272results about How to "Structural innovation" patented technology

The preparation method for the large-standard high-speed resin heavy duty grinding wheel for grinding a steel billet comprises the steps that a dedicated binding agent for a high-performance modified high polymer matrix phenolic resin grinding wheel is prepared by using phenolic resin, xylok resin, butyral resin, iron pyrite, cryolite, light magnesium oxide, barite, 400 # carborundum and calcium carbonate, dedicated formulas for a grinding layer and a core layer are separately designed by using grinding materials such as fused alumina zirconia, aluminium oxide sintered corundum, black silicon carbide, furfural, dibutyl ester, fibers and steel rings, and the large-standard high-speed resin heavy duty grinding wheel for grinding the steel billet is prepared by adopting a dual-phase reinforced composite technology and structure. According to the large-standard high-speed resin heavy duty grinding wheel for grinding the steel billet, the linear velocity is equal or greater than 90 m / s to 120 m / s, the maximum diameter is 925 mm, the thickness is 125 mm, and the tensile and breaking strength and the grinding efficiency of the grinding wheel are greatly improved. When the large-standard high-speed resin heavy duty grinding wheel for grinding the steel billet is under heavy duty, the adaptability of the condition of grinding range is wide, and the linear velocity is high. The grinding efficiency reaches a thickness of 1 cm at a time, the problems that an existing grinding wheel cannot adapt to a steel billet, and the heavy duty grinding of steel is difficult are solved well, and the increasing development requirements of the iron and steel industry are met.

An information sensing and storing device has a dual-MTJ (Magnetic Tunnel Junction) structure, and comprises a bottom electrode, an MTJ 1, a non-ferromagnetic metal isolation layer, an MTJ 2 and a top electrode sequentially from bottom to top, wherein a metal wire is arranged at one side of the device. A fabrication method of the information sensing and storing device comprises the five steps of: 1, depositing a magnetic multi-layer film material on a substrate; 2, performing annealing through an ultrahigh magnetic field vacuum annealing apparatus to fix the magnetization direction of a reference layer; 3, finishing shape fabrication of the dual-MTJ structure by using traditional nanometer device processing technologies such as photoetching, etching and magnetron sputtering; 4, depositing an isolation layer at the outer side of the dual-MTJ structure, and configuring the metal wire near the dual-MTJ structure through the technologies such as photoetching, etching and inlaying; and 5, forming a metal electrode at the top of the dual-MTJ structure by using the processing technologies such as photoetching, etching and inlaying for subsequent integration or test.

An innovative wing structure provides fibs to support skin panels without an attachment between the rib and the stringer free flange or the web. The support is provided by rib shear ties installed directly to the stringer skin flange. The rib incorporates a cut away to allow the stringer to pass through the rib. The composite stringer is an ‘I’ section and is stable under compression, not requiring mechanical methods to prevent rolling over.

The invention discloses a preparation method of a three-dimensional-structure graphene / carbon nanotube hybrid carbon material. The preparation method comprises the following steps: sufficiently dissolving a divalent metal salt, a carbon source precursor and a precipitant in water to obtain a mixed solution; carrying out hydrothermal reaction on the mixed solution to obtain a suspension; sequentially carrying out centrifugation, washing and drying, and taking the dried brown powdery precursor; mixing and grinding the precursor and a cyanamide compound, and carrying out carbonization to obtain the black powder; and finally, carrying out pickling treatment on the black powder to obtain the three-dimensional-structure graphene / carbon nanotube hybrid carbon material. According to the preparation method, the self-template in-situ carbonization catalytic technique is adopted to prepare the three-dimensional-structure graphene / carbon nanotube hybrid carbon material. The carbon nanotubes directly grow out of the graphene surface, and the carbon nanotubes and graphene are connected through sp2 covalent carbon bonds instead of simple physical mixing. The method is simple, is low in cost, and is suitable for large-scale production.

This invention discloses a jacket-layer sliding type friction nanometer generator, comprising a first conducting member, a first friction layer, a second conducting member and a second friction layer, wherein the first friction layer is positioned on the outer surface of the first conducting member in a contact manner and the second friction layer is positioned on the outer surface of the second conducting member in a contact manner. The first friction layer comprises a plurality of first friction units and the second friction layer comprises a plurality of second friction units. The outer surfaces of the first friction units belong to a first curved surface and the inner surfaces of the second friction units belongs to a second curved surfaces. The first curved surface and the second curved surface outside the first curved surface form an inside-outside jacket-layer structure. The outer surfaces of the first friction units produce relative sliding friction with the inner surfaces of the second friction units, the friction area is changed, and electric signals are outputted to the external circuit through the first conducting member and the second conducting member. The friction nanometer generator disclosed by the invention can be used as a new energy technology or a sensor technology.

