244results about How to "Magnetically stable" patented technology

Methods and devices for measuring elongation, wear, and internal temperature of a conveyor belt to catch signs of conveyor belt failure such as breakage by detecting a magnetic field from a magnetic body by using a magnesium sensor, as well as a rubber magnet sheet as a magnetic body and a method of producing the sheet, the rubber magnet sheet being able to be used while it is embedded in the conveyor belt. To measure elongation of a running conveyor belt ( 11 ), a magnetic field of a magnetic body ( 2 ) embedded in the belt ( 11 ) is detected by a magnetism sensor ( 3 ) fixed to the earth, and elongation of the belt ( 11 ) is calculated from temporal variation of the detected magnetic field.

The invention discloses a polyphenylene sulfide composite material and a preparation method thereof. The polyphenylene sulfide composite material comprises the following formula components in part by weight: 72 to 92 parts of ferrite magnetic powder, 5 to 18 parts of polyphenylene sulfide, 2 to 8 parts of cyclic polyester and 0.5 to 2 parts of coupling agent. By interaction of the components in aproper content range in the extrusion process, the polyphenylene sulfide composite material has good processing flow property and mechanical performance and stable magnetic performance. The product can be obtained by mixing and extruding the components according to the formula in the preparation method of the polyphenylene sulfide composite material; and the preparation method is simple in process, low in cost, low in equipment requirement and suitable for industrialized production.

The invention relates to a rotor of a high-quality and high-speed built-in permanent magnet motor and a magnetic steel structural parameter determining method thereof. In the invention, the whole section magnetic steel of each electrode of the rotor of a conventional built-in permanent magnet motor is divided into multiple sections of magnetic steel which have the same polarity and different widths; the multiple sections of the magnetic steel are respectively arranged in a rotor core; and reinforcing ribs with the function of magnetic isolation are arranged among the multiple sections of the magnetic steel. By reasonably modulating and determining the width and distribution of each section of the magnetic steel, the air gap magnetic density waveform approaches sine distribution; harmonic components are reduced to the greatest extent; the eddy current loss of the magnetic steel and the torque pulsation of the motor are simultaneously reduced; and the electromagnetic performance of the motor is enhanced. Furthermore, the multiple sections of the magnetic steel are arranged in the circumference along the rotor; the highest rotating speed of the safe operation of the rotor is greatly enhanced on machinery; the radial thickness which is needed by the magnetic circuit of the rotor is obviously reduced on the structure; the rotational inertia and weight of the rotor are reduced; the dynamic response of the motor is improved; and the requirements of a high-speed driving system on the performance of the motor are met.

The invention relates to a production method of high magnetic induction oriented silicon steel, comprising the steps of smelting, continuous casting, hot rolling, normalization, decarbonization and annealing, MgO coating, high-temperature annealing and insulation coating, wherein the normalization comprises the steps that: normalization is carried out on a hot rolling plate, nitridation is finished synchronously, the temperature of normalization and nitridation is 1050-1150 DEG C, the atmosphere is 5-35% NH3 (volume percentage), and the balance of gas is N2; after the normalization and nitridation, the N content nitrided into the hot rolling plate is 60-250ppm; and normalization cooling is carried out, the initial temperature of fast cooling is 700-950 DEG C, and the fast cooling speed with the temperature of being reduced to 550 DEG C is 15-40 DEG C/sec. The production method solves the problem of difficult nitridation in the decarbonization procedure when a low-temperature plate blank heating technology is used for producing the high magnetic induction oriented silicon steel, carries out synchronous nitridation on the hot rolling plate in the normalization procedure, and leads the following procedure of decarbonization and annealing techniques to be simplified and easily controlled, thus not only being capable of obtaining a high magnetic induction oriented silicon steel product with excellent performance and simultaneously leading the production cost to be reduced.

