Large-diameter pipe butt welding auxiliary device

Abstract

The utility model belongs to the technical field of welding tools, and particularly relates to a large-diameter pipe butt welding auxiliary device which is characterized in that the large-diameter pipe butt welding auxiliary device comprises a support, a rolling wheel, a wheel shaft and an adjusting bolt, and the support is composed of a bottom plate, a left side plate, a right side plate and a reinforcing rib plate; the upper edges of the opposite positions of the left side plate and the right side plate are each provided with a long hole extending downwards to form a wheel shaft groove, the two wheel shaft grooves are symmetrically formed in the support, wheel shafts are horizontally arranged in the wheel shaft grooves, and idler wheels are arranged in the middles of the wheel shafts. Transverse plates are arranged on the left side plate and the right side plate below the two ends of the wheel shaft in an opposite mode respectively, the adjusting bolts are perpendicularly connected into threaded holes in the transverse plates in the posture that the bolt heads face downwards, the tails of the adjusting bolts abut against the position under the wheel shaft, and fastening nuts are arranged on the adjusting bolts above the transverse plates. Compared with the prior art, the device has the beneficial effects that the welding quality is ensured, the construction efficiency is improved, the labor intensity is reduced, the welding precision is improved, the cost is saved, and the device is high in universality.

Description

Technical Field

[0001] This utility model belongs to the field of welding tooling technology, and in particular relates to an auxiliary device for butt welding of large-diameter pipes. Background Technology

[0002] Large-diameter pipelines are widely used in large-scale engineering construction projects in industries such as petroleum, chemical, power, and water conservancy, including long-distance oil and gas pipelines, water diversion pipelines for large hydropower stations, and steam pipelines for thermal power plants. Taking the West-East Gas Pipeline Project as an example, its pipelines have large diameters and long transmission distances, which places extremely high demands on the quality of pipeline connections. Any connection quality problems may lead to serious consequences such as leaks, affecting the safety and efficiency of the entire project.

[0003] Large-diameter pipelines can achieve greater flow rates and improve production efficiency. However, if the pipe joints are poorly aligned, it can lead to turbulent flow within the pipeline, increasing flow resistance and reducing transport efficiency. Furthermore, defects at the joints can cause stress concentration, which, under the influence of medium pressure, can easily lead to cracks, leaks, and other safety hazards, threatening the safety of personnel and equipment.

[0004] Chinese invention patent application number 201610320383.X discloses a pipe welding alignment device, including two alignment frame members, an angled pipe support, and two spiral jacks. The alignment frame member is handle-shaped, with a horizontal upper end, a vertical middle section, and a lower end at a 135-degree angle to the vertical middle section. The angled pipe support is made of two V-shaped metal materials with planes at 90 degrees. The angled pipe support is fixed to the inner inclined surface of the lower end of the two alignment frame members. The two alignment frame members are located at the two ends of the angled pipe support, which enables the two pipe ends to be quickly aligned and meet the welding requirements.

[0005] Chinese invention patent application number 202111517940.4 discloses a pipe welding alignment chuck, including an annular chuck body, jaws, and a jaw driving mechanism. A pipe passage space is formed in the center of the chuck body for the pipe to be welded to pass through. At least three jaws are evenly spaced along the circumference of the chuck body, and these jaws can move radially along the chuck body under the drive of the jaw driving mechanism to clamp the pipe to be welded. It is easy to use and can achieve automatic pipe alignment.

[0006] It is evident that existing auxiliary devices for pipe butt welding generally only adjust the shape of the weld joint, and there is no device for adjusting the coaxiality of the pipe. The magnitude of the coaxiality deviation of the pipe is also very important for balancing welding stress, and corresponding research and development is needed. Utility Model Content

[0007] The purpose of this utility model is to provide an auxiliary device for butt welding of large-diameter pipes, to overcome the shortcomings of the existing technology, improve the problem of unstable butt welding quality of large-diameter pipes, solve the problems of low welding efficiency and high labor intensity of workers, and solve the problem of increased costs caused by rework due to substandard pipe welding quality. It is suitable for butt welding of two pipes, ensuring the butt welding quality requirements and avoiding safety hazards during construction.

