18 results about "Toroidal magnetic fields" patented technology

The embodiment of the invention relates to the technical field of concrete 3D printing, and provides a concrete 3D printing device and method based on magnetorheological response, and the device comprises a printer main body, a first magnetic field module and a second magnetic field module; the first magnetic field module is arranged on the outer side of a printing head of the printer body and used for applying an annular magnetic field to the printing head so as to guide the extrusion direction of steel fibers in a concrete material to be directionally arranged before the concrete material is extruded to a component. The second magnetic field module is arranged below the component and used for applying an adjustable magnetic field to the printed concrete strip so as to guide steel fibers in the concrete strip to be sequentially connected with the interlayer interface of the component in a bridging mode, and the direction of the magnetic field generated by the first magnetic field module is matched with the direction of the magnetic field generated by the second magnetic field module. By means of the device provided by the embodiment of the specification, the printability of 3D printing concrete and the interlayer bonding performance can be improved.

The invention discloses a three-phase cable live-line state identification device and method based on an annular magnetic field sensing array, and belongs to the technical field of power system safety detection. Existing non-contact electricity testing methods cause misjudgment due to the fact that target cable body current and adjacent loop coupling current are difficult to distinguish. The cable is sleeved with an openable annular support, three magnetic field sensors are fixed to the inner side of the openable annular support circumferentially, and each magnetic field sensor is aligned to the position over a corresponding phase conductor in the three-phase cable in space so as to independently sense the power frequency magnetic field of each phase; the method comprises the following steps: processing three paths of synchronously acquired signals, extracting an instantaneous phase of each signal, and calculating a phase difference between every two signals; and finally, according to a comparison result of the three phase differences and a preset criterion, judging that the cable is in a normal electrified state, an external coupling interference state or a non-electrified state without obvious external magnetic field interference and the like. According to the technical scheme, non-contact, rapid and reliable live-line state identification can be effectively carried out on the three-phase cable.

The utility model relates to the technical field of magnetic particle separation, in particular to a magnetic particle separation device which comprises a magnet container with a separation cavity; the first magnet group comprises a plurality of first magnets, the first magnets are arranged on the peripheral side of the separation cavity along the first circumference, and the first magnet group forms a first magnetic field in the whole separation cavity; the second magnet group comprises at least one second magnet, the second magnet is located at at least one end of the magnet container and arranged on the peripheral side of the separation cavity along a second circumference, and the diameter of the second circumference is smaller than that of the first circumference; wherein the magnetization direction of the second magnet group is opposite to the magnetization direction determined according to the magnetization direction rule of the first magnet group, and the second magnet group is used for correcting the first magnetic field at the end part of the separation cavity. The corrected first magnetic field has an annular magnetic field with a larger radius, and the magnetic particles are distributed more uniformly on the wall of the reagent bottle after being separated in the separation cavity.

The application relates to the technical field of power distribution network electrical equipment state monitoring, and discloses a contact contact state online monitoring and early warning method for a switch cabinet in a power distribution room. The method synchronously collects spatial magnetic field instantaneous signals and busbar phase current instantaneous signals through an annular magnetic field sensing array and a current transformer; the fundamental wave magnetic field amplitude, the third harmonic magnetic field amplitude and the busbar phase current amplitude are extracted by using a digital phase-locked demodulation algorithm; the spatial distribution gradients of the fundamental wave magnetic field amplitude and the third harmonic magnetic field amplitude are subjected to first-order and third-order normalization processing by using the busbar phase current amplitude, so that the spatial magnetic field asymmetry index and the spatial gradient modulation degree are obtained; the spatial magnetic field asymmetry index and the spatial gradient modulation degree are compared with preset confidence threshold values respectively, and a contact state early warning result is output by combining two-dimensional phase diagram judgment logic. The application realizes decoupling and online independent evaluation of static electric contact degradation and dynamic mechanical fatigue.

