30results about How to "Reliable means" patented technology

The invention relates to a social insurance identity authentication method based on face recognition and living body detection, which comprises implementation steps as follows: a face template base database is established and a social insurance user logs on to an identity authentication module which completes the combination of face recognition and living body detection,, a face template online update module, an audit query module, a complaint processing module and a multiple auditing module. The authentication method runs in the following way that: a user logins to generate a face template of the user, the identity authentication module which combines face recognition and living body detection is used to perform identity authentication of face video streams of the user displayed in a front-end video device; if authentication succeeds, auditing is performed while updating the template, and social insurance fund is issued; if authentication fails, a complaint program is used for multiple auditing, and if auditing by all staff passes, the social insurance can be issued. The method can improve the service quality and working efficiency of social insurance processing and can effectively restrain the loss of the social insurance fund.

The invention provides a digitized wheat lodging-resistant experiment wind tunnel. The wind tunnel comprises four units of a wind tunnel body unit, a wind speed control unit, a wind speed determination unit, and an image automatic acquisition unit. The structural characteristics are that the wind tunnel body is integrally installed on a steel frame welded by rectangular steel tubes, an upper wall and side walls are formed by bending color plates which are filled with foam materials inside, two ends of the tunnel body and a front part and a rear part of a contraction section are provided with n-shaped steel frames, a lower layer of a baseplate is a wood board, and an upper layer is a galvanized iron sheet. Axial flow fans are installed on a frame which is welded by angle iron through screws, the fans being divided into three layers and each layer being provided with four fans. Width ratio of the tunnel bodies between an expansion section and the contraction section is 1 to 0.54. A rectification section is installed with barriers made of wood boards. An experiment section is 2.0 m by height, 1.3 m by width, and 7.0 m by length, and the top is installed with fluorescent lamps, and toughened glass observation windows are disposed on central positions of the side walls. Wind speed of the wind tunnel is 0-16 m / s, and is continuously adjustable, and the wind tunnel simulates wind gust velocity through adjusting time of acceleration and deceleration of the fans, so the wind tunnel can satisfy study of wheat wind dynamics and lodging-resistant wind speed research.

The present invention discloses a numerically-controlled machine tool thermal error on-line compensation method and system. The numerically-controlled machine tool thermal error on-line compensation method comprises the steps of: acquiring key measuring point temperature data of a numerically-controlled machine tool; calculating a theoretical thermal error value of the numerically-controlled machine tool according to a multiple linear regression thermal error model; calculating a compensation value and judging whether the compensation value meets a set upper-lower limit range of a compensation threshold value. According to the numerically-controlled machine tool thermal error on-line compensation method, the multiple linear regression thermal error model is built and is used as a thermal error on-line compensation subunit of the numerically-controlled machine tool to be embedded into a human-computer interaction interface of a panel control unit, and an external compensator is not needed, thereby greatly improving universality of the system; at the same time, a fuzzy clustering analysis method and a multiple linear regression theory are used to calculate the compensation value of the numerically-controlled machine tool, and an external coordinate transformation mode is adopted for performing on-line compensation, thus convenient operation and good real-time performance are achieved.

The invention discloses a method for extracting microalgae lipid through biological enzyme catalysis wall breaking. The method includes the steps that A, a phosphate buffer solution and a biological enzyme catalyst are sequentially added into wet algae mud, or algae slurry, or dry powder or fermentation liquor for culturing harvested lipid-generating microalgae, and the mixture is stirred and heated; B, after the enzyme catalysis degradation reaction is finished, the pH value of a reaction system is adjusted, and the temperature of enzyme catalysis degradation liquid is raised and kept; C, after the reaction is finished, the temperature of the enzyme catalysis degradation system is lowered, an extraction agent is added into the reaction system for lipid extraction, and then demulsifier is added to carry out layering through centrifugation; D, reduced pressure distillation or thin film evaporation concentration is carried out on the oil phase obtained through separation to obtain the microalgae lipid. The method is easy to implement and convenient to operate; due to efficient wall-breaking lipid extraction for the lipid-generating microalgae particularly photoautotroph lipid-generating microalgae, energy input in the microalgae lipid extraction process is reduced, the energy efficiency ratio of microalgae energy is increased, and then comprehensive production cost of microalgae biomass energy is greatly reduced.

