Welding device and process for steel box girder of viaduct

Abstract

The application relates to a welding device and process for a steel box girder of a viaduct, and relates to the technical field of welding devices, which comprises a welding frame, the welding frame comprises a support plate, both sides of the length direction of the support plate are provided with support tables, the welding frame further comprises a sliding frame, the sliding frame is horizontally slidably connected to the two support tables, a welding assembly for welding rib plates and mounting plates is movably connected to the sliding frame, and a cleaning assembly for cleaning the junctions of the rib plates and the mounting plates is movably connected to the sliding frame. The mounting plate is placed on the upper end surface of the support plate, the rib plates are placed at equal intervals on the upper end of the mounting plate, the rib plates are pressed on the mounting plate, the sliding frame can be moved, the cleaning assembly first cleans the junctions of the rib plates and the mounting plates to be welded, the welding assembly welds the cleaned junctions of the rib plates and the mounting plates, impurities are less when the rib plates and the mounting plates are welded, the welding effect is better, and the welding stability between the rib plates and the mounting plates is higher.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of welding device, in particular to a steel box girder welding device and process for viaduct. BACKGROUND

[0002] The steel box girder rib plate is a supporting structure inside the steel box girder, which can increase the stiffness of the steel box girder and better maintain the stability of its shape and size under external force.

[0003] The steel beam box includes a mounting plate, and the rib plate is usually welded to the mounting plate by welding when mounted on the mounting plate. The welding method can provide sufficient strength and stability to meet the mechanical performance requirements of the mounting plate during use.

[0004] During the welding of the rib plate and the mounting plate, it is difficult to avoid the splashing of welding slag. The splashed welding slag may fall on the junction of the rib plate and the mounting plate. Subsequently, when welding the rib plate and the mounting plate, the welding slag may cause incomplete welding or incomplete penetration of the welding joint, thereby affecting the safety and reliability of the welded structure and the supporting effect of the rib plate on the mounting plate. SUMMARY

[0005] In order to improve the welding stability between the rib plate and the mounting plate, the present application provides a steel box girder welding device and process for viaduct.

[0006] In a first aspect, the present application provides a steel box girder welding device for viaduct, which adopts the following technical solution:

[0007] A steel box girder welding device for viaduct, comprising a welding frame, the welding frame comprising a support plate, both sides of the support plate in the length direction are provided with support tables, the welding frame further comprises a sliding frame, the sliding frame is horizontally slidably connected to the two support tables, the sliding frame is movably connected with a welding assembly for welding the rib plate and the mounting plate, and the sliding frame is movably connected with a cleaning assembly for cleaning the junction of the rib plate and the mounting plate.

[0008] By adopting the above technical solution, the mounting plate is placed on the upper end surface of the support plate, the rib plates are placed at equal intervals on the upper end of the mounting plate, and the rib plates are pressed onto the mounting plate. The sliding frame can be moved, the cleaning assembly first cleans the junction of the rib plate and the mounting plate to be welded, and the welding gun welds the junction of the cleaned rib plate and the mounting plate. When welding the rib plate and the mounting plate, there are fewer impurities, the welding effect is better, and the welding stability between the rib plate and the mounting plate is higher.

[0009] Optionally, the sliding frame is horizontally slidably connected with a driving cylinder, a driving motor is arranged on a piston rod of the driving cylinder, the welding assembly comprises a support frame, a connecting rod and a welding gun, the support frame is arranged above the connecting rod, the welding gun is arranged at a lower end of the connecting rod, an output shaft of the driving motor is fixedly connected with an upper end of the support frame, and the connecting rod is fixed to the support frame.

[0010] By adopting the above technical scheme, the driving motor and the welding gun can be driven to adjust the height direction by operating the output shaft of the driving cylinder, and then the height of the welding gun is adjusted; the orientation of the welding gun head can be adjusted by operating the output shaft of the driving motor, and the structure is simple and convenient to adjust.