The invention discloses a glass-film-free oriented silicon steel manufacture method. The method comprises the following steps of: (1) smelting; (2) hot rolling and normalizing; (3) cold rolling; (4) decarburization and nitriding, wherein a cold-rolled sheet is subjected to decarburization annealing treatment in wet N2+H2 protective gas at 800 to 860 DEG C, and oxidation energy is controlled within 0.16 to 0.40; carbon in the steel sheet can be reduced to below 30ppm by the decarburization annealing treatment while an oxide layer mainly containing SiO2 is formed on the surface of the steel sheet, and the single-side oxygen content of the steel sheet is controlled to below 0.7g/m<2>; and continuous nitriding treatment is carried out on the steel sheet in ammonia-contained N2+H2 protective gas with oxidation energy of 0.05 to 0.15 to control the nitrogen content of the steel sheet within 180ppm to 280ppm; (5) application of an isolation agent; (6) high-temperature annealing and temperature rising and maintenance, wherein the steel sheet is heated to 1150 to 1250 DEG C in dry N2+H2 mixed atmosphere containing 50% to 90% of N2 and H2, is maintained at the 1150 to 1250 DEG C in pure hydrogen atmosphere for above 15 hours; and (7) coating of an insulation coating, stretching, leveling and annealing, thus obtaining the grain-oriented silicon steel product with an excellent magnetic property.

The invention discloses high-magnetic strength oriented silicon steel, comprising the following components by weight percent: 0.055-0.095% of C, 2.95-3.25% of Si, 0.050-0.090% of Mn, no more than 0.01% of P, 0.010-0.025% of S, 0.006-0.010% of N, 0.05-0.5% of Cr, 0.020-0.030% of Als, 0.002-0.1% of Bi, 0.01-0.06% of Se and 0.01-0.06% of Sb. The production method comprises the following production steps: heating a casting blank; rolling, processing at normal temperature; conventionally rolling into the product by adopting a primary cold rolling method or a secondary rolling method containing intermediate annealing; decarbonizing and annealing; coating a parting compound of taking magnesium oxide as a main ingredient; annealing at high temperature by adopting secondary heat preservation, carrying out heat preservation at 800-1100 DEG C for 5-20 hours, and at 1170-1220 DEG C for 5-25 hours in a full-hydrogen atmosphere; stretching and flatly annealing; coating an insulating layer on the surface of a steel plate. The magnetic induction strength B800 of the oriented silicon steel is not lower than 1.95T by independently adding or compositely adding Sb, Se and Bi grain-boundary segregation elements, and the magnetic property is stable.

The invention discloses a preparation method and application of a modified charcoal adsorbent based on lanthanum ferrite. The preparation method comprises the following steps: S1, preparing charcoal; S2, performing modification treatment; and S3, performing finished product treatment. According to the method, low-cost and sufficient-source crop straws are adopted as a raw material; by virtue of a chemical coprecipitation method, the surface of the charcoal obtained by pyrolysis of the straws is modified with the lanthanum ferrite, so that the modified charcoal adsorbent has a favorable removal effect on pollution by phosphate anions in a water body, especially low-concentration phosphorus; furthermore, the adsorbent is favorable and stable in magnetism and convenient to recycle; in addition, the preparation method is simple to operate and high in preparation yield, and has potential application prospect in the field of inorganic wastewater treatment.

The invention discloses a magnetic carbon-based iron oxide compound material and a preparation method of the magnetic carbon-based iron oxide compound material. Particularly, the invention discloses a prepraation method of the magnetic carbon-based iron oxide compound material. The preparation method comprises the following steps of: (a) providing a mixture comprising a carbon-based precursor, elemental iron and a solvent; and (b) carrying out heating reaction on the mixture in the step (a), thus obtaining the carbon-based iron oxide compound material. The method has the advantages that materials are common and are easily available, and the process is simple, safe and effective and the like. The obtained compound material has stable magnetism, and is wide in application.

The invention discloses a monodisperse magnetic porous silicon dioxide pellet and a preparing method thereof. The preparing method of the monodisperse porous silicon dioxide pellet comprises the steps of utilizing a monodisperse magnetic porous macromolecule pellet as a template, generating in situ a magnetic Fe3O4 particle and sol-gelation of a silicon source and using a Fe3O4 particle to oxidize gamma-Fe2O3, forming a magnetic macromolecule-silicon dioxide composite pellet, and then removing the macromolecule template after calcination to obtain the monodisperse magnetic porous silicon dioxide pellet. The preparing method of the monodisperse magnetic porous silicon dioxide pellet is simple in process and easy to operate, and the prepared monodisperse magnetic porous silicon dioxide pellet has the advantages of being homogenous in particle size, controllable in particle diameter and pore diameter, connective in pore, simple in method of introducing magnetic nanoparticles, stable in magnetism and the like.

