609results about How to "Avoid mechanical properties" patented technology

The invention discloses a continuous type alloy steel heat treatment line, solving the problem existing in small-section ultra-long material workpiece heat treatment. The continuous type alloy steel heat treatment line is formed by connecting a continuous type roller hearth heating furnace, a roller hearth type quenching groove and electric heating continuous type roller hearth furnace in series.The heat treatment process comprises the following steps of: carrying out austenitization heating on a workpiece in the continuous type roller hearth heating furnace, rapidly discharging after reaching the process time and then entering into the roller hearth type quenching groove; automatically generating a non-continuous water cold process according to the chemical components and different standards of the workpiece, and rapidly cooling through an immersion or spray mode; and tempering the workpiece which is cooled to room temperature according to the process requirement. The continuous type alloy steel heat treatment line has the advantages that: 1, the quenching, solid solution and normalizing continuous heat treatment of the small-section ultra-long material workpiece are achieved, and the heat treatment is completed on roller beds which are located on the same height and axis; 2, a quenching medium is stable in the rising process, and the workpiece can be simultaneously cooled in the length direction; and 3, fire danger and lamp black pollution are precluded by adopting non-continuous water quenching.

The invention discloses a pneumatic crawler-type hydraulic drill carriage which comprises a carriage body, a travelling gear, a working device for drilling connected with the carriage body, a hydraulic system for driving the devices, and an operating device; a pneumatic motor is used as power of the hydraulic system and operation of the drill carriage; an operating device, which adopts closed loop design, is used for driving the pneumatic motor, the pneumatic system, the hydraulic system and the various acting components to act; the travelling device is crawler-typed; a swinging device, which consists of a swinging arm and a cylinder, is arranged at the front of the carriage body; the front end of the swinging device is connected with the working device for drilling by a universal rotating device; the working device consists of a feeding device which comprises a supporting device, a secondary cylinder, and a chain pushing mechanism; and the pneumatic crawler-type hydraulic drill carriage uses a method combining water and gas to clean the boreholes. The pneumatic crawler-type hydraulic drill applies especially to mass drilling work sites of which change continuously; the whole carriage is free of electric devices and the pneumatic crawler-type hydraulic drill applies particularly to high gassy mine and can carry out universal hole drilling.

The invention discloses a laser tailor-welded high-strength steel warm forming preparation method. The laser tailor-welded high-strength steel warm forming preparation method is characterized by comprising the following steps: manufacturing a 22MnB5 steel plate and a medium manganese steel plate into a steel part for later use; carrying out laser tailor-welded connection treatment; carrying out heating treatment on the steel part for later use, which is subjected to laser tailor-welding; transferring the steel part onto a stamping mold to carry out stamping forming and quenching; finally obtaining a two-phase or three-phase microstructure formed by lots of ferrite, martensite or bainite in the 22MnB5 steel area of the tailor-welded steel part; and obtaining a martensite organization structure in the medium manganese steel area, thereby forming a warm forming technology of the laser tailor-welded high-strength steel, which has no need for coating treatment in advance and has gradient distributed mechanical property. The laser tailor-welded high-strength steel warm forming preparation method has the beneficial effects that the process combination of laser tailor-welding and the warm forming technology is realized; the warming forming technology is used for enabling 22MnB5 steel to form the two-phase or three-phase microstructure; the two-phase or three-phase microstructure is matched with medium manganese steel having martensitic structure in the end to obtain a custom-made warm forming part with gradient distributed performances; the technological process is simplified; and the production efficiency is improved.

The invention discloses a non-alignment error correction method used for a geomagnetic element measuring system, which comprises the following steps: (1) a rectangular table-board is arranged and a reference coordinate system for the rectangular table-board is established; (2) a magnetic sensor of the geomagnetic element measuring system and an accelerometer are encapsulated together in a non-magnetic regular hexahedron; two surfaces of the non-magnetic regular hexahedron are attached to two vertical surfaces of the rectangular table-board; and a regular hexahedron coordinate system is established for the non-magnetic regular hexahedron; (3) the non-magnetic regular hexahedron is turned for multiple times, and after multiple times of turning, the non-magnetic regular hexahedron is still attached to the rectangular table-board; (4) multiple sets of measurement values of the non-magnetic regular hexahedron and the accelerometer during the process of multiple times of turning are utilized, and through solving multiple non-linear equations simultaneously, the non-alignment error of the magnetic sensor and the non-alignment error of the accelerometer are calculated; (5) the non-alignment error between the magnetic sensor and an inertial navigation is indirectly calculated to correct the non-alignment error of the measurement value of the magnetic sensor. The method has the advantages of simple principle, facilitation of realization and operation, higher correction accuracy, etc.

