A steel plate box girder welding system facilitating positioning and clamping

Abstract

The present application relates to the technical field of welding, and discloses a steel plate box girder welding system facilitating positioning and clamping, which comprises a welding system arranged in a control box, and comprises a PLC control system, a support program command module, a positioning program command module and a polishing program command module; the steel plate box girder welding system facilitating positioning and clamping further comprises a welding equipment body used for welding a steel plate box girder body on a T-shaped box girder base, the number of the steel plate box girder body is two groups, and the welding equipment body comprises a welding machine, a circular connecting line and a welding gun; the positioning program command module sends a command during welding. The steel plate box girder welding system facilitating positioning and clamping has the advantages that it is convenient to use, can simply and effectively support the steel plate box girder body during welding, avoids mispositioning, and can perform a synchronous polishing step during welding, thereby improving work efficiency.

Description

Technical Field

[0001] This invention relates to the field of welding technology, and in particular to a welding system for steel plate box girders that is easy to position and clamp. Background Technology

[0002] Box girder bridges are a type of beam in bridge engineering, hollow inside with flanges on both sides of the upper part, resembling a box, hence the name. They are classified as single-box or multi-box. Reinforced concrete box girders are divided into precast box girders and cast-in-place box girders. Box girders precast on an independent site can be erected after the substructure is completed using a bridge erection machine, accelerating the project progress and saving time; cast-in-place box girders are mostly used in large continuous bridges. Currently, they are commonly classified by material into two main types: prestressed reinforced concrete box girders and steel box girders. Prestressed reinforced concrete box girders are constructed on-site, and in addition to longitudinal prestressing, some also have transverse prestressing; steel box girders are generally fabricated in a factory and then transported to the site for installation, some being all-steel structures, while others have a reinforced concrete pavement layer. Steel box girders, also called steel plate box girders, are a commonly used structural form for long-span bridges. They are generally used on bridges with large spans. Their shape resembles a box, hence the name steel box girder.

[0003] However, in the existing technology, the traditional method of welding steel plate box girders is to place the side plates of the box girder on the ground and then weld them at the contact points with the bottom plate of the box girder. During the welding process of the top plate of the box girder, temporary supports are usually used, such as some wooden blocks or iron blocks for internal temporary support. However, during the support process, the temporary support blocks found during welding are inevitably lower than the height of the side plates of the box girder. When welding with the top plate of the box girder, if the support is not in place, the welding is prone to tilting.

[0004] Therefore, the present invention provides a welding system for steel plate box girders that is easy to position and clamp, in order to solve the above-mentioned problems. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a welding system for steel plate box girders that facilitates positioning and clamping.

[0006] This invention is achieved using the following technical solution: A welding system for a steel plate box girder that is easy to position and clamp includes a welding system housed in a control box. The welding system comprises a PLC control system, a support program command module, a positioning program command module, and a grinding program command module. The welding system also includes a welding equipment body for welding the steel plate box girder body on a T-shaped box girder base. The number of steel plate box girder bodies is two sets. The welding equipment body includes a welding machine, a circular connecting line, and a welding torch. During welding, the positioning program command module issues a command to start motor one in the positioning unit, which, after preliminary welding of the box girder bottom plate to one of the box girder side plates, fixes the box girder during the welding of the box girder top plate. During welding, the grinding program command module issues a command to start hydraulic cylinder two in the adjusting unit, controlling the circular polishing plate to perform left-right position grinding during the grinding process. After motor two receives the command, it can control the T-shaped slider, thereby moving the L-shaped driven frame back and forth to achieve front-to-back position polishing of the circular polishing plate. The third motor in the polishing unit polishes and grinds the welded parts of the steel plate box girder after the main body of the steel plate box girder is welded and formed, enabling simultaneous welding and grinding. During welding, the support program command module controls the sensors of the support unit. During the welding process of the steel plate box girder, the sensors contact the top plate of the box girder located above, at which point the welder is prompted to stop rotating the one-way screw. The T-shaped box girder base includes two parts: square stones and trapezoidal stones. The top of the trapezoidal stones has a placement groove, and four liquid... The hydraulic cylinder has a concave support block fixedly installed on its output shaft. The steel plate box girder body includes a box girder bottom plate, two box girder side plates, a box girder top plate, and a trapezoidal connecting plate. A box girder plate positioning device is provided in the placement groove. The box girder plate positioning device includes a rectangular base set in the placement groove. Four universal wheels are installed at the bottom of the rectangular base. A vertical mounting plate is fixedly installed on the top of the rectangular base. A positioning unit, an adjustment unit, a polishing unit, and a support unit are provided on the vertical mounting plate. The control box is fixedly installed on the vertical mounting plate.

