80results about How to "Large suspension force" patented technology

The invention provides a continuous suspension type directional solidification casting device of a cold crucible. Heat-resisting lightweight titanium-aluminum alloy vanes are badly needed in transportation and energy industries, and a traditional directional solidification device causes severe impurity pollution and damages plasticity and toughness of the vanes. The directional solidification casting device aims at improving the efficiency of the directional solidification device of the cold crucible and overcomes the shortcoming that the existing casting device cannot be used for casting vanes with complex shape. A trapezoid boss is annularly arranged on the inner wall of the water cooling copper crucible, an induction coil is wound around the outer portion of the crucible, the boss is placed in the coil, an excited alternating current magnetic field is diffused inwards through crucible gaps to generate a hot area to achieve suspension rod liquid feeding of material rods. The device further comprises a drawing-pulling rod in a crystallizer, a mould casing with cross section being vane-shaped is fixed on the upper end face of the drawing-pulling rod, and the mould casing is heated by an outer induction graphite sleeve. The continuous suspension type directional solidification casting device achieves suspension melting liquid feeding, sequential filling and directional solidification of metal liquid, avoids chemical reaction of a titanium-aluminum alloy melt body and the mould casing and improves directional solidification processing efficiency of titanium-aluminum alloy.

The invention discloses a permanent magnetic suspension locomotive system integrating suspending, guiding, pushing and braking. The corresponding suspending, guiding, pushing and braking functions are achieved through interaction between a suspending system, a guiding system, a pushing system and a braking system of the permanent magnetic suspension locomotive system and permanent magnet rails (2) arranged on railway sleepers or steel cushion blocks (1). The suspending system comprises the permanent magnet rails (2) and vehicle-mounted permanent magnet bars (3) arranged at the bottom of a train (5). The guiding system comprises the permanent magnet rails (2) and a plurality of guide wheels (4) arranged on the two sides of the bottom of the train (5). The pushing system and the braking system comprise the permanent magnet rails (2) and a plurality of power discs (6), wherein the power discs (6) are arranged at the bottom of the train (5). The permanent magnetic suspension locomotive system is low in operation energy consumption, stable in suspension, high in engineering implementation reliability, and low in construction difficulty, and orbital transfer, operation and control are easy. An existing railway and metro rails can be installed and operated after being simply transformed.

The invention relates to an external rotor radial-axial three degrees of freedom hybrid magnetic bearing, wherein axial stators adopt dual-piece type hexad-pole structures, and each piece consists of three magnetic poles of the axial stators evenly distributed on the circumference; radial stators with the three magnetic poles evenly distributed on the circumference are positioned between two pieces of the axial stators; three blocks of permanent magnets have blocky circular shapes and are charged with magnetism in the radial direction, and the three blocks of the permanent magnets are embedded in circular grooves on the outer sides of the magnetic poles of the radial stators and provide radial and axial biasing magnetic fluxes simultaneously; an axial air gap is formed between the axial stators and a rotor, and a radial air gap is formed between the radial stators and the rotor; axial control coils are close to the axial stators and are placed in the inner sides of the axial stators to provide axial control current by a direct current linear power amplifier; and three radial control coils are wound on three magnetic poles of three radial stators to perform drive control by a three-phase alternating current power inverter. The external rotor radial-axial three degrees of freedom hybrid magnetic bearing greatly reduces the volume of the magnetic bearing, obviously reduces the power consumption, and is applicable to electric principal axis and rotary principal axis systems needing suspending support.

The invention discloses a control method of suspension force of a normal conducting magnetic-levitation train. The method comprises following steps: obtaining travelling speed, travelling direction, suspension gap and acceleration information of a normal conducting magnetic-levitation train; obtaining decrement [delta] F of corresponding suspension force according to the travelling speed and the travelling direction; obtaining increment [delta] i of corresponding current according to the decrement [delta] F of suspension force; obtaining corresponding given current i* according to the suspension gap and the acceleration; superposing the given current i* and the current increment [delta] i to obtain rectified given current I; operating the rectified given current I to obtain corresponding real control current i; outputting the real control current i to the coil of the suspension electromagnet. The above method can compensate the influence of track eddy current on control performance of a suspension system of a normal conducting magnetic-levitation train. In addition, the invention also discloses a control system of suspension force of a normal conducting magnetic-levitation train and a suspension controller.

