60results about How to "Achieve engineering" patented technology

The invention discloses a water supplement and algae control method for a large-scale shallow lake water bloom agglomeration water area. The method utilizes a water environment simulation technology, a soft enclosure technology and a dynamic monitoring and scheduling technology and comprises building a lake water environment analogy model, constructing soft enclosure engineering to form a desired water area, carrying out on-line monitoring on the desired water area, building a space-time high precision water environment analogy model of the desired water area, constructing a water quality neural network model and building a flow scheduling system of a water supplement river. The method is a systematic and quantitative technical system which utilizes a river flowing into lake to supply water for a large-scale shallow lake water bloom agglomeration water area so that algal density is controlled. The method builds a defined quantification relationship between supplement water amount and quality and water quality response of a desired water area so that quantitative water environment in the water resource scheduling system is realized, and the problem that the existing water diversion-based alga control engineering measures cannot form a quantitative technical solution so that alga control effects are uncertain or unconspicuous is solved.

The invention discloses a model-driven-based intelligent diagnosis method for a secondary equipment state for a transformer substation. On the basis of a primary equipment topology, calculating an operation state of primary equipment; on the basis of an IEC61850 model configuration file, establishing a secondary equipment topology of a transformer substation and analyzing the operating state of the secondary equipment by combing listing information of the secondary equipment; establish an intelligent diagnosis service logic model library through standardized modeling according to an exit ruleof the soft board of the secondary equipment of the transformer substation and carrying out description by using an XML-based logic description language; and acquiring a service logic model by loadingthe intelligent diagnosis model library, completing mapping between a service logic model and a substation monitoring system database, generating an intelligent diagnostic model instance, and then completing the diagnosis of the secondary equipment state based on relevant real-time data of the substation monitoring system database. Therefore, the standardization of the state diagnosis function ofthe secondary equipment of the transformer substation is promoted.

The invention discloses a polypropylene (PP) alloy material with low molding shrinkage. The PP alloy material is prepared from the following raw materials in part by weight: 5-20 parts of SEBS (Styrene-Ethylene-Butylene-Styrene), 5-30 parts of mixture of basic magnesium sulfate whiskers and inorganic filler, 50-90 parts of PP resin and 2-10 parts of compatilizer. The invention further discloses apreparation method for the PP alloy material. Due to the adoption of the PP alloy material with low molding shrinkage provided by the invention, the molding shrinkage of the PP is effectively lowered, and the original performance of the PP is greatly improved.

The invention provides a method for doubling cone haploids. The method comprises the following steps: 1, cutting off the tips of coleoptiles of buds of corn haploids; and 2, soaking embryos of the buds of the corn haploids without the tips of coleoptiles in mixed liquid of colchicines and dimethyl sulfoxide, so as to obtain corn buts with doubled chromosome. The method for doubling cone haploids, which is provided by the invention, can remarkably improve the survival rate and maturing rate of the corn haploids, wherein the survival rate is higher than 70%, which is far higher than the survival rate of a control group which is generally lower than 50%, the maturing rate is higher than 10%, which is far higher than the maturing rate of the control group which is generally about 5%; moreover, the use amount of colchicines is 5-6 times. When applied to a haploid breeding system, the method can effectively promote the reform of the corn breeding technology to realize large-scale and engineering haploid breeding.

The invention discloses a hotspot path analysis method based on density clustering. The method comprises the following steps: representing a target path as a path point set consisting of a plurality of path points; constructing a similarity distance matrix, comparing the similarity between every two path point sets, calculating clusters formed by the path point sets by adopting a density clustering iterative formula on the basis of the similarity distance matrix, a distance threshold and a density threshold MinPts, and finally outputting the path sets of the clusters as target hotspot paths ina many-to-many manner. The method has the advantages that (1) a similarity comparison method for a target path point set is provided; (2) the selection of the density threshold MinPts has certain flexibility and robustness; and (3) the calculation cost is low, and engineering of the implementation method is realized.