[0011] Optionally, the driving cylinder is fixedly connected with a support block on a side away from the sliding frame, the cleaning assembly comprises a support column, the support column is rotatably connected to a lower end of the support block, a plurality of sliding blocks are vertically slidably connected to the support column, two support rods are arranged at a lower end of each sliding block, and a cleaning rod is arranged at a lower end of each support rod.

[0012] By adopting the above technical scheme, after welding of one of the rib plates is completed by the welding gun, the driving cylinder is operated to slide on the sliding frame, the support block is driven to slide in the process of sliding of the driving cylinder, the support column is operated to rotate when the sliding block slides to a next position to be cleaned, the positions of the sliding blocks are adjusted, the unused cleaning rod is directed to a position opposite to the driving motor, the sliding frame is moved, the unused cleaning rod is used to clean the junction between the rib plate and the mounting plate to be welded, and the cleaning effect of the junction between the rib plate and the mounting plate to be welded is improved, the welding gun is used to weld the cleaned junction between the rib plate and the mounting plate, impurities are less when the rib plate and the mounting plate are welded, the welding effect is better, and the welding stability between the rib plate and the mounting plate is higher.

[0013] Optionally, the two cleaning rods on the same sliding block are inclined away from each other.

[0014] By adopting the above technical scheme, the positions of the two cleaning rods are respectively directed to the positions of the junctions between the adjacent two rib plates and the mounting plate, and the cleaning effect of the junctions between the rib plate and the mounting plate is improved.

[0015] Optionally, a driving plate is arranged on a side of the driving motor in the height direction, a driven plate is arranged on a side of each sliding block away from the support column, and the driving plate and the driven plate are detachably connected.

[0016] By adopting the technical scheme, the piston rod of the driving cylinder is controlled to extend, and then the driving motor is driven to move, after the driving plate and the driven plate contact during the movement, the driving plate is connected with the driven plate, the piston rod of the driving cylinder is continuously controlled to extend, the sliding block is driven to move, and then the two cleaning rods are driven to move, the two cleaning rods are moved to the positions abutting against the ribs respectively, the intersection between the ribs and the mounting plate can be cleaned by moving the sliding frame, and the convenience is high; after welding at the intersection between one of the ribs and the mounting plate is completed, the piston rod of the driving cylinder is controlled to retract, and then the driving motor, the welding gun, the driven plate and the cleaning rod are driven to move, after the cleaning rod moves to the upper end of the supporting column, the driving plate is disconnected with the driven plate, and the sliding block is restored, the structure is simple, and the driving is convenient.

[0017] Optionally, each sliding block is detachably connected with the upper end of the supporting column.

[0018] By adopting the technical scheme, when the cleaning rods are used, the driving plate drives the driven plate to restore, the sliding block is connected with the supporting part when the sliding block moves to the upper end of the supporting column, the connection between the driving plate and the driven plate can be cancelled, the structure is simple, and the driving is convenient.

[0019] Optionally, the two ends of each sliding block in the length direction are slidably connected with connecting blocks, the edges of the connecting blocks are provided with round corners, elastic members are arranged between the connecting blocks and the sliding blocks, and a plurality of grooves matched with the connecting blocks are formed in the supporting column in one-to-one correspondence.

[0020] By adopting the technical scheme, when the sliding block is connected with the supporting column, the elastic members restore, the connecting blocks enter the inside of the corresponding grooves, the connection between the sliding block and the supporting column is completed, the elastic members are compressed when the sliding block is connected with the supporting column, and the connecting blocks move to the outside of the grooves, so that the structure is simple.

[0021] Optionally, a gear is arranged on the outside of the supporting column, and driving racks are arranged at equal intervals on the upper end of frame two, the driving racks are matched with the driving gear and are in meshing connection.

[0022] By adopting the technical scheme, after welding on one of the ribs is completed, when the driving cylinder is controlled to slide on the sliding frame, the driving gear rotates after contacting with the driving rack, the supporting column is driven to rotate, the positions of the sliding blocks are changed, the cleaning rods for cleaning the ribs and the mounting plate are not used when welding on the next rib is performed, the cleaning effect on the ribs and the mounting plate is improved, and the stability of subsequent welding on the ribs and the mounting plate is improved.

