389 results about "Ferromagnetism" patented technology

The invention provides a chemical restoration method for treating heavy metal-polluted terrain soil by ferromagnetic artificial nucleuses. In a ferromagnetic artificial nucleus soil restoration method, the ferromagnetic artificial nucleuses are applied to heavy metal-polluted soil; soil above a heavy metal pollution depth is overturned by cultivation equipment to uniformly mix with the ferromagnetic artificial nucleuses; and after heavy metal can be dispersed from the soil to the artificial nucleuses by a period of time, the soil containing the artificial nucleuses is overturned by using the cultivation equipment to increase the change of the artificial nucleuses contacting with other soil. After the soil overturning procedure is repeated by multiple times, the cultivation equipment provided with magnets can be used for separating the ferromagnetic artificial nucleuses, absorbed with the heavy metal, from the polluted soil; and the content of the heavy metal of the polluted soil is reduced due to shifting-out of the ferromagnetic artificial nucleuses, so that the purpose of soil restoration is gradually achieved.

The invention discloses a method and a device for detecting and positioning an underground pipeline containing a ferromagnetic material. According to the invention, the fluxgate sensors and the position and attitude sensors are installed on the support frame, and the support frame is driven to rotate, so that rapid magnetic scanning measurement of the underground pipeline is realized, and the trend, the horizontal position and the depth of the pipeline are estimated. According to the invention, the efficiency is greatly improved by adopting a rotary scanning strategy, the problem of uneven or muddy ground is avoided, and the method is suitable for detecting a ferromagnetic target with a slender structure; the direction and depth of the pipeline are estimated by using the coordinates of the extreme points of the magnetic field, and the positions of ferromagnetic targets which are non-uniformly distributed along any straight line can be estimated; the method does not need an accurate magnetic field value, is suitable for a complex environment with strong interference, is short in estimation time, and supports real-time positioning of the pipeline; and the corresponding pipeline depth below each measurement node is estimated by using the measurement data of the plurality of measurement nodes at different heights, so that the method can be applied even if the pipeline is not horizontally buried.

The invention discloses a ferromagnetic material internal defect leakage magnetic field increasing method based on alternating current and direct current composite magnetization, which comprises the following steps of: fixing a workpiece at the center of a composite exciting coil, and synchronously applying direct current and high-frequency alternating current; after pure direct current magnetization is saturated, current is locked, and a basic leakage magnetic field is established; the surface magnetic conductivity is dynamically reduced by overlapping alternating current, and the magnetic shielding effect is weakened; a leakage magnetic field signal is scanned and collected through a differential Hall sensor array, and background magnetic field deduction, peak value comparison and adaptive filtering processing are carried out; and determining an optimal magnetization parameter combination by adopting a gradient descent method and Bayesian optimization. The system is integrated with a composite excitation coil and a signal conditioning unit, so that synchronous excitation, signal acquisition and real-time analysis are realized. The leakage magnetic field signal at the deep defect is enhanced through alternating-current and direct-current composite magnetization, the problem of signal weakening caused by traditional direct-current saturation is solved, the defect detection sensitivity and efficiency are improved, and the method is suitable for non-destructive detection scenes of ferromagnetic materials.

A cover mat includes first and second layers each having an upper surface and a bottom surface and each comprising a foam material, the second layer attached to the first layer, the second layer configured to be supported by a support surface that is separate from the cover mat, wherein a preformed relief extends into at least one of the first layer and the second layer, and a magnet located within the preformed relief and between the first layer and the second layer such that the magnet is completely encapsulated between the first layer and the second layer, and wherein the magnet is configured to secure a ferromagnetic article to the cover mat.

A method for fabricating an optoelectronic arrangement is described, comprising the following steps: - Providing a carrier (1) with a top surface (1a) and a bottom surface (1b), - Forming a plurality of contact pads (2) on the carrier (1) on the upper surface (1a), wherein each contact pad (2) is free of ferromagnetic materials, - Forming a shield (3) on the carrier (1), wherein the shield (3) at least partially surrounds each contact pad (2) in the lateral direction (L) and comprises a first ferromagnetic material, - Providing a plurality of optoelectronic components (4), each component comprising a second ferromagnetic material on a side facing the upper surface (1a) of the support (1), - Providing a magnet (5) on the lower surface (1b) of the support (1), wherein the magnet exerts a magnetic force (F), - Bringing the majority of optoelectronic components (4) closer to the upper surface (1a) and - Attaching the majority of optoelectronic components (4) to the carrier (1) on the upper surface (1a). The optoelectronic components (4) may, for example, be micro-LEDs.