The invention discloses a non-contact handling device and relates to a handling device. The device comprises a cover body with a cylindrical inner hole, gyratory fan blades arranged in the cover body and a power input shaft for driving the gyratory fan blades to rotate, wherein the central position of the top end of the cover body is provided with a power input shaft mounting hole and air sucking ports distributed on the periphery of the power input shaft mounting hole; each gyratory fan blade consists of a shaft sleeve and blades distributed on the shaft sleeve; the lower parts of the blades are vertical, the upper parts are bent, and the bending directions of the blades are consistent with the rotation directions of the gyratory fan blades; and one end of the power input shaft passes through the power input shaft mounting hole and is connected with the shaft sleeve of the gyratory fan blades in the cover body, while the other end is connected with a rotary drive device arranged outside the cover body. The device has the characteristics of low energy consumption and strong suspension force, can be driven by adopting a motor, has the advantages of low cost, wide application range, large motion range, and the like, conforms to the development trends of energy saving and high efficiency in the semiconductor industry at present and is easy to popularize and apply.

The invention relates to a maglev traction device of a high-temperature superconducting high-speed maglev train, and belongs to the technical field of intelligent devices. The traction device comprises a high-temperature superconducting maglev device and a traction power device; the high-temperature superconducting magnetic levitation device comprises vehicle body rail holding frames installed onthe left side and the right side of a vehicle body bogie, magnetic conductive rails installed on ground rails on the left side and the right side, a feedback control system, an air gap position detection controller, high-temperature superconducting electromagnets and guide electromagnets, wherein the high-temperature superconducting electromagnets and the guide electromagnets are installed on thevehicle body rail holding frames respectively. The traction power device comprises an iron-core-free long-stator permanent magnet synchronous linear motor which comprises two stators, two rotors and two installation supports. Each stator is vertically installed in the center of a ground track, and each rotor is vertically installed between the two sides of the two stators and installed on a bogieof a vehicle body. The problems of large coil volume and weight, serious heating and easy insulation aging in a traditional magnetic suspension structure are avoided, and the structure of a magnetic suspension system is simplified.

The invention relates to a maglev bogie. The maglev bogie comprises an upper framework, two lower frameworks, levitation devices and track sensing devices, wherein the upper framework is positioned atthe upper part, and the two lower frameworks are positioned at the lower parts; the upper framework is connected with the lower frameworks through connecting devices in a hinged manner; the levitation devices are correspondingly mounted at the bottoms of the two sides of the lower frameworks; and the track sensing devices are mounted on the bottom surfaces of the middle parts of the lower frameworks. According to the maglev bogie, basic functions of maglev vehicle levitation driving and guiding functions are integrated; by using bearing hinging structures to connect the upper framework with the lower framework, a single steering mechanism does not need to be specially arranged; and therefore, the structure is simplified while multiple functions are realized; as the maglev bogie is prone to being manufactured by using a lightweight material, the weight of a superconducting maglev vehicle running mechanism can be effectively reduced; and as a low temperature liquid filling system is generally placed on the ground under the vehicle, the maglev bogie is beneficial for mounting more low temperature filling containers in the running mechanism and the bogie to fill more low temperature liquids, and therefore, a greater levitation force is realized. The invention further relates to a maglev train.

The invention discloses a bearingless brushless direct current motor and a control method thereof. The motor is characterized in that: a permanent magnet is uniformly distributed on a surface of a rotor iron core with a Halbach array; both a torque winding and a suspension force winding employ a short pitch winding structure and are wound round a stator tooth together; coils of each two suspension force windings are separated by a stator tooth; through a difference between a given rotating speed and an actual rotating speed and through a PI regulator, a current given value of the torque winding is outputted to control torque winding input current, and rotating speed closed loop control is realized; through a difference between a given rotor radial displacement and a detected actual displacement and through the PI regulator, a suspension force given value is outputted to control suspension force winding input current, and rotor radial displacement closed loop control is realized. By employing the method in the invention, effective control of bearingless brushless direct current motor torque and suspension force are realized, permanent magnetism material is saved, and a motor weight is reduced.

