A large-diameter water supply pipeline anti-deformation welding device and method

Abstract

The present invention relates to the technical field of pipeline welding, and particularly to a large-diameter water supply pipeline anti-deformation welding device and method. The welding device further includes a plurality of arc-shaped supports, a limiting mechanism, and a straightening mechanism. By the mutual cooperation of the welding mechanism, the limiting mechanism, and the straightening mechanism provided in the present invention, the anti-deformation welding of the large-diameter water supply pipeline is completed by using an integrated assembly model of welding, limiting, and straightening. Through precise limiting and straightening, the axis alignment and shape regularity of the large-diameter water supply pipeline are ensured, the deformation and stress concentration during the welding process are reduced, and the welding quality and weld strength are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline welding, and in particular to an anti-deformation welding device and method for large-diameter water supply pipelines. Background Technique

[0002] Large-diameter water supply pipelines are usually used to transport a large amount of water or other liquids; because they can withstand high internal pressures to ensure the stability and safety of the water flow during long-distance transportation, they are commonly used in large-scale water conservancy projects. However, during the construction process of water conservancy projects, large-diameter water supply pipelines need to be transported to their corresponding positions one by one and then welded at the connection positions. The large-diameter water supply pipes will be slightly deformed during the stacking in the factory, the hoisting process, and the long-distance transportation process. Therefore, before welding the large-diameter water supply pipes, it is necessary to first shape the connection parts, and then weld the connection parts to ensure higher butt accuracy at the pipe connection, reduce welding defects, so that the large-diameter water supply pipelines can withstand greater internal pressure and external forces, providing guarantee for subsequent water conservancy transportation.

[0003] At present, there are the following disadvantages when welding large-diameter water supply pipelines: 1. Before welding adjacent water supply pipelines, workers need to first push the hydraulic cylinder into the water supply pipeline and use the thrust of the hydraulic cylinder to extrude and straighten its inner wall. However, it is difficult to accurately control the position of the hydraulic cylinder during the pushing process, resulting in uneven thrust and inaccurate extrusion parts, which affect the straightening effect. Moreover, when straightening the deformation, only a single-direction hydraulic push is used, so that the other side will be deformed by the reverse extrusion, thus affecting the overall shape and performance of the pipeline; 2. When welding adjacent water supply pipelines, multiple sets of positioning components need to be used in cooperation to complete the positioning of adjacent water supply pipelines. Each part of the positioning components needs to be adjusted separately, increasing the operation difficulty and positioning time. Moreover, during welding, the adjacent water supply pipelines are not kept in position and supported, resulting in the pipelines being prone to move during the welding process, reducing the welding quality and affecting the overall performance and long-term operation reliability of the pipelines. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides an anti-deformation welding device and method for large-diameter water supply pipelines, which are achieved by the following specific technical means: An anti-deformation welding device for large-diameter water supply pipelines includes a welding mechanism for performing circumferential welding on the connection parts of adjacent large-diameter water supply pipelines. The welding device also includes a plurality of arc-shaped supports, a limiting mechanism, and a straightening mechanism; the plurality of arc-shaped supports are spliced to form a support ring, and the outer ring walls of the relative ends of adjacent large-diameter water supply pipelines are fixedly sleeved on the support ring.

[0005] A limiting slideway that mates with its arc surface is welded to the outer wall of the arc-shaped support. Multiple limiting slideways on the support ring form an annular slideway that mates with the welding mechanism. The welding mechanism includes a splicing and locking part arranged on the arc-shaped support for locking the spliced support ring, as well as a driving component and a welding component.

[0006] The limiting mechanism includes a supporting part and a limiting part arranged on the support ring. The supporting part includes several supporting vertical plates arranged on the opposite sides of adjacent support rings and evenly distributed circumferentially. An assembly frame is jointly arranged between several supporting vertical plates corresponding to the same support ring. The assembly frame is a hexagonal structure composed of multiple reinforcing plates spliced together.

[0007] The limiting part includes a positioning screw rod penetrating between the opposite top angles of the front and rear two assembly frames. The left and right two assembly frames and the positioning screw rod form a stable support structure of a hexagonal frame to position and limit adjacent pipes.

