306 results about "Magnetic field effect" patented technology

Graphene magnet multilayers (GMMs) are employed to facilitate development of spintronic devices. The GMMs can include a sheet of monolayer (ML) or few-layer (FL) graphene in contact with a magnetic material, such as a ferromagnetic (FM) or an antiferromagnetic material. Electrode terminals can be disposed on the GMMs to be in electrical contact with the graphene. A magnetic field effect is induced in the graphene sheet based on an exchange magnetic field resulting from a magnetization of the magnetic material which is in contact with graphene. Electrical characteristics of the graphene can be manipulated based on the magnetization of the magnetic material in the GMM.

The invention relates to a method for preparing Co3O4 nano material under the action of a magnetic field by a hydrothermal method, which belongs to the technical field of chemical material technology. The method of the invention adopts cobalt salt, a dispersant, a precipitator, a surfactant and a solvent as the raw material; the precipitator and the cobalt salt react in a reaction kettle for 4-36 hours under the conditions that the molar mass ratio between the precipitator and the cobalt salt is 1:1-6:1, the compactness is 50-85 percent, the magnetic field strength is 1-100 Tesla on the basis of the hydrothermal method, and the reaction temperature is 100-240 DEG C to obtain the reaction product, and then the product is dried in a vacuum drying chamber for 6-12 hours under 60-80 DEG C to obtain the powder material of Co3O4. The Co3O4 nano powder material prepared by the method of the invention has the advantages of finer crystal grain, uniform dispersion and extremely high purity without other impurities.

The present invention relates to an anisotropic electric conduction material preparation method, which comprises that: a certain amount of a ferromagnetism electric conduction filler is added to an organic polymer monomer, uniform and mechanical stirring is performed under an appropriate temperature condition, if the organic material is a thermosetting polymer, an appropriate amount of a curing agent or a cross-linking agent is added after the system is uniformly dispersed, uniform stirring is continuously performed, the diffused composite system is injected into a mold, a magnetic field is applied on the mold position, orientation is performed for a certain time, and the orientation molding sample is placed in an oven to carry out thermal insulation curing for a certain time until the sample is completely cured. The anisotropic electric conduction material preparation method has characteristics of simple process and practicality, wherein the ferromagnetism electric conduction filler presents chain distribution under the external magnetic field effect, and conductivity of the material in a direction parallel to the chain direction is much higher than conductivity of the material in a direction perpendicular to the chain direction.

A method for determining electrical and magnetic field effects determines Lanczos matrices by performing a preconditioned conjugate gradient method using a nested multi-grid, vector and scalar potential preconditioner so that Pade via Lanczos frequency expansion may be used to determine the electrical and magnetic field effects over a frequency range without having to perform computationally slow and memory intensive matrix decomposition.

The invention discloses a permanent-magnetic speed regulation driving system, and belongs to the technical field of drivers. The system comprises an input shaft and a transmission shaft arranged concentrically, an output shaft connected with the transmission shaft, a conductor rotor arranged at the end of the input shaft, a permanent-magnetic rotor glidingly arranged at the end of the transmission shaft and extending into the conductor rotor, and a speed regulation device arranged on the transmission shaft and connected with the permanent-magnetic rotor, wherein the other end of the speed regulation device is fixed on a base; and the conductor surface of the conductor rotor is arranged corresponding to the pole surface of the permanent-magnetic rotor, and an air clearance is formed between the conductor surface and the pole surface. The shafts are arranged concentrically, the two rotors are separated through the air clearance, and the two shafts have no any direct mechanical connection by coupling of magnetic field effect, so rigid connection between a motor shaft and a load shaft is eliminated, vibration isolation between a load and a motor is not mutually affected, and a bigger centering error is allowed; and when the equipment is overload, the equipment can also be protected, and soft starting function is provided. The system not only can avoid the generation of harmonic, but also has strong adaptability to a severe environment.

Devices and methods of enhancing mass transport proximate a surface of an electrode immersed in a liquid are disclosed. One aspect of the device comprises an electrode embedded in a sintered or bonded magnetic material. The device is contacted with a solvent containing a redox material dissolved therein. An external voltage or current is applied to the electrode, which external voltage or current is sufficient to enhance mass transport proximate the surface of the electrode. Magnetic field effects can be effectively applied to the microstirring of fluids in conjunction with microelectrochemical systems in a lab-on-a-chip format. Suitable applications include bioassays, drug discovery, and high throughput screening, and other applications where magnetohydrodynamics can enhance chemical detection and / or reagent mixing, which otherwise rely on diffusional processes.