The invention provides a single frequency visible laser. The laser comprises a pump device, a self-frequency doubling crystal, a crystal temperature control device and magnetic field devices arranged above, at the sides of or around a crystal, wherein the pump light of the pump device is output towards the input end face of the self-frequency doubling crystal; the pump light enters into the input end face of the self-frequency doubling crystal and is effectively coupled into the crystal and is absorbed; the self-frequency doubling crystal is manufactured into single nonplanar ring cavity shape; the cutting direction of the crystal is as follows: the frequency doubling direction is DA direction, AB direction, BC direction or CD direction; the pump end face and the output end face of the self-frequency doubling crystal are coated with films in order to realize single frequency doubled light output wavelength; the films are highly transmitted by pump light, highly reflect fundamental frequency polarized light and are highly transmitted by frequency doubled light; or the pump end face and the output end face of the self-frequency doubling crystal are coated with films in order to realize simultaneous output of double wavelengths of the fundamental frequency light and the frequency doubled light, and the films are highly transmitted by pump light, reflect part of fundamental frequency polarized light and are highly transmitted by frequency doubled light. The laser has compact structure, high stability and tunable wavelength.

The invention belongs to the technical field of ship electric power, and particularly relates to test verification of a ship electric power comprehensive control testing system. The ship electric power comprehensive control testing system is characterized by comprising the components of an electric power system comprehensive display control platform (1), an electric power system simulating screen (2), an electric power system simulating data source (3), an electric power system simulating machine (4) and electric power system debugging equipment (5). By means of the testing system and the testing method, the designed ship electric power system can be simulated vividly, thereby performing verification testing and joint debugging testing on a system architecture, service flow, man-machine interface and control function which are comprehensively controlled by the ship electric power system and training the craw. Furthermore the ship electric power comprehensive control testing system and the ship electric power comprehensive control testing method effectively, safely and cheaply ensure engineering in ship electric power system comprehensive control.

The invention relates to a high-temperature alloy rib structure laser solid forming method. According to the method, a rib structure three-dimensional model is constructed, three-dimensional process support is designed according to the place of the rib structure; the model is split, and a cladding control program is programmed. When forming is carried out, cladding forming of the process support part is first carried out on a part on which the rib structure is required to be formed; forming process parameters are adjusted; uniform and stable forming of the rib structure part is carried out; and the process support is removed, such that an integral high-temperature alloy rib structure is obtained. With the method provided by the invention, high-temperature alloy structural parts with rib structures such as lugs and bosses can be integrally manufactured. The invention establishes a basis for realizing engineering in the field of rapid manufacturing.

The invention relates to a transmission characteristic simulation method and system for partial discharge ultrahigh-frequency electromagnetic wave signals of a transformer. The method is characterized by comprising the following steps: (1) conducting self-adaptive grid dividing on a transformer model constructed in advance; (2) setting a stimulated partial discharge signal source; (3) setting more than one data collection point in different positions of a transformer; and (4) obtaining respective collection results of all data collection points after a preset period of time for stimulation, and obtaining the ultrahigh-frequency transmission characteristics of local discharge signals in the transformer according to analysis of collection results of the data collection points. The application proves that the research on the transmission characteristics of partial discharge ultrahigh frequency electromagnetic wave signals is effectively and accurately achieved through a simulation mode. The transmission characteristic simulation method and system can be used for researching the transmission characteristics, such as attenuation rules and frequency spectrum distribution rules, of partial discharge ultrahigh frequency electromagnetic wave signals in a transformer.

The invention discloses a front-end automatic scaffold. The scaffold comprises an INIT module, an SEVER module, an MIN module, a private source dependence setting module and an APP scaffold design module based on WEEX. The INIT module uploads a project template, creates a project on the basis of a certain project template, updates an existing project template, creates a project and downloads project dependence. The MIN module performs dependency check according to configuration, performs code grammar check based on eslink, performs front-end interface automatic test, performs code compiling and obfuscation compression, generates a version number according to code content, and fills the generated version number into html. In the front-end automatic scaffold, a project can be more standardized, modularized, modularized and automated, front-end engineering is further achieved, the whole system is more flexible, and therefore traditional front-end developers are liberated, manpower and time investment is reduced, development cost is reduced, and the overall front-end project development efficiency is improved.

