3965 results about "Magnetic powder" patented technology

The invention belongs to the technical field of soft magnetic materials, and discloses an amorphous nanocrystalline soft magnetic material with high saturation flux density and a preparation method thereof. The preparation method comprises the following steps that an iron-based amorphous strip is crushed into flat powder with the thickness being 5-25 microns and the diameter being 30-80 microns, and scaly amorphous soft magnetic powder is obtained; the method comprises the following steps: performing insulation coating treatment on spherical iron-silicon soft magnetic powder with the average particle size of 2-20 microns to obtain insulation coating modified spherical magnetic powder; and mixing the obtained scaly amorphous soft magnetic powder, the insulating coated modified spherical magnetic powder and bonding resin, performing compression molding, performing annealing crystallization treatment at the temperature of 450-550 DEG C, and then raising the temperature to 600-900 DEG C for sintering treatment to obtain a finished product. According to the amorphous nanocrystalline soft magnetic material and the preparation method thereof, the spherical iron-silicon soft magnetic powder modified through insulation coating is compounded with the scaly amorphous soft magnetic powder, and low loss is maintained while the obtained amorphous nanocrystalline soft magnetic material Bs is remarkably improved.

The invention relates to a bionic multi-finger underwater manipulator device, a control system, a grabbing strategy and a target identification method.The manipulator is mainly composed of a flange plate and an under-actuated mechanical finger of a seven-connecting-rod mechanism, and the mechanical finger comprises a base, a triangular piece, a fingertip piece and a sliding block; two corners of the triangular piece are connected with the fingertip piece and the sliding block through connecting rod mechanisms respectively, the third corner of the triangular piece is connected with the base through a trapezoidal connecting piece, the sliding block is driven by a threaded linear long-axis motor, a magnetic touch sensor is arranged in a fingertip, and the magnetic touch sensor receives fingertip touch information through a fingertip receptor unit made of a magnetic powder silica gel mixture. The device is controlled by a control system comprising a microprocessor, naturally adapts to objects with different shapes and sizes by formulating corresponding adaptive force grabbing strategies, and classifies and identifies underwater objects through a deep learning algorithm. Compared with the prior art, the method has the advantages of high sensitivity, interference resistance and the like, and has the capabilities of tactile perception recognition and self-adaptive grabbing.

The invention discloses a method for synchronously reducing hysteresis loss and eddy-current loss of a FeSiAl magnetic powder core, which comprises the following steps: preparing a salt solution of metal M which is low-melting-point metal with atomic radius unequal to that of Al atoms and can form a replacement solid solution with Al; adding the salt solution into the FeSiAl magnetic powder core, drying to obtain an insulated and coated magnetic powder core, and then adding a binder and a lubricant to prepare magnetic powder to be formed; and performing compression molding on the to-be-molded magnetic powder, and performing heat treatment to obtain the magnetic powder core. The low-melting-point M atoms are diffused into the FeSiAl matrix and occupy Al vacancies, lattice distortion can be reduced in the annealing process, and therefore coercive force and magnetic hysteresis loss are reduced; more importantly, after the FeSiAl is doped with the M atoms, the resistivity of the matrix is increased, eddy-current loss in the particles can be effectively inhibited, meanwhile, the Al2O3 coating layer generated through in-situ oxidation can effectively isolate the eddy-current loss among the particles, and therefore the magnetic hysteresis loss and the eddy-current loss are synchronously reduced through the method.

The invention discloses an efficient chemical liquid phase coating method of metal soft magnetic powder and application, and belongs to the technical field of preparation of soft magnetic materials, aluminum isopropoxide is dissolved to form a coating precursor solution, and an Al2O3 insulation coating layer is formed on the surface of the fluidized metal soft magnetic powder after hydrolysis and dehydration reactions. The aluminum isopropoxide is dissolved to form gel, the gel is uniformly mixed with the fluidized metal soft magnetic powder, dried gel can be formed on the surface of the metal soft magnetic powder after high-temperature airflow drying, and the dried gel is further calcined and dehydrated to form the high-insulativity Al2O3 coated metal soft magnetic powder. The method can be widely applied to surface insulation coating of the metal soft magnetic powder, has the characteristics of controllable coating layer thickness, simplicity, rapidness and high coating efficiency, and meets the requirements of industrial production such as large-scale, low-cost, safe and environment-friendly industrial production.

