Inner cylinder assembly for superconducting magnet supporting structure, mold and preparation method

Abstract

The invention relates to an inner cylinder assembly for a superconducting magnet supporting structure, a mold and a preparation method, the inner cylinder assembly comprises a middle connecting piece, a left sleeve, a right sleeve, a left end clamping ring and a right end clamping ring which are integrally formed in a co-curing mode, the middle connecting piece, the left end clamping ring and the right end clamping ring are made of metal, and the left sleeve and the right sleeve are made of composite materials. The peripheral walls of the two ends of the left sleeve and the right sleeve are conical surfaces, the left-end clamping ring is clamped at the left end of the left sleeve, and the right-end clamping ring is clamped at the right end of the right sleeve; the left middle clamping ring is clamped at the right end of the left sleeve and is fixed on the flange, the right middle clamping ring is clamped at the left end of the right sleeve and is fixed on the flange, the left end cap is inserted into the left sleeve and is fixed with the left end clamping ring, and the right end cap is inserted into the right sleeve and is fixed with the right end clamping ring; the die has the advantages of being large in bearing strength and high in assembly precision, the die has the advantages of being convenient to disassemble and assemble and accurate in positioning, and the method has the advantages of being easy and convenient to operate and high in yield.

Description

Technical Field

[0001] This invention relates to a thermal insulation support structure, specifically to an inner cylinder assembly for a superconducting magnet support structure, as well as a mold and method for preparing the inner cylinder assembly. Background Technology

[0002] Superconducting electric levitation technology is the core of future high-speed maglev transportation power systems. The electrically levitated dynamic superconducting magnet is the mover (secondary) of the linear motor, and the Dewar fin and its internal composite material thermal insulation support structure, which maintain the superconducting magnet in an extremely low-temperature environment, are key components. This support structure needs to possess extremely high mechanical strength and excellent thermal insulation performance within a limited space to withstand enormous dynamic electromagnetic forces and minimize heat leakage in the liquid helium temperature range, thus keeping the superconducting coil at a low temperature and maintaining its superconducting state. The superconducting magnet support structure typically employs a multi-layered sleeve structure, as shown in the attached... Figure 1 As shown, the main components include a central support rod (a), an inner cylinder assembly (b), a left end cover of the cold shield (c), a right end cover of the cold shield (d), a middle layer composite sleeve (e), an outer layer metal sleeve (f), and an outer layer composite sleeve (g). The composite components are bonded to the metal components, and the metal components are connected by threads. (See attached image.) Figure 2 This diagram illustrates the working position and interface relationships of the support structure within the superconducting magnet. Here, h represents the cold shield, i represents the external Dewar of the superconducting magnet, and j represents the internal Dewar of the superconducting coil. The support structure is the core load-bearing and thermal management component, with the inner cylinder being the core load-bearing support structure. Currently, the superconducting magnet support structures used in this field all use adhesive bonding to connect the inner composite sleeve to the metal components. This method of simply preparing the composite and metal sleeve separately and then bonding them together is detrimental to the reliability and manufacturing precision of the connection. In actual prototype testing, connection failures such as debonding frequently occur, causing the entire support structure to fail to fulfill its intended support and thermal insulation functions. Furthermore, the adhesive strength is very limited at ultra-low temperatures, affecting assembly and manufacturing consistency and dimensional tolerance accuracy, easily leading to uneven stress and a high scrap rate. It should be noted that... Figure 1 and attached Figure 2 This is only for illustrating the structural composition and connection relationship of the superconducting magnet support structure, and does not represent the actual structure of the existing superconducting magnet support structure. In particular, the inner cylinder component b in the figure is a schematic diagram of the structure of this invention. Summary of the Invention

[0003] The purpose of this invention is to provide an inner cylinder assembly, mold, and preparation method for a superconducting magnet support structure. The inner cylinder assembly has the advantages of stable structure, high load-bearing strength, high assembly accuracy, and safety and reliability. The mold has the advantages of compact structure, convenient assembly and disassembly, and accurate positioning. The preparation method has the advantages of simple operation and high yield.

[0004] To address the problems existing in the prior art, this invention provides an inner cylinder assembly for a superconducting magnet support structure, comprising an intermediate connector, a left sleeve, a right sleeve, a left end retaining ring, and a right end retaining ring integrally formed by co-curing. The intermediate connector is made of metal and includes a sleeve with a flange in the middle of its outer peripheral wall. The left and right sleeves are made of heat-insulating composite material, and both ends of the left and right sleeves have frustum-shaped conical surfaces. The right end of the left sleeve fits onto the sleeve on the left side of the flange, and the left end of the right sleeve fits onto the sleeve on the right side of the flange. The left and right end retaining rings are made of metal. The inner peripheral wall of the left end retaining ring matches the conical surface of the left end of the left sleeve, and the left end retaining ring is formed by two left end half-rings joined together, which are correspondingly engaged on both sides of the left end of the left sleeve. The inner peripheral wall of the right end retaining ring matches the conical surface of the right end of the right sleeve, and the right end retaining ring is formed by two right end half-rings joined together. The system comprises two right-end half-rings that are correspondingly fitted onto the right sides of the right end of the right sleeve; it also includes a left center retaining ring, a right center retaining ring, a left end cap, and a right end cap, all made of metal and assembled with adhesive. The inner circumferential wall of the left center retaining ring matches the conical surface of the right end of the left sleeve. The left center retaining ring is formed by joining two left center half-rings together. The two left center half-rings are correspondingly fitted onto the right sides of the left sleeve and fixed to the flange with screws. The inner circumferential wall of the right center retaining ring matches the conical surface of the left end of the right sleeve. The right center retaining ring is formed by joining two right center half-rings together. The two right center half-rings are correspondingly fitted onto the left sides of the right sleeve and fixed to the flange with screws. The left end cap is inserted into the left sleeve from left to right and fixedly connected to the left center retaining ring with screws. The right end cap is inserted into the right sleeve from right to left and fixedly connected to the right end retaining ring with screws. Adhesive is applied between the left sleeve and the left center retaining ring and the left end cap, and between the right sleeve and the right center retaining ring and the right end cap.

