13results about How to "Magnetically stable" patented technology

The invention discloses a magnetorheological polishing processing method for a NiP modified reflector, which comprises the following steps of: preparing a NiP modified layer, and carrying out ultra-precision turning processing and magnetorheological polishing modification processing on the NiP modified layer until the NiP modified layer meets index requirements. According to the magnetorheological polishing machining method for the NiP modified reflecting mirror, the NiP modified reflecting mirror blank workpiece is machined through ultra-precision turning and magnetorheological polishing, so that surface defects generated in the machining process of the NiP modified reflecting mirror blank workpiece can be effectively eliminated, and the machining efficiency can be improved; meanwhile, the surface shape precision and the surface quality of machining can be improved, the NiP modified reflector blank workpiece can be machined into the high-quality NiP modified reflector, and the method has the advantages of being few in machining defect, high in machining quality, high in machining efficiency, good in repeatability and the like; the method is of great significance in promoting wide application of the NiP modified reflector in the optical fields of visible light wave bands, shorter wavelength wave bands and the like.

The invention discloses a ganoderma lucidum extraction method based on a reusable magnetic enzyme. The ganoderma lucidum extraction method comprises the following steps: S1, preparing a nanoscale amination modified Fe3O4-SiO2 magnetic composite carrier; s2, on the basis of the amination modified Fe3O4-SiO2 magnetic composite carrier, cellulase is added, and a magnetic immobilized enzyme buffer solution is obtained; s3, the ganoderma lucidum sporocarp is put into a magnetic immobilized enzyme buffer solution to be subjected to enzymolysis, extraction and filtration, effective components of ganoderma lucidum are obtained, and magnetic immobilized enzyme is recycled for repeated utilization; according to the method, the magnetic nanoparticles are modified, so that the surfaces of the magnetic nanoparticles have specific active groups, meanwhile, the magnetic response advantage of an inorganic magnetic material is reserved, the nanoscale amination-modified Fe3O4-SiO2 magnetic composite carrier is prepared, enzyme molecules can be directly anchored on the surfaces of the magnetic nanoparticles, and enzyme activity is improved. The immobilized enzyme can be conveniently recycled from a reaction system, so that the cost of an enzyme preparation can be reduced, and the enzyme activity stability can be improved.

According to the method for preparing the nanoscale carbonyl iron powder under the conditions of normal pressure and low temperature and the special integrated equipment for implementing the method, efficient cooling and nucleation of iron steam can be achieved by adopting a specially-designed micro-nano bubble generation device, and the nanoscale carbonyl iron powder which is narrow in particle size distribution, uniform in morphology and excellent in magnetic performance is prepared.

The invention discloses a linear flow regulating valve based on a main and auxiliary bipolar magnetic circuit, and relates to the field of valve design, the linear flow regulating valve comprises a valve body and a coil assembly located on the valve body, and the coil assembly further comprises annular hollow stop iron; the interior of the annular hollow stop iron is hollow, and the annular hollow stop iron is coaxially fixed on the inner side of the coil; the top fixed stop iron is coaxially and movably connected with the interior of the annular hollow stop iron and can move in the length direction of the annular hollow stop iron. Opposite end faces between the top fixed stop iron and the bottom movable armature are provided with opposite tip portions, a gap is reserved between the two tip portions, and the two tip portions are located on the axis of the annular hollow stop iron. And a force adjusting spring is connected between the two tip parts. By the adoption of the scheme, after the valve body is assembled, the top fixing stop iron can be adjusted up and down, so that the linear interval and the adjustable range of the top fixing stop iron are adjusted by adjusting magnetic force, and device abrasion and personal errors caused by repeated disassembly and assembly are avoided.

The invention relates to the technical field of permanent magnet preparation, and particularly discloses a high-temperature-resistant neodymium-iron-boron magnet and a preparation method thereof. The high-temperature-resistant neodymium-iron-boron magnet comprises the following elements in percentage by mass: 17.4%-19.5% of Nd, 0.66%-0.72% of B, 38.37%-41.19% of Fe, 0.36%-4.8% of Dy, 0.18%-0.3% of Nb, 0.18%-0.3% of Al, 0.03%-0.09% of Cu, 29.1%-34.8% of an alloy rapid hardening sheet and the balance of unremovable impurities, wherein the alloy rapid hardening sheet contains Pr, Tb, Bi and Sn; the preparation method comprises the following steps: grinding the surface of an alloy rapid hardening sheet to be bright, mixing the alloy rapid hardening sheet with a pretreated magnet block, adding zirconium oxide balls, putting into a reaction kettle of a rotary diffusion furnace, vacuumizing the reaction kettle, introducing argon, rotating at the rotating speed of 4-6r / min, keeping the temperature at 700-704 DEG C for 3-7h, and carrying out rotary diffusion, so as to obtain the zirconium oxide-based composite material. And then carrying out heat preservation at 850-950 DEG C for 2-4 hours for high-temperature diffusion and heat preservation at 450-550 DEG C for 2-4 hours for tempering heat treatment by using a vacuum tube furnace in a vacuum environment. The high-temperature-resistant neodymium-iron-boron magnet has the advantage that the defect that heat resistance of a conventional neodymium-iron-boron magnet is still insufficient is overcome.

