A GIS three-phase outlet pipe joint shell welding tool and welding process

Abstract

The present invention discloses a GIS three-phase outlet pipe joint shell welding tool and welding process, wherein the GIS three-phase outlet pipe joint shell welding tool comprises a first tool, a connecting plate and a second tool; the first tool, the connecting plate and the second tool are arranged in sequence along the periphery of the welding station; the first tool comprises a first base plate, a first support plate and a first positioning support; the second tool comprises a second base plate, a second support plate and a second positioning support; the first base plate and the second base plate are both arranged horizontally; the first base plate and the second base plate are connected by a connecting plate. The GIS three-phase outlet pipe joint shell welding tool disclosed in the present invention can quickly locate the position and angle between the main body, the middle branch pipe, the left branch pipe, the second flange and the third flange, and the positioning is fast and accurate, the operation direction is simple, and the welding accuracy and welding efficiency of the GIS three-phase outlet pipe joint shell can be effectively improved. The GIS three-phase outlet pipe joint shell welding process disclosed in the present invention has good welding quality and high welding efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of three-phase outlet shell welding, and in particular to a GIS three-phase outlet pipe joint shell welding tool and a welding process. Background Art

[0002] Three-phase electricity is a form of electric energy transmission. It consists of three alternating potentials with the same frequency, equal amplitude, and phase difference of 120°. The three-phase outlet housing is an important device in the power system, which protects the power system and electrical appliances and electrical devices in the housing. The distance between each outlet barrel in the three-phase outlet housing, as well as the angle between the outlet barrel and the housing have an important influence on the performance of the three-phase outlet housing. The welding of the three outlet barrels of the existing three-phase outlet pipe joint housing with oblique outlets mostly requires the staff to use heavy lifting equipment to lift the three outlet barrels in turn, and then use a variety of positioning tools to determine the angles and positions between each outlet barrel to ensure that the outlet barrels are welded according to the predetermined angle and position. Each angle adjustment takes a long time, is difficult, and has low welding efficiency. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a GIS three-phase outlet pipe joint shell welding tool and a welding process, wherein the GIS three-phase outlet pipe joint shell welding tool, the GIS three-phase outlet pipe joint shell includes a main body, an intermediate branch pipe, a right branch pipe, and a left branch pipe; wherein:

[0004] The left branch pipe, the middle branch pipe, and the right branch pipe are respectively arranged on the side wall of the main pipe body from left to right; the middle branch pipe, the right branch pipe, and the left branch pipe are all arranged obliquely upward; the end of the right branch pipe is provided with a second flange; the end of the left branch pipe is provided with a third flange; the main pipe body is provided with a fourth flange;

[0005] The inclination angle of the right branch pipe with the vertical direction is A1; the angle between the second flange and the vertical direction is A2; the vertical distance between the bottom of the intersection of the right branch pipe and the second flange and the welding station plane is D1;

[0006] The inclination angle of the left branch pipe with the vertical direction is A3; the included angle of the third flange with the vertical direction is A4; the vertical distance between the bottom of the intersection of the left branch pipe and the third flange and the welding station plane is D2; the outer diameter of the middle branch pipe is D3;

[0007] The angle between the horizontal projections of the center line of the left branch and the center line of the middle branch is A5; the angle between the horizontal projections of the center line of the right branch and the center line of the middle branch is A6; A5 is the same as A6;

[0008] The welding tooling includes a first tooling, a connecting plate and a second tooling;

[0009] The first tooling, the connecting plate and the second tooling are sequentially arranged along the periphery of the welding station;

[0010] The first tooling includes a first bottom plate, a first support plate, and a first positioning support member;

[0011] The second tooling includes a second bottom plate, a second support plate, and a second positioning support member;

[0012] The first bottom plate and the second bottom plate are both arranged horizontally; the first bottom plate and the second bottom plate are connected by the connecting plate;

[0013] The side wall of the first bottom plate close to the welding station is the S1 surface; the side wall of the second bottom plate close to the welding station is the S2 surface;

[0014] The first support plate and the first positioning support member are arranged on the upper surface of the first bottom plate; the first positioning support member is close to the S1 surface; the upper end of the first support plate is inclined toward the S1 surface; the inclination angle of the first support plate is B1; B1 is the same as A2;