The invention relates to an apparatus using mechanical stress to test solid material strength characteristic, a cement base material dead loading compound corrosion test instrument. The inventive cement base material dead loading compound corrosion test instrument includes a motherboard and a clamp plate equipped above the motherboard, wherein, support upright posts are connected between the motherboard and the clamp plate, one end of the support upright post is fixed on the motherboard, the other end is equipped with screw thread and penetrates the clamp plate; each support upright post is equipped with two nuts copulated to the screw thread, the two nuts are respectively located on the top and bottom sides of the clamp plate; the middle part below the clamp plate is mounted with a spring, the lower end of the spring is fixed with a clamp plate, test pieces are clamped between the clamp plate and the motherboard. The apparatus has simple structure, convenient operations, easy load exerting and control; can maintain the test piece model at a stable load level for a long term, thereby providing dependable experimental device and approach for investigating material durability problem under compound action of load and corrosion surroundings.

The invention relates to an operating environment safety monitoring and early warning system of meteorological equipment, comprising one or a plurality of multi-element acquisition modules, a concentrator, and a monitoring and early warning terminal system, wherein the multi-element acquisition module is composed of an equipment networking server and a collector; the equipment networking server is connected with one or more of a hydrogen gas detector, a differential mercury vapor meter, a gauss meter or a dust measurement instrument; and the collector is connected with one or more of a temperature sensor, a humidity sensor, a voltage sensor or a smoke sensor. The use of the system in the invention can change the manual monitoring mode in the prior art, the monitoring mode is changed from passive to active, from dispersed to successive, and from post hoc analysis to real-time monitoring. A convenient and reliable means for the equipment guarantee and safety management of meteorological guarantee service departments at all levels can be provided, the management efficiency is improved, and the informatization level of equipment guarantee and management is improved. The system can be used as an auxiliary means and a platform of daily equipment guarantee and shift.

The invention discloses a distributed optical fiber-based blast furnace hot blast stove temperature monitoring system and method and belongs to the technical field of hot blast stove temperature detection. According to the distributed optical fiber-based blast furnace hot blast stove temperature monitoring system and method, a distributed optical fiber transversely winds the top part of a hot blast stove, both the starting end and end of the distributed optical fiber are connected with a distributed optical fiber sensor, the distributed optical fiber sensor is connected with an ARM processor, the distributed optical fiber sensor receives back scattering signals generated by the optical fiber, a novel temperature signal demodulation method is used, the temperature value of each measuring point on the optical fiber is extracted through a double-end single-way demodulation method, and the temperature value of each measuring point is sent to the ARM processor; the ARM processor is connected with an upper computer through an industrial Ethernet interface. According to the distributed optical fiber-based blast furnace hot blast stove temperature monitoring system and method, the surface temperature of the hot blast stove is performed with multi-point measurement through the distributed optical fiber, because the optical fiber directly and firmly contacts with a hot blast stove shell, the temperature measurement result is capable of reflecting the real temperature of the hot blast stove body; the distributed optical fiber-based blast furnace hot blast stove temperature monitoring system and method are convenient for early forecasting the stove shell damage situation and good for improving the service life of the hot blast stove, lowering the coke ratio and improving the blast furnace production rate.

The invention discloses a mould for building a spherical or cylindrical cellar and a method for building the cellar by the adoption of the mould. The mould comprises an air bag and an inflation and deflation device fixed on the air bag, wherein the air bag (1) is designed to be spherical or cylindrical and is made of one layer of soft material, a bag cap (1.4) is connected with the top end of the air bag (1), and the inflation and deflation device (2) is arranged on the bag cap (1.4) and is composed of an inflation and deflation pipe (3), an intercalated disc (4) fixed to the lower section of the inflation and deflation pipe (3) and a valve (5) arranged on the inflation and deflation pipe (3). The mould is simple in structure, low in production cost and stable and reliable in construction, and the construction method is simple, easy to operate, and high in construction efficiency.

The invention discloses a method for controlling cooling water flow of double-roll strip casting rolls. Each casting roll is provided with one or more water inlets and corresponding water outlets. Correspondingly, one or more independent cooling water channels are formed in each casting roll. A water outlet of each cooling water channel is provided with a flow adjusting valve which can adjust the flow of cooling water passing through the cooling water channel. A water pump which can adjust the flow is used for providing cooling water for the two casting rolls. Meanwhile, a flow controller monitors the flow qn of cooling water in each cooling water channel of each casting roll and adjusts the corresponding flow adjusting valve to change the flow of cooling water in the corresponding cooling water channel according to the deviation of the flow qn and the cooling water flow average value in the cooling water channels, finally, the flow in all the cooling water channels in each casting roll is consistent, and therefore the cooling strength in the casting rolls can be even. The method has the beneficial effects that the cooling water flow control precision is high, and the responding speed is high.