[0008] To achieve the above objectives, this utility model employs the following technical solution:

[0009] A large-diameter pipe butt welding auxiliary device includes a support, rollers, axles, and adjusting bolts. The support consists of a base plate, a left side plate, a right side plate, and reinforcing ribs. The left side plate and the right side plate are vertically arranged on the base plate, and reinforcing ribs are respectively arranged between the outer sides of the left side plate and the base plate. The upper edge of the opposite position of the left side plate and the right side plate is provided with a downward-extending elongated hole to form a wheel axle groove. Two wheel axle grooves are symmetrically arranged on the support, with a distance D between the two wheel axle grooves of 200-250mm. A notch with a width C of 110-120mm is opened between the two wheel axle grooves to avoid interference. A wheel axle is horizontally arranged in the wheel axle groove, and a roller is arranged in the center of the wheel axle. Horizontal plates are respectively provided on the left side plate and the right side plate directly below the two ends of the wheel axle. The adjusting bolt is vertically connected to the threaded hole on the horizontal plate with the bolt head facing down. The tail of the adjusting bolt is directly below the wheel axle. A set nut is provided on the adjusting bolt above the horizontal plate.

[0010] Furthermore, the distance between the left and right side plates is 35-50mm; the distance between the two wheel axle grooves is 200-250mm.

[0011] Furthermore, the roller is a 6208 radial ball bearing, and spacers are provided between the bearing and the left and right side plates, respectively.

[0012] Furthermore, each end of the axle is provided with a ring platform, the height of which is 5-8mm and the width of which is 8-10mm.

[0013] Furthermore, the tail end of the adjusting bolt is inwardly curved and its surface is inlaid with a polytetrafluoroethylene pad.

[0014] Furthermore, the surface of the polytetrafluoroethylene pad is provided with recesses or grooves, and glycerin is coated in the recesses or grooves.

[0015] Furthermore, multiple sets of the device are set along the welding length of the construction pipeline, with an adjacent spacing of 500-800mm. The bottom of the device is a steel platform. After the device is aligned and positioned, it is spot-welded to the steel platform for fixation.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1) It ensures welding quality and is suitable for butt welding of two pipelines. It can accurately fix the axial position of the pipeline, ensure the alignment of the pipe ends, prevent problems such as misalignment and skewing, reduce welding defects such as porosity, slag inclusion, and incomplete penetration, improve the strength, sealing performance and overall quality of the weld, ensure the long-term stable operation of the pipeline system, and solve the problem of unstable butt welding quality of large-diameter pipelines.

[0018] 2) Improved construction efficiency: It can quickly position and fix the pipeline, reduce the time for manual alignment and adjustment, and facilitate simultaneous operation of multiple workstations, increase welding speed, shorten the construction cycle, speed up the construction progress, and solve the problems of low welding efficiency and high labor intensity of workers.

[0019] 3) Reduced labor intensity, alleviating the labor intensity of construction workers in carrying and supporting pipes and maintaining a fixed posture for a long time, improving working conditions, reducing safety risks, and allowing welders to focus more on welding operations, thus improving work comfort and safety;

[0020] 4) Improved welding precision: It can accurately control parameters such as pipe spacing and coaxiality, meeting the requirements of high-precision welding. This is especially important for projects with strict requirements on pipe welding quality, such as high pressure and high temperature, ensuring the quality of the joints and avoiding safety hazards during construction.

[0021] 5) Costs are saved. The amount of high-quality welding is greatly reduced, which helps to improve construction efficiency, shorten the construction period, and reduce costs such as equipment rental and site occupation; it also reduces labor input and labor costs, thereby reducing the overall construction cost and solving the problem of increased costs caused by rework due to substandard pipeline welding quality.