The invention discloses a novel axial-flow pump for particle image velocimetry, which is mainly used for velocity field measurement of the internal flow of the axial-flow pump. The axial-flow pump comprises a water-guide cone, an impeller blade, an impeller hub, an impeller guide blade, an impeller guide hub, a square organic glass outer barrel, a streamline ribbed plate, a guide vane body flange, a bolt, a shaft, a bending tube section, a bearing, screws, a shaft sleeve, an oil seal, a rolling bearing, a coupler and other parts. The novel axial-flow pump has the beneficial effects of improving the accuracy of particle image velocimetry (PIV) of the axial-flow pump, innovating the structure of the novel axial-flow pump, realizing particle image velocimetry in the real flow field in the axial-flow pump, prolonging the service life of the novel axial-flow pump for particle image velocimetry, leading the flow field of the axial-flow pump used for an experiment to be more similar to that of a real product pump, and ensuring the real flow in an impeller and a guide vane to be observed and measured at the same time.

The invention pertains to double phosphorescent dyes co-doped white organic light-emitting device and discloses the preparation method. The invention adopts sandwich structure and intermingles the two high-efficient phosphorescent dyes together in the wide band gap body; and also takes use of the energy difference between emission layer and its bilateral function layers to form a structure of energy sink type; restricts exaction within the structure completely, thereby realizing composite luminescence. The structure of the device is indium tin oxide (ITO) / metal oxide / hole-transporting layer / electron blocking layer / emission layer composed of the co-doped blue and orange light phosphorescent dyes / electron transporting(hole blocking)layer / metal cathode. The prepared devices are driven by direct voltage and obtain high-efficient white light emission. The maximum electroluminescence current efficiency is 52.8cd / A; the maximum electroluminescence (EL) power efficiency is 42.5lm / W; the maximum luminance is19500 cd / m2. The devices show simultaneous emission of complementary colors of orange and blue and stable spectrum when at work. The device has simple manufacturing process, low cost and excellent stability.

The invention discloses a dual-toroid enveloping worm with cone generatrix numerically controlled grinder, which mainly comprises a machine tool part and a control cabinet part, wherein the machine tool part comprises a machine tool body, a longitudinal planker, a traverse planker, a tailstock and a main shaft, wherein the longitudinal planker is provided with a rotary disk and a rotary guide rail; the rotary disk is provided with a radial feed planker; the radial feed planker is provided with a traverse feed planker; the traverse feed planker is provided with a grinding head part; the grinding head part is provided with a numerically controlled grinding wheel shaper; and the control cabinet part can be used for controlling the main shaft to rotate around the X axis, the rotary disk to rotate around the Y axis, the longitudinal planker to make longitudinal movement along the B1 axis, the radial feed planker to make radial feed along the B axis, the traverse feed planker to make traverse feed along the A axis, the grinding wheel to rotate around the Z axis and a tool rest of the grinding wheel shaper to make horizontal movement and vertical movement along the X1 axis and the Y1 axis, and the axle linkage is realized in the directions of the X1 axis and the Y1 axis and the linkage is realized in the X axis, the Y axis, the B axis and the A axis. Through controlling the movement of the shaped grinding wheel, the tooth surface of the dual-toroid enveloping worm with cone generatrix is enveloped.

The invention relates to an intelligent layered controllable precision deep scarification fertilization device, comprising a frame fixing device, a fertilizer ejecting device, a layered fertilization deep scarification device, a hydraulic driving system and a control system, wherein the fertilizer ejecting device is used for supplying a fertilizer to ensure the growth conditions of crops; the layered fertilization deep scarification device is used for deeply scarifying soil and applying the fertilizer to different soil layers; the hydraulic driving system changes the rotating speed of a fertilizer ejecting shaft of the fertilizer ejecting device by controlling the rotating speed of a hydraulic motor, and then changes the fertilizer ejecting speed; and the control system realizes fertilizer compensation by controlling the rotating speed of a hydraulic motor in the hydraulic driving system. A few of fertilizer ejecting pipes of a fertilization shovel separately reach different soil layers; each fertilizer ejecting branch is provided with an electromagnetic proportional velocity regulating valve, a hydraulic motor and an outer grooved wheel fertilizer ejector, so that layered control can be realized, the fertilization precision is higher, and the controllability is stronger; and the device realizes 'single pipe single control', layered control of the fertilization amount and intelligent precision deep fertilization, thereby improving the utilization rate of the fertilizer, relieving the labor intensity and improving the working efficiency.