[0007] The positioning unit includes a motor mounted on one side of a vertical mounting plate. A threaded rod is fixedly mounted on the output shaft of the motor. A rectangular clamping plate is threaded onto the threaded rod, which penetrates the vertical mounting plate and contacts the top plate of the box girder. An L-shaped mounting seat is rotatably fitted onto the threaded rod, and the L-shaped mounting seat is fixedly mounted on the vertical mounting plate. The motor is fixedly mounted on the L-shaped mounting seat. A first threaded hole is formed at the top of the rectangular clamping plate, and the first threaded hole is threadedly connected to the threaded rod. A square opening is formed at the top of the vertical mounting plate, and the same first fixing rod is fixedly mounted on the top and bottom inner walls of the square opening. The rectangular clamping plate is slidably fitted onto the first fixing rod.

[0008] Through the above technical solution, after receiving the command, the first motor in the positioning unit fixes the initially welded steel plate box girder body through the cooperation of the first threaded rod and the rectangular clamping plate.

[0009] The regulating unit includes an L-shaped driven frame mounted on a vertical mounting plate. A rectangular fixing block is fixedly mounted on the top of the vertical mounting plate. A T-shaped groove is formed on the rectangular fixing block. A threaded rod is rotatably mounted in the T-shaped groove. A T-shaped slider is threaded onto the threaded rod. A hydraulic cylinder is fixedly mounted on one side of the T-shaped slider. The output shaft of the hydraulic cylinder is fixedly connected to the L-shaped driven frame. A motor is fixedly mounted on one side of the rectangular fixing block. The output shaft of the motor extends into the T-shaped groove and is threadedly connected to the threaded rod.

[0010] Through the above technical solution, after receiving the command, the second hydraulic cylinder in the regulating unit is used to drive the L-shaped driven frame to move back and forth, thereby achieving the grinding of the welding position in the left and right directions. After receiving the command, the second motor rotates through the second threaded rod to achieve the grinding of the welding position in the front and back directions.

[0011] The vertical mounting plate has a square opening two, which is slidably connected to the L-shaped driven frame.

[0012] With the above technical solution, the diameter of the square through-hole is relatively large, and its width only allows the L-shaped driven frame to move, but not to rotate.

[0013] The polishing unit includes a motor three mounted above an L-shaped driven frame. A circular sleeve is fixedly mounted on the output shaft of the motor three, and the circular sleeve is rotatably mounted on the L-shaped driven frame. A circular balance bar is slidably mounted on the circular sleeve. A circular polishing plate is fixedly mounted at the bottom end of the circular balance bar. A threaded rod three is rotatably mounted on the circular polishing plate. An internal threaded sleeve one is threaded onto the threaded rod three. The side of the internal threaded sleeve one closest to the circular sleeve is fixedly connected to the circular sleeve.

[0014] As a further improvement to the above solution, a spring is fixedly installed on the top inner wall of the circular sleeve, the bottom end of the spring is fixedly connected to the circular balance bar, a square mounting base is fixedly installed on the top of the L-shaped driven frame, and the motor is fixedly installed on the square mounting base.

[0015] As a further improvement to the above solution, the support unit includes an L-shaped fixing frame fixedly installed on a vertical mounting plate. A U-shaped frame is fixedly installed on the L-shaped fixing frame. A one-way screw is rotatably installed on the U-shaped frame. An internally threaded sleeve is threaded onto the one-way screw. Two hinge rods are hinged to the internally threaded sleeve. A hinge block is hinged to the end of the hinge rod away from the internally threaded sleeve. A trapezoidal top plate is fixedly installed on the hinge block. A sensor is provided inside the trapezoidal top plate. The two trapezoidal top plates are in contact with the bottom plate and the top plate of the box girder, respectively.

