Auxiliary positioning device for steel box girder construction welding

Abstract

The present application belongs to the technical field of steel box girder welding construction, and particularly relates to an auxiliary positioning device for steel box girder construction welding, which comprises a fixed base and a movable base, the fixed base is detachably installed on the fixed steel box girder, the movable base is detachably installed on the steel box girder to be fixed, one side of the fixed base is provided with a controller, and further comprises a support seat fixedly installed on the side wall of the fixed base away from the movable base, and the support seat is provided with a winding unit. The present application can improve the convenience and stability of the primary positioning of the steel box girder to be welded, reduce the operation difficulty, improve the overall efficiency, and can perform secondary accurate positioning on the steel box girder after the primary positioning, realize rapid butt joint positioning, simultaneously adsorb the welding fume to reduce its influence on welding, detect the abrasion amount of the conical positioning part, timely remind replacement, and guarantee the positioning accuracy.

Description

Technical Field

[0001] This invention belongs to the field of steel box girder welding construction technology, and in particular relates to an auxiliary positioning device for steel box girder welding construction. Background Technology

[0002] During the construction of long-span steel box girders, the steel box girders are generally divided into multiple sections for easy transportation, and then butt welded on site to form an integral structure. During the butt welding process, hoisting deviations can easily lead to misalignment and gaps exceeding tolerances, affecting the weld strength and structural safety. Positioning auxiliary devices can accurately control the butt welding precision, reduce welding stress and deformation, and ensure weld quality. This is a key technology for butt welding of steel box girders.

[0003] For example, the steel box girder welding auxiliary tool disclosed in patent publication number CN217193533U is an auxiliary device for assisting in the welding of steel box girders. It is mainly used to fix the steel box girders after the butt joint is completed to prevent the steel box girder from loosening. However, before welding, the steel box girder needs to be hoisted to the area around the butt joint position by hoisting equipment. Then, the two steel box girders are initially positioned by positioning pins, and then precisely positioned by a hydraulic system. First, it is still difficult to hoist the steel box girder to the area that can be positioned by positioning pins, and it requires constant adjustment. In addition, the swaying during hoisting makes the entire construction difficult. Second, after the initial positioning, a hydraulic system needs to be installed at high altitude for secondary positioning. The operation is relatively cumbersome and affects the overall efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the above-mentioned problems by providing an auxiliary positioning device for welding steel box girders during construction.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an auxiliary positioning device for welding steel box girders, comprising a fixed base and a movable base, wherein the fixed base is detachably installed on a fixed steel box girder, and the movable base is detachably installed on a steel box girder to be fixed; a controller is provided on one side of the fixed base; and the device further comprises: A support base is fixedly installed on the side wall of the fixed base away from the movable base. The support base is equipped with a winding unit, which is used to wind up two steel ropes. A side plate is fixedly installed on the top of the movable base, and two traction ropes that are detachably connected to the steel rope are fixedly installed on the side wall of the side plate. An offset detection unit is installed on the side wall of the support base to detect the offset direction of the two steel ropes; The secondary positioning unit is installed on the side wall of the fixed base and is used for secondary positioning and fixing of the steel box girder.

[0006] Preferably, the winding unit includes two mounting holes on the side wall of the support base, and a winding wheel is rotatably disposed inside each of the two mounting holes. The two winding wheels are connected in a transmission manner. A drive motor is fixedly mounted on the side wall of the support base, and the drive motor is used to drive the winding wheel on the same side to rotate. The drive motor is electrically connected to the controller.

[0007] Preferably, the offset detection unit includes a fixing plate fixedly installed on the side wall of the support base, and both fixing plates are located on one side of the mounting hole on the same side. Both steel ropes slide through the side wall of the fixing plate on the same side. Both steel ropes are fitted with mounting sleeves on their outer sides, and both mounting sleeves are fixedly installed on the side wall of the fixing plate on the same side. Multiple evenly distributed pressure sensors are fixedly installed on the inner walls of the two mounting sleeves, and each pressure sensor has an arc-shaped pressure plate installed at its pressure measuring end. Multiple arc-shaped pressure plates on the same side are fitted on the outer side of the steel rope, and each pressure sensor is electrically connected to the controller.

