121results about How to "Improve the magnetic shielding effect" patented technology

The invention discloses a preparation method for electromagnetic wave interference resistant iron silicon aluminum nickel alloys. The invention comprises the following steps: firstly, ferrum, aluminum, silicon and nickel with a purity more than 99.9 weight percent are taken as raw materials and laid into a medium frequency vacuum induction furnace for smelting, and a master alloy is obtained; secondly, the master alloy after smelting is laid into a quick quenching device; an alloy ingot casting is quickly poured on a water-cooling roll wheel which rotates at high speed after arc remelting under the protection of high purity inert gases, and a quickly condensed sheet band or a quickly condensed sheet is obtained; thirdly, the sheet band or the sheet is laid into a ball mill for ball milling flat processing, and flat powder is obtained; fourthly, the flat powder is laid into a stainless steel tube which is then vacuumized and filled with high purity inert gases for protection, and then the stainless steel tube is laid into a tube furnace for heating, heat preservation and cooling along with the furnace; fifthly, the flat powder and binding agents are mixed and milled for processing the sheet. The preparation method for the electromagnetic wave interference resistant iron silicon aluminum nickel alloys adds adequate nickel into Sendust alloys, thereby the processability of the alloys is improved; the ball milling time is reduced; the cost of industrial production is saved; simultaneously the magnetic conductivity can be improved and the magnetic shielding effect can be improved.

The invention belongs to the technical field of gyroscopes and relates to a magnetic shielding method used for a magnetic resonance gyroscope. The active-passive magnetic shielding method includes 1) a step of passive shielding, namely a step of setting a passive shielding layer at the outside of the magnetic resonance gyroscope, with the shielding layer being a high-magnetic-permeability material, and 2) a step of active compensation, namely a step of setting an active compensation device inside a passive shielding device and outside a sensitive structure of the magnetic resonance gyroscope, wherein the active compensation device comprises an atom magnetometer, a three-dimensional magnetic field coil and a current source. The technical problem to be overcome is a problem that magnetic shielding methods at present cannot meet efficient environment magnetic field shielding requirements for small-size magnetic resonance gyroscopes. The method improves magnetic shielding performance on the base of not increasing hardware components of the magnetic resonance gyroscope.

A fixing device includes a heating member, a pressing member, a coil, a magnetic core, a path switching member switching a magnetic path between a first path and a second path, and a magnetism adjustment member. The magnetism adjustment member allows a passage of a magnetic flux from the magnetic core towards the heating member within the magnetic field range when the magnetic field path is switched to the first path, and shields the magnetic flux without allowing the passage of the magnetic flux within the magnetic field range when the magnetic path is switched to the second path. Further, the magnetism adjustment member has a plurality of ring-shaped portions formed of a single wire material having an endless shape. Each of the ring-shaped portions extends in a longitudinal direction of the magnetic core according to a size of the sheet.

The invention discloses a spinning forming method for manufacturing a magnetically soft alloy cylindrical part. The method includes the steps that the geometric dimensions of a cylindrical blank are determined according to the principle that the material size is not changed in the plastic deformation process, the actual wall thickness of the thin-wall cylindrical part, the requirement for trimming after forming and the design principle that the wall thickness reduction rate is 40%-80%; the pipe blank is heated to 700 DEG C, and preheating is carried out after 0.5h of heat preservation; multi-pass staggered spinning forming is carried out on the cylindrical blank to enable the wall thickness to be reduced to a predetermined value; a workpiece subjected to spinning forming is heated to 1100-1180 DEG C in vacuum protection, heat preservation is conducted for 3-6h, then the workpiece is cooled to 600 DEG C at the speed which is not higher than 200 DEG C/h and continues to be cooled to 200 DEG C at the speed not smaller than 400 DEG C/h, and the workpiece is discharged out of a furnace and subjected to final heat treatment to improve the magnetic performance of the material; and excess materials at the two ends of the workpiece are cut off, so that a final product is obtained. By means of the spinning forming method for manufacturing the magnetically soft alloy cylindrical part, the cylindrical part with high forming quality and good soft magnetism performance can be obtained, and the defects that a traditional machining method is low in material utilization rate, poor in forming quality, prone to flux leakage and the like are overcome.

