A welding device for municipal road pipeline laying

Abstract

The application discloses a kind of municipal road pipeline laying welding device, specifically relates to pipeline welding technical field, including mobile base, the upper end of mobile base is provided with positioning assembly, the middle position of two positioning assemblies is provided with rotary welding assembly, the upper end of mobile base is provided with polishing assembly, the right end of rotary welding assembly is provided with blowing assembly, the front and rear sides of mobile base are provided with support assembly one.The application realizes the synchronous processing of the butt joint positioning, polishing, cleaning and welding of two steel pipes without removing the positioning assembly, effectively reduces the gap deviation at the steel pipe interface, creates a good foundation for welding, and removes the impurities and unevenness on the interface surface, so that the weld can better fuse, while also timely removing the debris to avoid impurities mixing into the weld, significantly improves the construction efficiency, reduces labor intensity and labor cost.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline welding, in particular to a welding device for laying municipal road pipelines. Background Art

[0002] In municipal road construction, pipeline laying is a crucial engineering link, involving the installation of various types of pipelines such as water supply and drainage pipelines, gas pipelines, and communication cable pipelines. The quality of the connection between pipelines is directly related to the operational stability, safety, and service life of the entire pipeline system. At present, at the welding construction site of municipal road pipelines, it is necessary to first use a jointer to align the two pipe interfaces, and then use a welding device to weld four points for limiting, and then remove the jointer and perform welding manually. The whole process is very complicated and labor-intensive, and it is difficult to meet the needs of modern engineering construction.

[0003] Chinese patent publication number CN221363390U discloses a thermal pipeline construction welding device, comprising a workbench, wherein a welding mechanism and a fixing mechanism are respectively provided at the top of the workbench; the welding mechanism comprises an L-shaped plate, which is arranged in the middle of the top of the workbench, and a welding head is provided on the inner wall of the top of the L-shaped plate; the fixing mechanism comprises a fixing block, which is arranged in the middle of the top of the workbench, and a first through-slot is opened inside the fixing block, and a connecting pipe is rotatably provided inside the first through-slot, and the connecting pipe passes through the fixing block, and a first gear is provided on the surface of the connecting pipe, and a fixing plate is provided inside the connecting pipe, and a clamping plate is provided on the fixing plate via a spring; the beneficial effect of the utility model is that when welding the thermal pipeline, the worker can drive the thermal pipeline to rotate by a motor, so as to change the welding point of the thermal pipeline, increase the welding area of ​​the thermal pipeline, and ensure the quality of the thermal pipeline welding;

[0004] However, in the prior art, when welding steel pipes at a pipeline laying construction site, it is impossible to simultaneously perform processes such as docking, positioning, and welding on the ends of two steel pipes. Summary of the Invention

[0005] The main purpose of the present invention is to provide a welding device for laying municipal road pipelines, which can effectively solve the problem of being unable to simultaneously perform docking, positioning and welding processes on steel pipes.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A welding device for laying municipal road pipelines includes a mobile base, a through groove is opened at the upper end of the mobile base, a positioning assembly is provided at the upper end of the mobile base, a rotary welding assembly is provided in the middle position of the two positioning assemblies, a grinding assembly is provided at the upper end of the mobile base, a blowing assembly is provided at the right end of the rotary welding assembly, support assembly 1 is provided on the front and rear sides of the mobile base, and support assembly 2 is provided on the left and right sides of the two support assemblies 1.

[0008] Preferably, the positioning assembly includes a fixed block 1 fixedly connected to the front and rear sides of the upper end of the movable base, the upper ends of the two fixed blocks 1 are fixedly installed with hydraulic devices, the left and right sides of the upper end of the movable base are fixedly connected to a support frame 1, the front and rear sides of the two support frames 1 close to each other are commonly fixedly connected to a connecting frame 1, the output ends of the two hydraulic devices pass through the inner surfaces of the two connecting frames 1, the output ends of the two hydraulic devices are fixedly connected to a connecting frame 2, and the left and right ends of the two connecting frames 2 distributed front and back are commonly fixedly connected to a support frame 2.

[0009] Preferably, the surfaces of the two support frames that are close to each other are provided with a plurality of mounting blocks in a circular array, and the interiors of the plurality of mounting blocks are all threadedly connected with threaded positioning bolts.

