D-shaped profile superconducting coil mounting tool and method

Abstract

The application discloses a D-shaped profile superconducting coil mounting tool and method, and relates to the field of nuclear fusion superconducting coil manufacturing.The tool comprises the following steps: installing and fixing a separately adjustable lifting platform; leveling the lifting platform by using a laser tracker; installing a high-field coil inner profile limiting tool; installing a high-field coil lifting tool; lifting the high-field coil to the lifting platform; positioning and lowering along the inner profile limiting tool and a profile line; lowering the adjustable lifting platform at intervals, taking out the lifting tool, and restoring the original height; installing a middle-field coil outer profile limiting tool; installing a single conductor lifting tool; installing a gap filling plate and a middle-field coil lifting tool; lifting the middle-field coil through the single conductor and lowering it on the lifting platform; measuring the installation gap between the two coils, and completing the coil assembly.The tool comprises the following: an adjustable lifting platform, a lifting tool, an inner profile limiting tool, an outer profile limiting tool, a single conductor lifting tool, and a gap filling plate.The application improves the installation precision, and ensures the safety and stability of the superconducting coil during lifting.

Description

Technical Field

[0001] This invention relates to the field of manufacturing superconducting coils for nuclear fusion, and specifically to a D-shaped profile superconducting coil mounting fixture and method. Background Technology

[0002] The toroidal field superconducting coil is a key component of a nuclear fusion reactor. It has a "D"-shaped profile and consists of high-field and mid-field coils. The mid-field coil uses International Thermonuclear Experimental Reactor (ITER) grade Nb3Sn conductor and is composed of four independent coils stacked after VPI (vacuum pressure impregnation). The high-field coil uses high-performance Nb3Sn conductor and undergoes VPI after heat treatment and inter-turn insulation wrapping. After the sub-coils are VPI'd, the high-field and mid-field coils are installed in that order. If the single conductor portion of the high-field coil extends beyond the outer coil after installation, the mid-field coil cannot be installed. According to installation requirements, the installation gap for the straight sections of the coil is 10mm, for the curved sections it is 30mm, and for the helium tube location it is 120mm. The coil installation position accuracy requirement is 3mm. The conventional method of assembly is slow and the accuracy of assembly cannot be controlled in one go. In particular, during installation, it is necessary to raise the single conductor of the coil. If the coil is halfway installed and there is a positional deviation, the installation cannot be completed. The position of the coil needs to be manually adjusted, which is inefficient and prone to safety hazards. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a D-shaped profile superconducting coil installation fixture and method, which improves installation accuracy, ensures the safety and stability of the superconducting coil during hoisting, and reduces manual operation to avoid safety hazards.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A D-shaped profile superconducting coil installation fixture includes an adjustable lifting platform, a lifting device, an inner profile limiting device, an outer profile limiting device, a single conductor lifting device, and a gap filling plate. Multiple adjustable lifting platforms are used to support the high-field coil and the mid-field coil, and the height is adjusted by intermittently raising and lowering multiple adjustable lifting platforms to remove the lifting device. The upper end of the lifting device is connected to a hanger, and the lower end of the lifting device is fitted onto the high-field coil or the mid-field coil. The inner profile limiting device is fixed to the adjustable lifting platform and is used to limit the inner profile of the high-field coil during its descent. The outer profile limiting device is fixed to the outside of the adjustable lifting platform and is used to adjust the installation gap between the outer profile of the mid-field coil and the high-field coil. The single conductor lifting device is installed on the adjustable lifting platform inside the high-field coil and is used to lift the single conductor of the high-field coil. The gap filling plate is circumferentially disposed in the installation gap between the high-field coil and the mid-field coil.

[0006] This invention also provides an installation method using the aforementioned D-shaped profile superconducting coil mounting fixture, comprising the following steps: fixing and leveling multiple adjustable lifting platforms on the ground; installing an inner profile limiting fixture for the high-field coil on the adjustable lifting platforms; installing a lifting device for the high-field coil and hoisting the high-field coil above the adjustable lifting platforms, positioning it along the inner profile limiting fixture and lowering it onto the platform surface of the adjustable lifting platforms; intermittently lowering multiple adjustable lifting platforms to remove the lifting device, and then restoring the original height of the lowered multiple adjustable lifting platforms; installing an outer profile limiting fixture and a single conductor lifting fixture for the field coil on the adjustable lifting platforms, and using the single conductor lifting fixture to peel the single conductor of the high-field coil from the high-field coil; installing a gap filling plate in the installation gap between the high-field coil and the field coil and assembling a lifting device for the field coil; hoisting the field coil through the single conductor of the high-field coil, adjusting its position using the outer profile limiting fixture, and then lowering it onto the adjustable lifting platforms; measuring the installation gap between the field coil and the high-field coil to complete the assembly.