[0008] Preferably, the secondary positioning unit includes a gantry frame rotatably mounted on the side wall of the fixed base. Two jacks are fixedly inserted into the top of the gantry frame, and pressure detectors are fixedly installed on the movable ends of the two jacks. Each pressure detector has a pressure plate installed on its pressure measuring end. The jacks and pressure detectors are electrically connected to the controller. A guide assembly is installed on the side wall of the side plate, and a locking assembly is installed on the inner wall of the gantry frame.

[0009] Preferably, the guide assembly includes a set of support columns fixedly installed on the side wall of the side plate, and each support column is fixedly connected to a detachable conical positioning head at the end away from the side plate. A detachable positioning platform is fixedly installed on the top of the fixed base, and the side wall of the positioning platform has two conical positioning holes that match the conical positioning heads.

[0010] Preferably, the locking assembly includes locking blocks fixedly installed on two inner walls of the gantry frame, and the end faces of the two locking blocks are threaded with locking screws. The top of the fixed base and the side wall near the movable base are provided with threaded holes that match the locking screws.

[0011] Preferably, the side wall of the support base has an installation groove, and an air pump is fixedly installed inside the installation groove. The side wall of the fixed base has a strip cavity, and the side wall of the strip cavity has multiple air intake holes. The air intake end of the air pump is connected to the inside of the strip cavity. The output end of the air pump is equipped with a wear detection component, which is used to detect the wear of the conical positioning hole and the conical positioning head. The air pump is electrically connected to the controller.

[0012] Preferably, the wear detection component includes an air outlet bend fixedly inserted into the wall of the mounting slot, and the air outlet bend is connected to the air delivery end of the air pump. Two sealing covers are fixedly installed on the side wall of the positioning platform, and two conical positioning holes are connected to the sealing covers on the same side. Two diverter pipes are fixedly inserted into the wall of the air outlet bend, and the two diverter pipes are connected to the corresponding sealing covers. A normally closed solenoid valve is fixedly installed inside each of the two diverter pipes. A normally open solenoid valve is fixedly installed above the air inlet end of the two diverter pipes on the air outlet bend. A pressure switch is fixedly installed inside each of the two sealing covers. The normally closed solenoid valve, the normally open solenoid valve, and the pressure switch are all electrically connected to the controller.

[0013] Compared with existing technologies, the advantages of an auxiliary positioning device for welding steel box girders are: 1. By coordinating the fixed base, movable base, controller, support base, winding unit, steel rope, side plate, traction rope and offset detection unit, the traction method can not only improve the convenience of the initial positioning of the steel box girder to be welded, but also improve the stability of the steel box girder in the initial positioning process, reduce the difficulty of operation, eliminate the need for secondary equipment installation, reduce time waste and improve overall efficiency.

[0014] 2. By setting up a secondary positioning unit, the steel box girder can be precisely positioned in the secondary stage after the primary positioning is completed, so that the steel box girder can quickly complete the docking action and facilitate precise welding.