The invention discloses an interferometric optical fiber hydrophone resisting strong electromagnetic interference and a manufacturing method thereof. The hydrophone comprises a hydrophone casing. A sensing coil is arranged in the hydrophone casing. One end of an optical fiber which winds around the sensing coil is connected with an external optical fiber through a first coupler. The other end of the optical fiber which winds around the sensing coil is connected with a Faraday rotation mirror through a second coupler. The sensing coil, the first coupler and the second coupler are encapsulated in a structure matrix. The hydrophone casing is made of a non-metallic material. The structure matrix is encapsulated in the hydrophone casing. The Faraday rotator mirror and the external optical fiber are located outside a measured strong electromagnetic environment. Other parts of the hydrophone are located within the measured strong electromagnetic environment. According to the interferometric optical fiber hydrophone resisting strong electromagnetic interference and the manufacturing method thereof, which are provided by the invention, the Faraday rotator mirror is moved outside the measured strong electromagnetic environment; the hydrophone is completely made of the non-metallic material; and the problem of difficult acoustic signal sensing in a high magnetic field and high electric field environment can be solved.

The invention provides a multifunctional laser cutting and welding integrated machine which comprises a laser cutting control system, an automatic sucking disc feeding system and a machine tool body. The machine tool body is provided with a Y-axis mechanism. The Y-axis mechanism is provided with a Z-axis mechanism. The Z-axis mechanism is internally provided with a fiber cutting head and a carbon dioxide cutting head and further internally provided with a lead screw guide rail. The fiber cutting head is connected with the lead screw guide rail in a transmission manner. The carbon dioxide cutting head is fixed to a shell of the Z-axis mechanism. According to the multifunctional laser cutting and welding integrated machine, a CO2 laser and a fiber laser are arranged in the same laser head at the same time and are switched and used through the same power source, the CO2 laser and the fiber laser are controlled in a time-sharing manner, and metals can be cut and welded alternatively or nonmetals can be cut through the same machine tool to meet the requirements of multiple machining manners and machining objects. The multifunctional laser cutting and welding integrated machine is compact in structure, multiple in function and high in performance cost ratio.

The invention discloses a vehicle body hinged device and a rotation angle control method for a self-guided virtual track train. The vehicle body hinged device comprises hinged mounting seats, a spherical metal joint and an angle sensor assembly. The hinged mounting seats are hinged by the spherical metal joint, and the angle sensor assembly is installed on the hinged mounting seats. The angle sensor assembly comprises an angle sensor, a sensor limiting bracket and a sensor positioning bracket. When a vehicle crosses a curve virtual track, the rotation angle of the hinged device is measured bythe angle sensor, and the angle information is fed back to a control system. The control system adjusts the rotation angle of the hinged device by an active shock absorber according to the angle information. According to the vehicle body hinged device and the rotation angle control method for the self-guided virtual track train, the displacement, in the longitudinal, lateral and vertical directions, of a vehicle body is limited, three-way rotation between the two vehicle bodies is allowed, and the function of load transmission is achieved. After the vehicle separation distance is reduced, andthe length of a penetrating channel is shorted, the utilization rate of vehicle space can be improved, and at the same time the turning radius of the vehicle can be smaller.

The invention provides a combustion chamber fuel nozzle device. The combustion chamber fuel nozzle device comprises a nozzle rod part and a fuel nozzle shell; a main combustion level oil line and a pre-combustion level oil line are arranged in the nozzle rod part; one end of the pre-combustion level oil line is connected into the fuel nozzle shell and provided with a pre-combustion level nozzle; one end of the main combustion level oil line is annularly distributed on the periphery of the fuel nozzle shell and provided with a plurality of main combustion level nozzles which are machined independently so that fuel oil in the main combustion level oil line can be ejected rotationally; and the fuel nozzle shell is connected with a main swirler and located at the outlet ends of the main combustion level nozzles and the outlet end of the pre-combustion level nozzle. According to the combustion chamber fuel nozzle device, the main combustion level nozzles are machined independently and then welded to the fuel nozzle shell, the oil injection mode of the main combustion level nozzles is adjusted, thus, the oil injection mode of the main combustion level nozzles is converted from the direct-injection mode into the centrifugal mode, the atomization effect is strengthened, mixing of fuel oil and air in a main combustion zone is facilitated, and finally, pollutant discharge of a combustion chamber is reduced.

