54results about How to "Control magnetism" patented technology

A method for preparing indium oxide nanometer crystal with controllable shape is provided, which is characterized in that methyl alcohol or ethanol solution in form of compound of indium is taken as precursor, alcoholysis is carried out in methyl alcohol or ethanol solution containing NaOH or KoH, then the alcoholized suspension is placed into a reaction vessel to carry out super alcohol thermal reaction. The indium concentration percentage by mass in the precursor is 0.5-10%, or the adulterant in the precursor is 0.1-10at%, the transitional metallic ions are prepared into non-doped or doped indium oxide nanometer crystal, which is in cubic or bar shape, the yield is up to 80%. The magnesium of the doped In2O3 can be adjusted by the doping volume, alcohol thermal time and temperature.

The invention relates to a customized cabinet door plank edge banding processing method. A workbench, a belt type conveyor, a conveying device and an edge banding machine are used in the method, the belt type conveyor is mounted at a left side of the workbench, a rectangular push board is uniformly and fixedly arranged at an external surface of the belt type conveyor, the conveying device is mounted at an upper end of the workbench, the edge banding machine is mounted at a front end of the workbench, the edge banding machine comprises a glue box, a flow guiding tube, a glue spreading frame, anaccommodating disk, a fixed column, a guiding frame, a motor 2 and an extrusion frame. According to the method provided by the invention, a plank is conveyed and located through the conveying device,meanwhile, the edge banding machine performs edge banding for the plank, overflowing glue is scraped and cleaned, simultaneously, sealing strips at left and right ends of the plank are cut, cutting again later is avoided, waste of the sealing strips is reduced, utilization rate of the sealing strips is improved, and processing cost is reduced.

The invention belongs to the technical field of preparation of inorganic nonmetal nanocomposite materials, and concretely relates to a preparation method of magnetic Fe2O3 / Fe3O4 nano-heteroplasmon particles. The method adopts metal iron salt, alcohol and an alcohol-soluble organic matter as raw materials, and comprises the following steps: adding the iron salt to alcohol or the alcohol-soluble organic matter according to a ratio of the iron salt to the alcohol of 1mol / 7mL or less, stirring for dissolving to prepare a sol solution, igniting and combusting the sol solution in air to prepare a gel, calcining the gel at 150-450DEG C under a heating rate of 0.5-15DEG C / min for 0.1-12h, and naturally cooling to prepare the magnetic Fe2O3 / Fe3O4 nano-heteroplasmon particles. The preparation method has the advantages of simple technology, convenient operation, easy process control, wide sources of the raw materials, low cost, environmental protection, low requirements on a required device, uniform diameter distribution of the particles, and convenience for large-scale industrial production. The microstructure and the morphology of the particles can be conveniently controlled by adjusting process factors and the chemical composition in order to control the performances of the particles.

The invention discloses metal alloy-metal oxide double magnetic shell-core structure nanocrystal and a preparation method and application thereof. The metal alloy-metal oxide double magnetic shell-core structure nanocrystal comprises a core region and a shell layer, and the core region is wrapped with the shell layer. The core region is made of a metal alloy, and the shell layer is made of a metaloxide. The preparation method comprises the following steps that a precursor of the metal alloy and a precursor of the metal oxide are mixed in the same reaction vessel under the protection of an inert atmosphere, and an oil phase high temperature thermal decomposition method is adopted for reaction to obtain the metal alloy-metal oxide double magnetic shell-core structure nanocrystal. The metalalloy-metal oxide double magnetic shell-core structure nanocrystal is synthesized by a one-pot synthesis method, a shell-core structure can be adjusted from the size and shape, and shell-core double magnetic nanocrystal with different compositions can be further synthesized in general. The metal alloy-metal oxide double magnetic shell-core structure nanocrystal has the characteristics of simpleness, high efficiency and low cost, and mass synthetic metal alloy-metal oxide double magnetic shell-core structure nanocrystal with good monodispersity and super-controllable magnetic properties can beprepared.