The invention discloses a nano metal oxide insulating material coated soft magnetic composite material and a preparation method thereof, and the preparation method comprises the following steps: (1) putting metal soft magnetic powder and a nano metal oxide insulating material into a steel cylinder equipped with a rotating blade, and rotating the blade to drive the raw material to flow to obtain core-shell composite powder; (2) carrying out annealing treatment on the core-shell type composite powder to obtain a precursor; and (3) mixing the precursor and a lubricant, then pressing the mixture into a green body, and carrying out annealing heat treatment on the green body in a protective atmosphere to obtain the soft magnetic composite material. The prepared soft magnetic composite material is uniform in insulating layer and high in coverage rate, the binding force between the nano metal oxide and the metal soft magnetic matrix is high, the thickness of the coating layer is controllable, the obtained soft magnetic composite material has high magnetic conductivity and lower loss, and the insulating coating method is mild in process condition, simple in equipment, short in coating treatment time, high in efficiency, low in cost and suitable for industrial production. The method is suitable for large-scale production.

The invention discloses a nondestructive testing device for a steel profile and a testing method of the nondestructive testing device. According to the method disclosed by the invention, the ultrasonic technology is combined with optical imaging, so that synchronous detection of surface and internal defects can be completed at one time. Ultrasonic waves penetrate through the interior of the steel profile, and hidden defects such as cracks and air holes are accurately recognized; the optical camera module captures visible problems such as surface scratches and corrosion in real time. The integrated detection mode avoids the tedious process of step-by-step operation required by a traditional method, for example, magnetic powder detection of surface defects and ultrasonic scanning of an internal structure are not needed, the detection period is greatly shortened, and the method is especially suitable for steel structure buildings, bridge engineering and other scenes with high requirements for detection efficiency and has good application prospects. The full-process automatic design effectively reduces the influence of human intervention, and ensures the scanning continuity of the detection area; the intelligent algorithm automatically analyzes the ultrasonic echo signal and the optical image data, and judges the defect level according to the preset standard, thereby avoiding subjective misjudgment of manual visual inspection.

The invention discloses a preparation method of low-loss high-saturation iron-nickel soft magnetic powder. Comprising the following steps of S1, alloy smelting and S2, atomization. S3, carrying out ball milling treatment; s4, annealing treatment; s5, carrying out surface coating; the low-loss high-saturation iron-nickel soft magnetic powder is prepared from the following raw materials in percentage by weight: 77.6%-78.2% of electrolytic nickel, 21.4%-22.3% of electrolytic iron and 0.1%-1% of an additive, the performance of the iron-nickel soft magnetic powder and a magnetic powder core prepared by the process is improved in multiple aspects, and the iron-nickel soft magnetic powder has great application advantages.

The invention discloses a self-adaptive adjustment method and system for twisting tension of a copper stranded wire. According to a state analysis result, a dynamic coupling adjustment mechanism is started, rapid response adjustment of tension is achieved by adjusting the matching relation between the rotating speed of a stranding cage and the linear speed of a traction wheel and linkage with the exciting current of a magnetic powder brake, tension data are rapidly collected through a sensor, and after filtering and abnormal value processing, the tension is obtained. The fluctuation frequency and amplitude are analyzed immediately, and adjustment is started once the fluctuation frequency and amplitude exceed a set range. During adjustment, the ratio of the rotating speed of the stranding cage to the speed of the traction wheel is adjusted, the current of the magnetic powder brake is linked, mechanical adjustment and electromagnetic braking are matched, and the response speed is much faster than that of traditional single-parameter adjustment. Therefore, the stress of the copper stranded wire in the stranding process is uniform, the wire diameter is not thinned or burrs are not formed on the surface due to sudden change of tension, the stranded wire pitch is uniform, the process requirement is met, and the influence on the stranded wire quality due to sudden change of the tension is avoided as much as possible.

