Toroidal Field Coil Box Welding Positioning Tooling

Abstract

The present invention belongs to the technical field of positioning tooling, and particularly relates to a welding positioning tooling for a toroidal field coil box. It includes an upper positioning frame and a lower positioning frame arranged up and down, and the lower positioning frame and the upper positioning frame are tightly connected up and down through a connecting piece; the lower positioning frame has a lower positioning surface, and the upper positioning frame has an upper positioning surface; when welding the coil box, the lower positioning surface abuts against the bottom surface of the coil box, and the upper positioning surface abuts against the top surface of the coil box; it also includes a straight-section positioning block for supporting the inner peripheral surface of the straight section of the coil box. This tooling is used for the welding of the top plate and the box body of the toroidal field coil box. When welding the coil box, the upper positioning surface is tightened against the top surface of the coil box, and the lower positioning surface is tightened against the bottom surface of the coil box, reducing the welding deformation of the coil box in the up and down direction; supporting the inner peripheral surfaces of the straight section and the arc section of the coil box, reducing the inward contraction deformation of the straight section and the arc section in the horizontal direction.

Description

Technical Field

[0001] The present invention belongs to the technical field of positioning tooling, and particularly relates to a welding positioning tooling for a toroidal field coil box. Background Art

[0002] The research on controlled nuclear fusion is one of the important scientific research projects that have attracted much attention from the world. The tokamak device is an important device in the field of controlled nuclear fusion research and is a typical magnetic confinement device. The toroidal field coil, abbreviated as TF coil, is an important component of the main body of the tokamak device. It generates a toroidal magnetic field to provide overall confinement for the plasma, and uses the "magnetic cage" composed of closed magnetic field lines to confine the high-temperature plasma. Therefore, the stability of the TF coil will directly affect the stability of the operation of the entire tokamak device.

[0003] The TF coil is composed of two straight segments and three arcs with different radii, approximately in the shape of the letter "D", and is installed in a stainless-steel coil box with a cross-sectional shape approximately in the shape of the letter "D". As Figure 1-2 shown, the coil box 9 includes a straight segment 94 and an arc segment 95. The two ends of the straight segment 94 are connected by the arc segment 95. The arc segment 95 includes a first arc segment 951, a second arc segment 952, and a third arc segment 953 connected in sequence. Among them, the first arc segment 951 and the third arc segment 953 are smoothly connected to the straight segment 94. The coil box 9 includes a top plate 91 and a box body 92. The box body 92 is composed of a bottom plate, an outer peripheral side plate, and an inner peripheral side plate. The bottom plate, the outer peripheral side plate, and the inner peripheral side plate enclose a coil installation groove 93 adapted to the outer shape of the TF coil. After the TF coil is installed in the coil installation groove 93, the top plate 91 needs to be welded to the coil box 9. The outer periphery of the top plate 91 is connected to the outer periphery of the bottom plate of the box body 92 through the outer peripheral side plate, and the inner periphery of the top plate 91 is connected to the inner periphery of the bottom plate of the box body 92 through the inner peripheral side plate, so that the coil installation groove 93 forms a closed coil installation cavity. After the welding of the top plate 91 and the box body 92 is completed, subsequent machining and assembly of the coil box 9 are carried out.

[0004] Generally speaking, the shell thickness of the coil box 9 is small. When welding the box body 92 and the top plate 91, large welding deformation will occur. Moreover, the TF coil has been encapsulated in the coil box 9. To avoid damaging the TF coil due to high temperature and vibration, mechanical correction and flame correction are not allowed. The coil box 9 with large welding deformation will affect subsequent processing, assembly, and use, and even be scrapped. The welds between the top plate 91 and the box body 92 are distributed on the top of the coil box 9 and the main welds are asymmetrically distributed, resulting in the up and down bending deformation of some coil boxes 9 in the length direction of the straight segment 94, and the inward shrinkage deformation of the straight segment 94 and the arc segment 95 in the horizontal direction. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: to provide a welding positioning tooling for a toroidal field coil box, so as to reduce the welding deformation of the coil box when welding the welding top plate and the box body.