[0008] The orthopedic mechanism includes a supporting disc, a centering part, and an extrusion part for performing two-way synchronous extrusion and orthopedics on the inner wall of a large-diameter water supply pipe. The centering part cooperates with the hexagonal frame to make the supporting disc coaxial with the pipe, ensuring the accurate position of the orthopedic mechanism.

[0009] As a preferred technical solution of the present invention, the splicing and locking part includes a mating slot opened at one end of the arc-shaped support and symmetric about the corresponding limiting slideway on the left and right. An arc-shaped clamping plate corresponding to the mating slot is fixedly installed at the other end of the arc-shaped support. Adjacent arc-shaped supports are assembled by clamping the mating slot with the arc-shaped clamping plate.

[0010] As a preferred technical solution of the present invention, a first screw hole is penetrated through both the mating slot and the arc-shaped clamping plate. A first bolt is commonly threadedly connected between the arc-shaped clamping plate and the mating slot in a clamped fit through the first screw hole.

[0011] As a preferred technical solution of the present invention, the arc-shaped support and the corresponding supporting vertical plate are fixed by bolts. A positioning block that fits with the outer wall of the arc-shaped support is fixedly installed on one side wall of the supporting vertical plate close to the corresponding arc-shaped support.

[0012] As a preferred technical solution of the present invention, sliding sleeves are fixedly penetrated through the mutually remote ends of the supporting vertical plates corresponding to the same support ring. The adjacent reinforcing plates forming the assembly frame are mutually clamped. A first sliding hole is opened at the clamping end of the reinforcing plate. The first sliding hole is movably connected to both the positioning screw rod and the sliding sleeve.

[0013] As a preferred technical solution of the present invention, the positioning screw rod penetrates through the left and right corresponding two sliding sleeves and the left and right corresponding two first sliding holes. A positioning nut is threadedly connected to the positioning screw rod. The positioning nut squeezes and fixes one side of one of the assembly frames.

[0014] As a preferred technical solution of the present invention, the support disc is located between a plurality of positioning screws and has a horizontal axis. The centering part includes screw barrels respectively corresponding to the positioning screws, which are arranged on the outer ring wall of the support disc and rotatably installed through bearings. The screw barrels extend along the radial direction of the support disc. An adjusting screw is threadedly connected inside the screw barrel. A U-shaped bracket corresponding to each screw barrel is fixedly installed on the outer ring wall of the support disc. The adjusting screw slidably penetrates through the corresponding U-shaped bracket, and an arc-shaped abutting block is fixedly installed at the end of the adjusting screw away from the support disc.

[0015] As a preferred technical solution of the present invention, the extrusion part includes a rotating member arranged on the support disc. The rotating member includes a second motor fixedly installed on the left end face of the support disc. A turntable is rotatably installed on the right end face of the support disc through a bearing. The turntable and the support disc are concentric. Symmetrically arranged up and down linear modules are fixedly installed on the right end face of the turntable. The turntable is fixedly connected to the output end of the second motor.

[0016] As a preferred technical solution of the present invention, the extrusion part further includes an execution part arranged on the linear module. The execution part includes a hydraulic cylinder fixedly installed on the moving end of the linear module. An orthopedic arc block is fixedly installed at the output end of the hydraulic cylinder. A support square tube is fixedly installed between the upper and lower hydraulic cylinders.

[0017] The present invention also provides a method for preventing deformation during the welding of large-diameter water supply pipes, which is completed in cooperation with the above welding device, and specifically includes the following steps: S1: Preparation work: Check whether the material, size, and groove angle of the large-diameter water supply pipe meet the requirements, and clean the inner and outer surfaces of the pipe.

[0018] S2: Installation and positioning: Assemble a plurality of arc-shaped supports through a splicing and locking part to form two support rings, and install the two support rings on the outer ring walls of the opposite ends of adjacent large-diameter water supply pipes respectively.

[0019] S3: Reinforcement and alignment: Reinforce the two support rings respectively through the limiting mechanism, and at the same time perform horizontal alignment on the two adjacent large-diameter water supply pipes.

