A municipal pipeline welding support and positioning device and welding method

Abstract

This invention discloses a municipal pipeline welding support and positioning device and welding method, relating to the field of pipeline welding technology. The municipal pipeline welding support and positioning device includes a traveling module and an expansion module. The expansion module includes a central crossbar, a movable crossplate, a first electromagnetic support block, and a second electromagnetic support block. An inwardly recessed gap is provided between the first and second electromagnetic support blocks. The first electromagnetic support block can move axially along the central crossbar to drive the first and second annular end faces to approach and fit together. The outer ring weld is located in the middle of the inwardly recessed gap, i.e., the first and second electromagnetic support blocks are located on opposite sides of the outer ring weld, which avoids the problem of the outer ring weld sticking to the first / second electromagnetic support blocks during weld penetration. This allows the expansion structure to smoothly detach from the pipeline, and the expansion structure to smoothly contract and travel to the next work node.

Description

Technical Field

[0001] This invention relates to the field of pipeline welding technology, specifically to a municipal pipeline welding support and positioning device and welding method. Background Technology

[0002] Municipal pipelines are mostly for water transportation, and include both concrete and metal pipes. Adjacent metal pipes are typically connected and sealed by welding. Before welding, adjacent metal pipes need to be aligned to improve weld quality.

[0003] The internal support pipe alignment technology is highly operable, as it does not occupy the outer surface space of the pipe, thus facilitating welding of the outer surface of the pipe and obtaining a continuous weld.

[0004] Chinese patent “A workpiece welding positioning fixture” (publication number: CN120502959A) discloses a technical solution of “aligning the pipe with an abutting roller expansion structure”, but it requires the two ends of the same abutting roller to abut against the inner walls of two adjacent pipes respectively; if the welding process is broken through, the expansion structure will stick to the two pipes, making it difficult for the expansion structure to shrink, difficult to remove from the pipe and transfer to the next operation node. Summary of the Invention

[0005] In order to overcome the problem that "traditional internal support pipe alignment technology cannot deal with weld penetration and bonding" in the above-mentioned background technology, the present invention provides a municipal pipe welding support positioning device and welding method.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0007] A municipal pipeline welding support and positioning device includes a traveling module and an expansion module disposed at the end of the traveling module. The expansion module includes a central crossbar, a movable crossplate, a first electromagnetic support block, and a second electromagnetic support block. The movable crossplate is disposed on the outer periphery of the central crossbar, and the distance between the movable crossplate and the central crossbar is adjustable. The surface of the movable crossplate away from the central crossbar is a mounting surface. The first electromagnetic support block is disposed at the end of the mounting surface away from the traveling module, and the second electromagnetic support block is disposed at the end of the mounting surface near the traveling module. The expansion module can expand until the first electromagnetic support block abuts against and pushes the pipeline being installed. The inner wall and the second electromagnetic support block abut against the inner wall of the completed pipe, so that the first annular end face of the pipe being installed and the second annular end face of the completed pipe are coaxially arranged; a concave gap is provided between the first electromagnetic support block and the second electromagnetic support block; an outer ring weld is provided in the middle of the concave gap to avoid adhesion between the first electromagnetic support block and / or the second electromagnetic support block; the first electromagnetic support block can magnetically attract the inner wall of the pipe being installed, and the second electromagnetic support block can magnetically attract the inner wall of the completed pipe; the first electromagnetic support block can move axially along the central crossbar to drive the first annular end face and the second annular end face to approach and fit together.

[0008] As a further optimization of the present invention, a first connecting block is provided between the first electromagnetic support block and the movable horizontal plate; a second connecting block is provided between the second electromagnetic support block and the movable horizontal plate.

[0009] As a further optimization of the present invention, the expansion module further includes a diagonal brace connecting rod and a first linear actuator; one end of the diagonal brace connecting rod is rotatably connected to the central crossbar and the other end is rotatably connected to the movable cross plate; one end of the first linear actuator is rotatably connected to the central crossbar and the other end is rotatably connected to the movable cross plate.

[0010] As a further optimization of the present invention, the movable horizontal plate is arranged parallel to the central horizontal bar; the movable horizontal plate, the central horizontal bar, and the diagonal bracing link form a parallelogram structure.

[0011] As a further optimization of the present invention, the vertical distance between the first electromagnetic support block and the central crossbar is equal to the vertical distance between the second electromagnetic support block and the central crossbar; a first distance sensor is provided beside the first connecting block, and a second distance sensor is provided beside the second connecting block; the first connecting block, the second connecting block, the first distance sensor, and the second distance sensor are arranged in a linear array along the axial direction of the central crossbar; the vertical distance between the first distance sensor and the central crossbar is equal to the vertical distance between the second distance sensor and the central crossbar.

[0012] As a further optimization of the present invention, a first fan is provided at the end of the traveling module near the expansion module. The first fan can blow to form a swirling flow, which is discharged through the inner cavity of the pipe being installed. The swirling flow can flow at an angle through the concave gap and cool the outer ring weld, the first electromagnetic support block, and the second electromagnetic support block. The traveling module includes a support body, and an air passage is provided inside the support body. The air passage includes an air inlet and an air outlet, and the air outlet is located on the side of the first fan away from the expansion module. The central crossbar has a hollow structure, and the air inlet is connected to one end of the inner cavity of the central crossbar. The end of the central crossbar away from the traveling module is connected to and communicates with the air inlet pipe. The air inlet pipe is used to inject external cooling gas into the air passage and compensate for the air pressure in the inner cavity of the completed pipe. The end of the air inlet pipe is placed inside the pipe being installed.

[0013] As a further optimization of the present invention, a base plate is connected to the end of the first connecting block, and the base plate is connected to the movable cross plate through a slide rail assembly; a first telescopic sleeve and a second telescopic sleeve are sleeved on the outer periphery of the slide rail assembly; the pleats of the first telescopic sleeve are inclined and the inclination angle is adapted to the inclination angle of the first fan axis; the pleats of the second telescopic sleeve are inclined and the inclination angle is adapted to the inclination angle of the first fan axis.

[0014] As a further optimization of the present invention, the traveling module further includes support legs, moving wheels, and sealing plates; the support legs are radially arranged on the outer surface of the support body; the ends of the support legs away from the support body are connected to the moving wheels; the sealing plates are arranged between adjacent support legs; and a first motor for driving the moving wheels to rotate is provided inside the support body.

[0015] As a further optimization of the present invention, a junction box is provided inside the support body; a first wire is provided at the bottom of the outer surface of the central crossbar, one end of the first wire is connected to the junction box, and the other end is detachably connected to an external wire.

[0016] A method for welding municipal pipelines, employing a municipal pipeline welding support and positioning device to align the pipeline being installed with a completed pipeline before welding, includes the following steps: S1, disconnecting the first conductor from the external conductor, and then removing the external conductor; S2, hoisting the pipeline being installed and placing it on a foundation pad; S3, inserting the external conductor into the inner cavity of the pipeline being installed and connecting it to the first conductor; S4, the expansion module retracts, and then the traveling module moves towards the pipeline being installed until both the first annular end face and the second annular end face are fitted onto the outer circumference of the expansion module; S5, the expansion module expands, causing the first annular end face and the second annular end face to overlap. The annular end faces are coaxially arranged; S6, the first electromagnetic support block is adsorbed onto the inner wall of the pipe being installed, and the second electromagnetic support block is adsorbed onto the inner wall of the completed pipe; then the first electromagnetic support block moves towards the second electromagnetic support block, so that the first annular end face and the second annular end face fit together; S7, the air inlet pipe is inserted into the pipe being installed and connected to the central crossbar; S8, the outer walls of the pipe being installed and the completed pipe at the fitting position are welded to obtain the outer ring weld; S9, the first fan is started to form a vortex, and at the same time, the cooling gas is transported to the starting end of the vortex through the air inlet pipe to cool the outer ring weld.