The invention discloses a magnetic conduction block, which comprises alternately arranged permalloy plates and nickel-bronze alloy plates; adjacent permalloy plates and nickel-bronze alloy plates are bonded and pressed together by a metal adhesive. The invention also discloses a press for making the above-mentioned magnetic block, which includes a bottom plate on which several T-shaped grooves are arranged, and front and rear slide rails are respectively fixedly connected to the two T-shaped grooves in the middle of the bottom plate; the front and rear slide rails There is a support seat in the middle of the center, and a hydraulic cylinder is provided on the support seat. The left end of the extension rod of the hydraulic cylinder is fixedly connected with a pressure lining, and the pressure lining is fixedly connected with a liner; the liner is fixedly connected with a push plate, and the push plate is downward. Two slide blocks are fixedly connected, and the two slide blocks are respectively connected to the left end of the upper bottom plate of the front and rear slide rails and are fixedly connected with a support. The magnetic permeable block of the present invention can control the magnetic performance relatively easily, and improve the service life and the magnetic permeable effect of the magnetic permeable block. The press machine of the invention has simple structure, low cost, large clamping force on the magnetically permeable blank, and can work stably for a long time.

The invention provides an automatic accurate assembling assembly for an oil pump. The automatic accurate assembling assembly for the oil pump comprises a base, an assembling cylinder, an extrusion mechanism, a compression groove and a rotary suction mechanism. The extrusion mechanism comprises an extrusion block and an overturning assembly. The rotary suction mechanism comprises a rotary assemblyand a discharging assembly. According to the automatic accurate assembling assembly for the oil pump, the extrusion block is rotatably connected to a pushing end of the assembling cylinder, and the extrusion block can rotate to be horizontal. After one-time assembling of oil pump springs and an oil pump shell, an oil pump cylinder retracts, and the extrusion block is driven to be horizontal by theoil pump cylinder; and besides, the extrusion block is magnetized through an electromagnet, and the oil pump springs output by the discharging assembly is sucked by the extrusion block. When the assembling cylinder pushes, the extrusion block is vertically arranged and loses magnesium; the oil pump springs fall onto a bearing base accurately; the technical problem of accurate feeding of the oil pump springs is solved; horizontal placement of the oil pump springs is achieved; moreover, the oil pump springs are fed automatically; and working efficiency is higher.

The invention provides a preparation method of a nanocrystal containing manganese and fluoride compounds. The preparation method comprises the following steps: firstly, dissolving alkali into an alcohol-water solution, then adding organic compounds CH3(CH2)nCOOH and / or CH3(CnH2n-2)COOH, and uniformly mixing to obtain an alcohol-water-oil reaction system, wherein n is greater than or equal to 6 and smaller than or equal to 18; secondly, adding an aqueous solution containing Mn<2+> and F<-> into the alcohol-water-oil reaction system, and then carrying out a reaction at the temperature of 25 to 200 DEG C to obtain the nanocrystal containing the manganese and fluoride compounds; adding rare earth ions into the second step to obtain a rare earth ion-doped nanocrystal containing the manganese and fluoride compounds. According to the method, a solid or hollow nanocrystal with smaller size, uniform particle size and high crystallinity degree is directly prepared according to a one-pot method; a solid and hollow structure of the nanocrystal is regulated and controlled by regulating and controlling the proportion of alcohol-water-oil and distribution of the Mn<2+> and the F<-> in the alcohol-water-oil; by regulating and controlling doped rare earth ions, upconversion and downconversion regulation and control of monochromatic emitted light of the nanocrystal are realized; in addition, regulation and control of magnetic properties of the nanocrystal also can be realized.

The invention relates to a preparation method of a samarium-cobalt permanent magnet material. A traditional 2:17 samarium-cobalt sintered magnet which cannot easily absorb hydrogen to break is prepared by combining a double-alloy technology and a hydrogen breaking technology. The method specifically comprises the following steps: (1) preparing a first alloy ingot with high iron content and low rare earth content and a second alloy ingot with high rare earth content and low iron content according to the ratio of various elements respectively; (2) carrying out hydrogen absorption and dehydrogenation on the first alloy ingot under 0.3-0.45MPa first hydrogen pressure to obtain first hydrogen broken powder, and carrying out hydrogen absorption and dehydrogenation on the second alloy ingot under 0.2-0.35MPa second hydrogen pressure to obtain second hydrogen broken powder; (3) carrying out airflow milling on the first hydrogen broken powder and the second hydrogen broken powder respectively to obtain first alloy powder and second alloy powder; and (4) mixing the first alloy powder and the second alloy powder evenly, and sequentially carrying out orienting compression, sintering solid solution and aging treatment to obtain the samarium-cobalt permanent magnet material.