A non-power-interrupted lamp string, especially indicates a structure which is able to secure electrical circuit conduction of the lamp string while bulbs are fallen off. Mainly, a fixed plate-terminal and an elastic movable plate-terminal is assembled separately in the interior of each lamp assembly to form an effective clip connection by the elastic contacting of movable plate-terminal to fixed plate-terminal while the lamp is fallen off from the lamp. And, the electrical circuit conduction of the lamp string is secured after the provision of a non-power-interrupted electrical circuit conduction.

A solar cell involving a silicon wafer having a basic doping, a light-receiving front side and a backside, which is provided with an interdigital semiconductor pattern, which interdigital semiconductor pattern has a first pattern of at least one first diffusion zone having a first doping and a second pattern of at least one second diffusion zone, separated from the first diffusion zone(s) and having a second doping that differs from the first doping, wherein each second diffusion zone is arranged along the sides of at least one groove extending from the backside into the silicon wafer.

A paraffin-prevention and viscosity-reduction rectifier of an oil field flowing well is suitable for extracting oil from an oil field high-pressure well, and the long-standing, big and difficult problem that paraffin and scale of a flowing well are scraped and removed through manual work since the beginning of the oil exploitation history is solved. The rectifier is a tubular tool and mounted in the position about one thousand meters under a paraffin-troubled well section of the well. A first-level vortex rectifier body, an impinging stream phase mixing device, a second-level vortex rectifier body, an impact type acoustic oscillator and a third-level vortex rectifier body are mounted in the rectifier from bottom to top, a large-cluster laminar-flow condensed phase state of flowing oil, gas and water can be treated to form a fine-cluster milky eddying turbulence phase state, all heterogeneous components are made to wrap one another, refining, scattering and shielding of paraffin crystals and scale crystals are achieved, the physical state, the physical property, the flow state and the flow speed of produced liquid are optimized, and the phenomenon that the well is blocked by gathered paraffin and scale crystals on the oil tube wall is fundamentally eliminated; and meanwhile, the viscosity of the produced liquid is greatly lowered, the in-well burble procedure is effectively prolonged, manual paraffin and scale scraping and removing are omitted, workover treatment is reduced, oil extraction cost is lowered, and production and efficiency are improved.

The invention provides an integrated single-fiber droplet manipulator. The integrated single-fiber droplet manipulator is characterized in that the device is composed of a section of multi-core optical fiber comprising a cladding and a fiber core, the fiber end is ground to form a cone frustum fiber end, the end face of the cone frustum fiber end is provided with a layer of liquid injection smoothporous surface film doped with a photosensitive material, and the film is provided with an array groove structure filled with a lubricating agent; when light waves transmitted by the fiber core are reflected by the cone frustum fiber end and then gathered to the liquid injection smooth porous surface film on the end face, the light waves are absorbed and converted into heat energy by the photosensitive material, a temperature gradient field is formed in an irradiation area, droplets attached to the liquid injection smooth porous surface film generate wetting gradient force under the influenceof the temperature gradient field, the droplets are affected by force, the posture of the droplets changes to generatesdirectional sliding, and finally, the droplets are controlled under the action of different temperature gradient fields by controlling the power of the light injected into the fiber core. The manipulator can be applied to the fields of hydromechanics, biology, medicine and the like.

The invention relates to a running mechanism for a suspension type bridge inspection trolley, and belongs to the field of running devices of the suspension type bridge inspection trolley. The running mechanism is innovative in structure and concise in mode, a left running wheel and a right running wheel are symmetrically installed on the upper surfaces of the lower edges of the two sides of a running track, and connected with an n-shaped frame hinge pin of a main frame through connecting rods and connecting bases; a driving mechanism is composed of a motor and a manual chain driving mechanism, the motor and the manual chain driving mechanism are correspondingly connected with wheel shafts of the two running wheels respectively, the motor or the manual chain driving mechanism is controlled to achieve driving running of the running wheel on the corresponding side and driven running of the running wheel on the other side, running of the running mechanism which is driven by the motor or the manual chain driving mechanism and carries the main frame along the running track is achieved, when the motor has temporary failures in work, running can be completed through manual driving by pulling a chain, and then the stable and safe running work of the running mechanism can be guaranteed. The running mechanism is simple, safe and reliable in structure, convenient to install, easy to disassemble and replace and convenient to maintain.