[0017] In summary, the present invention has at least one of the following advantages:

[0018] (1) In this invention, the first electromagnetic support block and the second electromagnetic support block abut against the pipe being installed and the pipe that has been completed from the inside, respectively. There is an inner concave gap between the first electromagnetic support block and the second electromagnetic support block. The outer ring weld is located in the middle of the inner concave gap. That is, the first electromagnetic support block and the second electromagnetic support block are located on both sides of the outer ring weld, which can avoid the problem of the outer ring weld sticking to the first electromagnetic support block / second electromagnetic support block when the weld is burned through. This allows the expansion structure to smoothly separate from the pipe, and allows the expansion structure to smoothly contract and travel to the next work node.

[0019] (2) The expansion and contraction of the expansion module are controlled by electricity, and whether the pipe being installed is in contact with the first electromagnetic support block and whether the completed pipe is in contact with the second electromagnetic support block can be automatically monitored by the first distance sensor and the second distance sensor, thereby improving the degree of automation in the construction process of the present invention.

[0020] (3) The first electromagnetic support block can adsorb the inner wall of the pipe being installed; when the first electromagnetic support block moves towards the second electromagnetic support block, it can apply friction to the pipe being installed, thereby making the first annular end face and the second annular end face fit together, so that the pipe being installed and the pipe that has been completed are close together, thereby improving the subsequent welding quality and avoiding the problem of the outer ring weld breaking.

[0021] (4) The end of the traveling module is equipped with a fan that can generate swirling flow; the swirling flow can pass through the concave gap at an angle, and then carry away the heat from the inner side of the concave weld, the vicinity of the first electromagnetic support block, and the vicinity of the second electromagnetic support block. Compared with the traditional DC air, the present invention has a better heat dissipation effect (DC air can only flow out of the inner cavity of the pipe to the outside by flowing along the axial direction of the central crossbar, and it cannot pass through the concave gap, resulting in a worse heat dissipation efficiency and effect).

[0022] (5) The central crossbar is hollow, so the cooling gas can pass through the expansion module more conveniently through the inner cavity of the central crossbar and be transported to the starting end of the vortex, so as to avoid the negative pressure generated at the starting end of the vortex, and thus allow the gas in the pipe to be smoothly discharged from the inner cavity of the pipe being installed.

[0023] (6) The pleats of the first telescopic sleeve are tilted and the tilt angle is adapted to the tilt angle of the first fan shaft; the pleats of the second telescopic sleeve are tilted and the tilt angle is adapted to the tilt angle of the first fan shaft. This is to enable the swirling flow to adapt to the concave part of the pleats of the first telescopic sleeve and the concave part of the pleats of the second telescopic sleeve, thereby blowing off the dust particles adhering to the pleats, thus avoiding the problem of damage to the first / second telescopic sleeves due to frequent compression of dust particles during extension and retraction.

[0024] (7) An L-shaped telescopic rod is installed at the end of the first side extension block, and a hook that can extend elastically is provided at the top of the telescopic rod. When the first electromagnetic support block moves away from the second electromagnetic support block, the hook can abut against the second annular end face and push the pipe being installed away from the pipe that has been completed, thus avoiding the problem of the outer wall end of the pipe being installed getting stuck with the inner wall end of the pipe that has been completed.

[0025] (8) The end of the telescopic rod is inserted into the first side extension block and can extend elastically. After the vertical rod abuts against the end of the second side extension block, if the first electromagnetic support block continues to move closer to the second electromagnetic support block, the first compression spring is compressed and the horizontal rod retracts into the first insertion hole, thereby increasing the movable distance of the first electromagnetic support block, and thus providing space support for the first annular end face and the second annular end face to approach and fit together.

[0026] (9) At the construction node location, near the side of the completed pipeline, multiple completed pipelines have been welded and have a long length, making it difficult to lay wires and transport cooling gas. In contrast, in this invention, at the construction node location, near the side of the pipeline being installed, wires can be laid and cooling gas can be transported conveniently, thereby reducing the difficulty of operation and improving the efficiency of operation. Attached Figure Description

[0027] The present application will be further explained below with reference to the accompanying drawings:

[0028] Figure 1 This is a front view schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a front view schematic diagram of the expansion module's expansion state;

[0030] Figure 3 This is a front view schematic diagram of the expansion module structure;

[0031] Figure 4 This is a schematic diagram showing the location of the outer ring weld and the inner recess gap;

[0032] Figure 5 A left-side view of the first electromagnetic support block abutting against the inner wall of the pipe being installed;

[0033] Figure 6 A left-side view of the second electromagnetic support block abutting against the inner wall of the pipe being installed;

[0034] Figure 7 This is a schematic diagram showing the positions of the first and second annular end faces.

[0035] Figure 8 A top view diagram showing the location and structure of the slide rail assembly;

[0036] Figure 9 A top view schematic diagram showing the position and structure of the first and second telescopic sheaths;

[0037] Figure 10 A front view diagram showing the mounting positions of the first and second distance sensors;

[0038] Figure 11 This is a front view diagram showing the position of the first fan and the swirl.

[0039] Figure 12 This is a frontal view of the airway location and structure.

[0040] Figure 13 A top view of the connection structure between the air pump and the refrigeration unit;

[0041] Figure 14 A top-view diagram showing the first fan in its installed state;

[0042] Figure 15 This is a side view of the traveling module structure.

[0043] Figure 16 A top-view diagram showing the swirling flow passing through the concave gap at an angle.

[0044] Figure 17 A top view of the first telescopic sheath in its pleated, tilted configuration.

[0045] Figure 18 A front view diagram showing the location and structure of the foundation and pad blocks;

[0046] Figure 19 This is a top-view diagram showing the outer wall end of the pipe being installed stuck to the inner wall end of the completed pipe.

[0047] Figure 20 A front view diagram showing the position and structure of the telescopic rod and hook.

[0048] Figure 21 This is a schematic cross-sectional view of the connection structure between the first side extension block and the crossbar;

[0049] Figure 22 This is a cross-sectional schematic diagram of the connection structure between the hook and the vertical rod.