[0020] S4: Anti-deformation correction: Install the orthopedic mechanism into the limiting mechanism, and perform correction on the two large-diameter water supply pipes respectively through the orthopedic mechanism, and then remove the orthopedic mechanism.

[0021] S5: Port positioning: Group the ends of the two large-diameter water supply pipes, and adjust the coaxiality and clearance of the pipes to ensure good butt joint of the pipe ends.

[0022] S6: Welding process: Weld the connection part of the two pipes after positioning in step S5 through the welding mechanism.

[0023] S7: Post-weld treatment: After welding is completed, clean the surface of the weld seam and conduct non-destructive testing. At the same time, perform anti-corrosion treatment on the weld seam and the pipeline.

[0024] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the mutual cooperation of the welding mechanism, the limiting mechanism and the shaping mechanism provided in the present invention, an anti-deformation welding of large-diameter water supply pipelines is completed by using an integrated assembly model of welding, limiting and shaping. Through precise limiting and shaping, the axis alignment and regular shape of large-diameter water supply pipelines are ensured, the deformation and stress concentration during the welding process are reduced, the welding quality and weld strength are improved. At the same time, the integrated assembly model integrates a variety of functional modules, which is more convenient for transportation and assembly, has strong adaptability, and significantly improves the use reliability and practicability of the device.

[0025] 2. Through the mutual cooperation of the welding mechanism and the limiting mechanism provided in the present invention, a six-sided frame type stable alignment and fixation are applied to both sides of the water supply pipelines before welding. At the same time, the support ring is reinforced by the hexagonal assembly frame, thereby preventing the pipelines from moving or deforming during the welding process, ensuring the accuracy of the welding position, and ensuring the butt joint accuracy at the pipeline docking place, improving the welding quality.

[0026] 3. Through the mutual cooperation of the limiting mechanism and the shaping mechanism provided in the present invention, the pipeline axis is determined based on the six-sided frame, further ensuring the accuracy of pipeline docking. At the same time, the rotation center of the shaping mechanism is determined to avoid position deviation of the pipeline during the shaping process. And before welding, a two-way synchronous extrusion shaping is performed on the inner wall of the large-diameter water supply pipeline to ensure uniform shaping of the pipeline inner wall, improve the shaping effect. After shaping, the pipeline docking place is more likely to achieve a tight butt joint, thereby improving the sealing performance of the weld seam and reducing the leakage risk. Description of the Drawings

[0027] Figure 1 It is a three-dimensional structural schematic diagram when the present invention is working.

[0028] Figure 2 It is a three-dimensional structural schematic diagram of the present invention.

[0029] Figure 3 It is a three-dimensional structural schematic diagram of the arc-shaped support of the present invention.

[0030] Figure 4 It is a partial three-dimensional structural schematic diagram of the welding mechanism of the present invention.

[0031] Figure 5 It is a side view cross-sectional view of the driving part of the present invention.

[0032] Figure 6 It is a top view cross-sectional view of the driving part of the present invention.

[0033] Figure 7This is a three-dimensional structural diagram of the limit mechanism of the present invention.

[0034] Figure 8 is Figure 1 an enlarged schematic diagram of part A in

[0035] Figure 9 This is a three-dimensional structural diagram of the centering part of the present invention.

[0036] Figure 10 This is a schematic diagram of the three-dimensional structure of the execution part and the rotating part of the present invention.

[0037] In the figure: 1, arc-shaped support; 2, limit slideway; 3, tooth groove; 4, welding mechanism; 41, splicing and locking part; 411, arc-shaped clamping plate; 412, matching card slot; 413, first bolt; 42, driving component; 421, support slider; 422, roller; 423, first motor; 43, welding component; 431, electric push rod; 432, air jet pipe; 433, welding head; 5, limit mechanism; 51, support part; 511, support vertical plate; 512, sliding sleeve; 513, assembly frame; 52, limit part; 521, positioning screw; 522, positioning nut; 6, orthopedic mechanism; 61, centering part; 611, support disc; 612, screw cylinder; 613, adjusting screw; 614, arc-shaped abutting block; 62, rotating part; 621, second motor; 622, turntable; 623, linear module; 63, orthopedic execution part; 631, hydraulic cylinder; 632, orthopedic arc block; 633, support square tube. Detailed implementation manners

