Auxiliary welding fixture

Abstract

The utility model relates to pressure vessel manufacturing technical field discloses a kind of auxiliary welding tool, and the workpiece to be welded is composed of base and pipe seat, and welding tool includes roller stand, still includes tool cylinder, multiple first connecting pieces and multiple second connecting pieces, tool cylinder is rolled and set on roller stand, and installation site matched with base is reserved on both sides of tool cylinder, and base is positioned and welded and fixed on tool cylinder by first connecting piece in installation site, and pipe seat is positioned and welded and fixed relative to tool cylinder by second connecting piece. By being provided with tool cylinder and being matched with roller stand, the base of workpiece to be welded is positioned and welded by connecting piece in the installation site of both sides of tool cylinder, realize that circular connecting pipe or pipe seat is automatically welded on base, solve the technical problem that welding defect is more, efficiency is low, worker's labor intensity is big caused by manual welding in three-way connecting pipe in prior art.

Description

Technical Field

[0001] This utility model relates to the field of pressure vessel manufacturing technology, specifically to an auxiliary welding fixture for a serpentine tube high-pressure heater tee connection. Background Technology

[0002] The serpentine tube high-pressure heater is a large-scale auxiliary machine in thermal power plants, and its manufacturing is quite difficult. The welding of the tee assembly is one of the most challenging processes. The tee's pipe seat and base use a saddle-type full-penetration weld connection structure. However, due to the structural limitations of the thick pipe seat wall, this weld cannot be achieved using traditional automatic welding equipment. Current technology typically uses manual welding, which has the following technical problems: 1. Manual welding is greatly affected by human factors, resulting in a low weld qualification rate; 2. To improve the weld qualification rate, flat welding is usually used, requiring the tee connector to be placed horizontally and repeatedly turned over for welding. This method involves a large amount of filler material and a long construction period; 3. The welding process requires workers to maintain a certain posture for extended periods, resulting in high labor intensity.

[0003] A utility model patent with application number CN202022001916.2, entitled "Welding Equipment for T-joints," specifically relates to a welding equipment for tee joints. This equipment includes a base, a welding device, a support device, and a lifting and rotating device. The lifting and rotating device includes a rotary table and a universal joint. The rotary table has a degree of freedom of vertical movement and a degree of freedom of rotation around its own axis. In use, the rotary table engages with the outer diameter of the workpiece through a clamping component to fix one end of the workpiece. The rollers of the support device are tightly fitted with the outer diameter of the tee joint to support it. The rollers rotate around their own axis, driving the tee joint and the rotary table to rotate. While this technical solution ensures that the weld offset meets welding process requirements by limiting the axial helical movement of the workpiece during welding rotation and eliminates the effects of misalignment and non-parallelism between the connecting parts at both ends of the tee joint, it also suffers from the technical problem of a long construction period, as only one tee joint can be welded at a time. Utility Model Content

[0004] In order to solve the technical problems of numerous welding defects, low efficiency, and high labor intensity of workers in the existing technology of T-joint pipe welding, this utility model proposes an auxiliary welding fixture.

[0005] The auxiliary welding fixture consists of a base and a pipe seat. The welding fixture includes a roller frame, a fixture cylinder, a plurality of first connecting parts, and a plurality of second connecting parts. The fixture cylinder is rotatably mounted on the roller frame, and mounting positions matching the base are reserved on both sides of the fixture base. The base is positioned and welded to the fixture cylinder at the mounting positions using the first connecting parts, and the pipe seat is positioned and welded relative to the fixture cylinder using the second connecting parts, ensuring that the center line of the fixture cylinder is coaxial with the center line of the pipe seat. The weld between the base and the pipe seat is located outside the fixture cylinder.

[0006] The auxiliary welding fixture for the aforementioned tee pipe uses a second connector to position and weld the pipe seat to the base.

[0007] The auxiliary welding fixtures for the aforementioned tee pipe, both the first and second connecting parts, use tie plates.

[0008] The beneficial effects of this utility model include: by setting a tooling cylinder and cooperating with a roller frame, the pipe seat of the tee pipe to be welded is positioned by welding the connecting parts at the mounting positions on both sides of the tooling cylinder, realizing the automatic welding of the circular pipe or pipe seat on the base, solving the technical problems of many welding defects, low efficiency and high labor intensity caused by manual welding of tee pipes in the prior art. The tee pipes on both sides of the tooling cylinder realize self-weighting, making the rotation of the tooling cylinder more stable during the welding process. Attached Figure Description

[0009] Figure 1 This is a front sectional view of the auxiliary welding fixture for the tee connector of this utility model.

[0010] Figure 2 for Figure 1 Sectional view along line A.

[0011] Figure 3 for Figure 1 Sectional view along line B.

[0012] Figure 4 for Figure 1 Sectional view along line C.

[0013] Figure 5 This is a cross-sectional view of the three-way component structure of this utility model.

[0014] The markings in the diagram are: 1-roller frame, 2-tool cylinder, 21-installation position, 3-first connector, 4-base, 5-pipe seat, 6-second connector. Detailed Implementation

[0015] The present invention will now be described in conjunction with the accompanying drawings.

