Flute-shaped branch pipe welding positioning tool

Abstract

The utility model relates to a positioning tool, and particularly discloses a flute-shaped branch pipe welding positioning tool. Comprising a base, a first limiting seat and a second limiting seat which are used for positioning the two ends of a main pipe are fixedly arranged on the base, a hollow positioning shaft used for abutting against a branch pipe is detachably arranged on the first limiting seat, and the hollow positioning shaft and the main pipe are coaxially arranged. The distance between the outer diameter of the hollow positioning shaft and the outer diameter of the main pipe is the depth of the branch pipe inserted into the branch hole. An axial limiting piece used for limiting the length of the portion, inserted into the fixing hole, of the main pipe is arranged in the fixing hole. And a positioning plate for limiting the position of the free end of each branch pipe of the flute-shaped branch pipe is also fixedly arranged on the base. The welding positioning device is simple in structure, can realize quick and accurate positioning without changing the structures of the original main pipe and the branch pipe, and is suitable for welding positioning of the flute-shaped branch pipe.

Description

Technical Field

[0001] This utility model relates to a positioning fixture, specifically a flute-shaped manifold welding positioning fixture. Background Technology

[0002] Air conditioning equipment includes pipes of various specifications, which need to be welded and assembled during the production process. Welding fixtures are typically used to effectively fix each pipe during welding to facilitate precise welding. A flute-shaped branch pipe is a type of air conditioning pipe; it has a structure with one input port and multiple output ports. Specifically, several branch holes are made in the wall of the main pipe along its length. These branch holes are generally designed with flanged holes, and branch pipes are sealed and welded at these holes.

[0003] In the welding process of the main pipe and branch pipe connection of the flute-shaped manifold, the main pipe and branch pipes must first be fixed in position and orientation on the welding fixture according to the processing requirements. This involves inserting the branch pipe into the branch hole of the main pipe to a certain depth, and finally welding the joint between the two. Existing techniques for inserting and positioning the branch pipe mainly include two methods: the first is... Figure 1 As shown, a limiting protrusion 1 is formed by punching a point protruding outward from the pipe wall on each branch pipe that needs to be welded. The insertion position of the branch pipe is limited by the engagement of the limiting protrusion 1 with the edge of the branch hole 2 (the arrow in the figure indicates the insertion direction). The second method is to set a stepped limiting point at the lower flange of the branch hole, which eliminates the need for the limiting protrusion 1. This structure has been disclosed in Chinese Patent No. CN 222186181 U, "A Flute-shaped Branch Pipe with Flanged Hole Limiting Welding Structure". Specifically, positioning is achieved by the lower end of the branch pipe abutting against the stepped surface fixed in the branch hole. The main problem with the first positioning method is that precise measurement is required when punching the protrusion point on each branch pipe to ensure that the protrusion point position is consistent, making the punching process time-consuming and labor-intensive, resulting in low production efficiency. Furthermore, the punching process can easily cause cracks or even punctures in the pipe, leading to a high scrap rate and affecting product quality. The second method, which uses stepped branch holes for positioning, avoids the time-consuming and labor-intensive process of creating raised dots and the problem of pipe cracks. However, it requires changing the structure of the original flute-shaped branch hole, that is, each branch hole needs to be specifically processed and modified. This results in problems such as high processing difficulty and low production efficiency. Utility Model Content

[0004] To address the aforementioned shortcomings in the existing technology, this utility model aims to provide a welding positioning fixture for flute-shaped branch pipes, so as to achieve rapid and precise positioning of the welding position of the branch pipe at the branch hole of the flute-shaped branch pipe without changing the original structure of the flute-shaped branch pipe.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A flute-shaped branch pipe welding positioning fixture includes a base, on which a first limiting seat and a second limiting seat are fixed for positioning both ends of the main pipe. A hollow positioning shaft for abutting the branch pipe is detachably provided on the first limiting seat. The hollow positioning shaft is coaxially arranged with the main pipe, and the outer diameter of the hollow positioning shaft is smaller than the inner diameter of the main pipe. When the main pipe is placed on the first limiting seat and the second limiting seat and sleeved on the hollow positioning shaft, the distance between the outer diameter of the hollow positioning shaft and the outer diameter of the main pipe is the depth to which the branch pipe is inserted into the branch hole.

