A kind of skeleton-free superconducting magnet coil preparation device and process method

Abstract

This invention discloses a frameless superconducting magnet coil fabrication apparatus and process, belonging to the field of power industry technology. The apparatus includes a splicing frame and a supporting fixture. The splicing frame is positioned outside and surrounds the supporting fixture. After the frameless superconducting magnet coil is fabricated, the splicing frame and the supporting fixture are separated. The splicing frame includes a frame cylinder, which is mechanically divided into three parts with beveled cuts for disassembly. The three parts are assembled into a single cylinder to provide radial support for the winding of the superconducting magnet coil. The supporting fixture includes a winding fixture shaft, multiple support plates, and multiple support rods. One end of each support rod is fixed to the winding fixture shaft, and the other end is connected to a support plate. The support plates expand outward to support the frame cylinder. This invention, through the mechanical structure design of a split cylinder, achieves low-cost fabrication of frameless superconducting coils at room temperature. The process is simple, greatly reducing cost, process complexity, and operational difficulty.

Description

Technical Field

[0001] This invention belongs to the field of electric power industry technology, specifically relating to a frameless superconducting magnet coil preparation device and process. Background Technology

[0002] Traditional superconducting magnet coils typically have superconducting wire wound on a metal frame (such as a stainless steel or aluminum alloy cylinder). Due to the difference in thermal shrinkage rates between the coil and the metal frame, the superconducting magnet coil is prone to relative displacement and friction during cooling and excitation. This can not only induce quenching and prolong the excitation cycle, but also lead to a decrease in magnetic field uniformity. At the same time, the mass of the frame itself accounts for 30%-50% of the total weight of the magnet. This huge mass increases material costs and manufacturing complexity, while also posing significant difficulties for transportation and installation.

[0003] The manufacturing technology of frameless superconducting magnet coils can solve many of the problems mentioned above associated with traditional frames. However, existing methods for manufacturing frameless superconducting magnet coils are complex and costly. Current technologies use cryogenic shrinkage to remove the magnet frame, which is complex and difficult to operate, requiring the use of liquid nitrogen, further increasing manufacturing costs. Furthermore, operating in a low-temperature environment poses certain risks, potentially leading to frostbite. Therefore, how to achieve low-cost, simple manufacturing of lightweight, highly stable frameless superconducting magnet coils is a pressing problem that needs to be solved. Summary of the Invention

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A frameless superconducting magnet coil fabrication apparatus includes: a splicing frame and a supporting fixture, wherein the splicing frame is disposed outside and surrounds the supporting fixture; after the frameless superconducting magnet coil is fabricated, the splicing frame and the supporting fixture are separated; the splicing frame includes a frame cylinder, which is divided into three parts by mechanical processing, with beveled cuts for disassembly of the frame cylinder, and the three parts are assembled into a whole cylinder to provide radial support for the winding of the superconducting magnet coil; the supporting fixture includes a winding fixture shaft and multiple support plates and multiple support rods; one end of each support rod is fixed to the winding fixture shaft, and the other end is connected to a support plate, which expands outward to support the frame cylinder.

[0006] The present invention has the following beneficial effects:

[0007] This invention achieves low-cost fabrication of frameless superconducting coils at room temperature through a mechanical structure design such as a split cylindrical body. The process is simple and easy to operate, solving the problems of high cost and complex processes associated with removing the magnet frame using liquid helium or liquid nitrogen through thermal expansion and contraction. Furthermore, the use of low-temperature environments is costly, difficult to operate, and carries certain risks (freezing injury). The process of this invention operates at room temperature, eliminating the need for liquid helium or liquid nitrogen, significantly reducing costs, process complexity, and operational difficulty, while also eliminating the risk of freezing injury. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the overall structure of the frameless superconducting magnet coil fabrication device of the present invention, wherein 1-frame cylinder, 2-frame end plate, 3-coil spacer plate, 4-spacer plate connecting piece, 5-coil outer end plate, 6-epoxy block; 13-limiting ring;

[0009] Figure 2 The separable splicing skeleton of the present invention includes, wherein, 1-a-the first part of the skeleton cylinder, 1-b-the second part of the skeleton cylinder, and 1-c-the third part of the skeleton cylinder;

[0010] Figure 3 This is a schematic diagram of the support fixture in the present invention, wherein 7-winding fixture shaft, 8-flange nut, 9-flange on nut, 10-fixed flange, 11-support plate, 12-support rod;

[0011] Figure 4 This is a schematic diagram of the assembly of the supporting tooling and the splicing frame in this invention. Detailed Implementation

[0012] 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.