[0015] 3. Through the coordinated use of the air pump, strip cavity, and air intake, welding fumes during the welding process can be easily adsorbed and discharged, minimizing their impact on the welding process. Furthermore, the wear detection component can detect the wear of the conical positioning hole and conical positioning head, alerting personnel to replace them promptly when excessive wear occurs, preventing excessive wear from affecting the accuracy of steel box girder positioning. Moreover, the device can be installed before hoisting, eliminating the need for high-altitude installation and making it convenient to use. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of an auxiliary positioning device for welding steel box girders provided by the present invention; Figure 2 This is a top view schematic diagram of an auxiliary positioning device for welding steel box girders provided by the present invention; Figure 3 This is a schematic diagram of the initial connection structure between the gantry and the fixed base of an auxiliary positioning device for welding steel box girder construction provided by the present invention; Figure 4 This is a schematic diagram of the initial structure of the movable base and traction rope of an auxiliary positioning device for welding steel box girder construction provided by the present invention. Figure 5 This invention provides an auxiliary positioning device for welding steel box girders during construction. Figure 2 Enlarged view of the structure of section A; Figure 6 This is a side view of the mounting sleeve of an auxiliary positioning device for welding steel box girder construction provided by the present invention; Figure 7 This is a schematic diagram of the internal structure of the mounting groove of an auxiliary positioning device for welding steel box girder construction provided by the present invention; Figure 8 This is a top view of the positioning platform of an auxiliary positioning device for welding steel box girder construction provided by the present invention. Figure 9 This is a schematic diagram of the structure of a steel box girder after the welding of an auxiliary positioning device for steel box girder construction provided by the present invention.

[0017] In the diagram: 1 Fixed base, 2 Movable base, 3 Controller, 4 Support base, 5 Winding unit, 51 Mounting hole, 52 Winding wheel, 53 Drive motor, 6 Steel rope, 7 Side plate, 8 Traction rope, 9 Offset detection unit, 91 Fixed plate, 92 Mounting sleeve, 93 Pressure sensor, 94 Arc-shaped pressure plate, 10 Secondary positioning unit, 101 Gantry, 102 Jack, 103 Pressure detector, 104 Top pressure plate, 11 Guide assembly, 111 Support column, 112 Conical positioning head, 113 Positioning platform, 114 Conical positioning hole, 12 Locking assembly, 121 Locking block, 122 Locking screw, 13 Mounting groove, 14 Air pump, 15 Strip cavity, 16 Suction hole, 17 Wear detection assembly, 171 Exhaust bend, 172 Sealing cover, 173 Diverter pipe, 174 Normally closed solenoid valve, 175 Normally open solenoid valve, 176 Pneumatic switch. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] like Figures 1-9As shown, an auxiliary positioning device for welding steel box girders includes a fixed base 1 and a movable base 2. The fixed base 1 is detachably installed on the fixed steel box girder, and the movable base 2 is detachably installed on the steel box girder to be fixed. A controller 3 is provided on one side of the fixed base 1. The device also includes a support base 4, which is fixedly installed on the side wall of the fixed base 1 away from the movable base 2. The support base 4 is equipped with a winding unit 5, which is used to wind up two steel ropes 6. The winding unit 5 includes two mounting holes 51 opened in the side wall of the support base 4. A winding wheel 52 is rotatably installed inside each of the two mounting holes 51, and the two winding wheels 52 are connected in a transmission manner. A drive motor 53 is fixedly installed on the side wall of the support base 4, and the drive motor 53 is used to drive the winding wheel 52 on the same side to rotate. The drive motor 53 is electrically connected to the controller 3. An encoder is provided at the output end of the drive motor 53, which can measure the winding length of the steel ropes 6. After the winding length reaches the set value, the encoder will immediately send an electrical signal back to the controller 3.

[0020] Side plate 7 is fixedly installed on the top of movable base 2. Two traction ropes 8, detachably connected to steel ropes 6, are fixedly installed on the side wall of side plate 7. Offset detection unit 9 is installed on the side wall of support base 4 to detect the offset direction of the two steel ropes 6. Offset detection unit 9 includes a fixing plate 91 fixedly installed on the side wall of support base 4. Both fixing plates 91 are located on one side of the mounting hole 51 on the same side. Both steel ropes 6 slide through the side wall of the fixing plate 91 on the same side. Both steel ropes 6 are fitted with mounting sleeves 92 on the outer side. Both mounting sleeves 92 are fixedly installed on the side wall of the fixing plate 91 on the same side. Multiple evenly distributed pressure sensors 93 are fixedly installed on the inner wall of the two mounting sleeves 92. Each pressure sensor 93 has an arc-shaped pressure plate 94 installed at its pressure measuring end. Multiple arc-shaped pressure plates 94 on the same side are fitted on the outer side of the steel ropes 6. Each pressure sensor 93 is electrically connected to controller 3. Multiple balls are provided on the inner arc surface of the arc-shaped pressure plate 94 to reduce friction loss between it and the steel ropes 6.