[0006] The technical solution adopted by the present invention to solve this technical problem is: a welding positioning tooling for a toroidal field coil box, including an upper positioning frame and a lower positioning frame arranged up and down, and the lower positioning frame and the upper positioning frame are tightly connected up and down through a connecting piece;

[0007] The lower positioning frame has a lower positioning surface, and the upper positioning frame has an upper positioning surface;

[0008] When welding the coil box, the lower positioning surface abuts against the bottom surface of the coil box, and the upper positioning surface abuts against the top surface of the coil box; the distance between the lower positioning surface and the upper positioning surface is equal to the thickness of the coil box;

[0009] It also includes a straight-section positioning block and an arc-section positioning block; the straight positioning block is arranged on the lower positioning frame or the upper positioning frame and is used to support the inner peripheral surface of the straight section of the coil box; the arc-section positioning block is arranged on the lower positioning frame or the upper positioning frame and is used to support the inner peripheral surface of the arc section of the coil box.

[0010] Further, the connecting piece is a vertically arranged fastening bolt.

[0011] Further, the shape of the straight-section support surface on the straight-section positioning block is adapted to the shape of the inner peripheral surface of the straight section, and the shape of the arc-section support surface on the arc-section positioning block is adapted to the shape of the inner peripheral surface of the arc section.

[0012] Further, a first isolation plate is provided on one side of the straight-section positioning block close to the inner peripheral surface of the straight section, and a second isolation plate is provided on one side of the arc-section positioning block close to the inner peripheral surface of the arc section; an upper isolation plate is provided on the lower positioning surface, and a lower isolation plate is provided on the upper positioning surface;

[0013] The first isolation plate, the second isolation plate, the upper isolation plate and the lower isolation plate are all made of stainless steel.

[0014] Further, both the straight-section positioning block and the arc-section positioning block are installed on the lower positioning frame.

[0015] Further, the lower positioning frame is also provided with a straight-side guiding and positioning member and an arc-side guiding and positioning member for installing and positioning the upper positioning frame;

[0016] When the coil box is installed on the lower positioning surface, the straight-side guiding and positioning member is located between the straight section and the lower positioning frame, and the arc-side guiding and positioning member is located between the arc section and the lower positioning frame.

[0017] Further, it further includes a first horizontal telescopic device and a second horizontal telescopic device;

[0018] One end of the first horizontal telescopic device is connected to the linear segment positioning block, and the other end of the first horizontal telescopic device is connected to the linear side guiding and positioning member;

[0019] One end of the second horizontal telescopic device is connected to the arc segment positioning block, and the other end of the second horizontal telescopic device is connected to the arc side guiding and positioning member.

[0020] Further, both the first horizontal telescopic device and the second horizontal telescopic device are adjusting screws.

[0021] Further, both the first horizontal telescopic device and the second horizontal telescopic device are automatic push rods.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: A circumferential field coil box welding positioning tooling is provided. When welding the coil box, the upper positioning surface abuts against the top surface of the coil box, and the lower positioning surface abuts against the bottom surface of the coil box, ensuring that the gap between the upper positioning surface and the lower positioning surface remains fixed, reducing the welding deformation of the coil box in the up and down direction; by providing a linear segment positioning block and an arc segment positioning block, the inner circumferential surfaces of the linear segment and the arc segment of the coil box are supported, reducing the inward shrinkage deformation of the linear segment and the arc segment in the horizontal direction; both the linear segment positioning block and the arc segment positioning block are installed on the lower positioning frame, which not only reduces the inward shrinkage deformation of the welded coil box but also plays a role in positioning the box body; by providing a first partition board, a second partition board, an upper partition board, and a lower partition board to isolate the stainless steel coil box from the carbon steel positioning tooling, avoiding the coil box from being contaminated by carbon steel and saving the manufacturing cost of the positioning tooling; both the linear segment positioning block and the arc segment positioning block can be telescoped in the horizontal direction, tightly supporting the inner circumferential surface of the coil box, further reducing the inward shrinkage deformation of the linear segment and the arc segment in the horizontal direction during welding. Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the coil box before welding in the background art of the present invention;

[0024] Figure 2 is a schematic structural diagram of the coil box after welding in the background art of the present invention;

[0025] Figure 3 is a schematic structural diagram of the present invention;

[0026] Figure 4 is a schematic structural diagram of the present invention during use;

[0027] Figure 5 is a top view structural diagram of the present invention during use;

[0028] Reference numerals: 1 - lower positioning frame; 11 - lower positioning surface; 12 - linear side guiding and positioning member; 13 - arc side guiding and positioning member; 2 - upper positioning frame; 21 - upper positioning surface; 3 - connecting member; 4 - linear segment positioning block; 5 - arc segment positioning block; 6 - horizontal telescopic device; 61 - first horizontal telescopic device; 62 - second horizontal telescopic device; 71 - first partition board; 72 - second partition board; 9 - coil box; 91 - top plate; 92 - box body; 93 - coil installation groove; 94 - linear segment; 95 - arc segment; 951 - first arc segment; 952 - second arc segment; 953 - third arc segment. Detailed implementation manners