[0013] The purpose of this invention is to solve the problems of complex and high cost in the existing frameless superconducting magnet coil manufacturing process, while improving the manufacturing precision and performance of superconducting magnet coils. Based on this, this invention proposes a frameless superconducting magnet coil manufacturing apparatus and process method, which can remove the magnet frame by mechanical means at room temperature.

[0014] The frameless superconducting magnet coil fabrication device proposed in this invention includes a splicing frame and a supporting fixture. The splicing frame is positioned outside and surrounds the supporting fixture. After the frameless superconducting magnet coil is fabricated, the splicing frame and the supporting fixture are separated. The splicing frame includes a frame cylinder, which is divided into three parts by mechanical processing with beveled cuts for disassembly. The three parts are assembled into a single cylinder to provide radial support for the winding of the superconducting magnet coil. The supporting fixture includes a winding fixture shaft, multiple support plates, and multiple support rods. One end of each support rod is fixed to the winding fixture shaft, and the other end is connected to a support plate. The support plate expands outward to support the frame cylinder.

[0015] like Figure 1 As shown, the splicing frame includes a frame cylinder 1, two frame end plates 2, and multiple ( Figure 1 Taking three coil spacers 3 as an example (one of which is not shown), the coil spacers 3, spacer connecting pieces 4, and two outer coil end plates 5 are also included. The skeleton cylinder 1 is positioned between the two skeleton end plates 2 and inserted into the slots inside the two skeleton end plates 2. The two skeleton end plates 2 are respectively positioned at both ends of the skeleton cylinder 1. The coil spacers 3 are fixed by bolts through the spacer connecting pieces 4 and embedded in the radial grooves of the skeleton cylinder 1. Each of the two outer coil end plates 5 is tightly attached to one skeleton end plate 2 and fitted onto the skeleton cylinder 1. Epoxy blocks 6 are embedded between the two coil spacers 3. Two limiting rings 13 are respectively bolted to fix the skeleton end plates 2 and the winding tool shaft 7 supporting the tooling.

[0016] like Figure 3 As shown, the support fixture includes a winding fixture shaft 7, a flange nut 8, a flange on the nut 9, multiple fixed flanges 10, multiple support plates 11, and multiple support rods 12. Each fixed flange 10 is axially welded to the winding fixture shaft 7. The flange nut 8 is threaded onto the winding fixture shaft 7, and the flange on the nut 9 is clearance-fitted onto the flange nut 8. One end of each support rod 12 is connected to the bolt holes of the fixed flanges 10 and the flange on the nut 9 via bolts, and the other end is connected to the bolt holes on the support plates 11 via bolts.

[0017] The fabrication process of the frameless superconducting magnet coil of the present invention includes: First, tightening the supporting fixture inside the assembled splicing frame, spraying a release agent or applying PTFE stickers to the outer surface of the frame cylinder 1 and the inner surface of the frame end plate 2 to prevent epoxy resin from sticking. The superconducting magnet coil is then fabricated on the splicing frame using a dry-winding method. After winding, it undergoes vacuum pressure impregnation, completely filling the gaps in the superconducting magnet coil with epoxy resin as the impregnating agent. The adhesive force of the cured epoxy resin makes the superconducting magnet coil a whole. Finally, the supporting fixture inside the splicing frame is removed, and the splicing frame is disassembled to obtain a lightweight, high-precision frameless superconducting magnet coil.

[0018] The frameless superconducting magnet coil preparation device of the present invention can also be used to prepare frameless superconducting magnet coils by wet winding: epoxy resin is brushed on the spliced ​​frame while the superconducting magnet coil is being wound, and the epoxy resin is cured as the superconducting magnet coil is wound. Finally, the internal support fixture is removed and the spliced ​​frame is removed to obtain a lightweight and high-precision frameless superconducting magnet coil.