[0038] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] Please refer to Figure 1 , a large-diameter water supply pipeline anti-deformation welding device. The device provided by the present invention is used for Figure 1 welding and straightening operations at the connection of the two large-diameter water supply pipelines shown in Figure 1 . As shown in

[0040] , the two large-diameter water supply pipelines are placed on the external support seats. During construction, one side of the pipeline is fixed on the corresponding external support seat, while the other side of the pipeline requires external cranes to hoist it, so as to perform subsequent positioning and welding operations on both sides of the pipeline. Figure 1 , Figure 2 and Figure 3, the large-diameter water supply pipeline anti-deformation welding device includes a plurality of arc-shaped supports 1. The plurality of arc-shaped supports 1 are spliced to form a support ring, and the support ring is fixedly sleeved on the outer wall of the relative ends of adjacent large-diameter water supply pipelines. A limiting slideway 2 matching its arc surface is welded on the outer wall of the arc-shaped support 1, and the plurality of limiting slideways 2 on the support ring form an annular slideway.

[0041] Please refer to Figure 1 , Figure 2 and Figure 7 , a limiting mechanism 5 is arranged on the support ring, and an orthopedic mechanism 6 for performing two-way synchronous extrusion orthopedics on the inner wall of the large-diameter water supply pipeline is arranged on the limiting mechanism 5; the limiting mechanism 5 includes a support part 51 and a limiting part 52 arranged on the support ring; the support part 51 includes a plurality of support vertical plates 511 arranged on the opposite sides of adjacent support rings and evenly distributed circumferentially. A mounting frame 513 is jointly arranged between the plurality of support vertical plates 511 corresponding to the same support ring. The mounting frame 513 is in a hexagonal structure composed of a plurality of reinforcing plates spliced with each other; the limiting part 52 includes a positioning screw 521 penetrating between the opposite top corners of the front and rear two mounting frames 513. The left and right two mounting frames 513 and a plurality of positioning screws 521 form a hexagonal frame stable support structure, which can position and limit adjacent large-diameter water supply pipelines and improve the overall stability and strength.

[0042] Please refer to Figure 2 , Figure 7 and Figure 8 , the arc-shaped support 1 and the corresponding support vertical plate 511 are fixed by bolts, and a positioning block fitting the outer wall of the arc-shaped support 1 is fixedly installed on the side wall of the support vertical plate 511 close to the corresponding arc-shaped support 1.

[0043] Please refer to Figure 2 , Figure 7 and Figure 8 , sliding sleeves 512 are fixedly installed through the mutually remote ends of the support vertical plates 511 corresponding to the same support ring. The adjacent reinforcing plates forming the mounting frame 513 are mutually clamped. A first sliding hole is opened at the clamping end of the reinforcing plate, and the first sliding hole is movably connected with the positioning screw 521 and the sliding sleeve 512.

[0044] Please refer to Figure 2 and Figure 7 , the positioning screw 521 penetrates through the left and right corresponding two sliding sleeves 512 and the left and right corresponding two first sliding holes. A positioning nut 522 is threadedly connected to the positioning screw 521, and the positioning nut 522 squeezes and fixes one side of one of the mounting frames 513.

[0045] During actual operation, after the support ring is installed, the support vertical plate 511 is installed on the corresponding arc-shaped support 1 through bolts, and the positioning block is attached to the outer wall of the corresponding arc-shaped support 1 to provide support for the support vertical plate 511. Subsequently, the assembly frame 513 and the sliding sleeve 512 are connected through the corresponding first sliding holes. At this time, the assembly frames 513 on the same support ring form a hexagonal support structure to reinforce the support ring composed of multiple arc-shaped supports 1.

[0046] Then, the positioning screw 521 is sequentially passed through the two sliding sleeves 512 corresponding to the left and right and the two first sliding holes corresponding to the left and right. At this time, the positioning screw 521 locks the corresponding adjacent reinforcement plates, thereby locking the hexagonal support structure composed of the assembly frames 513. At the same time, the two assembly frames 513 on the left and right and multiple positioning screws 521 form a hexagonal frame stable support structure, so as to implement hexagonal frame stable alignment and fixation of the water supply pipes on both sides before welding, prevent the pipes from moving or deforming during the welding process, and ensure the accuracy of the welding position.