[0006] As a limitation of this utility model: the first limiting seat has a through hole-shaped fixing hole for horizontally inserting the main pipe, and the top of the second limiting seat is a semi-circular groove; the fixing hole and the semi-circular groove are coaxially arranged, and the inner diameter of the fixing hole and the inner diameter of the semi-circular groove are equal to the outer diameter of the main pipe.

[0007] As a limitation of this utility model: a detachable fixing block is fixedly provided on the outer side of the first limiting seat, and a hollow positioning shaft is provided on the fixing block, which is placed in the fixing hole and coaxially arranged with the fixing hole.

[0008] As a limitation of this utility model: one end of the hollow positioning shaft extends out of the fixed block to form a connecting end for connecting the welding protective gas vent pipe, and the other end of the hollow positioning shaft extends above the second limiting seat.

[0009] As a limitation of this utility model: the fixing hole is provided with an axial limiting member for limiting the length of the main pipe inserted into the fixing hole, and one end of the main pipe inserted into the fixing hole abuts against the axial limiting member; the axial limiting member is annular, and its outer diameter is equal to the inner diameter of the fixing hole.

[0010] As a limitation of this utility model: the base is also detachably provided with a positioning plate for limiting the position of the free end of each branch pipe of the flute-shaped branch pipe, and the positioning plate is provided with a U-shaped positioning groove that matches the free end of the branch pipe.

[0011] As a limitation of this utility model, several ventilation holes are provided on the hollow positioning shaft.

[0012] As a limitation of this utility model, there are 2 to 10 vent holes.

[0013] By adopting the above technical solution, the beneficial effects achieved by this utility model compared with the prior art are as follows:

[0014] This invention does not alter the original structure of the flute-shaped branch pipe and eliminates the need for protruding points on the lower end of the branch pipe wall. A hollow positioning shaft is added to the positioning fixture base. The main pipe is fitted onto the hollow positioning shaft, and its position is fixed by fixing holes and semi-circular grooves. This allows one end of each branch pipe inserted into the branch hole to abut against the surface of the hollow positioning shaft, thus defining the welding position of the branch pipes with a uniform insertion depth. This positioning method achieves rapid positioning and good positioning effect. Ventilation holes are opened on the hollow positioning shaft, allowing welding shielding gas to enter from the connection end of the hollow positioning shaft and evenly and quickly fill the interior of each pipe, protecting the interior of the pipe from oxidation during welding and ensuring the welding quality inside the flute-shaped branch pipe.

[0015] In summary, this utility model has a simple structure and low manufacturing cost. It can achieve rapid and accurate welding positioning without changing the original structure of the main pipe and branch pipes, thereby improving the welding production efficiency and product qualification rate of flute-shaped branch pipes. It is suitable for welding positioning of flute-shaped branch pipes. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 A schematic diagram of the welding positioning structure for an existing flute-shaped branch pipe;

[0018] Figure 2 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0019] Figure 3 This is a structural schematic diagram of the welding usage state of an embodiment of the present utility model;

[0020] Figure 4 for Figure 2 Cross-sectional view along plane AA.

[0021] In the figure: 1-limiting protrusion, 2-branch hole, 3-base, 4-first limiting seat, 5-second limiting seat, 6-fixing hole, 7-semi-circular bracket, 8-fixing block, 9-hollow positioning shaft, 10-positioning plate, 11-U-shaped positioning groove, 12-vent hole, 13-axial limiting component. Detailed Implementation

[0022] The preferred embodiments of this utility model are described below with reference to the accompanying drawings. It should be understood that the flute-shaped manifold welding positioning fixture described herein is a preferred embodiment and is only used for illustration and explanation of this utility model, and does not constitute a limitation thereof.