[0021] The secondary positioning unit 10 is installed on the side wall of the fixed base 1 for secondary positioning and fixing of the steel box girder. The secondary positioning unit 10 includes a gantry frame 101 rotatably mounted on the side wall of the fixed base 1. Two jacks 102 are fixedly inserted into the top of the gantry frame 101, and pressure detectors 103 are fixedly installed on the movable ends of the two jacks 102. Each pressure detector 103 has a pressure plate 104 installed on its pressure measuring end. The jacks 102 and pressure detectors 103 are electrically connected to the controller 3. The side wall of the side plate 7 is installed with... There is a guide assembly 11, which includes a set of support columns 111 fixedly installed on the side wall of the side plate 7. Each support column 111 is fixedly connected to a detachable conical positioning head 112 at the end away from the side plate 7. A detachable positioning platform 113 is fixedly installed on the top of the fixed base 1. The side wall of the positioning platform 113 has two conical positioning holes 114 that match the conical positioning head 112. The conical slope of the conical positioning hole 114 will force the conical positioning head 112 to move towards the central axis of the hole, forming an automatic centering effect.

[0022] The inner wall of the gantry frame 101 is equipped with a locking assembly 12. The locking assembly 12 includes locking blocks 121 fixedly installed on the two inner walls of the gantry frame 101. The end faces of the two locking blocks 121 are threadedly connected to locking screws 122. The top of the fixed base 1 and the side wall near the movable base 2 are provided with threaded holes that match the locking screws 122. When the gantry frame 101 is in a vertical state, the gantry frame 101 can be fixed by the locking screws 122 and the threaded holes on the top of the fixed base 1. After the gantry frame 101 is rotated 90°, the gantry frame 101 can also be fixed by the locking screws 122.

[0023] The support base 4 has a mounting groove 13 on its side wall, and an air pump 14 is fixedly installed inside the mounting groove 13. The fixed base 1 has a strip cavity 15 on its side wall, and the side wall of the strip cavity 15 has multiple air intake holes 16. The air intake end of the air pump 14 is connected to the inside of the strip cavity 15. The output end of the air pump 14 is equipped with a wear detection component 17, which is used to detect the wear of the conical positioning hole 114 and the conical positioning head 112. The air pump 14 is electrically connected to the controller 3. The wear detection component 17 includes an air outlet bend 171 fixedly inserted into the groove wall of the mounting groove 13, and the air outlet bend 171 is connected to the air supply end of the air pump 14. The side wall of the positioning table 113 is fixedly equipped with two sealing covers 172, and the two conical positioning holes... 114 are all connected to the sealing cover 172 on the same side. Two diversion pipes 173 are fixedly inserted into the wall of the outlet bend 171, and both diversion pipes 173 are connected to the corresponding sealing cover 172. A normally closed solenoid valve 174 is fixedly installed inside the two diversion pipes 173. A normally open solenoid valve 175 is fixedly installed above the air inlet end of the two diversion pipes 173 on the outlet bend 171. A pressure switch 176 is fixedly installed inside the two sealing covers 172. The normally closed solenoid valve 174, the normally open solenoid valve 175 and the pressure switch 176 are all electrically connected to the controller 3. Under the action of increased air pressure, the moving contact of the pressure switch 176 will gradually retract until it closes, and the pressure switch 176 will send an electrical signal back to the controller 3 after it closes.