This invention discloses an underground pipeline detection system and method based on directional source-well electromagnetic induction. The system includes a magnetic field source module for generating a ring-shaped magnetic field in the target pipeline, a vertically downward-facing well located on one side of the target pipeline, a measuring coil, a drive module, a measurement module, and a calculation module. The plane of the measuring coil forms an acute angle with the horizontal plane. The drive module drives the measuring coil to rotate and move up and down, changing the magnitude of the magnetic flux and the depth of its position. The measurement module obtains the depth, rotation angle, and magnetic flux of the measuring coil. The calculation module calculates the position of the target pipeline relative to the well based on the position of the measuring coil obtained by the measurement module and the corresponding magnetic flux at that position. The system calculates the positional relationship of the target pipeline relative to the well based on the electromagnetic induction characteristics in the well. The calculated position has small error, short acquisition cycle, low cost, strong anti-interference capability, and accurate detection results, thus better meeting the needs of practical detection.

The application discloses a magneto-rheological polishing method and relates to the polishing technical field.The method comprises the following steps: constructing a magnetic field generating device with a ring gap structure;filling the magneto-rheological fluid in the ring gap structure, and then fixing a workpiece to be polished so that the workpiece to be polished is immersed in the magneto-rheological fluid; setting magneto-rheological polishing parameters, starting the magnetic field generating device and adjusting the magnetic field strength, forming a ring magnetic field with different magnetic field strengths, and rotating the workpiece to be polished relative to the magneto-rheological fluid to realize polishing of the surface of the workpiece to be polished.The method can improve the polishing precision of complex curved surface structures, and under the action of the ring magnetic field with adjustable magnetic field strength, the magneto-rheological polishing fluid can simultaneously polish the inner and outer surfaces of the workpiece, thereby improving the polishing efficiency; the strong-viscosity magnetic force brush can remove the surface material of the workpiece to be polished, and the method can be suitable for polishing workpieces of various materials and complex curved surfaces and the inner and outer surfaces thereof.

A magnetic field-sensitive assembly includes a ring-shaped magnetic field-sensitive component and at least one web-shaped magnetic field-sensitive component accommodated in a housing, wherein the ring-shaped magnetic field-sensitive component includes a through opening and an inner cylindrical surface and an outer cylindrical surface, wherein the housing includes at least a first penetration extending through the housing within the through opening of the ring-shaped magnetic field sensitive component, and the magnetic field-sensitive assembly further includes at least one clamping means which is set up to clamp the web-shaped magnetic field-sensitive component within the ring-shaped magnetic field-sensitive component. Further, an inductive component, a method of manufacturing a magnetic field-sensitive assembly and the use of a magnetic field-sensitive assembly are provided.

The embodiment of the invention discloses an electromagnetic driving mechanism, a relay, a power distribution box and a power distribution system, and the electromagnetic driving mechanism comprises a yoke piece, a first permanent magnet piece, a second permanent magnet piece, and a driving assembly. A non-magnetic area is arranged between the first permanent magnet part and the second permanent magnet part; the driving assembly comprises a coil, a coil rack, a first movable iron core and a second movable iron core; the coil is wound on the coil rack; the first movable iron core position and the second movable iron core are arranged on the two sides of the coil respectively; the driving assembly is movably assembled between the first permanent magnet part and the second permanent magnet part in the second direction and is provided with a first holding position and a second holding position. When the driving assembly is located at the first holding position, the first movable iron core is in contact with the yoke iron piece; and when the driving assembly is located at the second holding position, the second movable iron core is in contact with the yoke iron piece. The non-magnetic area is arranged in the middle of the bipolar permanent magnet to weaken an annular magnetic field, and meanwhile, the yoke iron piece and the iron core provide holding force on two holding positions, so that the magnetic field utilization rate of the electromagnetic driving mechanism is improved.

The invention belongs to the technical field of motors, and particularly relates to a vacuum energy switched reluctance motor capable of converting vacuum energy into mechanical energy to be output. The working principle of the vacuum energy switched reluctance motor is as follows: the vacuum energy switched reluctance motor is excited by short-circuit current in a non-inductive stator winding and generates an annular magnetic field around an electrified conductor; under the action of the annular magnetic field, the stator salient poles and the iron core pole pieces on the surface of the rotor drive the rotor to rotate and do work according to the principle of shortest magnetic circuit; as the electric power consumed by the short-circuit current is very small, and the magnetic field suction force between the stator salient poles and the rotor pole pieces is in direct proportion to the square of the current, larger mechanical torque and power can be formed, so that vacuum energy is converted into mechanical energy.