[0016] like Figures 1-4The image shows the auxiliary welding fixture of this utility model. In this embodiment, welding a tee fitting is taken as an example. Figure 5 The image shows a tee fitting to be welded. In the auxiliary welding fixture for the tee fitting described in this invention, the tee fitting is formed by welding a base 4 and a pipe seat 5. The welding fixture includes a roller frame 1, a fixture cylinder 2, a plurality of first connecting parts 3, and a plurality of second connecting parts 6. The fixture cylinder 2 is rotatably mounted on the roller frame 1. During welding, the fixture cylinder 2 rolls axially on the roller frame 1. Mounting positions 21 matching the base 4 are reserved on both sides of the fixture cylinder 2. The base 4 is positioned, welded, and fixed to the fixture cylinder 2 at the mounting positions 21 via the first connecting parts 3. The second connecting parts 6... The pipe seat 5 is fixed relative to the tooling cylinder 2 by positioning welding, and the center line of the tooling cylinder 2 is ensured to be coaxial with the center line of the pipe seat 5. This minimizes the offset of the pipe seat 5 of the tee pipe during the rotation of the tooling cylinder 2, which is more conducive to the automation of the whole process. The weld between the base 4 and the pipe seat 5 is located outside the tooling cylinder 2. In this embodiment, the two tee pipes are transported to the installation positions 21 on both sides of the tooling cylinder 2 by hoisting equipment. The outer side of the installation position 21 is welded to the base 4 through the first connector 3 and the second connector 6, thereby fixing the tee pipes on the installation position 21.

[0017] Furthermore, the base 4 and the tube seat 5 can be welded together by the second connector 6, so that the connection between the base 4 and the tube seat 5 is more stable when the weld between the base 4 and the tube seat 5 is welded. After the welding is completed, the second connector 6 can be cut and removed.

[0018] Furthermore, the first connector 3 and the second connector 6 are made of tie plates.

[0019] The assembly process of the auxiliary welding fixture for the tee connector described in this embodiment is as follows:

[0020] S1. Locate and mark the center lines of the tooling cylinder 2 and the pipe seat 5;

[0021] S2. After a pre-assembled tee pipe is lifted and transported to both ends of the tooling cylinder 2, the base 4 is snapped into the installation position 21;

[0022] S3. Based on the centerline found in step S1, make fine adjustments following the principle of making the centerlines of the tooling cylinder 2 and the tube seat 5 coaxial;

[0023] S4. Weld the first connector 3 and the second connector 6 between the outer and inner sides of the base 4 and the mounting position 21;

[0024] S5. Repeat steps S1 to S5 to install the tee connector on the other side of tooling cylinder 2;

[0025] S6. Make the tooling cylinder 2 rotate with the roller frame 1 on the roller frame 1, and perform submerged arc automatic welding of the fillet weld of the tee pipe in the flat welding position;

[0026] S7. After welding is completed, cut the first connector 3 and the second connector 6, and remove the welded tee pipe from the mounting positions 21 on both sides of the tooling cylinder 2.

[0027] By welding the structure described in Example 1 according to the above steps, the time required for welding the tee pipe is reduced by more than 50% compared to traditional manual welding, effectively shortening the manufacturing cycle.

[0028] Compared with the prior art, the auxiliary welding fixture provided by this utility model has a fixture cylinder and a roller frame with rolling connection. The mounting positions on both sides of the fixture cylinder are welded and fixed to the T-connector to be welded by the connecting parts. The T-connector on both sides of the fixture cylinder can be welded at the same time by rotating the fixture cylinder on the roller frame, saving at least 50% of the welding time. While solving the technical problems of multiple welding defects, low efficiency and high labor intensity of T-connectors in the prior art, the T-connector on both sides of the fixture cylinder also achieves self-weighting, making the rotation of the fixture cylinder more stable during the welding process.

Claims

1. An auxiliary welding fixture, wherein the workpiece to be welded consists of a base (4) and a pipe seat (5), and the welding fixture includes a roller frame (1), characterized in that: It also includes a tooling cylinder (2), a plurality of first connecting parts (3) and a plurality of second connecting parts (6). The tooling cylinder (2) is rotatably mounted on the roller frame (1), and both sides of the tooling cylinder (2) are reserved with mounting positions (21) that match the base (4). The base (4) is positioned, welded and fixed to the tooling cylinder (2) by the first connecting parts (3) at the mounting positions (21). The pipe seat (5) is positioned, welded and fixed relative to the tooling cylinder (2) by the second connecting parts (6), and the center line of the tooling cylinder (2) is coaxial with the center line of the pipe seat (5). The weld seam of the base (4) and the pipe seat (5) is located outside the tooling cylinder (2).

2. The auxiliary welding fixture according to claim 1, characterized in that: The tube seat (5) and the base (4) are positioned and welded together by the second connector (6).

3. The auxiliary welding fixture according to claim 1, characterized in that: Both the first connector (3) and the second connector (6) are made of tie plates.

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