of the roller shafts and the conveying wheels, the welding device is abutted and fastened by the end faces of the clamping blocks, and the members to be welded are fastened on the top face through the cooperation of the abutting blocks, so that fastening work is completed, welding is performed, and the welding device is suitable for bridge metal structural members to be welded with different lengths.

2. When two sets of bridge metal structures to be welded are rectangular structures, the conveying wheels slide towards the middle through the roller shafts, the conveying wheels are driven to push the outer walls of the structures after contacting, the bridge metal structures to be welded are conveyed to the positions of the welding mechanical arms through the matched roller shafts, the lifting pushing rods are started to jack up the clamping plates, the clamping plates rotate by a certain angle and then are matched with the supporting rods, one sides of the bridge metal structures to be welded are clamped onto the vertical plates through the clamping plates, the controller drives the mounting plates and the welding mechanical arms to synchronously move after moving through the circuit control connecting plates, the linkage rods are driven to move, the pushing rods at the front ends of the linkage rods are abutted to the outer walls of the bridge metal structures to be welded, the two sets of to-be-welded parts are fastened, the welding mechanical arms are utilized to finish welding, and the welding processing time is shortened.

3. When two groups of bridge metal structural members to be welded are of a circular structure, the to-be-welded pieces are conveyed to the welding mechanical arm from two sides by utilizing the roller shafts, the inner diameter clamping pieces are driven to move downwards through the connecting plates after the driving hydraulic rods move downwards, meanwhile, the electric control telescopic rods are started to drive the abutting blocks to move downwards, the driving rotating shafts drive the abutting blocks to rotate for half a circle, the cambered surface structures of the abutting blocks face downwards to abut against the top surfaces of the structural members, the worm is coaxially driven to rotate after the motor is started, the worm drives four groups of worm gears to synchronously rotate through meshing and the rotation angles are consistent, the worm gears are meshed with tooth grooves to drive the sliding rods to move, the sliding rods move and then drive the clamping blocks to move, so that the outer diameter of the clamping blocks is enlarged, the clamping blocks abut against the inner walls of the two groups of the circular structural members to be welded, the inner diameter clamping pieces are matched to abut against the two groups of the circular structural members to be welded in a butt joint mode, and the telescopic tubes drive the clamping blocks to move to align the inner walls of the two groups of the structural members to be welded, so that welding dislocation is avoided, after half welding is completed, the welding pieces are rotated by utilizing the roller shafts to abut against the other half of the structural members, and finally welding work of the bridge metal structural members is completed.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings of the embodiments will be briefly described below.

The drawings described below are only for illustration of some embodiments of the invention and are not intended to limit the invention.

In the drawings:

FIG. 1 shows a schematic view of the right front side structure of a support assembly according to the present invention;

FIG. 2 illustrates a schematic view of the left rear side view of FIG. 1 in accordance with the present invention;

fig. 3 shows a schematic structural view of a clamping element according to the invention;

fig. 4 shows a schematic structural view of a lifting structure according to the invention;

FIG. 5 shows a schematic view of an expanded configuration of an inside diameter clip according to the present invention;

FIG. 6 shows a schematic diagram of the structure of the left side view of FIG. 5 in accordance with the present invention;

FIG. 7 shows a schematic structural view of a clamping mechanism according to the present invention;

FIG. 8 shows a schematic view of an expanded configuration of the clamping mechanism according to the present invention;

FIG. 9 is an enlarged schematic view of the structure of FIG. 5A according to the present invention;

fig. 10 shows an enlarged schematic view of the structure at B in fig. 6 according to the present invention.

List of reference numerals

11. A mounting box; 12. a base; 13. a vertical plate; 14. a clamping plate; 2. a clamping mechanism; 21. a controller; 22. a connecting plate; 2201. a roller; 2202. a clamping groove; 23. a mounting plate; 2301. welding a mechanical arm; 24. a linkage rod; 3. an abutment assembly; 31. a supporting rod; 32. a sleeve; 4. a transfer wheel; 5. a lifting structure; 51. a right angle plate; 52. a hydraulic rod; 53. a connecting plate; 54. abutting blocks; 6. an inner diameter clip; 61. a telescopic tube; 62. a connecting frame; 6201. a slideway; 63. a slide bar; 64. a clamping block; 7. a driving mechanism; 71. a motor; 72. a worm; 73. a worm wheel; 8. a clamping member; 81. a clamping plate; 82. a fixing plate; 83. and lifting the push rod.