[0016] As a further improvement to the above solution, the top and bottom of the U-shaped frame are fixedly installed with C-shaped mounting bases. Circular sliding rods are slidably installed on the C-shaped mounting bases. The two circular sliding rods are fixedly connected to the two trapezoidal top plates respectively. Springs are slidably sleeved on the circular sliding rods. The ends of the two springs that are far apart from each other are fixedly connected to the two trapezoidal top plates respectively, and the ends of the two springs that are close to each other are fixedly connected to the two C-shaped mounting bases respectively.

[0017] To solve the above-mentioned technical problems, the welding system for steel plate box girders that is easy to position and clamp provided by the present invention further includes an adsorption unit. The adsorption unit is set on the U-shaped frame and includes an "H"-shaped mounting bracket set on the U-shaped frame. The "H"-shaped mounting bracket is equipped with a vacuum pump and a regulating valve. A three-way valve is connected to the regulating valve. A first guide pipe and a second guide pipe are respectively connected to the three-way valve. A conical suction cup is fixedly installed on both the first guide pipe and the second guide pipe. Two first positioning blocks are fixedly installed on the "H"-shaped mounting bracket. An L-shaped positioning rod is slidably installed on the first positioning block. The L-shaped positioning rod is fixedly connected to the corresponding conical suction cup.

[0018] As a further improvement to the above solution, a first limiting plate is fixedly sleeved on the L-shaped positioning rod, and a tension spring is slidably sleeved on the L-shaped positioning rod. One end of the tension spring is fixedly connected to the first positioning block, and the other end of the tension spring is fixedly connected to the corresponding first limiting plate. A first screw is provided on the "H"-shaped mounting bracket, and the "H"-shaped mounting bracket is mounted on the U-shaped frame by the first screw.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] 1. A welding system for steel plate box girders that is easy to position and clamp is provided by setting up a positioning unit. The positioning unit can fix the box girder after the bottom plate and one of the side plates of the box girder are initially welded, and then fix the top plate of the box girder during the welding process to avoid displacement during the welding process.

[0021] 2. A welding system for steel plate box girders that is easy to position and clamp is provided by setting up an adjustment unit and a polishing unit. The adjustment unit and the polishing unit work together to polish and grind the welded parts of the steel plate box girder body after the steel plate box girder body is welded and formed. It can achieve simultaneous welding and grinding, and during the grinding process, the circular polishing plate can be moved back and forth by starting the second motor.

[0022] 3. A welding system for steel plate box girders that is easy to position and clamp is provided by setting up a support unit. The support unit can simply and effectively support the top plate of the box girder during the welding process of the steel plate box girder body, avoiding direct welding between the top plate and the side plate of the box girder due to uneven height, thus avoiding waste of steel plate material.

[0023] 4. A welding system for steel plate box girders that is easy to position and clamp is provided by setting up an adsorption unit. The adsorption unit is used to fix the side plate of another box girder before the main body of the steel plate box girder is welded and formed. It can make comparisons during the welding process, detect problems in time, and is easy for the user to operate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the welding system for a steel plate box girder that is easy to position and clamp, provided in the first embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the front sectional view of the present invention;

[0026] Figure 3 for Figure 2 A magnified structural diagram of part A in the middle;

[0027] Figure 4 for Figure 2 A magnified structural diagram of part B in the middle section;

[0028] Figure 5 This is a cross-sectional view of the polishing unit in this invention;

[0029] Figure 6 This is a cross-sectional view of the supporting unit in this invention;

[0030] Figure 7 This is a top sectional view of the U-shaped frame in this invention.

[0031] Figure 8This is a schematic diagram of the overall structure of the welding system for a steel plate box girder that is easy to position and clamp, provided in the second embodiment of the present invention.

[0032] Figure 9 for Figure 8 A magnified structural diagram of section C;

[0033] Figure 10 This is a schematic diagram of the principle of the present invention.