[0023] The directional terms or positional relationships used in this utility model, such as "up," "down," "left," and "right," are based on the positional relationships in the accompanying drawings of this utility model. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component must have a specific orientation, or that it must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the content protected by this utility model. Example

[0024] This implementation example Figures 2-4 As shown, a welding positioning fixture for a flute-shaped branch pipe includes a base 3. A first limiting seat 4 and a second limiting seat 5 are fixed on the base 3. The first limiting seat 4 and the second limiting seat 5 are used to position the two ends of the main pipe of the branch pipe. A hollow positioning shaft 9 for abutting the branch pipe is provided on the first limiting seat 4. The hollow positioning shaft 9 is coaxially arranged with the main pipe. The outer diameter of the hollow positioning shaft 9 is smaller than the inner diameter of the main pipe. When the main pipe is placed on the first limiting seat 4 and the second limiting seat 5 and sleeved on the hollow positioning shaft 9, the distance between the outer diameter of the hollow positioning shaft 9 and the outer diameter of the main pipe is the depth to which the branch pipe is inserted into the branch hole 2, and the end of the hollow positioning shaft 9 near the second limiting seat 5 is placed inside the main pipe.

[0025] like Figure 2 As shown, a fixing hole 6 is provided on the first limiting seat 4 for horizontally inserting the flute-shaped branch pipe main pipe. The fixing hole 6 is a through hole and serves to fix one end of the main pipe. The top of the second limiting seat 5 is a semi-circular groove 7. In this embodiment, the semi-circular groove 7 is set with its opening facing upwards to fix the position of the other end of the main pipe. The fixing hole 6 and the semi-circular groove 7 are coaxially arranged, and the inner diameter of the fixing hole 6 and the inner diameter of the semi-circular groove 7 are equal to the outer diameter of the main pipe. The end of the first limiting seat 4 away from the second limiting seat 5 is its outer side. A fixing block 8 is detachably provided on the outer side of the first limiting seat 4. The fixing block 8 is detachably set on the base 3 by bolts and screw holes. Of course, other detachable fixing methods can also be used to detach the fixing block 8. A hollow positioning shaft 9 is fixedly inserted into the fixing block 8. The hollow positioning shaft 9 is placed inside the fixing hole 6 and is coaxially arranged with the fixing hole 6. The outer diameter of the hollow positioning shaft 9 is smaller than the inner diameter of the fixing hole 6. Thus, when the main pipe is fixed to the first limiting seat 4 and the second limiting seat 5, the main pipe is sleeved outside the hollow positioning shaft 9, that is, the hollow positioning shaft 9 is located inside the main pipe and there is a certain distance between it and the inner wall of the main pipe. When the end of the branch pipe to be welded is inserted into the branch hole 2, it can abut against the hollow positioning shaft 9 inside the main pipe. At this time, the difference between the outer diameter of the main pipe and the outer diameter of the hollow positioning shaft 9 is the depth of the branch pipe inserted into the branch hole. By adjusting the size of the outer diameter of the hollow positioning shaft 9, the insertion depth of the branch pipe can be adjusted, thereby uniformly limiting the insertion depth of the branch pipe during welding. This positioning method is uniform, fast and accurate.

[0026] The hollow positioning shaft 9 extends from one end of the fixing block 8 to form a connecting end for connecting a welding shielding gas vent pipe (not shown in the figure). The other end of the hollow positioning shaft 9 extends above the second limiting seat 5. Welding of the air conditioning branch pipe requires a welding shielding gas (generally nitrogen is used), which prevents the inner wall of the pipe from being oxidized during high-temperature welding. The welding shielding gas can enter the pipe through the connecting end of the hollow positioning shaft 9. In order to ensure that the welding shielding gas can fill the interior of each pipe evenly and quickly, a number of vent holes 12 are opened on the hollow positioning shaft 9, with 2 to 10 vent holes 12. In this embodiment, there are 6 vent holes 12, with 3 on each side of the hollow positioning shaft in the radial direction.

[0027] Branch pipes are typically multi-angle curved structures, and different air conditioner models have specific requirements for their orientation. Therefore, the positioning fixtures need to be positioned according to the design requirements. For example... Figure 2 , Figure 3 As shown, a positioning plate 10 is detachably mounted on the base 3 to define the position of the free ends of each branch pipe of the flute-shaped branch pipe. In this embodiment, the positioning plate 10 is fixed to the base 3 using bolts and screw holes, but other detachable fixing methods can also be used. The positioning plate 10 is arranged horizontally and has an irregular shape. The edge position of the positioning plate 10 is adapted to the design position of the free end of the branch pipe. A U-shaped positioning groove 11 adapted to the size of the free end of the branch pipe is opened on the edge of the positioning plate 10. The two ends of the branch pipe are respectively limited by the hollow positioning shaft 9 and the U-shaped positioning groove 11. The shape of the positioning plate 10 and the position of the U-shaped positioning groove 11 are designed according to different technical requirements. The positioning plate 10 in the figure of this embodiment is only one structural form. The setting of bolts and screw holes can realize the purpose of replacing the positioning plate 10 with different structural forms at any time.

