Equipment and method for lifting fusion reactor bottom polar field magnet in place

Abstract

The invention provides a device and method for lifting a polar field magnet at the bottom of a fusion reactor in place, and belongs to the technical field of fusion reactor installing.The device is provided with a plurality of sets of hydraulic lifters, each hydraulic lifter comprises a hydraulic cylinder assembly, a piston assembly, a clamping assembly and a supporting plate, and a cylinder body of each hydraulic cylinder assembly is fixed to the bottom of the supporting plate; the piston assembly is axially installed in the cylinder body in a sliding mode, the clamping assembly is installed in the piston assembly, the clamping assembly comprises a plurality of clamping rods annularly arrayed in the piston assembly, and the clamping rods axially and elastically stretch out and draw back in the piston assembly to clamp a steel strand rope; one end of the steel strand rope is connected with the supporting plate, and the other end bypasses the reversing wheel and penetrates through the supporting plate and the shaft hole; when oil enters the first oil hole of the cylinder body, the second oil hole is closed, the clamping rod slides in the axial direction to clamp the steel strand rope, oil exits from the second oil hole, the piston assembly and the steel strand rope synchronously move downwards, and the polar field magnet is lifted. The device is simple and compact in structure and low in manual dependence, and the installation efficiency of the fusion reactor bottom polar magnetic field can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fusion reactor installation. Specifically, the present invention mainly relates to a device and method for lifting and positioning a poloidal field magnet at the bottom of a fusion reactor. Background Art

[0002] Solving the energy problem is one of the most pressing issues facing all countries today. Nuclear fusion energy is a new type of clean energy, and controlled nuclear fusion is a key area of ​​research and exploration being actively pursued worldwide. Controlled nuclear fusion utilizes a fusion device called a tokamak to magnetically confine high-temperature plasma, causing it to fuse within a vacuum chamber, releasing enormous amounts of energy that is then converted for human use. A fusion device consists of thousands of components, and the poloidal field magnet is a core component of the device's mainframe system and a crucial element in the device's construction. Its assembly process is complex, especially the bottom poloidal field magnet, which needs to be temporarily hoisted into the mainframe foundation pit. Once the longitudinal field magnet is in place, the temporarily positioned poloidal field magnet is then lifted to the longitudinal field magnet mounting surface and finally installed.

[0003] At present, the final placement of the poloidal field magnets at the bottom of domestic fusion reactors is achieved by using a jacking structure. The poloidal field magnets are temporarily hoisted on a hydraulic jacking fixture. The jacking fixtures are divided into A / B groups and evenly alternately arranged. After the A group is lifted up, a pad of fixed thickness is placed on the B group fixture. The two groups of fixtures repeat the work alternately to lift the bottom poloidal field magnet to a predetermined height and finally put it in place. This jacking method is complicated to operate and slow. It requires operators to work at height and continuously insert pads between the jacking fixture and the poloidal field magnet. In addition, this jacking fixture has a complex structure and is expensive. Summary of the Invention

[0004] The present invention provides an apparatus and method for lifting the poloidal field magnet at the bottom of a fusion reactor into position. The apparatus and method aim to utilize a simple and reliable structure to conveniently lift the poloidal field magnet of a compact fusion reactor in space, with a moderate load. The number of lifters can be increased or decreased according to the weight of the poloidal field magnet. The apparatus and method are simple to operate, economical and applicable, do not require excessive manual work, and can automatically control the lifters to operate continuously, accurately lifting the poloidal field magnet into position step by step.

[0005] In order to achieve the above-mentioned purpose, those skilled in the art have adopted the following technical solutions: a device for lifting the poloidal field magnet at the bottom of a fusion reactor into position, comprising a plurality of hydraulic lifts that are started alternately, the hydraulic lifts comprising a hydraulic cylinder assembly, a piston assembly, a clamping assembly and a support plate, the cylinder body of the hydraulic cylinder assembly being fixed to the bottom of the support plate, the piston assembly being axially slidably installed in the cylinder body, the clamping assembly being installed in the piston assembly, the clamping assembly comprising a plurality of clamping rods, a return spring and a sealing ring arranged in an annular array in the piston assembly, the clamping rod being tilted and the bottom end being close to the axial hole of the piston assembly, the sealing ring being sleeved at the top end, and a return spring being sleeved below the sealing ring to realize axial elastic telescopic movement of the clamping rod in the piston assembly; the axial hole being used for free passage of a steel rope, and one end of the steel rope being connected to the support plate, and the other end being freely passed through the support plate and the axial hole downward in sequence after passing around the reversing wheel; A first oil hole is provided on one side of the top of the cylinder body, and a second oil hole is provided on one side of the bottom. When oil enters the first oil hole, the second oil hole is closed, so that the clamping rod slides axially to squeeze the steel strand. After the steel strand is clamped, oil flows out of the second oil hole, causing the piston assembly and the steel strand to move downward synchronously to lift the support plate and the poloidal field magnet located on the support plate.