[0024] The operating principle of the present invention is explained as follows: The fixed base 1 is installed on the fixed steel box girder, and then the movable base 2 is installed on the steel box girder to be welded. Subsequently, the steel box girder to be welded is hoisted to the vicinity of the fixed steel box girder by hoisting equipment. At the fixed steel box girder, the workers use tools to connect the two traction ropes 8 to the corresponding steel ropes 6 (the tools include a handheld long rod and a permanent magnet. The permanent magnet is moved to the end of the traction rope 8 by the handheld long rod, and the traction rope 8 is attracted by magnetic attraction. Then the traction rope 8 is pulled to the steel rope 6. The tool can also be a rod with a hook at one end, and the traction rope 8 is hooked up by the hook). Subsequently, the controller 3 is activated. Initially, the height of the steel box girder to be welded is higher than that of the already fixed steel box girder. Therefore, the steel rope 6 and the traction rope 8 are inclined upwards. At this time, the arc-shaped pressure plate 94 on the upper side of the installation sleeve 92 will be squeezed by the steel rope 6. At this time, the pressure sensor 93 on the upper side will detect the pressure transmitted through the arc-shaped pressure plate 94. The pressure sensor 93 will immediately feed back an electrical signal to the controller 3. The controller 3 will then immediately feed back the corresponding directional information to the handheld terminal device (the handheld terminal can be a mobile phone, remote control, etc.). For example, when the height of the steel box girder to be welded is higher than that of the already fixed steel box girder, the controller 3 will feed back information that the offset direction is upward to the handheld terminal. At this time, the operator of the hoisting equipment can control the hoisting equipment to move the steel box girder to be welded downwards until the electrical signal fed back to the controller 3 by the upper pressure sensor 93 disappears. Then the downward movement of the steel box girder to be welded can be stopped. Simultaneously, after the controller 3 is activated, it controls the drive motor 53 to operate, which in turn drives the two winding wheels 52 to rotate, thereby winding up the two steel ropes 6. During this process, similar to the aforementioned process, when the steel box girder to be welded shifts to one side, the pressure sensor 93 on the corresponding side sends an electrical signal to the controller 3. The controller 3 then sends the corresponding information to the handheld terminal, allowing the operator to manipulate the hoisting equipment to perform appropriate actions to prevent the steel box girder from shifting during hoisting. Furthermore, due to the pulling action of the steel ropes 6 and the traction rope 8, the steel box girder is hoisted... The process is less prone to shaking, which improves the stability of the hoisting. As the steel rope 6 is wound up, the steel box girder to be welded gradually approaches the already fixed steel box girder. When the drive motor 53 has 1 meter left to wound up the steel rope 6 (which indicates that the initial positioning of the steel box girder to be welded is completed), the controller 3 will control the drive motor 53 to stop working and send a prompt message to the staff (the output end of the drive motor 53 is equipped with an encoder, which can measure the winding length of the steel rope 6. After the winding length reaches the set value, the encoder will immediately send an electrical signal back to the controller 3). After receiving the prompt from controller 3, the operator unscrews the locking screw 122 and rotates the gantry 101 90° toward the movable base 2. Then, the locking screw 122 is used to re-secure the gantry 101 to the fixed base 1. Since the steel box girder to be welded is now very close to the already fixed steel box girder, the movable base 2 is positioned inside the gantry 101. The operator then presses the confirm button on controller 3, which controls the two jacks 102 to operate. Under the action of the jacks 102, the pressure plate 104 abuts against the side wall of the movable base 2, pushing the steel box girder to be welded toward the already welded steel box girder, thereby causing the conical positioning head 112 to... Entering the conical positioning hole 114 on the same side, under the action of the conical positioning head 112 and the conical surface of the conical positioning hole 114, the two steel box girders can be driven to accurately align (the conical surface slope of the conical positioning hole 114 will force the conical positioning head 112 to move towards the central axis of the hole, forming an automatic alignment effect). After the two steel box girders are aligned, the pressure applied by the jack 102 to the pressure detector 103 gradually increases. After the pressure reaches the threshold (this pressure can be set based on the alignment pressure that needs to be maintained during the welding of the steel box girders), the pressure detector 103 will send an electrical signal to the controller 3. The controller 3 will immediately control the jack 102 to stop working. Then the controller 3 will issue a voice prompt to remind the staff to start the welding work. Then, the staff can start welding at the joint of the two steel box girders. Before welding, the staff can press the welding button on the controller 3. At this time, the controller 3 will control the air pump 14 to start working. The air pump 14 draws in the fumes generated during external welding through the strip cavity 15 and each air intake hole 16, and discharges them away from the welding position through the exhaust bend 171. This can minimize the impact of welding fumes on the staff's vision and help improve the welding quality. After welding, before removing the fixed base 1 and movable base 2, the operator can activate the detection button. At this time, the controller 3 will control the air pump 14 to operate and open the normally closed solenoid valve 174 