CN112872677A

CN112872677A - Device for welding steel structure

Info

Publication number: CN112872677A
Application number: CN202011546657.XA
Authority: CN
Inventors: 郭莉莉; 张晋文
Original assignee: SHANGHAI HONGPU STEEL STRUCTURE ENGINEERING CO LTD
Current assignee: SHANGHAI HONGPU STEEL STRUCTURE ENGINEERING CO LTD
Priority date: 2020-12-24
Filing date: 2020-12-24
Publication date: 2021-06-01
Anticipated expiration: 2040-12-24
Also published as: CN112872677B

Abstract

The application relates to the technical field of steel structure welding, in particular to a device for welding a steel structure, which comprises a first clamping mechanism arranged on the ground, a second clamping mechanism arranged on the ground and a welding workbench arranged between the first clamping mechanism and the second clamping mechanism; the first clamping mechanism and the second clamping mechanism are identical in structure and are symmetrically arranged relative to the welding workbench. In the welding process, the steel structure needs to be rotated, when welding is carried out on the next step, a worker synchronously rotates the first clamping mechanism and the second clamping mechanism, the steel structure can be rotated, the whole welding process does not need to clamp and adjust the steel structure again, and the time for clamping and adjusting the steel structure by the worker is saved. This application has that the staff need not adjustment position of oneself by a wide margin just can accomplish weldment work, improves staff's welding efficiency's effect.

Description

Device for welding steel structure

Technical Field

The application relates to the technical field of steel structure welding, in particular to a device for steel structure welding.

Background

With the rapid development of urban construction in China, the technologies of fatigue, welding, vibration, design, manufacture, construction and the like of the steel structure bridge are increasingly mature, and the steel structure is widely applied to the fields of bridges, railways, highways and the like. In practical use, some large steel structures are spliced by welding several small steel structures.

The inventors consider that there is a drawback to the related art among the above. When welding the concatenation to miniature steel construction, need carry out a plurality of faces to the steel construction and weld usually, need remove and rotate the steel construction, because the weight of steel construction is great, make the weld joint of steel construction change very easily at removal and pivoted in-process, need readjust the position of steel construction, lead to weldment work's work efficiency lower.

Disclosure of Invention

Reduce steel construction welded change for the removal and rotate the steel construction, reduce staff's the amount of labour and intensity of labour, improve weldment work's work efficiency, this application provides a device for steel construction welding.

The application provides a device is used in steel construction welding adopts following technical scheme:

a device for welding a steel structure comprises a first clamping mechanism arranged on the ground, a second clamping mechanism arranged on the ground and a welding workbench arranged between the first clamping mechanism and the second clamping mechanism; the first clamping mechanism and the second clamping mechanism have the same structure and are symmetrically arranged relative to the welding workbench;

first fixture is including setting up at vertical fixed wall, the swing table of sliding connection on the fixed wall and fixing the centre gripping subassembly on the swing table of fixing on subaerial, swing table sliding connection is on the side that the fixed wall is close to weldment work platform, the centre gripping subassembly is fixed and is being close to weldment work platform's side cement pipe at the swing table, the centre gripping subassembly level sets up, the one end setting of centre gripping subassembly is directly over weldment work platform.

By adopting the technical scheme, when welding the steel structure workpiece, a worker clamps and fixes two ends of the steel structure workpiece by using the first clamping mechanism and the second clamping mechanism, and then places the steel structure workpiece to be welded on the welding workbench for welding; in welding process, need rotate the steel construction, when welding on next step, the staff rotates first fixture and second fixture in step, rotate the steel construction can, whole welding process need not be with the steel construction clamping again, the adjustment, the time of staff's clamping and adjustment steel construction has been saved, the staff can use the position of first fixture and second fixture adjustment steel construction according to the position and the shape of weld joint simultaneously, the staff need not by a wide margin adjustment position oneself just can accomplish weldment work, staff's welding efficiency has been improved.

Optionally, the movable table includes a horizontal moving table slidably connected to the fixed wall, a vertical moving table slidably connected to the horizontal moving table, and a rotating table fixedly connected to the vertical moving table, the horizontal moving table can move on the fixed wall in the horizontal direction, the vertical moving table can move on the horizontal moving table in the vertical direction, the rotating table is perpendicular to the vertical moving table, and the rotating table can rotate around its own axis.