[0010] Preferably, the rotary welding assembly includes a motor fixedly mounted inside the movable base, the output end of the motor is fixedly connected to gear 1, the upper end of the movable base is fixedly connected to support base 1, the upper end of the movable base and the right end of support base 1 is fixedly connected to support base 2, the outer surfaces of support base 1 and support base 2 are jointly slidably connected to an annular gear frame, annular limit grooves are provided at the left and right ends of the annular gear frame, the outer surface of gear 1 is meshed with the annular gear frame, and a laser welding head is fixedly mounted on the inner surface of the annular gear frame.

[0011] Preferably, the grinding assembly includes an annular rack fixedly connected to the upper end of the support base, the outer surface of the annular rack is meshed with gear 2, the lower end of gear 2 is rotatably connected to the inner surface of the annular gear frame, the upper end of gear 2 is fixedly connected to a telescopic rod, and the upper end of the telescopic rod is fixedly connected to a grinding block.

[0012] Preferably, the blowing assembly includes an annular frame fixedly connected to the upper end of the supporting base 2, a limiting groove is provided on a side of the annular frame close to the annular gear frame, an arc-shaped air bag is provided inside the annular frame, the inner surface of the annular gear frame and the side of the gear 2 are fixedly connected with a connecting block, the outer surface of the connecting block is slidably connected to the limiting groove, the inner surface of the connecting block is slidably connected to a sliding block, the end of the sliding block away from the connecting block is fixedly connected to an extrusion plate, the outer surface of the extrusion plate is fixedly connected to one end of the arc-shaped air bag, and a one-way valve is provided on the end of the arc-shaped air bag close to the extrusion plate, and the one-way valve passes through the inner surface of the extrusion plate.

[0013] Preferably, the end of the arc-shaped airbag away from the extrusion plate is fixedly connected to the inner surface of the annular frame, the lower end of the extrusion plate is fixedly connected to a limiting bead, the inner surface of the annular frame is provided with an arc groove, and the outer surface of the limiting bead is slidably connected to the arc groove.

[0014] Preferably, the support assembly 1 includes a fixed block 2 fixedly connected to the front end of the two support frames 2, the lower end of the fixed block 2 is fixedly connected to two pressure rollers, the left and right ends of the movable base are fixedly connected to fixed seats, the upper ends of the two fixed seats are fixedly connected to rotating seats, and the outer surfaces of the two rotating seats are rotatably connected to swing seats.

[0015] Preferably, the ends of the two swing seats that are away from each other are slidably connected to adjustment blocks, the upper sides of the ends of the two swing seats that are close to each other are provided with card grooves, the inner surfaces of the two card grooves are slidably connected to the two pressure rollers, the upper ends of the two fixed seats are fixedly connected to limiting columns, the outer surfaces of the two limiting columns are slidably connected to sliding seats, and the ends of the two sliding seats that are away from each other are fixedly connected to connecting seats.

[0016] Preferably, the second support assembly includes a support seat fixedly connected to two connecting seats on the same side, the upper end of the support seat is fixedly connected to a plurality of springs, and the upper ends of the plurality of springs are fixedly connected to a buffer plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention realizes the simultaneous processing of docking positioning, grinding, cleaning and welding of two steel pipes through the coordination between various components without removing the positioning components, effectively reducing the gap deviation at the steel pipe interface, creating a good foundation for welding, and removing impurities and unevenness on the interface surface, so that the weld can be better integrated. At the same time, waste chips are removed in time to avoid impurities from mixing into the weld, which significantly improves construction efficiency and reduces labor intensity and labor costs.

[0019] 2. The present invention cooperates with the rotary welding component and the grinding component to grind the connection between the two steel pipes before welding, quickly remove impurities and rust at the pipe interface, and synchronously drives the blowing component on one side during the rotation to blow away the waste chips generated during grinding, thereby removing the waste chips in time and ensuring the cleanliness of the pipe interface to prevent it from affecting the subsequent welding quality. Finally, the treated steel pipe is rotated in the opposite direction to weld, which improves the overall work efficiency, shortens the project cycle, and reduces labor costs and equipment losses.