The invention belongs to the fiber-optic gyroscope technology, and relates to a magnetic shielding case of a fiber-optic gyroscope, which is reusable, and easy to assemble and disassemble. The magnetic shielding case of the fiber-optic gyroscope comprises an upper shielding case, a lower shielding case, a base, a skeleton and a fiber-optic ring, wherein an upper shielding case inner ring is located between the inner cylindrical surface of the skeleton and a lower shielding case side wall, the fiber-optic ring surrounds the outer periphery of the skeleton and is closed by the upper shielding case. An upper shielding case cover plate, the upper shielding case inner ring, the lower shielding case side wall, a lower shielding case bottom plate, an upper shielding case bottom plate and an upper shielding case outer ring form a closed magnetic circuit, the magnetic sensitive part in a fiber-optic gyroscope optical path can be right surrounded by the closed magnetic circuit, and the closed magnetic circuit is perpendicular to the spreading direction of light, thus realizing high-performance magnetic shielding and further playing a role in protecting the fiber-optic ring. In addition, without the use of modes of gluing or welding and the like, all parts are assembled only by using fasteners in the assembling process of the magnetic shielding case of the fiber-optic gyroscope, the shielding case is simple and easy to assemble and disassemble.

In this sensor, a rotatable rotor 20 is arranged inside a cylindrical case 10 and a cap-shaped magnetic shield 11 is set inside the case 10 so as to surround the rear end of the rotor. A magnet 21 fixed at the rear end of the rotor and a magnetic sensor IC 15, facing to the magnet, mounted on a wiring board 14 are arranged inside it. A terminal part 14A of the wiring board is protruded outside from the notch 11a formed at the sidewall of the cap-shaped magnetic shield 11. A cylindrical magnetic shield 12 is attached to the cap-shaped magnetic shield 11 so as to cover the notch 11a. The magnetic shielding effect is not lost and the assembly is easy.

The invention aims to provide a Dewar bottle used in high-temperature superconductor magnetic detection. The Dewar bottle comprises an insulation layer, a vacuum layer and a Dewar layer, and is characterized in that: one wall of the Dewar bottle is provided with a shielding film consisting of conductive material through vapor deposition; in addition, different walls of the Dewar bottle are respectively provided with a shielding film consisting of conductive material through vapor deposition; moreover, different walls can be provided with different or identical conductive material through vapor deposition. The invention has the advantages that: magnetic shielding effect is obviously improved along with stable operation of magnetic detection and stable signal; the coated Dewar bottle can complete normal magnetic detection in a laboratory without a shielding chamber, thereby reducing cost and workload; moreover, the invention gives an enormous impetus to the industrialization of high-temperature superconductor magnetic detecting devices.

The invention relates to a nuclear magnetic resonance gyroscope experiment platform structure. The platform is used for experimentally researching and verifying various techniques, such as, air chamber parameters, light path features and magnetic field distribution, of a nuclear magnetic resonance gyroscope prototype. The structure mainly comprises an oven structure, a coil structure, a magnetic shielding structure and a light path system, wherein the oven structure is used for fixing and heating an atom air chamber and researching different heating techniques; the coil structure is positioned and fixed by a V-shaped slot, a key, a bracket, and the like, and can be used for performing high-precision magnetic field control and compensation; the magnetic shielding structure has a four-layer square shielding barrel and is used for shielding an outside magnetic field; and the light path is located on the exterior of the shielding barrel, is constructed by adopting a cage type system and can be conveniently adjusted and aligned. The nuclear magnetic resonance gyroscope experiment platform structure is reasonable in layout, is conveniently mounted and aligned, is simple in experiment operation, can be used for experimentally researching different techniques and can establish a basis for the research and development of the nuclear magnetic resonance gyroscope prototype.