[0007] Beneficial effects:

[0008] 1. This invention uses an inner contour limiting fixture to precisely guide the high-field coil during its descent. Combined with an adjustable lifting platform leveled by a laser tracker, the coil's position is controlled within 3mm. The outer contour limiting fixture can adjust the radial position of the field coil in real time. Combined with a gap filling plate, it precisely controls the installation gaps of 10mm for the straight section, 30mm for the arc section, and 120mm for the helium tube position. This solves the problems of uncontrollable precision and the need for repeated manual adjustments in traditional methods, achieving precise positioning in one step.

[0009] 2. The present invention uses a single conductor lifting fixture to raise the protruding part of the high field coil to a height of 1.5 meters above the platform, providing sufficient space for the hoisting of the mid field coil, so that the mid field coil can pass smoothly through the single conductor area to complete the assembly, completely avoiding the risk of installation interruption or even failure due to single conductor obstruction.

[0010] 3. This invention utilizes the interval lifting function of the adjustable lifting platform to quickly dismantle the lifting device without lowering the entire coil; the outer contour limiting fixture, in conjunction with the overhead crane, enables pre-adjustment of the position of the mid-field coil at a height of 100mm. Compared with the traditional manual adjustment method, the installation cycle is significantly shortened and efficiency is significantly improved.

[0011] 4. This invention achieves mechanical limiting and stable support for the coil, avoiding direct manual contact with the coil during hoisting; the method of interval lifting and dismantling the lifting equipment eliminates the risks of working at height; protective measures such as silicone rubber sheets and epoxy mats prevent damage to the coil insulation layer, systematically solving the prominent safety hazards of traditional methods.

[0012] 5. The gap filling plate of this invention, which is integrally processed from G10 material, ensures uniform and consistent gaps. The modular design of each tooling is reusable, making the installation process standardized and streamlined, with high quality stability. It is particularly suitable for engineering applications in mass production of coils. Attached Figure Description

[0013] Figure 1 This is a flowchart of a D-shaped profile superconducting coil installation method according to the present invention;

[0014] Figure 2 This is a schematic diagram of the installation process of the high-field superconducting coil of the present invention;

[0015] Figure 3 This is a schematic diagram of the high-field superconducting coil of the present invention;

[0016] Figure 4 This is a schematic diagram of the lifting device of the present invention;

[0017] Figure 5 This is a schematic diagram of the adjustable lifting platform of the present invention;

[0018] Figure 6 This is a schematic diagram of the inner contour limiting tooling of the present invention;

[0019] Figure 7 This is a schematic diagram of the outer contour limiting tooling of the present invention;

[0020] Figure 8 This is a schematic diagram of the single-conductor lifting fixture of the present invention.

[0021] The attached diagrams are labeled as follows: 1. Lifting device; 11. Lifting rope; 12. Lock; 13. Upper clamping plate; 14. Upper epoxy board; 15. Lower epoxy board; 16. U-shaped plate; 2. Adjustable lifting platform; 21. Base plate; 22. Support frame; 23. Screw jack; 24. Connecting rod; 25. Coupling; 26. Reversing mechanism; 27. Reducer; 28. Motor; 29. ​​Flange; 210. Upper support plate; 3. Inner contour limiting fixture; 31. 32. Backplate support; 33. Bolt adjusting plate; 4. Silicone rubber plate; 5. Outer contour limiting fixture; 6. Fixed support platform; 7. Adjustable roller frame; 8. Roller; 9. Epoxy pad; 10. Single conductor lifting fixture; 11. Lifting support platform; 12. Guide rod; 13. Guide sleeve; 14. Conductor support rod; 15. Optical axis; 16. Screw jack; 17. Handwheel; 18. Gap filling plate; 19. High field coil; 20. Mid field coil. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other. Preferred embodiments of this invention will now be described in detail with reference to the accompanying drawings.