Through adopting above-mentioned technical scheme, the staff can be through the position of horizontal migration platform and vertical mobile platform adjustment centre gripping subassembly to the position of the first fixture of adjustment and the centre gripping steel construction of second fixture is through the angle of swivel mount adjustment steel construction, thereby makes things convenient for the staff to weld the steel construction, reduces staff's intensity of labour.

Optionally, a horizontal guide rail and a horizontal driving motor are fixed on the side face of the fixed wall, a horizontal lead screw is rotatably connected on the side face of the fixed wall, at least two horizontal guide rails are arranged, the horizontal lead screw is arranged in the middle of the horizontal guide rail, a power output shaft of the horizontal driving motor is fixedly connected with the horizontal lead screw, a horizontal moving platform is slidably connected onto the horizontal guide rail, and the horizontal moving platform is in threaded fit with the horizontal lead screw.

By adopting the technical scheme, when the position of the horizontal moving platform is adjusted by a worker, the worker starts the horizontal driving motor, the power output shaft of the horizontal driving motor drives the horizontal lead screw to rotate, and when the horizontal lead screw rotates, the horizontal lead screw pushes the horizontal moving platform to slide along the horizontal smooth rail under the action of the threads.

Optionally, the horizontal moving table is fixedly connected with vertical guide rails and a vertical driving motor, the horizontal moving table is rotatably connected with vertical lead screws, the number of the vertical guide rails is at least two, the vertical lead screws are arranged between the vertical guide rails, a power output shaft of the vertical driving motor is fixedly connected with the vertical moving table, the vertical moving table is slidably connected to the vertical guide rails, and the vertical moving table is in threaded fit with the vertical lead screws.

By adopting the technical scheme, when the position of the vertical table is adjusted by a worker, the worker starts the vertical driving motor, the power output shaft of the vertical driving motor drives the vertical lead screw to rotate, and when the vertical lead screw rotates, the vertical lead screw pushes the vertical moving table to slide along the vertical sliding rail under the action of the threads.

Optionally, the rotating table is hollow, a rotating drive motor is fixedly connected to the inside of the rotating table, a rotating seat is rotatably connected to the side face of the rotating table, a power output shaft of the rotating drive motor is fixedly connected with the rotating seat, and the clamping assembly is fixed to the rotating seat.

Through adopting above-mentioned technical scheme, when the staff when the angle of adjustment steel construction, start and rotate driving motor, the power output shaft who rotates driving motor can the drive state rotate around power output shaft, and the state drives the centre gripping subassembly when rotating and rotates, and the centre gripping subassembly can drive the steel construction and rotate together when rotating.

Optionally, the clamping assembly comprises a fixed rod fixedly connected to the side surface of the rotating seat, an expansion rod connected to one end of the fixed rod, and a chuck for clamping and fixing the steel structure; the equal level of dead lever and telescopic link sets up, the one end of chuck articulates there is the universal joint, the chuck passes through the universal joint and articulates the tip at the telescopic link.

By adopting the technical scheme, the fixing rod provides support for the chuck for clamping the steel structure, and meanwhile, a worker can enable the steel structure to incline through the telescopic rod and the universal joint in a matching manner; after the steel construction slope, during the staff need rotate the time steel construction, the universal joint can be with the rotation moment of torsion transmission of dead lever to the steel construction of slope on, make the steel construction of slope rotate along with this dead lever together.

Optionally, one end of the telescopic rod is provided with a first connecting seat fixedly connected with, the first connecting seat is fixedly connected with a hydraulic cylinder, one end of the fixed rod is fixedly connected with a second connecting seat, and one end of the hydraulic cylinder is fixedly connected with the second connecting seat.

Through adopting above-mentioned technical scheme, use first connecting seat and second connecting seat to connect the telescopic link on the dead lever, the pneumatic cylinder is used for adjusting the length of telescopic link, and when the dead lever rotated, the telescopic link of being connected with the dead lever also can be along with rotating together, and the moment of torsion on the dead lever can be transmitted to the telescopic link through second connecting seat and first connecting seat on, and the pneumatic cylinder can not bear great moment of torsion to the protection pneumatic cylinder.

Optionally, a plurality of connecting rods are fixedly connected to the first connecting seat, the connecting rods are horizontally arranged, the connecting rods penetrate through the second connecting seat, and the connecting rods can slide along the horizontal direction along with the first connecting seat.

