A welding fixture and welding method for GIS shell

Abstract

A welding fixture and method for GIS shells, relating to the field of welding, is disclosed. The GIS shell welding fixture includes a base, a connecting seat, a support column, a first positioning rod, a second positioning rod, a third positioning rod, a fourth positioning rod, a first positioning cover, a second positioning cover, a third positioning cover, and a fourth positioning cover. The connecting seat is located on the top of the base, and the support column is located on the top of the connecting seat. The first, second, third, and fourth positioning rods are detachably mounted on the outer circumferential surface of the support column. The first, second, third, and fourth positioning covers are detachably connected to the first, second, third, and fourth positioning rods, respectively. This invention enables accurate positioning of the branch pipe and mounting hole during GIS shell welding, ensuring the safety of the GIS shell during use.

Description

Technical Field

[0001] This invention relates to the field of welding, specifically to a welding fixture and welding method for GIS shells. Background Technology

[0002] GIS equipment, also known as gas-insulated switchgear, is a key piece of equipment in power transmission and transformation systems. It is mainly used in high-voltage and ultra-high-voltage power systems (such as 110kV and above). It achieves compactness and high reliability by sealing electrical components such as circuit breakers, disconnectors, grounding switches, busbars, and instrument transformers in a metal shell filled with sulfur hexafluoride gas.

[0003] The casing, as a crucial component, directly affects the performance and safety of GIS equipment. (Refer to...) Figure 8 and Figure 10 The GIS housing includes a main housing 22, a first branch pipe 17 with a first flange 171, a second branch pipe 18 with a second flange 181, a third branch pipe 19 with a third flange 191, and a fourth branch pipe 20. The bottom of the main housing 22 is provided with a connecting flange 225. The outer peripheral surface of the main housing 22 has a first mounting hole 221, a second mounting hole 222, a third mounting hole 223, and a fourth mounting hole 224. The first branch pipe 17, the second branch pipe 18, the third branch pipe 19, and the fourth branch pipe 20 are respectively welded to the first mounting hole 221, the second mounting hole 222, the third mounting hole 223, and the fourth mounting hole 224. In the existing technology, there is no dedicated tooling for welding the first branch pipe 17, the second branch pipe 18, the third branch pipe 19, and the fourth branch pipe 20 to the main shell 22. Therefore, when welding the first branch pipe 17, the second branch pipe 18, the third branch pipe 19, and the fourth branch pipe 20 in sequence, they are usually sent to the corresponding positions of the main shell 22 by hoisting equipment for simultaneous hoisting and welding. However, the hoisting equipment cannot guarantee that the branch pipes can be properly positioned during welding. If the branch pipes cannot be properly positioned during welding, it will affect the safety of the GIS equipment. Summary of the Invention

[0004] The present invention provides a welding fixture and welding method for GIS shells. Its main purpose is to overcome the problem that the branch pipes cannot be properly positioned during welding due to the lack of dedicated fixtures for welding existing GIS shells.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A welding fixture for GIS shells includes a base, a connecting seat, a support column, a first positioning rod, a second positioning rod, a third positioning rod, a fourth positioning rod, a first positioning cover, a second positioning cover, a third positioning cover, and a fourth positioning cover. The connecting seat is located on the top of the base, and the support column is located on the top of the connecting seat. The first, second, third, and fourth positioning rods are detachably mounted on the outer circumferential surface of the support column. After being connected to the support column, the first, second, third, and fourth positioning rods can be positioned inside the first, second, third, and fourth branch pipes, respectively. The first, second, third, and fourth positioning covers are detachably connected to the first, second, third, and fourth positioning rods, respectively. A portion of the first, second, and third positioning covers is adapted to the inner diameter of the first, second, and third flanges, respectively. Another portion of the first, second, and third positioning covers can press against the end faces of the first, second, and third flanges, respectively. A portion of the fourth positioning cover is adapted to the inner diameter of the fourth branch pipe, and another portion of the fourth positioning cover can press against the end face of the fourth branch pipe.

[0007] Furthermore, the connecting seat and the base are locked together by bolts.

[0008] Furthermore, the support column is detachably connected to the connecting seat and the base.