[0005] Furthermore, the present invention provides an inner cylinder assembly for a superconducting magnet support structure, wherein the flange is provided with a first through hole distributed circumferentially, the left middle retaining ring is provided with a countersunk hole corresponding to the first through hole, and the right middle retaining ring is provided with a first threaded hole corresponding to the first through hole. The left middle retaining ring, the flange, and the right middle retaining ring are fixed together by a plurality of screws passing through the countersunk hole and the first through hole from left to right and screwed into the first threaded hole.

[0006] Furthermore, the present invention provides an inner cylinder assembly for a superconducting magnet support structure, wherein the left side of the left end retaining ring is provided with a first positioning block distributed circumferentially and in a cylindrical shape, the first positioning block is provided with a second threaded hole along the axis, the left end cap is provided with a first positioning groove corresponding to the first positioning block, the position of the first positioning groove is provided with a second through hole along the axis, and the left end cap is fixed to the left end retaining ring by a screw passing through the second through hole from left to right and screwed into the second threaded hole.

[0007] Furthermore, the present invention provides an inner cylinder assembly for a superconducting magnet support structure, wherein the right side of the right end retaining ring is provided with a second positioning block distributed circumferentially and in a cylindrical shape, the second positioning block is provided with a third threaded hole along the axis, the right end cap is provided with a second positioning groove corresponding to the second positioning block, the position of the second positioning groove is provided with a third through hole along the axis, and the right end cap is fixed to the right end retaining ring by a screw passing through the third through hole from right to left and screwed into the third threaded hole.

[0008] Furthermore, the present invention provides an inner cylinder assembly for a superconducting magnet support structure, wherein one end of the left semi-ring is provided with a third positioning block, the other end of the left semi-ring is provided with a third positioning groove that matches the third positioning block, one end of the right semi-ring is provided with a fourth positioning block, and the other end of the right semi-ring is provided with a fourth positioning groove that matches the fourth positioning block.

[0009] Furthermore, the present invention provides an inner cylinder assembly for a superconducting magnet support structure, wherein the metal is 304 stainless steel and the thermal insulation composite material is CFRP or alumina fiber reinforced resin matrix composite material.

[0010] Based on the same concept, the present invention also provides a co-curing mold for preparing the above-mentioned inner cylinder assembly, including a left core mold, a right core mold, a lower outer mold, an upper outer mold, a left end cap, and a right end cap. The outer diameters of the left core mold and the right core mold are equal. The left core mold has an operating hole and a screw mounting hole along the axis from left to right. The outer wall of the right end of the left core mold has a left annular platform for clamping the intermediate connecting sleeve. The right end of the right core mold has a fourth threaded hole along the axis. The left end of the right core mold has a fifth threaded hole along the axis that mates with the screw mounting hole. The outer wall of the left end of the right core mold has a right annular platform for clamping the intermediate connecting sleeve. The top of the lower outer mold and the bottom of the upper outer mold are matched with the intermediate connecting component, the left sleeve, the right sleeve, the left end retaining ring, and the right end retaining ring. The top two sides of the lower outer mold are respectively provided with a fifth positioning block that is spaced apart and cylindrical. The positioning block has a sixth threaded hole along the axis, the two ends of the lower outer mold have seventh threaded holes respectively, the bottom of the upper outer mold has a fifth positioning groove that mates with the fifth positioning block, the fifth positioning groove has a fourth through hole along the axis, the two ends of the upper outer mold have eighth threaded holes respectively, the left end cover has a fifth through hole that matches the left core mold along the axis, the right side of the left end cover has a sixth positioning groove that mates with the first positioning block, the sixth positioning groove has a sixth through hole along the axis, the left end cover does not yet have left end cover fixing holes corresponding to the seventh and eighth threaded holes, the right end cover has a seventh through hole that matches the right core mold along the axis, the left side of the right end cover has a seventh positioning groove that mates with the second positioning block, the seventh positioning groove has an eighth through hole along the axis, the right end cover does not yet have right end cover fixing holes corresponding to the seventh and eighth threaded holes.

[0011] Based on the same concept, the present invention also provides a method for preparing an inner cylinder assembly using the above-mentioned mold, comprising the following steps:

[0012] S1. The intermediate connector, left end retaining ring, right end retaining ring, left middle retaining ring, right middle retaining ring, left end cap and right end cap are made of metal materials, and the prepreg of the heat insulation composite material is also made.

[0013] S2. Fix the left core mold and the right core mold together coaxially, and apply a release agent to the left core mold and the right core mold, wherein the intermediate connector is snapped between the left core mold and the right core mold;

[0014] S3. Lay the prepreg on the left and right core molds, and attach the left and right retaining rings to the prepreg on the left end of the left core mold and the right end of the right core mold respectively.