[0034] Explanation of key symbols:

[0035] 100. Welding equipment body; 200. T-shaped box girder seat; 300. Steel plate box girder body; 101. Welding machine; 102. Circular connecting line; 103. Welding torch; 201. Square stone block; 202. Trapezoidal stone block; 203. Placement trough; 204. Hydraulic cylinder one; 205. Concave support block; 301. Box girder bottom plate; 302. Box girder side plate; 303. Box girder top plate; 304. Trapezoidal connecting plate; 4. Support unit; 400. L-shaped fixing frame; 401. U-shaped frame; 402. One-way screw; 403. Internal threaded sleeve two; 404. Hinge rod; 405. Hinge block; 406. Trapezoidal top plate; 407. U-shaped mounting seat; 408. Circular sliding rod; 409. Spring two; 400 1. H-type mounting bracket; 4002. Vacuum pump; 4003. Regulating valve; 4004. Three-way valve; 4005. Guide pipe one; 4006. Guide pipe two; 4007. Conical suction cup; 4008. L-shaped positioning rod; 5. Rectangular base; 6. Vertical mounting plate; 601. Control box; 7. Motor one; 8. Threaded rod one; 9. Rectangular clamping plate; 10. L-shaped driven frame; 11. Rectangular fixing block; 12. T-shaped slide groove; 13. Threaded rod two; 14. T-shaped slider; 15. Hydraulic cylinder two; 16. Motor two; 17. Motor three; 18. Circular sleeve; 19. Circular balance bar; 20. Circular polishing plate; 21. Internal threaded sleeve one; 22. Threaded rod three; 23. Spring one. Detailed Implementation

[0036] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0037] First embodiment:

[0038] Please combine Figure 1-7The welding system for the steel plate box girder, which facilitates positioning and clamping in this embodiment, includes a welding system housed in the control box 601. The welding system comprises a PLC control system, a support program command module, a positioning program command module, and a grinding program command module. The welding system also includes a welding equipment body 100 for welding the steel plate box girder body 300 on the T-shaped box girder seat 200. There are two sets of steel plate box girder bodies 300. The welding equipment body 100 includes a welding machine 101, a circular connecting line 102, and a welding torch 103. During welding, the positioning program command module issues a command... Command: By starting motor 7 in the positioning unit, the box girder bottom plate 301 can be initially welded to one of the box girder side plates 302, and then fixed during the welding of the box girder top plate 303; during welding, the grinding program command module issues a command to start hydraulic cylinder 15 in the adjusting unit to control the circular polishing plate 20 to achieve left and right position grinding during the grinding process, and after motor 16 receives the command, it can control the T-shaped slider 14 to achieve the L-shaped driven frame 10 to move back and forth, realizing the front and back position polishing of the circular polishing plate 20; start motor 1 in the polishing unit 7. After the steel plate box girder body 300 is welded and formed, the welded parts of the steel plate box girder body 300 are polished and ground, enabling simultaneous welding and grinding. During welding, the support program command module controls the sensors of the support unit. During the welding process of the steel plate box girder body 300, the sensors contact the top plate 303 of the box girder above, prompting the welder to stop rotating the one-way screw 402. The T-shaped box girder base 200 includes two parts: square stone blocks 201 and trapezoidal stone blocks 202. The top of the trapezoidal stone blocks 202 has a placement groove 203, and four hydraulic cylinders are fixedly installed on the top of the placement groove 203. 204, the output shaft of hydraulic cylinder 204 is fixedly mounted with a concave support block 205; the steel plate box girder body 300 includes several parts such as box girder bottom plate 301, two box girder side plates 302, box girder top plate 303 and trapezoidal connecting plate 304; a box girder plate positioning device is provided in the placement groove 203; the box girder plate positioning device includes a rectangular base 5 set in the placement groove 203, four universal wheels are installed at the bottom of the rectangular base 5, and a vertical mounting plate 6 is fixedly installed on the top of the rectangular base 5. The vertical mounting plate 6 is equipped with a positioning unit, an adjustment unit, a polishing unit and a support unit 4, and a control box 601 is fixedly installed on the vertical mounting plate 6.