[0006] Furthermore, the hydraulic cylinder assembly also includes a fixing frame, a flange sealing plate, and a flange gasket. The fixing frame is detachably fixed to the bottom of the support plate by bolts, the flange plate seals and covers both ends of the cylinder body, and the flange gasket is located between the flange sealing plate and the end face of the cylinder body.

[0007] Furthermore, the clamping rod includes a sliding table located at the top and a clamping rod coaxially fixed to the bottom end of the sliding table. The sealing ring is fixedly mounted on the circumferential surface of the sliding table. The reset spring is mounted on the clamping rod, and the top end of the reset spring is connected to the bottom end surface of the sliding table, and the bottom end is connected to the step surface of the stepped hole on the piston assembly for axial sliding installation of the clamping rod.

[0008] Furthermore, at least three clamping rods are provided. Furthermore, the bottom side of the clamping rod has a strip groove for placing the surface of the steel strand. The cross section of the strip groove is an arc shape adapted to the steel strand. The bottom of the strip groove has a plurality of ridges along its length, which are used for frictional contact with the steel strand.

[0009] Furthermore, the hydraulic lifters are arranged in groups of two, with two groups installed on each support plate, and the two groups of hydraulic lifters are started alternately.

[0010] Furthermore, the bottom end of at least one screw is threadedly fixed on the support plate, and a pressure plate is sleeved on the top end of the screw, and the pressure plate can allow the steel rope to pass freely, and the support plate and the pressure plate clamp the poloidal field magnet.

[0011] Furthermore, the first oil hole and the second oil hole are respectively connected to two oil holes of an oil tank through oil pipelines, and the oil tank has a cylindrical cavity inside which is connected to the oil hole, and the rear end of the oil tank is connected to an oil pipe coaxial with the cylindrical cavity, and a core column is coaxially and sealedly installed in the cylindrical cavity, and an oil supply hole is provided on the core column, and an end of a rotating shaft fixed to the core column exposed at the front end of the oil tank is fixed with one end of a swing arm, and the swing arm and the oil tank are hinged by a torsion spring damping, and a permanent magnet is installed at the other end of the swing arm; a first electromagnet and a second electromagnet are also provided at the front end of the oil tank, and the torsion spring makes the permanent magnet on the swing arm normally located between the two electromagnets, and when the two electromagnets are energized separately, the permanent magnet is attracted to make the core column rotate synchronously with the swing arm, and when the permanent magnet is in contact and fixed with the corresponding electromagnet, the first oil hole or the second oil hole is aligned and connected with the oil supply hole.

[0012] Furthermore, when the first oil hole is connected to the oil supply hole, the permanent magnet is attracted and contacted with the second electromagnet; a three-way joint is installed on the second oil hole, one port of the three-way joint is used to connect with the oil supply hole, and the other port is connected to the return oil pipeline through a solenoid valve; the swing arm is connected to a sub-arm through an arc compression spring, and the end of the sub-arm away from the arc compression spring is sleeved on the outside of the core column and rotatably connected to the swing arm; a third electromagnet is also provided at the front end of the oil tank, and a permanent magnet is fixed on one side of the end of the sub-arm, and a valve switch for controlling the solenoid valve is provided on the permanent magnet; the sub-arm can rotate with the swing arm under the action of the arc compression spring; when the permanent magnet is attracted and connected to the second electromagnet and the second electromagnet is de-energized, the third electromagnet is energized to attract and connect the permanent magnet, and at this time, the thrust of the arc compression spring on the swing arm causes the permanent magnet to continue to maintain contact with the second electromagnet after the power is cut off.