The invention relates to a preparation method of a large-diameter aluminum alloy tube, relating to a preparation method of an aluminum alloy tube and aiming to solve the problems in the prior art that the large-diameter aluminum alloy tube with the tube wall thickness less than 2mm and with an excellent performance cannot be prepared with low cost and high production efficiency. In the method, an aluminum alloy rolled plate is obtained at first through blanking with a plate shearing machine, a cylindrical tube blank is prepared with a plate rolling machine, a tube blank to be welded is obtained through clamping with a clamp, mixing friction welding is carried out for welding, a cylindrical welded tube is obtained through rounding, and the large-diameter aluminum alloy tube is obtained finally sequentially through spinning and thermal treatment. The invention has the advantages that: 1, a high-quality spinning blank can be obtained; 2, a large-diameter tube can be prepared; 3, the mechanical properties are good; 4, the number of spinning procedures is reduced, no annealing treatment is needed in the procedures, the production cycle is shortened, and the cost is decreased; and 5, the dimensional accuracy is high. The method is mainly applied in production of the large-diameter aluminum alloy tube.

The present invention relates to a line connector (1) for media lines, comprising a connecting piece (2) having at least one connection section (6, 8) for the connection to a media line (4) or to an assembly, and having a transitional section (10) comprising a flow channel (11), the section adjoining the connection section (6, 8). To this end, electrical heating means (12) are provided at least in the region of the transitional section (10) in an arrangement that at least partially surrounds the flow channel (11). The invention further relates to an assembled media line comprising a pipe line having a heating conductor (29) arranged on the circumference thereof, and a heatable line connector attached to at least one pipe line end of the media line.

The invention discloses a flotation decarburization and direct and reverse flotation process for silicon-calcium mixed collophanite containing organic carbon. The mass percentage of the organic carbon in the silicon-calcium mixed collophanite ranges from 1% to 10%. The flotation process includes sequentially performing flotation decarburization, direct flotation desiliconization and reverse flotation magnesium removal. A flotation decarburization technology includes adding water into the silicon-calcium mixed collophanite containing the organic carbon and crushing and grinding the silicon-calcium mixed collophanite containing the organic carbon to obtain ore pulp with the mass concentration ranging from 20% to 40%; adding collecting agents and foaming agents into the ore pulp and mixing the ore pulp, the collecting agents and the foaming agents with one another; stirring and regulating the pulp and performing flotation on the ore pulp by the aid of a flotation machine to obtain foam products which are tailings containing carbon; implementing a direct flotation desiliconization technology on products in tanks; then sequentially implementing direct and reverse flotation on the products. The flotation decarburization and direct and reverse flotation process has the advantages that organic carbon gangue can be eliminated by means of flotation implemented by the aid of the anionic fatty acid collecting agents and the diethyl phthalate foaming agents, accordingly the content of the organic carbon in the ore pulp can be reduced, consumption of the collecting agents can be decreased, the high quantity of direct flotation foam can be reduced, and the flotation selectivity can be improved.

The invention discloses a technology for the steam explosion treatment of a yellow wood fruit and the comprehensive utilization of grease and flavone thereof, and the like. In the method, the yellow wood fruit is firstly arranged in a steam explosion reactor and is pumped with saturated steam for treatment for 3 to 10 minutes under the pressure condition of 1.4MPa to 2.0MPa; then the mixture is quickly discharged from the reactor for explosion; a blank obtained through the steam explosion is naturally dried or arranged in a drying box for drying; an organic solvent is added for reflux extraction; a rotary evaporator is used for decompressing and evaporation; the solvent is recycled, thus obtaining the oil of the yellow wood fruit. An ethanol liquid is added into the oil meal and then a flavone liquid is obtained through reflux extraction. The remainder after extracting the grease and the flavone are manufactured into active carbon through thermal treatment, thus realizing the comprehensive utilization of the yellow wood fruit.

