18 results about "Magnetic powder" patented technology

The invention relates to a yarn separating mechanism for a yarn separating machine, and belongs to the technical field of textile machines. The mechanism comprises a base with an upright post, upper and lower yarn guide rollers, a yarn isolating comb, a magnetic powder brake, first and second driving wheels, a limit roller frame and a terminal yarn conveying roller, wherein a guide rail bracket is arranged on the right side of the base and provided with a group of yarn bundle guide rollers; the upper and lower yarn guide rollers and the yarn isolating comb are arranged on the upright post; a group of yarn isolating rollers extend from the yarn isolating comb; the magnetic powder brake is arranged on the left side of the base; a magnetic powder brake power output shaft of the magnetic powder brake is fixedly provided with a magnetic powder brake driving wheel; the second driving wheel is fixed on a lower yarn guide roller shaft; the first driving wheel is fixed on an upper yarn guide roller shaft; the limit roller frame is fixed at the upper end of the upright post and provided with a pair of limit rollers; a yarn passing channel is formed by a gap between the pair of limit rollers; the terminal yarn conveying roller is arranged on the upper part of the upright post through a pivot; the upper and lower yarn guide rollers are positioned on one side of the upright post; and the first and second driving wheels are positioned on the other side of the upright post. The occupied area can be saved; the mechanism is suitable for separating a yarn bundle into single yarns in textile industry and has a high generalization degree; and using cheapness is reflected.

The invention belongs to field of magnetic powdery material, specially the highly saturation intensity ferriferrous oxide magnetic powder and its producing method and usage. The invention adopts polymorphic inversion single stage method to produce ferriferrous oxide magnetic powder which possesses perfect dispersity, magnetic saturation intensity is above 85emu/g, particle diameter is 0.15-0.4 mum, coercitive force is smaller than 35Oe, surface area is 5-8m2/g. The ferriferrous oxide produced is oxygenized or deacidized further to produce gamma-di-iron trioxide and alpha-Fe magnetic powder which possesses perfect dispersity, coercitive force is big, saturation intensity is high. The magnetic powder can be used widely in fields of digit copy powder, magnetic recording material and medical magnetic powder.

The application of the invention belongs to the technical field of processing equipment for punching automation and in particular discloses pipe punching equipment. The pipe punching equipment comprises a punching head, an electromagnet, a support column and a fixing device, wherein the electromagnet is located below the punching head, and the fixing device is located between the punching head and the electromagnet; a through hole is formed in the axial direction of the punching head, and a propping block used for propping punching hole scraps on a pipe is arranged on the inner side wall of the through hole; the fixing device comprises a positioning block, a magnetic powder bag for accommodating magnetic powder, a telescopic rod and a support unit which is matched with the inner diameter of the pipe, the positioning block is fixed on the support column, and the telescopic rod is connected between the positioning block and the support unit; an arc-shaped groove is formed in the support unit, an arc-shaped friction plate which is matched with the arc-shaped groove is arranged on the arc-shaped groove, and a cutter head used for crushing the punching hole scraps is arranged at the bottom of the arc-shaped groove. By adopting the pipe punching equipment to punch the pipe, the deformation of the pipe can be effectively avoided while punching, and burrs are molten generated when the pipe is punched, so that orifices are smoother.

The invention discloses a magnetic powder sensitivity test device and test method used for flaw detection. The device includes a cylinder, the cylinder has two planes, at least one plane is provided with a plurality of quenching cracks and a plurality of grinding cracks, and the cylinder has a circular middle hole. The method includes the following steps: 1, preparation of magnetic powder, a dispersing agent, a defoaming agent, an anti-rust agent and the magnetic powder sensitivity test device; 2, magnetic powder solution preparation, wherein 10 ml +/- 1 ml of the dispersing agent and then 5 g +/- 0.5 g of the magnetic powder are added in 100-300 ml of water so as to make the magnetic powder dispersed into water, then 10 ml +/- 1 ml of the anti-rust agent and 15 ml +/- 1 ml of the defoaming agent are added, and the water is added until the volume is 1000 ml +/- 5 ml to form a magnetic suspension liquid; 3, spraying the magnetic suspension liquid on the magnetic powder sensitivity test device for 3-5 seconds; 4, evaluation, wherein the display situation of the magnetic powder on the quenching cracks and the grinding cracks of the magnetic powder sensitivity test device is observed and compared with an original display situation. The magnetic powder sensitivity test device and test method have the advantages of being rapid, accurate, convenient to use and low in cost.