[0015] A first notch is provided at the upper end of the first support plate; the vertical distance between the bottom of the first notch and the plane of the welding station is L1; L1 is the same as D1; ​​the angle between the plane passing through the bottom of the first notch and the top of the first positioning support member and the vertical direction is B2; B2 is the same as A1;

[0016] The second support plate and the second positioning support member are arranged on the upper surface of the second bottom plate; the second positioning support member is close to the S2 surface; the upper end of the second support plate is inclined toward the S2 surface; the inclination angle of the second support plate is angle B3; B3 is the same as A4;

[0017] A second notch is provided at the upper end of the second support plate; the vertical distance between the bottom of the second notch and the welding station plane is L2; ​​L2 is the same as D2; the angle between the plane passing through the bottom of the second notch and the top of the second positioning support member and the vertical direction is B4; B4 is the same as A3;

[0018] The distance between the side wall of the first support plate and the side wall of the second support plate is L3; L3 is the same as D3;

[0019] The horizontal projections of the center line of the first notch and the center line of the second notch intersect at Q1, and Q1 is at the same distance from the first notch and the second notch respectively; the midpoint of the horizontal projection line between the first support plate side wall and the second support plate side wall is Q2; the angle between the line connecting Q1 and Q2 and the horizontal projection of the center line of the first notch is B5; the angle between the line connecting Q1 and Q2 and the horizontal projection of the center line of the second notch is B6; B5 is the same as B6.

[0020] Preferably, a first positioning pin is provided on the side wall of the first support plate away from the S1 surface; and a second positioning pin is provided on the side wall of the second support plate away from the S2 surface.

[0021] Preferably, the side wall of the first support plate is provided with a first extension portion; the side wall of the second support plate close to the first extension portion is provided with a second extension portion; and the distance between the side wall of the first extension portion and the side wall of the second extension portion is the same as D3.

[0022] Preferably, a first reinforcement member is provided between the side wall of the first support plate and the first bottom plate;

[0023] A second reinforcement member is provided between the side wall of the second support plate and the second bottom plate.

[0024] The present invention also provides a GIS three-phase outlet pipe joint shell welding process, using any of the above-mentioned GIS three-phase outlet pipe joint shell welding tooling, the process steps are as follows:

[0025] S10, opening a middle branch pipe mounting hole, a right branch pipe mounting hole and a left branch pipe mounting hole on the side wall of the main pipe body;

[0026] S20, pre-welding the middle branch pipe to the middle branch pipe installation hole to form a pre-welded body;

[0027] S30, placing the pre-welded body in the welding station, so that the middle branch pipe is located between the side wall of the first support plate and the side wall of the second support plate; and the bottom edge of the pre-welded body is against the S1 surface and the S2 surface;

[0028] S40, placing the tube body of the right branch pipe on the first notch and the first positioning support, and making the flange surface of the second flange fit the plate surface of the first support plate;

[0029] Or place the pipe body of the left branch pipe on the second notch and the second positioning support, and make the flange surface of the third flange fit the plate surface of the second support plate;

[0030] S50, adjusting the right branch pipe so that the welding portion of the right branch pipe corresponds to the mounting hole of the right branch pipe; or adjusting the left branch pipe so that the welding portion of the left branch pipe corresponds to the mounting hole of the left branch pipe;

[0031] S60, welding the right branch pipe to the branch pipe mounting hole; or welding the left branch pipe to the left branch pipe mounting hole;

[0032] S70, repeating steps S40-S60 until the welding of the right branch pipe and the left branch pipe is completed;

[0033] S80. After welding is completed, the shell is removed from the welding workstation.

