A welding assembly fixture for medium and large diameter pipes

Abstract

This utility model belongs to the technical field of auxiliary tools for welding and assembling medium and large diameter pipes. It discloses a welding and assembly fixture for medium and large diameter pipes, including a base. The base is annular, composed of two identical semi-annular structures hinged at one end and detachably connected at the other. Each semi-annular structure includes two identical semi-annular parts and multiple No. 1 nuts. The two semi-annular parts are symmetrically arranged, each with a groove at the same end. Multiple No. 1 nuts are fixedly connected between the two semi-annular parts. Each No. 1 nut is threaded with a threaded push rod. A No. 2 nut is fixedly installed on one side of one of the semi-annular parts, and a threaded push rod is also threaded onto the No. 2 nut. This utility model facilitates the alignment and fixation of pipe ends during pipe butt welding. It features a simple and reliable structure, convenient operation, and improved pipe butt welding accuracy and welding quality.

Description

Technical Field

[0001] This utility model belongs to the technical field of auxiliary tools for welding and assembling medium and large diameter pipes, and specifically relates to an assembly fixture used in the welding and assembly of medium and large diameter pipes. Background Technology

[0002] Medium and large diameter metal pipes are widely used in modern industry and infrastructure, mainly covering municipal water supply, oil and gas energy transportation, chemical / electric industry, large-scale water conservancy projects, and nuclear power. Typical scenarios include urban water supply trunk networks, long-distance oil and gas transportation, chemical raw material / high-pressure steam pipelines, pipe jacking projects, and culverts. In these fields, the welding quality of the pipelines directly affects the safe operation and service life of the system. Due to the large wall thickness and high rigidity of medium and large diameter pipes, traditional manual positioning methods are difficult to guarantee alignment accuracy, easily resulting in defects such as misalignment and angular deformation, affecting the quality of weld formation. Existing clamps often suffer from limited working space, low durability, and low assembly and disassembly efficiency, failing to meet the needs of rapid operation on different pipe diameters and construction sites. Summary of the Invention

[0003] The purpose of this utility model is to solve the problems of limited working space, low durability, and low assembly and disassembly efficiency of existing pipe welding assembly fixtures, and to provide a modular connection fixture with simple structure, wide working surface, durability, and quick assembly and disassembly.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a welding assembly fixture for medium and large diameter pipes, including a base; the base is an annular body, which is formed by two identical semi-annular structures hinged at one end and detachably connected at the other end;

[0005] The semi-circular structure includes two identical semi-circular parts and multiple No. 1 nuts; the two semi-circular parts are symmetrically arranged and each has a groove at the same end; multiple No. 1 nuts are fixedly connected between the two semi-circular parts; each No. 1 nut is threadedly connected to a threaded push rod; a No. 2 nut is fixedly provided on one side of one of the semi-circular parts, and a threaded push rod is also threadedly connected to the No. 2 nut.

[0006] As a further optimization of this utility model, in the two semi-annular structures, the end of one semi-annular structure with a slot is hinged to the end of the other semi-annular structure without a slot by a flat-head pin; the other ends of the two semi-annular structures are connected by a perforated pin and a cotter pin.

[0007] As a further optimization of this utility model, the threaded push rod includes a rod body, a four-corner nut disposed at one end of the rod body, and a screw head disposed at the other end of the rod body; a handle hole is provided on the rod body near the four-corner nut end for inserting a handle.

[0008] As a further optimization of this utility model, the number of No. 1 nuts fixed between the two semi-ring parts is at least 3; the number of No. 2 nuts fixed on one side of the semi-ring parts is 1 to 3.

[0009] As a further optimization of this utility model, the first nut is a square nut and the second nut is a round-headed nut; the square nut is welded to the two semi-ring parts, and the round-headed nut is also welded to the semi-ring parts.

[0010] This utility model is mainly applicable to the welding and assembly of medium and large diameter pipes. It can be used in actual product production, as well as for weldability experiments, process research, welding process evaluation, etc.

[0011] This utility model has a simple and reliable structure, is easy to operate, and can accurately position the pipe fittings, making it convenient to align and tighten the pipe ends of the two fittings, shortening the pipeline construction and welding time, creating better welding conditions, improving work efficiency, making welding operations smoother, and effectively preventing the steel pipe from shifting due to welding heat or external force during the welding process, thus improving welding quality. Attached Figure Description

[0012] Figure 1 This is an isometric view of the present invention;

[0013] Figure 2 for Figure 1 Top view;

[0014] Figure 3 for Figure 1 Rear view;

[0015] Figure 4 This is a partial sectional view of the threaded push rod. Detailed Implementation

[0016] Embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art will understand that the following embodiments are for illustrative purposes only and should not be construed as limiting the scope of the present invention. Where specific techniques, connections, or conditions are not specified in the embodiments, they are performed in accordance with the techniques, connections, or conditions described in the literature in the field or according to the product instructions. Materials, instruments, or equipment used without specified manufacturers are all conventional products that can be obtained through purchase.