[0050] Explanation of reference numerals in the attached figures:

[0051] In the picture,

[0052] 1. Traveling module; 11. Support body; 110. Air passage; 111. Counterweight; 12. Support legs; 13. Casters; 14. Sealing plate;

[0053] 2. Expansion module; 21. Central crossbar; 22. Movable crossplate; 23. First electromagnetic support block; 230. Concave gap; 231. First connecting block; 2311. First side extension block; 23111. First insertion hole; 23112. First stop step; 23113. First retaining ring; 23114. First compression spring; 23115. First end cap; 2312. First distance sensor; 2313. Telescopic rod; 23131. Crossbar; 23132. Vertical rod; 23133. Reinforcing diagonal rod; 23134. Ventilation hole; 23135. Second insertion hole; 23136. 23137, Second stop step; 23138, Second retaining ring; 23139, Second end cap; 2314, Hook; 232, Second linear actuator; 233, Base plate; 234, Slide rail assembly; 2341, Slider; 2342, Rail; 2343, First fin plate; 2344, First telescopic sleeve; 2345, First end plate; 2346, Second telescopic sleeve; 24, Second electromagnetic support block; 241, Second connecting block; 2411, Second side extension block; 2412, Second distance sensor; 25, Diagonal brace connecting rod; 26, First linear actuator;

[0054] 3. Completed pipeline; 30. Outer ring weld; 31. First annular end face;

[0055] 4. Pipe being installed; 40. First gap; 41. Second annular end face;

[0056] 5. First fan; 51. Swirl;

[0057] 6. Foundation; 61. Spacer block;

[0058] 7. Inlet pipe; 71. Air pump; 72. Connecting pipe; 73. Refrigeration unit. Detailed Implementation

[0059] Based on the above-described structural features of this application, the implementation methods of this application will be further described as follows:

[0060] Reference Figures 1-2 This embodiment provides a municipal pipeline welding support and positioning device, including a traveling module 1 and an expansion module 2 disposed at the end of the traveling module 1. The traveling module 1 is used to push the expansion module 2 to move inside the pipeline.

[0061] The pipeline includes pipe 3, which has been completed, and pipe 4, which is currently being installed. (See reference...) Figure 1 Figure 2 and Figure 13The pipe that has been welded is the completed pipe 3; the pipe waiting to be welded is the pipe 4 being installed. Both the completed pipe 3 and the pipe 4 being installed are steel pipes, which facilitates welding and is used for adsorption with the first electromagnetic support block 23 and the second electromagnetic support block 24.

[0062] Reference Figure 3 and Figure 4 The expansion module 2 includes a central crossbar 21, a movable cross plate 22, a first electromagnetic support block 23, and a second electromagnetic support block 24. The movable cross plate 22 is located on the outer periphery of the central crossbar 21, and the distance between the movable cross plate 22 and the central crossbar 21 is adjustable. When the distance between the movable cross plate 22 and the central crossbar 21 increases, the expansion module 2 expands; when the distance between the movable cross plate 22 and the central crossbar 21 decreases, the expansion module 2 contracts (the contraction of the expansion module 2 is used to prevent the first electromagnetic support block 23 from colliding and jamming with the second annular end face 41 during the insertion of the expansion module 2 into the pipe 4 being installed). The surface of the movable cross plate 22 away from the central crossbar 21 is the mounting surface. The first electromagnetic support block 23 is located at the end of the mounting surface away from the traveling module 1, and the second electromagnetic support block 24 is located at the end of the mounting surface close to the traveling module 1.

[0063] Reference Figure 1 and Figure 4 The expansion module 2 can expand until the first electromagnetic support block 23 abuts against and pushes the inner wall of the pipe 4 being installed, and the second electromagnetic support block 24 abuts against the inner wall of the completed pipe 3, so that the first annular end face 31 of the pipe 4 being installed and the second annular end face 41 of the completed pipe 3 are coaxially arranged. The surfaces of the first electromagnetic support block 23 away from the central crossbar 21 and the surfaces of the second electromagnetic support block 24 away from the central crossbar 21 are coplanar.

[0064] Reference Figure 5 and Figure 6 The surface of the first electromagnetic support block 23 furthest from the central crossbar 21 is arc-shaped and can fit and conform to the inner wall of the pipe 4 being installed. The surface of the second electromagnetic support block 24 furthest from the central crossbar 21 is arc-shaped and can fit and conform to the inner wall of the completed pipe 3.

[0065] Reference Figure 7 The completed pipe 3 has a circular cross-section, and the pipe 4 being installed also has a circular cross-section. The end face of the completed pipe 3 closest to the pipe 4 being installed is the first annular end face 31; the end face of the pipe 4 being installed is the second annular end face 41. Both the first annular end face 31 and the second annular end face 41 are circular in shape.

[0066] Reference Figure 4A concave gap 230 is provided between the first electromagnetic support block 23 and the second electromagnetic support block 24; the outer ring weld 30 is located in the middle of the concave gap 230 to avoid adhesion between the first electromagnetic support block 23 and / or the second electromagnetic support block 24. In this invention, even if the pipe melts through, the outer ring weld 30 will still not contact and adhere to the first electromagnetic support block 23 / second electromagnetic support block 24, thereby avoiding the problem that the expansion module 2 is difficult to detach from the pipe after welding.

[0067] Reference Figure 3 A first connecting block 231 is provided between the first electromagnetic support block 23 and the movable horizontal plate 22, and the first connecting block 231 is used to support the first electromagnetic support block 23; a second connecting block 241 is provided between the second electromagnetic support block 24 and the movable horizontal plate 22, and the second connecting block 241 is used to support the second electromagnetic support block 24.

[0068] Reference Figure 7 After the pipe 4 being installed is aligned (i.e., the first annular end face 31 and the second annular end face 41 are coaxial), a first gap 40 usually appears between the first annular end face 31 and the second annular end face 41 (because the pipe 4 being installed is initially set at an angle). The presence of the first gap 40 will cause a significant decrease in welding quality. To avoid such problems, the first electromagnetic support block 23 can magnetically adhere to the inner wall of the pipe 4 being installed, and the second electromagnetic support block 24 can magnetically adhere to the inner wall of the completed pipe 3. The first electromagnetic support block 23 can move axially along the central crossbar 21. When the first electromagnetic support block 23 moves towards the second electromagnetic support block 24, it can drive the first annular end face 31 and the second annular end face 41 to move closer to each other and fit together (the first electromagnetic support block 23 adheres to the inner wall of the pipe 4 being installed and generates friction, so when the first electromagnetic support block 23 moves, it can drive the entire pipe 4 being installed to move towards the completed pipe 3, thereby making the first annular end face 31 and the second annular end face 41 move closer to each other and fit together). When the width of the first gap 40 is less than the stroke of the first electromagnetic support block 23, that is, the second annular end face 41 abuts against the first annular end face 31 in advance, the first electromagnetic support block 23 and the pipe 4 being installed will slide relative to each other. Thus, the first electromagnetic support block 23 does not need to stop moving midway, and therefore does not need a corresponding stroke control structure, thereby simplifying the structure of the present invention and reducing costs.

[0069] Reference Figure 7 and Figure 8The first connecting block 231 is vertically fixed to a base plate 233 (e.g., by bolts). The base plate 233 is parallel to and slidably connected to the movable cross plate 22. The first electromagnetic support block 23, the first connecting block 231, and the base plate 233 can reciprocate synchronously (at the same time, at the same speed, and in the same direction) along the axial direction of the central cross bar 21. The central cross bar 21 has a straight rod structure.

[0070] Reference Figure 7 An extension is provided at the end of the movable horizontal plate 22 near the first electromagnetic support block 23; the extension is fixedly connected to the movable horizontal plate 22 (e.g., by bolts or by welding). A second linear actuator 232 is fixedly mounted on the surface of the extension away from the central crossbar 21. The housing of the second linear actuator 232 is fixedly connected to the extension (e.g., by bolts), and the output shaft of the second linear actuator 232 is fixedly connected to the first connecting block 231 or the base plate 233 (e.g., by bolts). The second linear actuator 232 can drive the first electromagnetic support block 23, the first connecting block 231, and the base plate 233 to reciprocate synchronously along the axial direction of the central crossbar 21.