[0013] At the same time, the present invention also provides a method for lifting the poloidal field magnets at the bottom of a fusion reactor into position, which uses the aforementioned device for lifting the poloidal field magnets at the bottom of a fusion reactor to perform lifting. The specific operating steps include: The hydraulic hoists are divided into at least a first group and a second group, and the hydraulic hoists are arranged around the poloidal field magnet; a steel rope is fixed, with one end of the steel rope fixed to the support plate and the other end passing through the axial hole of the support plate and the piston assembly after passing through the reversing wheel; the first group of hydraulic hoists is controlled to work to lift the poloidal field magnet to a stroke height and temporarily maintain the oil supply state to ensure that the steel rope is clamped; the second group of hydraulic hoists is controlled to work to continue lifting the poloidal field magnet and temporarily maintain the oil supply state; the first group of hydraulic hoists is controlled to reset, and the corresponding steel rope naturally droops, and the two groups of hoists continue to work alternately; The poloidal field magnet is lifted to a predetermined height and contacts the already-placed toroidal field magnet, keeping the two sets of hydraulic hoists in the working state of clamping the steel strands; some fixing bolts related to the poloidal field magnet are installed to ensure that the poloidal field magnet is in a stable state; finally, the hydraulic hoists are removed and the remaining bolts are installed.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The structure of the present invention is a set of hydraulic fully automatic lifting equipment with simple structure and compact size, which is suitable for lifting and installing components of compact fusion reactors.

[0015] 2. The hydraulic lifter of the present invention has a sophisticated structure and contains a clamping assembly and a piston assembly. The clamping assembly consists of two left and right clamping rods with wedge structures and a return spring. When the steel rope is clamped, the piston assembly moves, driving the poloidal field magnet to move upward.

[0016] 3. The lifting method of the present invention is simple to operate and has higher efficiency through automatic control, which reduces manual work during the lifting process.

[0017] 4. The principle of controlling the hydraulic hoist of the present invention is to divide the hydraulic hoist into two groups. The two groups of hydraulic hoists work alternately. When one group is working, the other group continuously clamps the steel rope. The dual redundant program prevents the magnet from falling and ensures construction safety.

[0018] 5. The present invention is generally applicable to poloidal field magnets of different sizes and weights. The number of hoists can be increased or decreased according to the load. It is not limited to use in fusion reactors and can be applied to the lifting and installation of large workpieces in various working conditions.

[0019] As for other positive effects, advantages, and optimized technical features of the present invention, they will be illustrated through detailed elaboration of subsequent specific embodiments. Some technical features still require general technicians in this field to fully study and practice the present invention in order to be better understood and applied. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a simplified structural diagram of the present invention when lifting the poloidal field magnet at the bottom of a fusion reactor; Figure 2 This is a cross-sectional view of the hydraulic hoist clamping the steel rope; Figure 3 is a cross-sectional view of a hydraulic cylinder assembly; Figure 4 is a cross-sectional view of the piston assembly; Figure 5 Schematic diagram of a circular array of clamping rods; Figure 6 is a schematic diagram of several hydraulic cylinder assemblies installed on a support plate; Figure 7 This is the initial structural diagram of the oil supply structure with two oil holes; Figure 8 Schematic diagram of the oil supply structure when hydraulic oil is input into the first oil hole (when the steel strand is clamped); Figure 9 Schematic diagram of the oil supply structure when oil is continuously input to the first oil hole and oil is output from the second oil hole through the solenoid valve (when the steel strand is clamped and pulled downward); Figure 10 It is a cross-sectional view of the connection structure between the rotating shaft at the end of the core column and the swing arm and auxiliary arm.

[0021] Among them, the fixing frame 1, the flange sealing plate 2, the flange gasket 3, the cylinder body 4, the first oil hole 5, the guide part 6, the sealing ring 7, the sliding table 8, the return spring 9, the clamping rod 10, the steel rope 11, the hydraulic cylinder assembly 12, the clamping rod 13, the piston assembly 14, the support plate 15, the first group of hydraulic hoists 16, the second group of hydraulic hoists 17, the screw 18, the poloidal field magnet 19, the pressure plate 20, the second oil hole 21, the oil tank 22, the oil hole 23, the oil supply hole 24, the swing arm 25, the permanent magnet 26, the second electromagnet 27, the first electromagnet 28, the core column 29, the rotating shaft 30, the torsion spring 31, the auxiliary arm 32, the arc compression spring 33, the permanent magnet 34, the third electromagnet 35, the three-way joint 36, the oil return line 37, and the solenoid valve 38. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the principles of the present invention will be explained in depth herein with reference to the accompanying drawings and at least one detailed embodiment. Those skilled in the art should be aware that the specific embodiments described below are merely intended to illustrate the technical principles of the present invention and are not intended to limit the present invention to only such embodiments.