[0023] Optionally, an electromagnet is arranged on the lower end of the driving plate, and each driven plate is made of a magnetically attractable metal material.

[0024] By adopting the technical scheme, the driven plate can be attracted by the operating electromagnet to complete the connection of the driving plate and the driven plate, the structure is simple, the connection is convenient, when disassembling, the operating electromagnet is turned off, and the convenience is high.

[0025] In a second aspect, the application provides a welding process for a steel box girder of a viaduct, which adopts the following technical scheme:

[0026] A welding process for a steel box girder of a viaduct, comprising the following steps:

[0027] S1: placing the mounting plate on the supporting plate, and placing the rib plates at equal intervals on the upper end of the mounting plate;

[0028] S2: abutting the rib plates on the mounting plate;

[0029] S3: operating the piston rod of the driving cylinder to extend, driving the driving motor, the driving plate and the welding gun to move close to the junction of the rib plate and the mounting plate;

[0030] S4: when the driving plate moves to the driven plate, abutting one of the driven plates, driving the sliding block to move, and abutting the cleaning rod with the junction of the rib plate and the mounting plate;

[0031] S5: moving the sliding frame, driving the cleaning rod to move, cleaning the junction of the rib plate and the mounting plate, and driving the welding gun to move, welding the cleaned junction of the rib plate and the mounting plate;

[0032] S6: after welding one rib plate, operating the driving plate and the driven plate to be connected, operating the sliding frame to restore to the initial direction, and operating the piston rod of the driving cylinder to retract, driving the driving motor, the driving plate and the welding gun to move away from the rib plate and the mounting plate;

[0033] S7: operating the driving cylinder to slide along the length direction of the sliding frame, while rotating the supporting column under the driving of the driving rack, and moving the driving cylinder above the next rib plate to be welded;

[0034] S8: repeating the step S3;

[0035] S9: when the driving plate moves to the driven plate, abutting the other driven plate, driving the sliding block to move, and abutting the cleaning rod with the junction of the rib plate and the mounting plate;

[0036] S10: repeating the steps S5-S9.

[0037] In summary, the application has at least one of the following beneficial technical effects:

[0038] 1. The highlight of the present application is that after the welding of one of the rib plates is completed, the driving gear rotates after contacting the driving rack when the driving cylinder slides on the sliding frame, thereby driving the supporting column to rotate and changing the positions of the sliding blocks, and before the next rib plate is welded, the cleaning rod for cleaning the rib plate and the mounting plate is not used, thereby improving the cleaning effect of the rib plate and the mounting plate and the stability of subsequent welding.

[0039] 2. The mounting plate is placed on the upper end surface of the supporting plate, the rib plates are placed at equal intervals on the upper end of the mounting plate, and the rib plates are pressed on the mounting plate, so that the sliding frame can be moved. The junction between the rib plate and the mounting plate to be welded is cleaned by the cleaning assembly, and the junction between the cleaned rib plate and the mounting plate is welded by the welding assembly. When the rib plate and the mounting plate are welded, there are fewer impurities, the welding effect is better, and the welding stability between the rib plate and the mounting plate is higher.

[0040] 3. After one of the rib plates is welded by the welding gun, the driving cylinder is operated to slide on the sliding frame, and the supporting block is driven to slide during the sliding of the driving cylinder. When the supporting block slides to the next position to be cleaned, the supporting column can be operated to rotate, thereby adjusting the positions of the sliding blocks. The unused cleaning rod is directed to the position opposite the driving motor, and the sliding frame can be moved. The junction between the rib plate and the mounting plate to be welded is cleaned by the unused cleaning rod, thereby improving the cleaning effect of the junction between the rib plate and the mounting plate to be welded. The junction between the cleaned rib plate and the mounting plate is welded by the welding gun. When the rib plate and the mounting plate are welded, there are fewer impurities, the welding effect is better, and the welding stability between the rib plate and the mounting plate is higher. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 It is a schematic diagram of the overall structure of a steel box girder welding device for a viaduct.