[0039] The positioning unit includes a motor 7 mounted on one side of the vertical mounting plate 6. A threaded rod 8 is fixedly mounted on the output shaft of the motor 7. A rectangular clamping plate 9 is threaded onto the threaded rod 8. The rectangular clamping plate 9 passes through the vertical mounting plate 6 and contacts the top plate 303 of the box girder. An L-shaped mounting seat is rotatably mounted on the threaded rod 8. The L-shaped mounting seat is fixedly mounted on the vertical mounting plate 6. The motor 7 is fixedly mounted on the L-shaped mounting seat. A first threaded hole is opened at the top of the rectangular clamping plate 9. The first threaded hole is threadedly connected to the threaded rod 8. A square opening is opened at the top of the vertical mounting plate 6. The same first fixing rod is fixedly mounted on the top inner wall and bottom inner wall of the square opening. The rectangular clamping plate 9 is slidably mounted on the first fixing rod.

[0040] After receiving a command, the motor 7 in the positioning unit fixes the initially welded steel plate box girder body 300 through the cooperation of the threaded rod 8 and the rectangular clamping plate 9.

[0041] The regulating unit includes an L-shaped driven frame 10 mounted on a vertical mounting plate 6. A rectangular fixing block 11 is fixedly mounted on the top of the vertical mounting plate 6. A T-shaped slide groove 12 is provided on the rectangular fixing block 11. A threaded rod 13 is rotatably mounted in the T-shaped slide groove 12. A T-shaped slider 14 is threadedly fitted on the threaded rod 13. A hydraulic cylinder 15 is fixedly mounted on one side of the T-shaped slider 14. The output shaft of the hydraulic cylinder 15 is fixedly connected to the L-shaped driven frame 10. A motor 16 is fixedly mounted on one side of the rectangular fixing block 11. The output shaft of the motor 16 extends into the T-shaped slide groove 12 and is threadedly connected to the threaded rod 13.

[0042] After receiving a command, hydraulic cylinder 15 in the regulating unit drives the L-shaped driven frame 10 to move back and forth, thereby grinding the welding position in the left and right directions. After receiving a command, motor 16 rotates through threaded rod 13 to grind the welding position in the front and back directions.

[0043] The vertical mounting plate 6 has a square opening 2, which is slidably connected to the L-shaped driven frame 10.

[0044] The diameter of the square opening is relatively large, and its width only allows the L-shaped driven frame 10 to move, but not to rotate;

[0045] The polishing unit includes a motor 17 mounted above an L-shaped driven frame 10. A circular sleeve 18 is fixedly mounted on the output shaft of the motor 17, and the circular sleeve 18 is rotatably mounted on the L-shaped driven frame 10. A circular balance bar 19 is slidably mounted on the circular sleeve 18. A circular polishing plate 20 is fixedly mounted at the bottom end of the circular balance bar 19. A threaded rod 22 is rotatably mounted on the circular polishing plate 20. An internal threaded sleeve 21 is threadedly fitted on the threaded rod 22. The side of the internal threaded sleeve 21 closest to the circular sleeve 18 is fixedly connected to the circular sleeve 18.

[0046] A spring 23 is fixedly installed on the top inner wall of the circular sleeve 18. The bottom end of the spring 23 is fixedly connected to the circular balance bar 19. A square mounting base is fixedly installed on the top of the L-shaped driven frame 10. The motor 17 is fixedly installed on the square mounting base.

[0047] The support unit 4 includes an L-shaped fixing frame 400 fixedly installed on a vertical mounting plate 6. A U-shaped frame 401 is fixedly installed on the L-shaped fixing frame 400. A one-way screw 402 is rotatably installed on the U-shaped frame 401. An internal threaded sleeve 403 is threaded onto the one-way screw 402. Two hinge rods 404 are hinged to the internal threaded sleeve 403. A hinge block 405 is hinged to the end of the hinge rod 404 away from the internal threaded sleeve 403. A trapezoidal top plate 406 is fixedly installed on the hinge block 405. A sensor is provided inside the trapezoidal top plate 406. The two trapezoidal top plates 406 are in contact with the bottom plate 301 and the top plate 303 of the box girder, respectively.

[0048] The top and bottom of the U-shaped frame 401 are fixedly installed with C-shaped mounting bases 407. Circular sliding rods 408 are slidably installed on the C-shaped mounting bases 407. The two circular sliding rods 408 are fixedly connected to the two trapezoidal top plates 406 respectively. Springs 409 are slidably sleeved on the circular sliding rods 408. The ends of the two springs 409 that are far apart from each other are fixedly connected to the two trapezoidal top plates 406 respectively, and the ends of the two springs 409 that are close to each other are fixedly connected to the two C-shaped mounting bases 407 respectively.