The invention relates to a seabed trapezoidal foldable electromagnetic coil device, which belongs to the technical field of ocean electromagnetic detection and comprises a main bearing beam, an expandable transmitting coil assembly, a receiving coil assembly, a transmission connecting rod, a hinged rotating seat, a sliding connecting seat and a push-pull driving rod. The transmitting coil is of a symmetrically-distributed trapezoidal structure, the receiving coil is in sliding fit with the main bearing beam through the sliding connecting base, the push-pull driving rod is in linkage with the receiving coil to move and the transmitting coil to be unfolded / folded, the device frame is made of a macromolecule non-magnetic material, and the ferromagnetic driving component is arranged in an avoiding mode. Receiving coil plane magnetic field balance is achieved through the non-uniform magnetic field design of the trapezoidal transmitting coil, coil space optimization configuration is completed through a linkage mechanism, folding portability and anti-interference performance of a multi-layer coil are achieved at the same time, direct coupling of a primary field of the transmitting coil to receiving is effectively restrained, the stability and the signal-to-noise ratio of a detection signal are improved, and the detection precision is improved. The method is suitable for complex seabed transient electromagnetic detection scenes carried by AUV / ROV.

The invention relates to the technical field of nondestructive testing, and particularly discloses a non-ferromagnetic thin plate full-wall-thickness defect detection method and system, and the method comprises the steps: applying a rotating electromagnetic field generated by excitation of two paths of multi-frequency signals with orthogonal phases, and synchronously collecting spatial magnetic field response data to form original response data; the method comprises the following steps: converting a time domain signal of each spatial point into a two-dimensional time-frequency spectrum, organizing into a time-frequency-space three-dimensional joint data volume, performing high-order decomposition on the data volume to separate out a plurality of independent signal components, and calculating a spatial statistical variable coefficient and a frequency maximum centroid offset of the independent signal components to obtain a time-frequency-space three-dimensional joint data volume; a target signal component representing defect disturbance is screened out, the defect depth is calculated based on the time feature of the target component, the defect two-dimensional morphology is reconstructed by combining the space feature of the target component, and the defect three-dimensional model is generated by fusing the defect depth and the defect two-dimensional morphology through improved inverse distance weighted interpolation and curved surface smoothing; according to the invention, detection and three-dimensional shape reconstruction of defects with different depths and different orientations in the thin plate are realized.

Removable straw cover securing mechanisms, beverage containers with removable straw cover securing mechanisms, and methods of manufacturing, testing, and using the same are provided herein, among things. The removable straw cover includes a magnetic or ferromagnetic component that can be mateably engaged with a corresponding magnetic or ferromagnetic element on a lid to securely secure the removable straw cover to the lid. This magnetic interaction forms a secure yet easily detachable bond, allowing for convenient use.

The invention belongs to the technical field of non-magnetic material nondestructive testing, and discloses a non-ferromagnetic material thickness and conductivity synchronous measurement method based on eddy current phase characteristics, and the method comprises the specific steps: S1, estimating the conductivity and thickness range of a to-be-tested piece based on data such as a product specification or an industrial standard; s2, determining excitation frequency according to a frequency selection criterion (high frequency enables the skin effect depth to be smaller than 1 / 3 of the thickness, and low frequency enables the skin effect depth to be larger than two times of the thickness of the sample); s3, an eddy current method is adopted to obtain the impedance variable quantity phase of the to-be-measured non-ferromagnetic material; and S4, substituting the phases into corresponding simplified model formulas respectively, and obtaining the conductivity and the thickness at the same time. Aiming at the problems of multiple calibration, blindness in excitation frequency selection, low single-parameter measurement efficiency and the like in conductivity or thickness measurement by an existing eddy current method, double-parameter output of single measurement is realized, multiple calibration and inversion calculation are not needed, the calculation is simple, rapid and accurate, the hardware cost is low, and the applicability is wide.