The invention discloses a stamping part clamp which comprises a U-shaped plastic clamp body (1), wherein a button cell (4) is arranged in the plastic clamp body (1), an electromagnet (3) is installed on the inside (close to an opening) of the front end of the plastic clamp body (1), a power switch (2) is arranged on the external surface of the plastic clamp body (1), the button cell (4) is connected with a wire lead-out end of the electromagnet (3) by the power switch (2), and an antislip groove (5) is also arranged on the surface of a holding part at the rear end of the plastic clamp body (1). The clamp is used for taking and putting a stamping part, the electromagnet is arranged on the inside of the clamp, the switch which controls the electromagnet to own magnetism or not is arranged on the outside of the clamp and can control the magnetism of the electromagnet at any time, the stamping part taking and putting efficiencies are improved, and the clamp is simple in structure, is easy to implement and has a good application prospect.

The invention relates to an Al<3+>-doped Bi2Fe4O9 multiferroic ceramic material and a preparation method thereof. A citric acid-nitrate sol-gel process is adopted through high-temperature treatment to obtain the multiferroic ceramic material of which the molecular formula is Bi2Fe[4-x]AlxO9 (x=0, 0.2, 0.4, 0.6). The ceramic material has single-phase structure and room-temperature multiferroic property, and the room-temperature magnetism and ferroelectricity of the material can be adjusted by changing the doping amount of the Al<3+>. The method has the advantages of simple preparation technique, low sintering temperature, short sintering time, low cost, no need of reducing atmosphere, environmental protection, no toxicity and no pollution.

The invention discloses high-resistance magnetic powder, and a bonded magnet and a preparation method thereof. The high-resistance magnetic powder is prepared from the following raw materials in partsby weight: 100 parts of magnetic powder and 0.1-10 parts of insulating resin, wherein the magnetic powder is one or a mixture of two of NdFeB magnetic powder and SmFeN magnetic powder, the weight ratio of the insulating resin to the magnetic powder is (0.1-10):100, and the insulating resin wraps the surface of the magnetic powder. The invention also discloses a process method for preparing the bonded magnet. The method comprises the following steps of: uniformly mixing the high-resistance magnetic powder and the binder in proportion to obtain a bonded magnet mixture; and processing and forming the bonded magnet mixture to obtain a magnet blank; and then, completing curing to obtain the bonded magnet. The bonded magnet provided by the invention can meet the conditions that the magnet has relatively the strong magnetic performance and relatively high resistivity at the same time, so that the output power and efficiency of the motor are improved.

The invention relates to a system and method for measuring the concentration of impurities in a solid. The measuring system comprises a spinning electron magnetic sensor, a magnetic field generating device, and a controller. The magnetic field generating device is arranged on the lateral side of the spinning electron magnetic sensor, and a distance with a predetermined value exists between the magnetic field generating device and the spinning electron magnetic sensor. The spinning electron magnetic sensor detects the primary magnetic field strength of a magnetic field generated by the magneticfield generating device. A solid to be detected is arranged on the surface of the spinning electron magnetic sensor. The spinning electron magnetic sensor detects the current magnetic field strength.The controller determines the impurity concentration of the solid according to the corresponding relationship between preset magnetic field strengths and solid impurities concentrations, the primarymagnetic field strength, and the current magnetic field strength. The system and method have the advantages that the operation is simple, the method is easy to realize, and the detection efficiency and detection precision are both improved.

The invention discloses a fabrication process of a magnetic guide block. The fabrication process is sequentially performed according to the following steps of 1, fabricating a blank, wherein the step comprises fabricating a permalloy blank and fabricating a nickel bronze alloy blank; 2, grinding in a thickness direction; 3, grinding in a width direction; 4, coating, in which metal adhesives are uniformly coated on surfaces of each permalloy blank and each nickel bronze alloy blank, and each permalloy blank and each nickel bronze alloy blank form a magnetic guide blank; 5, laminating; and 6, fabricating a finished product. The fabrication process of the magnetic guide block has the advantages that the permalloy blank and the nickel bronze alloy blank are conveniently fabricated to form the magnetic guide block by operations such as grinding, pasting and lamination, expensive equipment and auxiliary materials are not needed, the cost is reduced, the demand of fabricating the permalloy blank and the nickel bronze alloy blank to from the magnetic guide block is also satisfied, and the magnetic block with longer service lifetime and better magnetic guide effect can be fabricated.