The invention provides a preparation method of a duramater / spinal dural transplanting substitute which is obtained by repeated freezing and thawing of dural tissue, rolling and cracking of cells, crosslinking fixed protection, accellular antigen extraction, dense surface fibrosis modification, packaging and sterilization, and has the advantages of simple method, wide raw material sources, cheap raw materials, and low cost. The prepared dural substitute completely removes components of cells and other antigen components simultaneously when protecting dural tissue natural structure and properties, is good in biocompatibility, free of immune rejection, safe and reliable, good in mechanical performance, and easy in clinical operation, can meet the needs of defect repair, has the function of promoting tissue regeneration as a loose surface is beneficial to the tissue fluid adsorption, active factor enrichment, and growth of blood vessels and cells, and has the advantages of rapidness in fusion with a host, biodegradable absorption, and good repair effect. The animal test shows that the defect can be completely repaired without brain or spinal fluid leakage, or adhesion with brain tissue, and significant rejection is not found.

The invention belongs to the technical field of heat conduction polymer based composite materials and preparation thereof, particularly relates to a polymer based composite material with a special isolation double-network structure and a preparation method thereof, and provides a heat conduction polymer based composite material. The heat conduction polymer based composite material is prepared from the following components: a thermoplastic polymer, a heat conduction filler A and a heat conduction filler B, wherein the heat conduction polymer based composite material has an isolation double-network structure; the isolation double-network structure is as follows: in the heat conduction polymer based composite material, the heat conduction filler A forms a heat conduction network (1) in the thermoplastic polymer; the heat conduction filler B is adhered to the surfaces of binary blended particles to form a heat conduction network (2) used for isolating the heat conduction network (1) between the binary blended particles; and the heat conduction network (1) and the heat conduction network (2) are connected with each other. The isolation double-network synergy structure built by the prepared composite material has higher synergy efficiency, so that the heat conduction performance of the material is greatly improved.

The invention discloses a power supply soft input controlling method and the controlling device for a walking-beam pumping unit under intermittent power supplying. The method of the invention measures the rotation speed of an electromotor by detecting the residual voltage of a stator winding after blackout when the electromotor supplies power intermittently, can complete the soft input of the power supply within a short time using a silicon controlled rectifier switch component to exert voltage step by step when the real speed of the electromotor approaches the synchronous speed. The controlling device of the invention includes a man-machine interface, a detection unit, a main controller, and a switching component. The invention measures the rotation speed of the electromotor by detecting the residual voltage of the stator winding after blackout, dispenses with a rotation speed sensor, and has high speed and precision. The silicon controlled rectifier component controls the on-off of the intermittent power supply, eliminates the overvoltage during the breakout due to the characteristic that the current is shut down when exceeding zero. Controlling the trigger of the silicon controlled rectifier around the synchronous speed when the electricity is turned on can implement the rapid soft input of the power supply, and then the impact current and the mechanical vibration can be avoided.

The invention discloses high-performance silicon-based thermal-conducting gel and a preparation method thereof. The silicon-based thermal-conducting gel is prepared from organic silicone gel, hydrogen-containing silicone oil, hydroxyl silicone oil and thermal conductive powder, wherein the thermal conductive powder is prepared by polar matching of different kinds of powder according to large, medium and small particle sizes. The high-performance silicon-based thermal gel has excellent thixotropy, high thermal conductivity and good blocking property and is capable of replacing a thermal gel gasket; operation can be carried out by a dispensing machine in application; the production efficiency is greatly improved; a macromolecular structure in thermal conductive mud is connected into a mesh in the fabrication process; seepage of low molecular silicone oil is effectively blocked; and the high-performance silicon-based thermal gel has relatively high high-temperature resistance, is simple and feasible in preparation method, simple to operate in application, safe and reliable.

The invention discloses a power-off protection mechanism of a magnetic suspension rotor support system. The power-off protection mechanism of the magnetic suspension rotor support system is formed by oppositely arranged two identical rotor support converters of the magnetic suspension rotor support system and near-end portions sleeved on rotor shaft levers. Each rotor support converter of the magnetic suspension rotor support system is formed by an axial attraction electromagnet (18), a ring sleeve part (24) and a mechanical bearing, wherein the axial attraction electromagnet (18) adsorbs the ring sleeve part, the ring sleeve part can form axial sliding match with a stator portion (19) of the magnetic suspension rotor support system, the axial attraction electromagnet (18) enables the ring sleeve part to pass through a groove of a central hole, the mechanical bearing is installed on each rotor shaft lever, and a cone-shaped inclined surface is arranged outside an outer ring of the mechanical bearing.