The invention discloses a surface plasma coupled emission (SPCE) directional enhanced microscopic fluorescence imaging and spectrum detection method and device based on an objective lens coupling type. Polarized exciting light modulated by a half-wave plate is reflected by a dichroic filter and then reaches an objective lens at a specific angle to excite metal surface plasma to be coupled to a sample, and generated SPCE signals are collected by the objective lens and filtered by the dichroic filter and then are switched and guided into an SPCE microscopy fluorescence imaging module or an SPCE microscopy fluorescence spectrum module through a reflector to realize SPCE microscopic fluorescence imaging and spectrum acquisition of the same micro-area of the sample. By combining a microscope system, a coupling strategy SPCE is applied to high-spatial-resolution fluorescence imaging and spectrum at the same time, the directional enhancement characteristic and the spatial selection function on the micro-area scale are achieved, high-quality microscopic fluorescence imaging and spectrum information of the same micro-area of a sample can be obtained, and an efficient and reliable means is provided for detecting the low-content components of a micro area of interest in a complex system.

A plant cultivation device provided by the invention comprises at least one container body, wherein a long-bar baseplate is disposed on each container body, plural separation plates arranged at an equal interval are disposed on the baseplate, plural grid positions are separated on the baseplate, a back plate connected among each separation plate is disposed on one side of the baseplate, and plural windows which are respectively communicated with each grid position are disposed on the back plate; and plural first through holes which are respectively communicated with each grid position are disposed in the baseplate. In this way, each grid position of the container body can be used as growth space for plant storage, and the first through holes in the baseplate are taken as a contact channel between plant root parts and a culture liquid under the container body; and especially, the growth space of each plant can obtain good air ventilation effect under window effect of the container body, plant rot caused by excessive moist of the growth space can be avoided by a relatively more positive and reliable manner, and thus plant growth quality can be increased.

The invention discloses a complicated jointed rock mass hydraulic coupling field tri-axial testing system. The complicated jointed rock mass hydraulic coupling field tri-axial testing system comprises a water-tight test cabin, a tri-axial stress loading system, a water pressure loading system, a drainage system and a measurement system, wherein the tri-axial stress loading system comprises a water-permeable steel plate, a force transfer steel plate, a jack, a hydraulic pipeline and a pressure controller, wherein the water pressure loading system comprises a high-pressure water pump and a pressure water pipeline, the drainage system comprises a water-permeable base and a drainage pipeline, and the measurement system comprises an osmometer, a flow meter, a strain meter, a sound wave transducer, a data line and a computer. The complicated jointed rock mass hydraulic coupling field tri-axial testing system can provide an effective and reliable research means for research of an engineering rock mass hydraulic coupling mechanism.

The invention discloses a U-shaped gate valve, and relates to the field of valves. The U-shaped gate valve comprises a valve body, a valve rod, a valve plate and a valve seat, wherein the valve body and the valve seat jointly clamp the valve plate, the valve plate is U-shaped, an elastic part to provide the thrust required for sealing and matching of the valve plate and the valve seat is arrangedbetween the valve plate and the valve body, the elastic part comprises a plurality of first elastic parts arranged on the valve body in a U-shaped arrangement, the first elastic parts are tubular andare provided with notches in the length direction, and the valve body and the valve seat adopt a movable adjustable connection. The U-shaped gate valve has the advantage of good working stability.

The invention belongs to a monitoring processor used to extract a useful signal from high noise by being matched with a wireless router and so on in the remote monitoring and processing technique of a wireless network and a processing method thereof. The processor comprises a CPU, a communication module, a program read-write port module, a parallel communication module, an analog-digital conversion module, a constant current source module, a voltage transformation circuit, a signal filter and high voltage protection circuit, a signal amplifying module, a current signal adjusting circuit, a memory and a keyboard input circuit; and the method comprises: after the communication module receives a signal, firstly the threshold filtration of noise is performed, and the wavelet transformation processing of the signal is performed in the wavelet field through the CPU so as to reduce or completely eliminate the noise. Therefore, the processor and the method have the characteristics that the processor and the method can effectively extract the useful signal from a great amount of disorder noise signals, and automatically send the useful signal to a device such as a platform terminal and the like, and the point-to-point and one-to-many communications are realized; and the invention also provides a convenient and reliable method for mobile office work by utilizing the prior GSM network.