The invention discloses an engine crankshaft inspection method, which comprises the following steps of: performing magnetic powder inspection on an engine crankshaft by using a continuous method, and judging that the engine crankshaft without magnetic traces on the surface is qualified; judging the magnetic mark position of the engine crankshaft with the magnetic marks on the surface; if the magnetic trace exists on the parting surface (i) or the parting surface and the non-parting surface (ii), judging the shape of the magnetic trace; if the magnetic traces are fibrous, removing magnetic powder, and then using a residual magnetism method for conducting magnetic powder inspection on the engine crankshaft; and if no magnetic trace is found by using the residual magnetism method, determining that the type of the magnetic trace is a streamline type magnetic trace, and determining that the engine crankshaft is qualified. After the engine crankshaft sorted by the inspection method is loaded and used, the fatigue resistance can be comparable with that of a qualified product judged by an existing method, the reliability is high, and no use risk exists in loading. For the same batch of engine crankshafts, the rejection rate in the prior art is more than 10%, and the rejection rate of the test method is only 0.05%, so that the misjudgment rate is greatly reduced.

The present invention relates to a device for performing fatigue testing on a steel hole belt, and belongs to the field of mechanical engineering. In order to test the fatigue life of the steel hole belt, the present invention discloses a testing device for a fatigue life of the steel hole belt. The technical scheme is that: a driving wheel end of the steel hole belt is driven by a motor to drivethe steel hole belt to rotate, a magnetic powder brake is used to adjust the load force on the steel belt, and a counting sensor is used to record the number of rotations of the steel belt from the beginning to the fatigue fracture. The testing device for the fatigue life of the steel hole belt has the following advantages that: (1) a position adjustment mechanism can be used to adjust a distancebetween two transmission wheels, and the steel hole belts of different lengths can be tested; (2) the magnetic powder brake can be used to adjust the load force on the steel hole belt, and steel holebelts with different fatigue strength can be effectively simulated for testing; and (3) the structure is simple, the disassembly is convenient, and inspection and maintenance are facilitated.

The invention provides a preparation method of high-resistance flaky soft magnetic powder. The method comprises the following steps of providing an oxidizing atmosphere by using a mixed gas containingoxygen, and keeping the temperature of the flaky soft magnetic powder at 100-250 DEG C for 10-60 minutes in a reaction region filled with the mixed gas so as to carry out a vapor deposition reaction,thereby forming an oxide film on the surface of the flaky soft magnetic powder, and in the vapor deposition reaction process, keeping the flaky soft magnetic powder in a suspension motion state in the reaction area. The flaky soft magnetic powder in a suspension motion state can be in full contact with an oxidizing atmosphere in a dispersed state; therefore, a complete and uniform oxide film canbe formed on the surface of the flaky soft magnetic powder; the related vapor deposition reaction is mild in reaction condition and high in controllability, the thickness of the oxide film can be accurately controlled by controlling the heat treatment process and the oxygen partial pressure, use of a large number of reagents is not involved, operation is easy and convenient, and the method is suitable for large-scale production and has the high environment-friendly degree.

The invention relates to the field of plastic masterbatch, and discloses a graphene magnetic injection molding masterbatch for nylon electrical appliance plastics, and a preparation method thereof. The preparation process comprises: (1) adding sulfonated graphene, an iron salt and a ferrous salt to deionized water, and carrying out a hydrothermal reaction to obtain graphene-Fe3O4 nanometer composite magnetic micro-particles; (2) carrying out surface treatment on the composite magnetic micro-particles, adding nylon 6 and a dispersant, and carrying out melt extrusion to obtain a nylon 6 melt; and (3) mixing melt, polyamide-amine, adipic acid and hexanediamine, carrying out a condensation polymerization, carrying out pressure relief, drying, and crushing to prepare the graphene magnetic injection molding masterbatch. According to the present invention, the nanometer composite magnetic micro-particles are coated with the hyperbranched nylon 6 with characteristics of good compatibility withthe nylon injection molding matrix and high fluidity, such that the dispersibility of the magnetic powder in the nylon is substantially improved, the melt has good fluidity, the processing performance is excellent, and the method is suitable for popularization and application.