[0047] Subsequently, the large-diameter water supply pipe inner wall is subjected to two-way synchronous extrusion straightening by the straightening mechanism 6, and after the straightening is completed, the straightening mechanism 6 is withdrawn. Then, the movable pipe and the corresponding support ring are moved closer to the fixed pipe by an external crane. After the two pipes are butted, the positioning nut 522 is installed on the positioning screw 521, and then the positioning nut 522 is rotated to squeeze and fix the assembly frame 513 to complete the positioning of the two pipes.

[0048] Please refer to Figure 1 、 Figure 2 、 Figure 7 、 Figure 8 and Figure 9 The straightening mechanism 6 includes a support disk 611, a centering part 61, and an extrusion part for performing two-way synchronous extrusion straightening on the inner wall of the large-diameter water supply pipe. The support disk 611 is arranged between several positioning screws 521 and has a horizontal axis. The centering part 61 includes screw cylinders 612 corresponding one-to-one to the positioning screws 521 rotatably installed on the outer wall of the support disk 611 through bearings. The screw cylinders 612 extend radially along the support disk 611. The screw cylinders 612 are internally threaded with adjusting screws 613. U-shaped brackets corresponding one-to-one to the screw cylinders 612 are fixedly installed on the outer wall of the support disk 611. The adjusting screws 613 slidably penetrate through the corresponding U-shaped brackets. An arc-shaped abutting block 614 is fixedly installed at one end of the adjusting screw 613 away from the support disk 611.

[0049] Please refer to Figure 1 、 Figure 2 、 Figure 7 、 Figure 8 and Figure 9, the extrusion part includes a rotating member 62 arranged on the support disc 611 and an orthopedic actuator 63 arranged on the linear module 623; the rotating member 62 includes a second motor 621 fixedly installed on the left end face of the support disc 611, and a turntable 622 is rotatably installed on the right end face of the support disc 611 through a bearing. The turntable 622 and the support disc 611 are concentric. On the right end face of the turntable 622, symmetrically arranged linear modules 623 are fixedly installed up and down. The turntable 622 is fixedly connected to the output end of the second motor 621. The orthopedic actuator 63 includes a hydraulic cylinder 631 fixedly installed on the moving end of the linear module 623. The output end of the hydraulic cylinder 631 is fixedly installed with an orthopedic arc block 632. A support square tube 633 is fixedly installed between the upper and lower hydraulic cylinders 631.

[0050] During specific operation, when it is necessary to perform extrusion and orthopedic treatment on the inner wall of a large-diameter water supply pipe, the support disc 611 is hoisted by an external hoisting mechanism, so that the support disc 611 is placed between the support rings in a state where the axis extends forward and backward. Then, the support disc 611 is adjusted so that its axis extends left and right, and the support disc 611 is moved so that the orthopedic arc block 632 basically enters the pipe. Subsequently, the worker holds an electric rotary tool to rotate the screw cylinder 612. The U-shaped bracket will limit the rotation of the adjusting screw 613, so that the adjusting screw 613 linearly moves and extends a certain length. Subsequently, other screw cylinders 612 are rotated to make other adjusting screws 613, and by ensuring the number of turns of the rotation of the screw cylinder 612, it is ensured that the adjusting screws 613 extend the same length. At this time, the adjusting screw 613 will drive the arc-shaped abutting block 614 to squeeze the corresponding positioning screw 521, and the pipe axis is determined based on the hexagonal frame, further ensuring the accuracy of pipe butt joint, and at the same time determining the rotation center of the support disc 611.