The invention discloses a gravity compensator with low rigidity and large suspension force. A stator part comprises a stator inner ring permanent magnet, a coil and a stator outer ring permanent magnet; a mover part comprises a mover inner ring permanent magnet and a mover outer ring permanent magnet, the stator inner ring permanent magnet, the mover inner ring permanent magnet, the coil, the mover outer ring permanent magnet and the stator outer ring permanent magnet are sequentially arranged from inside to outside, gaps are formed between them, and the stator part and the mover part interactto generate suspension force. The inner ring and the outer ring of the stator respectively comprise three layers of permanent magnets in the axial direction such that the magnetic field intensity isincreased, and the suspension force generated by the gravity compensator is large; meanwhile, the magnetizing directions of an upper layer and a lower layer of the three layers of permanent magnets are opposite such that the magnetic field is more uniform, the suspension force is close to linearity, the suspension rigidity is reduced, the gravity of a load can be effectively compensated, the positioning of the bearing platform is realized, and the influence of internal and external disturbance sources on the load is reduced.

A short cooling crucible used for billet continuous melting and directional solidification relates to a cooling crucible. The invention solves the problems of a present electromagnetic cooling crucible, including adhesion between a melt and an inner wall of the crucible, discontinuous melt melting, poor melt melting, uneven composition, low power utilization and inconvenient observation. The cross section of a red copper crucible main body (1) mentioned by the invention is a flat annular hollow cavity. The upper half body (2) is segmented into eight columns (7), of which the cross sections are petal shape. Vertical deep holes are arranged on the bottom face of the lower half body (3), corresponding to the position of the columns (7) with petal-shaped cross sections. Clearances (8) are arranged between every two adjacent columns (7) with petal-shaped cross sections. The clearances (8) are filed with insulating seal material layers (12). The invention makes the low cost melting and forming with high purified materials realized. Metals float in a water cooling copper crucible and are in soft contact with the inner wall of the crucible. The strong stirring of the electromagnetic powermakes the melt components even.

The invention discloses a linear induction repulsion buoyancy motor comprising a mover core, a stator base, a stator winding, a suspended permanent-magnet and an excitation winding. The stator winding is arranged at the upper end of the stator base and drives the mover core to rotate; the suspended permanent-magnet and the excitation winding are arranged oppositely, wherein, the suspended permanent-magnet is arranged on a mover; the excitation winding is arranged on the stator base; the suspended permanent-magnet is an array permanent-magnet that is arranged horizontally and vertically; and the magnetic density of the suspended permanent-magnet on the side opposite to a magnetic winding is stronger than that of the other side of the permanent-magnet. In the linear induction repulsion buoyancy motor, the Halbach array permanent-magnet is installed on the mover, the repulsion buoyancy is formed by the array permanent-magnet and the excitation winding on the stator base during the moving process, so the mover suspends with no contact and no friction, and can run at a high speed under the action of traction force. By adopting a unilateral primary linear induction motor, the invention solves the problem that a moving part is not easy to supply the electrical source in magnetic suspension launch.

The invention discloses a permanent-magnet suspension train using a magnetic suspension energy storage flywheel as power, which comprises a rail, a train body, an energy storage flywheel, a control system and a stop. The rail and the train body are respectively provided with a main suspension magnet, an auxiliary suspension magnet and a guiding suspension magnet made from rare-earth permanent magnet materials of neodymium iron boron; the train body is also provided with the energy storage flywheel which can convert electrical energy into mechanical energy to store and convert the mechanical energy into the electrical energy, so as to provide the electrical energy required when the train runs and a vacuum machine set works, and the like; the energy storage flywheel is supported by a magnetic suspension bearing, and a shell of the energy storage flywheel is connected with the vacuum machine set through a vacuum valve; and the vehicle body and the rail are respectively provided with a coil of a linear magnetoelectric machine and a magnet stator of an electric motor. A transmission system has a simple structure, is easy to manufacture and maintain, and saves energy, so that the train runs more stably, has low vibration and low noise, and can not affect normal life of people when passing through a residential area.