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] As shown in the Figure 3 accompanying drawings, a welding positioning tooling for a toroidal field coil box includes an upper positioning frame 2 and a lower positioning frame 1 arranged up and down. The lower positioning frame 1 and the upper positioning frame 2 are tightly connected up and down through a connecting member 3. The lower positioning frame 1 has a lower positioning surface 11, and the upper positioning frame 2 has an upper positioning surface 21. When welding the coil box 9, the lower positioning surface 11 abuts against the bottom surface of the coil box 9, and the upper positioning surface 21 abuts against the top surface of the coil box 9. The distance between the lower positioning surface 11 and the upper positioning surface 21 is equal to the thickness of the coil box 9. It also includes a linear segment positioning block 4 and an arc segment positioning block 5. The linear positioning block 4 is arranged on the lower positioning frame 1 or the upper positioning frame 2 and is used to support the inner peripheral surface of the linear segment 94 of the coil box 9. The arc segment positioning block 5 is arranged on the lower positioning frame 1 or the upper positioning frame 2 and is used to support the inner peripheral surface of the arc segment 95 of the coil box 9.

[0031] As Figure 4-5As shown in the figure, during assembly and welding, first place the box body 92 on the lower positioning surface 11 of the lower positioning frame 1 for leveling and alignment, with the notch of the coil installation groove 93 facing upwards; install the TF coil in the coil installation groove 93, and after aligning the top plate 91 with the box body 92, spot-weld the two to form an integral coil box 9; then connect the upper positioning frame 2 and the lower positioning frame 1 through the connecting member 3, and firmly install the coil box 9 on the positioning fixture. At this time, the upper positioning surface 21 abuts against the top surface of the coil box 9, the lower positioning surface 11 abuts against the bottom surface of the coil box 9, the straight-line positioning block 4 is close to the inner peripheral surface of the straight-line segment 94, the arc-segment positioning block 5 is close to the inner peripheral surface of the arc segment 95, and the welding gap between the box body 92 and the top plate 91 is exposed. Finally, perform welding processing on the coil box 9. During welding, the gap between the upper positioning surface 21 and the lower positioning surface 11 remains fixed, thereby reducing the welding deformation of the coil box 9 in the up and down directions and ensuring the flatness of the upper and lower surfaces of the coil box 9; the coil box 9 contracts inwards in the horizontal direction, so that the straight-line segment positioning block 4 supports the inner peripheral surface of the straight-line segment 94 and the arc-segment positioning block 5 supports the inner peripheral surface of the arc segment 95, reducing the inward shrinkage deformation of the straight-line segment 94 and the arc segment 95 in the horizontal direction.

[0032] The lower positioning frame 1 and the upper positioning frame 2 can be welded or assembled from square tubes, rectangular tubes, channel steels, plates, etc., or can be made from the above-mentioned raw materials or other raw materials. The structures of the lower positioning frame 1 and the upper positioning frame 2 can be the same or different. For the convenience of blanking and manufacturing, preferably, the structures of the lower positioning frame 1 and the upper positioning frame 2 are the same. The connecting member 3 can be a connecting plate with through holes, and the connecting plate is connected to the lower positioning frame 1 and the upper positioning frame 2 through bolts; the connecting member 3 can also be a screw or a bolt. Preferably, the connecting member 3 is a vertically arranged fastening bolt, and the upper positioning frame 2 and the lower positioning frame 1 are tightly connected up and down through the fastening bolt, with a simple structure and convenient installation.

[0033] The vertical cross-sections of the straight-line positioning block 4 and the arc-segment positioning block 5 can be structures such as L-shaped, rectangular, inverted T-shaped, etc. The straight-line positioning block 4 has a straight-line support surface adapted to the inner peripheral surface of the straight-line segment 94, and the arc-segment positioning block 5 has an arc-segment support surface adapted to the inner peripheral surface of the arc segment 95. The above-mentioned support surfaces and the inner peripheral surface of the coil box 9 can be line support or surface support. Preferably, the shape of the straight-line support surface on the straight-line positioning block 4 is adapted to the shape of the inner peripheral surface of the straight-line segment 94; the shape of the arc-segment support surface on the arc-segment positioning block 5 is adapted to the shape of the inner peripheral surface of the arc segment 95, ensuring that both the straight-line positioning block 4 and the arc-segment positioning block 5 are in surface contact with the coil box 9 during inward shrinkage deformation, providing stable support.