[0015] S4. Place the assembly of each component formed in step S3 onto the lower outer mold, fix the upper outer mold onto the lower outer mold, and fix the left end cap and right end cap at both ends of the lower outer mold and the upper outer mold respectively; wherein, the upper side of the lower outer mold, the lower side of the upper outer mold, the right side of the left end cap and the left side of the right end cap are all coated with a release agent.

[0016] S5. Place the assembly of each component formed in step S4 into a hot autoclave and cure it according to the set temperature and pressure curve. After curing, remove the left end cover, right end cover, lower outer mold, upper outer mold, left core mold and right core mold to obtain an integrally formed assembly of the middle connector, left sleeve, right sleeve, left end retaining ring and right end retaining ring.

[0017] S6. The left middle retaining ring, the right middle retaining ring, the left end cap, and the right end cap are respectively installed on the integrally molded assembly obtained in step S5 by adhesive bonding. The left middle retaining ring and the right middle retaining ring are respectively snapped into the right end of the left sleeve and the left end of the right sleeve and fixed to the intermediate connector with screws. The left end cap is inserted into the left sleeve from left to right and fixed to the left end retaining ring with screws. The right end cap is inserted into the right sleeve from right to left and fixed to the right end retaining ring with screws.

[0018] Furthermore, the present invention provides a method for preparing an inner cylinder assembly, wherein, in step S1, the metal is 304 stainless steel, and the thermal insulation composite material is CFRP or alumina fiber reinforced resin matrix composite material.

[0019] Furthermore, in a method for preparing an inner cylinder assembly according to the present invention, in step S6, the adhesive bonding refers to applying adhesive between the left sleeve and the left middle retaining ring and the left end cap, and between the right sleeve and the right middle retaining ring and the right end cap during the assembly process.

[0020] Compared with existing technologies, the present invention provides an inner cylinder assembly, mold, and preparation method for a superconducting magnet support structure, which has the following advantages: The present invention incorporates a co-cured, integrally molded intermediate connector, left sleeve, right sleeve, left end retaining ring, and right end retaining ring. The intermediate connector is made of metal and includes a sleeve with a flange in the middle of its outer peripheral wall. The left and right sleeves are made of heat-insulating composite materials, and both ends of the left and right sleeves have frustum-shaped conical surfaces. The structure consists of a left sleeve with its right end fitted onto the sleeve on the left side of the flange, and a right sleeve with its left end fitted onto the sleeve on the right side of the flange. Both the left and right retaining rings are made of metal, with the inner circumferential wall of the left retaining ring matching the conical surface of the left end of the left sleeve. The left retaining ring is a split structure consisting of two joined left-end half-rings, with the two left-end half-rings correspondingly fitted onto the left sides of the left sleeve. Similarly, the inner circumferential wall of the right retaining ring matches the conical surface of the right end of the right sleeve. The right retaining ring is also a split structure consisting of two joined right-end half-rings. The structure is a split design, in which two right-end half-rings are correspondingly fitted onto the right ends of the right sleeve. Simultaneously, a left-center retaining ring, a right-center retaining ring, a left-end cap, and a right-end cap, all made of metal and assembled with adhesive bonding, are provided. The inner circumferential wall of the left-center retaining ring matches the conical surface of the right end of the left sleeve. The left-center retaining ring is a split structure composed of two left-center half-rings joined together, with the two left-center half-rings correspondingly fitted onto the right ends of the left sleeve and fixed to the flange with screws. The inner circumferential wall of the right-center retaining ring matches the conical surface of the right end of the right sleeve. The conical surfaces of the ends are matched, and the right middle retaining ring adopts a split structure composed of two right middle half-rings joined together. The two right middle half-rings are correspondingly snapped onto the left ends of the right sleeve and fixed to the flange with screws. The left end cap is inserted into the left sleeve from left to right and fixed to the left end retaining ring with screws. The right end cap is inserted into the right sleeve from right to left and fixed to the right end retaining ring with screws. Adhesive is applied between the left sleeve and the left middle retaining ring and the left end cap, and between the right sleeve and the right middle retaining ring and the right end cap. This constitutes a robust, high-load-bearing, high-precision, and reliable inner cylinder assembly for supporting superconducting magnets. This invention utilizes co-curing to integrally mold the intermediate connector, left sleeve, right sleeve, left end retaining ring, and right end retaining ring, thereby improving connection stability and assembly accuracy. By setting conical surfaces at both ends of the left and right sleeves and providing matching left end retaining rings, right end retaining rings, left middle retaining rings, and right middle retaining rings, and by fixing the left end retaining rings and right end retaining rings to the left end caps and right end caps respectively with screws, and by fixing the left middle retaining rings and right middle retaining rings to the flange of the intermediate connector with screws, a wedge-shaped connection structure is formed between the two ends of the left and right sleeves and the corresponding retaining rings, enhancing connection strength and stability. By applying adhesive between the left sleeve and the left middle retaining ring and the left end cap, and between the right sleeve and the right middle retaining ring and the right end cap, the connection strength and stability are further enhanced.The co-curing mold provided by the present invention has the advantages of compact structure, convenient assembly and disassembly, and accurate positioning. The method for preparing inner cylinder components provided by the present invention has the advantages of simple operation and high yield.

[0021] The following detailed description, in conjunction with the accompanying drawings, illustrates an inner cylinder assembly, mold, and preparation method for a superconducting magnet support structure according to the present invention. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the superconducting magnet support structure;

[0023] Figure 2 This is a diagram showing the operational status of the superconducting magnet support structure.