The invention belongs to the technical field of permanent magnetic ferrite, and discloses an anisotropic permanent magnetic ferrite and a preparation method thereof. The preparation method comprises the following steps: (1) adding polyvinyl alcohol water to obtain a polyvinyl alcohol dilute solution, wherein the ratio of polyvinyl alcohol in the polyvinyl alcohol dilute solution is 0.1-2 wt%; (2)adding ferrite magnetic powder into the polyvinyl alcohol dilute solution, stirring and mixing to obtain slurry, wherein the mass ratio of the ferrite magnetic powder to the polyvinyl alcohol dilute solution in the slurry is 3: (1.2-3); (3) drying the slurry at a low temperature of 70-80 DEG C, crushing after drying, adding a lubricant, stirring and dispersing to obtain anisotropic permanent magnetic ferrite powder; and (4) placing the anisotropic permanent magnetic ferrite powder in a magnetic field, and carrying out dry pressing molding, sintering and grinding to obtain the anisotropic permanent magnetic ferrite. The anisotropic permanent magnetic ferrite product prepared by the preparation method is excellent in molding effect and magnetic comprehensive performance.

The invention discloses a preparation method of a rubber sealing material containing nano-magnetic powder modified montmorillonite. The prepared rubber sealing material has high tensile resistance andtearing resistance and is low in permeability coefficient and good in sealing performance, the tensile strength of the rubber sealing material is reduced at slow speed during corrosion of H2S solution, the retention rate of the tensile strength is still about 98% 20 days after, and the corrosion resistance is excellent. Nano-scale ferroferric oxide powder is modified by the aid of polyacrylic acid, on one hand, aggregation of the nano-scale ferroferric oxide powder is improved, so that the nano-scale ferroferric oxide powder can be uniformly distributed in rubber base, the powder has magnetism, distribution of carbon black can be affected, and the dispersing performance of the carbon black is improved under the action of a magnetic field, so that the mechanical property and the corrosionresistance of a target material are remarkably improved.

A vacuum high-low temperature composite loading device comprises vacuum high-low temperature circular mold equipment, a driving mechanism, a loading lever, a bearing assembly, a coupler, a switching supporting seat, a torque sensor, an inertia load and a magnetic powder brake. The vacuum high-low temperature circular mold equipment with a magnetofluid sealing shaft can realize the vacuum environment simulation of the mechanism. At the output shaft end of the driving mechanism, a loading lever which is supported by a space solid lubrication bearing is adopted, so that the acting force at the shaft end is applied. Torque loading equipment connected with a mechanism output shaft through a magnetofluid sealing shaft is adopted outside the vacuum high-low temperature circular mold equipment. An inertia load loading device connected with the mechanism output shaft through the magnetofluid sealing shaft is adopted outside the vacuum high-low temperature ring mold equipment. In the vacuum high-low temperature environment, the device can simultaneously simulate a moment load, an inertia load and a shaft end acting force, and can accurately apply a load to a mechanism product in the vacuum circular mold equipment in a limited space.

The invention discloses an iron element control method for a martensitic stainless steel 2Cr13 blade. The iron element control method comprises the following steps of wax piece manufacturing, wax piece combining, mold shell manufacturing, smelting and pouring, shell cleaning and cutting, component testing, primary repairing, magnetic powder processing, X-ray inspection, annealing and primary correction, heat treatment (solid solution and aging treatment), internal structure detection and fine repairing. According to the iron element control method, the iron content can be effectively reduced to about 1%; an internal structure result meets the requirements, chemical components of a casting meet the requirements through detection, the mechanical properties of a body meet the requirements through detection, the surface quality of the casting is subjected to magnetic powder inspection, and a detection result meets the GB/T9444 01-level requirement; the internal quality of the casting is subjected to ray inspection, the detection result meets the requirements of GB/T 5677 and ASTM E446, and the class A, the class B, the class C and the class D discontinuously meet the first-level requirement.

The invention discloses a warm keeping bag. The warm keeping bag is composed of a warm keeping bag body and heat storage materials surrounded by the warm keeping bag body in a sealed mode. The warm keeping bag can be heated externally and is sealed. The heat storage materials of the warm keeping bag are composed of water, grease, magnetic powder and electric conduction metal powder, and can be heated by heat sources such as an external induction cooker, a microwave oven and an infrared bulb or be heated by being exposed in the sun, and then the heat storage materials can reach the needed temperature. The sealed warm keeping bag is not provided with a circuit, so that no circuit fault occurs; weak links such as filling holes and electric connectors do not exist, so that water filling and air exhaust are not required. The sealed warm keeping bag which is heated by the external heat sources has the advantages of being simple in structure, low in price, safe, reliable, long in service life, convenient and comfortable to use, capable of being widely used for living heating and medical care, and the like.