The invention relates to a non-magnetic temperature control system and method for an SERF atomic air chamber. The system comprises a non-magnetic heating sheet, a heating body, an atomic gas chamber and a heating system based on digital PID control. The atomic air chamber is placed in the heating body and is in close contact with the heating body, the non-magnetic heating piece is attached to thesurface of the heating body through the heat conduction silica gel, and the resistance change of the non-magnetic heating piece serves as a feedback signal to be fed back to the heating system based on digital PID control to achieve temperature control over the atomic air chamber. The resistance change of the non-magnetic heating sheet is detected to realize the stable control on the uniform temperature distribution of the heating system. The temperature control method provides a new temperature measurement and control method, does not need to introduce an additional thermoelectric coupler fortemperature measurement, and solves the problems of inaccurate air chamber temperature measurement, uneven temperature distribution, magnetic field effect of measured current and the like. And the temperature control system can control the temperature of the air chamber more accurately.

Magnets and magnetic particle-labeled reagents are used to capture and / or release magnetic particle-tagged entities for immunohematology diagnostic testing purposes, especially tests performed in blood banking. The magnetic tagged entities may be tagged antibodies, tagged blood cells, tagged universal binding partners, especially tagged lectins and tagged Coombs reagent, and other binding agents such as biotin-avidin, Protein A or G, ligands and their receptors and the like. Separation of unbound material from bound material is effected through the use of one or both the magnetic field effect on the magnetic labeled reactants and the density gradients of layers of an assay construct. Constructs such as chromatographic strip lateral flow format, and liquid phase reactions in suitable vessels with end point determinations that do not require centrifugation to detect reacted entities. Readable labels such as enzymes, fluorophors, chemiluminescent materials, radioactive isotopes, and other labels may be attached to Coombs reagent to provide a readable product of the Coombs reagent with any antibody participating in the assay.

The present invention relates to artificial fishing rock, and is especially box-type inkfish spawning reef for inkfish to spawn. The box-type inkfish spawning reef includes rectangular frame, white PVC plastic boards outside the frame and with circular holes, and nets inside the frame to constitute spawning rooms, and magnets fixed inside the plastic boards to produce biological magnetic field effect. The present invention has the phototaxis and hole entering characteristic of jellyfish and magnetic field effect utilized, and has the features of stable structure, simple making, low cost, easy management, etc.

The invention relates to a magneto-chromic self-orienting photonic crystal ball and a preparation method thereof. Pre-polymerized liquid prepared from monodispersed superparamagnetic nano crystal druse colloid core-shell composite particles, a polymerization monomer, a cross-linking agent, a photoinitiator, a surface active agent and dispersion liquid is dropwise added to an oil phase, liquid drops are cured under the effects of an externally applied magnetic field and ultraviolet light, the photonic crystal ball is taken out after reaction, and washing and solvent replacement are performed. The magneto-chromic self-orienting photonic crystal ball has the advantages that the preparation, regulation and control method is simple and good in repeatability; a solid-liquid coexisting structure is always kept, the magneto-chromic self-orienting performance can be also kept; the mass center of the photonic crystal ball does not coincide with the center of the ball, so that the photonic crystal ball show self-developing characteristics without an externally applied magnetic field effect, more energy is saved by adopting self development compared with traditional magnetic field induced developing, and controllability is good.

An apparatus for performing cerebral micro-dialysis to treat neurological disease of a patient's brain includes a catheter for implantation in or near the patient's brain, an implantable pump communicated with the catheter to transport cerebrospinal fluid (CSF) from the patient, which CSF contains diseased cells or biomolecules associated with the neurological disease, and an implantable separation device communicated with the pump wherein the diseased cells or biomolecules are removed, where the separation apparatus includes a dialysis membrane impregnated with an antibody, a reversible electrostatic filter, and / or a magnetic field effect fractionation chamber wherein a magnetically-tagged antibody scavenges and aids in the removal of circulating diseased cells or biomolecules from the CSF.