[0071] Reference Figure 7 and Figure 8 The base plate 233 and the movable cross plate 22 are connected by a slide rail assembly 234. The slide rail assembly 234 includes a slider 2341 and a track 2342. The track 2342 is fixedly installed on the mounting surface of the movable cross plate 22 (e.g., by bolts). The slider 2341 is fastened to the track 2342 and slidably connected. The surface of the base plate 233 near the movable cross plate 22 is fixedly connected to the slider 2341 (e.g., by bolts), thereby guiding the movement direction of the base plate 233. Each base plate 233 has a slider 2341 at each of its four corners. The four sliders 2341 are arranged in pairs and connected to two tracks 2342 respectively. The two tracks 2342 are arranged parallel to each other.

[0072] Reference Figure 3 and Figure 7 The first connecting block 231 is fixedly connected to the first electromagnetic support block 23 at one end away from the movable horizontal plate 22 (e.g., by bolts). The second connecting block 241 is fixedly connected to the second electromagnetic support block 24 at one end (e.g., by bolts) and to the movable horizontal plate 22 at the other end (e.g., by bolts). The first connecting block 231, the second connecting block 241, and the movable horizontal plate 22 are connected in a U-shaped structure to form a concave gap 230 between the first connecting block 231 and the second connecting block 241.

[0073] Reference Figure 8 and Figure 9The slide rail assembly 234 is fitted with a first telescopic sleeve 2344 and a second telescopic sleeve 2346 around its outer periphery. Both the first telescopic sleeve 2344 and the second telescopic sleeve 2346 are plastic shell membrane structures that are bent into a wavy shape, thereby achieving adaptive expansion and contraction to prevent dust from adhering to the connection position between the slider 2341 and the track 2342, and thus prevent the slider 2341 and the track 2342 from getting stuck.

[0074] Reference Figure 8 and Figure 9 One end of the first telescopic sleeve 2344 is fixedly connected to the base plate 233 (e.g., by means of a pressure strip and bolts, the pressure strip being used to prevent the first telescopic sleeve 2344 from being damaged due to concentrated force), and the other end is fixedly connected to the first finned plate 2343 (e.g., by means of a pressure strip and bolts, the pressure strip being used to prevent the first telescopic sleeve 2344 from being damaged due to concentrated force). The first finned plate 2343 is an n-shaped plate structure that can be fitted and fastened to the outer periphery of the housing of the second linear actuator 232, and the first finned plate 2343 is fixedly connected to the outer surface of the housing of the second linear actuator 232 (e.g., by means of bolts). One end of the second telescopic sleeve 2346 is fixedly connected to the base plate 233 (e.g., by means of a pressure strip and bolts, the pressure strip being used to prevent the second telescopic sleeve 2346 from being damaged due to concentrated force), and the other end is fixedly connected to the first end plate 2345 (e.g., by means of a pressure strip and bolts, the pressure strip being used to prevent the second telescopic sleeve 2346 from being damaged due to concentrated force). The first end plate 2345 is vertically and fixedly connected to the mounting surface of the movable horizontal plate 22 (e.g., by bolts).

[0075] Reference Figure 3 The expansion module 2 also includes a diagonal brace 25 and a first linear actuator 26. One end of the diagonal brace 25 is rotatably connected to the central crossbar 21 (e.g., via a pivot shaft), and the other end is rotatably connected to the movable crossbar 22 (e.g., via a pivot shaft). One end of the first linear actuator 26 is rotatably connected to the central crossbar 21 (e.g., via a pivot shaft), and the other end is rotatably connected to the movable crossbar 22 (e.g., via a pivot shaft). The movable crossbar 22 is arranged parallel to the central crossbar 21; the movable crossbar 22, the central crossbar 21, and the diagonal brace 25 form a parallelogram structure. When the output shaft of the first linear actuator 26 extends or retracts, the distance between the movable crossbar 22 and the central crossbar 21 changes, thereby realizing the expansion and contraction of the expansion module 2.

[0076] The movable horizontal plate 22 has several (no fewer than four) arranged in a circular array with equal spacing and equal angles around the outer periphery of the central horizontal bar 21. Each movable horizontal plate 22 has a first electromagnetic support block 23 and a second electromagnetic support block 24 at its mounting surface. The first electromagnetic support blocks 23 are arranged in a circular array with equal spacing and equal angles around the outer periphery of the central horizontal bar 21, and the second electromagnetic support blocks 24 are arranged in a circular array with equal spacing and equal angles around the outer periphery of the central horizontal bar 21, thereby increasing the contact area between the expansion module 2 and the pipe, and thus increasing the magnetic attraction and friction, so as to achieve the purpose of swinging and pulling the pipe 4 being installed.

[0077] Reference Figure 10 The vertical distance between the first electromagnetic support block 23 and the central crossbar 21 is equal to the vertical distance between the second electromagnetic support block 24 and the central crossbar 21. A first distance sensor 2312 is provided on the side of the first connecting block 231, and a second distance sensor 2412 is provided on the side of the second connecting block 241. The first connecting block 231, the second connecting block 241, the first distance sensor 2312 and the second distance sensor 2412 are arranged in a linear array along the axial direction of the central crossbar 21.

[0078] Reference Figure 10 The first distance sensor 2312 is used to detect the vertical distance H1 between itself and the pipe 4 being installed, and the second distance sensor 2412 is used to detect the vertical distance H2 between itself and the completed pipe 3. Since the vertical distance between the first distance sensor 2312 and the central crossbar 21 is equal to the vertical distance between the second distance sensor 2412 and the central crossbar 21, H1 and H2 can be used to provide feedback on whether the pipe 4 being installed and the completed pipe 3 are aligned (for example, when the absolute value of the difference between H1 and H2 is less than 1 mm, it is determined that the end of the pipe 4 being installed and the end of the completed pipe 3 are aligned, that is, the first annular end face 31 and the second annular end face 41 are in a coaxial state).

[0079] The data of H1 and H2 are in multiple sets, and the number of sets is equal to the number of movable cross plates 22. When more than half of the data of H1 and H2 reach the required condition (i.e., the absolute value of the difference between H1 and H2 in the same set is less than 1 mm), it is determined that the end of the pipe 4 being installed and the end of the pipe 3 that has been completed are aligned, that is, the first annular end face 31 and the second annular end face 41 are in a coaxial state.

[0080] Reference Figure 10A first side extension block 2311 is fixedly installed on the side wall of the first connecting block 231 near the side wall of the second connecting block 241. The first side extension block 2311 and the first connecting block 231 are fixedly connected in a T-shape (e.g., by bolts). The first distance sensor 2312 is fixedly connected to the first side extension block 2311 (e.g., by bolts). A second side extension block 2411 is fixedly installed on the side wall of the second connecting block 241 near the side wall of the first connecting block 231. The second side extension block 2411 and the second connecting block 241 are fixedly connected in a T-shape (e.g., by bolts). The second distance sensor 2412 is fixedly connected to the second side extension block 2411 (e.g., by bolts).