[0024] Figure 3 This is a front view of the inner cylinder assembly used in the superconducting magnet support structure according to the present invention;

[0025] Figure 4 This is a cross-sectional view of the inner cylinder assembly used in the superconducting magnet support structure of the present invention;

[0026] Figure 5 This is an isometric view of the inner cylinder assembly used in the superconducting magnet support structure of the present invention;

[0027] Figure 6 This is an exploded view of the inner cylinder assembly used in the superconducting magnet support structure of the present invention;

[0028] Figure 7 This is a front view of the co-curing mold used to prepare the inner cylinder assembly according to the present invention;

[0029] Figure 8 This is a cross-sectional view of the co-curing mold used to prepare the inner cylinder assembly according to the present invention;

[0030] Figure 9 Axonometric view of the co-curing mold used to prepare the inner cylinder assembly according to the present invention;

[0031] Figure 10 An exploded view of the co-curing mold used to prepare the inner cylinder assembly for this invention. Detailed Implementation

[0032] First, it should be noted that the directional terms such as up, down, left, right, front, and back used in this invention are merely descriptions based on the accompanying drawings for ease of understanding, and are not intended to limit the technical solution or the scope of protection claimed in this invention.

[0033] like Figures 3 to 6The present invention illustrates a specific embodiment of an inner cylinder assembly for a superconducting magnet support structure, comprising an intermediate connector 1, a left sleeve 2, a right sleeve 3, a left end retaining ring 4, and a right end retaining ring 5, all integrally formed by co-curing. The intermediate connector 1 is made of metal and includes a sleeve 11 with a flange 12 located in the middle of its outer peripheral wall. The left sleeve 2 and right sleeve 3 are made of heat-insulating composite material, and both ends of their outer peripheral walls have a frustum-shaped conical structure. The right end of the left sleeve 2 fits onto the sleeve 11 on the left side of the flange 12, and the left end of the right sleeve 3 fits onto the sleeve 11 on the right side of the flange 12. The left and right retaining rings 4 and 5 are made of metal. The inner circumferential wall of the left retaining ring 4 is matched with the conical surface of the left end of the left sleeve 2. The left retaining ring 4 adopts a split structure consisting of two left half-rings 41 joined together for easy installation. The two left half-rings 41 are correspondingly snapped onto the left side of the left sleeve 2. The inner circumferential wall of the right retaining ring 5 is matched with the conical surface of the right end of the right sleeve 3. The right retaining ring 5 adopts a split structure consisting of two right half-rings 51 joined together for easy installation. The two right half-rings 51 are correspondingly snapped onto the right side of the right sleeve 3. Simultaneously, a left middle retaining ring 6, a right middle retaining ring 7, a left end cap 8, and a right end cap 9, all made of metal and assembled using adhesive bonding, are also provided. The inner circumferential wall of the left center retaining ring 6 is aligned with the conical surface of the right end of the left sleeve 2. The left center retaining ring 6 is a split structure consisting of two joined left center half-rings 61 for easy installation. The two left center half-rings 61 are correspondingly snapped onto the right ends of the left sleeve 2 and fixed to the flange 12 with screws. The inner circumferential wall of the right center retaining ring 7 is aligned with the conical surface of the left end of the right sleeve 3. The right center retaining ring 7 is a split structure consisting of two joined right center half-rings 71 for easy installation. The two right center half-rings 71 are correspondingly snapped onto the left ends of the right sleeve 3 and fixed to the flange 12 with screws. The left end cap 8 is inserted into the left sleeve 2 from left to right and fixed to the left end retaining ring 4 with screws. The right end cap 9 is inserted into the right sleeve 3 from right to left and fixed to the right end retaining ring 5 with screws. Adhesive is applied between the left sleeve 2 and the left middle retaining ring 6 and the left end cap 8, and between the right sleeve 3 and the right middle retaining ring 7 and the right end cap 9.

[0034] The above configuration constitutes an inner cylinder assembly for superconducting magnet support structures that is structurally stable, has high load-bearing capacity, high assembly precision, and is safe and reliable. This invention utilizes a co-curing process to integrally mold the intermediate connector 1, left sleeve 2, right sleeve 3, left end retaining ring 4, and right end retaining ring 5, thereby improving connection stability and assembly accuracy. By setting conical surfaces at both ends of the left sleeve 2 and right sleeve 3, and providing matching left end retaining ring 4, right end retaining ring 5, left middle retaining ring 6, and right middle retaining ring 7, and by fixing the left end retaining ring 4 and right end retaining ring 5 to the left end cap 8 and right end cap 9 respectively with screws, and by fixing the left middle retaining ring 6 and right middle retaining ring 7 to the flange 12 of the intermediate connector 1 with screws, a wedge-shaped connection structure is formed between the ends of the left sleeve 2 and right sleeve 3 and the corresponding retaining rings, enhancing connection strength and stability. By applying adhesive between the left sleeve 2 and the left middle retaining ring 6 and left end cap 8, and between the right sleeve 3 and the right middle retaining ring 7 and right end cap 9, the connection strength and stability are further enhanced. It should be noted that, in practical applications, this invention typically uses 304 stainless steel for the metals used to manufacture the intermediate connector 1, left end retaining ring 4, right end retaining ring 5, left middle retaining ring 6, right middle retaining ring 7, left end cap 8, and right end cap 9. This is to fully utilize its non-magnetic and low thermal conductivity properties, and to improve the strength and corrosion resistance of each component. Furthermore, the thermal insulation composite materials used to manufacture the left sleeve 2 and right sleeve 3 are made of CFRP or alumina fiber reinforced resin matrix composites to fully utilize their high strength and modulus at low temperatures. It should be pointed out that the aforementioned metals are not limited to 304 stainless steel; other metal materials with similar properties can also be used. Similarly, the thermal insulation composite materials are not limited to CFRP and alumina fiber reinforced resin matrix composites; other composite materials with similar properties can also be used.