This invention discloses a silver / magnetic nanometer particle that has bacteriostatic effect and its preparation method. In aqueous phase of antiphase micro emulsion liquid system, silver nitrate cream uses magnetic ferroso-ferric oxide nanometer particle as inside core. Deposit simple substance silver on surface of ferroso-ferric oxide nanometer particle, prepare silver / magnetic nanometer particle having nucleocapsid structure. Silver / magnetic nanometer particle of this invention is of easy preparation method, good particle dispersibility, and uniform particle diameter. Simple substance silver of nanometer particle surface has good bacteriostatic effect. Ferroso-ferric oxide inside core of particle makes this nanometer particle have good magnetism by outside magnetic field effect. It can be convenient to reclaim and reuse from sample product that is bacteriostaticly processed.

The invention relates to a preparation method and an application for magnetic molecular imprinting polymers for selectively separating carbamazepine and belongs to the technical fields of environmental material preparation and pollution regulation. Nanometer ferroferric oxide modified on a surface of chitosan serves as a magnetic medium, molecular imprinting material polymerization is carried out on the surface of the nanometer ferroferric oxide by using a sediment polymerization method, and a magnetic molecular imprinting adsorption agent is obtained after template molecular carbamazepine is eluted. Obtained molecular imprinting composite materials are stable in physicochemical property, have high adsorption capacity and specific identification characteristics on the carbamazepine, have superparamagnetism, can be rapidly separated under an outside magnetic field effect, therefore, interference of a complex substrate in an actual sample is avoided, and sample treatment processes are greatly simplified. The preparation method is simple, reliable and low in cost and has a wide application prospect in analysis, detection and pollution treatment of a complex environment sample.

The disclosure concerns eyeglasses with an integrated magnetic clip for removably attaching the eyeglasses to a wearer's clothing, a vehicular sun visor, or other object. The eyeglasses may embody any wearable optics device, such as, prescription glasses, reading glasses, sunglasses, and the like. In some embodiments, the eyeglasses further include a shield element positioned between a magnetic element of the magnetic clip and a wearer's body for reducing or eliminating magnetic field effects on the body of the wearer.

The invention relates to a magnet displacement sensor, which is used for measuring displacement of a magnet without contacting with the sensor and comprises a plurality of magnetic sensitive elements, a strip-shaped supporting part and a detecting circuit. The magnetic sensitive elements are fixedly arranged on the strip-shaped supporting part and are arranged at certain intervals along a length direction to form a uniformly distributed linear array, each interval ranges from 1 millimeter to 20 millimeters, an input end of the detecting circuit is connected with the magnetic sensitive elements so as to detect output statuses of the magnetic sensitive elements within a range of a magnetic field effect when the magnet moves along the length direction parallel to the strip-shaped supporting part, and an output end of the detecting circuit is provided with a communication interface. The magnet displacement sensor can realize automatic intelligent measurement, and has the advantages of simplicity in structure and low cost.

The invention discloses a discharging electrode structure generated by vacuum plasmas based on magnetic field effects, which is placed in a vacuum environment and comprises a cathode, an anode and an insulated part, wherein the cathode comprises a metal cylinder, one end of the metal cylinder is provided with a circular cone, and the cone end of the circular cone serves as a discharging end of the cathode; the insulated part comprises a tubular insulated part sleeving and coating the cathode, and one end of the tubular insulated part is provided with a horn-shaped radial insulated part; the anode comprises a ring anode and a spiral tube-shaped anode; one end of the tubular insulated part is connected with the horn-shaped radial insulated part via the ring anode; a single layer or multiple layers of metal wires with insulation is or are spirally wound on the insulated part to form the spiral tube-shaped anode; axes of the ring anode and the spiral tube-shaped anode and the cone end center line of the cathode circular cone are kept to be coincident; and the cathode is connected with a negative high-voltage terminal of an external circuit via a wiring column, one end of the spiral tube-shaped anode is directly connected with the ring anode, and the other end of the spiral tube-shaped anode is grounded via a wire.