Detailed Description

In order to make the objects, aspects and advantages of the technical solution of the present invention more clear, the technical solution of the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiment of the present invention. Unless otherwise indicated, terms used herein have the meaning common in the art. Like reference numerals in the drawings denote like parts.

Examples: please refer to fig. 1 to 10:

the invention provides a welding device for a bridge metal structural member, which comprises a supporting component and an inner diameter clamping piece 6; the supporting component comprises an installation box 11, a base 12, vertical plates 13 and clamping plates 14, wherein a rectangular groove is formed in the installation box 11, a clamping mechanism 2 is slidably clamped in the rectangular groove, the base 12 is fixedly arranged at the left end of the installation box 11, two groups of vertical plates 13 are fixedly and vertically connected to the top surface of the base 12, the lifting structure 5 is fixedly connected to the top surface of the base 12, clamping pieces 8 are fixedly connected to the front side and the rear side of the top surface of the base 12, two groups of clamping plates 14 are respectively fixedly connected to the front side and the rear side of the left end surface of the left vertical plate 13, a conveying wheel 4 is slidably clamped on the top surface of the base 12 and the outer side of the vertical plate 13, and a butt assembly 3 is fixedly clamped in the clamping plates 14; the top fixed connection of internal diameter fastener 6 is in the bottom of elevation structure 5, and the inside fixed mounting of internal diameter fastener 6 has actuating mechanism 7.

In addition, as shown in fig. 1 and fig. 3, the abutting component 3 includes an abutting rod 31 and a sleeve 32, the left end of the abutting rod 31 is fixedly connected to the right end face of the linkage rod 24, the abutting rod 31 is slidably clamped in the sleeve 32, the sleeve 32 is fixedly connected in a circular hole in the clamping plate 14, and the abutting rod 31 is driven to synchronously move after the linkage rod 24 moves, so that two groups of structural members are fixedly abutted before welding of the longer bridge metal structural members to be welded, and preparation for welding is made.

In addition, as shown in fig. 2 and fig. 3, the lifting structure 5 is composed of a rectangular plate 51, a hydraulic rod 52, a connecting plate 53 and a supporting block 54, the bottom surface of the top of the rectangular plate 51 is fixedly connected with the hydraulic rod 52, a groove is formed in the rectangular plate 51, the inner diameter clamping piece 6 is in sliding connection in the groove, the hydraulic rod 52 is coupled with an external circuit control circuit, the bottom end of the hydraulic rod 52 is fixedly welded with the connecting plate 53, the connecting plate 53 is fixedly clamped on the periphery of the inner diameter clamping piece 6 through a ring, two groups of electric control telescopic rods are further arranged on the bottom surface of the top of the rectangular plate 51, the electric control telescopic rods are electrically connected with an external circuit controller, the tail ends of the electric control telescopic rods are movably connected with the supporting block 54 through a rotating shaft, one surface of the supporting block 54 is of a plane structure, the other surface of the supporting block 54 is of an arc structure, the electric control telescopic rod is started to drive the inner diameter clamping piece 6 to move downwards after the hydraulic rod 52 is driven to move downwards through the connecting plate 53, the electric control telescopic rod is started to drive the supporting block 54 to move downwards, when a bridge metal structure to be welded is of a circular or arc structure, the rotating half circle is driven by the rotating the supporting block 54, the arc structure is enabled to be downward to be abutted against the top surface of the structure, and the bridge metal structure to be welded, and the bridge structure to be welded or flat top and the flat top and can be fastened.

In addition, as shown in fig. 3, the clamping member 8 includes a clamping plate 81, a fixing plate 82 and a lifting push rod 83, the clamping plate 81 is movably connected with the fixing plate 82 through a spring clamp and a shaft, the bottom surface of the fixing plate 82 is fixedly connected with the top surface of the base 12, the tail end of the clamping plate 81 is abutted against the top end of the lifting push rod 83, the lifting push rod 83 is electrically connected with an external circuit controller, after the lifting push rod 83 is started, the clamping plate 81 is jacked up, the clamping plate 81 is made to rotate by a certain angle and then is matched with the supporting rod 31, one side of a bridge metal structural member to be welded is clamped onto the vertical plate 13 by the clamping plate 81, so that the fixing of the member to be welded is completed, and after the two groups of clamping members 8 are fastened, the butt joints of the two groups of members to be welded are welded by using the welding mechanical arm 2301.