[0023] As a specific embodiment of the present invention, a device for lifting the poloidal field magnet at the bottom of a fusion reactor is described in detail. Figure 1 As shown, this lifting and positioning equipment mainly includes several hydraulic hoists that are started alternately. Specifically, Figure 2-Figure 4These hydraulic lifts all include a hydraulic cylinder assembly 12, a piston assembly 14, a clamping assembly, and a support plate 15. The cylinder body 4 of the hydraulic cylinder assembly 12 is fixed to the bottom of the support plate 15, achieving a fixed installation of the hydraulic lift. The piston assembly 14 is axially slidably mounted within the cylinder body 4. Specifically, cylindrical guide portions 6 may be integrally formed at each end of the piston assembly 14, with the upper and lower regions of the piston assembly 14 forming two independent oil storage areas. The clamping assembly is mounted within the piston assembly 14. For example, the clamping assembly includes a plurality of clamping rods 13, a return spring 9, and a sealing ring arranged in an annular array within the piston assembly 14. Each clamping rod 13 is provided with a sealing ring and a return spring 9, so that the clamping rod 13 is tilted and the bottom end of the clamping rod 13 approaches the axial hole of the piston assembly 14, forming a clamping tendency. A sealing ring is mounted at the top of the clamping rod 13, and a return spring 9 is mounted below the sealing ring on the clamping rod 13 to achieve axial elastic telescopic movement of the clamping rod 13 within the piston assembly 14. In addition, in particular, the axial hole of the piston assembly 14 is used for the free passage of the steel strand 11, that is, the steel strand can move freely in the axial hole, and one end of the steel strand 11 is connected to the support plate 15, while the other end passes around the reversing wheel and freely passes through the support plate 15 and the axial hole of the piston assembly 14 downward in turn, and the reversing wheel can be adaptively installed somewhere above the installation position of the poloidal field magnet 19 to form a fulcrum for the steel strand.

[0024] In addition, in this embodiment, Figure 2-Figure 3 , it is also necessary to provide a first oil hole 5 on the top side of the cylinder body 4 and a second oil hole 21 on the bottom side. In use, when oil is supplied to the first oil hole 5, the second oil hole 21 is in a closed state. At this time, the oil inside the cylinder body 4 in the lower area of ​​the piston assembly 14 is sealed, and the oil supply from the first oil hole 5 will push the clamping rods 13 to move axially, but the piston assembly 14 will not move axially downward, so that the clamping rods 13 can slide axially to squeeze the steel strand 11, thereby grasping or clamping the steel strand 11, and after clamping the steel strand 11, oil flows out of the second oil hole 21, causing the piston assembly 14 to move downward with the steel strand 11, that is, pulling the steel strand 11 downward, so that the other section of the steel strand 11 connected to the support plate 15 can move upward, and then the support plate 15 and the poloidal field magnet 19 located on the support plate 15 can be lifted, and the poloidal field magnet 19 can be lifted step by step into place, which is very clever.

[0025] In practice, such as Figure 3The hydraulic cylinder assembly 12 of this embodiment further includes a fixing frame 1, a flange sealing plate 2, and a flange gasket 3. The fixing frame 1 is removably fixed to the bottom of the support plate 15 by bolts. The fixing frame 1 can be a single plate member to facilitate its close fit with the support plate 15. The flange plates sealably cover both ends of the cylinder body 4. The flange gasket 3 is located between the flange sealing plate 2 and the end surface of the cylinder body 4, providing a sealed installation for the cylinder body 4.

[0026] like Figure 5 As shown, the clamping rod 13 includes a sliding table 8 at the top and a clamping rod 10 coaxially fixed to the bottom end of the sliding table 8. A sealing ring is fixedly mounted on the circumferential surface of the sliding table 8. A return spring 9 is mounted on the clamping rod 10. The top end of the return spring 9 is connected to the bottom end surface of the sliding table 8, and the bottom end is connected to the stepped surface of the stepped hole on the piston assembly 14 for the axial sliding installation of the clamping rod 13. Therefore, elastic telescopic movement is achieved under hydraulic drive. That is, when the hydraulic pressure decreases or disappears, the clamping rod 13 can retract and release the steel strand 11. In order to effectively clamp the steel strand 11, the present clamping rod 13 is provided with at least three. In addition, in this embodiment, a strip groove is provided on the side surface of the bottom end of the clamping rod 10, that is, the side facing the steel strand 11, for placing the surface of the steel strand 11. The cross-section of this strip groove is an arc shape adapted to the steel strand 11, and the bottom of the strip groove is provided with a number of ridges along its length direction. The ridges are used for frictional contact with the steel strand 11 to enhance the gripping force.