The invention discloses a particle collection and evaporation method and device based on Lorentz force, and relates to the field of silicon-based OLEDs, the method comprises the following steps: S1, iron-containing particles and evaporation material gas are discharged through an evaporation source at the same time, and the gas flow runs from bottom to top; s2, the airflow passes through an annular magnetic field area, the iron-containing particles deflect out of a vertical channel under the influence of Lorentz force, and the evaporation material gas moves upwards along the vertical channel; s3, capturing the iron-containing particles by a carbon nanotube conductive collection net; s4, sucking the iron-containing particles on the carbon nanotube conductive collection net into a particle sealing tank for storage through a vacuum suction pipeline in the vacuum adsorption device; and S5, performing component analysis on the particles, and monitoring the change of the pollution particles to perform targeted management and control. According to the scheme, a novel evaporation equipment scheme is provided, iron-containing pollution particles are filtered and collected in the evaporation process, the phenomenon that the particles pollute an OLED film layer is fundamentally eradicated, bad bright spots are avoided, and the product yield is increased.

The invention relates to the technical field of detection, particularly discloses a liquid level measurement method for an external magnetostrictive guided wave closed container, and relates to the technical field of liquid level measurement. According to the method, an external magnetostrictive guided wave device is adopted and comprises a waveguide assembly, an excitation and detection circuit and an intelligent processing unit. An annular magnetic field is generated through excitation current pulses, magnetic field changes caused by liquid level changes are induced, torsional wave pulses are generated, and the liquid level is obtained through detection and calculation of an algorithm model. The innovation point lies in seven technologies such as an external structure, novel materials and multi-mode induction, the problems that a traditional method is low in precision, narrow in application range, difficult to maintain and the like are solved, and the liquid level sensor has the advantages of being high in precision, wide in application range, easy to maintain and the like and can be widely applied to industrial liquid level measurement.

The application discloses a three-phase cable live state recognition device and method based on a ring magnetic field sensing array, and belongs to the technical field of power system safety detection. The existing non-contact electricity testing method is difficult to distinguish the target cable body current and the adjacent loop coupling current, thus leading to misjudgment. The application adopts an openable and closable ring support which is sleeved on the outside of the cable, three magnetic field sensors are fixed on the inner side of the ring support in a circle, each magnetic field sensor is respectively aligned with the top of a corresponding phase conductor in the three-phase cable in space, so as to independently sense the power frequency magnetic field of each phase; the instantaneous phase of each signal is extracted and the phase difference between each other is calculated by processing the three-way synchronous collected signals; finally, according to the comparison result of the three phase differences and the preset criterion, the state of the cable is determined, such as normal live, external coupling interference, unlive and no significant external magnetic field interference. The technical scheme can effectively recognize the live state of the three-phase cable in a non-contact, fast and reliable manner.

The utility model discloses a high pressure resistant type precession vortex flowmeter which comprises a vortex flowmeter body, a pair of convex drainage tubes and a pressure intensity adjusting structure, the convex drainage tubes are installed on the two sides of the vortex flowmeter body respectively, and the pressure intensity adjusting structure is installed on the inner sides of the convex drainage tubes. The utility model relates to the technical field of vortex flow meters, firstly, a core buffer adjusting assembly of the vortex flow meter adopts a three-stage hydraulic expansion structure, the hydraulic energy conversion efficiency is enabled to break through 85% by utilizing the Laval nozzle effect, 0.1-1.5 MPa pressure intensity adjustment can be completed within 5ms, and the response speed is increased by three times compared with that of a traditional hydraulic adjusting system; and secondly, the buffer assembly creatively applies the magnetohydrodynamics principle, and by means of the coupling effect of a conical shunt block and an annular magnetic field, the cascade conversion of fluid kinetic energy is achieved while the shunt precision is kept to be + / -0.02 mm, and the eddy current inhibition efficiency reaches 92%.