The invention provides a DNA metabarcoding detection target sequence, a detection kit and a detection method for screening animal provenance components in meat products. The DNA metabarcoding detection target sequence is a fragment on a mitochondrial 16SrRNA gene, the length of the fragment in 23 target species is 368-384 bp, and the kit comprises a pair of universal primers and a reaction reagent. When the detection kit is used for screening animal provenance components in the meat products, the method comprises the following steps: carrying out PCR amplification on genome DNA of a detected sample by adopting the universal primer, and recovering and purifying the amplification product; carrying out next-generation sequencing on the purified amplification product; and performing comparison or bioinformatics analysis to determine the provenance components of the detected sample. A reliable means is provided for non-directional screening of 23 species (including 14 edible animals and 9 non-edible animals) in the meat products, and the detection method has the advantages of being non-directional, high in throughput, high in sensitivity and the like.

The invention discloses a metformin hydrochloride slow release tablet which is prepared from the following materials according to the weight proportion: 68% of metformin hydrochloride, 18-22% of a slow release material and the residual amount of a pharmaceutic adjuvant, wherein, the slow release material takes the compound of hydroxypropyl methylcellulose K100 and glyceryl behenate, and the weight ratio of the hydroxypropyl methylcellulose K100 and the glyceryl behenate is 1:0.1-0.5. The metformin hydrochloride slow release tablet has the advantages of small in vitro release difference among tablets and batches, good curative effect, long drug action, little side effect, few administration frequency, convenient use and the like, and has unique advantages of treating and relieving type II diabetes symptoms, preventing sudden onset of diseases, protecting the daily life of patients and bringing the patients through the onset peaks; and the slow release provides reliable measures and great convenience for the treatment of the patients and self prevention of the sudden onset of diseases.

The invention relates to an extended release nifedipine agent with sodium alginate as release materials and the components with the weight percentages: nifedipine 10 percent, sodium alginate 30 to 50 percent and the allowance of other medical supplemental materials. By adopting the sodium alginate as the only release materials, the invention has the advantages of strong controllability, stable storage, good efficacy, long control effect and less taking times for patients. As the sodium alginate is natural polysaccharide carbohydrate extracted from kelp, a natural cellulose, the invention not only reduces the side effect of the drugs but also alleviates the absorption of fatty acid and bile salt, thus having the effect of reducing the serum cholesterol, blood triglyceride and blood glucose; at the same time, the invention can prevent the accumulation of harmful metals such as strontium, cadmium and lead in intestinal of bodies and has the advantages of preventing diseases such as hypertension, diabetes mellitus and obesity, preventing sudden pathogenesis and safely spending pathogenesis peak periods.

The invention discloses an online compensation method and system for thermal error of a numerical control machine tool; collecting temperature data of key measuring points of the numerical control machine tool, calculating the theoretical thermal error value of the numerical control machine tool according to a multiple linear regression thermal error model, calculating the compensation value and judging whether the set value is satisfied Compensation threshold upper and lower limit range. The present invention builds a multivariate linear regression thermal error model, and embeds it as a thermal error online compensation subunit of a CNC machine tool into the human-computer interaction interface of the panel control unit, without requiring an external compensator, which greatly improves the versatility of the system; At the same time, the compensation value of CNC machine tools is calculated by using fuzzy cluster analysis method and multiple linear regression theory, and the external coordinate transformation method is used to perform online compensation, which is convenient and real-time.

The invention provides a phased array ultrasonic evaluation method of crystal grain size, the method includes: using the primary bottom echo and the secondary bottom echo to obtain the experimental longitudinal wave scattering attenuation coefficient; deriving the linear phased array from the Huygens principle The probe radiates the sound field, receives the average sound pressure through the probe, defines the diffraction correction coefficient of the linear phased array probe and calculates the final diffraction correction coefficient; according to the Weaver ultrasonic scattering model, the theoretical relationship between the grain size and the longitudinal wave scattering attenuation coefficient is obtained, based on the nonlinear minimum The square method uses polynomial fitting to obtain the proxy model of the grain size and the theoretical longitudinal wave scattering attenuation coefficient; the experimental longitudinal wave scattering attenuation after removing the diffraction loss is substituted into the proxy model to invert the grain size value. The invention eliminates diffraction loss interference, fuses multi-angle sound beam information, and greatly reduces relative error compared with traditional methods, and provides a feasible and reliable means for estimating the grain size of polycrystalline materials.