The invention provides a gradient magnetizing method of a Halbach magnet ring, which comprises a magnet ring, the cross section of the magnet ring is sequentially provided with magnetic poles from outside to bottom, from left to top, from top to bottom, from top to bottom, from top to bottom, from top to bottom, from top to bottom, from top to bottom and from top to bottom, and from top to bottom, and the magnet ring is axially and asymmetrically magnetically distributed and comprises a low-magnetic-force upper magnetic area and a high-magnetic-force lower magnetic area; the magnetizing process comprises the following steps: a horizontal magnetic pole magnetizing step: applying a horizontal magnetizing magnetic field to a left magnetic pole area and a right magnetic pole area, and forming gradient magnetization with weak upper part and strong lower part by regulating the magnetic field intensity of the upper part to be lower than the magnetic field intensity of the lower part; and axial magnetic pole magnetizing: applying an axial magnetizing magnetic field to the downward and upward magnetic pole areas, and forming gradient magnetization with weak upper part and strong lower part by regulating the magnetic field intensity of the upper part to be lower than the magnetic field intensity of the lower part. The problems that in the prior art, the magnetizing requirement cannot be met, and magnetic disorder is likely to be generated are solved.

The utility model discloses an anti-toppling ice tray of an ice maker, which comprises a base plate, a plurality of ice block accommodating strips are inserted into the upper surface of the base plate, the front surfaces of the ice block accommodating strips are fixedly connected with front positioning pin plates, and the rear surfaces of the ice block accommodating strips are fixedly connected with rear positioning pin plates. Locating pins are arranged on the lower surface of the front locating pin plate and the lower surface of the rear locating pin plate, front locating holes are formed in the upper surface of the base plate, rear locating holes are formed in the upper surface of the base plate, a first magnet is fixedly connected to the lower surface of the ice block containing strip, and a second magnet is fixedly connected to the lower bottom wall of the base plate. By means of the device, deformation or falling in advance can be avoided, so that the anti-toppling effect is achieved, and it is guaranteed that the ice blocks are regular in shape.

The utility model discloses a permanent magnet for a monocrystalline silicon furnace with a built-in water jacket, and belongs to the technical field of monocrystalline silicon furnace accessories. A cooling cavity is formed in the cooling water jacket; the axis of the cooling water jacket is vertically arranged; the sealing cavity is positioned in the cooling cavity; the lower wall of the sealing cavity is made of a magnetic conductive material; the permanent magnet is arranged in the sealing cavity, and the permanent magnet is arranged around the axis of the cooling water jacket; magnetic poles of the permanent magnets are respectively positioned at the upper end and the lower end; the permanent magnet comprises a plurality of sub-blocks which are distributed in the vertical direction; the sealing cavity is arranged in the cooling cavity of the cooling water jacket, and the permanent magnet is arranged in the sealing cavity, so that the external space of the monocrystalline silicon furnace is not occupied; meanwhile, the temperature of the permanent magnet can be constant through the cooling cavity, stable magnetic performance of the permanent magnet is guaranteed, and the magnetic field intensity generated by the permanent magnet is stable; furthermore, the permanent magnet does not generate energy consumption during use, the structure is simple, and the use and maintenance cost is low.

The invention discloses a magnetorheological polishing method for a NiP modified reflector, and the processing method comprises: preparing a NiP modified layer, and performing ultra-precision turning and magnetorheological polishing shaping processing on the NiP modified layer until the index requirements are met. In the magnetorheological polishing method for the NiP modified reflector of the invention, ultra-precision turning and magnetorheological polishing are used to process the NiP modified reflector blank workpiece, which can not only effectively eliminate the surface defects generated during the processing of the NiP modified reflector blank workpiece, but also be beneficial to improving the processing efficiency, and at the same time can improve the surface shape accuracy and surface quality of the processing, which is beneficial to processing the NiP modified reflector blank workpiece into a high-quality NiP modified reflector, and has the advantages of few processing defects, high processing quality, high processing efficiency, good repeatability, etc., which is of great significance for promoting the wide application of NiP modified reflectors in optical fields such as visible light bands and shorter wavelength bands.