[0009] Furthermore, the outer circumferential surface of the support column is provided with a first threaded hole, a second threaded hole, a third threaded hole, and a fourth threaded hole, and the ends of the first positioning rod, the second positioning rod, the third positioning rod, and the fourth positioning rod near the support column are respectively threadedly connected to the first threaded hole, the second threaded hole, the third threaded hole, and the fourth threaded hole.

[0010] Furthermore, the first, second, third, and fourth positioning covers each include interconnected positioning parts and pressure plates. The positioning parts of the first, second, and third positioning covers are respectively adapted to the inner diameters of the first, second, and third flanges, and are located within the first, second, and third flanges, respectively. The pressure plates of the first, second, and third positioning covers can respectively press against the end faces of the first, second, and third flanges. The positioning part of the fourth positioning cover is adapted to the inner diameter of the fourth branch pipe and is located within the fourth branch pipe. The pressure plate of the fourth positioning cover can press against... On the end face of the fourth branch pipe, the first positioning cover, the second positioning cover, the third positioning cover and the fourth positioning cover are all provided with locking holes along the length direction in the middle. The first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod are all provided with fifth threaded holes at the ends away from the support column. The ends of the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod away from the support column are respectively located in the corresponding locking holes. The first positioning cover, the second positioning cover, the third positioning cover and the fourth positioning cover are locked and connected to the fifth threaded holes of the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod respectively by bolts.

[0011] Furthermore, the connecting seat is provided with a sixth threaded hole that runs vertically through the base, the top of the base is provided with a seventh threaded hole that runs vertically through the base, and the bottom surface of the support column is provided with a threaded section, which is threadedly connected to the sixth threaded hole and the seventh threaded hole.

[0012] A method for welding a GIS shell, using the aforementioned GIS shell welding fixture, includes the following steps:

[0013] S1. First, lock the main shell of the GIS housing onto the connecting seat, and then connect the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod to the support column and position them in the first mounting hole, the second mounting hole, the third mounting hole and the fourth mounting hole respectively.

[0014] S2. Send the first branch pipe to the first mounting hole and position the first positioning rod inside the first mounting hole. Then, position the positioning part of the first positioning cover inside the first flange and lock the first flange in place. Then, connect the first positioning cover to the first positioning rod. After the first positioning cover is connected to the first positioning rod, press the pressure plate of the first positioning cover against the end face of the first flange. At this point, the first branch pipe and the first mounting hole can be positioned. Then, pre-weld the first branch pipe to the first mounting hole for fixation. Finally, fully weld the first branch pipe to the first mounting hole.

[0015] S3. Send the second branch pipe to the second mounting hole and position the second positioning rod inside the second mounting hole. Then, position the positioning part of the second positioning cover inside the second flange and lock the second flange in place. Then, connect the second positioning cover to the second positioning rod. After the second positioning cover is connected to the second positioning rod, let the pressure plate of the second positioning cover press against the end face of the second flange. At this time, the second branch pipe and the second mounting hole can be positioned. Then, pre-weld the second branch pipe to the second mounting hole for fixation. Finally, fully weld the second branch pipe to the second mounting hole.

[0016] S4. Send the third branch pipe to the third mounting hole and position the third positioning rod inside the third mounting hole. Then, position the positioning part of the third positioning cover inside the third flange and lock the third flange in place. Then, connect the third positioning cover to the third positioning rod. After the third positioning cover is connected to the third positioning rod, let the pressure plate of the third positioning cover press against the end face of the third flange. At this time, the third branch pipe and the third mounting hole can be positioned. Then, pre-weld the third branch pipe to the third mounting hole for fixation. Finally, fully weld the third branch pipe to the third mounting hole.

[0017] S5. Send the fourth branch pipe to the fourth mounting hole and position the fourth positioning rod inside the fourth mounting hole. Then, position the positioning part of the fourth positioning cover inside the fourth branch pipe and lock the fourth branch pipe in place. Then, connect the fourth positioning cover to the fourth positioning rod. After the fourth positioning cover is connected to the fourth positioning rod, let the pressure plate of the fourth positioning cover press against the end face of the fourth branch pipe. At this time, the fourth branch pipe and the fourth mounting hole can be positioned. Then, pre-weld the fourth branch pipe to the fourth mounting hole for fixation. Finally, fully weld the fourth branch pipe to the fourth mounting hole.