[0022] 6) Improved versatility: Many pipe welding supports are designed with adjustable structures to adapt to pipe welding of different diameters, wall thicknesses and materials, thereby improving equipment utilization, reducing equipment procurement costs and increasing enterprise economic benefits. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0024] Figure 2 yes Figure 1 The left view;

[0025] Figure 3 yes Figure 1 Top view;

[0026] Figure 4 yes Figure 2 Sectional view along line AA;

[0027] Figure 5 yes Figure 2 Enlarged view of a section at point B in the middle;

[0028] In the diagram: 1-support, 2-adjusting bolt, 3-axle, 4-roller, 5-steel pipe to be welded, 6-base plate, 7-left side plate, 8-right side plate, 9-reinforcing rib plate, 10-set nut, 11-ring platform, 12-PTFE gasket, 13-groove, 14-horizontal plate, 15-steel platform, 16-notch, 17-spacer. Detailed Implementation

[0029] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0030] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the specific embodiments used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some embodiments of this utility model. For those skilled in the art, other specific embodiments can be obtained based on these specific embodiments without creative effort.

[0031] The components of the present invention described and shown in the specific embodiments herein can be arranged and designed in numerous different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the claimed invention, but only to illustrate selected embodiments of the invention.

[0032] See Figure 1-5This is a schematic diagram of a large-diameter pipe butt welding auxiliary device according to the present invention. It includes a support 1, rollers 4, axles 3, and adjusting bolts 2. The support 1 consists of a base plate 6, a left side plate 7, a right side plate 8, and reinforcing ribs 9. The left side plate 7 and right side plate 8 are vertically mounted on the base plate 6. Reinforcing ribs 9 are respectively provided between the outer sides of the left side plate 7 and right side plate 8 and the base plate 6. The distance between the left side plate 7 and right side plate 8 is 35-50mm, preferably 38mm. The rollers 4 are 6208 radial ball bearings, providing sufficient support strength. Spacers 17 are provided between the bearings and the left and right side plates, respectively. The upper edges of the left side plate 7 and the right side plate 8, which are directly opposite each other, are provided with downward-extending elongated holes to form a wheel axle groove. The support 1 is provided with two wheel axle grooves symmetrically, and the distance D between the two wheel axle grooves is 200-250mm, preferably 211mm. A wheel axle 3 is horizontally arranged in the wheel axle groove, and a roller 4 is arranged in the center of the wheel axle 3. In order to avoid interference, a notch 16 is opened between the two wheel axle grooves, and the notch width C is 110mm. The left side plate 7 and the right side plate 8, which are directly below the two ends of the wheel axle 3, are respectively provided with horizontal plates 14. The adjusting bolt 2 is vertically connected to the threaded hole on the horizontal plate 14 with the bolt head facing down. The tail of the adjusting bolt 2 is directly below the wheel axle 3. The adjusting bolt 2 above the horizontal plate 14 is provided with a set nut 10. After the adjusting bolt 2 is adjusted into place, the set nut 10 locks the adjusting bolt 2 to prevent it from loosening. In this embodiment of the utility model, the wheel axle groove adopts a semi-closed design, and the two wheel axles 3 adopt a four-point adjustment structure. Each point can be adjusted independently, which provides the possibility for precise adjustment of the pipe section during the welding process. Combined with instruments such as laser alignment, it can effectively ensure the coaxiality requirements when the two pipe sections are welded together.

[0033] The wheel axle 3 is provided with a ring platform 11 at both ends. The ring platform 11 has a height of 5-8mm and a width of 8-10mm. It can be used as a limit at both ends to prevent the wheel axle 3 from coming out of the wheel axle groove.