The invention discloses a magnetostriction-based fiber weak magnetic field detection system. A laser device serves as a light source; laser outputted by the laser device passes through an isolation device and arrives at a first coupler; and then the laser is split into two beams; and one path of beam enters fibers of a sensing arm and a reference arm. The sensing arm serves as a system magnetic field sensitive part; the fiber surface of the sensing arm is coated with a magnetostrictive material; under an external magnetic field effect, the stress changing with the magnetic field is generated inside the magnetostrictive material and then is transmitted to the fiber of the sensing arm to cause a phase change of the laser transmitted in the fiber of the sensing arm, so that a phase differenceis caused between laser transmitted in the sensing arm and the reference arm; the phase difference is transmitted to a detector by a second coupler; the detector detects an intensity interferometer signal and converts an optical signal into an electric signal; the converted signal enters a signal detection circuit for signal processing; the size of an external magnetic field is demodulated by detecting the intensity interferometer signal arriving at the detector; and then an upper computer collects and outputs a measurement result.

A split drain magnetic field effect transistor (MAGFET) includes at least one supplemental gate to exert a lateral electrical field in the channel of the MAGFET. Connection of the supplemental gate in feedback with one of the two drain contacts allows the MAGFET to act as a latch sensitive to the presence of an external magnetic field. Preferably, the MAGFET includes two laterally spaced supplemental gates, allowing for the detection of an external magnetic field and its orientation.

The invention relates to a parking space detection system and method based on double parking detectors. The parking space detection system based on the double parking detectors is mainly characterized by comprising a parking space detection server, a wireless parking space detection network and the parking space detectors, the parking space detection server is connected with the parking space detectors through the wireless parking space detection network, and each of two sides, close to side lines of each parking space, is provided with one parking space detector. The parking space detection method includes the steps: using the two parking space detectors, on the side lines of each parking space, for detection; judging the state of the parking space is unchanged when detection values, of the two parking space detectors on the side lines of one parking space, hop within different time; using a matching detection method for the detection of the parking space when the detection values, of the two parking space detectors on the side lines of one parking space, hop at the same time. The parking space detection system and method based on the double parking detectors is reasonable in design and capable of effectively solving the problem of misjudgment due to vehicle magnetic field effect of the neighboring parking spaces which are arranged in a parallel mode, and accordingly detection precision is improved.

A method of controlling the coordinate sensitivity in a superconducting microbolometer employs localized light, heating or magnetic field effects to form normal or mixed state regions on a superconducting film and to control the spatial location. Electron beam lithography and wet chemical etching were applied as pattern transfer processes in epitaxial Y—Ba—Cu—O films. Two different sensor designs were tested: (i) a 3 millimeter long and 40 micrometer wide stripe and (ii) a 1.25 millimeters long, and 50 micron wide meandering-like structure. Scanning the laser beam along the stripe leads to physical displacement of the sensitive area, and, therefore, may be used as a basis for imaging over a broad spectral range. Forming the superconducting film as a meandering structure provides the equivalent of a two-dimensional detector array. Advantages of this approach are simplicity of detector fabrication, and simplicity of the read-out process requiring only two electrical terminals.

The present invention relates to a magneto-optical sewage treatment apparatus, and belongs to the field of sewage treatment equipment. The apparatus comprises a housing, a water inlet, an agent addition port, a static pipeline mixer, a motor, a stirring paddle, an ultraviolet lamp, a magnetic field, an effluent baffle, a water outlet, a mud discharging pipe, a control valve, a magnetic separator, a control valve, a mud outlet, a magnetic flocculant reflux pump, a conveying pipe, a control valve and a three-way pipe. According to the present invention, based on a combination effect of photocatalysis and magnetic flocculation of a magneto-optical catalysis material, under a controlled magnetic field effect, one part of polluting substances in sewage is degraded through photocatalysis, the other part of polluting substances in sewage forms a magnetic floc, and the magnetic floc is subjected to rapid sedimentation removal so as to achieve a sewage purification effect; a magnetic separation device and a conveying device are adopted to achieve separation and recovery utilization of the magneto-optical catalysis material and the magnetic flocculant; and with the magneto-optical sewage treatment apparatus, photocatalysis, flocculation, precipitation and magneto-optical catalysis material recovery utilization are integrated, and characteristics of simple structure, convenient operation, significant treatment and small occupation area are provided.