[0027] In this embodiment, to provide greater stability for each support plate 15, hydraulic lifters are arranged in pairs. Even if one hydraulic lifter in each group fails, the other can still take over the lifting function. Specifically, two hydraulic lifters are installed on each support plate 15, and the two hydraulic lifters are activated alternately to achieve intermittent lifting of the support plate 15 and the poloidal field magnet 19.

[0028] In order to more securely lift the poloidal field magnet 19, Figure 1 and Figure 6 As shown, the bottom end of at least one screw rod 18 is fixed to the support plate 15 by a plurality of nuts, and a pressing plate 20 is sleeved on the top end of the screw rod 18. Figure 1 For ease of illustration, the pressure plate 20 is partially disconnected from the screw rod 18, and the corresponding nut is not tightened in place. The pressure plate 20 allows the steel strand 11 to pass freely through it, namely, corresponding circular holes are provided in the pressure plate 20 for the free passage of the steel strand 11. When installed, the support plate 15 and the pressure plate 20 clamp the poloidal field magnet 19. During operation, tightening the corresponding nut on the screw rod 18 secures the pressure plate 20, the poloidal field magnet 19, and the support plate 15 together.

[0029] As an example of specific implementation details, in this embodiment, Figure 7The first oil hole 5 and the second oil hole 21 are connected to two oil holes 23 of an oil tank 22 through oil pipelines. The oil tank 22 has a cylindrical cavity inside that is connected to the oil holes 23. The rear end of the oil tank 22 is connected to an oil pipe coaxial with the cylindrical cavity. A core column 29 is coaxially and rotatably installed in the cylindrical cavity. An oil supply hole 24 is provided on the core column 29. These oil supply holes 24 are intended to be aligned and connected with the corresponding oil holes 23 during use, thereby conducting the corresponding oil circuit. Figure 7 、 Figure 10 As shown, the end of the core column 29 is fixed with a rotating shaft 30, which is exposed at the front end of the oil tank 22. One end of a swing arm 25 is fixed to it, and the swing arm 25 is hinged to the end surface of the oil tank 22 via a torsion spring 31. The torsion spring 31 can be installed adaptively. The purpose is to provide resistance when the swing arm is rotated by an external force after the torsion spring 31 is connected. When the external force disappears, the swing arm and the core column can be quickly reset. In addition, a permanent magnet 26 must be installed at the other end of the swing arm 25. Accordingly, based on the above structural design, as shown in FIG. Figure 7 , it is necessary to provide a first electromagnet 28 and a second electromagnet 27 at the front end of the oil tank 22. The torsion spring 31 ensures that the permanent magnet 26 on the swing arm 25 is normally located between the two electromagnets. When the two electromagnets are energized separately, they attract the permanent magnet 26 and make the core column 29 rotate or swing synchronously with the swing arm 25. When one of the electromagnets is energized, the permanent magnet 26 contacts and is fixed to the corresponding electromagnet. At this time, the first oil hole 5 or the second oil hole 21 is aligned and connected with the oil supply hole 24, and the corresponding oil circuit is opened.