[0023] like Figure 2 As shown, a D-shaped profile superconducting coil installation fixture of the present invention includes a lifting device 1, an adjustable lifting platform 2, an inner profile limiting fixture 3, an outer profile limiting fixture 4, a single conductor lifting fixture 5, a gap filling plate 6, a high-field coil 7, and a mid-field coil 8. The adjustable lifting platform 2 is welded from profiles and plates and bears the weight of the high-field coil 7 and the mid-field coil 8. After the high-field coil 7 is lowered onto the adjustable lifting platform 2, the lifting device 1 can be removed by intermittently raising and lowering the height of the adjustable lifting platform 2.

[0024] The upper end of the lifting device 1 is connected to the lifting frame, and the lower end is fitted onto the superconducting coil. The inner contour limiting fixture 3 is fixed on the adjustable lifting platform 2. Fourteen sets of inner contour limiting fixtures 3 are installed upward on the inner ring of the adjustable lifting platform 2, which can control the position of the high-field coil 7 during descent. The outer contour limiting fixture 4 is fixed on the outside of the adjustable lifting platform 2 to adjust the installation gap between the outer contour of the field coil 8 and the high-field coil 7. The single conductor lifting fixture 5 adjusts the height of the single conductor by a hand-cranked handwheel 57. The gap filling plate 6 is made of G10 material, integrally processed, and formed in one piece to simulate the coil installation gap.

[0025] like Figure 5 , Figure 6 , Figure 7 As shown, the adjustable lifting platform 2 serves as the basic support platform, fixed to the ground by bolts. Its support plate 210 bears the entire weight of the high-field coil 7 and the mid-field coil 8. The back plate support 31 of the inner contour limiting fixture 3 is fixed to the inner side of the adjustable lifting platform 2 by bolts. The silicone rubber plate 33 of the inner contour limiting fixture 3 contacts the inner contour of the high-field coil 7 to guide its descent. The fixed support platform 41 of the outer contour limiting fixture 4 is installed on the outer side of the adjustable lifting platform 2, and the outer contour of the mid-field coil 8 is guided by the adjustable roller frame 42 and rollers 43. Radial position adjustment; the lifting support platform 51 of the single conductor lifting fixture 5 is fixed to the outer ring of the adjustable lifting platform 2, and its conductor support rod 54 is driven by the screw jack 56 to lift the protruding single conductor of the high field coil 7; the upper end of the lifting device 1 is connected to the workshop hanger through the shaft pin, and the lower end is sleeved on the coil and contacts the coil end face through the epoxy board to realize the lifting of the high field coil 7 and the medium field coil 8; the gap filling plate 6 is inserted circumferentially between the high field coil 7 and the medium field coil 8 to maintain a precise installation gap, so as to ensure the assembly of the D-shaped profile superconducting coil.

[0026] like Figure 3 As shown, the high-field coil 7 and the medium-field coil 8 have a D-shaped outline, with the high-field coil 7 located inside the medium-field coil 8. During installation, a single-conductor lifting fixture 5 is used to lift the single conductor, and the single-conductor lifting fixture 5 is installed inside the high-field coil 7.

[0027] like Figure 4 As shown, the lifting device 1 includes a lifting rope 11, a buckle 12, an upper clamping plate 13, an upper epoxy plate 14, a lower epoxy plate 15, and a U-shaped plate 16. The buckle 12 passes through the hole in the lifting rope 11 for connection. The buckle 12 is fixed to the holes on both sides of the upper clamping plate 13 and the U-shaped plate 16 by bolts. The upper clamping plate 13 has two holes and is connected to the U-shaped plate 16 to form a whole. The upper epoxy plate 14 contacts the upper end face of the superconducting coil to protect the upper insulation layer of the superconducting coil from damage. The lower epoxy plate 15 contacts the lower end face of the superconducting coil to protect the lower insulation layer of the superconducting coil from damage. The U-shaped plate 16 is processed by sheet metal bending and has two holes on both sides of its upper end.