By adopting the technical scheme, the first connecting seat and the second connecting seat are connected through the connecting rod, meanwhile, the connecting rod is in sliding connection with the second connecting seat, when the hydraulic cylinder extends, the connecting rod slides on the second connecting seat, and the connecting rod cannot block the hydraulic cylinder from extending and retracting; when the dead lever took place to rotate, the fixed thick stick can transmit the moment of torsion to the telescopic link through second connecting seat, connecting rod and first connecting seat on, can not bear great moment of torsion on the pneumatic cylinder.

Optionally, one end of the chuck is slidably connected with a first clamping jaw and a second clamping jaw, the first clamping jaw is provided with two clamping jaws, the first clamping jaw is arranged in a collinear manner, the second clamping jaw is arranged on the same side of the first clamping jaw, the second clamping jaw is perpendicular to the first clamping jaw, the first clamping jaw and the second clamping jaw are both provided with two clamping jaws, the first clamping jaw and the second clamping jaw correspond to each other one by one, and the first clamping jaw and the second clamping jaw are both provided with locking bolts.

Through adopting above-mentioned technical scheme, when the centre gripping steel construction, it is fixed with the cooperation centre gripping of steel construction through first jack catch and second jack catch.

Optionally, the locking bolt passes through the first jaw and is in threaded fit with the first jaw, and the locking bolt is rotatably connected with the chuck.

Through adopting above-mentioned technical scheme, the staff can adjust the position of first jack catch through rotating the locking bolt, and when the locking bolt was rotating, under the effect of screw thread, first jack catch removed along the axis direction of locking bolt.

In summary, the present application includes at least one of the following beneficial technical effects:

1. when welding the steel structure workpiece, a worker clamps and fixes two ends of the steel structure workpiece by using a first clamping mechanism and a second clamping mechanism, and then places the steel structure workpiece to be welded on a welding workbench for welding; in the welding process, the steel structure needs to be rotated, when the next welding is carried out, a worker synchronously rotates the first clamping mechanism and the second clamping mechanism and rotates the steel structure, the steel structure does not need to be clamped and adjusted again in the whole welding process, the time for the worker to clamp and adjust the steel structure is saved, meanwhile, the worker can adjust the position of the steel structure by using the first clamping mechanism and the second clamping mechanism according to the position and the shape of a welding seam, the worker can complete the welding work without greatly adjusting the position of the worker, and the welding efficiency of the worker is improved;

2. when the position of the horizontal moving platform is adjusted by a worker, the worker starts the horizontal driving motor, a power output shaft of the horizontal driving motor drives the horizontal lead screw to rotate, and when the horizontal lead screw rotates, the horizontal lead screw pushes the horizontal moving platform to slide along the horizontal smooth rail under the action of threads; when a worker adjusts the position of the vertical table, the worker starts the vertical driving motor, a power output shaft of the vertical driving motor drives the vertical lead screw to rotate, and when the vertical lead screw rotates, the vertical lead screw pushes the vertical moving table to slide along the vertical sliding rail under the action of threads; when a worker adjusts the angle of the steel structure, the rotation driving motor is started, a power output shaft of the rotation driving motor can drive the state to rotate around the power output shaft, the state drives the clamping assembly to rotate when rotating, and the clamping assembly can drive the steel structure to rotate together when rotating;

3. the fixing rod provides support for a chuck for clamping a steel structure, meanwhile, a worker can enable the steel structure to incline through the telescopic rod and the universal joint in a matching mode, when the worker wants to incline the steel structure, the worker starts the moving platform on the first clamping assembly to move, the telescopic rod is started at the same time, the length of the telescopic cylinder is adjusted, and meanwhile, the universal joint can enable the steel structure to incline; after the steel construction slope, during the staff need rotate the time steel construction, the universal joint can be with the rotation moment of torsion transmission of dead lever to the steel construction of slope on, make the steel construction of slope rotate along with this dead lever together.

Drawings

Fig. 1 is a schematic perspective view of an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a horizontal mobile station and a vertical mobile station in the embodiment of the present application.

Fig. 3 is a schematic structural diagram of a rotating table in the embodiment of the present application.

Fig. 4 is a schematic view of a chuck structure in an embodiment of the present application.