[0030] Specifically, in this embodiment, Figure 8When the permanent magnet 26 and the second electromagnet 27 are in contact with each other, the first oil hole 5 communicates with the oil supply hole 24. A three-way connector 36 is mounted on the second oil hole 21. One end of the three-way connector 36 is connected to the oil supply hole 24, and the other end is connected to the oil return line 37 via a solenoid valve 38. The swing arm 25 is connected to a secondary arm 32 via an arc-shaped compression spring 33. The end of the secondary arm 32, away from the arc-shaped compression spring 33, is sleeved outside the core column 29 and is rotatably connected to the swing arm 25. A third electromagnet 35 is also mounted at the front end of the oil reservoir 22. A permanent magnet 34 is fixed to one end of the secondary arm 32. A valve switch (not shown) that controls the solenoid valve 38 is mounted on the permanent magnet 34. When this valve switch is pressed, the other end of the three-way connector 36 outputs hydraulic oil to the oil return line 37, discharging the hydraulic oil from the cylinder 4 below the piston assembly 14, allowing the piston assembly 14 to move downward with the strand. The auxiliary arm 32 of this embodiment can rotate together with the swing arm 25 under the action of the arc-shaped compression spring 33, that is, the arc-shaped compression spring 33 connects the swing arm 25 and the auxiliary arm 32 into one body. When the permanent magnet 26 and the second electromagnet 27 are already adsorbed and connected, when the second electromagnet 27 is powered off, there is no magnetic attraction between the permanent magnet 26 and the second electromagnet 27. However, when the third electromagnet 35 is energized, it can attract the permanent magnet 34, that is, the auxiliary arm 32 moves closer to the third electromagnet 35 until the third electromagnet 35 is attracted and connected to the permanent magnet 34. At this time, the thrust of the arc-shaped compression spring 33 on the swing arm 25 causes the permanent magnet 26 to continue to maintain contact with the second electromagnet 27 after power is cut off, and maintain the state of supplying oil to the first oil hole 5. Therefore, although the second electromagnet 27 has been powered off and cannot attract the fixed permanent magnet 26, due to the action of the arc-shaped compression spring 33, the two still maintain a stable contact relationship, that is, maintain the state of supplying oil to the first oil hole 5, so that when the second oil hole 21 discharges oil outward, the piston assembly 14 moves further downward with the steel strand.

[0031] The above design structure is mainly used to switch the driving oil circuit of the hydraulic hoist to better realize the hydraulically driven lifting method of the present invention. By following the actions of the above series of structural elements, the hydraulic hoist automatically grabs the steel strand 11 and climbs upward with the poloidal field magnet. After climbing to a certain height, it automatically releases and loosens the steel strand 11 so that the next group of hydraulic hoists can perform the same actions mentioned above. The two groups of hydraulic hoists work alternately to lift the poloidal field magnet to the final position.

[0032] Based on the above embodiment, as another embodiment, a method for lifting the poloidal field magnet at the bottom of a fusion reactor is introduced. This method uses the device for lifting the poloidal field magnet 19 at the bottom of a fusion reactor in the above embodiment to lift the poloidal field magnet 19. The specific operation steps include: Figure 6The hydraulic lifters are divided into at least a first group and a second group. Multiple sets of these first and second groups of hydraulic lifters 17 can be installed around the poloidal field magnet 19 as needed. The steel rope 11 is then secured. One end of the steel rope 11 is fixed to the support plate 15, and the other end passes through a reversing wheel above and downward through the support plate 15 and the axial hole of the piston assembly 14. During operation, the first group of hydraulic hoists 16 are controlled to work, the poloidal field magnet 19 is lifted to a stroke height, and the oil supply state is temporarily maintained to ensure that the steel strand 11 is clamped. Then the second group of hydraulic hoists 17 are controlled to work, and the poloidal field magnet 19 is continued to be lifted, and the oil supply state is temporarily maintained. During this period, the steel strand 11 on the first group of hydraulic hoists 16 will be released from the original taut tension state, and even bend freely, so that the first group of hydraulic hoists 16 are controlled to reset, that is, the clamping rod 13 in the first group of hydraulic hoists 16 is allowed to release the steel strand 11, so that the steel strand 11 will droop naturally. Then, when the clamping rod 13 in the first group of hydraulic hoists 16 clamps the corresponding steel strand 11 in the naturally drooping state again, the above steps are repeated, and the support plate 15 and the poloidal field magnet 19 are moved up to a height again. In this way, the two groups of hoists work alternately to lift the poloidal field magnet 19 into place. When the poloidal field magnet 19 is lifted to a predetermined height, it can contact the toroidal field magnet that has been in place, keeping the two sets of hydraulic hoists in the working state of clamping the steel strand 11 to maintain the stability of the position of the poloidal field magnet 19 at this time. Subsequently, some fixing bolts related to the poloidal field magnet 19 are installed to ensure that the poloidal field magnet 19 can still be in a stable state after the hydraulic hoist is removed, that is, it is securely connected to the toroidal field magnet that has been installed in place. Finally, the hydraulic hoist is removed, the remaining bolts are installed, and the poloidal field magnet 19 is completely installed and fixed.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. The detailed description of the embodiments of the present application and the specific examples used in them have been used to discuss the technical principles and implementation methods of the present application in detail. They are only used to help those skilled in the art to fully and deeply understand the design concept of the present application and should not be understood as the only or selective limitation on the technical principles of the present application. As for the detailed description of the present invention by the preferred embodiments mentioned in this application, ordinary technicians in this field should be able to make simple modifications to the technical solutions of the present invention or make equivalent replacements of the means based on these preferred embodiments, but their core technical principles should be covered by the scope of protection embodied in the claims of the present invention without departing from the technical ideas, design purposes and scope of application of the present invention.