[0081] Reference Figures 11-13 The travel module 1 has a first fan 5 near the end of the expansion module 2, and the first fan 5 is set at an angle. Several first fans 5 are arranged in a circular array around the central crossbar 21. The first fans 5 can blow air to form a vortex 51, which is discharged through the inner cavity of the pipe 4 being installed (in conjunction with...). Figure 13 Because the completed pipe 3 is connected in series, its internal length and angle cannot achieve rapid discharge of hot air.

[0082] Reference Figure 11 The first fan 5 has several units arranged in a circular array along the surface of the support body 11. The outer casing of the first fan 5 is fixedly connected to the support body 11 by bolts.

[0083] Reference Figure 4 and Figure 16 The swirling flow 51 can flow at an angle through the concave gap 230 and cool the outer ring weld 30, the first electromagnetic support block 23 and the second electromagnetic support block 24 (the first electromagnetic support block 23 uses electromagnetic principle and will generate heat when running; the second electromagnetic support block 24 uses electromagnetic principle and will generate heat when running; the swirling flow 51 cannot directly contact the outer ring weld 30, but can cool the inner wall of the pipe).

[0084] Reference Figure 12 The traveling module 1 includes a support body 11, within which an air duct 110 is provided. The air duct 110 has a transverse T-shaped cross-section. The air duct 110 includes an air inlet and an air outlet. The air inlet is located at the center of the end face of the support body 11, and the air outlet is located on the side wall of the support body 11. The air outlet is located on the side of the first fan 5 away from the expansion module 2 (e.g., Figure 12From the perspective shown, the air outlet is used to replenish gas to the right side of the first fan 5, thereby avoiding negative pressure in the inner cavity of the completed pipe 3, so as to ensure that the vortex 51 can be discharged through the left end of the pipe 4 being installed. The central crossbar 21 has a hollow structure, and the air inlet is connected to one end of the inner cavity of the central crossbar 21; the end of the central crossbar 21 away from the travel module 1 is detachably connected to the air inlet pipe 7 (for example, through a pipe joint) and is connected; the air inlet pipe 7 is used to inject external cooling gas into the air passage 110 and compensate for the air pressure in the inner cavity of the completed pipe 3.

[0085] Cooling gas can be, for example, ambient air (the temperature of ambient air is lower than the temperature of the air at the inner side of the outer ring weld 30, the first electromagnetic support block 23, and the second electromagnetic support block 24); cooling gas can also be, for example, ambient air that has been cooled; cooling gas can also be, for example, low-temperature inert gas (e.g., carbon dioxide with a temperature below 10 degrees Celsius, stored in a gas storage cylinder).

[0086] Reference Figure 13 The end of the air inlet pipe 7 furthest from the central crossbar 21 is connected to and communicates with the air pump 71. The air pump 71 is connected to and communicates with the refrigerator 73 through the connecting pipe 72. The air pump 71 draws ambient temperature air into the refrigerator 73, and the refrigerator 73 lowers the temperature of the air. Then, the air pump 71 compresses the air into the air passage 110 and overflows from the air outlet to compensate for the starting end of the swirl 51.

[0087] The end of the air inlet pipe 7 away from the central crossbar 21 is connected to and communicates with the gas storage cylinder, which is equipped with a gas valve to control the timing and duration of the injection of low-temperature inert gas.

[0088] The end of the central crossbar 21 is sealed and fixedly connected to the center of the end face of the support body 11 (e.g., by bolts and sealing rings or by welding). The support body 11 has a cylindrical structure and is coaxially arranged with the central crossbar 21. The support body 11 is located at the center of the inner cavity of the completed pipe 3.

[0089] The end of the intake pipe 7 is placed inside the pipe 4 being installed. The intake pipe 7 is a flexible hose (such as a rubber hose) that is naturally pressed against the bottom of the inner cavity of the pipe under its own weight.

[0090] Reference Figure 14 , Figure 16 and Figure 17The pleats of the first telescopic sleeve 2344 are tilted and the tilt angle R1 is adapted to the tilt angle R0 of the axis of the first fan 5; the pleats of the second telescopic sleeve 2346 are tilted and the tilt angle R2 is adapted to the tilt angle R0 of the axis of the first fan 5; this is used to enable the vortex 51 to adapt to the concave part of the pleats of the first telescopic sleeve 2344 and the concave part of the pleats of the second telescopic sleeve 2346, thereby blowing off the dust particles adhering to the pleats (dust particles such as molten metal droplets; during welding, the pipe melts and produces molten metal droplets, which cool rapidly and produce metal particles; the high-pressure protective gas blows the molten metal droplets into the inner cavity of the pipe, and the metal particles fall into the pleats; the first telescopic sleeve 2344 and the second telescopic sleeve 2346 will frequently squeeze the metal particles when they extend and retract, causing the first telescopic sleeve 2344 and the second telescopic sleeve 2346 to break). If the first telescopic sleeve 2344 and the second telescopic sleeve 2346 need to be extended or retracted, then R1 and R2 are not fixed values; the adaptation referred to in this invention means that the first telescopic sleeve 2344 can be extended or shortened to a certain length state, in which state R0=R1; or the second telescopic sleeve 2346 can be extended or shortened to a certain length state, in which state R0=R2.

[0091] Reference Figure 14 and Figure 15 The traveling module 1 also includes support legs 12, moving wheels 13, and sealing plates 14. Several support legs 12 are radially arranged on the outer surface of the support body 11. One end of each support leg 12 is fixedly connected to the support body 11 (e.g., by bolts). The end of the support leg 12 away from the support body 11 is rotatably connected to the moving wheels 13 (e.g., by a shaft and bearing). The moving wheels 13 abut against the inner wall of the completed pipe 3. A first motor for driving the moving wheels 13 is installed inside the support body 11. The housing of the first motor is fixedly connected to the support body 11 by bolts. The first motor is connected to the moving wheels 13 located directly below the support body 11 via a transmission structure (e.g., a transmission chain and sprockets), thereby driving the traveling module 1 to move.

[0092] Reference Figure 15 A counterweight 111 is fixedly installed inside the support body 11 by bolts. The counterweight 111 has a horizontal columnar structure and a semi-circular cross-section. The counterweight 111 is a reinforced concrete structure. The counterweight 111 uses its own weight to press against the support body 11, meaning that the position of the counterweight 111 always points towards the ground, preventing the support body 11 from rotating around its own axis and improving the stability of the invention.

[0093] Reference Figure 15The sealing plate 14 is disposed between adjacent support legs 12, and the edge of the sealing plate 14 is sealed and fixedly connected to the support leg 12 (e.g., by welding or by bolts and sealing rings). The sealing plate 14 is used to increase the resistance of the cooling gas discharged from the air outlet of the air passage 110 in the direction of the traveling module 1, so that more cooling gas can form a swirling flow 51, increasing the flow rate and volume of the swirling flow 51, and improving the heat dissipation effect and efficiency.

[0094] Reference Figure 18 The foundation 6 is located at the bottom of the trench, and the pad 61 is located on the upper surface of the foundation 6. The pipe 4 being installed and the pipe 3 that has been completed are both pressed onto the pad 61; the upper surface of the pad 61 is provided with an arc-shaped groove, which is used to support and limit the pipes (including the pipe 4 being installed and the pipe 3 that has been completed), preventing the pipes from rolling off to the side.