The invention discloses a soft magnetic ferrite material containing magnesium element, nickel element and zinc element, which comprises the following compositions in mol portion: 60 to 66 mol percent of ferric oxide Fe2O3, 7 to 10 mol percent of nickel oxide NiO, 7 to 10 mol percent of magnesia MgO, 10 to 15 mol percent of zinc oxide ZnO and 3 to 6 mol percent of copper oxide CuO. The manufacturing method comprises the following steps of the processing of raw material, batching, primary ball milling, drying, pulverization or sifting, preburning, secondary batching, secondary ball milling, secondary drying and secondary pulverization or sifting, in a preburning condition, the soft magnetic ferrite material is presynthesized in an air furnace at a temperature of between 800 and 900 DEG C. The prepared soft magnetic ferrite material has the initial magnetic conductivity of about 100, stable magnetic performance and low production cost when the soft magnetic ferrite material is used to produce a laminated sheet type inductor.

The invention discloses a method for preparing a bulk sintered Nd-Fe-B permanent magnet material. The method comprises the following steps of: preparing fine powder with the average particle size of 2.9 to 3.3 micrometers from raw materials which are prepared according to a required formula; adding the fine powder into a metal die cavity of a molding pressing machine; and arranging a molding magnetic field to ensure that the fine powder is prepared into a patch raw blank in a compression molding way under an electromagnetic induction oriented magnetic field. The method is characterized by comprising the following steps of: selecting at least two patch raw blanks; selecting the joint surfaces of the patch raw blanks on the premise of ensuring the consistent orientation of all patch raw blanks; clearing Nd-Fe-B attached powder on the joint surfaces of all the patch raw blanks; performing butt joint on all the patch raw blanks; putting the butt-jointed raw blanks into a die box made of rubber; performing vacuum encapsulation on the die box; keeping the pressure of an encapsulation body under the isostatic pressure of 180 to 220MPa for 8 to 13 seconds; taking the butt-jointed raw blank combination body out; transferring into a sintering basin; and sintering in a vacuum furnace to form a compact bulk Nd-Fe-B blank body. The invention has the advantages that: the bulk sintered Nd-Fe-B permanent magnet material can be produced by the conventional universal equipment, and has high precision, stable magnetic performance and low preparation cost.

The invention discloses an imido magnetic nano-adsorbent. The adsorbent is formed by covalent cross linkage of magnetic nanoparticles and polyethyleneimine, wherein the magnetic nanoparticles mainly consists of nano ferroferric oxide, and a layer of gamma-Fe2O3 particles is coated on the surface of the magnetic nanoparticles. The invention correspondingly discloses a preparation method of the adsorbent. The preparation method comprises the following steps: preparation of the magnetic nanoparticles and covalent cross linkage. The invention further correspondingly discloses an application of the adsorbent in treating heavy metal wastewater. The magnetic nano-adsorbent has the advantage of stable magnetic property in the presence of strong acid and strong alkali, and can be easily and rapidly separated from a liquid phase, thus being suitable for various operating environments; and in addition, the adsorbent can be regenerated by simple acid or alkali treatment. The preparation method of the adsorbent has the advantages of simple process and low cost; and the adsorbent can be used for realizing selective adsorption (up to almost 100%) on zinc and lead in application to treatment of the heavy metal wastewater.

The invention relates to an explosion protection device of a smelting furnace. The explosion protection device comprises a pipeline with a corner, wherein one end of the pipeline is communicated with a furnace chamber passage, and the other end of the pipeline is communicated with a smoke exhaust passage; the pipeline is provided with an explosion protection opening; the upper end of the explosion protection opening is provided with an explosion protection cover; elastic devices are arranged on the two sides of the explosion protection opening; the lower ends of the two elastic devices are fixedly connected with the pipeline, and the upper ends of the elastic devices are fixedly connected with the explosion protection cover; the edge of the upper end of the explosion protection opening is provided with a circle of seal ring; a first magnetic ring is arranged on the circle on the outer side of the seal ring; the explosion protection cover is provided with a second magnetic ring; the second magnetic ring is positioned in the corresponding upper space of the first magnetic ring. Compared with the prior art, the explosion protection device has the advantages of simple structure, stable operation, capability of automatically closing the smelting furnace and good sealing property.