The utility model discloses a positioning mechanism for leather punching equipment, and relates to the technical field of leather processing, and the positioning mechanism comprises a ferromagnetic base plate which is used for supporting materials; the pressing plate and the supporting plate are parallel to each other, an electromagnet is fixedly connected to the supporting plate, and the electromagnet is used for fixing the supporting plate and the ferromagnetic substrate in a magnetic attraction mode; the pressing plate is in sliding connection with the supporting plate through an elastic assembly, and the elastic assembly exerts downward pressure on the pressing plate to press materials. According to the positioning mechanism for the leather punching equipment, the pressing plate and the supporting plate are arranged, the supporting plate is fixed to the ferromagnetic base plate through the electromagnet, pressure is applied to the pressing plate through the elastic assembly to press and fix the edge of leather, and positioning is convenient and firm.

A composite electromagnetic wave-absorbing material and preparation method therefor are provided. The composite electromagnetic wave-absorbing material includes following raw materials: magnetite powder, nickel powder, copper powder, samarium oxide, gadolinium oxide, cerium oxide, carbon black powder, graphite powder, epoxy resin, barium titanate powder, antioxidant, curing agent, diluent and leveling agent. Ferrite wave-absorbing materials are used as matrixes to be compounded with nickel powder, copper powder, graphite powder, carbon black and barium titanate, and doped with mixed rare earth oxides through combination of samarium oxide, gadolinium oxide and cerium oxide to thereby obtain the composite electromagnetic wave-absorbing material which combines magnetic loss characteristics of magnetite powder, ferromagnetic behavior of nickel powder and conductivity of copper powder, helping to achieve good electromagnetic wave-absorbing performance. By introducing graphite powder, carbon black powder and barium titanate powder as fillers and doping rare earth, wave-absorbing characteristics of the composite electromagnetic wave-absorbing material are improved.

The invention relates to the technical field of magnetic suspension compressor assembly, and particularly discloses a magnetic pollution source prevention and control optimization method in a magnetic suspension compressor assembly process, which comprises the following steps: in a pretreatment stage of magnetic suspension compressor assembly, dynamically optimizing thermal cycle parameters in a low-temperature environment by adopting a self-adaptive genetic algorithm; ferromagnetic impurities hidden in microdefects of the compressor component are accurately induced to be released in advance; carrying out feature extraction and pattern recognition on the released impurity signals in combination with wavelet packet transformation and a neural network algorithm; according to the method, a low-temperature thermal cycle process optimized by a self-adaptive genetic algorithm is constructed in the pre-assembly treatment stage, ferromagnetic impurities hidden in microcracks are accurately induced to be released in advance, and accurate removal of the impurities before entering the assembly link is realized by combining wavelet packet transformation and targeted pulse demagnetization driven by a neural network; the limitation that impurities in the microdefects cannot be touched by a traditional cleaning and demagnetizing method is broken through, and the hidden danger of magnetic pollution which cannot be found by initial detection is eliminated from the source.

The application discloses a multi-directional excitation magneto-optical image registration method under hybrid driving, and the method comprises the following steps: collecting the defect magnetic field distribution information of the surface of a ferromagnetic material under multi-directional excitation through a magneto-optical imaging device to obtain a reference image and a floating image; extracting the defect contour of the two images according to a gradient operator; performing spatial transformation on the defect contour of the floating image, and then performing or operation and morphological closing operation on the defect contour of the floating image and the defect contour of the reference image to obtain a defect contour map with closed shape; obtaining the magnetic leakage field distribution map of the defect contour map through defect magnetic leakage field model forward modeling; calculating the similarity measure of the reference image and the magnetic leakage field distribution map generated by the model; and finally continuously updating the spatial transformation parameters through an optimization search algorithm, and the registration is successful when the similarity measure reaches the maximum.

Provided is a magnetic recording medium comprising a non-magnetic support and a magnetic layer containing ferromagnetic powder, and further comprising a non-magnetic layer containing non-magnetic powder between the non-magnetic support and the magnetic layer. The average pore diameter of the magnetic layer and the non-magnetic layer is 30.0 nm or less, and the standard deviation of the pore diameter distribution of the magnetic layer and the non-magnetic layer is 30.0 nm or less.