Description of reference numerals: 1. a first clamping mechanism; 11. fixing a wall; 111. a horizontal guide rail; 112. a horizontal driving motor; 113. a horizontal lead screw; 12. a movable table; 121. a horizontal moving stage; 122. a vertical moving stage; 123. a rotating table; 124. a vertical guide rail; 125. a vertical drive motor; 126. a vertical lead screw; 127. rotating the drive motor; 128. a rotating seat; 13. a clamping assembly; 131. fixing the rod; 132. a telescopic rod; 133. a chuck; 134. a universal joint; 135. a first connecting seat; 136. a hydraulic cylinder; 137. a second connecting seat; 138. a first jaw; 139. a second jaw; 14. a locking bolt; 2. a second clamping mechanism; 3. a welding workbench; 4. a connecting rod.

Detailed Description

The present application is described in further detail below with reference to figures 1-4.

The embodiment of the application discloses device is used in steel construction welding. Referring to fig. 1, an apparatus for welding a steel structure includes a first clamping mechanism 1 fixed on the ground, a second clamping mechanism 2 fixed on the ground, and a welding table 3 disposed on the ground between the first clamping mechanism 1 and the second clamping mechanism 2. The first clamping mechanism 1 and the second clamping mechanism 2 are identical in structure and are symmetrically arranged with respect to the welding table 3. The first clamping mechanism 1 comprises a fixed wall 11 vertically arranged on the ground, a movable table 12 arranged on the fixed wall 11, and a clamping assembly 13 fixed on the movable table 12, wherein the clamping assembly 13 is perpendicular to the movable table 12.

The movable table 12 is movable on the fixed wall 11 in horizontal and vertical directions and is rotatable about its own axis. The clamping assemblies 13 in the first clamping mechanism 1 and the second clamping mechanism 2 can clamp and fix two ends of a steel structure on the welding workbench 3. In the welding process, when the steel structure needs to be rotated or moved, the worker starts the movable table 12 and adjusts the clamping assembly 13 to adjust the position of the steel structure, when the position of the steel structure is adjusted, a welding seam on the steel structure does not have large deformation, the steel structure does not need to be clamped and fixed again, the time of the worker is saved, and the working efficiency of welding work is improved.

Referring to fig. 1, the movable stage 12 includes a horizontal moving stage 121 slidably coupled to the fixed wall 11, a vertical moving stage 122 slidably coupled to the horizontal moving stage 121, and a rotating stage 123 fixed to the vertical moving stage 122. The horizontal moving stage 121 can move in the horizontal direction on the side of the fixed wall 11, the vertical moving stage 122 can move in the vertical direction on the side of the horizontal moving stage 121, and the rotating stage 123 can rotate on its axis.

Referring to fig. 2, at least two horizontal guide rails 111, one horizontal screw 113, and a horizontal driving motor 112 are installed on a side surface of the fixed wall 11, and the present embodiment will be specifically described by taking two horizontal guide rails 111 as an example. The horizontal screw 113 is installed in the middle of the horizontal guide rail 111, the horizontal moving table 121 is in sliding fit with the horizontal guide rail 111 and in threaded fit with the horizontal screw 113, and a power output shaft of the horizontal driving motor 112 is connected with the horizontal screw 113 through a coupler. When the worker starts the horizontal driving motor 112, the power output shaft of the horizontal driving motor 112 drives the horizontal lead screw 113 to rotate, and when the horizontal lead screw 113 rotates, the horizontal moving table 121 in threaded fit with the horizontal lead screw 113 moves in the horizontal direction along the horizontal guide rail 111 under the pushing of the threads.

Referring to fig. 2, at least two vertical guide rails 124, a vertical lead screw 126 and a vertical driving motor 125 are installed on a side surface of the horizontal moving stage 121, and the two vertical guide rails 124 are specifically described in this embodiment as an example. The vertical screw 126 is arranged between the two vertical guide rails 124, a power output shaft of the vertical driving motor 125 is connected with the vertical screw 126 through a coupler, and the vertical moving table 122 is in sliding fit with the vertical guide rails 124 and is in threaded fit with the vertical screw.