Claims

1. A device for lifting the poloidal field magnets at the bottom of a fusion reactor into position, comprising a plurality of hydraulic lifts that are activated alternately, characterized in that: The hydraulic lift comprises a hydraulic cylinder assembly (12), a piston assembly (14), a clamping assembly and a support plate (15), wherein the cylinder body (4) of the hydraulic cylinder assembly (12) is fixed to the bottom of the support plate (15), the piston assembly (14) is axially slidably installed in the cylinder body (4), the clamping assembly is installed in the piston assembly (14), the clamping assembly comprises a plurality of clamping rods (13) arranged in an annular array in the piston assembly (14), a return spring (9) and a sealing ring, the clamping rod (13) is tilted and the bottom end is close to the axial hole of the piston assembly (14), the sealing ring is sleeved at the top end, and the return spring (9) is sleeved below the sealing ring to realize the axial elastic telescopic movement of the clamping rod (13) in the piston assembly (14); the axial hole is used for allowing the steel rope (11) to pass freely, and one end of the steel rope (11) is connected to the support plate (15), and the other end passes through the reversing wheel and freely passes through the support plate (15) and the axial hole downward in sequence; A first oil hole (5) is provided on one side of the top of the cylinder body (4), and a second oil hole (21) is provided on one side of the bottom. When oil enters the first oil hole (5), the second oil hole (21) is closed, so that the clamping rod (13) slides axially to squeeze the steel strand (11). After the steel strand (11) is clamped, oil flows out of the second oil hole (21), so that the piston assembly (14) and the steel strand (11) move downward synchronously, so as to lift the support plate (15) and the poloidal field magnet (19) located on the support plate (15).

2. The device for lifting the poloidal field magnet at the bottom of a fusion reactor according to claim 1, characterized in that: The hydraulic cylinder assembly (12) further comprises a fixing frame (1), a flange sealing plate (2), and a flange gasket (3); the fixing frame (1) is detachably fixed to the bottom of the support plate (15) by bolts; the flange plate seals and covers both ends of the cylinder body (4); and the flange gasket (3) is located between the flange sealing plate (2) and the end face of the cylinder body (4).

3. The device for lifting the poloidal field magnet at the bottom of a fusion reactor according to claim 1, characterized in that: The clamping rod (13) includes a sliding table (8) at the top and a clamping rod (10) coaxially fixed to the bottom end of the sliding table (8), the sealing ring is fixedly sleeved on the circumferential surface of the sliding table (8), the reset spring (9) is sleeved on the clamping rod (10), and the top end of the reset spring (9) is connected to the bottom end surface of the sliding table (8), and the bottom end is connected to the step surface of the stepped hole on the piston assembly (14) for axial sliding installation of the clamping rod (13).

4. The device for lifting the poloidal field magnet at the bottom of a fusion reactor according to claim 3, characterized in that: At least three clamping rods (13) are provided.

5. The device for lifting the poloidal field magnet at the bottom of a fusion reactor according to claim 3, characterized in that: The bottom side of the clamping rod (10) has a strip groove for placing the surface of the steel strand (11), and the cross section of the strip groove is an arc shape adapted to the steel strand (11); the bottom of the strip groove is provided with a plurality of ridges along its length direction, and the ridges are used for frictional contact with the steel strand (11).

6. The device for lifting the poloidal field magnet at the bottom of a fusion reactor according to claim 1, characterized in that: The hydraulic lifters are arranged in groups of two, with two groups installed on each support plate (15), and the two groups of hydraulic lifters are started alternately.

7. The device for lifting the poloidal field magnet at the bottom of a fusion reactor according to claim 1, characterized in that: The bottom end of at least one screw rod (18) is threadedly fixed on the support plate (15), and a pressure plate (20) is sleeved on the top end of the screw rod (18). The pressure plate (20) can allow the steel rope (11) to pass freely, and the support plate (15) and the pressure plate (20) clamp the poloidal field magnet (19).