The invention relates to the technical field of heat-proof / heat-insulation / bearing materials, and provides a non-ablative heat-proof / heat-insulation / bearing integrated material and a preparation method thereof, the non-ablative heat-proof / heat-insulation / bearing integrated material comprises a variable-density ceramic fiber reinforced skeleton and nano-porous ceramic filled in the variable-density ceramic fiber reinforced skeleton; and the variable-density ceramic fiber reinforced framework sequentially comprises an upper surface layer (1), a middle layer (2) and a lower surface layer (4), and all the layers form an integral structure through needling and sewing of ceramic fiber lines (3). The mass percent of the nano porous ceramic in the non-ablative heat protection / heat insulation / bearing integrated material is 35-65%; the volume density of the upper surface layer and the lower surface layer of the variable-density ceramic fiber reinforced framework is 0.50-1.0 g / cm < 3 >, and the thickness is 0.5-4 mm; and the volume density of the middle layer of the variable-density ceramic fiber reinforced framework is 0.10-0.30 g / cm < 3 >, and the thickness of the middle layer is 5-60 mm.

The invention discloses a pyramid-prism-based precise FDL. The pyramid-prism-based precise FDL comprises fiber collimators, a pyramid prism, a ball screw and a seal casing. Two fiber collimators are mounted at one end of the seal casing, the pyramid prism and the ball screw are disposed inside the seal casing, the chord surface face of the pyramid prism faces to the light output ports of the fiber collimators and coated with an antireflection film, the three conical surface of the pyramid prism are coated with reflection enhancement films, the pyramid prism is fixedly arranged in a lens holder, and the lens holder is connected with the ball screw through a connection block. The pyramid-prism-based precise FDL is reasonable in design, easy to use, high in delay precision, small in insertion loss and simple in structure and can help achieve instrumentation and engineerization.

A preparation method of modified CPVC by graft copolymerization. The invention is characterized in that the modified CPVC material by graft copolymerization makes up and improves the defect that raw material processing property is reduced with the heat resistance of the material, maintains high heat resistance and high strength of CPVC, and has workable characteristic of general PVC materials. The invention can be used to prepare special-purpose CPVC resin of pipelines for transporting corrosive and high-temperature medium.

The invention is applicable to technical fields such as terahertz security inspection, material detection, remote sensing, and medical diagnosis, and provides a radiometer front-end structure and terminal equipment. The structure includes: a metal box body with a groove on the upper side, and the groove A plurality of bosses are arranged inside, and the bosses are used to position the chip; the two-stage low-noise amplifier chip and the detector chip are arranged on the corresponding bosses in turn; the quartz probe is arranged in the groove of the metal box Inside and on the left side of the boss corresponding to the two-stage low-noise amplifier chip, it is used to receive the signal radiated by the object; the video amplifier is set in the groove of the metal box and is located on the boss corresponding to the detector chip The right side of the table; the electrical connection between adjacent devices can significantly reduce the volume of each circuit, has a high degree of integration, can realize automatic assembly, reduce the difficulty of assembly, and can realize engineering and mass production.

The invention is applicable to the technical fields of terahertz security inspection, substance detection, remote sensing, medical diagnosis and the like, and provides a radiometer front end structureand terminal equipment. The structure comprises a metal box body, a two-stage low noise amplifier chip, a detector chip, a quartz probe and a video amplifier, wherein a groove is formed in the upperside of the metal box body, a plurality of bosses are arranged in the groove, and the bosses are used for positioning the chips; the two-stage low noise amplifier chip and the detector chip are sequentially arranged on the corresponding bosses; the quartz probe is arranged in the groove of the metal box body, is located on the left side of the boss corresponding to the two-stage low noise amplifier chip, and is used for receiving signals radiated by objects; and the video amplifier is arranged in the groove of the metal box body and located on the right side of the boss corresponding to the detector chip. The adjacent devices are in electrical connection with each other, so that the volume of each circuit can be significantly reduced, the advantages of high integration level and fully-automatic assembly can be realized, the assembly difficulty can be reduced, and the engineering manufacture and batch production can be achieved.

The invention is applicable to technical fields such as terahertz security inspection, material detection, remote sensing, and medical diagnosis, and provides a radiometer front end and terminal equipment, including: a metal box body, a groove is opened on the upper side, and a plurality of protrusions are arranged in the groove. platform; the two-stage low-noise amplifier chip and the detector chip are sequentially arranged on the corresponding boss; the quartz probe is arranged in the groove of the metal box and is located on the left side of the boss corresponding to the two-stage low-noise amplifier chip; video The amplifier is set in the groove of the metal box and is located on the right side of the corresponding boss of the detector chip; the electrical connection between adjacent devices; the temperature compensation bias circuit is connected to at least one of the two-stage low-noise amplifier chips Chip connection, which can significantly reduce the volume of each circuit, has a high degree of integration, can realize automatic assembly, reduce assembly difficulty, and can realize engineering and mass production.