[0095] A junction box is provided inside the support body 11, and the junction box is fixedly installed inside the support body 11 by bolts. The first linear actuator 26, the second linear actuator 232, the first electromagnetic support block 23, the second electromagnetic support block 24, the first distance sensor 2312, the second distance sensor 2412, the first fan 5, and the first motor are respectively connected to the junction box through power supply wires and / or first signal lines. The bottom of the outer surface of the central crossbar 21 is provided with a first conductor and a second signal line (e.g., connected by a wire clip and bolt). One end of the first conductor is connected to the junction box, and the other end is detachably connected to an external conductor (e.g., detachably connected by a plug-in terminal). One end of the second signal line is connected to the junction box, and the other end is detachably connected to an external signal line (e.g., detachably connected by a plug-in terminal). Both the external conductor and the external signal line are connected to the peripheral electrical box. The peripheral electrical box is connected to the external power supply. The peripheral electrical box is equipped with a controller (e.g., a computer or a PLC programmable logic controller). The controller is used to control the starting and stopping status of the first linear driver 26, the second linear driver 232, the first electromagnetic support block 23, the second electromagnetic support block 24, the first distance sensor 2312, the second distance sensor 2412, the first fan 5, and the first motor, and is used for the calculation of values ​​H1 and H2. The peripheral electrical box is equipped with a display screen to display the values ​​of H1, H2, and the calculation result of |H1-H2| in real time.

[0096] The first linear actuator 26 and the second linear actuator 232 are electric actuators, pneumatic actuators, hydraulic actuators, or combinations thereof (e.g., electro-hydraulic actuators). The first motor is a controllable motor (e.g., a servo motor or a stepper motor). By inputting electrical signals to the controllable motor through the controller, the speed and start / stop timing of the controllable motor can be controlled.

[0097] Reference Figure 19A special situation may occur during the alignment process between the completed pipe 3 and the pipe 4 being installed: During the swinging motion of the pipe 4 being installed, the outer wall end of the pipe 4 may abut against the inner wall end of the completed pipe 3, causing it to jam. At this point, applying further expansion force to the completed pipe 3 and / or the pipe 4 being installed will not overcome this jamming problem, meaning it is impossible to further align the first annular end face 31 and the second annular end face 41 coaxially. To avoid this problem: Refer to... Figure 20 An L-shaped telescopic rod 2313 is installed on the end of the first side extension block 2311 near the end of the second electromagnetic support block 24. The top of the telescopic rod 2313 is provided with a hook 2314 that can extend elastically. When the first electromagnetic support block 23 moves away from the second electromagnetic support block 24, the hook 2314 can abut against the second annular end face 41 and push the pipe 4 being installed to move away from the completed pipe 3, so that the end of the pipe 4 being installed is pulled out from the inner cavity of the completed pipe 3.

[0098] Reference Figures 20-22 The telescopic pole 2313 includes a horizontal bar 23131 and a vertical bar 23132 that are fixedly connected in an L-shape; the horizontal bar 23131 and the vertical bar 23132 are fixedly connected by bolts or by an integral fixed connection. The horizontal bar 23131 is arranged along the axial direction of the central horizontal bar 21, and the vertical bar 23132 is arranged along the radial direction of the central horizontal bar 21. The end of the horizontal bar 23131 away from the vertical bar 23132 is inserted into the first side extension block 2311 and can extend elastically. The hook 2314 is inserted into the end of the vertical bar 23132 away from the horizontal bar 23131 and can extend elastically. The end of the vertical bar 23132 away from the horizontal bar 23131 is provided with an inclined guide slope (the end of the guide slope near the first electromagnetic support block 23 is set to extend outward along the central horizontal bar 21 axially; the end of the guide slope near the second electromagnetic support block 24 is set to converge inward along the central horizontal bar 21 axially). After the first annular end face 31 and the second annular end face 41 are aligned and pressed together, when the hook 2314 moves towards the second electromagnetic support block 24, the tip of the hook 2314 needs to pass through the connection position of the first annular end face 31 and the second annular end face 41. The guide slope is used to prevent the hook 2314 from being stuck at this time.

[0099] Reference Figure 21The first side extension block 2311 has a first insertion hole 23111 inside. The end of the crossbar 23131 away from the vertical bar 23132 is inserted into the first insertion hole 23111 and is slidably disposed. A first stop step 23112 is provided in the middle of the inner wall of the first insertion hole 23111. A first retaining ring 23113 is fixedly installed in the middle of the outer surface of the crossbar 23131 (for example, by bolt connection). A first compression spring 23114 is sleeved on the outer surface of the crossbar 23131. One end of the first compression spring 23114 is pressed against the first retaining ring 23113, and the other end is pressed against the first stop step 23112. The first compression spring 23114 and the first retaining ring 23113 are both placed in the first insertion hole 23111. The first insertion hole 23111 has a ring-shaped first end cap 23115 (e.g., detachably connected by bolts) at its end. The first end cap 23115 is sleeved on the outer periphery of the crossbar 23131. The first end cap 23115 is used to laterally abut against the first retaining ring 23113, thereby preventing the retaining ring and the crossbar 23131 from coming out of the first insertion hole 23111.

[0100] Reference Figure 20 When the first electromagnetic support block 23 moves toward the second electromagnetic support block 24, the vertical rod 23132 abuts against the end of the second side extension block 2411; when the first electromagnetic support block 23 continues to move toward the second electromagnetic support block 24, the first compression spring 23114 is compressed and contracts, and the horizontal rod 23131 retracts into the first insertion hole 23111, thereby increasing the movable distance of the first electromagnetic support block 23. When the first electromagnetic support block 23 moves away from the second electromagnetic support block 24, the first compression spring 23114 rebounds and the moving crossbar 23131 extends outward until the first retaining ring 23113 abuts against the first end cap 23115; when the first electromagnetic support block 23 continues to move away from the second electromagnetic support block 24, the first electromagnetic support block 23, the telescopic rod 2313 and the hook 2314 move synchronously away from the completed pipe 3, so that the hook 2314 abuts against the second annular end face 41 and pushes the end of the pipe 4 being installed to be pulled out from the inner cavity of the completed pipe 3.

[0101] Reference Figure 21 and Figure 22The vertical bar 23132 has a second insertion hole 23135 at its end away from the horizontal bar 23131. The end of the hook 2314 near the central horizontal bar 21 is inserted into the second insertion hole 23135 and slidably connected. A second stop step 23136 is provided on the inner wall of the second insertion hole 23135. A second retaining ring 23138 is provided in the middle of the outer surface of the hook 2314 (e.g., fixed by bolts or by an integral fixed connection). A second compression spring 23137 is sleeved on the outer surface of the hook 2314. One end of the second compression spring 23137 is pressed against the second stop step 23136, and the other end is pressed against the second retaining ring 23138. The hook 2314 can extend and retract by moving radially along the central horizontal bar 21. Figure 20 The distance between the second annular end face 41 and the center line crossbar 23131 is less than the distance between the first electromagnetic support block 23 and the center crossbar 21. Therefore, when the first electromagnetic support block 23, the telescopic rod 2313 and the hook 2314 move synchronously toward the second electromagnetic support block 24, the hook 2314 is pressed against the inner wall of the pipe 4 being installed and retracts. When the hook 2314 passes the position of the second annular end face 41, it extends under the pushing action of the second compression spring 23137. Then, when the hook 2314 moves away from the second electromagnetic support block 24, it can stably press against the second annular end face 41 from the side, avoiding slippage between the hook 2314 and the second annular end face 41, improving the reliability of the pressing, and thus being able to apply a thrust to the pipe 4 being installed.