The invention discloses a magnetic-field forward modeling system for a three-dimensional moving object. The magnetic-field forward modeling system comprises a three-dimensional modeling module used for establishing a three-dimensional model of a magnetic object, a printing and pre-processing module, a printing control module and a magnetic-field forward modeling module. A magnetic-field forward modeling method comprises the following steps of: establishing the three-dimensional model of the three-dimensional moving object through the three-dimensional modeling module, and storing data of the three-dimensional model as an STL file; slicing the three-dimensional model through the printing and pre-processing module, and generating a G-code file; decoding the G-code file through the printing control module, and getting an interpolating point on a printing path; and completing magnetic-field forward modeling by calculating the magnetic-field effect of magnetic dipoles and superposing the effect of each magnetic dipole. According to the magnetic-field forward modeling system and the method disclosed by the invention, operation steps are simple, and time needed for forward modeling and internal storage are independent of complexity of a motion mode and motion.

The invention discloses a preparation method of a magnetic immobilized cellobiase nano mesoporous material, which comprises the following steps: a sol forming step: dilute acid is taken as a catalyst for hydrolyzing tetraethoxysilane to form transparent sol, ethanol is dissociated from the sol until mass content is less than or equal to 5%; and a gel forming step: a template solution, a cellobiase buffer and magnetic nanoparticles Fe3O4 in sol under stirring, adjusting a system to neutrality by a dilute alkali solution, and placing to generate the gel. The invention also discloses the magnetic immobilized cellobiase nano mesoporous material prepared by the method. aperture of a nano medium material obtained by the method is about 2-7 nm, so that specific surface area is high; the nano medium material can be gathered in short time under magnetic field effect, so that recovery and usage are convenient; and the nano medium material has the advantages of high biological activity and reutilization.

The invention discloses a preparation method and application of a magnetic material for surface finish benzene sulfonic acid. The preparation method comprises the steps of adopting FeCl3 as a raw material, enabling ethylene glycol to serve as a disperse system, enabling anhydrous sodium acetate to serve as a reducing agent, and utilizing a hydrothermal method to prepare ferroferric oxide magnetic microspheres; then dispersing the ferroferric oxide magnetic microspheres into ethanol / water mixed solution, adding ammonia water and tetraethoxy-silicane, enabling tetraethoxy-silicane to undergo hydrolytic polymerization on the surfaces of the magnetic microspheres, and obtaining an core-shell magnetic material; dispersing the core-shell magnetic material to mixed solution of toluene and N,N-dimethylformamide after drying, adding 2-(4-chloride sulfonyl phenyl)-ethyl trimethoxy silane, and obtaining the magnetic material for surface finish benzene sulfonic acid by a silanization reaction. The magnetic material has rich active groups, can be dispersed stably in solution, is renewable and can be recycled. The magnetic material serves as an adsorbent, is large in surface area and strong in selectivity, weakly alkaline compounds can be adsorbed from a matrix by strong electrostatic interaction of sulfo groups and hydrophobic interaction of a benzene ring, and rapid separation and enrichment can be achieved by simple magnetic field effect.

The invention discloses a method for boosting crystallization of a phase-change cold-storing material of a eutectic salt solution. The method comprises the following steps: mixing 100 parts of eutectic salt solution with a mass concentration of 10-26.4% with 0.1-1.2 parts of magnetic metal nanometer particles or magnetic metal oxide nanometer particles, and then adding 0.2-0.6 parts of surface dispersing agent, and ultrasonically treating for more than 30 minutes, thereby obtaining a suspended low-temperature phase-change cold-storing material of the eutectic salt solution. An electromagnetic coil is uniformly wound on an outer wall around a cold-storing tank; a direct current is introduced; the direction of a generated magnetic field is opposite to the direction of gravity; and the strength of the magnetic field is adjusted by changing the size of a voltage. According to the method provided by the invention, the magnetic nanometer particles and the magnetic field effect are utilized to strengthen the heat-transfer characteristic of the traditional cold-storing material of the eutectic salt solution, the nucleating condensate depression is improved, the crystallizing time is shortened, the cold-storing efficiency is increased, and meanwhile, the volume of a heat exchanger is reduced.

The invention relates to an eddy current retarder device based on the magnetorheological effect. The eddy current retarder device comprises rotor discs, a stator assembly, a transmission shaft and magnetorheological fluid. The stator assembly comprises a bearing sleeve, stator shells and the like and is located in the middle, the two rotor discs are placed in the stator shells on the two sides of the stator assembly respectively, and gaps between the shells and the rotor discs are filled with the magnetorheological fluid. Eight excitation devices are respectively fixed to the inner side shell of the stator shells on the two sides. Through the structure, air gaps between rotors and a stator are replaced by the magnetorheological fluid with high magnetic permeability and low electrical conductivity, and therefore magnetic circuit magnetic resistance is reduced; meanwhile, under the magnetic field effect, the magnetorheological fluid is converted from Newtonian fluid with low viscosity into Bingham fluid with high shear yield stress. In the brake process, the brake torque generated by eddy currents and the brake torque generated by the magnetorheological fluid act at the same time. The eddy current retarder device with the structure has the advantages of being capable of saving energy and electricity, small in coil heating amount, large in brake torque, and good in brake torque controllability and low-speed performance.