[0034] The GIS three-phase outlet pipe joint shell welding tool provided by the present invention can quickly locate the position and angle between the main body, the middle branch pipe, the left branch pipe, the second flange, and the third flange, and the positioning is fast and accurate, the operation direction is simple, and the welding accuracy and welding efficiency of the GIS three-phase outlet pipe joint shell can be effectively improved. The GIS three-phase outlet pipe joint shell welding process provided by the present invention has good welding quality and high welding efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a front view of the finished product after welding of the present invention;

[0036] Figure 2 for Figure 1 Cross-section of the middle BB;

[0037] Figure 3 for Figure 1 A top view of

[0038] Figure 4 for Figure 3 Cross-section of EE;

[0039] Figure 5 A three-dimensional diagram of a welding tool for a GIS three-phase outlet pipe joint housing provided in an embodiment of the present invention;

[0040] Figure 6 It is a schematic diagram of the positions of the first positioning pin, the second positioning pin, the first extending portion, and the second extending portion;

[0041] Figure 7 A cross-sectional view of the first tool fixing the right branch pipe;

[0042] Figure 8 is a cross-sectional view of the first tooling;

[0043] Fig. 9 This is a schematic diagram of the locations of Q1, Q2, B5, and B6;

[0044] Among them: 11, main body; 111, fourth flange; 12, middle branch; 121, first flange; 13, right branch; 131, second flange; 14, left branch; 141, third flange; 21, first tooling; 211, first base plate; 212, first support plate; 2121, first notch; 2122, first positioning pin; 2123, first extension; 213, first positioning support; 214, first reinforcement; 22, connecting plate; 23, second tooling; 231, second base plate; 232, second support plate; 2321, second notch; 2322, second positioning pin; 2323, second extension; 233, second positioning support; 234, second reinforcement. DETAILED DESCRIPTION

[0045] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments. However, the following embodiments are only preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work all belong to the protection scope of the present invention. The experimental methods in the following embodiments are conventional methods unless otherwise specified. The materials, reagents, etc. used in the following embodiments are all commercially available unless otherwise specified.

[0046] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0049] The embodiment of the present invention provides a GIS three-phase outlet pipe joint shell welding tool, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the GIS three-phase outlet pipe joint housing to be welded in the embodiment of the present invention includes a main pipe body 11, an intermediate branch pipe 12, a right branch pipe 13, and a left branch pipe 14; wherein:

[0050] The left branch pipe 14, the middle branch pipe 12, and the right branch pipe 13 are respectively arranged on the side wall of the main pipe body 11 from left to right; the middle branch pipe 12, the right branch pipe 13, and the left branch pipe 14 are all arranged obliquely upward; the end of the middle branch pipe 12 is provided with a first flange 121; the end of the right branch pipe 13 is provided with a second flange 131; the end of the left branch pipe 14 is provided with a third flange 141; the main pipe body 11 is provided with a fourth flange 111;

[0051] like Figure 4 As shown, the inclination angle of the right branch pipe 13 with the vertical direction is A1; the included angle of the second flange 131 with the vertical direction is A2; the vertical distance between the bottom of the intersection of the right branch pipe 13 and the second flange 131 and the welding station plane is D1;

[0052] The inclination angle of the left branch pipe 14 with the vertical direction is A3 (same as A1, not marked in the figure); the included angle of the third flange 141 with the vertical direction is A4 (same as A2, not marked in the figure); the vertical distance between the bottom of the intersection of the left branch pipe 14 and the third flange 141 and the welding station plane is D2 (same as D1, not marked in the figure); the outer diameter of the middle branch pipe 12 is D3 (such as Figure 3 shown);

[0053] The angle between the horizontal projection of the center line of the left branch pipe 14 and the center line of the middle branch pipe 12 is A5; the angle between the horizontal projection of the center line of the right branch pipe 13 and the center line of the middle branch pipe 12 is A6; A5 is the same as A6;

[0054] like Figure 5 , Figure 6 , Figure 7 , Figure 8 , Fig. 9 As shown, the welding tooling includes a first tooling 21, a connecting plate 22 and a second tooling 23;

[0055] The first tool 21, the connecting plate 22 and the second tool 23 are sequentially arranged along the circumferential direction of the outer periphery of the welding station;

[0056] The first tooling 21 includes a first bottom plate 211, a first support plate 212, and a first positioning support member 213;

[0057] The second tooling 23 includes a second bottom plate 231, a second support plate 232, and a second positioning support member 233;

[0058] The first bottom plate 211 and the second bottom plate 231 are both arranged horizontally; the first bottom plate 211 and the second bottom plate 231 are respectively welded to both sides of the connecting plate 22;