The invention discloses a method for replacing a ship rudder horn, which comprises the following steps of: measuring rudder blade gap data, measuring old rudder horn data as an original record, so that a new rudder horn is measured and compared again after being installed, and a center line of a guyed rudder system is established; hoisting a new rudder horn in place, adjusting the position of the rudder horn by taking the center line of the steering engine as a reference, assembling the new rudder horn and a ship body structure together, symmetrically welding, and performing ultrasonic flaw detection and magnetic powder flaw detection on a welding seam; boring the new rudder horn by taking the center line of the guyed rudder system as a reference; and a rudderstock lower cloth and a rudder pintle cloth of the rudder horn are machined, and the steering engine, the rudder blade, the rudderstock and the rudder pintle are installed back. According to the replacement method of the ship rudder horn, the parameters of the old rudder horn are collected to serve as the positioning parameters of the new rudder horn, accurate replacement of the rudder horn can be achieved, accurate folding of the replaced new rudder horn and the ship body is facilitated, and the installation accuracy of the rudder horn can be improved by establishing the center line of the guyed rudder system.

The invention relates to a high-frequency and high-performance iron-nickel alloy magnetic powder core and a preparation method and application thereof, belongs to the field of metal magnetic powder cores, and solves the problems that in the prior art, when a metal magnetic powder core is applied at high frequency, high magnetic conductivity, high magnetic conductivity stability and high quality factor are difficult to consider, and the saturation flux density is low. And the preparation process is tedious. The invention discloses a preparation method of a high-frequency high-performance iron-nickel alloy magnetic powder core. The preparation method comprises the following steps: S1, preparing raw materials; s2, performing pretreatment; s3, the pretreated iron-nickel alloy powder and nano SiO2 powder are blended, and inorganic insulation coating powder is obtained; s4, adding the inorganic insulating coating powder into a first coating agent to obtain inorganic and first organic insulating coating powder; s5, adding the inorganic and first organic insulation coating powder into a second coating agent to obtain inorganic and double-layer organic insulation coating powder; and S6, compression molding. The comprehensive magnetic performance of the iron-nickel magnetic powder core is improved, and the preparation process is simplified.

The invention relates to the technical field of inductors, in particular to an inorganic insulation integrally-formed power inductor and a preparation method thereof. The method comprises the following steps: S1, selecting a coil; s2, pre-stretching the coil; s3, pre-coating of inorganic powder is carried out; s4, pressing the magnetic powder; s5, sintering the ceramic layer at high temperature; and S6, integrally forming the inductor. By reasonably selecting the material and shape of the coil and the type of the magnetic powder and combining high-temperature sintering at the temperature of 250 DEG C or above, the magnetic conductivity and the bias resistance are improved, the diversified requirements of high frequency, high temperature, high power density and the like are met, and the performance of insulation, heat conduction and the like can be optimized; according to the integrated forming process, coil pre-packaging and magnetic core forming are completed in one step, production procedures are reduced, process integration and production efficiency are improved, production cost is reduced, the utilization rate of a magnetic core window reaches 100%, and the product size is reduced.

The invention relates to multifunctional self-adaptive laser metal 3D printing equipment and a control method thereof.The device comprises a spray head bottom plate and a laser cladding spray head, the laser cladding spray head comprises a spray nozzle used for outputting powder and a pipeline connected to the spray nozzle and used for conveying the powder, and a first converging assembly is installed on the spray head bottom plate; the end, away from the nozzle, of the pipeline is arranged on the inner side of the first gathering assembly, the powder is magnetized when passing through the first gathering assembly in the pipeline, and a gathering processing assembly used for repelling the magnetic powder is arranged on the outer side of the nozzle. Through the design of the first gathering assembly and the gathering processing assembly, powder is magnetized through the first gathering assembly during conveying, then the magnetized powder and the gathering processing assembly generate like-pole repulsion acting force when the powder is sprayed out of the nozzle, the powder is promoted to be gathered together to form a powder beam, powder divergence and irregular arrangement are reduced, and the powder quality is improved. And the position precision and the forming quality and precision of powder conveyed to the molten pool are improved.