[0020] 3. The present invention cooperates with the positioning component and the support component 1, and drives the support components 2 on both sides to be lifted synchronously when the support frame 1 and the support frame 2 approach each other, thereby providing stable supporting force for the bottoms of both sides of the two steel pipes. It not only takes into account the lateral alignment of the pipelines, but also takes into account the stability of the pipelines in the vertical direction, ensuring that the pipelines are always in a stable state during the welding process, and effectively reducing weld defects caused by pipeline instability, such as weld cracks, lack of fusion and other problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a structural schematic diagram of the positioning assembly of the present invention;

[0023] Figure 3 It is a partial structural schematic diagram of the rotary welding assembly of the present invention;

[0024] Figure 4 Schematic diagram of the structure of the annular limiting groove of the present invention;

[0025] Figure 5 It is a structural schematic diagram of the rotary welding assembly of the present invention;

[0026] Figure 6 It is a structural schematic diagram of the grinding assembly of the present invention;

[0027] Figure 7 It is a structural schematic diagram of the annular frame of the present invention;

[0028] Figure 8 Schematic diagram of the internal structure of the ring frame of the present invention;

[0029] Figure 9 It is a partial structural schematic diagram of the blowing assembly of the present invention;

[0030] Figure 10 It is a structural schematic diagram of the support assembly 1 of the present invention;

[0031] Figure 11 This is a schematic structural diagram of another state of the support assembly 1 of the present invention;

[0032] Figure 12 It is a structural schematic diagram of a part of the support assembly of the present invention.

[0033] In the figure: 1. Mobile base; 11. Through slot; 2. Positioning assembly; 21. Fixed block 1; 22. Hydraulic device; 23. Support frame 1; 231. Connecting frame 1; 24. Support frame 2; 241. Connecting frame 2; 25. Mounting block; 26. Threaded positioning bolt; 3. Rotary welding assembly; 31. Motor; 32. Gear 1; 33. Ring gear frame; 331. Ring limit groove; 34. Support base 1; 35. Support base 2; 36. Laser welding head; 4. Grinding assembly; 41. Ring rack; 42. Gear 2; 43. Telescopic rod; 4 4. Grinding block; 5. Blowing assembly; 51. Ring frame; 511. Limiting groove; 52. Arc-shaped airbag; 53. Connecting block; 531. Sliding block; 54. Extrusion plate; 541. Limiting bead; 55. One-way valve; 56. Arc-shaped groove; 6. Support assembly one; 61. Fixed block two; 62. Pressing roller; 63. Fixed seat; 64. Rotating seat; 65. Swinging seat; 651. Adjusting block; 652. Slot; 66. Limiting column; 67. Sliding seat; 68. Connecting seat; 7. Support assembly two; 71. Support seat; 72. Spring; 73. Buffer plate. DETAILED DESCRIPTION

[0034] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0035] Example 1, as Figure 1-2 As shown, a welding device for laying municipal road pipelines includes a mobile base 1, a through groove 11 is opened at the upper end of the mobile base 1, a positioning component 2 is provided at the upper end of the mobile base 1, a rotary welding component 3 is provided in the middle position of the two positioning components 2, a grinding component 4 is provided at the upper end of the mobile base 1, a blowing component 5 is provided at the right end of the rotary welding component 3, support components 1 6 are provided on the front and rear sides of the mobile base 1, and support components 2 7 are provided on the left and right sides of the two support components 1 6.

[0036] Therefore, this solution achieves the simultaneous processing of docking positioning, grinding, cleaning and welding of two steel pipes through the cooperation between various components without removing the positioning component 2, effectively reducing the gap deviation at the steel pipe interface, creating a good foundation for welding, and removing impurities and unevenness on the interface surface, so that the weld can be better integrated. At the same time, waste chips are removed in time to avoid impurities from mixing into the weld, which significantly improves construction efficiency and reduces labor intensity and labor costs.

[0037] Embodiment 2: Based on embodiment 1, this embodiment is to achieve the effect of simultaneously grinding and cleaning the steel pipe before welding.

[0038] See Figure 1-9 The positioning assembly 2 includes a fixed block 21 fixedly connected to the front and rear sides of the upper end of the mobile base 1, and a hydraulic device 22 is fixedly installed on the upper ends of the two fixed blocks 21. The left and right sides of the upper end of the mobile base 1 are fixedly connected to a support frame 23, and the front and rear sides of the two support frames 23 close to each other are commonly fixedly connected to a connecting frame 231. The output ends of the two hydraulic devices 22 pass through the inner surfaces of the two connecting frames 231, and the output ends of the two hydraulic devices 22 are fixedly connected to a connecting frame 241. The left and right ends of the two connecting frames 241 distributed front and back are commonly fixedly connected to the support frame 24.