[0059] The side wall of the first bottom plate 211 close to the welding station is the S1 surface; the side wall of the second bottom plate 231 close to the welding station is the S2 surface;

[0060] The first support plate 212 and the first positioning support member 213 are disposed on the upper surface of the first bottom plate 211; the first positioning support member 213 is close to the S1 surface; the upper end of the first support plate 212 is inclined toward the S1 surface; the inclination angle of the first support plate 212, that is, the angle between the first support plate 212 and the vertical direction is B1; B1 is the same as A2;

[0061] like Figure 8 As shown, a first notch 2121 is provided at the upper end of the first support plate 212; the vertical distance between the bottom of the first notch 2121 and the welding station plane is L1; L1 is the same as D1; ​​the angle between the plane passing through the bottom of the first notch 2121 and the top of the first positioning support member 213 and the vertical direction is B2; B2 is the same as A1;

[0062] The second support plate 232 and the second positioning support member 233 are arranged on the upper surface of the second bottom plate 231; the second positioning support member 233 is close to the S2 surface; the upper end of the second support plate 232 is inclined toward the S2 surface; the inclination angle of the second support plate 232, that is, the angle between the second support plate 232 and the vertical direction is B3 (not marked in the figure); B3 is the same as A4; through the design of the inclination of the first support plate 212 and the second support plate 232, on the one hand, the inclination angle of the corresponding second flange 131 and the third flange 141 can be quickly located, and on the other hand, during welding, the right branch pipe 13 and the left branch pipe 14 can be supported, and the right branch pipe 13 and the left branch pipe 14 can be rotated conveniently for fine-tuning the angle; through the structural design of the first support plate 212 and the first positioning support member 213, the second support plate 232 and the second positioning support member 233, the angle of the right branch pipe 13 and the left branch pipe 14 can be quickly located;

[0063] A second notch 2321 is provided at the upper end of the second support plate 232; the vertical distance between the bottom of the second notch 2321 and the plane of the welding station is L2 (not marked in the figure); L2 is the same as D2; the angle between the plane passing through the bottom of the second notch 2321 and the top of the second positioning support member 233 and the vertical direction is B4 (not marked in the figure); B4 is the same as A3; the above structure can quickly locate the relative positions of the second flange 131, the left branch pipe 14 and the main body 11, and the right branch pipe 13 and the left branch pipe 14 through the design of L1, L2, B1, B2, B3, B4, etc.;

[0064] like Figure 5 As shown, the distance between the side walls opposite to the first support plate 212 and the second support plate 232 is L3; L3 is the same as D3; the same design of L3 and D3 can limit the middle branch pipe 12 between the first support plate 212 and the second support plate 232, thereby locating the position of the middle branch pipe 12;

[0065] like Fig. 9As shown, the horizontal projections of the center lines of the first notch 2121 and the second notch 2321 intersect at Q1, and Q1 is at the same distance from the first notch 2121 and the second notch 2321 respectively; the midpoint of the horizontal projection line between the opposite side walls of the first support plate 212 and the second support plate 232 is Q2; the angle between the line connecting Q1 and Q2 and the horizontal projection of the center line of the first notch 2121 is B5; the angle between the line connecting Q1 and Q2 and the horizontal projection of the center line of the second notch 2321 is B6; B5 is the same as B6; this structure can ensure that during welding, the angle A6 of the horizontal projection between the center line of the right branch pipe 13 and the center line of the middle branch pipe 12 is the same as the angle A5 of the horizontal projection between the center line of the left branch pipe 14 and the center line of the middle branch pipe 12. The horizontal projections of the extended surfaces of the S1 surface and the S2 surface are located on the line connecting Q1 and Q2; the inclination angles of the S1 surface and the S2 surface can be set as needed.

[0066] When the S1 surface is perpendicular to the horizontal projection of the center line of the first notch 2121, and the S2 surface is perpendicular to the horizontal projection of the center line of the second notch 2321, the distance between the bottom of the first notch 2121 and the side wall of the fourth flange 111 is the same as the distance between the horizontal projection of the connecting bottom of the right branch pipe 13 and the second flange 131 and the side wall of the fourth flange 111.