8. The device for lifting the poloidal field magnet at the bottom of a fusion reactor according to claim 1, characterized in that: The first oil hole (5) and the second oil hole (21) are respectively connected to two oil holes (23) of an oil tank (22) through oil pipelines. The oil tank (22) has a cylindrical cavity in communication with the oil hole (23). The rear end of the oil tank (22) is connected to an oil pipe coaxial with the cylindrical cavity. A core column (29) is coaxially and rotatably installed in the cylindrical cavity. The core column (29) is provided with an oil supply hole (24). One end of a swing arm (25) is fixed to a rotating shaft (30) of the core column (29) exposed from the front end of the oil tank (22). The swing arm (25) and the oil tank (22) are hingedly connected by a torsion spring (31) for damping. The other end of the swing arm (25) is provided with a permanent magnet (26). A first electromagnet (28) and a second electromagnet (27) are also provided at the front end of the oil bin (22). The torsion spring (31) causes the permanent magnet (26) on the swing arm (25) to be located between the two electromagnets under normal conditions. When the two electromagnets are energized separately, the permanent magnet (26) is attracted to cause the core column (29) to rotate synchronously with the swing arm (25). When the permanent magnet (26) is in contact and fixed with the corresponding electromagnet, the first oil hole (5) or the second oil hole (21) is aligned and connected with the oil supply hole (24).

9. The device for lifting the poloidal field magnet at the bottom of a fusion reactor according to claim 8, characterized in that: When the permanent magnet (26) and the second electromagnet (27) are in adsorption contact, the first oil hole (5) is connected to the oil supply hole (24); a three-way joint (36) is installed on the second oil hole (21), one port of the three-way joint (36) is used to communicate with the oil supply hole (24), and the other port is connected to the oil return line (37) through a solenoid valve (38); the swing arm (25) is connected to a subsidiary arm (32) through an arc-shaped compression spring (33), and the end of the subsidiary arm (32) away from the arc-shaped compression spring (33) is sleeved on the outside of the core column (29) and is rotatably connected to the swing arm (25); the front end of the oil tank (22) is also provided with a third electromagnet (35), and the subsidiary arm (32) A permanent magnet (34) is fixed to one side of the end of the electromagnetic valve (37), and a valve switch for controlling the electromagnetic valve (37) is provided on the permanent magnet (34); the auxiliary arm (32) can rotate together with the swing arm (25) under the action of the arc-shaped compression spring (33); when the permanent magnet (26) is adsorbed and connected with the second electromagnet (27) and the second electromagnet (27) is powered off, the third electromagnet (35) is powered on to attract the permanent magnet (34), press the valve switch so that the other port of the three-way connector (36) outputs hydraulic oil, and at this time, the thrust of the arc-shaped compression spring (33) on the swing arm (25) causes the permanent magnet (26) to continue to maintain a contact state with the second electromagnet (27) after the power is turned off.

10. A method for lifting the poloidal field magnet at the bottom of a fusion reactor into position, characterized in that: The lifting is performed using the device for lifting the poloidal field magnet at the bottom of a fusion reactor as described in any one of claims 1 to 9, and the specific operation steps include: S1, dividing the hydraulic lifts into at least a first group and a second group, wherein all the hydraulic lifts are surrounded by a poloidal field magnet (19); S2. Install the steel strand (11), one end of which is fixed to the support plate (15), and the other end of which passes through the axial hole of the support plate (15) and the piston assembly (14) after passing around the reversing wheel; S3, controlling the first group of hydraulic hoists (16) to work, lifting the poloidal field magnet (19) to a stroke height, and temporarily maintaining the oil supply state to ensure that the steel strand (11) is in a clamped state; S4, controlling the second hydraulic lifter (17) to work, continuing to lift the poloidal field magnet (19), and temporarily maintaining the oil supply state; S5, control the first set of hydraulic hoists (16) to reset, and the corresponding steel rope (11) naturally droops, and the two sets of hydraulic hoists continue to work alternately; S6, the poloidal field magnet (19) is lifted to a predetermined height and contacts the already positioned toroidal field magnet, keeping the two sets of hydraulic hoists in a working state of clamping the steel strand (11); S7. Install some fixing bolts between the poloidal field magnet (19) and the toroidal field magnet to ensure that the poloidal field magnet (19) is in a stable state temporarily connected to the toroidal field magnet. Finally, remove the hydraulic lifter and install the remaining bolts to completely fix the poloidal field magnet (19) on the toroidal field magnet.

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