Economy high magnetic induction grain-oriented silicon steel comprises the following components according to weight percent: 0.015 to 0.095 percent of C, 2.80 to 3.60 percent of Si, 0.010 to 0.015 percent of Als, 0.0050 to 0.0100 percent of N, 0.010 to 1.00 percent of Mn, 0.0030 to 0.0150 percent of S, 0.0015 to 0.100 percent of Bi, as well as P, Cu, Sn, Sb, Cr and Ar, of which the sum is no morethan 0.80 percent; a production method comprises the following steps: smelting and continuously casting to form a blank; heating the blank; carrying out segmented hot rolling; reeling; normalizing; carrying out one-step cold rolling after acid pickling; carrying out decarburizing annealing; coating a high temperature annealing isolation agent; carrying out high temperature annealing with secondaryheat insulation; stretching and smoothing, and coating an insulating coating. According to the invention, under a condition of not carrying out nitriding, steel plate magnetic induction intensity B800 is not lower than 1.930T, iron loss P17/50 is smaller than or equal to 1.08W/k, the magnetic performance is stable, and the cost is lowered by 5 percent or more by compared with that in the prior art.

The invention discloses magnetic active carbon and a preparation method thereof. The magnetic active carbon comprises the following raw materials in parts by weight: 20-30 parts of cow dung, 10-20 parts of sludge, 60-80 parts of crop straw, 20-40 parts of coal powder and 20-30 parts of magnetic materials. The preparation method comprises the following steps: cleaning, filtering and drying the cow dung and the sludge; weighing and mixing the raw materials in parts by weight, soaking the raw materials by using a KOH solution, and then washing by using distilled water until the raw materials are neutral; performing two-step microwave treatment on the treated raw materials, cooling to room temperature after activation is finished, and then taking out an activated product; washing the activated product which is taken out by using the distilled water, adding a hydrochloric acid solution, heating, and re-washing the treated activated product by using the distilled water until the treated activated product is neutral to obtain a semi-finished active carbon; and drying and grinding to obtain the active carbon. The prepared magnetic active carbon is sufficient in magnetic strength and stable in magnetic performance, has the advantages of high specific surface area, good adsorption performance and the like, and is low in cost and suitable for industrial production; the raw materials of the magnetic active carbon can be widely obtained.

A 4A zeolite molecular sieve with a certain magnetism and carrying Fe contained compound on its surface is a granular one containing Fe (3.55-9.70 mass%). Its preparing process includes such steps as synthesizing 4A zeolite molecular sieve, preparing Fe ion solution and aqueous solution of NH4, and magnetically modifying the 4A zeolite molecular sieve by chemical deposition method.

To provide a sealing device in which a magnetic encoder can be protected so as to improve detecting precision and reliability, without increasing the number of parts and assembling man-hour and without enlarging a setting space, the sealing device is structured such that a detected portion is arranged in the sealed fluid side of an annular member, a first annular member fitted to a shaft is formed with an axial direction portion and diametrical direction portions extending in the inward and outward diametrical directions from the axial direction portion, one of the diametrical direction portions supports the detected portion in the sealed fluid side, a seal lip is in slidably contact with the other diametrical direction portion for sealing, and the seal portion is formed with the seal lip and the micro space.

The invention relates to a multifunctional tourmaline health-care material and a preparation method thereof, and relates to a health-care composite material and a preparation method thereof, which solve the problem of single function in the conventional health-care material. The multifunctional tourmaline health-care material is prepared from iron tourmaline powder, neodymium iron boron powder, titanium dioxide powder, cerium oxide powder, a bonder, a coupling agent and a lubricating agent. The method comprises the following steps of: mixing the iron tourmaline powder, the neodymium iron boron powder, the titanium dioxide powder, the cerium oxide powder, the bonder, the coupling agent and the lubricating agent uniformly, pressing the mixture to form parison, and curing and magnetizing to prepare the multifunctional tourmaline health-care material. The multifunctional tourmaline health-care material also can be prepared from the iron tourmaline powder, the neodymium iron boron powder, the titanium dioxide powder, the cerium oxide powder and viscose fiber slurry, and the method comprises the following steps of: adding the iron tourmaline powder, the neodymium iron boron powder, the titanium dioxide powder and the cerium oxide powder into the viscose fiber slurry, mixing uniformly, and after performing wire drawing, spinning and weaving, magnetizing to prepare the multifunctional tourmaline health-care material. The multifunctional tourmaline health-care material releases negative ions, far infrared rays, magnetic fields and microcurrent, and can be used for preparing health-care products.