The invention belongs to the field of rare earth magnetic materials, and particularly relates to a rare earth high-entropy alloy, an annular magnet and a preparation method of the rare earth high-entropy alloy. The invention discloses a rare earth high-entropy alloy, the component of which is (HEA-Re) 2Fe14B, HEA-Re is more than four of rare earth elements La, Ce, Pr, Nd, Y, Gd, Ho, Dy and Tb, and the content proportions of the rare earth elements are the same; meanwhile, the invention discloses a preparation method for preparing the annular magnet by adopting the rare earth high-entropy alloy through the steps of smelting, solution rapid quenching, annealing heat treatment, magnetic powder preparation, magnet pre-forming, hot pressing, thermal deformation and the like, and the prepared annular magnet. According to the annular magnet prepared through the components and the method, the magnetic performance and the mechanical performance are obviously improved, the content of high-price rare earth elements is reduced, and the cost is effectively saved.

The invention discloses a method for preparing anisotropic samarium-iron-nitrogen magnetic powder, and belongs to the technical field of magnetic materials, the method comprises the following steps: preparing Sm and Fe according to design components, and smelting to obtain samarium-iron alloy molten steel; casting the samarium-iron alloy molten steel onto a cooling roller to obtain an iron-samarium alloy sheet; the iron-samarium alloy sheet is placed in a vacuum heat treatment furnace to be subjected to homogenization treatment, the alloy sheet obtained after homogenization treatment is cooled to 200-300 DEG C, in the vacuum environment, hydrogen is introduced into the furnace, the absolute pressure of the hydrogen is controlled to be 0.05-0.1 MPa, and hydrogenation treatment is conducted for 2 h; after hydrogenation is completed, the temperature is increased to 400 DEG C, nitrogen is introduced to 0.5 MPa, the temperature is increased to 530 DEG C, then the furnace temperature is reduced to the room temperature, and the anisotropic samarium-iron-nitrogen magnetic powder is obtained.The preparation method of the samarium-iron-nitrogen magnetic powder has the advantages of being simple in preparation process, low in energy consumption, high in production efficiency, small in magnetic powder particle size, high in magnetic performance and good in magnetocrystalline anisotropy.

The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. The ferromagnetic powder is a hexagonal ferrite powder, tilt cos θ of the hexagonal ferrite powder with respect to a surface of the magnetic layer, which is acquired by cross-sectional observation performed using a scanning transmission electron microscope, is 0.85 or more and 1.00 or less, and standard deviation σ of the cos θ in a width direction of the surface of the magnetic layer is 0.03 or less.

According to the preparation method and application of the metal soft magnetic composite material, the surface of the metal soft magnetic powder is coated with the metal oxide insulating layer through the ALD technology, then the characteristics that the ferrite phase layer is high in resistivity, low in loss and good in high-frequency characteristic are utilized, insulating coating is conducted on the surface through the ALD technology, and the metal soft magnetic composite material is obtained. And a ferrite coating layer is formed on the surface of the metal soft magnetic powder during high-temperature annealing, so that electric contact among particles is blocked, the resistivity of the soft magnetic material is improved, and the eddy-current loss at high frequency is reduced, thereby improving the high-frequency performance.

The invention relates to the technical field of magnetic materials, in particular to a ferrite neodymium iron boron composite magnetic material and a preparation method thereof. The ferrite neodymium iron boron composite magnetic material comprises the following raw materials in parts by weight: 20-30 parts of ferrite magnetic powder, 40-50 parts of neodymium iron boron magnetic powder, 5-10 parts of silicon dioxide, 2-5 parts of carbon nanotubes, 0.5-1 part of polyethylene and 0.5-2 parts of polyimide. The high-temperature-resistant and corrosion-resistant permanent magnet has high magnet performance and also has high-temperature-resistant performance and corrosion-resistant performance.

The invention discloses a motor coil winding device and method, and belongs to the technical field of motor manufacturing, the motor coil winding device comprises a winding machine body, the upper surface of the winding machine body is fixedly connected with a pair of supporting plates, and the outer surfaces of the supporting plates are provided with self-adaptive floating wire protection assemblies; a wire dynamic regulation and control assembly is installed on the upper surface of the winding machine body, a fixing piece is installed on the upper surface of the winding machine body, and a winding displacement quality sensing assembly is installed on the portion, close to the fixing piece, of the upper surface of the winding machine body. The magnetorheological fluid in the magnetorheological fluid damper rapidly changes the rheological property under the action of a real-time control magnetic field, vibration transmission is effectively restrained, the phenomenon that a wire is broken due to too large tension is avoided, when it is monitored that the tension is too small, the magnetic powder brake increases the resisting moment and slows down the rotating speed of the pay-off reel to improve the tension, and if the tension is too large, the magnetic powder brake stops working. The magnetic powder brake reduces the resistance moment and accelerates the pay-off, and ensures that the wire is always at the optimal traction angle.