[0028] like Figure 4 As shown, an axial limiting member 13 is provided within the fixing hole 6 to limit the length of the main pipe inserted into the fixing hole 6. The axial limiting member 13 can be fixedly or detachably disposed within the fixing hole 6. When the main pipe is inserted into the fixing hole 6, it can be radially limited in conjunction with the second limiting seat 5. In this embodiment, one end of the main pipe can abut against the axial limiting member 13, thereby limiting the axial direction of the main pipe. In this embodiment, the axial limiting member 13 is annular, and its outer diameter is equal to the inner diameter of the fixing hole. The depth of the main pipe inserted into the fixing hole 6 is limited by adjusting the axial length of the axial limiting member 13. Generally, the range of the main pipe inserted into the fixing hole 6 can be set to 10-15 mm.

[0029] In this embodiment, the flute-shaped branch pipe main is fixed on the base 3. Then, the positions of each branch pipe are defined by the U-shaped positioning groove and the hollow positioning shaft 9. The end of the branch pipe to be welded abuts against the hollow positioning shaft 9 to achieve precise positioning. A nitrogen vent pipe is connected at the connection end to start supplying nitrogen. Welding is carried out after the main pipe and branch pipes are filled with nitrogen. Nitrogen is continuously supplied during the welding process. After welding is completed, nitrogen is supplied for a period of time until each pipe cools down, thus completing the welding.

Claims

1. A flute-shaped manifold welding positioning tool, comprising a base, characterized in that: The base is fixed with a first limiting seat and a second limiting seat for positioning the two ends of the main pipe. A hollow positioning shaft for abutting the branch pipe is detachably provided on the first limiting seat. The hollow positioning shaft is coaxially arranged with the main pipe. The outer diameter of the hollow positioning shaft is smaller than the inner diameter of the main pipe. When the main pipe is placed on the first limiting seat and the second limiting seat and sleeved on the hollow positioning shaft, the distance between the outer diameter of the hollow positioning shaft and the outer diameter of the main pipe is the depth to which the branch pipe is inserted into the branch hole.

2. The flute-shaped manifold welding positioning tool according to claim 1, characterized in that: The first limiting seat has a through-hole-shaped fixing hole for horizontally inserting the main pipe, and the top of the second limiting seat is a semi-circular groove; the fixing hole and the semi-circular groove are coaxially arranged, and the inner diameter of the fixing hole and the inner diameter of the semi-circular groove are equal to the outer diameter of the main pipe.

3. The flute-shaped manifold welding positioning tool according to claim 2, characterized in that: A detachable fixing block is fixed on the outside of the first limiting seat, and a hollow positioning shaft is inserted through the fixing block and placed in the fixing hole and coaxially arranged with the fixing hole.

4. The flute-shaped manifold welding positioning tool according to claim 3, characterized in that: The hollow positioning shaft extends from one end of the fixing block to form a connecting end for connecting the welding protective gas vent pipe, and the other end of the hollow positioning shaft extends above the second limiting seat.

5. A flute-shaped manifold welding positioning tool according to claim 4, characterized in that: The fixing hole is provided with an axial limiting member for limiting the length of the main pipe inserted into the fixing hole, and one end of the main pipe inserted into the fixing hole abuts against the axial limiting member; the axial limiting member is annular, and its outer diameter is equal to the inner diameter of the fixing hole.

6. The flute-shaped manifold welding positioning tool according to any one of claims 1-5, characterized in that: The base is also detachably provided with a positioning plate for defining the free end position of each branch pipe of the flute-shaped branch pipe. The positioning plate is provided with a U-shaped positioning groove that matches the free end of the branch pipe.

7. A flute-shaped manifold welding positioning tool according to claim 6, characterized in that: Several ventilation holes are provided on the hollow positioning shaft.

8. The flute-shaped manifold welding positioning tool according to claim 7, characterized in that: The ventilation holes are provided in the form of 2 to 10 holes.

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