[0018] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages: When the GIS shell is to be welded, the main shell of the GIS shell is first locked onto the connecting seat. Then, the first positioning rod, the second positioning rod, the third positioning rod, and the fourth positioning rod are connected to the support column and respectively located in the first mounting hole, the second mounting hole, the third mounting hole, and the fourth mounting hole. Then, the first branch pipe, the second branch pipe, the third branch pipe, and the fourth branch pipe are respectively welded to the corresponding first mounting hole, the second mounting hole, the third mounting hole, and the fourth mounting hole. Starting with the welding of the first branch pipe, the first branch pipe is first sent to the first mounting hole, and the first positioning rod is positioned in the first mounting hole. Then, a part of the first positioning cover is placed in the first flange, and the first positioning cover is connected to the first positioning rod. After the first positioning cover is connected to the first positioning rod, the other part of the first positioning cover presses against the end face of the first flange. At this time, the first branch pipe and the first mounting hole can be positioned. Then, the first branch pipe is pre-welded to the first mounting hole for fixation. Finally, the first branch pipe is fully welded to the first mounting hole. Following the method described above, the second, third, and fourth branch pipes can be welded to the second, third, and fourth mounting holes, respectively. This invention enables precise positioning of the branch pipes and mounting holes during GIS shell welding, ensuring the safety of the GIS shell during use. Attached Figure Description

[0019] Figure 1 This is a structural diagram of the present invention.

[0020] Figure 2 This is an exploded view of the structure of the present invention.

[0021] Figure 3 for Figure 2 A structural breakdown diagram from another angle.

[0022] Figure 4 This is a schematic diagram of the structure of the first positioning cover of the present invention.

[0023] Figure 5 This is a schematic diagram of the structure of the second positioning cover of the present invention.

[0024] Figure 6 This is a schematic diagram of the structure of the third positioning cover of the present invention.

[0025] Figure 7 This is a schematic diagram of the structure of the fourth positioning cover of the present invention.

[0026] Figure 8 This is a structural diagram of the GIS shell located on a welding fixture.

[0027] Figure 9 for Figure 8 A structural diagram from another angle.

[0028] Figure 10This is a structural diagram of the main shell of the GIS housing. Detailed Implementation

[0029] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0030] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0032] Reference Figure 1 , Figures 4 to 9A welding fixture for GIS shells includes a base 1, a connecting seat 2, a support column 3, a first positioning rod 4, a second positioning rod 5, a third positioning rod 6, a fourth positioning rod 7, a first positioning cover 8, a second positioning cover 9, a third positioning cover 10, and a fourth positioning cover 11. The connecting seat 2 is located on the top of the base 1, and the support column 3 is located on the top of the connecting seat 2. The first positioning rod 4, the second positioning rod 5, the third positioning rod 6, and the fourth positioning rod 7 are detachably mounted on the outer circumferential surface of the support column 3. After being connected to the support column 3, the first positioning rod 4, the second positioning rod 5, the third positioning rod 6, and the fourth positioning rod 7 can be respectively located within a first branch pipe 17, a second branch pipe 18, a third branch pipe 19, and a fourth branch pipe 20. The first positioning cover 8, the second positioning cover 9, the third positioning cover 10, and the fourth positioning cover 11 are detachably connected to the first positioning rod 4, the second positioning rod 5, the third positioning rod 6, and the fourth positioning rod 7, respectively. A portion of the first positioning cover 8, the second positioning cover 9, and the third positioning cover 10 are adapted to the inner diameters of the first flange 171, the second flange 181, and the third flange 191, respectively. Another portion of the first positioning cover 8, the second positioning cover 9, and the third positioning cover 10 can press against the end faces of the first flange 171, the second flange 181, and the third flange 181, respectively. A portion of the fourth positioning cover 11 is adapted to the inner diameter of the fourth branch pipe 20. Another portion of the fourth positioning cover 11 can press against the end face of the fourth branch pipe 20.