The invention belongs to the field of wireless power supplying and information transmission, and discloses a communication mechanism for realizing wireless power supplying and photoelectric transmission by adopting a tank type magnetic core. The communication mechanism comprises a fixing assembly and a rotating assembly, wherein the rotating assembly is connected with the fixing assembly through bearings; a wireless power supply mechanism is arranged between the fixing assembly and the rotating assembly; the wireless power supply mechanism comprises a power supply emitting mechanism and a power supply receiving mechanism; the power supply emitting mechanism comprises the tank type magnetic core; an opening is formed in the middle part of the tank type magnetic core; a cylindrical fixed column extending towards the opening is arranged at the middle part of the opening; an annular single-purpose framework is arranged on the side surface of the fixed column in a sleeving manner; the single-purpose framework is provided with an annular groove along the circumferential surface on the outer side; a coil is arranged in the groove; the power supply receiving mechanism and the power supplyemitting mechanism are symmetrically arranged up and down, and are of the same structures. By the use of the tank type magnetic core, the communication mechanism disclosed by the invention has the characteristics of extremely good magnetic shielding effect and a high inductance value in a unit space, and can realize a small-size, light-weight and anti-interference power supply device.

The invention provides a modified nanocrystalline strip, a preparation method and application thereof. The preparation method comprises the following steps of: conducting rolling treatment on a nanocrystalline strip with double faced adhesive tape attached to one face to obtain a micro-fragmented nanocrystalline strip; carrying out acid etching surface treatment on the obtained micro-fragmented nanocrystalline strip; carrying out alkali washing surface treatment on the nanocrystalline strip subjected to acid etching surface treatment; sequentially carrying out water washing and alcohol washing on the nanocrystalline strip obtained by the alkali washing surface treatment, and then performing drying; and subjecting the dried nanocrystalline strip to micro-oxidation treatment to obtain the modified nanocrystalline strip. The obtained modified nanocrystalline strip has a lower magnetic conductivity imaginary part and lower loss, is more favorable for a wireless charging system to acquire high electric energy transmission efficiency, and can enable the wireless charging system to have better electric energy transmission efficiency when being applied to a nanocrystalline composite structure magnetic sheet.

The invention discloses a semiconductor packaging device with a magnetic shielding function and a production method thereof. The semiconductor packaging device comprises a semiconductor packaging device main body and a magnetic conduction material which is attached on the surface of the semiconductor packaging device, and the magnetic conduction material is attached on the surface of the semiconductor packaging device through adhesive, die-casting forming, coating or printing. The shielding effect of the semiconductor packing device such as a storage card within the high-frequency range (more than 300MHz) is similar to that of aluminum foil, the shielding effect of the semiconductor packaging device in the medium-low frequency range (less than 300MHz) is similar to no interference effect, and the shielding effect is obvious.

The invention provides a preparation method of a PET / magnetic Fe3O4 functional nanocomposite material. The preparation method is as below: first preparing magnetic Fe3O4 nanoparticles by a co-precipitation method; and then conducting surface modification on magnetic Fe3O4 nanoparticles with KH550, so that the surface of Fe3O4 magnetic nanoparticles are grafted with active functional groups and that modified Fe3O4 magnetic nanoparticles can organically bind with PET molecular chains. Addition of modified Fe3O4 magnetic nanoparticles with different proportion in an esterification process of PET esterification polycondensation and adjustment of the addition amount of the modified Fe3O4 magnetic nanoparticles can obtain uniformly dispersed PET / magnetic Fe3O4 functional nanocomposite material with good reinforcement, toughening and electromagnetic shielding effects. A film prepared from the modified PET / magnetic Fe3O4 functional nanocomposite material has magnetic shielding effectiveness reaching a highest value -52 dB and an average value about -32 dB.