[0019] The device of this invention can be repeatedly recycled and used for mass production of frameless superconducting magnet coils. For example... Figure 1 , Figure 2 As shown, in the splicing frame of the frameless superconducting magnet coil manufacturing device of the present invention, the frame cylinder 1 is a split cylinder, which is divided into three parts by mechanical processing: the first part 1-a, the second part 1-b, and the third part 1-c of the frame cylinder 1. The cuts are beveled for disassembling the frame cylinder 1. The three parts can be assembled into a whole cylinder to provide radial support for the winding of the superconducting magnet coil. The frame cylinder 1 is machined with plate grooves for the assembly and connection of the coil spacer plate 3. The relative position of the plate grooves determines the axial dimensional accuracy of the coil.

[0020] The inner side of the frame end plate 2 is machined with an annular groove for assembly and connection with the frame cylinder 1, restricting the radial and axial movement of the frame cylinder 1; the frame end plate 2 is machined with bolt holes for screws ( Figure 1 , Figure 2 (Not shown in the drawing) The bolt holes passing through the two skeleton end plates 2 are used to lock the two skeleton end plates, restricting the axial movement of the skeleton end plates 2.

[0021] The coil spacer 3 is composed of two semi-circular rings spliced ​​together. The two semi-circular rings are set in the plate groove of the skeleton cylinder 1 and are connected and fixed by the spacer plate connecting piece 4. The coil spacer 3 is used to separate different superconducting magnet coils and at the same time, it provides lateral support for the winding of the superconducting magnet coils. The coil spacer 3 has circular holes processed on it. During vacuum pressure impregnation, the circular holes are filled and cured with epoxy resin. The two superconducting magnet coils are connected by curing the epoxy resin at the circular holes. This setting improves the overall mechanical strength of the frameless superconducting magnet coil and can prevent the epoxy resin from breaking due to weak adhesion between the epoxy resin and the coil spacer 3.

[0022] The outer end plate 5 of the coil, which is in the shape of a ring, is set inside the frame end plate 2 and fits on the frame cylinder 1. The inner ring surface of the coil is machined with inlet and outlet grooves for the inlet and outlet of the superconducting magnet coil. At the same time, blind holes are machined on the inner ring surface. The blind holes are filled and cured with epoxy resin during vacuum pressure impregnation and are connected with the epoxy resin in the gap of the superconducting magnet coil. This can enhance the connection strength between the superconducting magnet coil and the outer end plate 5 of the coil. The outer end plate 5 of the coil is used to provide support and protection for both sides of the frameless superconducting magnet coil and prevent the superconducting wire from being exposed and damaged during assembly.

[0023] Epoxy block 6 is used during the winding of superconducting magnet coils. For example, when winding the first superconducting magnet coil on the left, the remaining slots of the superconducting magnet coils that are not wound with superconducting magnet coils are filled with epoxy block 6 to provide axial support for the winding of the superconducting magnet coils, prevent the axial movement of the winding of the superconducting magnet coils, and prevent excessive force generated during winding from squeezing and deforming the coil spacer plate 3. When the first superconducting magnet coil is wound and the second superconducting magnet coil is started, the epoxy block 6 in the slot of the second superconducting magnet coil is removed and the winding begins. All superconducting magnet coils are wound in sequence (at this time, all epoxy blocks 6 are removed).

[0024] The limiting ring 13 has bolt holes machined in the axial and radial directions. It is connected to the skeleton end plate 2 and the winding tool shaft 7 by bolts to limit the relative rotation and axial movement of the splicing skeleton and the winding tool shaft 7.

[0025] like Figure 3 As shown, the support fixture includes a winding fixture shaft 7, a flange nut 8, a flange on the nut 9, multiple fixed flanges 10, multiple support plates 11, and multiple support rods 12.

[0026] Multiple fixed flanges 10 are welded to the outer surface of the winding tool shaft 7, and the support rod 12 is connected to the fixed flanges 10 and the support plate 11 by bolts.