[0067] The GIS three-phase outlet pipe joint shell welding tool provided by the present invention can quickly locate the position and angle between the main pipe body, the middle branch pipe, the left branch pipe, the second flange, and the third flange, and the positioning is fast and accurate, the operation direction is simple, and the welding accuracy and welding efficiency of the GIS three-phase outlet pipe joint shell can be effectively improved.

[0068] When implementing it, Figure 6 As shown, the side wall of the first support plate 212 away from the S1 surface is provided with a first positioning pin 2122; the side wall of the second support plate 232 away from the S2 surface is provided with a second positioning pin 2322. Flanges are connecting parts used for connection, and are usually provided with through holes for fastener connection; in this embodiment, the setting position of the first positioning pin 2122 corresponds to the position of a through hole on the second flange 131; the setting position of the second positioning pin 2322 corresponds to the position of a through hole on the third flange 141; the first positioning pin 2122 and the second positioning pin 2322 can quickly locate the positions of the right branch pipe 13 and the left branch pipe 14 through the second flange 131 and the third flange 141, further improving the positioning speed and positioning efficiency, and the positioning pins can improve the positioning accuracy of the two branches and reduce the time of manual adjustment.

[0069] When implementing it, Figure 6As shown, a first extension portion 2123 is provided on the side wall of the first support plate 212; an angle is formed between the first extension portion 2123 and the first support plate 212; a second extension portion 2323 is provided on the side wall of the second support plate 232 close to the first extension portion 2123; an angle is formed between the second extension portion 2323 and the second support plate 232; and a distance between the side wall of the first extension portion 2123 and the side wall of the second extension portion 2323 is the same as D3. When the side walls of the first support plate 212 and the second support plate 232 cannot contact the middle branch pipe 12 due to reasons such as the right branch pipe 13, the left branch pipe 14 and the middle branch pipe 12 being too close to each other, the first extension portion 2123 and the second extension portion 2323 can change the direction of the contact portion between the first support plate 212 and the second support plate 232 and the middle branch pipe 12, thereby solving the problem that the side walls of the first support plate 212 and the second support plate 232 cannot contact the middle branch pipe 12 due to reasons such as the right branch pipe 13, the left branch pipe 14 and the middle branch pipe 12 being too close to each other.

[0070] When implementing it, Figure 5 As shown, a first reinforcement member 214 is provided between the side wall of the first support plate 212 and the first bottom plate 211;

[0071] A second reinforcement member 234 is disposed between the side wall of the second support plate 232 and the second bottom plate 231 .

[0072] Since the branch pipe has a large mass, the stability of the first support plate 212 and the second support plate 232 can be improved by the first reinforcement member 214 and the second reinforcement member 234 .

[0073] The embodiment of the present invention further provides a GIS three-phase outlet pipe joint shell welding process, using any of the above GIS three-phase outlet pipe joint shell welding tooling, the process steps are as follows:

[0074] S10, opening a middle branch pipe mounting hole, a right branch pipe mounting hole and a left branch pipe mounting hole on the side wall of the main pipe body 11;

[0075] S20, pre-welding the middle branch pipe 12 to the middle branch pipe mounting hole to form a pre-welded body; in this step, the middle branch pipe 12 is welded by an existing welding method; some welding methods, for example, use a hoisting position to hoist the middle branch pipe 12 to the position of the middle branch pipe mounting hole, and then manually adjust the angle between the middle branch pipe 12 and the main body 11 during welding, and manually align the middle branch pipe mounting hole, etc.;

[0076] S30, placing the pre-welded body in the welding station by using the existing lifting equipment, so that the middle branch pipe 12 is located between the side wall of the first support plate 212 and the side wall of the second support plate 232, and the bottom edge of the pre-welded body is against the S1 surface and the S2 surface; thereby achieving the purpose of quickly and accurately positioning the relative distance and angle between the middle branch pipe 12 and the first notch 2121 and the second notch 2321;

[0077] S40, placing the pipe body of the right branch pipe 13 on the first notch 2121 and the first positioning support 213 by using existing lifting equipment, and making the flange surface of the second flange 131 fit the plate surface of the first support plate 212;