In addition, as shown in fig. 6, the inner diameter clamping piece 6 includes a telescopic tube 61, a connecting frame 62, a sliding rod 63 and a clamping block 64, the telescopic tube 61 is slidably clamped in a groove of the rectangular plate 51, an outer wall of the telescopic tube 61 is fixedly connected in a ring at the bottom end of the connecting plate 53, the telescopic tube 61 is electrically connected with an external circuit controller, a slide way 6201 is fixedly arranged on the left end face of the connecting frame 62, the sliding rod 63 is slidably clamped in the slide way 6201, a tooth groove is arranged in the slide rod 63, the clamping block 64 is fixedly connected to the left end face of the sliding rod 63, the left end of the clamping block 64 is in a fan-shaped structure, after the driving mechanism 7 drives the sliding rod 63 to move, the clamping block 64 is driven to move, so that the outer diameter of the clamping block 64 is enlarged, the clamping block 64 abuts against inner walls of two groups of round structural members to be welded, the abutting blocks 54 are matched to complete fastening, after half welding is completed, the other half of the round structural members to be welded is rotated by a roll shaft, the other half of the round structural members to be welded, the inner diameter clamping piece 6 is in a manner of abutting against the inner walls to be fastened.

In addition, as shown in fig. 7, the bottom rod of the conveying wheel 4 is an electric control sliding rod and is electrically connected with an external circuit, and the top wheel of the conveying wheel 4 penetrates through the vertical plates 13, when two groups of bridge metal structural members to be welded are conveyed to the top surfaces of the two groups of vertical plates 13 through the roller shafts, the conveying wheel 4 slides towards the middle through electric driving, and is contacted with the outer wall of the structural members to drive the top wheel, so that the conveying of the structural members is carried out through the cooperation roller shafts, the two groups of structural members to be welded are in a butt buckling state during conveying, and subsequent fastening is facilitated.

In addition, as shown in fig. 10, the driving mechanism 7 is composed of a motor 71, a worm 72 and a worm wheel 73, the motor 71 is coupled with an external circuit controller circuit, the motor 71 is fixedly installed inside the telescopic tube 61, the motor 71 is coaxially connected with the worm 72, the worm 72 is in meshed connection with the worm wheel 73, the worm wheel 73 is movably clamped on the inner wall of the telescopic tube 61 through a shaft, the worm wheel 73 is in meshed connection with a tooth socket inside the sliding rod 63, when the motor 71 is started, the worm 72 coaxially drives the worm 72 to rotate, the worm wheel 72 drives the four groups of worm wheels 73 to synchronously rotate through meshing and the rotation angles are consistent, and the worm wheel 73 drives the sliding rod 63 to move through meshing with the tooth socket, so that driving output of the inner diameter clamping piece 6 is completed.

In addition, as shown in fig. 7 and 8, the clamping mechanism 2 is composed of a controller 21, a connecting plate 22, a mounting plate 23 and a linkage rod 24, wherein the controller 21 is fixedly connected to the top of the mounting box 11, a PLC controller is arranged in the controller 21 and is in circuit communication with an external control display screen, the connecting plate 22 is slidably clamped on the mounting box 11, the connecting plate 22 is electrically driven and controlled by the controller 21, a roller 2201 and a clamping groove 2202 are arranged on the connecting plate 22, the roller 2201 is movably mounted in the connecting plate 22 through a shaft, the upper side and the lower side of the clamping groove 2202, the inside of the clamping groove 2202 is slidably clamped with the top plate of the mounting box 11, the mounting plate 23 is fixedly connected to the top surface of the connecting plate 22 through a screw rod, a welding mechanical arm 2301 is fixedly mounted on the top surface of the mounting plate 23, the right end surface of the connecting plate 22 is fixedly provided with two groups of push rods, after the controller 21 moves through the circuit control connecting plate 22, the mounting plate 23 and the welding mechanical arm 2301 are driven to move synchronously, so that the push rods at the front end of the connecting plate 24 abut against the outer wall of a metal structural member to be welded, and the roller 2201 is further fixed, and the top plate is further moved by the top plate 22011, and the top plate is further moved by the friction between the top plate and the bridge structural member to be welded.

In addition, as shown in fig. 1 and fig. 2, the roller shafts are arranged in the base 12 and between the two sets of vertical plates 13 at equal intervals, the top surface of the roller shaft is flush with the top surface of the base 12, the roller shafts are electrically connected to an external circuit controller, two sets of circular holes are formed in the clamping plate 14, the positions of the circular holes correspond to the positions of the clamping pieces 8, the bridge metal structural parts to be welded on the top surface of the clamping pieces can be transmitted by using the roller shafts, the longer bridge metal structural parts can be transmitted from one end of the base 12 to the other end, the shorter two sets of bridge metal structural parts to be welded can be transmitted from two ends of the base 12, the welding assembly 3 is transmitted from any one end after being welded into a whole, and the circular Kong Nabu clamping connection on the clamping plate 14 can be matched with the clamping pieces 8 to fasten the longer bridge metal structural parts to be welded, so that the welding is convenient.