The invention discloses a polylactic acid self-curled and self-bonded composite cigarette tow and a preparation method thereof. The preparation method comprises the following steps: drying polylacticresin; adding a spinning assistant for the polylactic resin into conventional polylactic resin, adding the spinning assistant to polylactic resin containing a plasticizer, and performing melting plasticization to obtain a polylactic resin melt; spraying the melt from a spinneret hole to form single composite fibers; cooling a polylactic acid two-component cigarette tow; oiling the two-component tow, and carrying out drafting and tension heat setting to obtain the polylactic acid self-curled and self-bonded composite cigarette tow. The single fibers in the tow is one of a side-by-side, orange-slice, sheath-core and sea-island composite structures, one of the components of the side-by-side type or the orange-slice type structure is the polylactic resin containing the plasticizer, and the remaining component is the conventional polylactic resin and a composition thereof. The preparation method has the advantages of simplification of the production process, avoiding of mechanical and thermal damages, increase of the rod yield of the polylactic fiber tow, and reduction of the production cost; and the polylactic acid self-curled and self-bonded composite cigarette tow has a good biodegradability.

The invention discloses an electromagnetic vibration generating device of a permanent magnet and application thereof in a vibration detection system, and relates to a device for recycling energy from mechanical vibration to realize energy utilization. The electromagnetic vibration generating device of the permanent magnet is composed of two outer cylinder end covers, a columnar hollow shaft, an inner side coil, a columnar inner cylinder, two fixed annular permanent magnets, a moving annular permanent magnet, a columnar outer cylinder and an outer side coil. According to the invention, the shortcomings that the existing vibration generating device only can collect the vibration energy in the vertical direction and the energy conversion efficiency from the vibration energy to electric energy is relatively low are overcome; the electromagnetic vibration generating device of the permanent magnet is used as a unique power supply of the vibration detection system so that the vibration detection system becomes a self-powered vibration detection system; and the self-powered vibration detection system is combined with a voltage doubling circuit, a wireless transmitting module, a wireless receiving module, a single-chip module and a personal computer, thus the inconvenience of arranging a power supply and a lead outside the traditional vibration detection device is overcome, and a worker can master the vibration conditions without arriving at the site.

The invention relates to an intelligent lab managing system which comprises a control center, and a contract managing module, a task managing module, an experiment managing module, a standard managing module, a financial cost managing module, an equipment sample managing module, a quality review managing module, a training managing module, a client managing module, a system authority managing module and a mechanism managing module which are respectively connected with the control center. The task managing module is connected with the experiment managing module. The control center receives control information input from the outside and controls each managing module connected with the control center according to the control information. Compared with the prior art, the intelligent lab managing system is capable of increasing work efficiency, lowering manpower cost, increasing statistic data accuracy, and the like.

The invention discloses a pneumatic type / mechanical type combined adjustment mach number 0-7 stage combined engine air inlet. The pneumatic type / mechanical type combined adjustment mach number 0-7 stage combined engine air inlet is mainly composed of a high-speed channel, a low-speed channel, a mechanical type variable geometry assembly and a pneumatic type shock wave adjusting assembly. Under the low-speed mode, the mechanical type variable geometry assembly is adopted for adjusting the throat area and the internal shrinkage ratio of the air inlet, and the low mach number starting performance and the high mach number compression performance of the air inlet are guaranteed; and under the high-speed mode, the pneumatic type shock wave adjusting assembly is used for adjusting the precursor shock wave position, the precursor shock wave sealing state is kept, and the discharge coefficient and the working performance of the air inlet are obviously improved within the wide mach number scope. According to the pneumatic type / mechanical type combined adjustment scheme, the compression amount and the precursor shock wave position of the air inlet can be continuously adjusted, it is guaranteed that the combined engine air inlet can effectively work within the wide mach number scope, and the good pneumatic performance is obtained.

The invention discloses a floating technology for effectively reducing pollution of high ash content slime in clean coal, and belongs to an efficient floating method for microgranular coal. According to the technology, a direct flotation technology is firstly adopted to recycle all clean coal and part of high ash content slime floating along with the clean coal, a reverse flotation technology is adopted to enable the high ash content slime obtained through the direct flotation technology and carried in the clean coal to be floated out, and finally, the clean coal which has the qualified quality and meets the clean coal ash content requirement is obtained; on the basis of a conventional roughing and selection two-section technology, the reverse floatation technology is adopted to enable a small amount of high ash content slime in the roughing clean coal to be floated out of pulp through foam, so that consumption of medicament floatation and power is greatly reduced, and the phenomenon that when a large number of solid particles float through foam, mechanical mixing and water flow entrainment of the high ash content slime and clean coal particles happen is effectively avoided; in terms of mineral particle recycling manner, the pollution of the high ash content slime to the clean coal is avoided, the quality of the clean coal is ensured, and high-precision sorting of a large amount of coal slime in the high ash content slime is achieved.