[0034] One or more linear segment positioning blocks 4 and arc segment positioning blocks 5 can be provided respectively. A single linear segment positioning block 4 can be used to support the inner circumference of a part of the linear segment 94 or the entire inner circumference of the linear segment 94. A single arc segment positioning block 5 can be used to support the inner circumference of a part of the arc segment 95 or the entire inner circumference of the arc segment 95. The arc segment 95 includes a first arc segment 951, a second arc segment 952, and a third arc segment 953. Specifically, three arc segment positioning blocks 5 are provided, and the three arc segment positioning blocks 5 are evenly distributed along the horizontal direction on the inner circumference of the arc segment 95, reducing the deformation degree of the arc segment 95 on the basis of saving materials. Generally, the three arc segment positioning blocks 5 are respectively used to support the inner circumferences of the first arc segment 951, the second arc segment 952, and the third arc segment 953.

[0035] The lower positioning frame 1, the upper positioning frame 2, the linear segment positioning block 4, and the arc segment positioning block 5 are generally made of low-cost carbon steel. When the coil box 9 is welded, the lower positioning frame 1, the upper positioning frame 2, the linear segment positioning block 4, and the arc segment positioning block 5 made of carbon steel are in direct contact with the coil box 9 made of stainless steel, resulting in the penetration of carbon steel iron ions in the positioning tooling into the stainless steel coil box 9, seriously affecting the corrosion resistance of the stainless steel coil box 9. To avoid contamination of the coil box 9 by carbon steel, the positioning tooling can be made of stainless steel, but stainless steel is not easy to process and has a high cost. Preferably, a first isolation plate 71 is provided on the side of the linear segment positioning block 4 close to the inner circumference of the linear segment 94, and a second isolation plate 72 is provided on the side of the arc segment positioning block 5 close to the inner circumference of the arc segment 95; an upper isolation plate is provided on the lower positioning surface 11, and a lower isolation plate is provided on the upper positioning surface 21; the first isolation plate 71, the second isolation plate 72, the upper isolation plate, and the lower isolation plate are all made of stainless steel. The first isolation plate 71 is used to prevent direct contact between the linear segment positioning block 4 and the stainless steel coil box 9, the second isolation plate 72 is used to prevent direct contact between the arc segment positioning block 5 and the coil box 9, and the upper and lower isolation plates are used to prevent direct contact between the lower positioning frame 1 and the upper positioning frame 2 made of carbon steel and the stainless steel coil box 9. On the basis of reducing the welding deformation of the coil box 9, contamination of the stainless steel coil box 9 by carbon steel is avoided, saving the production cost of the positioning tooling. The first isolation plate 71 and the second isolation plate 72 can be flush with the coil box 9 up and down, or can protrude above and below the top and bottom surfaces of the coil box 9, but it should be ensured that the welds on the coil box 9 are exposed for convenient welding. Generally, for easy processing and installation, the upper and lower isolation plates are both integral plates.

[0036] If both the straight-line segment positioning block 4 and the arc segment positioning block 5 are installed on the upper positioning frame 2, when installing the upper positioning frame 2, it is necessary to manually adjust the position of the upper positioning frame 2 to ensure the positions of the straight-line segment positioning block 4 and the arc segment positioning block 5 relative to the coil box 9. Preferably, the straight-line segment positioning block 4 and the arc segment positioning block 5 are both installed on the lower positioning frame 1. Without manually adjusting the position of the upper positioning frame 2, while saving manpower, the straight-line segment positioning block 4 and the arc segment positioning block 5 installed on the lower positioning frame 1 also play a role in positioning the box body 92, facilitating the installation of the box body 92 on the lower positioning surface 11.