[0051] Subsequently, the second motor 621 is started to drive the turntable 622 to rotate, and at the same time, the upper and lower hydraulic cylinders 631 are started. The maximum value of the telescopic end of the hydraulic cylinder 631 is set in advance, that is, the maximum moving distance of the orthopedic arc block 632 is limited. When the orthopedic arc block 632 finally stops moving, the distance between its outer arc surface and the center of the support disc 611 is equal to the radius of the pipe. In this way, before welding, two-way synchronous extrusion and orthopedic treatment are performed on the inner wall of the large-diameter water supply pipe, so as to uniformly orthopedic the inner wall of the pipe, improve the orthopedic effect, and make the butt joint of the pipe after orthopedic treatment easier to achieve a tight butt joint, which is beneficial to improving the sealing performance of the weld; the provided support square tube 633 can provide support when the upper and lower hydraulic cylinders 631 bear reverse pressure.

[0052] Please refer to Figure 1 、 Figure 3 and Figure 4A welding mechanism 4 for performing annular welding on the connection between adjacent large-diameter water supply pipes is provided on one of the annular slideways. The welding mechanism 4 includes a splicing locking portion 41 provided on the arc support 1 and used for splicing and fixing adjacent arc supports 1, a driving assembly 42 and a welding assembly 43.

[0053] See also Figure 2 , Figure 3 and Figure 4 The splicing locking portion 41 includes a matching slot 412 which is opened at one end of the arc support 1 and is symmetrical with respect to the corresponding limiting slide 2. An arc clamping plate 411 which corresponds to the matching slot 412 is fixedly installed at the other end of the arc support 1. The adjacent arc supports 1 are assembled with the arc clamping plate 411 through the matching slot 412; a No. 1 screw hole is penetrated through the matching slot 412 and the arc clamping plate 411, and a No. 1 bolt 413 is threadedly connected between the arc clamping plate 411 and the matching slot 412 through the No. 1 screw hole.

[0054] During the specific work, before welding the pipes on both sides, first fit multiple arc-shaped supports 1 with the outer ring wall of the pipe, and then assemble into two support rings by matching the card slot 412 with the arc-shaped card plate 411, and then fix the support ring on the outer ring wall of the pipe by matching the No. 1 bolt 413 with the No. 1 screw hole, so that the support ring is fixed to the opposite ends of the pipes on both sides respectively, and the pipes on both sides are not aligned close at this time.

[0055] See also Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 The driving component 42 includes a supporting slider 421 arranged on an annular slide composed of a plurality of limiting slides 2. An end surface of the supporting slider 421 close to the center of the arc support 1 is rotatably installed with a roller 422 sliding in the annular slide through a bearing seat. A first motor 423 is fixedly installed in the supporting slider 421. The output end of the first motor 423 is connected to the roller 422 through a gear set. A plurality of tooth grooves 3 meshing with the gear set are provided on the inner ring wall of the limiting slide 2. The tooth grooves 3 in the annular slide form a circle of tooth ring grooves. The welding component 43 includes an electric push rod 431 fixedly installed on the supporting slider 421. A welding head 433 and an air jet 432 are fixedly installed on the telescopic end of the electric push rod 431 through a supporting frame.

[0056] During specific operation, after the adjacent large-diameter water supply pipes are butt-jointed, start the first motor 423 to control the support slider 421 to slide along the annular slideway through the cooperation of the gear set and the tooth ring groove. The welding head 433 will move simultaneously with the support slider 421 and perform circular welding on the connection of the adjacent large-diameter water supply pipes. The electric push rod 431 is used to adjust the welding position of the welding head 433, and during the welding process, the air jet pipe 432 sprays inert gas to the welding part to protect the welding quality.

[0057] Please refer to Figures 1 to 10 , the present invention also provides a method for preventing deformation of large-diameter water supply pipes during welding, which is completed in cooperation with the above welding device, and specifically includes the following steps: S1: Preparation work: Check whether the material, size and groove angle of the large-diameter water supply pipes meet the requirements, and clean the inner and outer surfaces of the pipes.

[0058] S2: Installation and positioning: Install the two support rings composed of a plurality of arc-shaped supports 1 through the splicing and locking parts 41 on the outer ring walls of the opposite ends of the adjacent large-diameter water supply pipes respectively.