The invention discloses a neodymium-iron-boron quick-setting casting sheet, neodymium-iron-boron magnetic powder and a preparation method. The neodymium iron boron quick-setting casting piece is provided with a roller attaching surface and a free surface, and the neodymium iron boron quick-setting casting piece is composed of a Re2Fe14B main phase and an intergranular Re-rich phase and does not contain an alpha-Fe phase; the main phase has a columnar crystal morphology along the section in the direction from the roller attaching surface to the free surface, the width of the columnar crystal is 2.5-3.7 microns, dendritic crystals are distributed on the two sides of the columnar crystal, the width of the dendritic crystals is close to the width of the columnar crystal, Re-rich phases are attached to the two sides of the columnar crystal and the two sides of the dendritic crystals, and the Re-rich phases are uniformly distributed along the columnar crystal and the dendritic crystals. The neodymium-iron-boron quick-setting casting piece is beneficial to improving the yield of neodymium-iron-boron magnetic powder and improving the normal distribution of the granularity of the neodymium-iron-boron magnetic powder.

The invention discloses a metal soft magnetic powder core and a preparation method thereof.The preparation method comprises the steps that cold sintering is conducted, under the ultrasonic-assisted condition, warm-pressing is conducted on mixed powder containing modified iron powder and a release agent, and a metal soft magnetic powder core green body is obtained; wherein the modified iron powder comprises iron powder and a coating layer, the surface of the iron powder is coated with the coating layer, and the coating layer comprises copper, hydrated ferric oxalate, hydrated cupric oxalate and iron oxide; and heat treatment is conducted, specifically, the metal soft magnetic powder core green body is subjected to heat treatment under the oxygen-containing condition, and the metal soft magnetic powder core is obtained. Ultrasonic assistance is introduced when the modified iron powder is subjected to cold sintering, and a mixed insulation coating layer of ferric oxide and copper oxide can be generated on the surfaces of powder particles in situ during heat treatment, so that the compactness, the strength, the resistivity and the magnetic conductivity of the magnetic core are improved while the pressing force is reduced and the pressing efficiency is improved.

The invention discloses a magnetic integrated transformer design method and device for a CLLC converter, relates to the technical field of high-frequency transformer design, and aims at solving the technical problem that an existing magnetic integrated transformer design method for the CLLC converter is poor in design precision. The method comprises the following steps: based on a preset transformer magnetic circuit model, a preset area product method and preset constraint conditions, determining the total number of turns of primary and secondary winding coils, the number of turns of the primary and secondary winding coils distributed to left and right side columns and the length of left and right side magnetic powder core magnetic columns, further obtaining the magnetic resistance of a magnetic flux branch, and considering the magnetic flux effect of an air gap edge. The accurate air gap length is determined, the magnetic resistance at the corner of the magnetic core and the extra leakage inductance value in air near a winding coil are fully considered, the primary side leakage inductance in a target magnetic core magnetic circuit, the total amount of the target air extra primary side leakage inductance and the magnetic powder core material magnetic conductivity of the target left and right side magnetic powder core magnetic columns are determined, and then a preset coil winding mode is combined. A magnetic integrated transformer for a CLLC converter is designed.

The invention relates to the technical field of mutual inductor production, in particular to a coil winding device for mutual inductor production. The coil winding device comprises a rack and a winding wheel, the winding wheel is rotationally supported on the rack through a plurality of supporting wheels, the winding wheel is provided with a C-shaped notch used for containing an iron core, and the winding wheel comprises a middle ring and side rings located on the two sides of the middle ring; the side rings and the middle ring are coaxial and are arranged in a mutually rotating mode, the circumferential wall of the middle ring is used for winding a copper wire, and one side ring is provided with a wire penetrating ring used for penetrating the end of the copper wire. The tensioning assembly is used for clamping the copper wire between the iron core and the threading ring; the magnetic powder brake is connected to the supporting wheel and provides resistance for the middle ring through the supporting wheel so as to tension the copper wire; and the driving assembly is used for driving the side ring to rotate and winding the copper wire on the iron core. Resistance is provided by the magnetic powder brake through the middle ring of the reel, so that tensioning of a copper wire can be controlled, and the winding quality of the copper wire on an iron core is improved.