The invention provides a constant conduction rotating magnetic field electric magnetic levitation system, the system is mainly composed of two parts: a primary formed by a radially slotted annular iron core and a copper coil winding placed in the slot; a smooth flat aluminum or copper conductor plate secondary. Place the copper coil winding symmetrically along the circumferential direction of the iron core. The winding form can be the winding form of an ordinary asynchronous motor. An alternating current of a certain frequency is passed into the coil winding to generate a rotating magnetic field in the air gap, and the rotating magnetic field is in the secondary conductor. The induction generates eddy currents, and the polarity of this eddy current magnetic field is opposite to the rotating magnetic field generated by the primary current, and the two interact to generate levitation force. The system has a stable structure, simple control, no mechanical rotating mechanism, no mechanical vibration, noise and gyroscope effect, suitable for large air gap levitation occasions, and can realize inherently stable static and stable magnetic levitation.

The invention discloses a high-temperature superconducting maglev system and a maglev train. The high-temperature superconducting maglev system comprises a maglev mechanism and a buffering mechanism, wherein the maglev mechanism comprises a track made of a permanent magnet, a cryogenic container arranged above the track and multiple superconducting block layers, the multiple superconducting block layers are arranged in the cryogenic container and formed by arranging multiple superconducting blocks in a width direction of the track; the buffering mechanism is arranged between a frame and the cryogenic container to slow down motion of the frame in a vertical direction. According to the high-temperature superconducting maglev system and the maglev train, the multiple superconducting block layers are arranged, so that the problem that levitation force reaches saturation due to the fact that the thickness of the superconducting block on a single superconducting block layer is difficult to increase is solved, and an application magnetic field above the single superconducting block layer is effectively utilized, so that the levitation force is increased.

The invention relates a magnetic suspension bogie. The bogie comprises an upper framework located at the upper part, two lower frameworks located at the lower part, suspension devices and rail sensingdevices, wherein the upper framework and each lower framework are connected through a connecting device in a hinged and moving mode, the suspension devices are arranged at the bottoms of the two sides of each lower framework correspondingly, the rail sensing devices are arranged on the bottom surfaces of the middles of the lower frameworks, the two sides of the upper framework extend outwards toform mounting parts correspondingly, and air spring mounting seats are arranged on the mounting parts. According to the bogie, basic functions of suspension, drive and guide of a magnetic suspension train are integrated, so that the structure is simplified while the various functions are achieved; light-weight material is adopted for manufacturing, so that a low-temperature holding container can be used for containing more low-temperature liquid, and larger suspension force can be achieved; the upper framework is reasonable in structure, so that a framework body can be provided with connectorsof various devices, and the light weight is achieved on the premise of ensuring the strength; and air springs are arranged on the mounting parts on the two sides of the upper framework, so that a train body is effectively supported. The invention further relates to the magnetic suspension train.

The invention discloses a superconducting electric electromagnetic hybrid maglev train, which comprises L-shaped suspension frames and an I-shaped ground rail, and is characterized in that the upper end of each suspension frame is connected with a train body through an air spring; the suspension frames are arranged on the two sides of the ground rail, and the suspension frames and the ground railare arranged at intervals. A plurality of superconducting magnets is arranged at the lower end of each suspension frame. An 8-shaped upper-layer suspension coil and an 8-shaped lower-layer suspensioncoil are arranged at the upper end and the lower end of the ground rail respectively, an upper-layer power generation coil and a lower-layer power generation coil are arranged at the lower end of thesuspension frame, and the upper-layer suspension coil is electrically connected with the lower-layer suspension coil; and a propelling coil is arranged above the upper-layer suspension coil. The invention has the advantages of large operation air gap, self-stabilization, good suspension guiding dynamic performance, better curve passing capacity, higher superconducting magnet magnetic field utilization rate and lower track construction cost.