The invention discloses a preparation method of a magnetic polymer microsphere. The preparation method includes the steps of: adding a polymer seed into an aqueous solution containing a stabilizer andan initiator, and stirring the substances uniformly to form a uniformly dispersed seed suspension; mixing ferric oleate and a monomer uniformly to form a ferric oleate monomer solution; enabling theferric oleate monomer solution to form uniform liquid drops through a nozzle and enter the seed suspension, letting the seed absorb the liquid drops for growth and one-step polymerization so as to obtain ferric oleate polymer microsphere; and raising the temperature to decompose the ferric oleate so as to obtain the magnetic polymer microsphere. The magnetic polymer microsphere prepared by the method provided by the invention not only can control the magnetic performance of the microsphere, but also can further improve the particle size uniformity of the microsphere, moreover, the yield, efficiency and stability of the magnetic polymer microsphere are improved, and the method is suitable for large-scale production.

The invention relates to the technical field of wind generation and particularly relates to a machine head positioning device for a wind generator. The machine head positioning device comprises a tower column and a hand piece, wherein the machine head is arranged above the tower column; a cylinder is vertically fixed at the top end of the tower column; an annular guide rail is arranged on the sidesurface, far away from the tower column, of the cylinder, a connecting rod is arranged in the cylinder and is vertically fixed on the tower column; a pivotal bearing sleeves the top end, far away from the tower column, of the connecting rod, a groove is formed in the side surface, close to the tower column, of the machine head, and the pivotal bearing is fixedly arranged in the groove; and fixedseats are fixed on the machine head on two sides of the pivotal bearing, and pulleys are connected to the fixed seats through rotating shafts. The machine head positioning device is simple in structure and convenient to operate; and the machine head can be limited while not rotating, so that the machine head of the wind generator is deviated from the wind direction under the wind action.

The invention belongs to the technical field of magnetic stirring, and relates to a preparation method of one-dimensional nano magnetons with stable solution dispersity. The preparation method comprises the following steps: preparing a water-soluble carbon nanotube carrier by adopting a concentrated acid oxidation method or water-soluble macromolecule coating method; immobilizing Fe3O4 nanoparticles on the surfaces of water-soluble one-dimensional carbon nanotubes which can be stably dispersed in water in an electrostatic adsorption-in-situ reduction growth manner, so that the prepared one-dimensional nano magnetons possess stable dispersity in water, magnetic stirring can be achieved in a micro-nano scale and a confinement micro-space, and the magnetism of the one-dimensional nano magnetons is controlled by controlling the size and distribution density of Fe3O4 nano particles on the surfaces of the water-soluble carbon nanotubes.

The invention discloses a damping structure and a damping method for a wave-permeable breakwater. The structure comprises three grooves in a row formed in the top of a wave baffle plate of a breakwater; the left groove, the right groove and the intermediate groove communicate with one another through transverse hole channels; a hydraulic system and a telescopic rod which is controlled by the hydraulic system and vertically and upwards extends out of the groove are mounted at the bottom of each of the left groove and the right groove; cushion blocks for jacking the telescopic rods are arrangedon the side walls, opposite to the hole channels, of the left groove and the right groove; a pressing machine is mounted in the intermediate groove; pressing rods on the left side and the right side of the pressing machine respectively penetrate through the corresponding hole channels to be opposite to the telescopic rods in the left groove and the right groove; and more than two counterweight pieces are placed between the left groove and the right groove in the top of the wave baffle plate. The damping structure disclosed by the invention is simple in structure, and is convenient and quick toconstruct; based on the principle of a dynamic vibration absorber, the stability of a structure of the wave-permeable breakwater can be remarkably improved, and the structure of the wave-permeable breakwater can be prevented from being damaged because of vibration; and the cost is low, but the damping effect is remarkable.

The invention relates to the technical field of lighting devices, and discloses an illuminating lamp convenient for adjusting illuminating range. The illuminating lamp comprises a shell, the inner wall of the shell is movably connected with a lamp holder, the inner wall of the shell is fixedly connected with a slide rheostat, the inner wall of the shell is in threaded connection with a screw rod, the bottom of the screw rod is fixedly connected with a slide block, a connecting rod is fixedly connected to the outer side of the slide block, a contact piece is fixedly connected to the inner side of the connecting rod, a connecting roller is fixedly connected to the inner wall of the shell, and a leather collar is movably connected to the positions, close to the outer side of the connecting roller, of the inner wall of the shell. According to the illuminating lamp convenient for adjusting illuminating range, by changing the resistance value of the slide rheostat, the situation that a night road cannot be seen clearly due to back-and-forth shaking of illuminating lamps is avoided, the illuminating effect is improved, the safety coefficient of night walking is increased, meanwhile, the illuminating lamps are prevented from falling off, damage or even scrapping of the illuminating lamp is avoided, the service life of the illuminating lamps is prolonged, and resources are saved.