Methods and apparatus are disclosed for the preparation of microscopic samples using light pulses. Material volumes greater than 100 mum3 are removed. The methods include inspecting an object with a scanning electron microscope (SEM) or a focused ion beam (FIB). The inspection includes recording an image of the object. The methods also includes delineating within the object a region to be investigated, and delineating a laser-machining path based on the image of the object so that a sample can be prepared out of the object. The methods further include using laser-machining along the delineated laser-machining path to remove a volume that is to be ablated, and inspecting the object with the scanning electron microscope (SEM) or a focused ion beam (FIB).

The invention provides a glass fiber reinforced PP / PA6 (Polypropylene / Polyamide6) composite material, and a preparation method and an application thereof. The glass fiber reinforced PP / PA6 composite material is prepared by mixing 30-50 parts by mass of polypropylene, 25-35 parts by mass of polycaprolactam, 3-6 parts by mass of compatilizer, 8-15 parts by mass of flexibilizer, 0.5-1.2 parts by mass of lubricant, 0.1-0.3 part by mass of antioxidant, 0.1-0.3 part by mass of coupling agent and 0.2-0.6 part by mass of surfactant, and subsequently preparing with 20-35 parts by mass of glass fiber by using an extruder. The glass fiber reinforced PP / PA6 composite material has ordinary and easily accessible raw materials, the preparation method is simple and easy to operate, and the mechanical property is good; and when the material is applied to a vacuum heat conduction printing technique, the image is clear and vivid, and the effect is good.

The invention discloses a cargo loading and unloading system which comprises a control system, an automatic loading and unloading device and a handling device; the automatic loading and unloading device and the handling device are in signal connection with the control system; and the automatic loading and unloading device and the handling device can be remotely and wirelessly controlled by the control system, so that the requirement on manpower in the loading and unloading process can be reduced, the phenomenon of coexistence of automatic mechanical operation and manual operation on a handlingscene is avoided, and potential safety hazard caused in the cargo loading and unloading process is reduced.

The invention is a multi-user mode channel managing method, setting multiple user modes in a TV set, and concretely comprising the steps of: defining, storing, reading and selecting, where the TV set receives user mode select command and calls out corresponding user chosen channel list from two or more user modes in memory; selecting a channel from the choise list to play. And it customizes the respective channel modes according to viewing choices of different users to make the users able to quickly switch to their loved program channels, adding human-based elements to TV management.

The invention provides a wavelength scanning confocal micro-displacement measurement device and a method. In a confocal microscope optical path system, a wavelength tunable laser is used for carrying out illumination; a Fresnel zone plate is used for carrying out focus point illumination; according to the axial color difference focal shift characteristic, axial scanning of focus light spots is achieved through wavelength scanning; a confocal pinhole photoelectric detection unit is used for detecting confocal axial optical chromatography response output; for the disperse wavelength lambda<n> = lambda<min> + (n-)deltalambda, n = 1, 2, ..., 11, obtaining the axial optical chromatography displacement-intensity response, wherein the lambda<min> is the wavelength lower limit, the wavelength upper limit is lambda<max> = lambda<min> + 10deltalambda, and the deltalambda is the wavelength stepping interval; peak value positions of the optical chromatography response curves form a linear calibration relation searching table of illumination wavelengths and axial displacement; and fine wavelength scanning is executed for each characteristic point of a to-be-measured sample for once, and actual displacement of each point is calculated according to the peak value of each response curve and the searching table. Thus, measurement of micro-displacement or relative height is finished, and the method is suitable for precise measurement of micro displacement, film thickness, nano steps and the like.

The invention relates to a wind generating set control method. The wind generating set control method comprises the following steps: step 1, acquiring an estimated wind regime characteristic value and a wind generator running state initial value via a local or remote communication system; step 2, according to the estimated wind regime characteristic value, the wind generator running state initial value and a wind generating set control parameter, calculating a running state value of a wind generating set at each time point; step 3, comparing the running state values, obtained in step 2, of the wind generating set with a designed safety threshold value of the wind generating set; step 4, adopting an absorption power coefficient reduction and power output improvement method to obtain a corrected wind generating set control parameter; and step 5, using the wind generating set control parameter meeting the designed safety threshold value as a final execution parameter of a wind generator control system. With the adoption of the wind generating set control method, the response speed of the wind generating set is increased, and energy loss and mechanical load brought by shutdown are avoided.