[0037] When welding the coil box 9, the relative positions between the upper positioning frame 2 and the lower positioning frame 1 are aligned. To facilitate the alignment of the positions of the upper positioning frame 2 and the lower positioning frame 1, preferably, the lower positioning frame 1 is further provided with a straight-side guiding and positioning member 12 and an arc-side guiding and positioning member 13 for installing and positioning the upper positioning frame 2; when the coil box 9 is installed on the lower positioning surface 11, the straight-side guiding and positioning member 12 is located between the straight-line segment 94 and the lower positioning frame 1, and the arc-side guiding and positioning member 13 is located between the arc segment 95 and the lower positioning frame 1. The straight-side guiding and positioning member 12 and the arc-side guiding and positioning member 13 both have various structural forms. They can be positioning protrusions protruding upward or horizontally, or can be positioning grooves concave downward or horizontally inward. The positioning groove can be formed by combining the positioning protrusion protruding upward with the lower positioning frame 1. Generally, the upper positioning frame 2 has structural members adapted to the straight-side guiding and positioning member 12 and the arc-side guiding and positioning member 13. The structures of the straight-side guiding and positioning member 12 and the arc-side guiding and positioning member 13 can be the same or different. For the convenience of processing and manufacturing, usually, the structures of the straight-side guiding and positioning member 12 and the arc-side guiding and positioning member 13 are the same.

[0038] The relative positions and dimensions of the above-mentioned straight-line segment positioning block 4 and the arc-segment positioning block 5 can be fixed. This requires a certain gap between the two and the inner peripheral surface of the coil box 9 in order to install the box body 92 on the lower positioning frame 1. When welding the coil box 9, the straight-line segment 94 and the arc segment 95 still have a certain amount of deformation. Preferably, it further includes a first horizontal telescopic device 61 and a second horizontal telescopic device 62; one end of the first horizontal telescopic device 61 is connected to the straight-line segment positioning block 4, and the other end of the first horizontal telescopic device 61 is connected to the straight-side guiding and positioning member 12; one end of the second horizontal telescopic device 62 is connected to the arc-segment positioning block 5, and the other end of the second horizontal telescopic device 62 is connected to the arc-side guiding and positioning member 13. Before installing the box body 92, both the first horizontal telescopic device 61 and the second horizontal telescopic device 62 are in a horizontally contracted state, that is, both the straight-line segment positioning block 4 and the arc-segment positioning block 5 are also in a horizontally contracted state; after the box body 92 is placed on the lower positioning surface 11 of the lower positioning frame 1 and leveled and aligned, while the first horizontal telescopic device 61 drives the straight-line segment positioning block 4 to extend, the second horizontal telescopic device 62 drives the arc-segment positioning block 5 to extend until the straight-line segment positioning block 4 tightly supports the inner peripheral surface of the straight-line segment 94, and the arc-segment positioning block 5 tightly supports the inner peripheral surface of the arc segment 95. Compared with the structure of the non-telescopic straight-line segment positioning block 4 and arc-segment positioning block 5, during welding, there is no gap between the inner peripheral surface of the straight-line segment 94 and the straight-line segment positioning block 4, and between the arc segment 95 and the arc-segment positioning block 5, which can further reduce the inward shrinkage deformation of the straight-line segment 94 and the arc segment 95 in the horizontal direction when welding the coil box 9.

[0039] The horizontal telescopic device 6 has various structural forms, such as screw rods, automatic push rods, motor-driven screw rod pair combined structures, etc. Specifically, both the first horizontal telescopic device 61 and the second horizontal telescopic device 62 are adjusting screw rods. Both the straight-line segment positioning block 4 and the arc positioning block 5 are threadedly connected to one end of the adjusting screw rod, and the other end of the adjusting screw rod is threadedly connected to the lower positioning frame 1. By manually rotating the adjusting screw rod, the telescoping of the straight-line segment positioning block 4 and the arc positioning block 5 is realized, and the structure is simple. As a further preference, both the first horizontal telescopic device 61 and the second horizontal telescopic device 62 are automatic push rods, which can realize the automatic telescoping of the straight-line segment positioning block 4 and the arc positioning block 5, saving manpower and improving production efficiency. The automatic push rod has various forms, such as hydraulic push rods, pneumatic push rods, or electric push rods, etc.