The invention discloses a power data asset operation management and control data production link generation method and device, and the method comprises the steps: building a link relation through sequentially querying a ledger table, a blood relationship table, a metadata table and a task table related to a power data asset operation management and control system; distinguishing a link type through a preset field, and reversely generating a link; and analyzing the node position of the generated link, storing corresponding data, and drawing a node generated link diagram. According to data assets in a current electric power data asset operation management and control system, a data link automatic generation process of the data assets from a source business system to a data center and then to an application is established by combining data warehouse characteristics and a big data technology, so as to support link state and process monitoring; complex and multi-class job scheduling tasks in links of data acquisition, data transmission, data processing and data supply are acquired and fused, and a more flexible, more comprehensive and more reliable monitoring tool and means are provided for data management personnel.

The invention discloses a sewage treatment process analysis method based on a directed acyclic graph. The method comprises the following steps: reading real-time data of each online instrument; calculating a process index (V) in combination with the existing parameters; according to the sequence of the process indexes (V) in a process chain and an index reaction mechanism, establishing a directedrelationship (E) between the indexes, exhaustion of the indexes in a limited number of indexes, and marking the relationship by using characters; establishing a set (E') by taking characteristic values in a graph as all nodes as objects; establishing a directed acyclic graph subset (G') of the directed acyclic graph G by taking nodes in the set as objects; and performing path search among the nodes E' in the connected state in the graph G', and taking the maximum path to establish a set R. According to the method, index association can be rapidly constructed, directed acyclic graph paths can be easily modified along with simple increase and decrease of the nodes, and corresponding reasoning paths can be automatically generated.

The invention discloses a modeling method for lining erosion of blast furnace hot blast stoves based on distributed optical fibers, and belongs to the technical field of modeling erosion of hot blast stove linings. In the present invention, the distributed optical fiber is horizontally wound on the top of the hot blast stove, and the start and end of the distributed optical fiber are connected to the distributed optical fiber sensor. The distributed optical fiber sensor adopts a double-end single-path demodulation method to extract the temperature field along the optical fiber path. The erosion model solving unit uses the finite element method to solve the actual shape and size of the inner boundary of the hot blast stove body; in the process of solving, the virtual adiabatic inner and outer boundary correction method is used to deal with the boundary problem of the hot blast stove lining erosion model and quantitatively calculate the hot blast stove lining Erosion status: The virtual adiabatic internal and external boundary correction method makes the erosion model not only suitable for the hot blast stove at the beginning of the furnace, but also for the hot blast stove that has been put into production, and can even be extended to the relevant monitoring fields of the hearth bottom of the blast furnace, which greatly improves The scope of application of the erosion model is widened, which provides a guarantee for the safe production of blast furnaces.

The invention belongs to a monitoring processor used to extract a useful signal from high noise by being matched with a wireless router and so on in the remote monitoring and processing technique of a wireless network and a processing method thereof. The processor comprises a CPU, a communication module, a program read-write port module, a parallel communication module, an analog-digital conversion module, a constant current source module, a voltage transformation circuit, a signal filter and high voltage protection circuit, a signal amplifying module, a current signal adjusting circuit, a memory and a keyboard input circuit; and the method comprises: after the communication module receives a signal, firstly the threshold filtration of noise is performed, and the wavelet transformation processing of the signal is performed in the wavelet field through the CPU so as to reduce or completely eliminate the noise. Therefore, the processor and the method have the characteristics that the processor and the method can effectively extract the useful signal from a great amount of disorder noise signals, and automatically send the useful signal to a device such as a platform terminal and the like, and the point-to-point and one-to-many communications are realized; and the invention also provides a convenient and reliable method for mobile office work by utilizing the prior GSM network.