[0049] To solve the above-mentioned technical problems, the present invention provides a welding system for steel plate box girders that is easy to position and clamp;

[0050] The implementation principle of a welding system for steel plate box girders that facilitates positioning and clamping in this application embodiment is as follows:

[0051] When it is necessary to weld the unformed steel plate box girder body 300, the bottom plate 301 of the box girder is first preliminarily welded and positioned to one of the box girder side plates 302. Then, the welded bottom plate 301 and side plate 302 of the box girder are placed on the concave support block 205, and then positioned by the box girder plate positioning device. If the height of the bottom plate 301 of the box girder is higher than that of the rectangular base 5, the hydraulic cylinder 204 is directly started. The output shaft of the hydraulic cylinder 204 drives the concave support block 205 to move downward. When the bottom plate 301 of the box girder contacts the rectangular base 5;

[0052] Rotate the one-way screw 402 in the rotating support unit 4. At this time, the one-way screw 402 drives the internal threaded sleeve 403 to rotate. Under the action of the thread, the internal threaded sleeve 403 drives the two hinge rods 404 to move. The hinge rods 404 drive the hinge block 405 to move. The hinge block 405 drives the trapezoidal top plate 406 to move. When the trapezoidal top plate 406 moves to a certain distance, the box girder top plate 303 is placed on the trapezoidal top plate 406. At this time, the initial support is formed.

[0053] Then start motor 7. The output shaft of motor 7 drives threaded rod 8 to rotate. Under the action of the thread, threaded rod 8 drives rectangular clamp 9 to move downward, thereby fixing the top plate 303 of the box girder to the corresponding side plate 302 of the box girder. Welders use welding equipment body 100 to weld the gap between the top plate 303 of the box girder and the side plate 302 of the box girder.

[0054] After welding one end, motor 317 can be started. The output shaft of motor 317 drives the circular sleeve 18 to rotate. Under the combined action of threaded rod 322 and internal threaded sleeve 121, the circular sleeve 18 drives the circular polishing plate 20 to rotate, which can then grind the weld between the box girder side plate 302 and the box girder top plate 303, and grind the protruding parts during welding to make them smooth.

[0055] Furthermore, the height of the circular polishing plate 20 can be adjusted as needed by rotating the threaded rod 22, allowing it to be adjusted downwards even after wear appears at the bottom of the circular polishing plate 20.

[0056] After grinding one end of the circular polishing plate 20, hydraulic cylinder 2 15 can be activated. The output shaft of hydraulic cylinder 2 15 drives the L-shaped driven frame 10 to move to the right, and then the weld on the other side can be ground. If necessary, motor 2 16 can be activated. The output shaft of motor 2 16 drives threaded rod 2 13 to rotate. Under the action of the thread, threaded rod 2 13 drives T-shaped slider 14 to move, so that when the circular polishing plate 20 is ground in the left and right directions, it can also be ground in the front and back directions.

[0057] Second Embodiment

[0058] Based on the welding system for steel plate box girders that is easy to position and clamp provided in the first embodiment of this application, the second embodiment of this application proposes another welding system for steel plate box girders that is easy to position and clamp. The second embodiment is merely a further solution of the first embodiment as a further solution of the present invention, and the implementation of the second embodiment will not affect the separate implementation of the first embodiment.

[0059] The second embodiment of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0060] Please refer to the following: Figures 8-9 In the second embodiment of the present invention, the welding system for the steel plate box girder that is easy to position and clamp also includes an adsorption unit. The adsorption unit is set on the U-shaped frame 401. The adsorption unit includes an "H"-shaped mounting bracket 4001 set on the U-shaped frame 401. A vacuum pump 4002 is set on the "H"-shaped mounting bracket 4001. A regulating valve 4003 is set on the vacuum pump 4002. A three-way valve 4004 is connected to the regulating valve 4003. A first guide pipe 4005 and a second guide pipe 4006 are respectively connected to the three-way valve 4004. A conical suction cup 4007 is fixedly installed on both the first guide pipe 4005 and the second guide pipe 4006. Two first positioning blocks are fixedly installed on the "H"-shaped mounting bracket 4001. An L-shaped positioning rod 4008 is slidably installed on the first positioning block. The L-shaped positioning rod 4008 is fixedly connected to the corresponding conical suction cup 4007.