[0035] In a specific implementation, to improve the convenience of disassembly and assembly, the present invention provides circumferentially distributed first through holes 13 on the flange 12, countersunk holes 62 corresponding to the first through holes 13 on the left middle retaining ring 6, and first threaded holes 72 corresponding to the first through holes 13 on the right middle retaining ring 7. The left middle retaining ring 6, flange 12, and right middle retaining ring 7 are fixed together by multiple screws passing through the countersunk holes 62 and the first through holes 13 from left to right and screwed into the first threaded holes 72. Similarly, the present invention provides circumferentially distributed cylindrical first positioning blocks 42 on the left side of the left end retaining ring 4, and second threaded holes 43 are provided along the axis on the first positioning blocks 42. Correspondingly, the left end cap 8 is provided with first positioning grooves corresponding to the first positioning blocks 42, and second through holes 81 are provided along the axis at the positions of the first positioning grooves. The left end cap 8 is fixed to the left end retaining ring 4 by screws passing through the second through holes 81 from left to right and screwed into the second threaded holes 43. This structure improves assembly accuracy by correspondingly providing a first positioning block 42 and a first positioning groove on the left end retaining ring 4 and the left end cap 8. Similarly, the present invention provides a second positioning block 52, which is circumferentially distributed and cylindrical, on the right side of the right end retaining ring 5, and a third threaded hole is provided on the second positioning block 52 along the axis; correspondingly, a second positioning groove is provided on the right end cap 9, which corresponds one-to-one with the second positioning block 52, and a third through hole 91 is provided at the position of the second positioning groove along the axis. The right end cap 9 is fixed to the right end retaining ring 5 by a screw that passes through the third through hole 91 from right to left and is screwed into the third threaded hole. This structure also improves assembly accuracy by correspondingly providing a second positioning block 52 and a second positioning groove on the right end retaining ring 5 and the right end cap 9. In practical applications, this invention also provides a third positioning block 44 at one end of the left half-ring 41 and a third positioning groove 45 matching the third positioning block 44 at the other end of the left half-ring 41. Thus, when the two left half-rings 41 are joined to form the left end retaining ring 4, the cooperation of the third positioning groove 45 and the third positioning block 44 improves both operational convenience and assembly accuracy. Similarly, this invention provides a fourth positioning block 53 at one end of the right half-ring 51 and a fourth positioning groove 54 matching the fourth positioning block 53 at the other end of the right half-ring 51. Thus, when the two right half-rings 51 are joined to form the right end retaining ring 5, the cooperation of the fourth positioning groove 54 and the fourth positioning block 53 also improves operational convenience and assembly accuracy.

[0036] Based on the same concept, such as Figures 7 to 10As shown, the present invention also improves a co-curing mold for preparing the above-mentioned inner cylinder assembly, including a left core mold 1', a right core mold 2', a lower outer mold 3', an upper outer mold 4', a left end cap 5', and a right end cap 6'. The outer diameters of the left core mold 1' and the right core mold 2' are equal. The left core mold 1' is provided with an operating hole 11' and a screw mounting hole 12' from left to right along the axis. The outer wall of the right end of the left core mold 1' is provided with a left annular platform 13' for clamping the intermediate connector 1 sleeve 11. The right end of the right core mold 2' is provided with a fourth threaded hole 21' along the axis to facilitate demolding. The left end of the right core mold 2' is provided with a fifth threaded hole 22' that mates with the screw mounting hole 12' along the axis to facilitate connecting the left core mold 1' and the right core mold 2'. The outer wall of the left end of the right core mold 2' is provided with a right annular platform 23' for clamping the intermediate connector 1 sleeve 11. The top of the lower outer mold 3' and the bottom of the upper outer mold 4' are matched with the intermediate connector 1, left sleeve 2, right sleeve 3, left end retaining ring 4, and right end retaining ring 5. Fifth positioning blocks 31', cylindrical in shape and spaced apart, are respectively provided on both sides of the top of the lower outer mold 3'. A sixth threaded hole 32' is provided along the axis on the fifth positioning block 31'. Seventh threaded holes 33' are respectively provided at both ends of the lower outer mold 3' to facilitate the connection of the left end cap 5' and the right end cap 6'. Correspondingly, a fifth positioning groove that mates with the fifth positioning block 31' is provided at the bottom of the upper outer mold 4'. A fourth through hole 41' is provided along the axis at the position of the fifth positioning groove to facilitate the connection of the lower outer mold 3' and the upper outer mold 4'. Eighth threaded holes 42' are respectively provided at both ends of the upper outer mold 4' to facilitate the connection of the left end cap 5' and the right end cap 6'. The left end cover 5' is provided with a fifth through hole 51' that matches the left core mold 1' along the axis. A sixth positioning groove that mates with the first positioning block 42 is provided on the right side of the left end cover 5'. A sixth through hole 52' is provided along the axis at the position of the sixth positioning groove. A left end cover fixing hole 53' corresponding to the seventh threaded hole 33' and the eighth threaded hole 42' is provided on the left end cover 5'. Similarly, the right end cover 6' is provided with a seventh through hole 61' that matches the right core mold 2' along the axis. A seventh positioning groove that mates with the second positioning block 52 is provided on the left side of the right end cover 6'. An eighth through hole 62' is provided along the axis at the position of the seventh positioning groove. A right end cover fixing hole 63' corresponding to the seventh threaded hole 33' and the eighth threaded hole 42' is provided on the right end cover 6'.