[0039] A plurality of mounting blocks 25 are arranged in a circular array on the surfaces of the two support frames 24 that are close to each other. The interiors of the plurality of mounting blocks 25 are all threadedly connected with threaded positioning bolts 26 .

[0040] Specifically, the support frame 1 23 and the support frame 2 24 can clamp and position the steel pipe;

[0041] Furthermore, the device is moved as a whole to one end of the pipe to be welded, and then passed through the pipe and moved to the connection point of the two pipes. Then, the fixing block 1 21 is started to drive the upper connecting frame 2 241 and the supporting frame 2 24 to descend, so that the supporting frame 1 23 and the supporting frame 2 24 firmly clamp the ports of the two pipes and align them. Then, several threaded positioning bolts 26 are rotated so that they all press against the pipes to prevent the connection point of the two pipes from being offset.

[0042] In the laying of municipal road pipelines, accurate alignment of pipeline interfaces is crucial for subsequent welding and the normal operation of the entire pipeline system, and can effectively reduce the occurrence of problems such as leakage.

[0043] See Figure 3-5 The rotary welding assembly 3 includes a motor 31 fixedly installed inside the mobile base 1, the output end of the motor 31 is fixedly connected to a gear 1 32, the upper end of the mobile base 1 is fixedly connected to a support base 1 34, the upper end of the mobile base 1 and the right end of the support base 1 34 is fixedly connected to a support base 2 35, the outer surfaces of the support base 1 34 and the support base 2 35 are slidably connected to an annular gear frame 33, and an annular limit groove 331 is provided at both ends of the annular gear frame 33, the outer surface of the gear 1 32 is meshed with the annular gear frame 33, and the inner surface of the annular gear frame 33 is fixedly installed with a laser welding head 36.

[0044] Furthermore, the annular limit groove 331 on the left side of the annular gear frame 33 is slidably connected to the outer surface of the support base 1 34, and the annular limit groove 331 on the right side of the annular gear frame 33 is slidably connected to the support base 2 35. The two ensure that the annular gear frame 33 can rotate stably as a whole, and can drive the laser welding head 36 to rotate together during the rotation process.

[0045] Furthermore, the laser welding head 36 belongs to the existing technology. The laser welding head 36 is electrically connected to the terminal control system in the existing technology. When welding the connection between two steel pipes, the terminal control system will drive the laser welding head 36 to actively approach the weld between the two steel pipes, and then continuously output high-energy laser beams focused on the connection between the steel pipes, so that the metal in this area quickly absorbs the laser energy and reaches the melting point or even boiling point. The metal melts to form a molten pool. As the laser welding head 36 rotates around the steel pipe, the molten pool continues to expand forward, and then cools and solidifies, thereby firmly connecting the two steel pipes together to form a continuous weld.

[0046] See Figure 5-6 The grinding assembly 4 includes an annular rack 41 fixedly connected to the upper end of the support base 34, the outer surface of the annular rack 41 is meshed with a gear 2 42, the lower end of the gear 2 42 is rotatably connected to the inner surface of the annular gear frame 33, the upper end of the gear 2 42 is fixedly connected to a telescopic rod 43, and the upper end of the telescopic rod 43 is fixedly connected to a grinding block 44.

[0047] Furthermore, the telescopic rod 43 is electrically connected to the terminal control system, and the distance between the grinding block 44 and the steel pipe can be controlled according to different situations.

[0048] Then, according to the terminal control system, the telescopic rod 43 is started to drive the grinding block 44 to fit the connection between the two steel pipes, and then the motor 31 is started to rotate the gear 1 32, the gear 1 32 is meshed with the annular gear frame 33, and the annular gear frame 33 rotates. During the rotation, the annular gear frame 33 drives the gear 2 42, the telescopic rod 43 and the grinding block 44 to rotate together, so that the gear 2 42 is meshed with the annular rack 41 on the left, and the gear 2 42, the telescopic rod 43 and the grinding block 44 rotate rapidly, grinding the outer surface of the connection between the two steel pipes, quickly removing impurities, rust, etc. at the pipeline interface, and providing good surface conditions for subsequent welding.