The invention belongs to the field of electromagnetic flow measurement, and specifically relates to an electromagnetic flow transducer. The electromagnetic flow transducer comprises a measuring pipeline (10) prepared by non-magnetic metal, an embedded measuring assembly (20) prepared by an insulating material is fixedly arranged in the measuring pipeline (10) by means of a sealing part, the embedded measuring assembly (20) is provided with a fluid passage (24) for fluid to flow through, a pair of inductive electrodes (21) and an excitation structure member (22) are arranged around the fluid passage (24), and the length of the embedded measuring assembly (20) is shorter than that of the measuring pipeline (10). The electromagnetic flow transducer is simple in structure, the distance between two pole pieces of the excitation structure member can be reduced, and therefore power consumption can be reduced; the non-magnetic metal pipeline is high in intensity and has a good magnetic shielding effect, the electromagnetic flowmeter is simplified, and the cost is reduced; the area of exposed metal in the pipeline is increased as much as possible, the exposed metal is directly contacted with measuring fluid, and has a grounding electrode effect, and interference is eliminated, and the safety factor of the electromagnetic flowmeter is increased.

The invention discloses a crop cultivation device facilitating plant spacing adjustment, and belongs to the technical field of crop cultivation. The crop cultivation device can indirectly control a cultivation floating platform to adjust the plant spacing through an adjusting iron block by introducing a hydroponic mode and based on the suspension characteristic of the cultivation floating platform, the crop cultivation device is very convenient, and absorption of nutritional ingredients is more effective; meanwhile, a specially-arranged sensing floating ball can sense the absorption condition of a nutrient solution, the density is reduced after nutritional ingredients are consumed to a certain degree, the sensing floating ball sinks to pull a supplementing ball bin to release special nutrients, and the special nutrients are received and increased by the cultivation floating platform; and then, the cultivation floating platform also gradually sinks, so that the roots of the crops can absorb nutritional ingredients deposited at the water bottom, finally, after the cultivation floating platform is in direct contact with the water bottom, a multi-section ejector rod triggers the release action of nutrients to restore the density, then the cultivation floating platform and the sensing floating ball are reset again to start normal cultivation, the cultivation cost of the crops can be effectively controlled, and the absorption effect on the nutritional ingredients is improved.

The invention belongs to the technical field of electromagnetic induction heating, and discloses a double-rotor electromagnetic heating machine. The heating machine totally converts input mechanical energy into thermal energy and transmits the thermal energy through a fluid heat-transfer medium. The heating machine adopts a double-rotor and double-air-gap structure, and a permanent magnetic rotor adopts a halbach magnetic structure to improve the utilization rate of a permanent magnet and reduce use quantity of iron cores of the rotor. When the rotor is driven by external mechanical power, a stator of the heating machine is located in an alternating magnetic field formed by a rotary permanent magnetic field. Heating is carried out through hysteresis, the eddy-current effect and the current thermal effect of a closed electric conductor in the stator. A baffling plate type heat exchanging channel is arranged in the stator so as to enlarge a heat exchanging area and improve heat exchange efficiency. The heating machine has the advantages of being simple in structure, easy to machine, high in utilization rate of the permanent magnet, high in heat exchange efficiency, capable of being used as small domestic heating equipment, and also capable of being used in fields such as mariculture, heating in work stations in alpine regions and warm water irrigation in high-latitude regions, and the like.

The present invention relates to a Halbach permanent magnet linear oscillation motor, which comprises a housing, a stator main iron core, a rotor iron core and a linear axis. The stator main iron core is fixedly held in the housing and a winding is wound onto the stator main iron core. The rotor iron core is accommodated in the housing and is arranged opposite to the stator main iron core. A Halbach permanent magnet array is arranged outside the rotor iron core. The linear axis runs through the housing and is pivotably connected with the housing through a pair of linear bearings. The rotor iron core is fixedly arranged onto the linear axis and is in linkage with the linear axis. The Halbach permanent magnet array is adopted by the Halbach permanent magnet linear oscillation motor, so that an air gap flux larger than that of a conventional magnet can be obtained. Meanwhile, the Halbach permanent magnet linear oscillation motor is good in magnetic shielding effect and can reduce the thickness of a rotor magnetic-conductive yoke.