[0028] like Figure 5 As shown, the adjustable lifting platform 2 includes a base plate 21, a support frame 22, a screw jack 23, a connecting rod 24, a coupling 25, a reversing mechanism 26, a reducer 27, a motor 28, a flange 29, and an upper support plate 210. The base plate 21 is fixed to the ground with bolts. The lower end of the support frame 22 is fixed to the base plate 21. The screw jack 23 is mounted on the support frame 22 and fixed with bolts. One end of the connecting rod 24 is connected to the screw jack 23 via a coupling 25, and the other end is connected to the reversing mechanism 26. The reversing mechanism 26 is located between the two connecting rods 24. The coupling 25 is a rigid coupling with an openable hole at each end. One end is fixed to the connecting rod 24 with a locking screw. The reversing mechanism 26 achieves a 90° reversing function. The reducer 27 is connected to the reversing mechanism 26 via a bushing. The motor 28 is connected to the reducer 27. Starting the motor 28 enables the upper support plate 210 to move up and down. One end of the flange 29 is connected to the screw jack 23, and the other end is connected to the upper support plate 210. Preferably, there are four support frames 22, which together form a three-dimensional frame structure. A screw jack 23 is installed above each of the four support frames 22. The four screw jacks 23 are divided into two groups, and each group is connected to the connecting rod 24 and the reversing machine 26.

[0029] like Figure 6As shown, the inner contour limiting fixture 3 includes a back plate support 31, a bolt adjusting plate 32, and a silicone rubber plate 33. The back plate support 31 is manufactured by welding, with two rows of threaded holes machined on both sides. The lower end is fixed to the adjustable lifting platform 2 inside the coil by bolts. The bolt adjusting plate 32 can be connected to the back plate support 31 by bolts, and the bolt adjusting plate 32 can be leveled by bolts. One side of the silicone rubber plate 33 is fixed to the bolt adjusting plate 32, and the other side contacts the inner contour of the high-field coil 7.

[0030] like Figure 7 As shown, the outer contour limiting fixture 4 includes a fixed support platform 41, an adjustable roller frame 42, rollers 43, and an epoxy pad 44. The lower end of the fixed support platform 41 is fixed to the adjustable lifting platform 2, and the upper end has a threaded hole. One end of the adjustable roller frame 42 is connected to the fixed support platform 41, and the other end is equipped with rollers 43. The radial position of the rollers 43 can be changed by adjusting the adjustable roller frame 42, thereby adjusting the outer contour of the field coil 8. The rollers 43 are fixed on the adjustable roller frame 42 in a row of two. The epoxy pad 44 contacts the field coil 8 and the rollers 43 to prevent the rollers from scratching the field coil 8.

[0031] like Figure 8 As shown, the single conductor lifting fixture 5 includes a lifting support platform 51, a guide rod 52, a guide sleeve 53, a conductor support rod 54, an optical axis 55, a screw jack 56, and a handwheel 57. The lifting support platform 51 is welded from sheet metal, with its lower end fixed to the outer ring of the adjustable lifting platform 2. The guide rod 52 is inserted into the guide sleeve 53, and its upper end is connected to the conductor support rod 54. The guide sleeve 53 is made of phosphor bronze and is fixed to the lifting support platform 51. The front end of the conductor support rod 54 lifts the single conductor, and the hole at its rear end connects to the screw jack 56 via the optical axis 55. The optical axis 55 is connected to the end of the screw jack 56, which is fixed to the lifting support platform 51. The handwheel 57 is connected to the screw jack 56, and the conductor support rod 54 can be lifted by hand-cranking the handwheel 57.

[0032] like Figure 1 As shown ( Figure 1 (The lifting platform mentioned in this invention refers to the adjustable lifting platform of this invention). This invention also provides a method for installing a D-shaped profile superconducting coil, which specifically includes the following steps:

[0033] S1: Install and fix the individual adjustable lifting platform:

[0034] Twenty-three individual adjustable lifting platforms are fixed to the ground with bolts, and the height of each adjustable lifting platform can be adjusted by a motor;

[0035] S2: Adjustable lifting platform 2 leveled using a laser tracker:

[0036] Using the height of the adjustable lifting platform on the straight section as a reference, the other adjustable lifting platforms are adjusted to be level and kept at the same height in sequence by laser tracking device;

[0037] S3: Inner contour limiting fixture for installing high-field coils:

[0038] Install inner contour limiting fixtures 3 at different contour radii of the high field coil and fix them to the table surface of the adjustable lifting platform with bolts.