The invention discloses an expansion hanger which comprises an expansion tube, a pressing tube, a first plug, a bearing connector, a second plug, an expansion cone, a metal ring and a rubber sleeve. The expansion tube is provided with an expansion portion capable of expanding in the radial direction of the expansion portion. The pressing tube is arranged in the expansion tube in a penetrating mode, and annular space is formed by the pressing tube and the expansion tube. The first plug is used for plugging a cavity of the pressing rube. The bearing connector is used for sealing the front end of the annular space and is connected with the pressing tube through first threads, the bearing connector is connected with the expansion tube through second threads, and the first threads and the second threads are opposite in rotating direction. The second plug is used for sealing the rear end of the annular space. The expansion cone can slide in the annular space and divides the annular space into a front space and a rear space, the front space and the rear space are sealed, and a pressing hole communicated with the rear space is formed in the pressing tube. The expansion portion of the expansion tube is sleeved with the metal ring and the rubber sleeve. The expansion hanger can be widely suitable for hanging a sieve tube or a tail tube, no separation plate or bearing ring needs to be arranged, work time is greatly shortened, and the work risk is lowered.

The invention provides a magnetic suspension electromagnetic propulsion integrated carrier sled vehicle used for accelerating aircrafts. The carrier sled vehicle includes a track, a vehicle body, a first superconducting magnet set, a second superconducting magnet set, a first motor winding, a second motor winding, a first suspension sensing plate set and a second suspension sensing plate set; an aircraft is installed on the vehicle body, and the vehicle body can provide initial angle of attack for the aircraft; the first superconducting magnet set and the second superconducting magnet set arerespectively arranged on the two sides of the vehicle body; the first motor winding and the second motor winding are spaced on the track; the first motor winding and the first suspension sensing plateset are respectively in relative arrangement with the first superconducting magnet set; and the second motor winding and the second suspension sensing plate set are respectively in relative arrangement with the second superconducting magnet set. Through the application of the technical schemes, the technical problems in the prior art of unable adaption of magnetic suspension systems to ultra-high-speed motion states and the large volume and weight, complex structures and low working efficiency of magnetic suspension and electromagnetic propulsion systems can be solved.

The invention discloses an air floating support system. A piezoelectric ceramic ring is arranged above a support base, and a conical stator is arranged above the piezoelectric ceramic ring. A shaft rotor is arranged at the upper end of the conical stator, and an orifice is formed in the middle of the conical stator. A shell is arranged on the support base in a sleeved mode, a shaft hole and a positioning groove are formed in the shell, and a prism sleeve affixed with rectangular piezoelectric patches is placed in the positioning groove. A fastening end cover is arranged at the top of the shell, and the shaft rotor passes through the shaft hole, the prism sleeve and the fastening end cover. A high-pressure air pipe passes through the base and the shell to introduce high pressure gas respectively to the clearance of the conical stator and the radial clearance of the prism sleeve to form high pressure gas films. According to the inverse piezoelectric effect, the wall of the prism sleeve and the conical stator are driven by a piezoelectric material to vibrate with high frequency to produce ultrasonic excitation which acts on the high pressure gas films in the clearances, and a mixed suspension force is produced. The axial and radial controllable suspension of the rotor is realized by changing air pressure and voltage parameters. The air floating support system has a simple drivingstructure and no wear and tear, is intelligently controllable, and is suitable for some high-precision and pollution-free fields.