[0042] Figure 2 It is a schematic diagram of the highlighted motor one.

[0043] Figure 3 It is a sectional view schematic diagram of the sliding block.

[0044] Figure 4 It is Figure 2 the enlarged schematic diagram of part A in

[0045] 100, rib plate; 200, mounting plate; 1, welding frame; 2, support plate; 21, support table; 211, table one; 212, table two; 22, chain wheel one; 221, chain one; 222, motor one; 3, sliding frame; 31, vertical plate; 311, chain wheel two; 312, chain two; 32, support block; 4, welding assembly; 41, support frame; 411, connecting rod; 412, welding gun; 42, driving cylinder; 43, driving motor; 431, driving plate; 5, cleaning assembly; 51, support column; 52, sliding block; 521, support rod; 522, cleaning rod; 523, driven plate; 53, driving gear; 54, driving rack; 6, sliding rail; 7, connecting block; 71, elastic piece; 8, groove; 9, connecting plate. DETAILED DESCRIPTION

[0046] The application will be further described in detail below with reference to all the accompanying drawings.

[0047] The application discloses a welding device for steel box girder of viaduct.

[0048] Reference Figure 1 and Figure 2 The welding device for steel box girder of viaduct comprises a welding frame 1, the welding frame 1 comprises a support plate 2, both sides of the support plate 2 in the length direction are provided with support tables 21, the welding frame 1 further comprises a sliding frame 3, the sliding frame 3 is horizontally and slidably connected to the two support tables 21, the sliding frame 3 is movably connected with a welding assembly 4 used for welding rib plates 100 and mounting plates 200, the sliding frame 3 is further movably connected with a cleaning assembly 5 used for cleaning the junctions of the rib plates 100 and the mounting plates 200, the mounting plate 200 is placed on the upper end surface of the support plate 2, the rib plates 100 are placed on the upper end of the mounting plate 200 at equal intervals, the rib plates 100 are pressed on the mounting plate 200, then the sliding frame 3 is moved, first, the cleaning assembly 5 is used to clean the junctions of the rib plates 100 and the mounting plates 200 to be welded, then the welding gun 412 is used to weld the cleaned junctions of the rib plates 100 and the mounting plates 200, when the rib plates 100 and the mounting plates 200 are welded, there are less impurities, the welding effect is better, and the welding stability between the rib plates 100 and the mounting plates 200 is higher.

[0049] Reference Figure 1 and Figure 2The upper end of each support table 21 is provided with a sliding rail 6, and a sliding frame 3 is sleeved outside the sliding rail 6 and can slide on the sliding rail 6; one support table 21 is set as table one 211, and the other support table 21 is set as table two 212, the side of the table one 211 away from the table two 212 is rotationally connected with two chain wheels one 22, the two chain wheels one 22 are respectively arranged on the two sides of the length direction of the table one 211, the outside of the two chain wheels one 22 is engaged with a chain one 221, and the end of the table one 211 away from the table two 212 is provided with a motor one 222, the output shaft of the motor one 222 is coaxially fixedly connected with one of the chain wheels one 22, and the upper end of the chain is fixedly connected with the sliding frame 3; before the rib plate 100 and the mounting plate 200 are cleaned and welded, the output shaft of the motor one 222 is first operated to rotate, thereby driving the two chain wheels one 22 and the chain one 221 to move, thereby driving the sliding frame 3 to move, and the sliding frame 3 moves to one end of the length direction of the mounting plate 200.

[0050] With reference to Figure 1 and Figure 2 , the sliding frame 3 is horizontally and slidably connected with a driving cylinder 42, a driving motor 43 is arranged on the piston rod of the driving cylinder 42, the welding assembly 4 comprises a support frame 41, a connecting rod 411 and a welding gun 412, the support frame 41 is arranged above the connecting rod 411, the welding gun 412 is arranged at the lower end of the connecting rod 411, the output shaft of the driving motor 43 is fixedly connected with the upper end of the support frame 41, and the connecting rod 411 is fixed on the support frame 41.