The invention discloses an atomic interference gravity measuring device based on a double-matter wave source, and belongs to the technical field of atomic interference and gravity exploration. The device comprises a vacuum chamber which is used for providing a sealed container for atomic steam and providing a vacuum environment with the vacuum degree being 10<-8>-10<-7>Pa for the preparation and manipulation of cold atoms. There are two cold atomic cloud preparation structures which are at the same end of an interference area. The device has a simple structure. The center of gravity of the device is low when the device is in a surface working environment. The device is simply supported, and is of high stability. The two cold atomic clouds share a detection laser and a photoelectric detector in the vacuum chamber of a detection area, so that the system complexity is reduced, and common-mode detection error is restrained. Interference is completed in the same slender vacuum chamber, and a magnetic field shielding material can be wrapped easily. There is no cold atom preparation structure between the two atomic clouds. The device has a small self-gravitation effect. Space is reserved for an additional gravity source to calibrate the measurement result. The device needs only one set of detection system, and has good magnetic field effect restraining performance and low quantum projection noise.

An MRAM cell having an MTJ stack with a free layer and an interconnect configured to generate a spin current and a magnetic field effect that is used to affect the magnetic moment of the free layer. The interconnect may comprise a Spin Hall lead. The interconnect may comprise an antiferromagnetic material. An MRAM cell array may include a plurality of bit elements each configured to store at least one bit, an interconnect coupled to the plurality of bit elements, and a transistor formed at a periphery of the MRAM cell array and configured to supply a current to the plurality of bit elements via the interconnect. The interconnect may be configured to generate a spin current and a magnetic field effect that is used to affect the magnetic moment of the free layer of each of the plurality of bit elements.

The invention relates to a portable far infrared low-voltage electric heating magnet therapy and traditional Chinese medicine physical therapy band. The therapy band mainly comprises a low-voltage power supply battery, a permanent magnet sheet, a high-energy electric heating material which can radiate 4-14 micrometer far infrared rays, and a traditional Chinese medicine dressing bag, wherein the permanent magnet sheet and the high-energy electric heating material are fixedly arranged a girdle which is made of an elastic sports textile fabric, the traditional Chinese medicine dressing bag is detachably arranged on the girdle and the power supply battery is electrically connected with the high-energy electric heating material to supply electric energy to the therapy band. After the therapy band is electrified, heat and far infrared rays can be produced, wherein the far infrared rays can harmoniously resonate with body tissues, the produced heat can heat the traditional Chinese medicine dressing bag to enable liquid medicine in the traditional Chinese medicine dressing bag to be evaporated and guided into a human body, and the permanent magnet sheet can act on the human body through the magnetic field effect and have an effect on micro-current and charge particles in the human body. Therefore, the product provided by the invention has quadruple curative effects, i.e. thermal therapy, magnet therapy, far infrared physical therapy and traditional Chinese medicine fumigation.

The invention provides a drum washing machine. The drum washing machine comprises a shell, an outer drum and an inner drum, the outer drum and the inner drum are arranged in the shell, and the inner drum is rotatably mounted in the outer drum. The drum washing machine further comprises magnets and suspension windings, the magnets are mounted on the inner drum, and the suspension windings are mounted on the shell and used for generating a first magnetic field effect on the magnets to make the inner barrel suspend. In use of the drum washing machine, the suspension windings are electrified to generate a first magnetic field which acts on the magnets, and then the magnets support the inner drum to make the inner drum suspend. When the inner drum rotates, balance of the inner drum can be adjusted by adjustment of the magnetic field of the suspension windings, so that parts including damping springs, damping counter weights and the like are saved, and mass of the drum washing machine is reduced; on the other hand, due to saving of the damping springs, the problem of proneness to damages of the damping springs in long-time use of the drum washing machine can be avoided.