[0059] S3: Reinforcement and alignment: Install the support vertical plate 511 on the corresponding arc-shaped support 1, then sleevedly connect the first sliding hole on the assembly frame 513 with the sliding sleeve 512, and then insert the positioning screw 521 into the corresponding sliding sleeve 512 to lock the assembly frame 513 of the hexagonal support structure. At the same time, the left and right assembly frames 513 and a plurality of positioning screws 521 form a hexagonal frame stable support structure, so as to horizontally align the adjacent two large-diameter water supply pipes before welding.

[0060] S4: Anti-deformation correction: First, place the support disc 611 between the support rings in a state where the axis extends forward and backward, then adjust the support disc 611 so that its axis extends left and right, and move the support disc 611 so that the orthopedic arc block 632 basically enters the pipe. Then adjust the adjusting screw 613, and based on the hexagonal frame stable support structure, the adjusting screw 613 will drive the arc-shaped abutting block 614 to squeeze the corresponding positioning screw 521 to determine that the rotation center of the support disc 611 is at the pipe axis. Then start the hydraulic cylinders 631 on the upper and lower sides to move the orthopedic arc block 632 to perform two-way synchronous extrusion and correction on the inner wall of one of the large-diameter water supply pipes. Then release the pressing of the arc-shaped abutting block 614 and turn the support disc 611 around. Immediately install the above operation to perform two-way synchronous extrusion and correction on the inner wall of the other large-diameter water supply pipe, and withdraw the orthopedic mechanism 6 after the correction is completed.

[0061] S5: Port positioning: Then, use an external crane to move the movable pipe and the corresponding support ring closer to the fixed pipe. After the two pipes are butted, install the positioning nut 522 on the positioning screw 521, and then rotate the positioning nut 522 to squeeze and fix the assembly frame 513, thereby completing the butt joint of the ends of the two large-diameter water supply pipes, and adjusting the coaxiality and clearance of the pipes to ensure good butt joint of the pipe ends.

[0062] S6: Welding process: Use the welding mechanism 4 to weld the connection of the two pipes positioned in step S5.

[0063] S7: Post-welding treatment: After welding, clean the surface of the weld, perform non-destructive testing, and at the same time perform anti-corrosion treatment on the weld and the pipe.

[0064] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A large-diameter water supply pipeline anti-deformation welding device, comprising a welding mechanism for performing circumferential welding on the connection of adjacent large-diameter water supply pipelines, characterized in that: The welding device further includes a plurality of arc-shaped supports; The plurality of arc-shaped supports are spliced to form a support ring, and support rings are fixedly sleeved on the outer ring walls of the opposite ends of adjacent large-diameter water supply pipes; a limiting slideway matched with its arc surface is installed on the outer ring wall of the arc-shaped support, and the plurality of limiting slideways on the support ring form an annular slideway matched with the welding mechanism; The welding mechanism includes a splicing and locking part arranged on the arc-shaped support and used for locking the spliced support ring; A limiting mechanism, the limiting mechanism includes a supporting part and a limiting part arranged on the support ring; The supporting part includes supporting vertical plates arranged on the opposite sides of adjacent support rings and evenly distributed circumferentially, and an assembly frame is jointly arranged between the supporting vertical plates corresponding to the same support ring. The assembly frame is in a hexagonal structure composed of a plurality of reinforcing plates spliced with each other; The limiting part includes a positioning screw rod penetrating between the opposite top corners of the front and rear two assembly frames. The left and right two assembly frames and the positioning screw rod form a stable support structure of a hexagonal frame to position and limit adjacent pipes; A straightening mechanism; the straightening mechanism includes a support disc, a centering part and an extrusion part used for performing two-way synchronous extrusion and straightening on the inner wall of the large-diameter water supply pipe; the centering part cooperates with the hexagonal frame to make the support disc and the pipe coaxial, ensuring the accurate position of the straightening mechanism.

2. The large-diameter water supply pipeline anti-deformation welding device according to claim 1, characterized in that: The splicing and locking part includes a matching clamping groove opened at one end of the arc-shaped support and symmetric about the corresponding limiting slideway left and right. An arc-shaped clamping plate corresponding to the matching clamping groove is fixedly installed at the other end of the arc-shaped support. Adjacent arc-shaped supports are assembled by clamping through the matching clamping groove and the arc-shaped clamping plate.