Referring to fig. 3, a rotating table 123 is welded on a side surface of the vertical moving table 122, the rotating table 123 is hollow, a rotating driving motor 127 is mounted inside the rotating table 123 by using bolts, a vertical rotating base 128 is rotatably connected on a side surface of the rotating table 123, a power output shaft of the rotating driving motor 127 is connected with the rotating base 128 by a spline, and an axis of the power output shaft of the rotating driving motor 127 coincides with an axis of the rotating base 128. When the worker starts the rotation driving motor 127, the power output shaft of the rotation driving motor 127 drives the rotation base 128 to rotate around its own axis.

During the welding process, the worker can control the position of the steel structure through the horizontal moving table 121, the vertical moving table 122 and the rotating table 123 according to actual conditions.

Referring to fig. 1 and 3, the clamping assembly 13 is fixed on a side surface of the rotating table 123, and the clamping assembly 13 includes a fixed rod 131 welded on the rotating base 128, a telescopic rod 132 fixedly connected to the fixed rod 131, and a chuck 133 hinged to the telescopic rod 132. Be connected through universal joint 134 between chuck 133 and the telescopic link 132, the one end welding of telescopic link 132 has first connecting seat 135, has second connecting seat 137 in the one end welding of dead lever 131, has four horizontally connecting rods 4 in the welding on first connecting seat 135, has seted up the through-hole that corresponds with connecting rod 4 on second connecting seat 137, and connecting rod 4 passes through-hole and second connecting seat 137 sliding connection.

A hydraulic cylinder 136 is installed between the first and

second link seats

135 and 137, and one end of the hydraulic cylinder 136 is installed on the first link seat 135 using a bolt and the other end is installed on the second link seat 137 using a bolt. When the rotating base 128 rotates, the fixing rod 131 rotates along with the rotating base 128, and the fixing rod 131 transmits torque to the telescopic rod 132 through the first connecting base 135, the connecting rod 4 and the second connecting base 137, so as to drive the telescopic rod 132, the universal joint 134, the chuck 133 and the steel structure to rotate together.

In welding process, when needing to incline the steel construction, the staff only need with first fixture 1 or 2 lifts of second fixture can, universal joint 134 can transmit the moment of torsion to chuck 133 simultaneously, make the steel construction keep former angle in the time, also can rotate, make things convenient for the staff to carry out steel construction welding work.

Referring to fig. 4, four sliding grooves are formed in the chuck 133, a first jaw 138 and a second jaw 139 are slidably connected inside the sliding grooves, two first jaws 138 and two second jaws 139 are arranged, the first jaws 138 are arranged in a collinear manner, the second jaws 139 are arranged on the same side of the first jaws 138 and perpendicular to the first jaws 138, and each second jaw 139 corresponds to one first jaw 138. A locking bolt 14 is rotatably installed at the bottom of each slide groove, the locking bolt 14 is arranged along the sliding direction of the first jaw 138 and the second jaw 139, the locking bolt 14 passes through the first jaw 138 or the second jaw 139, and the locking bolt 14 is in threaded engagement with the first jaw 138 or the second jaw 139.

When a worker clamps a steel structure workpiece, the end part of the steel structure workpiece is placed between the clamping jaws, then the locking bolt 14 is rotated, and the first clamping jaw 138 and the second clamping jaw 139 are matched together to clamp and fix the steel structure workpiece under the action of threads.

The implementation principle of the embodiment of the application is as follows: when welding a steel structure workpiece, a worker clamps the steel structure workpiece on the chuck 133, then adjusts the position of the movable table 12, adjusts the position and the angle of the steel structure workpiece, and then starts welding. In welding process, the staff can be according to actual conditions, the position of adjustment first fixture 1 and second fixture 2 to the position, turned angle and the inclination of adjustment steel construction.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a device is used in steel construction welding which characterized in that: the device comprises a first clamping mechanism (1) arranged on the ground, a second clamping mechanism (2) arranged on the ground and a welding workbench (3) arranged between the first clamping mechanism (1) and the second clamping mechanism (2); the first clamping mechanism (1) and the second clamping mechanism (2) are identical in structure and are symmetrically arranged relative to the welding workbench (3);

first fixture (1) is including setting up at vertical fixed wall (11), the movable table (12) of sliding connection on fixed wall (11) and fixing centre gripping subassembly (13) on movable table (12) of fixing at subaerial fixed wall (11), movable table (12) sliding connection is on fixed wall (11) are close to the side of weldment work platform (3), centre gripping subassembly (13) are fixed and are close to the side cement pipe of weldment work platform (3) at movable table (12), centre gripping subassembly (13) level sets up, the one end setting of centre gripping subassembly (13) is directly over weldment work platform (3).