The invention discloses a ferromagnetic material displacement measurement method and device based on PWM waves and a phase method. The method comprises the steps that two paths of same-frequency PWM square wave signals are generated; applying the excitation signal to the electromagnetic induction probe, and based on the relative displacement between the electromagnetic induction probe and the ferromagnetic material, obtaining an induction signal which is output by the electromagnetic induction probe and whose phase changes with the relative displacement; converting the induction signal into a third PWM square wave signal, wherein the phase of the third PWM square wave signal is related to the phase of the induction signal; performing logic AND operation on the third PWM square wave signal and a reference signal to generate a pulse signal; and filtering the pulse signal to obtain a displacement measurement result proportional to the relative displacement. The single-chip microcomputer is adopted to generate high-frequency PWM waves, the phase method and digital logic processing are combined, magnetic field interference and signal drifting in ferromagnetic material measurement are effectively restrained, high precision and high dynamic response are guaranteed, and meanwhile system complexity and cost are remarkably reduced.

The application discloses an electromagnetic heating cooking appliance. It comprises a control device, an electromagnetic heating module, a cooking container, and a working condition display component. The electromagnetic heating module comprises at least one electromagnetic coil for generating an alternating magnetic field under the control of the control device, and the magnetic field area of the alternating magnetic field is non-uniformly distributed in the circumferential direction of the electromagnetic heating module; the cooking container comprises a ferromagnetic material, which is arranged in the magnetically inducible area of the electromagnetic heating module, and the central axis of the cooking container is substantially coincident with the central axis of the electromagnetic heating module; the working condition display component is electrically connected to the control device. The control device is configured to simultaneously perform the following operations during at least part of the cooking process: relatively rotating the cooking container and at least part of the electromagnetic heating module around the central axis to relatively rotate the alternating magnetic field and the cooking container; and making the working condition display component output at least a first visual signal representing the relative rotation.

The present application relates to the field of pipeline nondestructive testing, and particularly relates to a pipeline corrosion detection method based on an external normal magnetic field and a corresponding pipeline corrosion detection system based on a pig. The scheme places a permanent magnet at a to-be-detected area of a ferromagnetic pipeline, magnetizes the pipeline using the permanent magnet, and causes a permeability distortion in the local pipe wall of the pipeline. The degree of the permeability distortion is related to the pipe wall thickness. On this basis, an eddy current sensor carried on the pig is used to scan the pipeline together with the pig. Then, the pipe wall thickness is obtained according to the obtained permeability distortion information of the pipe wall at each position of the pipeline, and corrosion detection of the inner pipe wall of the pipeline is realized. The present application also develops a corresponding pipeline corrosion detection system based on a pig on the basis of the related detection idea. The scheme can effectively overcome the problems of high cost and low efficiency of the existing pipeline internal detector.

This utility model relates to the field of weighing technology and discloses an adaptive magnetic weighing suction cup suitable for multiple scenarios. It includes a user-protective housing assembly, inside which is a magnetic suction component for adsorption and weighing. A height adjustment component is mounted at the rear of the housing assembly, and a connection component for connecting to external devices is located at the top of the height adjustment component. The housing assembly protects and mounts the magnetic suction component, and the front and rear housings form a protective space, making the structure compact and robust. During adsorption, the permanent magnet of the magnetic suction component magnetically attracts ferromagnetic objects. Because it is installed within the housing assembly's structure, the stability of the adsorption is ensured. During the adsorption process, combined with a weighing sensor, the weight of the adsorbed object can be measured. Furthermore, the weight of the object can be transferred to the weighing sensor through mounting plate one, mounting plate two, and a metal plate, achieving synergy between magnetic attraction and weighing to meet the needs of multiple scenarios.