[0037] The above setup constitutes a co-curing mold with a compact structure, convenient assembly and disassembly, and accurate positioning. In practical applications, firstly, screws are passed from left to right through the screw mounting holes 12' and screwed into the fifth threaded hole 22' to coaxially fix the left core mold 1' and right core mold 2' together, and the intermediate connector 1 is snapped between the left core mold 1' and right core mold 2'; then, the prepreg of the thermal insulation composite material is laid on the left core mold 1' and right core mold 2', and left end retaining ring 4 and right end retaining ring 5 are snapped onto the prepreg at the left end of the left core mold 1' and the right end of the right core mold 2', respectively; then, the left core mold 1', right core mold 2', intermediate connector 1, and prepreg are assembled. The assembly of the material, left end retaining ring 4, and right end retaining ring 5 is placed on the lower outer mold 3', and the upper outer mold 4' is fastened onto the lower outer mold 3' and fixed by screws installed in the fourth through hole 41' and the sixth threaded hole 32'. Finally, the left end cap 5' and the right end cap 6' are fixed to the two ends of the lower outer mold 3' and the upper outer mold 4' by screws. The mold can then be placed in a thermostatic jar for curing. After curing and demolding, an integrally formed assembly of the intermediate connector 1, left sleeve 2, right sleeve 3, left end retaining ring 4, and right end retaining ring 5 is obtained. Subsequently, the left middle retaining ring 6, right middle retaining ring 7, left end cap 8, and right end cap 9 are assembled by lamination to obtain the inner cylinder assembly. This invention improves the positioning accuracy of the left end retaining ring 4 and the right end retaining ring 5 by setting a sixth positioning groove on the left end cover 5' that cooperates with the first positioning block 42 and a seventh positioning groove on the right end cover 6' that cooperates with the second positioning block 52, thus ensuring the yield of the cured product. By setting corresponding fifth positioning blocks 31' and fifth positioning grooves on the lower outer mold 3' and the upper outer mold 4', the convenience and accuracy of their assembly are improved.

[0038] Based on the same concept, the present invention also provides a method for preparing an inner cylinder assembly using a co-curing mold, which includes the following steps:

[0039] S1. The intermediate connector 1, left end retaining ring 4, right end retaining ring 5, left middle retaining ring 6, right middle retaining ring 7, left end cap 8 and right end cap 9 are made of metal materials, and the prepreg of the heat insulation composite material is also made.

[0040] S2. Fix the left core mold 1' and the right core mold 2' together coaxially, and apply a release agent to the left core mold 1' and the right core mold 2', wherein the intermediate connector 1 is snapped between the left core mold 1' and the right core mold 2'.

[0041] S3. Lay the prepreg on the left core mold 1' and the right core mold 2', and attach the left end retaining ring 4 and the right end retaining ring 5 to the prepreg on the left end of the left core mold 1' and the right end of the right core mold 2' respectively.

[0042] S4. Place the assembly of components formed in step S3 onto the lower outer mold 3', fix the upper outer mold 4' onto the lower outer mold 3', and fix the left end cap 5' and the right end cap 6' to the lower outer mold 3' and the upper outer mold 4' respectively. The upper side of the lower outer mold 3', the lower side of the upper outer mold 4', the right side of the left end cap 5', and the left side of the right end cap 6' are all coated with a release agent.

[0043] S5. Place the assembly of each component formed in step S4 into an autoclave and cure it according to the set temperature and pressure curve. After curing, remove the left end cover 5', right end cover 6', lower outer mold 3', upper outer mold 4', left core mold 1' and right core mold 2' to obtain an integrally formed assembly of the intermediate connector 1, left sleeve 2, right sleeve 3, left end retaining ring 4 and right end retaining ring 5.

[0044] S6. The left middle retaining ring 6, the right middle retaining ring 7, the left end cap 8, and the right end cap 9 are respectively installed on the integrally molded assembly obtained in step S5 by adhesive bonding. The left middle retaining ring 6 and the right middle retaining ring 7 are respectively snapped into the right end of the left sleeve 2 and the left end of the right sleeve 3 and fixed to the intermediate connecting piece 1 with screws. The left end cap 8 is inserted into the left sleeve 2 from left to right and fixed to the left end retaining ring 4 with screws. The right end cap 9 is inserted into the right sleeve 3 from right to left and fixed to the right end retaining ring 5 with screws.

[0045] In step S1, the metal is 304 stainless steel, and the thermal insulation composite material is CFRP or alumina fiber reinforced resin matrix composite material. In step S6, the adhesive-coated assembly refers to applying adhesive between the left sleeve 2 and the left middle retaining ring 6 and the left end cap 8, and between the right sleeve 3 and the right middle retaining ring 7 and the right end cap 9 during the assembly process.