Specific use and action of the embodiment: in the invention, when two groups of bridge metal structural members to be welded are in a rectangular structure, the two groups of bridge metal structural members are transmitted to the top surfaces of two groups of vertical plates 13 through roller shafts, the transmission wheel 4 slides towards the middle through electric drive, the top wheel is driven after the transmission wheel contacts the outer wall of the structural member, the bridge metal structural members to be welded are transmitted to the position of a welding mechanical arm 2301 from the matched roller shafts, the lifting push rod 83 is started, the clamping plate 81 is jacked up, the clamping plate 81 is enabled to rotate for a certain angle and then is matched with the supporting rod 31, the clamping plate 81 clamps one side of the bridge metal structural members to be welded to the vertical plates 13, after the controller 21 moves through a circuit control connecting plate 22, the mounting plate 23 and the welding mechanical arm 2301 are driven to synchronously move, and the linkage rod 24 is driven to move, so that the push rod at the front end of the linkage rod 24 is propped against the outer wall of the bridge metal structural members to be welded, and the two groups of bridge metal structural members to be welded are fastened.

Embodiment two:

when two groups of bridge metal structural members to be welded are of a circular structure, the members to be welded are conveyed to the welding mechanical arm 2301 from two sides by utilizing a roll shaft, the inner diameter clamping member 6 is driven to move downwards by the connecting plate 53 after the hydraulic rod 52 is driven to move downwards, meanwhile, the electric control telescopic rod is started to drive the abutting block 54 to move downwards, the driving rotating shaft drives the abutting block 54 to rotate for half a circle, the cambered surface structure of the abutting block 54 faces downwards so as to abut against the top surface of the structural members, the worm 72 is coaxially driven to rotate after the motor 71 is started, the worm 72 drives the four groups of worm gears 73 to synchronously rotate by meshing and the rotation angles are consistent, the worm gears 73 drive the slide bars 63 to move by meshing with tooth grooves, the slide bars 63 drive the clamping blocks 64 to move, so that the outer diameter of the clamping blocks 64 is enlarged, the clamping blocks 64 abut against the inner walls of the two groups of the circular structural members to be welded, the clamping blocks 54 are matched to complete fastening, when half of the welding is completed, the other half of the members to be welded are welded by rotating, the inner diameter clamping member 6 abuts against the inner walls, the two groups of members to be welded fastening tightly, and the telescopic pipe 61 drives the clamping blocks 64 to move, and the inner walls of the two groups of the bridge structural members to be welded can be aligned when the inner walls of the two groups of the bridge structural members are prevented from being dislocated, so that the welding of the bridge structural members to be welded, and the metal structural members to be welded.

The foregoing is merely exemplary embodiments of the present invention and is not intended to limit the scope of the invention, which is defined by the appended claims.