[0027] The upper part of the winding fixture shaft 7 is machined with external threads, which form a threaded fit with the internal threads at the inner diameter of the flange nut 8. The inner diameter of the flange 9 on the nut and the outer diameter of the flange nut 8 are in clearance fit. Tightening the flange nut 8 causes it to move axially, which in turn drives the flange 9 on the nut, which is in clearance fit with the flange nut 8, to move axially. This, in turn, causes the support plate 11 to move radially. Tightening the flange nut 8 causes it to expand outward, and loosening it causes it to contract inward. Multiple support plates 11 (3-6 can be set) are arranged at different radial positions along the winding fixture shaft 7. Figure 2 Taking the setting of 6 support plates 11 as an example, each support plate 11 is fixed by multiple support rods 12 at different positions along the axial direction of the winding tooling shaft 7 and their corresponding fixing flanges 10.

[0028] Each support plate 11 has a curved outer surface that fits snugly against the inner circular surface of the splicing frame during assembly. The assembly diagram of the splicing frame and the support structure is shown below. Figure 4 As shown. After tightening the flange nut 8, the support plate 11 of the support fixture expands outward to support the skeleton cylinder 1, thereby achieving internal support.

[0029] This invention further provides a method for fabricating a frameless superconducting magnet coil, comprising:

[0030] Step 1: Complete the assembly of the frameless superconducting magnet coil preparation device. Spray a release agent or PTFE sticker on the outer surface of the frameless superconducting magnet coil preparation device to prevent the superconducting magnet coil from sticking to the frame cylinder 1 and the frame end plate 2 during vacuum pressure impregnation of epoxy resin.

[0031] Step 2: Place the assembled frameless superconducting magnet coil on the frameless superconducting magnet coil preparation device to wind the superconducting magnet coil.

[0032] Step 3: Vacuum pressure impregnation of epoxy resin is performed on the wound frameless superconducting magnet coil. After curing, the epoxy resin, together with the coil spacer 3, becomes an integral part of the superconducting magnet coil.

[0033] Step 4: Remove the frame end plate 2 from the splicing frame, loosen the flange nut 8 of the support fixture, and remove the support rod 12 and support plate 11. Finally, remove the frame cylinder 1 to obtain the frameless superconducting magnet coil. The entire process can be carried out at room temperature without the need for a cryogenic environment.

[0034] The above description is merely an embodiment of the present invention and does not limit the scope of the invention. Any equivalent structural or procedural transformations made based on the description and drawings of this invention, or direct or indirect applications in other related system fields, are similarly included within the protection scope of this invention. Contents not described in detail in this specification are prior art known to those skilled in the art.

Claims

1. A frameless superconducting magnet coil fabrication apparatus, characterized in that, include: The splicing frame and support fixture are assembled. The splicing frame is set outside the support fixture and surrounds the support fixture. After the frameless superconducting magnet coil is prepared, the splicing frame and support fixture are separated. The splicing frame includes a frame cylinder, which is divided into three parts by mechanical processing. The cuts are beveled for disassembly of the frame cylinder. The three parts are assembled into a whole cylinder to provide radial support for the winding of the superconducting magnet coil. The support fixture includes a winding fixture shaft and multiple support plates and multiple support rods. One end of each support rod is fixed to the winding fixture shaft, and the other end is connected to the support plate. The support plate expands outward to support the frame cylinder.

2. The apparatus for fabricating frameless superconducting magnet coils according to claim 1, characterized in that, The splicing frame includes a frame cylinder, two frame end plates, multiple coil spacers and spacer connecting pieces, and two outer coil end plates. The frame cylinder is positioned between the two frame end plates. The two frame end plates are respectively positioned at both ends of the frame cylinder. The coil spacers are embedded in radial grooves in the frame cylinder. Each of the two outer coil end plates is tightly attached to one frame end plate and fitted onto the frame cylinder. An epoxy block is embedded between the two coil spacers to provide axial support during the winding of the superconducting magnet coil.