[0033] Reference Figure 1 , Figure 2 and Figure 8 In this embodiment, the connecting seat 2 and the base 1 are locked together by bolts. Specifically, the connecting flange 225 at the bottom of the main housing 22 is fixedly connected to the connecting seat 2 by multiple bolts. These bolts pass through the connecting seat 2 and the base 1 and are threadedly connected to the connecting seat 2 and the base 1. The base 1 is connected to the machine tool. The support column 3 is detachably connected to the connecting seat 2 and the base 1. Specifically, the connecting seat 2 is provided with a sixth threaded hole 21 that runs vertically through the base, the top of the base 1 is provided with a seventh threaded hole 12 that runs vertically through the base, and the bottom surface of the support column 3 is provided with a threaded section 31, which is threadedly connected to the sixth threaded hole 21 and the seventh threaded hole 12.

[0034] Reference Figures 1 to 3The outer circumferential surface of the support column 3 is provided with a first threaded hole 32, a second threaded hole 33, a third threaded hole 34, and a fourth threaded hole 35. The ends of the first positioning rod 4, the second positioning rod 5, the third positioning rod 6, and the fourth positioning rod 7 near the support column 3 are respectively threadedly connected to the first threaded hole 32, the second threaded hole 33, the third threaded hole 34, and the fourth threaded hole 35. Specifically, the ends of the first positioning rod 4, the second positioning rod 5, the third positioning rod 6, and the fourth positioning rod 7 near the support column 3 are respectively provided with a first external thread, a second external thread, a third external thread, and a fourth external thread. The ends of the first positioning rod 4, the second positioning rod 5, the third positioning rod 6, and the fourth positioning rod 7 near the support column 3 are detachably connected to the support column 3 through threaded connections.

[0035] Reference Figure 1 , Figures 4 to 9 The first positioning cover 8, the second positioning cover 9, the third positioning cover 10, and the fourth positioning cover 11 each include a positioning part 13 and a pressure plate 14 connected to each other. The positioning parts 13 of the first positioning cover 8, the second positioning cover 9, and the third positioning cover 10 are respectively adapted to the inner diameters of the first flange 171, the second flange 181, and the third flange 191, and can be located inside the first flange 171, the second flange 181, and the third flange 191, respectively. The pressure plates 14 of the first positioning cover 8, the second positioning cover 9, and the third positioning cover 10 can respectively press down on the end faces of the first flange 171, the second flange 181, and the third flange 191. The positioning part 13 of the fourth positioning cover 11 is adapted to the inner diameter of the fourth branch pipe 20 and is located inside the fourth branch pipe 20. The pressure plate 14 of the fourth positioning cover 11 can press down on the end face of the fourth branch pipe 20. Each of the first positioning cover 8, second positioning cover 9, third positioning cover 10, and fourth positioning cover 11 has a locking hole 15 along its length in the middle. Each of the first positioning rod 4, second positioning rod 5, third positioning rod 6, and fourth positioning rod 7 has a fifth threaded hole 16 at its end away from the support column 3. The ends of the first positioning rod 4, second positioning rod 5, third positioning rod 6, and fourth positioning rod 7 away from the support column 3 are respectively located within their corresponding locking holes 15. The first positioning cover 8, second positioning cover 9, third positioning cover 10, and fourth positioning cover 11 are locked to the fifth threaded holes 16 of the first positioning rod 4, second positioning rod 5, third positioning rod 6, and fourth positioning rod 7 respectively using bolts. Specifically, when the first positioning cover 8, second positioning cover 9, third positioning cover 10, and fourth positioning cover 11 are connected to the first positioning rod 4, second positioning rod 5, third positioning rod 6, and fourth positioning rod 7 respectively, bolts are inserted into the locking holes 15 of the first positioning cover 8, second positioning cover 9, third positioning cover 10, and fourth positioning cover 11 and threadedly connected to the corresponding fifth threaded holes 16.

[0036] Reference Figures 1 to 10The present invention also discloses a GIS shell welding method, which uses the aforementioned GIS shell welding fixture and includes the following steps:

[0037] S1. First, lock the main housing 22 of the GIS housing onto the connecting seat 2. Then, connect the first positioning rod 4, the second positioning rod 5, the third positioning rod 6 and the fourth positioning rod 7 to the support column 3 and position them in the first mounting hole 221, the second mounting hole 222, the third mounting hole 223 and the fourth mounting hole 224 respectively.