The invention discloses a permanent-magnet linear motor based on an arc-shaped and inner-step shaped hybrid structure of a stator. The motor comprises a stator armature primary side and a Halbach permanent-magnet mover secondary side, the stator armature primary side is located on the outer side of the permanent-magnet mover secondary side, the stator armature primary side is formed by a stator iron core and an armature winding, inner-step shaped structures are adopted by the ends of two sides of the stator iron core, and arc-shaped structures are adopted by inner teeth of the stator iron core; the permanent-magnet mover secondary side is formed by a mover iron core and a permanent magnet adhering to the surface the of the iron core, and a Halbach array structure is adopted by the permanent magnet. By means of the motor, air gap magnetic flux larger than a conventional magnet can be obtained, the motor has a better magnetic shielding effect, and the thickness of a magnetic conductive yoke of the mover can be reduced. The invention provides an analysis model of an arc-shaped tooth structure, and the magnitude of magnetic conductance and a magnetic conductance-position variation curve can be derived by means of the model. The optimal structure of the motor is obtained by adopting a Taguchi optimization algorithm.

The invention provides a vertical reciprocating friction-wear testing machine with a magnetic shielding function. The vertical reciprocating friction-wear testing machine comprises a rack, a reciprocating mechanism, a friction loading mechanism and a magnetic shielding case, wherein the rack comprises a top plate, a middle plate and a bottom plate, the middle plate and the bottom plate are connected through support rods, and a vertical support plate is mounted between the middle plate and the top plate; the reciprocating mechanism comprises a polished rod and a sliding seat allowing a block sample to be loaded, the polished rod is fixed between the rear end of the top plate and the middle plate, and the sliding seat can be movably nested on the polished rod; the friction loading mechanism is provided with a press head assembly, a lever, a support mechanism and a displacement loading device, a thermocouple temperature sensor is mounted in the press head assembly, the press head assembly can movably penetrate through the vertical support plate, the front end of the press head assembly is pivoted with the lever, and the rear end of the press head assembly is used for loading a pin sample and can be contacted with the sliding seat; the upper end of the lever is pivoted to a shaft seat mounted at the front end of the top plate, the lower end of the lever is connected with the displacement loading device, the support mechanism is contacted with the rear side surface of the lever, and the upper end of the support mechanism is pivoted to the vertical support plate; the magnetic shielding case is placed on the middle plate.

The invention provides a silicon steel magnetic shielding which can effectively solve the problems that in the prior art, the silicon steel magnetic shielding is poor in rigidity, easy to transform, high in cost, serious in waste and the like. The silicon steel magnetic shielding comprises two supporting trays and a frame type structure which connects the two supporting trays; a plurality of mutually adhered oriented silicon steel sheets are arranged between every two supporting trays; lateral sides of the oriented silicon steel sheets are welded to the frame structure through argon arc welding. The silicon steel magnetic shielding has the advantages of being flat and compact, not easy to deform and good in shielding effect and effectively reducing costs due to the fact that leftover materials of the oriented silicon steel sheets are served as production raw materials.

The invention discloses an inductive element and a manufacturing method thereof. The inductive element comprises laminated bodies and a closed-circuit magnetic core, each laminated body is formed by alternate laminating of a planer spiral coil and an insulation layer, a through hole is reserved at the center of each laminated body, the planer spiral coils encircle the through holes, and one part of the closed-circuit magnetic core penetrates through the through holes. Compared with a laminated inductor in the prior art, the inductive element has the advantages that size is increased slightly, and inductance is improved greatly.