[0061] A first limiting plate is fixedly sleeved on the L-shaped positioning rod 4008, and a tension spring is slidably sleeved on the L-shaped positioning rod 4008. One end of the tension spring is fixedly connected to the first positioning block, and the other end of the tension spring is fixedly connected to the corresponding first limiting plate. A first screw is provided on the "H"-shaped mounting bracket 4001, and the "H"-shaped mounting bracket 4001 is mounted on the U-shaped frame 401 by the first screw.

[0062] The working principle of the welding system for steel plate box girders that facilitates positioning and clamping provided by this invention is as follows:

[0063] During the welding process between the bottom plate 301 and the side plate 302 of the box girder, if it is necessary to fix another side plate 302 of the box girder, simply install an "H"-shaped mounting bracket 4001 on the U-shaped frame 401, and then bring the conical suction cup 4007 into contact with the side plate 302 of the box girder. At this time, start the vacuum pump 4002. Under the combined action of the first guide pipe 4005 and the second guide pipe 4006, the other side plate 302 of the box girder can be fixed by vacuum suction, which facilitates the subsequent welding process.

[0064] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A welding system for steel plate box girders that facilitates positioning and clamping, characterized in that, It includes a welding system installed in the control box, which consists of a PLC control system, a support program command module, a positioning program command module, and a grinding program command module. The welding system for the steel plate box girder that is easy to position and clamp also includes a welding equipment body for welding the steel plate box girder body on the T-shaped box girder seat. There are two sets of steel plate box girder bodies. The welding equipment body includes a welding machine, a circular connecting line and a welding torch. During welding, the support program command module controls the sensors of the support unit. During the welding of the steel plate box girder body, the sensors come into contact with the top plate of the box girder above. At this time, the welding personnel are prompted to stop rotating the one-way screw. The T-shaped box girder base consists of two parts: square stones and trapezoidal stones. The top of the trapezoidal stones is provided with a placement groove, and four hydraulic cylinders are fixedly installed on the top of the placement groove. The output shaft of each hydraulic cylinder is fixedly installed with a concave support block. The steel plate box girder body consists of several parts, including the box girder bottom plate, two box girder side plates, the box girder top plate, and a trapezoidal connecting plate; the placement groove is equipped with a box girder plate positioning device; The box girder positioning device includes a rectangular base set in a placement groove, four casters installed at the bottom of the rectangular base, a vertical mounting plate fixedly installed on the top of the rectangular base, a positioning unit, an adjustment unit, a polishing unit and a support unit on the vertical mounting plate, and a control box fixedly installed on the vertical mounting plate. The positioning unit includes a motor 1 set on one side of the vertical mounting plate. A threaded rod 1 is fixedly installed on the output shaft of the motor 1. A rectangular clamping plate is threaded onto the threaded rod 1. The rectangular clamping plate passes through the vertical mounting plate and contacts the top plate of the box girder. An L-shaped mounting seat is rotatably sleeved on the threaded rod 1. The L-shaped mounting seat is fixedly installed on the vertical mounting plate. The motor 1 is fixedly installed on the L-shaped mounting seat. A first threaded hole is opened at the top of the rectangular clamping plate. The first threaded hole is threadedly connected to the threaded rod 1. A square opening 1 is opened at the top of the vertical mounting plate. The same first fixing rod is fixedly installed on the top inner wall and bottom inner wall of the square opening 1. The rectangular clamping plate is slidably sleeved on the first fixing rod. During welding, the positioning program command module issues a command to start motor one in the positioning unit, which can fix the box girder after the initial welding of the bottom plate and one of the side plates of the box girder is carried out, and then fix the top plate of the box girder during welding. The regulating unit includes an L-shaped driven frame mounted on a vertical mounting plate. A rectangular fixed block is fixedly mounted on the top of the vertical mounting plate. A T-shaped groove is opened on the rectangular fixed block. A threaded rod is rotatably mounted in the T-shaped groove. A T-shaped slider is threaded on the threaded