[0051] With reference to Figure 1 and Figure 3 , the side of the driving cylinder 42 away from the sliding frame 3 is fixedly connected with a support block 32, the side of the support block 32 close to the driving cylinder 42 is provided with a connecting plate 9, the driving cylinder 42 is arranged at the upper end of the connecting plate 9, and the output shaft of the driving cylinder 42 extends to the lower end of the connecting plate 9, the connecting plate 9 is slidably connected with the upper end of the sliding frame 3, and the cleaning assembly 5 comprises a support column 51, the support column 51 is rotationally connected to the lower end of the support block 32, a plurality of sliding blocks 52 are vertically and slidably connected to the support column 51, the lower end of each sliding block 52 is provided with two support rods 521, the lower end of each support rod 521 is provided with a cleaning rod 522, and the two cleaning rods 522 on the same sliding block 52 are obliquely arranged away from each other.

[0052] With reference to Figure 1 and Figure 3The sliding frame 3 comprises a vertical plate 31 horizontally arranged at the upper end of the sliding frame 3, and chain wheels two 311 are arranged at the length direction of the two sides of the vertical plate 31. The outer parts of the two chain wheels two 311 are engaged with a chain two 312, the chain two 312 is sleeved on the outer parts of the two chain wheels two 311, the connecting plate 9 is fixedly connected with the chain two 312, and a motor two is arranged at the end of the vertical plate 31 away from the chain wheels two 311. The output shaft of the motor two is coaxially fixedly connected with one of the chain wheels two 311 through the vertical plate 31. The output shaft of the motor two is rotated to move the cleaning assembly 5 and the welding assembly 4 to one side of the length direction of the supporting plate 2.

[0053] Before welding, first use the fixing device to fix a plurality of rib plates 100 on the mounting table, and then start to clean the rib plates 100 and the mounting table; the fixing device is a prior art, which can fix the rib plates 100, and will not be described in detail in this embodiment.

[0054] Referring to Figure 1 and Figure 4 , the piston rod of the driving cylinder 42 is stretched to drive the driving motor 43, the supporting frame 41, the connecting rod 411 and the welding gun 412 to move towards the rib plate 100. The driving plate 431 is arranged on one side of the driving motor 43 in the height direction. The driven plate 523 is arranged on the side of each sliding block 52 away from the supporting column 51. The driving plate 431 is detachably connected with the driven plate 523. Each sliding block 52 is detachably connected with the upper end of the supporting column 51. When the driving plate 431 contacts with one of the driven plates 523, the sliding block 52 is driven to move towards the rib plate 100. The cleaning cotton is arranged on the lower end of the cleaning rod 522. The cleaning cotton on the lower end of the cleaning rod 522 moves to the position abutting against the junction of the rib plate 100 and the mounting plate 200.

[0055] The cleaning cotton is preferably high-temperature-resistant sponge. A protective coating can be coated on the outer surface of the cleaning cotton. Both are prior art, and will not be described in detail in this embodiment.

[0056] Referring to Figure 1 and Figure 2 , the output shaft of the motor one 222 is rotated to drive the cleaning rod 522 to move and clean the junction of the rib plate 100 and the mounting plate 200. When the output shaft of the motor one 222 continues to rotate, the head of the welding gun 412 moves above the rib plate 100 and the mounting plate 200, and the rib plate 100 and the mounting plate 200 can be welded by the welding gun 412. The cleaning cotton can push the welding slag during the welding process of the welding gun 412.

[0057] Referring to Figure 2 and Figure 4The lower end of the driving plate 431 is provided with an electromagnet, and each driven plate 523 is made of magnetically attractable metal material; after welding one side of the rib plate 100 in the length direction is completed, the output shaft of the second motor is rotated to drive the welding assembly 4 and the cleaning assembly 5 to move; then the piston rod of the driving cylinder 42 is retracted, the electromagnet is turned on, and the driven plate 523 is driven to move towards the support column 51, so that the sliding block 52 (refer to Figure 3 ) is moved to the position connected with the support column 51, and the electromagnet is turned off.