[0040] The above is the specific implementation manner of the present invention. It can be seen from the implementation process that the present invention provides a welding positioning tooling for a toroidal field coil case. When welding the coil case, the upper positioning surface abuts against the top surface of the coil case, and the lower positioning surface abuts against the bottom surface of the coil case, ensuring that the gap between the upper positioning surface and the lower positioning surface remains fixed, reducing the welding deformation of the coil case in the up-and-down direction; by providing a straight segment positioning block and an arc segment positioning block, the inner circumferential surfaces of the straight segment and the arc segment of the coil case are supported, reducing the inward shrinkage deformation of the straight segment and the arc segment in the horizontal direction; both the straight segment positioning block and the arc segment positioning block are installed on the lower positioning frame, which not only reduces the inward shrinkage deformation of the welded coil case but also plays a role in positioning the box body; by providing a first isolation plate, a second isolation plate, an upper isolation plate and a lower isolation plate to isolate the stainless steel coil case from the carbon steel positioning tooling, avoiding the coil case from being contaminated by carbon steel and saving the manufacturing cost of the positioning tooling; both the straight segment positioning block and the arc segment positioning block can be telescoped in the horizontal direction, tightly supporting the inner circumferential surface of the coil case, further reducing the inward shrinkage deformation of the straight segment and the arc segment in the horizontal direction during welding.

Claims

1. A circumferential field coil box welding positioning tooling, characterized in that: It includes an upper positioning frame (2) and a lower positioning frame (1) arranged up and down. The lower positioning frame (1) and the upper positioning frame (2) are tightly connected up and down through a connecting piece (3); The lower positioning frame (1) has a lower positioning surface (11), and the upper positioning frame (2) has an upper positioning surface (21); When welding the coil box (9), the lower positioning surface (11) abuts against the bottom surface of the coil box (9), and the upper positioning surface (21) abuts against the top surface of the coil box (9); the distance between the lower positioning surface (11) and the upper positioning surface (21) is equal to the thickness of the coil box (9); It also includes a straight segment positioning block (4) and an arc segment positioning block (5); the straight positioning block (4) is arranged on the lower positioning frame (1) or the upper positioning frame (2) and is used to support the inner peripheral surface of the straight segment (94) of the coil box (9); the arc segment positioning block (5) is arranged on the lower positioning frame (1) or the upper positioning frame (2) and is used to support the inner peripheral surface of the arc segment (95) of the coil box (9).

2. The circumferential field coil box welding positioning tooling according to claim 1, characterized in that: The connecting piece (3) is a vertically arranged fastening bolt.

3. The circumferential field coil box welding positioning tooling according to claim 1, characterized in that: The shape of the straight segment support surface on the straight segment positioning block (4) is adapted to the shape of the inner peripheral surface of the straight segment (94), and the shape of the arc segment support surface on the arc segment positioning block (5) is adapted to the shape of the inner peripheral surface of the arc segment (95).

4. The circumferential field coil box welding positioning tooling according to claim 3, characterized in that: Both the straight segment positioning block (4) and the arc segment positioning block (5) are installed on the lower positioning frame (1).

5. The circumferential field coil box welding positioning tooling according to claim 3, characterized in that: A first isolation plate (71) is provided on one side of the straight segment positioning block (4) close to the inner peripheral surface of the straight segment (94), and a second isolation plate (72) is provided on one side of the arc segment positioning block (5) close to the inner peripheral surface of the arc segment (95); an upper isolation plate is provided on the lower positioning surface (11), and a lower isolation plate is provided on the upper positioning surface (21); The first isolation plate (71), the second isolation plate (72), the upper isolation plate and the lower isolation plate are all made of stainless steel.

6. The circumferential field coil box welding positioning tooling according to any one of claims 1-5, characterized in that: The lower positioning frame (1) is also provided with a straight side guiding and positioning member (12) and an arc side guiding and positioning member (13) for installing and positioning the upper positioning frame (2); When the coil box (9) is installed on the lower positioning surface (11), the straight side guiding and positioning member (12) is located between the straight segment (94) and the lower positioning frame (1), and the arc side guiding and positioning member (13) is located between the arc segment (95) and the lower positioning frame (1).

7. The circumferential field coil box welding positioning tooling according to claim 6, characterized in that: it further includes a first horizontal telescopic device (61) and a second horizontal telescopic device (62); one end of the first horizontal telescopic device (61) is connected to the straight segment positioning block (4), and the other end of the first horizontal telescopic device (61) is connected to the straight side guiding positioning member (12); one end of the second horizontal telescopic device (62) is connected to the arc segment positioning block (5), and the other end of the second horizontal telescopic device (62) is connected to the arc side guiding positioning member (13).

8. The circumferential field coil box welding positioning tooling according to claim 7, characterized in that: both the first horizontal telescopic device (61) and the second horizontal telescopic device (62) are adjusting screws.

9. The circumferential field coil box welding positioning tooling according to claim 7, characterized in that: both the first horizontal telescopic device (61) and the second horizontal telescopic device (62) are automatic push rods.

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