[0078] Alternatively, the pipe body of the left branch pipe 14 is placed on the second notch 2321 and the second positioning support 233 by using existing lifting equipment, and the flange surface of the third flange 141 is attached to the plate surface of the second support plate 232;

[0079] S50, adjusting the right branch pipe 13 so that the welding portion of the right branch pipe 13 corresponds to the right branch pipe mounting hole; or adjusting the left branch pipe 14 so that the welding portion of the left branch pipe 14 corresponds to the left branch pipe mounting hole;

[0080] S60, welding the right branch pipe 13 to the branch pipe mounting hole; or welding the left branch pipe 14 to the left branch pipe mounting hole;

[0081] S70, repeating steps S40-S60 until the welding of the right branch pipe 13 and the left branch pipe 14 is completed;

[0082] S80, after welding is completed, the shell is removed from the welding station and waits for the next welding.

[0083] The above steps also include cleaning the welding point before welding.

[0084] The opening of the mounting holes, the cleaning method, the welding techniques, etc. in the above steps all adopt the existing technology, and the present invention will not repeat them.

[0085] The GIS three-phase outlet pipe joint shell welding process provided by the embodiment of the present invention greatly shortens the time for positioning the hoisting angle and direction of the left branch pipe and the right branch pipe by adopting the GIS three-phase outlet pipe joint shell welding tool provided by the present invention, thereby reducing the overall welding efficiency of the entire GIS three-phase outlet pipe joint shell and improving the welding efficiency. In addition, positioning by the GIS three-phase outlet pipe joint shell welding tool improves the positioning accuracy compared to manual positioning adjustment, thereby improving the finished product quality of the GIS three-phase outlet pipe joint shell and greatly reducing the welding defective rate.

[0086] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A GIS three-phase outlet pipe joint shell welding tool, characterized by: The GIS three-phase outlet pipe joint housing comprises a main pipe body (11), an intermediate branch pipe (12), a right branch pipe (13), and a left branch pipe (14); wherein: The left branch pipe (14), the middle branch pipe (12), and the right branch pipe (13) are respectively arranged on the side wall of the main pipe (11) from left to right; the middle branch pipe (12), the right branch pipe (13), and the left branch pipe (14) are all arranged obliquely upward; a second flange (131) is provided at the end of the right branch pipe (13); a third flange (141) is provided at the end of the left branch pipe (14); and the main pipe (11) is provided with a fourth flange (111); The inclination angle of the right branch pipe (13) with the vertical direction is A1; the included angle of the second flange (131) with the vertical direction is A2; the vertical distance between the bottom of the intersection of the right branch pipe (13) and the second flange (131) and the welding station plane is D1; The inclination angle of the left branch pipe (14) with the vertical direction is A3; the included angle of the third flange (141) with the vertical direction is A4; the vertical distance between the bottom of the intersection of the left branch pipe (14) and the third flange (141) and the welding station plane is D2; the outer diameter of the middle branch pipe (12) is D3; The included angle between the horizontal projections of the center line of the left branch pipe (14) and the center line of the middle branch pipe (12) is A5; the included angle between the horizontal projections of the center line of the right branch pipe (13) and the center line of the middle branch pipe (12) is A6; A5 is the same as A6; The welding tool comprises a first tool (21), a connecting plate (22) and a second tool (23); The first tooling (21), the connecting plate (22) and the second tooling (23) are arranged in sequence along the periphery of the welding station; The first tooling (21) comprises a first bottom plate (211), a first support plate (212), and a first positioning support member (213); The second tooling (23) comprises a second bottom plate (231), a second support plate (232), and a second positioning support member (233); The first bottom plate (211) and the second bottom plate (231) are both arranged horizontally; the first bottom plate (211) and the second bottom plate (231) are connected via the connecting plate (22); The side wall of the first bottom plate (211) close to the welding station is the S1 surface; the side wall of the second bottom plate (231) close to the welding station is the S2 surface; The first support plate (212) and the first positioning support member (213) are arranged on the upper surface of the first bottom plate (211); the first positioning support member (213) is close to the S1 surface; the upper end of the first support plate (212) is inclined toward the S1 surface; the inclination angle of the first support plate (212) is B1; B1 is the same as A2; A first notch (2121) is provided at the upper end of the first support plate (212); the vertical distance between the bottom of the first notch (2121) and the welding station plane is L1; L1 is the same as D1; ​​the angle between the plane passing through the bottom of the first notch (2121) and the top of the first positioning support member (213) and the vertical direction is B2; B2 is the same as A1; The second support plate (232) and the second positioning support member (233) are arranged on the upper surface of the second bottom plate (231); the second positioning support member (233) is close to the S2 surface; the upper end of the second support plate (232) is inclined toward the S2 surface; the inclination angle of the second support plate (232) is angle B3; B3 is the same as A4; A second notch (2321) is provided at the upper end of the second support plate (232); the vertical distance between the bottom of the second notch (2321) and the welding station plane is L2; ​​L2 is the same as D2; the angle between the plane passing through the bottom of the second notch (2321) and the top of the second positioning support member (233) and the vertical direction is B4; B4 is the same as A3; The distance between the side wall of the first support plate (212) and the side wall of the second support plate (232) is L3; L3 is the same as D3; The horizontal projections of the center line of the first notch (2121) and the center line of the second notch (2321) intersect at Q1, and Q1 is at the same distance from the first notch (2121) and the second notch (2321) respectively; the midpoint of the horizontal projection line between the side wall of the first support plate (212) and the side wall of the second support plate (232) is Q2; the angle between the line connecting Q1 and Q2 and the horizontal projection of the center line of the first notch (2121) is B5; the angle between the line connecting Q1 and Q2 and the horizontal projection of the center line of the second notch (2321) is B6; B5 is the same as B6.