[0058] Refer to Figure 2 and Figure 3 , the two ends of each sliding block 52 in the length direction are slidably connected with a connecting block 7, the edges of the connecting block 7 are provided with rounded corners, the connecting block 7 is provided with an elastic element 71 between the sliding block 52, a plurality of grooves 8 adapted to the connecting block 7 are formed on the support column 51, the grooves 8 correspond to the connecting block 7 one by one, and as the connecting block 7 enters the inside of the corresponding groove 8, the elastic element 71 extends to drive the sliding block 52 to move into the groove 8, and the restoration of the sliding block 52 is completed.

[0059] Refer to Figure 1 and Figure 3 , the outside of the support column 51 is sleeved with a driving gear 53, and the side of the sliding frame 3 close to the support column 51 is provided with a driving rack 54, the driving rack 54 is adapted to the driving gear 53 and is engaged with each other, as the cleaning assembly 5 moves, the driving gear 53 rotates after contacting with the driving rack 54, thereby driving the support column 51 to rotate, thereby changing the positions of the plurality of sliding blocks 52, and the cleaning rod 522 used for cleaning the rib plate 100 and the mounting plate 200 is not used in the next welding, thereby improving the cleaning effect of the rib plate 100 and the mounting plate 200, and thereby improving the stability of the subsequent welding of the rib plate 100 and the mounting plate 200.

[0060] The application also discloses a welding process of a steel box girder for a viaduct, which comprises the following steps:

[0061] S1: placing the mounting plate 200 on the support plate 2, and placing the rib plate 100 at equal intervals on the upper end of the mounting plate 200;

[0062] S2: abutting the plurality of rib plates 100 on the mounting plate 200;

[0063] S3: extending the piston rod of the driving cylinder 42 to drive the driving motor 43, the driving plate 431 and the welding gun 412 to move close to the junction of the rib plate 100 and the mounting plate 200;

[0064] S4: when the driving plate 431 moves to the driven plate 523, it abuts against one of the driven plates 523, drives the sliding block 52 to move, and the cleaning rod 522 abuts against the intersection of the rib plate 100 and the mounting plate 200;

[0065] S5: move the sliding frame 3, drive the cleaning rod 522 to move, clean the intersection of the rib plate 100 and the mounting plate 200, and drive the welding gun 412 to move to weld the cleaned intersection of the rib plate 100 and the mounting plate 200;

[0066] S6: after welding one rib plate 100, connect the driving plate 431 and the driven plate 523, control the sliding frame 3 to return to the initial direction, and control the piston rod of the driving cylinder 42 to retract, so as to drive the driving motor 43, the driving plate 431 and the welding gun 412 to move away from the rib plate 100 and the mounting plate 200;

[0067] S7: control the driving cylinder 42 to slide along the length direction of the sliding frame 3, and at the same time, the supporting column 51 rotates under the drive of the driving rack 54, and the driving cylinder 42 moves to the upper side of the next rib plate 100 to be welded;

[0068] S8: repeat the step S3;

[0069] S9: when the driving plate 431 moves to the driven plate 523, it abuts against the other driven plate 523, drives the sliding block 52 to move, and the cleaning rod 522 abuts against the intersection of the rib plate 100 and the mounting plate 200;

[0070] S10: repeat the steps S5-S9.