3. The apparatus for fabricating frameless superconducting magnet coils according to claim 2, characterized in that, The supporting fixture also includes a flange nut, a flange on the nut, and multiple fixed flanges; each fixed flange is welded axially to the winding fixture shaft, the flange nut is threaded to the winding fixture shaft, and the flange on the nut is clearance-fitted to the flange nut; one end of each support rod is connected to the bolt holes of the fixed flange and the flange on the nut through bolts, and the other end is connected to the bolt holes on the support plate through bolts.

4. The apparatus for fabricating frameless superconducting magnet coils according to claim 3, characterized in that, It also includes two limiting rings, which are respectively connected to the frame end plate and the winding tool shaft of the supporting tooling by bolts.

5. The apparatus for fabricating frameless superconducting magnet coils according to claim 2, characterized in that, The skeleton cylinder is machined with plate grooves for assembling and connecting the coil spacer plates; each skeleton end plate has an annular groove on its inner side for assembling and connecting with the skeleton cylinder, restricting the radial and axial movement of the skeleton cylinder.

6. The apparatus for fabricating frameless superconducting magnet coils according to claim 2, characterized in that, The coil spacer is composed of two semicircular rings spliced ​​together. The two semicircular rings are set in the plate groove of the skeleton cylinder and are connected and fixed by the spacer plate connecting piece. The coil spacer is used to separate different superconducting magnet coils and provide lateral support for the winding of superconducting magnet coils.

7. The apparatus for fabricating frameless superconducting magnet coils according to claim 2, characterized in that, The coil spacer plate has circular holes, which are filled and cured with epoxy resin during vacuum pressure impregnation. The two superconducting magnet coils are connected through the epoxy resin cured at the circular holes.

8. The apparatus for fabricating frameless superconducting magnet coils according to claim 2, characterized in that, The outer end plate of the circular coil is set inside the skeleton end plate and fits on the skeleton cylinder; the inner ring surface closely attached to the skeleton end plate is machined with inlet and outlet grooves for the inlet and outlet of the superconducting magnet coil winding; at the same time, blind holes are machined on the inner ring surface, which are filled and cured with epoxy resin during vacuum pressure impregnation, and are connected to the epoxy resin in the gap of the superconducting magnet coil as one unit.

9. A method for fabricating a frameless superconducting magnet coil, using the frameless superconducting magnet coil fabrication apparatus as described in any one of claims 1 to 8, characterized in that, include: Step 1: Complete the assembly of the frameless superconducting magnet coil preparation device. Spray a release agent or PTFE sticker onto the outer surface of the frameless superconducting magnet coil preparation device to prevent the superconducting magnet coil from sticking to the frame cylinder and frame end plate during vacuum pressure impregnation of epoxy resin. Step 2: Place the assembled frameless superconducting magnet coil on the frameless superconducting magnet coil preparation device to wind the superconducting magnet coil. Step 3: Vacuum pressure impregnation of epoxy resin is performed on the completed frameless superconducting magnet coil. After curing, the epoxy resin, together with the coil spacer plate, becomes an integral part of the superconducting magnet coil. Step 4: Remove the end plates of the splicing frame, loosen the flange nuts of the support fixture and remove the support rods and support plates. Finally, remove the frame cylinder to obtain the frameless superconducting magnet coil.

10. The method for fabricating a frameless superconducting magnet coil according to claim 9, characterized in that, In step 1, the upper part of the winding fixture shaft is machined with an external thread, which forms a threaded fit with the internal thread at the inner diameter of the flange nut. The inner diameter of the flange on the nut and the outer diameter of the flange nut are in clearance fit. Tightening the flange nut causes the flange nut to move axially, which in turn drives the flange on the nut, which is in clearance fit with the flange nut, to move axially. This causes the support plate to move radially. Tightening the flange nut expands it outward, and loosening the flange nut contracts it inward. Multiple support plates are set at different positions along the radial direction of the winding fixture shaft. Each support plate is fixed by multiple support rods at different positions along the axial direction of the winding fixture shaft and their corresponding fixed flanges. The outer side of each support plate is an arc surface, which fits against the inner circular surface of the splicing skeleton during assembly. After tightening the flange nut, the support plate of the support fixture expands outward to support the skeleton cylinder.

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