The invention applies to the technical field of terahertz security check, substance detection, remote sensing and medical diagnosis and provides a radiometer front end and terminal equipment. The radiometer front end comprises a metal box body, wherein a groove is set at an upper side face; a plurality of bosses are set in the groove; a first low noise amplifier chip, a second low noise amplifierchip and a detector chip are set on the corresponding bosses in sequence; a quartz probe is set in the groove of the metal box body and is located at a left side of the boss corresponding to the firstlow noise amplifier chip; a video amplifier is set in the groove of the metal box body and is located at a right side of the boss corresponding to the detector chip; and conductive wires are set between the bosses in the groove of the metal box body, between the quartz probe and the boss corresponding to the first low noise amplifier chip, and between the boss corresponding to the detector chip and the video amplifier; and adjacent devices are electrically connected through utilization of the conductive wires. A size of each circuit can be remarkably reduced.

The invention discloses a nano-scale resolution integrated optical quantum thermometer. The optical quantum thermometer comprises a spectrophotometer and a quantum temperature sensing chamber. Under the excitation of laser with specific wavelength, a CR (Cross Relaxation) position and corresponding magnetic field intensity according to the physical phenomenon that the PL (Photoluminescence) intensity of a SiC crystal changes remarkably when the SiC crystal causes the CR phenomenon. When the temperature changes 1 mK, the magnetic field frequency shift of a number nT can change, so that the CR positions and the magnetic field intensity respectively corresponding to different temperatures are determined; a calibration curve of the CR positions and the temperatures in the magnetic field is constructed; nano-scale spatial resolution is realized through a macro / micro driving positioning platform; the CR position of the SiC crystal is obtained by displaying the PL intensity change by an uppercomputer, and the temperature distribution graph of a sample material to be detected is obtained according to the calibration curve. The nano-scale resolution integrated optical quantum thermometer is based on the spinning and the CR phenomenon of the SiC crystal; the spatial resolution reaches nano-scale; the temperature measurement precision of 10 mK / Hz1 / 2 is realized; the integrated optical quantum thermometer is constructed; engineering application is facilitated.

The invention discloses a soft abrasive particle flow constraint runner device, which comprises a base and a cover plate, wherein the base is provided with a workpiece sinking tank; the top of a processing runner is provided with a sealed sinking tank; a sealing gasket matched with the sealed sinking tank is arranged inside the sealed sinking tank; a constraint module and a clamp for fixing the constraint module are arranged inside the processing runner; abrasive particle fluid impacts a workpiece to be processed through the constraint module, and a through hole is formed on the constraint module; the cover plate is connected with the base through a bolt, and a lug boss is formed at the bottom of the cover plate; a plurality of runner holes which allow abrasive particle-free fluid to flowinto the processing runner are formed on the base, wherein one runner hole is connected with a pipeline interface which allows fluid in the processing runner to flow out so as to form a drainage port, and the rest runner holes are connected with a one-way valve which prevents the fluid which is being processed from returning; and an abrasive particle flow inlet which allows fluid mixed with abrasive particles to enter the processing runner is formed on the cover plate, and the abrasive particle flow inlet is connected with the one-way valve. The device has the advantages of having good processing effect and high processing efficiency and avoiding non-uniform processing effect.

The invention provides a debugging method based on a full-automatic battery-changing robot. The debugging method includes: debugging the function of the vision system of the battery-changing robot and the communication function of a PLC (programmable logic controller), calibrating the coordinates of a battery case group, and calibrating the taking and placing coordinates of car battery packs. The method has the advantages that a debugging control center is matched with a PLC control system and a vision system, full-automatic debugging of the battery-changing robot is achieved, and the problems that manual debugging is large in error, time consuming, labor consuming, non-uniform in result output, and the like are solved; functional debugging of each component of the battery-changing robot, coordinate calibration and debugging verification can be performed sequentially by the method after the battery-changing robot is mounted, and the robot can be operated after debugging; by the method which is reliable, practical and convenient to popularize, manual debugging error is reduced, and debugging efficiency and data calibration precision are increased.