The invention relates to a disk permanent magnet composite brushless motor. The motor comprises a stator (1), a winding (2), a static magnet adjusting ring (3), a magnet gear outer rotor (4), a rotor yoke iron core (5) and a permanent magnet (6), wherein the magnet gear outer rotor (4) is integrated with an enclosure; the permanent magnet (6) is uniformly embedded on the rotor yoke iron core (5) along a circumferential direction; the stator (1) has a disk slotting structure; the winding (2) is embedded in a stator slot; and the static magnet adjusting ring (3) has a disk structure and is arranged between the magnet gear outer rotor (4) and the stator (1). In the motor, an inner rotor is saved on the basis of the conventional magnet gear structure, so processing technology is simplified, permanent magnet materials are saved and larger vibration and noise which are produced by the inner rotor are also eliminated simultaneously.

The invention relates to a waste gas recovery system device of a noise elimination and air cooling static catalytic cracker of an internal-combustion engine, comprising a tail gas recycling device, atail gas recycling nozzle, a tail gas recycling connecting pipe, an engine exhaust system, an exhaust pipe, an air cooling static noise eliminator, an ozone generator, an air cooling static NOX catalyst, an exhaust flow divider, an air cooling NOX catalyst, a semiconductor refrigerator, an axial flow fan, an air cooling particle catcher and an air cooling static mixing catalyst. The waste gas recovery system device is connected with an air supplying system and an oil line system so as to form new external three systems. The invention is suitable for a plane, a steamship, a diesel engine generating set, an internal-combustion locomotive, a motorcycle, a gasoline car, a diesel car, an oil drilling diesel machine, an industrial boiler, a domestic gas cooker, and the like, has simple and convenient installation, i.e. an original system of the internal-combustion engine is taken down and replace with the new system, can save the oil by 15-30 percent without exhaust pollution, prolongs the service life of the internal-combustion engine, is a major energy-saving brainstorm project during the Eleventh Five-Year Plan and is the major breakthrough of the waste gas recovery system--the reformation of the external three-system of an engine in 21 century.

The invention discloses a motor-transmission integrated transmission system for a blade electric vehicle. The motor-transmission integrated transmission system for the blade electric vehicle is a two-gear automatic transmission planet gear mechanism. The mechanism is composed of a single-row 2K-H planet gear mechanism, an electromagnetic clutch, an electromagnetic brake, a differential mechanism, a main speed reduction gear and a permanent magnet synchronous motor. A sun gear is directly and fixedly connected with a rotor base of the permanent magnet synchronous motor through a spline. A stator corresponding to a rotor is fixed to a motor shell. The differential mechanism is arranged in the rotor base of the permanent magnet synchronous motor. Power is transmitted to the sun gear through the motor, transmitted to a left half shaft and a right half shaft of the differential mechanism through a planet carrier, and finally output to wheels through the main speed reduction gear. A gear ring and the planet carrier are combined or separated through the clutch and the gear ring and a box body are fixed or separated through the brake. Through different combinations of the working condition or the non-working condition of the clutch and the working condition or the non-working condition of the brake, the switch between two gears is achieved. The motor-transmission integrated transmission system for the blade electric vehicle is simple in mode, compact in structure, small in size, low in weight and capable of meeting the principle that the vehicle is light in weight.

The invention relates to an improvement method for the coercive force of a neodymium iron boron magnet. The method is characterized by comprising the steps of firstly placing a neodymium iron boron magnet sheet into an argon protection cabin, uniformly spraying dysprosium, terbium or dysprosium-terbium alloy powder on the surface of the neodymium iron boron magnet, and heating rapidly to solidify the powder on the surface of the neodymium iron boron magnet into membranes; then sending the magnet into a vacuum furnace to perform thermal treatment, thus allowing heavy rare earth element to diffuse to the interior of the magnet along a grain boundary; therefore, the coercive force of the magnet is significantly improved. The method has the advantages that a utilization rate of heavy rare earth material is high, a heavy rare earth membrane layer is high in purity, and membrane forming speed is quick, so that the method is beneficial to production in batch, and the coercive force of the magnet is significantly improved after thermal treatment.