The invention discloses a composite thin film solar cell taking a microcrystalline silicon layer as an incident layer and a preparation method thereof, which relate to a special semiconductor device applied to the conversion of luminous energy into electric energy. The composite thin film solar cell consists of a transparent conductive layer, a microcrystalline silicon hole transmission layer, a dye-sensitized nanocrystalline porous film and a conductive substrate, wherein the dye-sensitized nanocrystalline porous film is coated on the conductive substrate, the microcrystalline silicon hole transmission layer is deposited on the dye-sensitized nanocrystalline porous film to form a solid-state dye-sensitized nanocrystalline microcrystalline silicon composite thin film, and the transparent conductive layer is deposited on the microcrystalline silicon hole transmission layer so as to form the composite thin film solar cell taking the microcrystalline silicon layer as the incident layer. A dye-sensitized nanocrystalline material and the microcrystalline silicon composite thin film material are directly prepared on the conductive substrate, so the composite thin film solar cell and the preparation method thereof overcome the shortcomings of dependence of a dye-sensitized solar cell on transparent conductive glass, low preparation rate and high preparation cost of the microcrystalline silicon thin film solar cell, and the low liquid stability of the conventional dye-sensitized solar cell in the prior art.

A corrosion-inhibiting bactericide for the recovered liquid, the oil-water mixture and the injecting back water in oil field contains alkoxy imidazoline quaternary ammonium salt, other imidazoline derivatives, alcohol solution and water. Its advantage is high effect on killing sulfate reducing bacteria and preventing corrosion.

A spraying module includes a spraying element, a first covering element and a second covering element. The spraying element includes a first electrode and a second electrode. The first covering element has two depressions and is disposed on one side of the spraying element, and the first electrode and the second electrode are disposed in the two depressions respectively. The second covering element includes two protrusions and is disposed on the other side of the spraying element, and the two protrusions cover the first electrode and the second electrode respectively. The first covering element and the second covering element are made by compliant material.

The invention discloses a compound traveling wave thermo-acoustic motor with by-pass structure. It includes feedback channel, acoustic capacitance channel, ejector pump, a primary cooler, thermal acoustic regenerator, heater, thermal buffer channel, a supplementary cooler, a resonance straight-path, muffling part. The by-pass structure is arranged between the feedback channel and the thermal acoustic regenerator. The invention provides a by-pass structure used in the compound traveling wave thermal acoustic motor in order to the reduce the acoustic power loss in the traveling wave loop and restrain the direct current in the loop. Thus the performance of the motor can be improved greatly.

The invention provides a high-power wireless charging test mechanism comprising a transmitting coil system, a receiving coil system disposed on an automobile, an independent rotating platform for driving the transmitting coil system to rotate, and a universal table for driving the transmitting coil system to turn over. Therefore, various states of two coils during the actual wireless charging process can be simulated; the automation degree of the testing is increased; and the testing efficiency is improved. And a solution is provided for high-power wireless charging of the electric vehicle.

The invention relates to a metal-clad double-circuit removable high-voltage vacuum contactor switchgear, which belongs to the electrical category and includes a device main body, a removable vacuum contactor, a static contact, a current transformer, a grounding switch, a main busbar, Quick opening mechanism, ground busbar, shutter mechanism, contact box and equipment door panel. It adopts the arrangement of two removable vacuum contactors overlapping up and down to form the overall equipment body. The fixed contact of the contact arm of the removable vacuum contactor on the upper side is connected with the phase line of the main bus through the branch bus; The static contact of the contact arm of the removable vacuum contactor is connected to the current transformer, the current transformer is connected to the grounding switch through the branch busbar, and each compartment is connected through the grounding busbar to achieve a good grounding function. The invention has strong practicability and can be directly assembled with the high-voltage vacuum circuit breaker cabinet without adding any switching device, and the vacuum circuit breaker can also be directly installed, which greatly improves the variability and utilization rate of the product.