2. The device for welding the steel structure according to claim 1, wherein: the movable table (12) comprises a horizontal moving table (121) which is connected to the fixed wall (11) in a sliding mode, a vertical moving table (122) which is connected to the horizontal moving table (121) in a sliding mode and a rotating table (123) which is fixedly connected to the vertical moving table (122), the horizontal moving table (121) can move on the fixed wall (11) along the horizontal direction, the vertical moving table (122) can move on the horizontal moving table (121) along the vertical direction, the rotating table (123) is perpendicular to the vertical moving table (122) and is arranged, and the rotating table (123) can rotate around the axis of the rotating table (123).

3. The device for welding the steel structure according to claim 2, wherein: the side of the fixed wall (11) is fixed with a horizontal guide rail (111) and a horizontal driving motor (112), the side of the fixed wall (11) is rotatably connected with a horizontal lead screw (113), at least two horizontal guide rails (111) are arranged, the horizontal lead screw (113) is arranged in the middle of the horizontal guide rails (112), a power output shaft of the horizontal driving motor (112) is fixedly connected with the horizontal lead screw (113), a horizontal moving platform (121) is connected to the horizontal guide rails (111) in a sliding mode, and the horizontal moving platform (121) is in threaded fit with the horizontal lead screw (113).

4. The device for welding the steel structure according to claim 2, wherein: fixedly connected with vertical guide rail (124) and vertical driving motor (125) on horizontal migration platform (121), rotate on horizontal migration platform (121) and be connected with vertical lead screw (126), vertical guide rail (124) are equipped with two at least, vertical lead screw (126) set up between vertical guide rail (124), the power output shaft fixed connection of vertical driving motor (125), vertical migration platform (122) sliding connection is on vertical guide rail (124), vertical migration platform (122) and vertical lead screw (126) screw-thread fit.

5. The device for welding the steel structure according to claim 2, wherein: the rotary table (123) is hollow, the rotary driving motor (127) is fixedly connected to the inside of the rotary table (123), the rotary seat (128) is rotatably connected to the side face of the rotary table (123), a power output shaft of the rotary driving motor (127) is fixedly connected with the rotary seat (128), and the clamping assembly (13) is fixed on the rotary seat (128).

6. The device for welding the steel structure according to claim 5, wherein: the clamping assembly (13) comprises a fixed rod (131) fixedly connected to the side surface of the rotating seat (128), a telescopic rod (132) connected to one end of the fixed rod (131) and a chuck (133) used for clamping and fixing a steel structure; the fixing rod (131) and the telescopic rod (132) are horizontally arranged, one end of the chuck (133) is hinged to a universal joint (134), and the chuck (133) is hinged to the end portion of the telescopic rod (132) through the universal joint (134).

7. The device for welding the steel structure according to claim 6, wherein: the one end of telescopic link (132) is equipped with first connecting seat of fixedly connected with (135), fixedly connected with pneumatic cylinder (136) on first connecting seat (135), dead lever (131) one end fixedly connected with second connecting seat (137), the one end and the second connecting seat (137) fixed connection of pneumatic cylinder (136).

8. The device for welding the steel structure according to claim 7, wherein: a plurality of connecting rods (4) are fixedly connected to the first connecting seat (135), the connecting rods (4) are horizontally arranged, the connecting rods (4) penetrate through the second connecting seat (137), and the connecting rods (4) can slide along the horizontal direction along with the first connecting seat (135).

9. The device for welding the steel structure according to claim 7, wherein: one end sliding connection of chuck (133) has first jack catch (138) and second jack catch (139), first jack catch (138) are equipped with two, first jack catch (138) collineation sets up, second jack catch (139) set up same one side at first jack catch (138), second jack catch (139) perpendicular to first jack catch (139) set up, first jack catch (138) and second jack catch (139) all are equipped with two, first jack catch (138) and second jack catch (139) one-to-one, all be equipped with locking bolt (14) on first jack catch (138) and second jack catch (139).

10. The device for welding the steel structure according to claim 9, wherein: the locking bolt (14) penetrates through the first jaw (138) and is in threaded fit with the first jaw (138), and the locking bolt (14) is in rotary connection with the chuck (133).