The invention discloses a magnetic control type intelligent flashlight integrating light condensation and light diffusion. The magnetic control type intelligent flashlight comprises a cylinder body, wherein a lampshade is arranged on the side wall of the cylinder body; a bulb is arranged in the lampshade; a flat light plate is fixedly connected to the inner wall of the lampshade; an adjusting mechanism used for dimming is arranged in the cylinder body and the lampshade; the adjusting mechanism comprises an adjusting cavity formed in the cylinder body; an opening communicating with the adjusting cavity is formed in the side wall of the cylinder body; a sliding rod is arranged in the opening; an adjusting block is fixedly connected to the end, located in the adjusting cavity, of the slidingrod; a fixing block is fixedly connected to the inner wall of the adjusting cavity; two conductive strips are arranged on the side wall of the adjusting block in a penetrating mode; a parallel wire group is arranged on the side wall of the fixing block in a penetrating mode; and a cross wire group is arranged on the side wall of the fixing block in a penetrating mode. According to the magnetic control type intelligent flashlight, the convergence degree of light rays of the flashlight can be adjusted according to needs, the flexibility is higher, dust attached to the side wall of the flat lightplate can be blown off, and then the illumination effect of the flashlight is guaranteed.

The invention discloses an unmanned aerial vehicle take-off power assisting device arranged on a wall, and relates to the technical field of unmanned aerial vehicles. The unmanned aerial vehicle take-off power assisting device comprises a shell, a first inner cavity is formed in the shell, a transverse plate is slidably connected in the first inner cavity, a conductive groove is formed in the transverse plate, a conductive rod is fixedly installed in the shell, a placement table is installed on the transverse plate, one end of the conductive rod is slidably connected with the conductive groove, a second inner cavity is formed in the shell, and an electromagnetic block is fixedly installed in the second inner cavity. By arranging an accent light, an illumination plate, a photo resistor, an electromagnetic block, a magnetic block and a fan, the magnitude of current introduced into the electromagnetic block is controlled by shielding the illumination range of the accent light on the illumination plate through the wings of the unmanned aerial vehicle, so that the magnetism of the electromagnetic block can be controlled, and then the output intensity of the fan is adjusted; and the situation that the stability of the unmanned aerial vehicle in the take-off process is affected by too large assisting force of the take-off assisting device is avoided, and meanwhile the situation that the assisting device loses the assisting effect due to too small assisting force is also avoided.

A rare-earth permanent magnet material added with yttrium and a preparation method thereof, the chemical formula of the material is expressed as (Y x RE 1‑x ) a Fe bal m b N c , where, 0.05≤x≤0.4, 7≤a≤13, 0≤b≤3, 5≤c≤20, the balance is Fe, that is, bal=100‑a‑b‑c; RE is the rare earth element Sm or A combination of rare earth element Sm and any one of Zr, Nd and Pr or more, M is Co and / or Nb, and N is nitrogen. The preparation method uses the rare earth Y element to replace the Sm element of the samarium-iron-nitrogen material, and by regulating the ratio of the Sm element to the Y element, the viscosity of the alloy liquid can be reduced, the amorphous forming ability of the material can be enhanced, and the magnetic properties can be improved. The disadvantages of high coercive force and low residual magnetism are improved, and the magnetic properties of the prepared magnetic powder are more suitable for the performance requirements of motor manufacturing for magnets, filling the gap in the performance of magnets for motor applications.

A new energy power generation device disclosed by the invention comprises a central bottom column, wherein the bottom part of the outer surface of the central bottom column is movably connected with a stepped supporting frame plate, the side, away from the central bottom column, of the stepped supporting frame plate is movably connected with a solar power generation panel, an arc-shaped guide groove is formed in the side, away from the stepped supporting frame plate, of the solar power generation panel, and the top part of the central bottom column is movably connected with an auxiliary mechanism; and the auxiliary mechanism comprises a cleaning mechanism, the side, away from the center bottom column, of the cleaning mechanism is movably connected with a water storage mechanism, the bottom part of the outer surface of the cleaning mechanism is movably connected with the solar power generation panel, and the bottom part of the cleaning mechanism is movably connected with the center bottom column. The new energy power generation device relates to the technical field of new energy sources. The new energy power generation device collects external moisture, and the surface of the solar power generation panel is cleaned by using the collected water flow, so that the surface of the solar power generation panel is kept clean, dust and other sundries are prevented from being accumulated, normal contact of light is ensured, and normal operation of the power generation capacity of the solar power generation panel is ensured.