The utility model discloses mechanical-assisted magnetic solution continuous purification equipment, which relates to the technical field of magnet processing equipment, and is characterized in that a movable box body is arranged in the middle of the upper part of a base, a motor is arranged on one side of the movable box body above the base, an annular magnet is arranged on the other side of the movable box body, and a movable block is arranged on the outer side of the movable box body in a sliding manner; a container is clamped and mounted below the moving block through two groups of semi-rings, and the container is controlled by a motor to move up and down, enter the annular magnet and leave the magnet block. A paramagnetic solution sample is controlled to enter and exit from a magnetic field in a mechanical motor mode, the situation that the paramagnetic solution sample cannot be manually taken out under the condition of strong magnetic attraction is overcome, the paramagnetic solution is added into the magnetic field in a peristaltic pump mode, a solution without magnetism flows through and is removed from the lower portion, continuous sample loading can be achieved, and the sample loading efficiency is improved. The method is not influenced by a cylindrical magnetic field and the volume of a matched cylindrical container, and the efficiency of separating the paramagnetic solution by the annular magnetic field is obviously improved.

The invention relates to the field of condensed physics and quantum mechanics, in particular to a method for increasing quantum tunneling probability based on a magnetic focusing effect, which has the principle that a structure (the structure material is a ferromagnetic or paramagnetic substance) capable of generating ring-shaped, square, spiral and other ring-shaped magnetic field channels is introduced into a material to be tunneled; based on the focusing effect of the annular magnetic field on the moving ion beam, more particles directionally move in the shortest path, and the particle tunneling probability is increased; according to the structure, a permanent magnet structure generates a ring-shaped magnetic field channel through arrangement of permanent magnets, an external magnetic flux introduction structure introduces external magnetic flux through a high-magnetic-conductivity material to generate a ring-shaped magnetic field channel, and a current introduction magnetic field structure generates a ring-shaped magnetic field channel through a current magnetic effect.

The invention discloses a bent hole inner surface polishing and strengthening treatment device and method. External controllable square planar magnetic fields are placed on the front side, the rear side, the left side and the right side of a to-be-ground workpiece with a bent hole, and an external controllable annular magnetic field surrounds the periphery of the to-be-ground workpiece with the bent hole as the center; the soft magnetic grinding head is formed by detachably connecting multiple stages of grinding heads in series front and back through rotary connecting pieces, the innermost part of each stage of grinding head is provided with an air bag, the outer surface of the air bag is tightly attached to an internal framework, the outer surface of the internal framework is tightly attached to a magnetic carrier layer, and an abrasive particle layer is embedded in the outer surface of the magnetic carrier layer. The particles of the abrasive particles on the front-stage grinding head are larger than the particles of the abrasive particles on the rear-stage grinding head; active bending of the grinding head in the stretching-in process and expansion from inside to outside in the grinding process are achieved, rough grinding, accurate grinding and polishing are conducted from front to back, the grinding state is maintained through inflation, the abrasive particle layer is separated from the hole wall through deflation, and controllable adjustment of the grinding area is achieved.

The application discloses a method for regulating the uniformity of plasma by a toroidal magnetic field, which comprises the following steps: driving the plasma discharge in a capacitive coupled plasma discharge chamber by a constructed radio frequency capacitive coupled plasma discharge device, so as to form a sheath radio frequency electric field on the inner wall boundary of the plasma discharge chamber; inducing a toroidal static magnetic field parallel to the surface of the electrode in the plasma discharge chamber by a set toroidal magnetic field induction structure; and driving the plasma to perform a radial directional drift transport from the center of the chamber to the edge by the sheath radio frequency electric field on the surface of the electrode and the toroidal static magnetic field, so as to regulate the uniformity of the plasma. The application solves the problems that the existing method cannot effectively regulate the uniformity of the plasma, has low applicability and high complexity.

The application discloses a magnetic confinement fusion device, comprising a vacuum chamber, a dipole field coil system, a plurality of toroidal field coils and a plasma region, wherein the vacuum chamber is used for containing plasma; the dipole field coil system comprises a plurality of dipole field coils, each of which is installed outside the vacuum chamber and arranged around the vacuum chamber to provide a poloidal magnetic field for confining the plasma; the plurality of toroidal field coils are arranged outside the vacuum chamber and the dipole field coil system along the toroidal direction of the vacuum chamber to provide a toroidal magnetic field for confining the plasma, and the plurality of toroidal field coils and the dipole field coil system jointly form a closed toroidal magnetic surface; and the plasma region is located in the closed toroidal magnetic surface. The application generates various different magnetic fields by relatively simple dipole field coils and toroidal field coils to confine the plasma, and is convenient to construct.