[0049] See Figure 5-9The blowing assembly 5 includes an annular frame 51 fixedly connected to the upper end of the supporting base 2 35, and a limiting groove 511 is provided on the side of the annular frame 51 close to the annular gear frame 33. An arc-shaped airbag 52 is provided inside the annular frame 51, and a connecting block 53 is fixedly connected to the inner surface of the annular gear frame 33 and located on one side of the gear 2 42. The outer surface of the connecting block 53 is slidably connected to the limiting groove 511, and the inner surface of the connecting block 53 is slidably connected to the sliding block 531. The end of the sliding block 531 away from the connecting block 53 is fixedly connected to the extrusion plate 54, and the outer surface of the extrusion plate 54 is fixedly connected to one end of the arc-shaped airbag 52. A one-way valve 55 is provided on the end of the arc-shaped airbag 52 close to the extrusion plate 54, and the one-way valve 55 passes through the inner surface of the extrusion plate 54.

[0050] Furthermore, the arc-shaped airbag 52 is arc-shaped, and its overall length is one section longer than a full circle, so that the extrusion plate 54 can rotate a full circle along with the grinding block 44, and the arc-shaped airbag 52 can blow air when grinding an entire steel pipe, wherein the one-way valve 55 can only let air out but not let air in.

[0051] The end of the arc-shaped airbag 52 away from the extrusion plate 54 is fixedly connected to the inner surface of the annular frame 51, and the lower end of the extrusion plate 54 is fixedly connected to the limiting bead 541. The inner surface of the annular frame 51 is provided with an arc-shaped groove 56, and the outer surface of the limiting bead 541 is slidably connected to the arc-shaped groove 56.

[0052] Furthermore, the arc shape of the arc groove 56 is consistent with the arc shape of the arc airbag 52. Because the arc airbag 52 is a little more than a full circle of arc, there are staggered parts, that is, position deviations. Therefore, when the extrusion plate 54 extrude the arc airbag 52, the limiting bead 541 needs to slide in the arc groove 56, so that the extrusion plate 54 rotates along the trajectory of the arc airbag 52, and always maintains the extrusion of the arc airbag 52.

[0053] Among them, the other end of the arc-shaped airbag 52 is provided with a one-way valve, which can only allow air to enter but not to exit;

[0054] The arc-shaped airbag 52 is made of ceramic fiber reinforced silicone, which is both flexible and high temperature resistant;

[0055] Furthermore, when the annular gear rack 33 rotates to drive the second gear 42 to engage with the annular rack 41, the connecting block 53, the sliding block 531 and the extrusion plate 54 on one side of the second gear 42 will move together, thereby squeezing the arc-shaped airbag 52. The air pressure inside the arc-shaped airbag 52 increases, and the gas inside it is ejected through the one-way valve 55. The one-way valve 55 is always located on one side of the grinding block 44, blowing away the waste chips generated during grinding, preventing the waste chips from accumulating at the pipe interface and affecting the grinding effect and subsequent welding quality.

[0056] After polishing is completed, the laser welding head 36 and the motor 31 are started, and the laser welding head 36 begins to weld. The motor 31 drives the gear 1 32 and the annular gear rack 33 to rotate in the opposite direction. The extrusion plate 54 synchronously pulls the arc-shaped airbag 52 to become larger, and the air pressure inside the arc-shaped airbag 52 becomes smaller. At this time, the arc-shaped airbag 52 will be inflated through the one-way valve at the other end. After rotating to the initial position, a whole circle of steel pipe is welded.

[0057] Therefore, this solution uses the cooperation of the rotating welding component 3 and the grinding component 4 to first grind the connection between the two steel pipes before welding, quickly remove impurities and rust at the pipe interface, and synchronously drive the blowing component 5 on one side during the rotation to blow away the waste chips generated during grinding, thereby removing the waste chips in time and ensuring the cleanliness of the pipe interface to prevent it from affecting the subsequent welding quality. Finally, the treated steel pipe is welded by rotating in the opposite direction, which improves the overall work efficiency, shortens the project cycle, and reduces labor costs and equipment losses.

[0058] Embodiment 3: Based on Embodiments 1 and 2, this embodiment aims to increase the stability of the joints between the steel pipes.

[0059] See Figure 1 、 Figure 10-12 The support assembly 1 6 includes a fixed block 2 61 fixedly connected to the front end of the two support frames 24, the lower end of the fixed block 2 61 is fixedly connected to two pressure rollers 62, the left and right ends of the movable base 1 are fixedly connected to fixed seats 63, the upper ends of the two fixed seats 63 are fixedly connected to rotating seats 64, and the outer surfaces of the two rotating seats 64 are rotatably connected to swing seats 65.