The invention discloses a polypropylene (PP) alloy material with low molding shrinkage. The PP alloy material is prepared from the following raw materials in part by weight: 5-20 parts of SEBS (Styrene-Ethylene-Butylene-Styrene), 5-30 parts of mixture of basic magnesium sulfate whiskers and inorganic filler, 50-90 parts of PP resin and 2-10 parts of compatilizer. The invention further discloses a preparation method for the PP alloy material. Due to the adoption of the PP alloy material with low molding shrinkage provided by the invention, the molding shrinkage of the PP is effectively lowered, and the original performance of the PP is greatly improved.

The invention discloses a water supplement and algae control method for a large-scale shallow lake water bloom agglomeration water area. The method utilizes a water environment simulation technology, a soft enclosure technology and a dynamic monitoring and scheduling technology and comprises building a lake water environment analogy model, constructing soft enclosure engineering to form a desired water area, carrying out on-line monitoring on the desired water area, building a space-time high precision water environment analogy model of the desired water area, constructing a water quality neural network model and building a flow scheduling system of a water supplement river. The method is a systematic and quantitative technical system which utilizes a river flowing into lake to supply water for a large-scale shallow lake water bloom agglomeration water area so that algal density is controlled. The method builds a defined quantification relationship between supplement water amount and quality and water quality response of a desired water area so that quantitative water environment in the water resource scheduling system is realized, and the problem that the existing water diversion-based alga control engineering measures cannot form a quantitative technical solution so that alga control effects are uncertain or unconspicuous is solved.

The invention relates to the field of image information processing and particularly relates to an image engineering intelligent interpretation method. The method comprises steps of obtaining multi-source image data according to a preset data input standard; extracting image information of the obtained multi-source image data according to a preset image information extraction standard; automatically screening expert interpretation knowledge which meets preset conditions through automatically-allocated task processing nodes based on the extracted image information, and determining the most suitable expert interpretation knowledge; interpreting the determined most suitable expert interpretation knowledge, to obtain image interpretation achievement data which accords with a preset rule set; and performing statistical analysis of the image interpretation achievement data, and outputting the achievement data according to a preset achievement output standard. The invention solves problems that the traditional labor visual interpretation has low efficiency, and the common intelligent interpretation is low in precision and non-standard in result, and achieves standardization and engineering of image interpretation.

The invention relates to the technical field of nuclear reactor engineering, and provides a driving shaft and a control rod water pressure driving system. The driving shaft comprises an outer shaft, ashaft core and a connecting device, the outer shaft comprises a clamping groove section, the shaft core is arranged in the outer shaft, and the shaft core is suitable for moving in the axial direction of the outer shaft; the connecting device comprises a connecting piece connected to the lower end of the outer shaft and a moving piece connected to the lower end of the shaft core, a plurality of clamping pieces are connected to the connecting piece, and the shaft core drives the moving piece to move along the outer shaft so as to drive the multiple clamping pieces to be switched between a mutually-tightened clamping position and a mutually-away opening position. According to the driving shaft and the control rod water pressure driving system, the outer shaft, the shaft core and the connecting device are arranged, the connecting device can be driven to act through movement of the shaft core, the connecting device and a control rod can be disassembled and assembled, the requirements forlong-distance butt joint and long-distance disassembly and assembly of the control rod and the driving shaft in the reactor refueling state are met, and technical support is provided for refueling operation of a reactor.

The invention provides a tunable integrated photo-production microwave source chip and system based on a lithium niobate film. The chip comprises a substrate wafer, a lower cladding, the lithium niobate film and an upper cladding which are sequentially stacked from bottom to top; a lithium niobate optical waveguide is arranged on the lithium niobate film; the lithium niobate optical waveguide comprises a spot-size conversion waveguide, a first straight waveguide, a first bent waveguide, a second straight waveguide, a second bent waveguide, a third straight waveguide and an optical microcavity waveguide which are connected in sequence; a first metal electrode is arranged on the upper cladding at a position corresponding to the first straight waveguide; the first metal electrode, the spot-size conversion waveguide and the first straight waveguide jointly form a phase modulator; a second metal electrode is arranged at a position, corresponding to the optical microcavity waveguide, on the upper cladding; the second metal electrode, the third straight waveguide and the optical microcavity waveguide jointly form a high-Q microresonator; and the lithium niobate film is also provided with a detector connected with the output end of the high-Q micro-resonator. According to the invention, miniaturization and engineering of the photo-generated microwave source can be realized.