[0038] S2. Send the first branch pipe 17 to the first mounting hole 221 and place the first positioning rod 4 inside the first mounting hole 221. Then, place the positioning part 13 of the first positioning cover 8 inside the first flange 171 and lock the first flange 171. Then, connect the first positioning cover 8 to the first positioning rod 4. After the first positioning cover 8 is connected to the first positioning rod 4, let the pressure plate 14 of the first positioning cover 8 press against the end face of the first flange 171. At this time, the first branch pipe 17 and the first mounting hole 221 can be positioned. Then, the first branch pipe 17 is pre-welded to the first mounting hole 221 for fixation. Finally, the first branch pipe 17 is fully welded to the first mounting hole 221.

[0039] S3. Send the second branch pipe 18 to the second mounting hole 222 and place the second positioning rod 5 inside the second mounting hole 222. Then, place the positioning part 13 of the second positioning cover 9 inside the second flange 181 and lock the second flange 181. Then, connect the second positioning cover 9 to the second positioning rod 5. After the second positioning cover 9 is connected to the second positioning rod 5, let the pressure plate 14 of the second positioning cover 9 press against the end face of the second flange 181. At this time, the second branch pipe 18 and the second mounting hole 222 can be positioned. Then, the second branch pipe 18 is pre-welded to the second mounting hole 222 for fixation. Finally, the second branch pipe 18 is fully welded to the second mounting hole 222.

[0040] S4. Send the third branch pipe 19 to the third mounting hole 223 and place the third positioning rod 6 inside the third mounting hole 223. Then, place the positioning part 13 of the third positioning cover 10 inside the third flange 191 and lock the third flange 191. Then, connect the third positioning cover 10 to the third positioning rod 6. After the third positioning cover 10 is connected to the third positioning rod 6, let the pressure plate 14 of the third positioning cover 10 press against the end face of the third flange 191. At this time, the third branch pipe 19 and the third mounting hole 223 can be positioned. Then, the third branch pipe 19 is pre-welded to the third mounting hole 223 for fixation. Finally, the third branch pipe 19 is fully welded to the third mounting hole 223.

[0041] S5. Send the fourth branch pipe 20 to the fourth mounting hole 224 and position the fourth positioning rod 7 inside the fourth mounting hole 224. Then, position the positioning part 13 of the fourth positioning cover 11 inside the fourth branch pipe 20 and lock the fourth branch pipe 20 in place. Then, connect the fourth positioning cover 11 to the fourth positioning rod 7. After the fourth positioning cover 11 is connected to the fourth positioning rod 7, press the end face of the fourth branch pipe 20 with the pressure plate 14 of the fourth positioning cover 11. At this time, the fourth branch pipe 20 and the fourth mounting hole 224 can be positioned. Then, pre-weld the fourth branch pipe 20 to the fourth mounting hole 224 for fixation. Finally, fully weld the fourth branch pipe 20 to the fourth mounting hole 224.

[0042] The above are merely specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. A welding fixture for GIS shells, characterized in that: The system includes a base, a connecting seat, a support column, a first positioning rod, a second positioning rod, a third positioning rod, a fourth positioning rod, a first positioning cover, a second positioning cover, a third positioning cover, and a fourth positioning cover. The connecting seat is located on top of the base, and the support column is located on top of the connecting seat. The first, second, third, and fourth positioning rods are detachably mounted on the outer circumference of the support column. After being connected to the support column, the first, second, third, and fourth positioning rods can be positioned within the first, second, third, and fourth branch pipes, respectively. The first, second, third, and fourth positioning covers are detachably connected to the first, second, third, and fourth positioning rods, respectively. A portion of the first, second, and third positioning covers is adapted to the inner diameter of the first, second, and third flanges, respectively. Another portion of the first, second, and third positioning covers can press against the end faces of the first, second, and third flanges, respectively. A portion of the fourth positioning cover is adapted to the inner diameter of the fourth branch pipe, and another portion of the fourth positioning cover can press against the end face of the fourth branch pipe.

2. The GIS shell welding fixture as described in claim 1, characterized in that: The connector and the base are connected by bolts.

3. The GIS shell welding fixture as described in claim 1, characterized in that: The support column is detachably connected to the connecting seat and the base.

4. The GIS shell welding fixture as described in claim 1, characterized in that: The outer circumferential surface of the support column is provided with a first threaded hole, a second threaded hole, a third threaded hole and a fourth threaded hole, and the ends of the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod near the support column are respectively threaded to the first threaded hole, the second threaded hole, the third threaded hole and the fourth threaded hole.