The invention discloses a high-sensitivity tactile sensing system based on a magnetic cilia array, a sensor comprises the magnetic cilia array and a sensor array, and the magnetic cilia array is attached to the upper surface of the sensor array; the magnetic cilia array comprises a substrate and cilia structures which are orderly arranged and fixed on the substrate; the cilia structure is made of ecological silicone rubber mixed with magnetic powder, and a plurality of groups of sensors are adopted to form a sensor array to construct a sensing system. By optimizing the magnetization process, uniform distribution of the magnetic particles in each cilium is ensured, and the output stability and sensitivity of the sensor are improved; meanwhile, the multi-sensor array layout is adopted, and high-precision sensing of multi-dimensional tactile information such as pressure, direction and vibration is achieved.

The invention discloses a magnetic biochemical integrated intensive efficient treatment system and a treatment process thereof, and relates to the technical field of sewage treatment. The treatment system comprises an intelligent magnetic powder feeding system, a magnetic biochemical system, a magnetic precipitation system, a sludge hydrolytic acidification system and a magnetic powder recovery system, wherein the magnetic biochemical system comprises a magnetic anaerobic tank, a magnetic anoxic tank and a magnetic aerobic tank; the magnetic precipitation system comprises an activated carbon tank, a magnetic coagulation tank, a magnetic flocculation tank and a magnetic precipitation tank; to-be-treated sewage is subjected to nitrogen and phosphorus removal through the magnetic biochemical system, then enters the magnetic coagulation tank and the magnetic flocculation tank to react with PAC and PAM and finally enters the magnetic sedimentation tank, magnetic powder and activated sludge of one part of settled sludge flow back into the magnetic anaerobic tank, the magnetic powder and residual sludge of the other part of settled sludge are separated, the separated magnetic powder enters the magnetic anaerobic tank to participate in the reaction, and the magnetic powder enters the magnetic flocculation tank to react with the magnetic flocculation tank. And residual sludge enters a sludge hydrolysis acidification system. The system has the technical advantages of being convenient to operate and manage, reducing the occupied area and saving the energy consumption and the chemical consumption.

Provided is a powder magnetic core that can reduce carbon dioxide emissions generated during the manufacture of the powder magnetic core. [Solution] A powder magnetic core comprising recycled powder having an insulating film on the surface of soft magnetic particles, the recycled powder being soft magnetic powder obtained by pulverizing used powder magnetic cores.

The utility model discloses a precise fine-tuning tool rest for an ultra-precise lathe, which comprises a base and a fixing frame, and a tool containing groove is arranged on the side wall of the fixing frame. According to the device, the first rotating rod is driven to rotate by rotating the knob, the second rotating rod is driven to rotate through the worm and the worm gear when the first rotating rod rotates, and the sliding block can be driven to move axially along the second rotating rod through the threaded connection relation between the second rotating rod and the sliding block when the second rotating rod rotates, so that the function of adjusting the height of a cutter mounted in the cutter mounting groove is achieved; through two-stage transmission among a worm gear, a worm, a second rotating rod and a sliding block, nanoscale fine adjustment of height adjustment of the cutter can be achieved, knurls and a flexible tensioning ring which are used for increasing friction force are arranged between the first rotating rod and a support, the first rotating rod cannot rotate when a rotary knob is not touched, and the cutter can be conveniently and rapidly adjusted. After adjustment is completed, the magnetic powder clutch is powered on to lock the radial position of the second rotating rod, and the braking effect is achieved.