[0060] The ends of the two swing seats 65 that are away from each other are slidably connected to the adjustment blocks 651, and the upper sides of the ends of the two swing seats 65 that are close to each other are provided with card slots 652. The inner surfaces of the two card slots 652 are slidably connected to the two pressure rollers 62. The upper ends of the two fixed seats 63 are fixedly connected to the limiting columns 66. The outer surfaces of the two limiting columns 66 are slidably connected to the sliding seats 67. The ends of the two sliding seats 67 that are away from each other are fixedly connected to the connecting seats 68.

[0061] Furthermore, when the second fixing block 61 descends to the bottom, the second support frame 24 and the first support frame 23 are also clamped with the steel pipe. At this time, the pressure roller 62 is stuck in the slot 652 and will not be separated from the swing seat 65.

[0062] See Figure 10 and Figure 11 The second support assembly 7 includes a support seat 71 fixedly connected to the two connecting seats 68 on the same side. The upper end of the support seat 71 is fixedly connected to a plurality of springs 72, and the upper ends of the plurality of springs 72 are fixedly connected to a buffer plate 73.

[0063] Specifically, the spring 72 and the buffer plate 73 can provide buffering;

[0064] Furthermore, the fixed block 2 61 rises and falls together with the support frame 2 24. When the hydraulic device 22 drives the support frame 24 down the well to clamp the steel pipe, the fixed block 2 61 drops synchronously to drive the pressure roller 62 to squeeze the swing seat 65, so that one end of the swing seat 65 drops and the other end rises. The raised end of the swing seat 65 will synchronously drive the sliding seat 67 and the connecting seat 68 to rise, thereby driving the support seat 71, the spring 72 and the buffer plate 73 to rise together, and rest against the lower ends of the two steel pipes, providing support force to the bottom of both sides of the two steel pipes, and preventing the pipeline from being displaced or deformed due to uneven force during the welding process.

[0065] Therefore, this solution, through the cooperation between the positioning component 2 and the support component 1 6, drives the support components 2 7 on both sides to be lifted synchronously during the process of the support frame 1 23 and the support frame 2 24 approaching each other, providing stable supporting force for the bottom of both sides of the two steel pipes, not only considering the horizontal alignment of the pipeline, but also taking into account the stability of the pipeline in the vertical direction, ensuring that the pipeline is always in a stable state during the welding process, and effectively reducing weld defects caused by pipeline instability, such as weld cracks, lack of fusion and other problems.

[0066] It should be noted that the specific installation methods, circuit connection methods and control methods of the hydraulic device 22, motor 31, laser welding head 36 and telescopic rod 43 used in the present invention are all conventional designs and will not be elaborated in detail in the present invention.