The invention relates to a magnetic-levitation inclined elevator and a control method of the magnetic-levitation inclined elevator and belongs to the field of elevators. The inclined elevator comprises an inclined rail, a levitation system, a driving system, a control system and a pedal. The levitation system comprises two pairs of levitation permanent magnets; each pair of levitation permanent magnets are coaxial and opposite up and down; one levitation permanent magnet in one pair and one levitation permanent magnet in the other part are mounted at two sides of the inclined rail along the line; the other levitation permanent magnets in the two pair are mounted at two sides of the bottom of the pedal; the driving system comprises a stator and a mover; the stator is laid in the middle of the inclined rail along the line; the mover comprises a mover iron core and a Halbach array permanent magnet; the mover is fixed in the middle of the bottom of the pedal; the control system is used for controlling input current of a stator winding through a given value obtained from a given acceleration curve and an actually measured load; finally, closed loop control of an elevator speed and an acceleration is realized. The magnetic-levitation inclined elevator provided by the invention is simple to operate, safe to operate and small in power consumption and is especially suitable for operating on a staircase, a gangway ladder and an inclined slope.

The invention provides a honeycombed suspension ball filler, belongs to the technical field of environment protection, and solves the problems that the existing biological filler ball is low in stability and poor in decontamination efficiency. The honeycombed suspension ball filler comprises a spherical body, wherein a plurality of through adhesion holes are arranged in the spherical body along the same axis direction; and the side walls of the adhesion holes are provided with concave-convex adhesion structures. The honeycombed suspension ball filler is high in stability and good in decontamination efficiency.

A magnetic suspension rotary drum type power conversion device is characterized by comprising power input mechanisms, a magnetic suspension box body board block, a linear track, track terminal boards and a magnetic suspension rotary drum type power output mechanism, wherein magnets repellent in magnetism are arranged between the bottom of the magnetic suspension box body board block and the linear track, the magnetic suspension box body board block suspends above the linear track through magnetic force. The track terminal boards are arranged at two ends of the linear track, one side of the magnetic suspension box body board block is provided with the magnetic suspension rotary drum type power output mechanism in transmission connection with the magnetic suspension box body board block, and the power input mechanisms are respectively installed at two ends of the magnetic suspension box body board block. The magnetic suspension rotary drum type power conversion device has the advantages of being simple in structure, safe, stable, large suspension force, low in cost and high in conversion efficiency, widely adapts to the environment and is environment-friendly.

The invention provides a repulsion type magnetic suspension shock insulation supporting base and a manufacturing construction method thereof. The repulsion type magnetic suspension shock insulation bracket supporting base comprises a structure loading-bearing means. A repulsion type magnetic device is arranged below the structure loading-bearing means. The repulsion type magnetic device comprises an upper electromagnet and a lower electromagnet, wherein the upper electromagnet and the lower electromagnet are arranged in the longitudinal direction and wound with electric wires. The arrangement of the electric wires guarantees that repulsion force is produced when the upper electromagnet and the lower electromagnet are charged with electricity. The upper end of the upper electromagnet is fixedly connected with the lower end of the structure loading-bearing means. The lower end of the upper electromagnet and the upper end of the lower electromagnet are provided with a concave face and a convex face which are matched with each other. The lower end of the lower electromagnet is fixed to a sliding and transferring supporting seat capable of insulating horizontal earthquakes; and the sliding and transferring supporting seat is fixed to a construction foundation. The repulsion type magnetic device insulates vertical vibration, so that the suspension force is large, both alternating current and direct current can be adopted, the size of the device is small, the cost is low, a special controlling regulating system is not needed, and the vibration insulating effect is good.

A permanent-magnetic suspension shaft comprises a main shaft and a guide fixed pulley running on a guide rail and is symmetrically disposed on up and down sides of the guide fixed pulley. Two permanent-magnetic suspension bearings are fixed on a bearing seat around the permanent-magnetic shaft. An air gap is set between the permanent-magnetic shaft and the permanent-magnetic bearing. The upper and lower permanent-magnetic suspension terminals are fixed on the main shaft and the upper and lower permanent-magnetic spacing terminal bearings are fixed on the bearing seat.