The present invention relates to a method for producing low-temperature Hi-B steel with enhanced AlN suppression capability, comprising the steps of calculating the AlN solid solution temperature and the AlN solid solution amount at the heating temperature of the billet through a hot rolling process, wherein the billet heating temperature is 1199-1229°C, the heating time is 120-135min, the temperature of 1050-1150°C when the austenite phase content is the largest is selected as the normalizing heating temperature, the holding time is 2-4min, and then air cooling is started, and when the air cooling reaches 890±10°C, quenching is started in 95-100°C water for rapid cooling, and the infiltration The nitrogen process adjusts the actual nitrogen content infiltrated in the nitriding process to ensure the constancy of the total amount of innate and acquired AlN inhibitors. The nitriding temperature is 750-820°C, the nitriding time is determined according to the N content to be infiltrated, and the nitriding atmosphere is dry 75% H2+25% N2 plus 4-14% NH3. The present invention adjusts the N content infiltrated in the nitriding annealing process according to the Al and N contents in the low-temperature Hi-B steel composition and the ingot heating temperature to ensure the stability of the total amount of innate and acquired nitride inhibitors and the method of inhibition ability.

The invention discloses a corn field weeding machine and a weeding method, and relates to the technical field of field weeding. The device comprises a traveling device which comprises a vehicle body, and crawler-type traveling mechanisms are constructed on the two sides of the vehicle body; the vertical supporting mechanism comprises a supporting rod fixedly mounted on the top surface of the vehicle body, the supporting rod is slidably sleeved with a mounting sleeve, an electromagnet is mounted at the top end of the supporting rod, and a permanent magnet with a fixed magnetic pole is mounted on the top surface of a sleeve cavity of the mounting sleeve; the horizontal supporting mechanism comprises a cylindrical rod which is horizontally and rotatably mounted on the top surface of the mounting sleeve and is horizontally arranged, the two ends of the cylindrical rod extend out of the mounting sleeve, and extension rods are coaxially mounted at the two ends of the cylindrical rod respectively; the first cutting mechanism comprises a positioning block arranged on the extension rod in a sleeving mode, a vertical rod is installed on the bottom face of the positioning block, and a first cutting tool is constructed at the bottom end of the vertical rod; the problems that in existing mechanical weeding, weeds between plants are difficult to clear away, and corn is prone to being accidentally damaged are solved.

The invention relates to the technical field of magnetic materials, and particularly discloses a nanocrystalline soft magnetic alloy and a preparation method thereof. The molecular formula of the nanocrystalline soft magnetic alloy is Fe < 77-x > Ni < x > Si < 11.5-y > PyB < 8 > Nb < 2.7-z > Mo < z > Cu < 0.8 >, x is equal to 6-15, y is equal to 2-4, and z is equal to 1-2.5; the preparation method comprises the following steps: S1, preparing a strip-shaped amorphous alloy; and S2, the strip-shaped amorphous alloy is subjected to copper coating treatment, then the temperature is increased to 480-550 DEG C according to the temperature increasing rate of 20-25 DEG C / min, heat treatment is conducted for 10-30 min at the temperature, finally air cooling is conducted to the room temperature, the nanocrystalline soft magnetic material is obtained, and in the copper coating treatment, the thickness ratio of a copper metal layer to the strip-shaped amorphous alloy is (1-2): 1. The product provided by the invention can be used for a magnetic field with a direct current component, and has the characteristics of high direct current resistance and excellent soft magnetic performance.

The application relates to the field of magnetic core materials, and particularly discloses a low-temperature sintering NiZn magnetic core material and a preparation method thereof. The low-temperature sintering NiZn magnetic core material comprises the following raw materials in percentage by mass: NiO 10-20%, ZnO 20-35%, Fe2O3 45-55%, and a sintering aid 2-5%, wherein the sintering aid comprises at least two of Bi2O3, V2O5 and MnO. By optimizing the component proportion of each raw material and the sintering aid, the application realizes low-temperature sintering below 950 DEG C, can reduce energy consumption by more than 30% compared with the traditional process which needs to be sintered above 1200 DEG C, and solves the problems of easy decline of magnetic performance, insufficient sintering density and increased loss caused by low-temperature sintering, so that the prepared magnetic core material has low loss, a density greater than or equal to 94%, and a magnetic permeability greater than or equal to 85 (1MHz), meets the demand of high-frequency electronic devices, and has high compatibility with low-temperature packaging materials.