[0034] The tail end of the adjusting bolt 2 is inwardly curved, and a polytetrafluoroethylene (PTFE) pad 12 is embedded in its surface. The surface of the PTFE pad 12 has recesses or grooves 13, and glycerin is applied to the recesses or grooves.

[0035] This utility model embodiment is applicable to steel pipes with diameters of 200mm-2000mm. Multiple sets are set along the welding length of the construction pipeline, with adjacent spacing of 500-800mm. The bottom of the device is a steel platform 15. After the device is aligned and positioned, it is spot welded to the steel platform 15. Setting multiple sets can be used for steel pipes of different lengths, maintaining stable axial support of the steel pipe.

[0036] The usage process of this utility model embodiment is as follows: the axle 3 and the roller 4 are installed first, and then installed together in the support 1. The axle groove of the axle 3 in the support 1 is semi-closed. The adjusting bolt 2 is installed on the horizontal plate 14, which provides the vertical adjustment space for the axle 3. Finally, the steel pipe 5 to be welded is hoisted or lifted and placed on the roller 4. The pipe section is rotated gradually as welding is carried out until the welding of one round of butt weld is completed.

[0037] In this embodiment, the wheel axle groove and the wheel axle are in a clearance fit, which facilitates assembly and disassembly, reduces assembly difficulty, and improves assembly efficiency. It also allows for quick and easy installation and removal of the rollers to accommodate larger diameter steel pipes. To ensure stable performance, a well-designed clearance fit ensures that the parts maintain a relatively stable fit under different working conditions, such as temperature changes and stress deformation. The clearance absorbs dimensional changes caused by thermal expansion and contraction or stress, preventing the fit from being too tight or too loose, thus ensuring the stable and reliable performance of the equipment.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A large diameter pipe butt welding assist device, characterized by, The support is composed of a bottom plate, left and right side plates and reinforcing rib plates, the left and right side plates are vertically arranged on the bottom plate, and reinforcing rib plates are arranged between the outer sides of the left and right side plates and the bottom plate; the upper edges of the left and right side plates opposite to each other are respectively provided with downwardly extending long holes to form an axle slot, two axle slots are symmetrically arranged on the support, the distance D between the two axle slots is 200-250 mm, a gap is arranged between the two axle slots to avoid interference, the width C of the gap is 110-120 mm, an axle is horizontally arranged in the axle slot, and a roller is arranged in the center of the axle; the left and right side plates below the opposite ends of the axle are respectively provided with a horizontal plate, an adjusting bolt is vertically connected to a threaded hole in the horizontal plate with the bolt head facing downward, the tail of the adjusting bolt is located directly below the axle, and a lock nut is arranged on the adjusting bolt above the horizontal plate.

2. A large diameter pipe butt welding assist device according to claim 1, characterized in that, The distance between the left and right side plates is 35-50 mm, and the distance between the two axle slots is 200-250 mm.

3. A large diameter pipe butt welding assist device according to claim 1, wherein, The roller is a 6208 radial ball bearing, and a spacer is arranged between the bearing and the left and right side plates.

4. A large diameter pipe butt welding assist device according to claim 1, characterized in that, The two ends of the axle are respectively provided with ring platforms, the height of the ring platform is 5-8 mm, and the width is 8-10 mm.

5. A large diameter pipe butt welding assist device according to claim 1, wherein, The tail end of the adjusting bolt is arc-shaped, and a polytetrafluoroethylene pad is embedded on the surface of the tail end.

6. A large diameter pipe butt welding assist apparatus according to claim 5, characterised in that, The surface of the polytetrafluoroethylene pad is provided with concave points or grooves, and the concave points or grooves are coated with glycerol.

7. A large diameter pipe butt welding assist apparatus according to claim 1, wherein, A plurality of groups of the device are arranged along the welding length direction of the construction pipeline, the adjacent distance is 500-800 mm, the bottom of the device is a steel platform, and the device is fixedly connected to the steel platform by spot welding after alignment and positioning.

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