The invention discloses a stator permanent magnet-biased sheet-shaped inner-rotor bearingless asynchronous rotor. The stator permanent magnet-biased sheet-shaped inner-rotor bearingless asynchronous rotor comprises a stator and a rotor, wherein the rotor is arranged in an inner circle of the stator, the stator comprises a stator core, an axially-magnetized annular permanent magnet and an iron corebridge, a stator groove is formed in the stator core, a suspension winding and a torque winding are arranged in the stator groove, a T-shaped cylindrical boss is arranged at a middle part of the ironcore bridge and protrudes inwards, the rotor is a hollow thin circular post, an outer side air gap exists between the rotor and the stator core, an inner side air gap exists between the rotor and theT-shaped boss, a rotor groove is formed in a surface of the outer side air gap of the rotor, a guide strip is casted into the groove or a winding is wound around the groove, and the pole pairs of thewinding are different from those of the suspension winding. The stator permanent magnet-biased sheet-shaped inner-rotor bearingless asynchronous rotor is compact in structure and is simple to control, no coupling is generated between a suspension force and torque, and axial passive control and radial active control are performed.

The invention relates to a hybrid electromagnetic suspension system of a high-speed maglev train. The system comprises a plurality of suspension control modules, wherein each suspension control moduleincludes a suspension electromagnet, a suspension controller and a suspension sensor, the suspension electromagnet includes an iron core, a high-temperature superconducting coil and a normal conducting coil, the high-temperature superconducting coil and the normal conducting coil are jointly wound on the iron core, and the suspension controller is connected with the suspension sensor, the high-temperature superconducting coil and the normal conducting coil. Compared with the prior art, by using the system of the invention, a rated suspension force is provided by a suspension electromagnet ofa high-temperature superconducting coil part; and a dynamic adjustment suspension force is provided by the suspension electromagnet of a normal conducting coil part so that the maglev train can realize large-air-gap stable suspension, a precision requirement on a track line is reduced, and the system has an important value for increasing the speed of the high-speed maglev train, and particularly has decisive significance for a vacuum pipeline ultrahigh-speed maglev train system.

The invention discloses an induction melting cold crucible with full suspension and strong stirring ability. The induction melting cold crucible comprises a crucible body, a main induction coil, a bottom induction coil, a main magnetic field disturbance cylinder and a bottom magnetic field disturbance cylinder, wherein the main induction coil is arranged on the outer side surface of the crucible body, and radial suspension force is applied to a molten pool through the main induction coil, so that the molten pool can be separated from the side surface of the crucible body; the bottom inductioncoil is arranged at the bottom of the crucible; upward suspension force is applied to the bottom of the molten pool through a planar spiral bottom induction coil or a spiral conical induction coil viathe bottom induction coil, so that the bottom of the molten pool is separated from the inner bottom surface of the crucible, full suspension of the molten pool is realized, a smelting temperature isincreased, the uniformity of alloy components is improved, and skull formation is prevented. Besides, a spiral small conical or cylindrical induction coil is arranged at the bottom of the crucible, acting force is applied to cast molten metal, molten metal is located in the middle all the time, and casting is accurate.

The invention relates to a hydraulic expansion-type rotary liner hanger which mainly comprises a central pipe, a rubber ring, an expansion cone, a hanger body, a spline shaft, a dual-male connector, a hollow rubber plug, a cementing rubber plug, a rubber plug shearing seat and a rubber plug conduit. The hanger body is a variable-diameter expansion pipe, the rubber ring is added at the upper end of the expansion pipe, the lower end of the expansion pipe is connected with the dual-male connector, a spline groove in the dual-male connector is coupled with a spline on the spline shaft, the upper end of which is connected with the central pipe, a burst disc is mounted on the spline shaft, the expansion cone is sleeved on the spline shaft, the rubber plug conduit is connected with the lower end of the dual-male connector, the lower end of the rubber plug conduit is connected with a liner, the hollow rubber plug and the shearing seat are arranged in the rubber plug conduit, the shearing seat is mounted on a shoulder in the rubber plug conduit, and the hollow rubber plug is connected with the rubber plug shearing seat through pins and threads. The invention has the advantages that the well-cementing quality and the well-cementing success rate of the liner are improved by rotating a whole tubular column in cementing a well, the problems of annulus sealing in the stacking section of the liner is solved, reverse snapping is avoided after hanging, and the internal through diameter is greater.