and close the normally open solenoid valve 175. The air pumped by the air pump 14 will enter the two sealing covers 172 through the outlet bend 171 and the two diverter pipes 173. As more air accumulates inside the sealing cover 172, the internal air pressure increases. Under this pressure, the moving contacts of the two air pressure switches 176 will be squeezed closed. The controller 3 will receive the closing electrical signal from the air pressure switches 176 and begin timing. Simultaneously, the controller will close the two normally closed solenoid valves 174 and stop the air pump 14. When the conical positioning head 112 and the conical positioning hole 114 are not excessively worn, the conical surfaces of the conical positioning head 112 and the conical positioning hole 114 maintain good sealing under the wedge-tightening effect. Therefore, the air inside the sealing cover 172 cannot escape, or escapes slowly. When the controller 3 counts for 6 seconds, the air pressure switch 176 remains closed, indicating that the conical positioning head 112 and the conical positioning hole 114 are not excessively worn and do not need to be replaced. Conversely, when the conical positioning hole 114 or the conical positioning head 112 is excessively worn, the airflow escapes from the conical positioning hole 114 at a faster speed. At this time, the duration of the feedback electrical signal from the air pressure switch 176 cannot reach 6 seconds, so the conical positioning head 112 and the positioning platform 113 need to be replaced to avoid the conical positioning head 112 and the conical positioning hole 114 affecting the positioning accuracy due to wear. After the steel box girder is butt welded, the movable base 2 and the fixed base 1 can be removed from the steel box girder for easy recycling. Before hoisting a single steel box girder, the movable base 2 and the fixed base 1 can be installed in advance. The movable base 2 is installed at the end to be welded, and the fixed base 1 is installed at the other end.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An auxiliary positioning device for welding steel box girders during construction, comprising a fixed base (1) and a movable base (2), wherein the fixed base (1) is detachably installed on a fixed steel box girder, and the movable base (2) is detachably installed on a steel box girder to be fixed, and a controller (3) is provided on one side of the fixed base (1), characterized in that, Also includes: The support base (4) is fixedly installed on the side wall of the fixed base (1) away from the movable base (2). The support base (4) is equipped with a winding unit (5), and the winding unit (5) is used to wind up two steel ropes (6). Side plate (7) is fixedly installed on the top of the movable base (2), and two traction ropes (8) that are detachably connected to the steel rope (6) are fixedly installed on the side wall of the side plate (7). Offset detection unit (9) is installed on the side wall of the support (4) to detect the offset direction of the two steel ropes (6); A secondary positioning unit (10) is installed on the side wall of the fixed base (1) for secondary positioning and fixing of the steel box girder; The secondary positioning unit (10) includes a gantry frame (101) rotatably mounted on the side wall of the fixed base (1). Two jacks (102) are fixedly inserted into the top of the gantry frame (101), and pressure detectors (103) are fixedly installed on the movable ends of the two jacks (102). The pressure measuring ends of the two pressure detectors (103) are all equipped with top pressure plates (104). The jacks (102) and pressure detectors (103) are electrically connected to the controller (3). A guide assembly (11) is installed on the side wall of the side plate (7), and a locking assembly (12) is installed on the inner wall of the gantry frame (101). The guide assembly (11) includes a set of support columns (111) fixedly installed on the side wall of the side plate (7), and each support column (111) is fixedly connected to a detachable conical positioning head (112) at the end away from the side plate (7). The top of the fixed base (1) is fixedly installed with a detachable positioning platform (113), and the side wall of the positioning platform (113) has two conical positioning holes (114) that match the conical positioning head (112). The support base (4) has an installation groove (13) on its side wall, and an air pump (14) is fixedly installed inside the installation groove (13). The fixed base (1) has a strip cavity (15) on its side wall, and a plurality of air intake holes (16) are provided on the side wall of the strip cavity (15). The air intake end of the air pump (14) is connected to the inside of the strip cavity (15). The output end of the air pump (14) is equipped with a wear detection component (17). The wear detection component (17) is used to detect the wear of the conical positioning hole (114) and the conical positioning head (112). The air pump (14) is electrically connected to the controller (3). The wear detection assembly (17) includes an air outlet bend (171) fixedly inserted into the wall of the mounting groove (13), and the air outlet bend (171) is connected to the air supply end of the air pump (14). Two sealing covers (172) are fixedly installed on the side wall of the positioning platform (113), and the two conical positioning holes (114) are connected to the sealing cover (172) on the same side. Two diverter pipes (173) are fixedly inserted into the wall of the air outlet bend (171), and the two diverter pipes (173) are connected to the corresponding The sealing cover (172) is connected, and normally closed solenoid valves (174) are fixedly installed inside the two diversion pipes (173). The outlet bend (171) is fixedly installed with normally open solenoid valves (175) above the inlet end of the two diversion pipes (173). A pressure switch (176) is fixedly installed inside the two sealing covers (172). The normally closed solenoid valves (174), normally open solenoid valves (175) and pressure switches (176) are all electrically connected to the controller (3).