This invention belongs to the field of magnetic separation equipment technology and discloses a magnetic separation and impurity removal screening device for green recycled concrete production. The device includes a frame, within which a concrete material conveyor belt is installed. One end of the frame is fixedly connected to a top feeding frame located above the concrete material conveyor belt. An auxiliary assembly support is fixedly connected to the upper end of the frame. Three horizontally equidistant magnetic separation conveyor belts are mounted on the inner end of the auxiliary assembly support. Through the coordination of the three horizontally equidistant magnetic separation conveyor belts, the concrete material conveyor belt, and the vertical gap between them, the recycled concrete raw material passes sequentially under the three magnetic separation conveyor belts, achieving multi-stage layered adsorption and impurity removal from front to back. This avoids the problems of residual or missed ferromagnetic impurities in single-stage magnetic separation, ensuring the thorough removal of fine magnetic materials such as rebar ends and iron filings, and significantly improving the purity and finished product quality of the green recycled concrete.

The application discloses a kind of full-automatic magnetic particle detection device and defect identification method for defect identification, it is related to nondestructive testing technical field.The present application comprises: mobile platform, the bottom of the mobile platform is equipped with multiple groups of driving assembly, for moving on the surface of the workpiece to be measured;Multiple magnetization components, the magnetization component is arranged at the bottom of mobile platform, for generating rotating magnetic field to the workpiece to be measured magnetization;Magnetic suspension liquid spraying assembly, the magnetic suspension liquid spraying assembly is installed in the bottom of the mobile platform, and magnetic suspension liquid spraying assembly is located between adjacent magnetization component, for spraying magnetic suspension liquid to the surface of the workpiece to be measured.The present application realizes the physical isolation of detection personnel and dangerous scene, eliminates the subjective error of artificial detection, and is suitable for high altitude, closed, toxic, radiation and other complex working conditions of ferromagnetic material surface and near-surface defect detection.

The invention relates to a method for determining the AC linear electrical resistance of a steel pipe, comprising the steps of generating an induced current in a portion (4) of the pipe by means of an induction coil (6) centered on a longitudinal axis (XX) of the pipe and traversed by an alternating current, the coil being housed in a ferromagnetic cylinder head (8) to confine the magnetic field over a predefined surface of the pipe portion, measuring the active power dissipated by the pipe portion subjected to the magnetic field, measuring the amplitude of the produced magnetic field, and determining the AC linear electrical resistance of the pipe portion from the measurements of the dissipated active power and the amplitude of the induced magnetic field. The invention also relates to a device (2) for implementing said method.

Angular velocity control device for a spacecraft and corresponding spacecraft. The invention relates to a device (1) for controlling the angular velocity of a decommissioned spacecraft, comprising: - a stator (3) and a rotor (4) movable about an axis (A21) of rotation relative to the stator. The stator (3) comprises an electrically conductive and non-ferromagnetic body (6), while the rotor (4) comprises a magnetized system (7) configured to induce, in the stator (3), braking eddy currents of a relative motion of the rotor (4) with respect to the stator (3); - a levitation magnet (11) intended to cooperate with a magnetic field generated by an external source to induce magnetic levitation of the rotor (4) with respect to the stator (3). The device (1) is made of one or more non-ferromagnetic materials in a zone (11ZI) influenced by the magnetic field generated by the levitation magnet. SAMPLE FIGURE: [Fig.4]

1. Name of the design product: Ferrograph (double rotary). 2. Use of the design product: An instrument for depositing, collecting ferromagnetic wear particles in oil and removing oil and other contaminants by rotating centrifugal force, gravity and magnetic force. 3. Design points of the design product: in shape. 4. Picture or photo best indicating the design points: perspective view 1.

The invention provides a part inner surface polishing machine. The part inner surface polishing machine comprises a shell, a clamping and fixing assembly, an ultrasonic spiral vibration rod and a three-phase alternating coil. The shell is provided with an abrasive storage transporter used for storing ferromagnetic abrasives. The clamping and fixing assembly is used for clamping a workpiece with a through hole; the ultrasonic spiral vibration rod comprises a driving part, a rod body and a spiral boss, the driving part is used for driving the rod body to rotate and vibrate in the axial direction, and the spiral boss is provided with a conveying groove communicated with the abrasive storage transporter; the three-phase alternating coil is arranged on the peripheral side of the clamping and fixing assembly; wherein the rod body is arranged in the through hole in a penetrating mode, the ferromagnetic abrasive is in contact with the inner wall face of the through hole, the three-phase alternating coil can generate a magnetic field, and the magnetic field enables the ferromagnetic abrasive to be attached to the inner wall face of the through hole and can drive the ferromagnetic abrasive to move up and down in the radial direction. Ultrasonic waves and electromagnetic force are combined, the efficient, uniform and environment-friendly polishing process is achieved through the synergistic effect of the ultrasonic waves and the electromagnetic force, and the polishing efficiency and the surface quality can be remarkably improved.