The invention provides an environment-friendly fabric printing and dyeing wastewater treatment system and method, and belongs to the technical field of wastewater treatment. An environment-friendly fabric printing and dyeing wastewater treatment system at least comprises a water storage tank, two flocculation tanks, two sedimentation tanks, a transition tank, an oxidation tank, a secondary sedimentation tank, a BAF tank, a disinfection tank and a discharge tank which are connected in sequence, the two flocculation tanks are connected to the water storage tank at the same time, the two sedimentation tanks are connected to the two flocculation tanks in a one-to-one correspondence mode, and the two sedimentation tanks are connected to the BAF tank in a one-to-one correspondence mode. The two sedimentation tanks are connected to the transition tank at the same time; adding a flocculating agent and magnetic powder into the flocculation basin at the same time; each sedimentation tank is internally provided with a treatment mechanism for accelerating sedimentation of magnetic flocs and rapidly removing suspensions, each sedimentation tank is internally provided with a water outlet assembly capable of being adjusted in height, and the water storage area of the transition tank is lower than the water outlet assembly. The sewage treatment device has the advantage of improving the sewage treatment efficiency.

Disclosed are an iron-based nanocrystalline soft magnetic alloy powder, a soft magnetic composite material, and a preparation method therefor. The atomic percentage molecular formula of the iron-based nanocrystalline soft magnetic alloy powder is: FeaBbCcSidCueMmQqZzXx, M being at least one of Co and Ni, Q being at least one of a pre-transition element, a semi-metal element, a rare earth element and Al, Z being at least one of Au, Ag and a platinum group metal element, X being at least one of O, N, S and a halogen element, 70≤a+m≤75, 8≤b≤18, 0≤c≤5, 10≤d≤15, 0≤m≤10, 1.3≤e≤2.5, 0≤q≤2, 0≤z≤1, 0≤x≤0.2, 22≤b+c+d≤30, and a+b+c+d+e+m+q+z+x=100. The soft magnetic composite material is composed of the described iron-based nanocrystalline soft magnetic alloy powder, an alloy-state soft magnetic powder, a binder and the like. The provided iron-based nanocrystalline soft magnetic alloy powder and soft magnetic composite material exhibit excellent soft magnetic performance, good processability and low cost.

The invention relates to the technical field of wastewater treatment, in particular to a Fenton reaction device for wastewater treatment, which comprises a plurality of reaction tanks, reaction cavities are formed in the reaction tanks, and the reaction tanks are provided with stirring mechanisms and are respectively used for performing primary oxidation, premixing and secondary oxidation, complex reaction and flocculation reaction treatment on wastewater; the plurality of reaction tanks are communicated in sequence; the agent adding device comprises a first agent adding mechanism and a second agent adding mechanism, the first agent adding mechanism comprises a rotary feeding disc, and the rotary feeding disc rotates in the middle of the reaction tank, is connected with the stirring mechanism and is used for rotationally adding a solid additive dissolving solution or a liquid additive or magnetic powder; and the second additive adding mechanism comprises an atomizing structure arranged in the reaction tank and is used for atomizing and spraying the liquid additive. The chemical mixing device has the effects of improving the chemical mixing efficiency and reducing local non-uniform mixing.

The invention discloses a heat supply pipeline welding seam detection device, and relates to the technical field of heat supply pipeline processing, the heat supply pipeline welding seam detection device comprises a transmission mechanism 1 and a detection bin, the transmission mechanism 1 is provided with an inverted U-shaped support, the bottom wall of the horizontal section of the inverted U-shaped support is slidably connected with magnetization members in a front-back symmetrical manner, and the inverted U-shaped support is provided with a clamping member and a pretreatment mechanism; a detection bin is arranged on the left side of the first conveying mechanism, and a transferring mechanism, a marking mechanism and a second conveying mechanism are arranged on the detection bin. Through cooperation of the driving assembly and the brushing assembly, the outer wall of the to-be-detected pipe fitting is brushed, the situation that magnetic powder, oxide skin, burrs and the like adhere to the surface of the pipe fitting, the magnetic powder gathering phenomenon caused by non-defect factors is caused, and misjudgment occurs in the detection process is avoided, through cooperation of the driving assembly and the flushing assembly, the pipe fitting is flushed, and the detection efficiency is improved. The scraped impurities are prevented from being attached to the outer wall of the to-be-detected pipe fitting, and meanwhile, the pre-wetting treatment can be carried out, so that the fluorescent magnetic suspension is helped to cover the surface of the pipe fitting more uniformly.