The invention provides a detection apparatus and a detection method of a surface cleaning effect of a cold-rolled sheet. The detection apparatus is composed of a handle, a spring, a working arm, a pin shaft, a contact pad and a position-limiting bolt. The working arm is connected to the front end of the handle through the pin shaft. The spring is arranged between the handle and the working arm. The contact pad is fixed at the front end of the working arm. The lower part of the contact pad is connected to a sponge through a screw rod, wherein the sponge is wrapped by a test pad. The middle of the handle is connected to the position-limiting bolt through threaded connection. The detection method comprises the following steps: (1) pressing the contact pad placed on the surface of the cold-rolled sheet with the handle, comprising the spring until the back part of the working arm is pressed against the position-limiting bolt, enabling the test pad to be rubbed on the surface of the to-be-tested cold-rolled sheet for 3-10 s and moving away the test pad; and (2) comparing the test pad with a reference card, and determining the alkaline cleaning degree on the surface of the cold-rolled sheet according to the color of the test pad and the residual amount on the test pad. The detection apparatus and the detection method can achieve grade evaluation of alkaline cleaning quality of the surface of the cold-rolled sheet, can increase the accuracy of evaluation and can avoid an accident of scratching.

The invention discloses a distributed optical fiber-based blast furnace hot blast stove temperature monitoring system and method, belonging to the technical field of hot blast stove temperature detection. In the present invention, the distributed optical fiber is horizontally wound on the top of the hot blast stove, the beginning and the end of the distributed optical fiber are connected to the distributed optical fiber sensor, the distributed optical fiber sensor is connected to the ARM processor, and the distributed optical fiber sensor receives the back-facing signal generated by the optical fiber. The scattered signal adopts a new temperature signal demodulation method: the double-ended single-channel demodulation method extracts the temperature value of each measurement point on the optical fiber and sends it to the ARM processor; the ARM processor is connected to the host computer through an industrial Ethernet interface. The invention uses distributed optical fibers to measure the surface temperature of the hot blast stove at multiple points. Since the optical fiber is directly in close contact with the hot blast stove shell, the temperature measurement result can reflect the real temperature of the hot blast stove body, which is convenient for early prediction of the damage of the furnace shell. It helps to increase the service life of the hot blast stove, reduce the coke ratio, and increase the productivity of the blast furnace.

The invention discloses a U-shaped gate valve, which relates to the field of valves. It includes a valve body, a valve stem, a valve plate and a valve seat. The valve body and the valve seat jointly clamp the valve plate, and the valve plate is U-shaped. , between the valve plate and the valve body, there is an elastic member that provides the thrust required for the sealing cooperation between the valve plate and the valve seat, and the elastic member includes a plurality of first elastic members installed on the valve body in a U-shaped arrangement , the first elastic member is tubular and is provided with a gap along the length direction, and the valve body and the valve seat are connected in a movable and adjustable manner. The present invention has the advantages of good working stability.

A method for controlling cooling water flow of twin-roll strip continuous casting rolls, each casting roll has more than one water inlet and corresponding water outlet, correspondingly, more than one independent cooling water channel is formed inside each casting roll A flow regulating valve is installed at the water outlet of each cooling water channel to regulate the flow of cooling water passing through the cooling water channel. A water pump with adjustable flow rate is used to provide cooling water to the two casting rolls. At the same time, the flow controller monitors the cooling water flow value qn in each cooling water channel of the casting roll, and averages the cooling water flow rate in the cooling water channel according to the flow value qn Value deviation, adjust the corresponding flow regulating valve to change the cooling water flow in the corresponding cooling water channel, and finally achieve the same flow rate in each cooling water channel in a single casting roll, so as to achieve uniform cooling intensity inside the casting roll. The method of the invention has the advantages of high cooling water flow control precision, fast response speed and the like.

The invention discloses a method for measuring the advance action range of progressive breakage of multi-level key layers, which relates to the field of measurement of the advance action range of overlying hard roof breakage after coal seam mining, and specifically solves the current domestic and foreign problems of accurately measuring the breakage action range of hard roofs. method. The present invention is based on on-site drilling and physical and mechanical parameters of coal and rock mass measured in the laboratory. A physical similar model is laid in the laboratory, and a high-definition high-speed camera is used to monitor the change of black speckle spots on the surface of the model in the whole process. The displacement change curve of the spot, the range where the displacement change is greater than zero is the leading influence range of the key layer. The invention adopts the research method of laboratory physical similarity simulation, which is easy and reliable, and the operation process is simple; the model parameters are all taken from the field, and the reliability of the test results is high; the prediction results can provide a theoretical basis for the support design of the advanced roadway on the spot , has practical significance and broad application prospects.