[0102] Reference Figure 22 The second insertion hole 23135 has a second end cap 23139 (e.g., detachably connected by bolts) at its end. The second end cap 23139 is annularly fitted around the outer periphery of the hook 2314. The hook 2314 has a rectangular cross-section, and the second insertion hole 23135 has a rectangular cross-section that fits the outer surface of the hook 2314, thereby preventing the hook 2314 from rotating. The crossbar 23131 has a rectangular cross-section, and the first insertion hole 23111 has a rectangular cross-section that fits the outer surface of the crossbar 23131, thereby preventing the crossbar 23131 from rotating.

[0103] Reference Figure 21A reinforcing diagonal brace 23133 is provided at the connection position of the horizontal bar 23131 and the vertical bar 23132, thereby increasing the structural strength of the vertical connection position of the horizontal bar 23131 and the vertical bar 23132 and preventing the horizontal bar 23131 and the vertical bar 23132 from separating. The top end of the reinforcing diagonal brace 23133 is fixedly connected to the outer surface of the vertical bar 23132 (e.g., by welding or by bolts), and the bottom end of the reinforcing diagonal brace 23133 is fixedly connected to the outer surface of the horizontal bar 23131 (e.g., by welding or by bolts). A ventilation hole 23134 is formed between the horizontal bar 23131, the vertical bar 23132 and the reinforcing diagonal brace 23133 for the swirling flow 51 to pass through (if a reinforcing diagonal plate is used instead of the reinforcing diagonal brace 23133, the swirling flow 51 will form turbulence when it hits the reinforcing diagonal plate, resulting in a decrease in the cooling effect on the outer ring weld 30 and the first electromagnetic support block 23 and the second electromagnetic support block 24). Ventilation holes 23134 have a triangular structure.

[0104] A method for welding municipal pipelines involves aligning the pipeline 4 being installed and the pipeline 3 that has been completed with a municipal pipeline welding support and positioning device before welding. The steps include:

[0105] S1. Disconnect the first wire from the external wire, and then pull the external wire (out of the completed pipe 3 cavity); disconnect the second signal wire from the external signal wire, and then pull the external signal (out of the completed pipe 3 cavity).

[0106] S2. Hoist the pipe 4 that is being installed and place it on the pad 61 of the foundation 6.

[0107] S3. Insert the external wire into the inner cavity of the pipe 4 being installed and connect it to the first wire; then insert the external signal wire into the inner cavity of the pipe 4 being installed and connect it to the second signal wire.

[0108] S4. Control the expansion module 2 to contract, and then control the traveling module 1 to move towards the pipe 4 being installed, until the first annular end face 31 and the second annular end face 41 are both fitted onto the outer periphery of the expansion module 2 (when the expansion module 2 expands, the first electromagnetic support block 23 and the second electromagnetic support block 24 will have axial displacement along the central crossbar 21; at this time, it is necessary to start the traveling module 1 to push the expansion module 2 to move laterally to compensate for the displacement of the first electromagnetic support block 23 and the second electromagnetic support block 24, so that the position where the first annular end face 31 and the second annular end face 41 press against each other is located in the middle of the concave gap 230; the user can observe the status and position of the expansion module 2 in real time with the naked eye through the first gap 40; if necessary, another user can use a flashlight to shine into the inner cavity of the pipe to supplement the light, thereby improving the clarity of the observer's field of vision).

[0109] S5. Control the expansion module 2 to expand, pushing the first annular end face 31 and the second annular end face 41 to be coaxially aligned.

[0110] S6. The first electromagnetic support block 23 is attached to the inner wall of the pipe 4 being installed, and the second electromagnetic support block 24 is attached to the inner wall of the pipe 3 after construction is completed; then the first electromagnetic support block 23 moves towards the second electromagnetic support block 24, so that the first annular end face 31 and the second annular end face 41 fit together.

[0111] S7. Insert the intake pipe 7 into the pipe 4 being installed and connect it to the center crossbar 21.

[0112] S8. Weld the outer wall of the joint between the pipe 4 being installed and the pipe 3 that has been completed to obtain the outer ring weld 30.

[0113] S9. Start the first fan 5 to form a vortex 51, and at the same time, deliver cooling gas to the starting end of the vortex 51 through the air inlet pipe 7 to cool the outer ring weld 30.

[0114] S10. Disconnect the air intake pipe 7 from the central crossbar 21, and then pull the air intake pipe 7 out of the inner cavity of the completed pipe 3 (the pipe 4 that was originally being installed has now become the completed pipe 3).

[0115] Reference Figure 19 If the outer wall end of the pipe 4 being installed gets stuck against the inner wall end of the completed pipe 3, then step S5 further includes the following steps:

[0116] S51. Control the expansion module 2 to expand until a certain first electromagnetic support block 23 abuts (i.e., the first electromagnetic support block 23 closest to the snap-fit ​​position) on the inner wall of the pipe 4 being installed (this can be determined by the reading of H1 on the display), and then the expansion module 2 stops expanding.

[0117] S52, the first linear actuator 26 drives the first electromagnetic support block 23, the first connecting block 231, the first side extension block 2311, the telescopic rod 2313 and the hook 2314 to move synchronously in the direction of the second electromagnetic support block 24, so that the hook 2314 is located on the side of the second annular end face 41 close to the second electromagnetic support block 24 (the user can judge by listening to the sound: the moment the hook 2314 crosses the second annular end face 41, the hook 2314 extends outward, the second retaining ring 23138 hits the second end cover 23139 and makes a sound).

[0118] S53, the first linear actuator 26 drives the first electromagnetic support block 23, the first connecting block 231, the first side extension block 2311, the telescopic rod 2313 and the hook 2314 to move synchronously away from the second electromagnetic support block 24, so that the hook 2314 laterally abuts against the second annular end face 41 and pushes the end of the pipe 4 being installed to be pulled out from the inner cavity of the completed pipe 3.

[0119] S54, the expansion module 2 continues to expand until the first annular end face 31 and the second annular end face 41 are coaxially aligned (refer to...). Figure 7 Then, expansion module 2 stops expanding.

[0120] After the entire pipeline is welded, concrete is poured around the outside of the completed pipeline 3. After the concrete hardens, a foundation is formed. The top surface of the foundation is flush with the central axis of the pipeline. (The construction precision of the foundation 6 and the pad 61 is not sufficient to match the welding precision of the pipeline. The pipeline needs to be swung during alignment, which will result in irregular gaps between the pad 61 and the pipeline. Pouring concrete can fill these gaps, giving the entire pipeline a higher load-bearing capacity and stability.)

[0121] The present invention has a simple structure and reliable function. The first electromagnetic support block 23 and the second electromagnetic support block 24 respectively abut against the pipe 4 being installed and the pipe 3 that has been completed from the inside. There is an inner recessed gap 230 between the first electromagnetic support block 23 and the second electromagnetic support block 24. The outer ring weld 30 is located in the middle of the inner recessed gap 230. That is, the first electromagnetic support block 23 and the second electromagnetic support block 24 are located on both sides of the outer ring weld 30, which can prevent the outer ring weld 30 from sticking to the first electromagnetic support block 23 / second electromagnetic support block 24 when the weld is burned through.