2. The auxiliary positioning device for welding steel box girders according to claim 1, characterized in that, The winding unit (5) includes two mounting holes (51) on the side wall of the support base (4). A winding wheel (52) is rotatably installed inside each of the two mounting holes (51), and the two winding wheels (52) are connected in a transmission. A drive motor (53) is fixedly installed on the side wall of the support base (4), and the drive motor (53) is used to drive the winding wheel (52) on the same side to rotate. The drive motor (53) is electrically connected to the controller (3).

3. The auxiliary positioning device for welding steel box girders according to claim 2, characterized in that, The offset detection unit (9) includes a fixing plate (91) fixedly installed on the side wall of the support base (4), and both fixing plates (91) are located on one side of the mounting hole (51) on the same side. Both steel ropes (6) slide through the side wall of the fixing plate (91) on the same side. Both steel ropes (6) are fitted with mounting sleeves (92) on the outside of the two steel ropes (6), and both mounting sleeves (92) are fixedly installed on the side wall of the fixing plate (91) on the same side. Multiple pressure sensors (93) are fixedly installed on the inner wall of the two mounting sleeves (92), and each pressure sensor (93) has an arc-shaped pressure plate (94) installed at its pressure measuring end. Multiple arc-shaped pressure plates (94) on the same side are fitted on the outside of the steel rope (6), and each pressure sensor (93) is electrically connected to the controller (3).

4. The auxiliary positioning device for welding steel box girder construction according to claim 1, characterized in that, The locking assembly (12) includes two locking blocks (121) fixedly installed on the inner walls of the gantry (101). The end faces of the two locking blocks (121) are threaded with locking screws (122). The top of the fixed base (1) and the side wall near the movable base (2) are provided with threaded holes that match the locking screws (122).

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