The invention relates to the technical field of nursing beds, and discloses a nursing bed with a getting-up assisting function for old people. The nursing bed comprises a bed body, wherein an electromagnet is fixedly connected to the inner wall of the bed body; a magnetic plate is elastically connected to the inner wall of the bed body; an air bag is fixedly connected to the inner wall of the bedbody and close to the top of the magnetic plate; a fixed rotary table is fixedly connected to the inner wall of the bed body and close to the inner side of the electromagnet; a positive plate is fixedly connected to the inner wall of the fixed rotary table; and a negative plate is fixedly connected to the inner wall of the fixed rotary table. According to the nursing bed with the getting-up assisting function for old people, through contact between an electric contact point and an electric contact plate, based on the principle of a dielectric plate and the electromagnetic principle, the nursing bed can nurse the waist of a patient after rising, so that the injury of the nursing bed to the waist is made up, the old people can get up conveniently, time and labor are saved, the pain brought to the patient is reduced, the recovery of the old people and the patient is facilitated, secondary injury to the old people is prevented, and the condition of the old people is prevented from being aggravated.

The invention discloses an auxiliary stabilizing device for high-rise building cleaning. The device comprises a holding assembly, the holding assembly is a hand holding structure, and the top end and the tail end of the holding assembly are respectively provided with an adsorption assembly and a magnetic suction assembly; and the holding assembly is formed by combining a handle rod, a first flange connecting disc and a supporting rod, the handle rod and the first flange connecting disc form a welded and fixed I-shaped structure, the first flange connecting disc is a flange plate structure, and the adsorption assembly is formed by combining a first fixing block, a first outer clamping plate and a second fixing bolt. The auxiliary stabilizing device for high-rise building cleaning can be used in cooperation with cleaning workers, meanwhile, the stability of the cleaning workers can be conveniently assisted, the influence of the high-altitude environment on the workers is reduced, the work type post of the cleaning technology is reserved, meanwhile, the work risk of cleaning work is reduced, the work difficulty is decreased, and therefore, safe and efficient cleaning operation is realized.

The invention belongs to the technical field of preparation of inorganic non-metallic nanocomposite materials, and in particular relates to a method for preparing magnetic Fe2O3 / Fe3O4 nano-heterogeneous particles. The invention uses metal iron salt, alcohol and alcohol-soluble organic matter as raw materials, and 1 mol iron The amount of alcohol added is not less than 7 mL, stirred and dissolved to obtain a sol solution, and the sol solution is ignited and burned in the air to obtain a gel. The magnetic Fe2O3 / Fe3O4 nano-heterogeneous particles can be prepared by calcining at ℃ for 0.1-12 h and cooling naturally. The preparation method and process of the present invention are simple and convenient, easy to operate, easy to control the process, wide in source of raw materials, low in cost and environmentally friendly, low in equipment requirements, uniform in product diameter distribution, high in yield, etc., and are convenient for large-scale industrial production. In addition, the microstructure and morphology of the product can be conveniently controlled by adjusting process factors and chemical composition, thereby controlling its performance.

The invention discloses a system for active prevent a concrete beam falling phenomenon and an application method thereof. The system involves a concrete beam main beam, wherein a blocking block A anda blocking block B are arranged on the two sides of a cover beam below the concrete beam main beam, the two blocking blocks are embedded with an electromagnet A and an electromagnet B respectively, anelectromagnet C and an electromagnet D are embedded in the positions, attached to the blocking block A and the blocking block B, of the concrete beam main beam respectively, a displacement monitoringdevice A and a displacement monitoring device B are arranged on the electromagnet A and the electromagnet B respectively, the system further comprises a single-chip microcomputer circuit system, allthe electromagnets and the displacement monitoring devices are connected with the single-chip microcomputer circuit system, the single-chip microcomputer circuit system is connected with the electromagnet A, the electromagnet B, the electromagnet C and the electromagnet D to from a circuit, according to the monitoring result of the displacement monitoring devices, the current in the circuit changes the size and orientation, the intensity of the electromagnets is controlled through the size of the current, attraction or repulsion between the electromagnets is controlled through the current direction, so that close fit and separation between the concrete beam main beam with the blocking block A and the blocking block B are realized, bridge falling is prevented, and normal and ordered use ofa bridge is guaranteed.