[0017] See Figure 1 and Figure 2 As shown in the figure, the present invention provides a welding assembly fixture for medium and large diameter pipes, including a base 1; the base 1 is an annular body, which is formed by two semi-annular structures 2 with the same structure hinged at one end and detachably connected at the other end;

[0018] The semi-annular structure 2 includes two identical semi-annular parts 21 and multiple first nuts 22. The two semi-annular parts 21 are symmetrically arranged, and each has a groove 23 at the same end. The multiple first nuts 22 are fixedly connected between the two semi-annular parts 21. Specifically, holes 24 with a depth of 30mm are pre-drilled on the two semi-annular parts 21 to allow the end of the first nut 22 to be inserted. After the first nut 22 is inserted, it is welded on both sides. Each first nut 22 is threadedly connected to a threaded push rod 3. A second nut 4 is fixedly provided on one side of one of the semi-annular parts 21. Specifically, a hole with a depth of 30mm is opened on one side of the semi-annular part 21 to allow the end of the second nut 4 to be inserted. After the second nut 4 is inserted, it is welded. A threaded push rod 3 is also threadedly connected to the second nut 4. The first nut 22 is a square nut, and the second nut 4 is a round-headed nut.

[0019] As a further implementation of this plan, combined with Figure 2 and Figure 3 As shown, in the two semi-annular structures 2, one end of the semi-annular structure 2 with a slot 23 is hinged to the other end of the semi-annular structure 2 without a slot 23 by a flat-head pin 5; the other ends of the two semi-annular structures 2 are connected by a perforated pin 6 and a cotter pin 7; the design of the perforated pin 6 and the cotter pin 7 allows the semi-annular structure 2 to be opened and closed manually.

[0020] As a further implementation of this solution, the threaded push rod 3 includes a rod body 31, a square nut 32 disposed at one end of the rod body 31, and a threaded push head 33 disposed at the other end of the rod body 31; a handle hole 34 is provided on the rod body 31 near the square nut 32 for inserting a handle 8, such as... Figure 4 As shown. The threaded push rod 3 supports both wrench and handle tightening methods, making installation and removal quick and easy; the screw head of the threaded push rod is a ball head base, which can adapt to various pipe curved surfaces.

[0021] In this embodiment, four No. 1 nuts 22 are fixed between the two semi-ring parts 21, and a total of eight No. 1 nuts 22 are fixed on the entire base 1, arranged at equal intervals. Two No. 2 nuts 4 are fixed on one side of the semi-ring parts 21, and a total of four No. 2 nuts 4 are fixed on one side of the entire base 1, arranged at equal intervals. By optimizing the arrangement of the threaded push rods, four threaded push rods are set to clamp the end of the long pipe, and they are welded to the outer surface of the left base, thus expanding the working space.

[0022] In this embodiment, the base is made of Q345 steel, manufactured through cutting and welding. The inner diameter is 1200mm, the outer diameter is 1440mm, and the distance between the two semi-rings is 70mm. Nut #1 is 120mm long, 50mm wide, and 60mm high; nut #2 is 170mm long, 50mm wide, and 60mm high. The threaded push rod is made of 40Cr alloy steel, machined using a CNC machine tool, with a length of 550mm, a diameter of 30mm, and a handle hole diameter of 15mm. This fixture is suitable for pipe diameters from 450mm to 1100mm. The fixture is robustly constructed, and the welded connections enhance its durability.

[0023] The construction of large-diameter long-distance pipelines is generally carried out in the field, using a method of assembling and welding each pipe one by one to extend it. After several assembly and welding operations, the pipe ends of the long pipes develop a certain rigidity, and the amount of plastic deformation at the pipe ends decreases. As the fixed end of this clamp, the short pipe needs to be connected to the long pipe by hoisting. At this time, the amount of plastic deformation increases, and the pipe ends need to be adjusted through the eight-point end. After adjustment, a permanent welded connection joint without misalignment is formed with the end of the long pipe.

[0024] This invention allows the fixture to be clamped onto two medium-to-large diameter metal pipes that need to be butt-welded. By tightening the threaded push rod, the pipe ends are aligned, and welding can then be performed. After welding, the threaded push rod is loosened, the cotter pin is removed, the perforated pin is taken out, and the semi-annular structure is opened to remove the fixture.

[0025] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A medium-large diameter pipe welding assembly jig comprising a base (1); characterized in that, The base (1) is a ring-shaped body, which is made of two semi-ring-shaped structures (2) with the same structure, one end of which is hinged and the other end is detachably connected; The semi-circular structure (2) includes two semi-circular parts (21) with the same structure and shape and multiple first nuts (22); the two semi-circular parts (21) are symmetrically arranged and each has a groove (23) at the same end; multiple first nuts (22) are fixedly connected between the two semi-circular parts (21); a threaded push rod (3) is threadedly connected to each first nut (22); a second nut (4) is fixedly provided on one side of one of the semi-circular parts (21); a threaded push rod (3) is also threadedly connected to the second nut (4).

2. A clamp according to claim 1, wherein, In the two semi-circular structures (2), one of the semi-circular structures (2) with a slot (23) is hinged to the other semi-circular structure (2) without a slot (23) by a flat-head pin (5); the other ends of the two semi-circular structures (2) are connected by a perforated pin (6) and a cotter pin (7).

3. A medium to large diameter pipe welding assembly jig according to claim 1 or 2, characterised in that, The threaded push rod (3) includes a rod body (31), a four-corner nut (32) at one end of the rod body (31) and a screw head (33) at the other end of the rod body (31); a handle hole (34) is provided on the rod body (31) near the four-corner nut (32) for inserting the handle (8).

4. A clamp according to claim 1 or 3, characterised in that The number of No. 1 nuts (22) fixed between the two semi-ring parts (21) is 4; the number of No. 2 nuts (4) fixed on one side of the semi-ring parts (21) is 2.

5. A welding assembly fixture for medium and large diameter pipes according to claim 1, characterized in that, Nut No. 1 (22) is a square nut, and nut No. 2 (4) is a round-headed nut.

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