The invention discloses an intelligent landscaping and desert ecological restoration device, which comprises a database, a switchboard server, a mobile switch, a protective cylinder seedling raising center, a data collection device and a planting management device, wherein input and output ends of the database are in matched communication connection with input and output ends of the switchboard server; the input and output ends of the switchboard server are in matched communication connection with input and output ends of the mobile switch; the input and output ends of the mobile switch are inmatched communication connection with input and output ends of the protective cylinder seedling raising center; and the input and output ends of the mobile switch are in matched communication connection with input and output ends of the data collection device, and the input and output ends of the mobile switch are in matched communication connection with input and output ends of the planting management device. According to the intelligent landscaping and desert ecological restoration method, the modernized and intelligent landscaping and desert ecological restoration device is constructed byresearching and developing an overall topological structure based on the intelligent landscaping and desert ecological restoration device.

The invention discloses a design method and device of an acceleration type engineering steepest controller, equipment and a medium, and the method comprises the steps: obtaining the process output of a transfer function in unit step input based on the transfer function of an acceleration type steepest tracking filter; according to the output characteristics of process output, generating an approximate acceleration steepest tracking filter by using a cascade pure lag link approximation method; a first-order inertial filter is adopted to replace a pure lag link in the approximate acceleration type steepest tracking filter, and an acceleration type engineering steepest tracking filter is generated; constructing an acceleration type engineering steepest integrator by using an acceleration type engineering steepest tracking filter; and constructing an acceleration type engineering steepest controller by using an acceleration type engineering steepest integrator. The first-order inertial filter is adopted to replace a pure lag link in an approximate acceleration type steepest tracking filter, engineering of the acceleration type steepest tracking filter is achieved, the finally obtained acceleration type engineering steepest controller is free of accumulative errors, and the control precision is higher.

The invention discloses an artillery microwave ignition device, and belongs to the technical field of artillery ignition. According to the artillery microwave ignition device, a coaxial resonant cavity is adopted as a microwave ignition cavity, the coaxial resonant cavity is filled with the gunpowder medium, through holes are evenly distributed in the outer conductor of the coaxial resonant cavity and used for enabling flames after gunpowder ignition to be evenly sprayed out from the through holes, and the purpose that propellant powder is ignited at multiple points at the same time is achieved. The structure is simple, the structure of an ignition emission part of a conventional artillery is slightly changed, and the structure can be conveniently applied to an artillery system. Compared with the prior art, the artillery microwave ignition device can be conveniently and rapidly assembled and debugged, the test efficiency is greatly improved, the trajectory performance of an artillery is effectively improved, and engineering and modularization of artillery microwave ignition are achieved.

The present invention discloses a hotspot path analysis method based on density clustering. Aiming at characterizing a target path as a set of path points composed of several path points, a similarity distance matrix is ​​constructed, and the similarity between two sets of path points is compared. Based on the similarity distance matrix, the distance threshold ε and the density threshold MinPts, density clustering is used to iteratively calculate the clusters composed of path point sets, and finally the path set mode of each cluster is output as the target hotspot path. Advantages of the present invention: (1) propose a similarity comparison method for target path point sets; (2) the selection of the density threshold MinPts has certain flexibility and robustness; (3) the calculation cost is low, and the realization method is engineering .

The invention discloses a low-alloy high-strength hot-rolled steel strip suitable for the extremely cold area and a preparation method thereof. The low-alloy high-strength hot-rolled steel strip is prepared from the chemical compositions in percentage by weight: 0.06-0.10% of C, 0.6-0.7% of Si, 1.40-1.70% of Mn, 0.015-0.025% of Nb, 0.005-0.010% of Ti, 0.004-0.007% of Mg, less than or equal to 0.010% of P, less than or equal to 0.010% of S, less than or equal to 0.002% of Al, 0.002-0.005% of N, and the balance of Fe and unavoidable inclusions. The preparation method includes the following stepsof removal of S from molten iron through a KR method, removal of P and C through a duplex converter, an LF refining furnace, slab continuous casting, reheating of billets in a heating furnace, roughing and finish rolling, ultra-fast cooling, laminar cooling and coiling. According to the low-alloy high-strength hot-rolled steel strip suitable for the extremely cold area and the preparation methodthereof, the problem of the phenomenon of the uneven structure of rolled materials in the ultra-fast cooling process is solved.