2. The GIS three-phase outlet pipe joint housing welding tool according to claim 1 is characterized in that: A first positioning pin (2122) is provided on the side wall of the first support plate (212) away from the S1 surface; and a second positioning pin (2322) is provided on the side wall of the second support plate (232) away from the S2 surface.

3. The GIS three-phase outlet pipe joint housing welding tool according to claim 1 or 2, characterized in that: The first support plate (212) is provided with a first extension portion (2123) on its side wall; the second support plate (232) is provided with a second extension portion (2323) on its side wall close to the first extension portion (2123); and the distance between the side wall of the first extension portion (2123) and the side wall of the second extension portion (2323) is the same as D3.

4. The GIS three-phase outlet pipe joint housing welding tool according to claim 1 is characterized in that: A first reinforcement member (214) is provided between the side wall of the first support plate (212) and the first bottom plate (211); A second reinforcement member (234) is provided between the side wall of the second support plate (232) and the second bottom plate (231).

5. A GIS three-phase outlet pipe joint shell welding process, characterized in that: The GIS three-phase outlet pipe joint shell welding tool as described in any one of claims 1 to 4 is used, and the process steps are as follows: S10, opening a middle branch pipe mounting hole, a right branch pipe mounting hole and a left branch pipe mounting hole on the side wall of the main pipe body (11); S20, pre-welding the middle branch pipe (12) to the middle branch pipe mounting hole to form a pre-welded body; S30, placing the pre-welded body in a welding station, so that the middle branch pipe (12) is located between the side wall of the first support plate (212) and the side wall of the second support plate (232); and the bottom edge of the pre-welded body is against the S1 surface and the S2 surface; S40, placing the tube body of the right branch tube (13) on the first notch (2121) and the first positioning support member (213), and making the flange surface of the second flange (131) fit the plate surface of the first support plate (212); Or the tube body of the left branch tube (14) is placed on the second notch (2321) and the second positioning support member (233), and the flange surface of the third flange (141) is made to fit the plate surface of the second support plate (232); S50, adjusting the right branch pipe (13) so that the welding portion of the right branch pipe (13) corresponds to the right branch pipe mounting hole; or adjusting the left branch pipe (14) so ​​that the welding portion of the left branch pipe (14) corresponds to the left branch pipe mounting hole; S60, welding the right branch pipe (13) to the branch pipe mounting hole; or welding the left branch pipe (14) to the left branch pipe mounting hole; S70, repeating steps S40-S60 until the welding of the right branch pipe (13) and the left branch pipe (14) is completed; S80. After welding is completed, the shell is removed from the welding workstation.

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