This invention belongs to the field of nondestructive testing technology, and particularly relates to a visual detection method for ferromagnetic material defects based on AC / DC composite excitation. This method overcomes the problem of existing AC electromagnetic field detection methods failing to obtain complete visualization of complex defect morphologies in ferromagnetic materials due to mutual interference between current disturbances and leakage magnetic field disturbances, thus providing more detailed and reliable data support for structural safety assessments of offshore oil platforms and offshore wind power platforms. The visual detection method for ferromagnetic material defects based on AC / DC composite excitation includes the following steps: scanning to obtain a magnetic field signal SBz; extracting the DC component SBz from the magnetic field signal SBz. z and communication component SBz j And form a surface matrix; calculate matrix Bz z Matrix Bz j The difference is used to obtain matrix Bz. By performing operations such as curl calculation, gradient calculation, grayscale conversion and binarization on the array of matrix Bz and the image, the defect contour, disturbance current density and disturbance current line image are obtained.

The present invention relates to an actuator having a driver (2) for driving a drive shaft (1), a first operating element (3) operatively connected to the drive shaft (1) for operating a shifting device, a spring element (5), and an electromagnetic holding device (32) with an electromagnet. The spring element is supported on one side on a housing member (16) of the actuator and on the other side on a second operating element (17) configured to tension the spring element (5). The electromagnet magnetically interacts with a magnetic armature (52) having a ferromagnetic material composition to hold the tensioned spring element (5) in the presence of a return force. According to the invention, the magnetic armature (52) is tiltably and / or oscillatingly supported on an oscillating member (55) of the holding device (32).

The magnetic element of the present embodiment includes a wiring layer and a first ferromagnetic layer in contact with the wiring layer, and the wiring layer includes a first layer of a crystal phase and a second layer of an amorphous phase between the first ferromagnetic layer and the first layer.

The invention discloses a non-Newtonian fluid-based particle and biomolecule stepping separation method and device. Through microstructure arrangement of the non-Newtonian fluid, particles and biomolecules which cause different shear rates have blocking and passing characteristics, molecules with different volumes and different charge quantities are separated under the action of a square wave electric field, or molecules with different volumes and different charge quantities are separated under the action of a uniform gradient square wave magnetic field. The invention relates to a method for separating particles with different ferromagnetism or biomolecules combined with magnetic microbeads. Comprising a non-Newtonian fluid and a carrier thereof, a square wave electric field for providing power and a corresponding electrode or a magnetic field generator, and a support carrier for accommodating particles and biomolecules. After the particles and the biomolecules are separated in the square wave electric field for a period of time, the electric field intensity is changed, the second type of particles or biomolecules are separated, and the electric field intensity is sequentially switched according to the number of components to be separated, so that the separation purpose is achieved.

The utility model relates to the technical field of metal processing, in particular to a metal smelting feeding device which comprises a feeding mechanism, a screening mechanism and a feeding mechanism. The material screening mechanism comprises a material screening supporting frame, a first conveying assembly arranged on the material screening supporting frame, a material sweeping assembly and a collecting box. The material sweeping assembly is located below the first conveying assembly. The first conveying assembly comprises a conveying frame arranged on the screening supporting frame and a conveying belt arranged on the conveying frame, and a plurality of magnets are arranged on the conveying belt. The plurality of magnets are arranged on the conveying belt of the first conveying assembly, ferromagnetic impurity metal in smelting raw materials can be adsorbed, the adsorbed metal is swept into the collecting box under the cooperation of the material sweeping mechanism, the ferromagnetic impurity metal is screened out from the smelting raw materials, the operation efficiency is high, and the cost is low. And ferromagnetic impurity metal is prevented from influencing the smelting effect, and the quality of smelted metal is guaranteed.