3. The large-diameter water supply pipeline anti-deformation welding device according to claim 2, characterized in that: A first screw hole is penetrated through both the matching clamping groove and the arc-shaped clamping plate, and a first bolt is commonly screwed through the first screw hole between the clamped arc-shaped clamping plate and the matching clamping groove.

4. A large-diameter water supply pipeline anti-deformation welding device according to claim 1, characterized in that: Sliding sleeves are fixedly penetrated and installed at the mutually remote ends of the supporting vertical plates corresponding to the same support ring. Adjacent reinforcing plates forming the assembly frame are clamped with each other. A first sliding hole is opened at the clamping end of the reinforcing plate, and the first sliding hole is movably connected with the positioning screw rod and the sliding sleeve.

5. The anti-deformation welding device for large-diameter water supply pipelines according to claim 4, characterized in that: The positioning screw rod penetrates through the left and right corresponding two sliding sleeves and the left and right corresponding two first sliding holes. A positioning nut is screwed on the positioning screw rod, and the positioning nut squeezes and fixes one side of one of the assembly frames.

6. The anti-deformation welding device for large-diameter water supply pipelines according to claim 1, characterized in that: The support disc is located between a plurality of positioning screw rods and has a horizontal axis. The centering part includes screw cylinders arranged on the outer ring wall of the support disc and rotatably installed through bearings and corresponding to the positioning screw rods one by one. The screw cylinders extend radially along the support disc. An adjusting screw rod is screwed in the screw cylinder. A U-shaped bracket corresponding to the screw cylinder one by one is fixedly installed on the outer ring wall of the support disc. The adjusting screw rod slidably penetrates through the corresponding U-shaped bracket, and an arc-shaped abutting block is fixedly installed at the end of the adjusting screw rod far away from the support disc.

7. A large-diameter water supply pipeline anti-deformation welding device according to claim 1, characterized in that: The extrusion part includes a rotating part arranged on the support disc. The rotating part includes a second motor fixedly installed on the left end face of the support disc. A turntable is rotatably installed on the right end face of the support disc through a bearing. The turntable and the support disc share the same center. Symmetrically arranged linear modules are fixedly installed on the right end face of the turntable. The turntable is fixedly connected with the output end of the second motor.

8. The large-diameter water supply pipeline anti-deformation welding device according to claim 7, characterized in that: The extrusion part further includes an orthopedic actuator arranged on the linear module. The orthopedic actuator includes a hydraulic cylinder fixedly installed on the mobile end of the linear module, and an orthopedic arc block is fixedly installed at the output end of the hydraulic cylinder.

9. The anti-deformation welding device for large-diameter water supply pipelines according to claim 1, characterized in that: The arc-shaped support is fixedly connected to the corresponding support vertical plate by bolts; the welding mechanism further includes a driving component and a welding component.

10. A method for preventing deformation during welding of a large-diameter water supply pipe, which is completed in cooperation with the large-diameter water supply pipe anti-deformation welding device as described in claim 1, and is characterized in that: Specifically, it includes the following steps: S1: Preparation work: Check whether the material, size and bevel angle of the large-diameter water supply pipe meet the requirements, and clean the inner and outer surfaces of the pipe. S2: Installation and positioning: Assemble multiple arc-shaped supports through the splicing and locking parts to form two support rings, and install the two support rings on the outer ring walls of the opposite ends of adjacent large-diameter water supply pipes respectively. S3: Reinforcement and alignment: Reinforce the two support rings respectively through the limiting mechanism, and at the same time perform horizontal alignment on the two adjacent large-diameter water supply pipes. S4: Anti-deformation correction: Install the orthopedic mechanism into the limiting mechanism, and correct the two large-diameter water supply pipes respectively through the orthopedic mechanism, and then withdraw the orthopedic mechanism. S5: Port positioning: Connect the ends of the two large-diameter water supply pipes, and adjust the coaxiality and clearance of the pipes to ensure good butt joint of the pipe ends. S6: Welding process: Weld the joints of the two pipes positioned in step S5 through the welding mechanism. S7: Post-welding treatment: After welding, clean the surface of the weld, perform non-destructive testing, and at the same time perform anti-corrosion treatment on the weld and the pipe.

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