[0039] S4: Lifting device for installing high-field coils:

[0040] Using the center of the twenty-three adjustable lifting platforms as a reference, install twenty-three sets of lifting devices, with the upper end of each set of lifting devices connected to the hanger via a pivot pin;

[0041] S5: Hoist the high-field coil to the platform of the adjustable lifting platform;

[0042] S6: Position and lower the high-field coil along the inner contour limiting fixture and contour line:

[0043] Slowly lower the high-field coil along the inner contour limiting fixture. When the high-field coil is about to contact the surface of the adjustable lifting platform, compare it with the inner contour line on the platform and lower the high-field coil.

[0044] S7: Intermittently lower individual lifting platforms, remove the lifting equipment, and restore the original height: Start the motor, synchronously lower eleven adjustable lifting platforms at intervals, remove the lifting equipment, then synchronously raise eleven adjustable lifting platforms to restore the original height, continue to synchronously lower twelve adjustable lifting platforms at intervals, remove the remaining twelve lifting equipment, and then restore the height of the remaining twelve adjustable lifting platforms.

[0045] S8: Fixture 4 for installing the outer contour limit of the mid-field coil:

[0046] The bottom of the outer contour limiting fixture is fixed on the adjustable lifting platform, and the adjustable roller frame is adjusted to control the contact between the roller and the outer contour of the superconducting coil.

[0047] S9: Install single conductor lifting fixture 5:

[0048] Install the single conductor lifting fixture on the adjustable lifting platform, fix the single conductor of the high field coil on the conductor support rod, and crank the handwheel of the screw jack to adjust the height of the screw. The single conductor can be stripped from the high field coil until it stops 1.5 meters away from the adjustable lifting platform.

[0049] S10: Lifting device for installing gap filler plate and mid-field coil:

[0050] A gap filler plate 6 is installed circumferentially in the installation gap between the high field coil and the mid field coil to ensure the gap size. The hanger of the mid field coil is installed and connected to the hanger by a shaft pin.

[0051] S11: Hoist the mid-field coil through the single conductor and lower it onto the adjustable lifting platform: Hoist the mid-field coil above the single conductor, slowly lower the mid-field coil, and when the mid-field coil is about 100mm away from the high-field coil, move the crane and use the outer contour limit fixture to adjust the position of the mid-field coil until the installation gap between the mid-field coil and the high-field coil is more than 3mm, and then lower the mid-field coil onto the adjustable lifting platform.

[0052] S12: Measurement of the high-field coil and the mid-field coil (i.e.) Figure 1 The two coils in the middle are installed with a gap to complete the coil assembly.

[0053] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A D-shaped profile superconducting coil mounting fixture, characterized in that, The system includes an adjustable lifting platform, a lifting device, an inner contour limiting fixture, an outer contour limiting fixture, a single conductor lifting fixture, and a gap filling plate. Multiple adjustable lifting platforms are used to support the high-field coil and the mid-field coil, and the height is adjusted by intermittently raising and lowering these platforms to remove the lifting device. The upper end of the lifting device is connected to the lifting frame, and the lower end is fitted onto the high-field coil or the mid-field coil. The inner contour limiting fixture is fixed to the adjustable lifting platform to limit the inner contour of the high-field coil during its descent. The outer contour limiting fixture is fixed to the outside of the adjustable lifting platform to adjust the installation gap between the outer contour of the mid-field coil and the high-field coil. The single conductor lifting fixture is installed on the adjustable lifting platform inside the high-field coil to lift the single conductor of the high-field coil. The gap filling plate is circumferentially positioned in the installation gap between the high-field coil and the mid-field coil.

2. The D-shaped profile superconducting coil mounting fixture according to claim 1, characterized in that, The adjustable lifting platform includes a base plate, a support frame, a screw jack, a connecting rod, a coupling, a reversing mechanism, a reducer, a motor, and an upper support plate. The base plate is fixed to the ground, and the lower end of the support frame is connected to the base plate. The screw jack is installed on the support frame and fixed with bolts. One end of the connecting rod is connected to the screw jack via a coupling, and the other end is connected to the reversing mechanism. The reversing mechanism is connected to the reducer, and the reducer is connected to the motor. The screw jack is connected to the upper support plate via a flange, and the motor drives the upper support plate to move up and down.