5. The GIS shell welding fixture as described in claim 1, characterized in that: The first, second, third, and fourth positioning covers each include interconnected positioning parts and pressure plates. The positioning parts of the first, second, and third positioning covers are respectively adapted to the inner diameters of the first, second, and third flanges, and are located within the first, second, and third flanges, respectively. The pressure plates of the first, second, and third positioning covers can respectively press against the end faces of the first, second, and third flanges. The positioning part of the fourth positioning cover is adapted to the inner diameter of the fourth branch pipe and is located within the fourth branch pipe. The pressure plate of the fourth positioning cover can press against the fourth... On the end face of the branch pipe, the first positioning cover, the second positioning cover, the third positioning cover and the fourth positioning cover are all provided with locking holes along the length direction in the middle. The first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod are all provided with fifth threaded holes at the ends away from the support column. The ends of the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod away from the support column are respectively located in the corresponding locking holes. The first positioning cover, the second positioning cover, the third positioning cover and the fourth positioning cover are locked and connected to the fifth threaded holes of the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod respectively by bolts.

6. The GIS shell welding fixture as described in claim 2, characterized in that: The connecting seat is provided with a sixth threaded hole that runs vertically through the base, the top of the base is provided with a seventh threaded hole that runs vertically through the base, and the bottom surface of the support column is provided with a threaded section, which is threadedly connected to the sixth threaded hole and the seventh threaded hole.

7. A method for welding a GIS shell, using the GIS shell welding fixture described in any one of claims 1-6, characterized in that: Includes the following steps: S1. First, lock the main shell of the GIS housing onto the connecting seat, and then connect the first positioning rod, the second positioning rod, the third positioning rod and the fourth positioning rod to the support column and position them in the first mounting hole, the second mounting hole, the third mounting hole and the fourth mounting hole respectively. S2. Send the first branch pipe to the first mounting hole and position the first positioning rod inside the first mounting hole. Then, position the positioning part of the first positioning cover inside the first flange and lock the first flange in place. Then, connect the first positioning cover to the first positioning rod. After the first positioning cover is connected to the first positioning rod, press the pressure plate of the first positioning cover against the end face of the first flange. At this point, the first branch pipe and the first mounting hole can be positioned. Then, pre-weld the first branch pipe to the first mounting hole for fixation. Finally, fully weld the first branch pipe to the first mounting hole. S3. Send the second branch pipe to the second mounting hole and position the second positioning rod inside the second mounting hole. Then, position the positioning part of the second positioning cover inside the second flange and lock the second flange in place. Then, connect the second positioning cover to the second positioning rod. After the second positioning cover is connected to the second positioning rod, let the pressure plate of the second positioning cover press against the end face of the second flange. At this time, the second branch pipe and the second mounting hole can be positioned. Then, pre-weld the second branch pipe to the second mounting hole for fixation. Finally, fully weld the second branch pipe to the second mounting hole. S4. Send the third branch pipe to the third mounting hole and position the third positioning rod inside the third mounting hole. Then, position the positioning part of the third positioning cover inside the third flange and lock the third flange in place. Then, connect the third positioning cover to the third positioning rod. After the third positioning cover is connected to the third positioning rod, let the pressure plate of the third positioning cover press against the end face of the third flange. At this time, the third branch pipe and the third mounting hole can be positioned. Then, pre-weld the third branch pipe to the third mounting hole for fixation. Finally, fully weld the third branch pipe to the third mounting hole. S5. Send the fourth branch pipe to the fourth mounting hole and position the fourth positioning rod inside the fourth mounting hole. Then, position the positioning part of the fourth positioning cover inside the fourth branch pipe and lock the fourth branch pipe in place. Then, connect the fourth positioning cover to the fourth positioning rod. After the fourth positioning cover is connected to the fourth positioning rod, let the pressure plate of the fourth positioning cover press against the end face of the fourth branch pipe. At this time, the fourth branch pipe and the fourth mounting hole can be positioned. Then, pre-weld the fourth branch pipe to the fourth mounting hole for fixation. Finally, fully weld the fourth branch pipe to the fourth mounting hole.

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