[0046] Practical application has shown that the inner cylinder assembly for superconducting magnet support structures provided by this invention can produce the following beneficial effects:

[0047] (1) This invention makes the connection between the composite material and the metal in the core inner cylinder assembly of the superconducting magnet thermal insulation support structure more reliable, increasing the connection strength by more than 150%, thereby increasing the load-bearing capacity of the inner cylinder assembly from 33kN to 45kN, an increase of 36.4%. At the same time, it effectively ensures the coaxiality of the composite sleeve and the intermediate connector, as well as the perpendicularity of the composite sleeve and the end cap, thus improving the assembly accuracy of the inner cylinder assembly and improving the load-bearing effect. (2) This invention also improves the process assembly efficiency, avoids the process uncertainty caused by manual labor, and drastically reduces the scrap rate. By designing a matching co-curing mold, it improves the processability and economy, and controls the cost. (3) As the design and manufacturing method of the core inner cylinder assembly of the entire superconducting magnet thermal insulation support assembly, this invention plays an important role in the connection reliability and load-bearing capacity of the entire thermal insulation support assembly, with obvious benefits.

[0048] The above embodiments are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Various modifications made by those skilled in the art based on the technical solutions of the present invention without departing from the design concept of the present invention should fall within the scope of protection defined by the claims of the present invention.

Claims

1. An inner cylinder assembly for a superconducting magnet support structure, characterized by, The system includes an intermediate connector (1), a left sleeve (2), a right sleeve (3), a left end retaining ring (4), and a right end retaining ring (5), all integrally formed by co-curing. The intermediate connector (1) is made of metal and includes a sleeve (11). A flange (12) is provided in the middle of the outer peripheral wall of the sleeve (11). The left sleeve (2) and the right sleeve (3) are made of heat-insulating composite material. The outer peripheral walls of both ends of the left sleeve (2) and the right sleeve (3) are frustoconical conical surfaces. The right end of the left sleeve (2) is fitted onto the sleeve (11) on the left side of the flange (12). The right end of the right sleeve... (3) The left end is fitted onto the sleeve (11) on the right side of the flange (12). The left end retaining ring (4) and the right end retaining ring (5) are made of metal. The inner circumferential wall of the left end retaining ring (4) matches the conical surface of the left end of the left sleeve (2). The left end retaining ring (4) is formed by two left end half rings (41) joined together. The two left end half rings (41) are correspondingly fitted onto the left end of the left sleeve (2). The inner circumferential wall of the right end retaining ring (5) matches the conical surface of the right end of the right sleeve (3). The right end retaining ring (5) is formed by two right end half rings (51) joined together. The two right end half rings (51) are correspondingly fitted onto the right end of the left sleeve (2). On both sides of the right end of the right sleeve (3), there are also left center retaining ring (6), right center retaining ring (7), left end cap (8), and right end cap (9) made of metal and assembled by adhesive bonding. The inner circumferential wall of the left center retaining ring (6) matches the conical surface of the right end of the left sleeve (2). The left center retaining ring (6) is composed of two left center half-rings (61) joined together. The two left center half-rings (61) are correspondingly clamped on both sides of the right end of the left sleeve (2) and fixed to the flange (12) by screws. The inner circumferential wall of the right center retaining ring (7) matches the conical surface of the left end of the right sleeve (3). The right center retaining ring (7) It is composed of two right middle half rings (71) joined together. The two right middle half rings (71) are respectively clamped on the left side of the right sleeve (3) and fixed to the flange (12) by screws. The left end cap (8) is inserted into the left sleeve (2) from left to right and fixedly connected to the left end retaining ring (4) by screws. The right end cap (9) is inserted into the right sleeve (3) from right to left and fixedly connected to the right end retaining ring (5) by screws. Adhesive is applied between the left sleeve (2) and the left middle retaining ring (6) and the left end cap (8), and between the right sleeve (3) and the right middle retaining ring (7) and the right end cap (9).

2. An inner cylinder assembly for a support structure of a superconducting magnet according to claim 1, characterized in that, The flange (12) is provided with first through holes (13) distributed circumferentially, the left middle retaining ring (6) is provided with countersunk holes (62) corresponding to the first through holes (13), and the right middle retaining ring (7) is provided with first threaded holes (72) corresponding to the first through holes (13). The left middle retaining ring (6), the flange (12) and the right middle retaining ring (7) are fixed together by a plurality of screws passing through the countersunk holes (62) and the first through holes (13) from left to right and screwed into the first threaded holes (72).

3. An inner cylinder assembly for a superconducting magnet support structure according to claim 2, wherein, The left end retaining ring (4) has a first positioning block (42) that is cylindrical and distributed circumferentially on the left side. The first positioning block (42) has a second threaded hole (43) along the axis. The left end cap (8) has a first positioning groove that corresponds to the first positioning block (42). The first positioning groove has a second through hole (81) along the axis. The left end cap (8) is fixed to the left end retaining ring (4) by a screw that passes through the second through hole (81) from left to right and is screwed into the second threaded hole (43).

4. An inner cylinder assembly for a support structure of a superconducting magnet according to claim 3, characterized in that, The right end retaining ring (5) has a second positioning block (52) that is cylindrical and distributed circumferentially on the right side. The second positioning block (52) has a third threaded hole along the axis. The right end cap (9) has a second positioning groove that corresponds to the second positioning block (52). The second positioning groove has a third through hole (91) along the axis. The right end cap (9) is fixed to the right end retaining ring (5) by a screw that passes through the third through hole (91) from right to left and is screwed into the third threaded hole.

5. An inner cylinder assembly for a support structure of a superconducting magnet according to claim 4, characterized in that, One end of the left half ring (41) is provided with a third positioning block (44), and the other end of the left half ring (41) is provided with a third positioning groove (45) that matches the third positioning block (44). One end of the right half ring (51) is provided with a fourth positioning block (53), and the other end of the right half ring (51) is provided with a fourth positioning groove (54) that matches the fourth positioning block (53).