3. The D-shaped profile superconducting coil mounting fixture according to claim 1, characterized in that, The lifting device includes a lifting rope, a locking buckle, an upper clamping plate, an upper epoxy plate, a lower epoxy plate, and a U-shaped plate; the lifting rope is connected by the locking buckle, and the locking buckle is fixed to the holes on both sides of the upper clamping plate and the U-shaped plate by bolts; the upper clamping plate and the U-shaped plate are connected as a whole, the upper epoxy plate is in contact with the upper end face of the high field coil or the mid field coil, and the lower epoxy plate is in contact with the lower end face of the high field coil or the mid field coil.

4. The D-shaped profile superconducting coil mounting fixture according to claim 1, characterized in that, The inner contour limiting fixture includes a back plate support, a bolt adjustment plate, and a silicone rubber plate; the lower end of the back plate support is fixed to an adjustable lifting platform, and threaded holes are provided on both sides; the bolt adjustment plate is connected to the back plate support by bolts and can be adjusted to be level; one side of the silicone rubber plate is fixed to the bolt adjustment plate, and the other side is in contact with the inner contour of the high field coil.

5. The D-shaped profile superconducting coil mounting fixture according to claim 1, characterized in that, The outer contour limiting fixture includes a fixed support platform, an adjustable roller frame, rollers, and an epoxy pad; the lower end of the fixed support platform is fixed to the adjustable lifting platform, and the upper end is provided with a threaded hole; one end of the adjustable roller frame is connected to the fixed support platform, and the other end is equipped with rollers; the epoxy pad is located between the rollers and the field coil.

6. The D-shaped profile superconducting coil mounting fixture according to claim 1, characterized in that, The single conductor lifting fixture includes a lifting support platform, a guide rod, a guide sleeve, a conductor support rod, an optical axis, a screw jack, and a handwheel; the lower end of the lifting support platform is fixed to the outer ring of the adjustable lifting platform; the guide rod is inserted into the guide sleeve and connected to the conductor support rod; the guide sleeve is fixed to the lifting support platform; the rear end of the conductor support rod is connected to the screw jack through the optical axis; the screw jack is fixed to the lifting support platform, and the handwheel is connected to the screw jack.

7. The D-shaped profile superconducting coil mounting fixture according to claim 1, characterized in that, The gap filling plate is integrally formed from G10 material and is arranged circumferentially in the installation gap between the high-field coil and the mid-field coil.

8. A method for installing a D-shaped profile superconducting coil mounting fixture according to any one of claims 1-7, characterized in that, include: Fix multiple adjustable lifting platforms to the ground and level them; install the inner contour limiting fixture of the high field coil on the adjustable lifting platform; install the lifting device of the high field coil and lift the high field coil to the top of the adjustable lifting platform, position it along the inner contour limiting fixture and lower it to the platform of the adjustable lifting platform; lower multiple adjustable lifting platforms at intervals to remove the lifting device, and then restore the original height of the lowered multiple adjustable lifting platforms. Install the outer contour limiting fixture and single conductor lifting fixture of the mid-field coil on the adjustable lifting platform. Use the single conductor lifting fixture to peel the single conductor of the high-field coil from the high-field coil. Install a gap filling plate in the installation gap between the high-field coil and the mid-field coil and assemble the lifting device of the mid-field coil. Hoist the mid-field coil through the single conductor of the high-field coil, adjust its position using the outer contour limiting fixture, and then lower it onto the adjustable lifting platform. Measure the installation gap between the mid-field coil and the high-field coil to complete the assembly.

9. The installation method according to claim 8, characterized in that, During the hoisting of the mid-field coil, when the mid-field coil is 100mm away from the high-field coil, the position of the mid-field coil is adjusted by moving the gantry crane and cooperating with the outer contour limiting fixture. The coil is then lowered after the installation gap between the mid-field coil and the high-field coil is more than 3mm.

10. The installation method according to claim 8, characterized in that, Before installing the field coil, the single conductor lifting fixture uses a hand-cranked screw jack to adjust the conductor support rod to a height of 1.5 meters from the adjustable lifting platform and fix the single conductor of the high field coil.

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