Claims

1. A welding device for bridge metal structural members, characterized by comprising a supporting component (1) and an inner diameter clamping piece (6); the supporting assembly (1) comprises a mounting box (11), a base (12), vertical plates (13) and clamping plates (14), wherein a rectangular groove is formed in the mounting box (11), a clamping mechanism (2) is slidably clamped in the rectangular groove, the base (12) is fixedly arranged at the left end of the mounting box (11), the top surface of the base (12) is fixedly and vertically connected with two groups of vertical plates (13), the top surface of the base (12) is fixedly connected with a lifting structure (5), clamping pieces (8) are fixedly connected to the front side and the rear side of the top surface of the base (12), two groups of clamping plates (14) are fixedly connected to the front side and the rear side of the left end surface of the left side vertical plate (13), a conveying wheel (4) is slidably clamped in the top surface of the base (12) and the outer side of the vertical plate (13), and a butt assembly (3) is fixedly clamped in the clamping plates (14); the clamping mechanism (2) consists of a controller (21), a connecting plate (22), a mounting plate (23) and a linkage rod (24), wherein the controller (21) is fixedly connected to the top of the mounting box (11), a PLC (programmable logic controller) is arranged in the controller (21) and is communicated with an external control display screen in a circuit mode, the connecting plate (22) is slidably clamped on the mounting box (11), the connecting plate (22) is electrically driven and controlled by the controller (21), a roller (2201) and a clamping groove (2202) are arranged on the connecting plate (22), the roller (2201) is movably mounted in the connecting plate (22) through a shaft and on the upper side and the lower side of the clamping groove (2202), the inside of the clamping groove (2202) is slidably clamped with the top plate of the mounting box (11), the mounting plate (23) is fixedly connected to the top surface of the connecting plate (22) through a screw rod, the top surface of the mounting plate (23) is fixedly provided with a welding mechanical arm (2301), the right end surface of the connecting plate (22) is fixedly welded with the linkage rod (24), and the right end surface of the linkage rod (24) is fixedly provided with two groups of push rods; the lifting structure (5) consists of a right angle plate (51), a hydraulic rod (52), a connecting plate (53) and a supporting block (54), wherein the bottom surface of the top of the right angle plate (51) is fixedly connected with the hydraulic rod (52), a groove is formed in the right angle plate (51), an inner diameter clamping piece (6) is in sliding connection in the groove, the hydraulic rod (52) is coupled with an external circuit control circuit, the bottom end of the hydraulic rod (52) is fixedly welded with the connecting plate (53), the connecting plate (53) is fixedly clamped on the periphery of the inner diameter clamping piece (6) through a ring, two groups of electric control telescopic rods are further arranged on the bottom surface of the top of the right angle plate (51), the electric control telescopic rods are electrically connected with an external circuit controller through a rotating shaft, the tail ends of the electric control telescopic rods are movably connected with the supporting block (54), and one surface of the supporting block (54) is of a plane structure, and the other surface of the supporting block is of a cambered surface structure; the top fixed connection of internal diameter fastener (6) is in the bottom of elevation structure (5), the inside fixed mounting of internal diameter fastener (6) has actuating mechanism (7), internal diameter fastener (6) is including flexible pipe (61), link (62), slide bar (63) and fixture block (64), flexible pipe (61) slip joint is in the inslot of right-angle board (51), the outer wall fixed connection of flexible pipe (61) is in the intra-annular of link (53) bottom, and flexible pipe (61) link to each other with external circuit controller electrical property, the left end face of link (62) is fixed to be equipped with slide (6201), the inside slip joint slide bar (63) of slide (6201), the inside of slide bar (63) is equipped with tooth socket, the left end face fixed connection fixture block (64) of slide bar (63), the left end of fixture block (64) is fan-shaped structure.

2. A welding apparatus for bridge metal structures as defined in claim 1 wherein: the inside of base (12), equidistant the arranging of two sets of risers (13) have the roller, and the top surface of roller flushes with the top surface of base (12), and roller electric connection to outside circuit controller, and the inside of cardboard (14) is equipped with two sets of circular holes, and the position in circular hole corresponds with the position of clamping piece (8).

3. A welding apparatus for bridge metal structures as defined in claim 2 wherein: the abutting assembly (3) comprises an abutting rod (31) and a sleeve (32), the left end of the abutting rod (31) is fixedly connected to the right end face of the linkage rod (24), the abutting rod (31) is slidably clamped inside the sleeve (32), and the sleeve (32) is fixedly connected in a circular hole inside the clamping plate (14).

4. A welding apparatus for bridge metal structures as defined in claim 2 wherein: the bottom rod of the conveying wheel (4) is an electric control sliding rod and is electrically connected with an external circuit, and the top wheel of the conveying wheel (4) penetrates through the vertical plate (13).

5. A welding apparatus for bridge metal structures as defined in claim 1 wherein: the driving mechanism (7) is composed of a motor (71), a worm (72) and a worm wheel (73), the motor (71) is in circuit coupling with an external circuit controller, the motor (71) is fixedly arranged inside the telescopic tube (61), the motor (71) is coaxially connected with the worm (72), the worm (72) is in meshed connection with the worm wheel (73), the worm wheel (73) is movably clamped on the inner wall of the telescopic tube (61) through a shaft, and the worm wheel (73) is in meshed connection with a tooth socket inside the sliding rod (63).

6. A welding apparatus for bridge metal structures as defined in claim 2 wherein: the clamping piece (8) comprises a clamping plate (81), a fixing plate (82) and a lifting push rod (83), wherein the clamping plate (81) is movably connected with the fixing plate (82) through a spring clamp and a shaft, the bottom surface of the fixing plate (82) is fixedly connected with the top surface of the base (12), and the tail end of the clamping plate (81) is abutted

The top end of the lifting push rod (83), and the lifting push rod (83) is electrically connected with an external circuit controller.