The invention relates to a fold-line-shaped and fan-shaped biaxial rotary sewage blocking and sewage cleaning system, which belongs to the field of water conservancy project facilities and comprises a vertical sewage blocking fence, a fold-line-shaped sewage blocking fence, a fan-shaped sewage blocking fence, a fence difference monitoring system a motive power device, a transmission belt, a work bridge, a sewage guide plate and bearings, wherein the fence difference monitoring system consists of an upstream water level sensor and a downstream water level sensor, and the bearings are used for respectively controlling the fold-line-shaped sewage blocking fence and the fan-shaped sewage blocking fence. The upstream water level sensor and the downstream water level sensor arranged in the fence difference monitoring system are respectively connected with a remote computer system through data wires, and the remote computer system is used for automatically or manually controlling the motive power device for monitoring the water level differences in front of the vertical sewage blocking fence and behind the vertical sewage blocking fence. The sewage blocking and sewage cleaning system provided by the invention has the advantages that the sewage collection, the sewage blocking and the sewage cleaning are integrated, the problem of sewage blocking fence blockage caused by sewage blockage at water taking openings in the water conservancy project operation process is solved, the manufacture is simple, the use is convenient and reliable, in addition, the cost is low, economy and applicability are realized, the sewage collection, sewage blocking and sewage cleaning effects are ideal, and the sewage blocking and sewage cleaning system is suitable for being popularized and applied.

The invention relates to a variable-truss high-steel-truss continuous beam with a varying lower chord curve in order to effectively solve the design problems of a long-span bridge with the upper space and the lower space being limited at the same time. The variable-truss high-steel-truss continuous beam is composed of a left main truss, a right main truss, a lateral combination and a bridge floor system. The left main truss and the right main truss are composed of an upper chord, a lower chord and web members distributed between adjacent joints. The upper chord of the left main truss and the right main truss is in a straight line type; and the line type of the lower chord of the left main truss and the right main truss is composed of straight line sections, transition sections and curve sections, and each curve section is a quadratic parabola extending downwards. The bridge floor system is composed of transverse beams and longitudinal beams, the longitudinal beams of the whole bridge are continuous, and transverse beams at the curve sections are stiffened transverse beams composed of the transverse beams, stiffening transverse rods and stiffening inclined rods.

The invention discloses a cutting device for new energy automobile product wire harnesses. The device comprises a cutting workbench, two guiding roller assemblies are symmetrically arranged at the front end and the rear end of the cutting workbench, a wire cutting base is arranged between the two guiding roller assemblies, a U-shaped cover cap is arranged at the upper end of the wire cutting base,the U-shaped cover cap is arranged in an inverted covering mode, the bottoms of the left side and the right side of the U-shaped cover cap are fixed to the edges of the left side and the right side of the cutting workbench, a working opening is formed in the top of the U-shaped cover cap, a blocking mechanism and a conveying mechanism are sequentially arranged on a top plate at one end of the U-shaped cover cap, the conveying mechanism is located between the blocking mechanism and the working opening, and a cutting mechanism is slidably arranged at the upper end of the working opening. According to the device, automatic batch cutting work of the wire harnesses is well achieved, the accuracy and efficiency are well improved, and meanwhile, the labor cost expenditure is reduced, and more profit margins are brought to enterprises.

The invention discloses a catalyst for preparing low-carbon olefin through one-step conversion of synthesis gas and a preparing method and application thereof. The catalyst comprises Fe, Zr or Mn, K and oxides thereof and is prepared in the way that urea serves as the precipitant and is mixed with a solution, then microwave hydrothermal precipitation is conducted, and filtration, washing and absolute ethyl alcohol ultrasonic dispersion are conducted to obtain precipitate A; or ammonium hydroxide serves as the precipitant and is mixed with a solution, then precipitation is conducted, and filtration, washing and absolute ethyl alcohol ultrasonic dispersion are conducted to obtain precipitate B; urea serving as the precipitant and the obtained A are mixed and stirred and then subjected to dynamic hydrothermal precipitation; ammonium hydroxide serving as the precipitant and the obtained B are mixed and stirred and then subjected to dynamic precipitation; the obtained precipitate is separated, filtered, washed and dried to obtain powder; a potassium carbonate solution is prepared to serve as impregnation liquid to impregnate the powder, and drying, grinding, tabletting and pelleting are conducted to obtain the catalyst. Olefin selectivity is effectively improved, and product distribution is improved; furthermore, raw materials are cheap and easy to obtain, and particle size is controllable.