[0067] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A welding device for laying municipal road pipelines, comprising a mobile base (1), characterized in that: A through slot (11) is provided at the upper end of the movable base (1), a positioning assembly (2) is provided at the upper end of the movable base (1), a rotary welding assembly (3) is provided at the middle position of the two positioning assemblies (2), a grinding assembly (4) is provided at the upper end of the movable base (1), a blowing assembly (5) is provided at the right end of the rotary welding assembly (3), support assemblies 1 (6) are provided at the front and rear sides of the movable base (1), support assemblies 2 (7) are provided on the left sides of the two support assemblies 1 (6), and support assemblies 2 (7) are provided on the right sides of the two support assemblies 1 (6); The rotary welding assembly (3) includes a motor (31) fixedly mounted inside the movable base (1), the output end of the motor (31) is fixedly connected to a gear 1 (32), the upper end of the movable base (1) is fixedly connected to a support base 1 (34), the upper end of the movable base (1) and the right end of the support base 1 (34) is fixedly connected to a support base 2 (35), the outer surfaces of the support base 1 (34) and the support base 2 (35) are slidably connected to an annular gear frame (33), the left and right ends of the annular gear frame (33) are both provided with an annular limiting groove (331), the outer surface of the gear 1 (32) is meshed with the annular gear frame (33), and the inner surface of the annular gear frame (33) is fixedly mounted with a laser welding head (36); The grinding assembly (4) includes an annular rack (41) fixedly connected to the upper end of the supporting base (34), the outer surface of the annular rack (41) is meshedly connected to the second gear (42), the lower end of the second gear (42) is rotatably connected to the inner surface of the annular gear frame (33), the upper end of the second gear (42) is fixedly connected to the telescopic rod (43), and the upper end of the telescopic rod (43) is fixedly connected to the grinding block (44); The blowing assembly (5) comprises an annular frame (51) fixedly connected to the upper end of the supporting base 2 (35), a limiting groove (511) is provided on a side of the annular frame (51) close to the annular gear frame (33), an arc-shaped airbag (52) is provided inside the annular frame (51), a connecting block (53) is fixedly connected to the inner surface of the annular gear frame (33) and located on one side of the gear 2 (42), the outer surface of the connecting block (53) is slidably connected to the limiting groove (511), the inner surface of the connecting block (53) is slidably connected to the sliding block (531), the end of the sliding block (531) away from the connecting block (53) is fixedly connected to the extrusion plate (54), the outer surface of the extrusion plate (54) is fixedly connected to one end of the arc-shaped airbag (52), the end of the arc-shaped airbag (52) close to the extrusion plate (54) is provided with a one-way valve (55), and the one-way valve (55) passes through the inner surface of the extrusion plate (54); One end of the arc-shaped airbag (52) away from the extrusion plate (54) is fixedly connected to the inner surface of the annular frame (51), and the lower end of the extrusion plate (54) is fixedly connected to the limiting bead (541). The inner surface of the annular frame (51) is provided with an arc-shaped groove (56), and the outer surface of the limiting bead (541) is slidably connected to the arc-shaped groove (56).

2. A welding device for laying municipal road pipelines according to claim 1, characterized in that: The positioning assembly (2) includes a fixed block (21) fixedly connected to both the front and rear sides of the upper end of the movable base (1), a hydraulic device (22) is fixedly installed on the upper ends of the two fixed blocks (21), a support frame (23) is fixedly connected to both the left and right sides of the upper end of the movable base (1), and the front and rear sides of the two support frames (23) close to each other are fixedly connected to the connecting frame (231) together, the output ends of the two hydraulic devices (22) pass through the inner surfaces of the two connecting frames (231), the output ends of the two hydraulic devices (22) are fixedly connected to the connecting frame (241), and the left and right ends of the two connecting frames (241) distributed front and back are fixedly connected to the support frame (24) together.

3. A welding device for laying municipal road pipelines according to claim 2, characterized in that: The two support frames (24) are provided with a plurality of mounting blocks (25) in a circular array on a side close to each other, and the interiors of the plurality of mounting blocks (25) are all threadedly connected with threaded positioning bolts (26).

4. A welding device for laying municipal road pipelines according to claim 2, characterized in that: The support assembly 1 (6) includes a fixed block 2 (61) fixedly connected to the front ends of the two support frames 2 (24), and the support assembly 1 (6) also includes a fixed block 2 (61) fixedly connected to the rear ends of the two support frames 2 (24), the lower end of the fixed block 2 (61) is fixedly connected to two pressure rollers (62), the left and right ends of the movable base (1) are fixedly connected to fixed seats (63), the upper ends of the two fixed seats (63) are fixedly connected to rotating seats (64), and the outer surfaces of the two rotating seats (64) are rotatably connected to swing seats (65).

5. A welding device for laying municipal road pipelines according to claim 4, characterized in that: The ends of the two swing seats (65) that are away from each other are both slidably connected to an adjustment block (651), the upper sides of the ends of the two swing seats (65) that are close to each other are each provided with a card slot (652), the inner surfaces of the two card slots (652) are both slidably connected to the two pressure rollers (62), the upper ends of the two fixed seats (63) are both fixedly connected to a limiting column (66), the outer surfaces of the two limiting columns (66) are both slidably connected to a sliding seat (67), and the ends of the two sliding seats (67) that are away from each other are both fixedly connected to a connecting seat (68).

6. A welding device for laying municipal road pipelines according to claim 5, characterized in that: The support assembly 2 (7) includes a support seat (71) fixedly connected to the two connecting seats (68) on the left side, and the support assembly 2 (7) also includes a support seat (71) fixedly connected to the two connecting seats (68) on the right side, and the upper end of the support seat (71) is fixedly connected to a plurality of springs (72), and the upper ends of the plurality of springs (72) are fixedly connected to a buffer plate (73).

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