6. The inner cylinder assembly for a support structure of a superconducting magnet according to claim 1, characterized by, The metal is 304 stainless steel, and the thermal insulation composite material is CFRP or alumina fiber reinforced resin matrix composite material.

7. A co-curing mold for making the inner barrel assembly of claim 4, wherein, The assembly includes a left core mold (1'), a right core mold (2'), a lower outer mold (3'), an upper outer mold (4'), a left end cap (5'), and a right end cap (6'). The outer diameters of the left core mold (1') and the right core mold (2') are equal. The left core mold (1') has an operating hole (11') and a screw mounting hole (12') along the axis from left to right. The right end of the left core mold (1') has a left annular platform (13') for mounting the intermediate connector (1) sleeve (11). The right end of the right core mold (2') has a fourth threaded hole (21') along the axis. The left end of the right core mold (2') has a fourth threaded hole (21') along the axis. The lower outer mold (3') is provided with a fifth threaded hole (22') that mates with the screw mounting hole (12'). The outer wall of the left end of the right core mold (2') is provided with a right ring platform (23') for mounting the intermediate connector (1) sleeve (11). The top of the lower outer mold (3') and the bottom of the upper outer mold (4') are matched with the intermediate connector (1), the left sleeve (2), the right sleeve (3), the left end retaining ring (4), and the right end retaining ring (5). The top two sides of the lower outer mold (3') are respectively provided with fifth positioning blocks (31') that are spaced apart and cylindrical. The fifth positioning blocks (31') are provided with a sixth threaded hole along the axis. The lower outer mold (3') has a seventh threaded hole (33') at both ends. The upper outer mold (4') has a fifth positioning groove at the bottom that mates with the fifth positioning block (31'). The fifth positioning groove has a fourth through hole (41') along the axis. The upper outer mold (4') has an eighth threaded hole (42') at both ends. The left end cover (5') has a fifth through hole (51') along the axis that matches the left core mold (1'). The right side of the left end cover (5') has a sixth positioning groove that mates with the first positioning block (42). The sixth positioning groove has a sixth threaded hole along the axis. The left end cover (5') does not yet have a left end cover fixing hole (53') corresponding to the seventh threaded hole (33') and the eighth threaded hole (42'). The right end cover (6') is provided with a seventh through hole (61') matching the right core mold (2') along the axis. The left side of the right end cover (6') is provided with a seventh positioning groove that cooperates with the second positioning block (52). The position of the seventh positioning groove is provided with an eighth through hole (62') along the axis. The right end cover (6') does not yet have a right end cover fixing hole (63') corresponding to the seventh threaded hole (33') and the eighth threaded hole (42').

8. A method of making an inner barrel assembly using the mold of claim 7, wherein, Includes the following steps: S1. Use metal materials to make intermediate connector (1), left end retaining ring (4), right end retaining ring (5), left middle retaining ring (6), right middle retaining ring (7), left end cap (8) and right end cap (9), and make prepreg of heat insulation composite material; S2. Fix the left core mold (1') and the right core mold (2') together coaxially, and apply a release agent to the left core mold (1') and the right core mold (2'), wherein the intermediate connector (1) is fitted between the left core mold (1') and the right core mold (2'); S3. Lay the prepreg on the left core mold (1') and the right core mold (2'), and attach the left end retaining ring (4) and the right end retaining ring (5) to the prepreg on the left end of the left core mold (1') and the right end of the right core mold (2'). S4. Place the assembly of each component formed in step S3 on the lower outer mold (3'), fix the upper outer mold (4') on the lower outer mold (3'), and fix the left end cap (5') and the right end cap (6') at both ends of the lower outer mold (3') and the upper outer mold (4'); wherein, the upper side of the lower outer mold (3'), the lower side of the upper outer mold (4'), the right side of the left end cap (5') and the left side of the right end cap (6') are all coated with a release agent; S5. Place the assembly of each component formed in step S4 into a hot autoclave and cure it according to the set temperature and pressure curve. After curing, remove the left end cover (5'), right end cover (6'), lower outer mold (3'), upper outer mold (4'), left core mold (1') and right core mold (2') to obtain an integrally formed assembly of the intermediate connector (1), left sleeve (2), right sleeve (3), left end retaining ring (4) and right end retaining ring (5). S6. The left middle retaining ring (6), the right middle retaining ring (7), the left end cap (8) and the right end cap (9) are respectively installed on the integrally molded assembly obtained in step S5 by adhesive bonding. The left middle retaining ring (6) and the right middle retaining ring (7) are respectively snapped into the right end of the left sleeve (2) and the left end of the right sleeve (3) and fixed to the middle connector (1) with screws. The left end cap (8) is inserted into the left sleeve (2) from left to right and fixed to the left end retaining ring (4) with screws. The right end cap (9) is inserted into the right sleeve (3) from right to left and fixed to the right end retaining ring (5) with screws.

9. The method of making an inner barrel assembly of claim 8, wherein, In step S1, the metal is 304 stainless steel, and the thermal insulation composite material is CFRP or alumina fiber reinforced resin matrix composite material.

10. The method of claim 8, wherein the inner tube assembly is prepared by, In step S6, the adhesive bonding refers to applying adhesive between the left sleeve (2) and the left middle retaining ring (6) and the left end cap (8) during the assembly process, and between the right sleeve (3) and the right middle retaining ring (7) and the right end cap (9).

Images