Claims

1. A municipal pipeline welding support and positioning device, characterized in that: It includes a travel module (1) and an expansion module (2) disposed at the end of the travel module (1); The expansion module (2) includes a central crossbar (21), a movable crossbar (22), a first electromagnetic support block (23), and a second electromagnetic support block (24). The movable crossbar (22) is disposed on the outer periphery of the central crossbar (21), and the distance between the movable crossbar (22) and the central crossbar (21) is adjustable. The surface of the movable crossbar (22) away from the central crossbar (21) is a mounting surface. The first electromagnetic support block (23) is disposed at the end of the mounting surface away from the traveling module (1), and the second electromagnetic support block (24) is disposed at the end of the mounting surface close to the traveling module (1). The expansion module (2) can expand until the first electromagnetic support block (23) abuts against and pushes the inner wall of the pipe (4) being installed, and the second electromagnetic support block (24) abuts against the inner wall of the pipe (3) that has been constructed, so that the first annular end face (31) of the pipe (4) being installed and the second annular end face (41) of the pipe (3) that has been constructed are coaxially arranged. A concave gap (230) is provided between the first electromagnetic support block (23) and the second electromagnetic support block (24); an outer ring weld (30) is provided in the middle of the concave gap (230) to avoid the first electromagnetic support block (23) and / or the second electromagnetic support block (24) from sticking together. The first electromagnetic support block (23) can magnetically adsorb the inner wall of the pipe (4) being installed, and the second electromagnetic support block (24) can magnetically adsorb the inner wall of the pipe (3) after construction is completed; the first electromagnetic support block (23) can move axially along the central crossbar (21) to drive the first annular end face (31) and the second annular end face (41) to approach and fit together.

2. The municipal pipeline welding support and positioning device according to claim 1, characterized in that: A first connecting block (231) is provided between the first electromagnetic support block (23) and the movable horizontal plate (22); a second connecting block (241) is provided between the second electromagnetic support block (24) and the movable horizontal plate (22).

3. The municipal pipeline welding support and positioning device according to claim 2, characterized in that: The expansion module (2) further includes a diagonal brace (25) and a first linear actuator (26); one end of the diagonal brace (25) is rotatably connected to the central crossbar (21) and the other end is rotatably connected to the movable crossbar (22); one end of the first linear actuator (26) is rotatably connected to the central crossbar (21) and the other end is rotatably connected to the movable crossbar (22).

4. The municipal pipeline welding support and positioning device according to claim 3, characterized in that: The movable horizontal plate (22) is arranged parallel to the central horizontal bar (21); the movable horizontal plate (22), the central horizontal bar (21) and the diagonal bracing rod (25) form a parallelogram structure.

5. The municipal pipeline welding support and positioning device according to claim 4, characterized in that: The vertical distance between the first electromagnetic support block (23) and the central crossbar (21) is equal to the vertical distance between the second electromagnetic support block (24) and the central crossbar (21); a first distance sensor (2312) is provided on the side of the first connecting block (231), and a second distance sensor (2412) is provided on the side of the second connecting block (241). The first connecting block (231), the second connecting block (241), the first distance sensor (2312) and the second distance sensor (2412) are arranged in a linear array along the axial direction of the central crossbar (21); the vertical distance between the first distance sensor (2312) and the central crossbar (21) is equal to the vertical distance between the second distance sensor (2412) and the central crossbar (21).

6. The municipal pipeline welding support and positioning device according to claim 5, characterized in that: The traveling module (1) is provided with a first fan (5) near the end of the expansion module (2). The first fan (5) can blow to form a vortex (51), which is discharged through the inner cavity of the pipe (4) being installed. The vortex (51) can flow in an inclined manner through the concave gap (230) and cool the outer ring weld (30), the first electromagnetic support block (23) and the second electromagnetic support block (24). The traveling module (1) includes a support body (11), and the support body (11) is provided with an air passage (110); the air passage (110) includes an air inlet and an air outlet, and the air outlet is located on the side of the first fan (5) away from the expansion module (2); the central crossbar (21) has a hollow structure, and the air inlet is connected to one end of the inner cavity of the central crossbar (21); the end of the central crossbar (21) away from the traveling module (1) is connected to and communicates with the air inlet pipe (7); the air inlet pipe (7) is used to inject external cooling gas into the air passage (110) and compensate for the air pressure in the inner cavity of the completed pipeline (3); The end of the air intake pipe (7) is placed inside the pipe (4) being installed.

7. The municipal pipeline welding support and positioning device according to claim 6, characterized in that: The first connecting block (231) is connected to a base plate (233) at its end. The base plate (233) is connected to the movable cross plate (22) through a slide rail assembly (234). The slide rail assembly (234) is fitted with a first telescopic sleeve (2344) and a second telescopic sleeve (2346) on its outer periphery. The first telescopic sleeve (2344) is pleated and tilted at an angle that is adapted to the tilt angle of the axis of the first fan (5); The second telescopic sleeve (2346) is pleated and tilted, and the tilt angle is adapted to the tilt angle of the axis of the first fan (5).

8. The municipal pipeline welding support and positioning device according to claim 7, characterized in that: The traveling module (1) further includes support legs (12), moving wheels (13), and sealing plates (14); the support legs (12) are arranged radially on the outer surface of the support body (11); the ends of the support legs (12) away from the support body (11) are connected to the moving wheels (13); the sealing plates (14) are arranged between adjacent support legs (12); the support body (11) is provided with a first motor for driving the moving wheels (13) to rotate.

9. The municipal pipeline welding support and positioning device according to claim 8, characterized in that: The support body (11) is provided with a junction box; the bottom of the outer surface of the central crossbar (21) is provided with a first wire, one end of which is connected to the junction box and the other end is detachably connected to an external wire.

10. A method for welding municipal pipes, characterized in that, The municipal pipeline welding support and positioning device as described in claim 9 is used to align the pipeline (4) being installed and the pipeline (3) that has been completed before welding. The steps include: S1. Disconnect the first wire from the external wire, and then pull out the external wire; S2. Hoist the pipe (4) being installed and place it on the pad (61) of the foundation (6); S3. Insert the external wire into the inner cavity of the pipe (4) being installed and connect it to the first wire; S4. The expansion module (2) contracts, and then the traveling module (1) moves toward the pipe (4) being installed, until the first annular end face (31) and the second annular end face (41) are both fitted around the outer periphery of the expansion module (2); S5. The expansion module (2) expands so that the first annular end face (31) and the second annular end face (41) are coaxially arranged; S6. The first electromagnetic support block (23) is adsorbed on the inner wall of the pipe (4) being installed, and the second electromagnetic support block (24) is adsorbed on the inner wall of the pipe (3) after construction is completed; then the first electromagnetic support block (23) moves towards the second electromagnetic support block (24) so ​​that the first annular end face (31) and the second annular end face (41) fit together. S7. Insert the air intake pipe (7) into the pipe (4) being installed and connect it to the central crossbar (21); S8. Weld the outer wall of the pipe (4) being installed and the pipe (3) that has been completed to obtain the outer ring weld (30). S9. Start the first fan (5) to form a vortex (51), and at the same time, transport the cooling gas to the starting position of the vortex (51) through the air inlet pipe (7) to cool the outer ring weld (30).

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