rod. A hydraulic cylinder is fixedly mounted on one side of the T-shaped slider. The output shaft of the hydraulic cylinder is fixedly connected to the L-shaped driven frame. A motor is fixedly mounted on one side of the rectangular fixed block. The output shaft of the motor extends into the T-shaped groove and is threadedly connected to the threaded rod. During welding, the grinding program command module issues a command to activate the hydraulic cylinder two of the regulating unit, which controls the circular polishing plate to grind in the left and right directions during the grinding process. After receiving the command, the motor two can control the T-shaped slider, which in turn moves the L-shaped driven frame back and forth, thus achieving the back and forth polishing of the circular polishing plate. The vertical mounting plate has a square opening two, which is slidably connected to the L-shaped driven frame. The polishing unit includes a motor three mounted above an L-shaped driven frame. A circular sleeve is fixedly mounted on the output shaft of the motor three and is rotatably mounted on the L-shaped driven frame. A circular balance bar is slidably mounted on the circular sleeve. A circular polishing plate is fixedly mounted at the bottom end of the circular balance bar. A threaded rod three is rotatably mounted on the circular polishing plate. An internal threaded sleeve one is threaded onto the threaded rod three. The side of the internal threaded sleeve one closest to the circular sleeve is fixedly connected to the circular sleeve. Start motor three in the polishing unit to polish and grind the welded parts of the steel plate box girder body after the steel plate box girder body is welded and formed. This can achieve simultaneous welding and grinding, realizing synchronous operation. A spring is fixedly installed on the top inner wall of the circular sleeve. The bottom end of the spring is fixedly connected to the circular balance bar. A square mounting base is fixedly installed on the top of the L-shaped driven frame. Motor 3 is fixedly installed on the square mounting base. The support unit includes an L-shaped fixed frame fixedly mounted on a vertical mounting plate. A U-shaped frame is fixedly mounted on the L-shaped fixed frame. A one-way screw is rotatably mounted on the U-shaped frame. An internally threaded sleeve is threaded onto the one-way screw. Two hinge rods are hinged to the internally threaded sleeve. A hinge block is hinged to the end of the hinge rod away from the internally threaded sleeve. A trapezoidal top plate is fixedly mounted on the hinge block. A sensor is installed inside the trapezoidal top plate. The two trapezoidal top plates are in contact with the bottom plate and the top plate of the box girder, respectively. The top and bottom of the U-shaped frame are fixedly installed with C-shaped mounting bases. Circular sliding rods are slidably installed on the C-shaped mounting bases. The two circular sliding rods are fixedly connected to the two trapezoidal top plates respectively. Springs are slidably sleeved on the circular sliding rods. The ends of the two springs that are far apart from each other are fixedly connected to the two trapezoidal top plates respectively, and the ends of the two springs that are close to each other are fixedly connected to the two C-shaped mounting bases respectively.

2. The welding system for steel plate box girders that facilitates positioning and clamping as described in claim 1, characterized in that, An adsorption unit is installed on the U-shaped frame. The adsorption unit includes an "H"-shaped mounting bracket installed on the U-shaped frame. A vacuum pump is installed on the "H"-shaped mounting bracket. A regulating valve is installed on the vacuum pump. A three-way valve is connected to the regulating valve. A guide pipe 1 and a guide pipe 2 are connected to the three-way valve respectively. A conical suction cup is fixedly installed on both the guide pipe 1 and the guide pipe 2. Two first positioning blocks are fixedly installed on the "H"-shaped mounting bracket. An L-shaped positioning rod is slidably installed on the first positioning block. The L-shaped positioning rod is fixedly connected to the corresponding conical suction cup.

3. The welding system for steel plate box girders that facilitates positioning and clamping as described in claim 1, characterized in that, A first limiting plate is fixedly sleeved on the L-shaped positioning rod, and a tension spring is slidably sleeved on the L-shaped positioning rod. One end of the tension spring is fixedly connected to the first positioning block, and the other end of the tension spring is fixedly connected to the corresponding first limiting plate. A first screw is provided on the "H"-shaped mounting bracket, and the "H"-shaped mounting bracket is installed on the U-shaped frame by the first screw.

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