[0071] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, and therefore: any equivalent changes made on the basis of the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A welding device for steel box girder of viaduct, comprising a welding stand (1), characterized in that: The welding frame (1) comprises a support plate (2), both sides of the length direction of the support plate (2) are provided with support tables (21), the welding frame (1) further comprises a sliding frame (3), the sliding frame (3) is horizontally slidably connected to the two support tables (21), a welding assembly (4) for welding the rib plate (100) and the mounting plate (200) is movably connected to the sliding frame (3), and a cleaning assembly (5) for cleaning the junction of the rib plate (100) and the mounting plate (200) is movably connected to the sliding frame (3); The driving cylinder (42) is horizontally slidably connected to the sliding frame (3), a driving motor (43) is arranged on the piston rod of the driving cylinder (42), the welding assembly (4) comprises a support frame (41), a connecting rod (411) and a welding gun (412), the support frame (41) is arranged above the connecting rod (411), the welding gun (412) is arranged at the lower end of the connecting rod (411), the output shaft of the driving motor (43) is fixedly connected to the upper end of the support frame (41), and the connecting rod (411) is fixed to the support frame (41); The driving cylinder (42) is fixedly connected to the support block (32) away from the sliding frame (3), the cleaning assembly (5) comprises a support column (51), the support column (51) is rotatably connected to the lower end of the support block (32), a plurality of sliding blocks (52) are vertically slidably connected to the support column (51), two support rods (521) are arranged at the lower end of each sliding block (52), and a cleaning rod (522) is arranged at the lower end of each support rod (521); The driving motor (43) is provided with a driving plate (431) on one side in the height direction, each sliding block (52) is provided with a driven plate (523) on the side away from the support column (51), and the driving plate (431) and the driven plate (523) are detachably connected.

2. The welding device for steel box girder of high bridge according to claim 1, characterized in that: The two cleaning rods (522) located on the same sliding block (52) are arranged in a direction away from each other.

3. The welding device for steel box girder of viaduct according to claim 2, characterized in that: Each sliding block (52) is detachably connected to the upper end of the support column (51).

4. The welding device for steel box girder of viaduct according to claim 3, characterized in that: Each sliding block (52) is slidably connected to a connecting block (7) at both ends in the length direction, the edges of the connecting block (7) are provided with rounded corners, an elastic member (71) is arranged between the connecting block (7) and the sliding block (52), a plurality of grooves (8) matched with the connecting block (7) are formed in the support column (51), and the grooves (8) correspond to the connecting block (7) in a one-to-one manner.

5. The welding device for steel box girder of viaduct according to claim 4, characterized in that: The support column (51) is externally sleeved with a driving gear (53), and the sliding frame (3) is provided with a driving rack (54) on the side close to the support column (51), the driving rack (54) is matched with the driving gear (53) and is engaged with the driving gear (53).

6. The welding device for steel box girder of viaduct according to claim 2, characterized in that: The lower end of the driving plate (431) is provided with an electromagnet, and each driven plate (523) is made of a magnetically attractable metal material.

7. A welding process for a steel box girder for a viaduct, characterized by: The welding device for the steel box girder of the viaduct is used for welding the rib plate (100) and the mounting plate (200), and comprises the following steps: S1: placing the mounting plate (200) on the support plate (2) and placing the rib plate (100) at equal intervals on the upper end of the mounting plate (200); S2: several ribs (100) are tightly arranged on the mounting plate (200); S3: the piston rod of the driving cylinder (42) is extended to drive the driving motor (43), the driving plate (431) and the welding gun (412) to move close to the junction of the rib (100) and the mounting plate (200); S4: when the driving plate (431) moves to the driven plate (523), it abuts against one of the driven plates (523) to drive the sliding block (52) to move, and the cleaning rod (522) abuts against the junction of the rib (100) and the mounting plate (200); S5: the sliding frame (3) is moved to drive the cleaning rod (522) to move, clean the junction of the rib (100) and the mounting plate (200), and drive the welding gun (412) to move to weld the cleaned junction of the rib (100) and the mounting plate (200); S6: after welding one rib (100), the driving plate (431) and the driven plate (523) are connected, the sliding frame (3) is restored to the initial direction, and the piston rod of the driving cylinder (42) is retracted to drive the driving motor (43), the driving plate (431) and the welding gun (412) to move away from the rib (100) and the mounting plate (200); S7: the driving cylinder (42) is driven to slide along the length direction of the sliding frame (3), and the support column (51) is rotated under the driving of the driving rack (54) while moving, and the driving cylinder (42) moves above the next rib (100) to be welded; S8: repeat S3; S9: when the driving plate (431) moves to the driven plate (523), it abuts against another driven plate (523) to drive the sliding block (52) to move, and the cleaning rod (522) abuts against the junction of the rib (100) and the mounting plate (200); S10: repeat S5-S9.

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