604results about How to "Realize screening" patented technology

The invention discloses a chemical engineering raw material mixing and stirring device convenient for screening. The device comprises a stirring box, the top of the stirring box is provided with a material inlet, the bottom of the stirring box is provided with a material outlet, one side of the stirring box is provided with a first motor through a carrier plate, the output end of the first motor is fixedly connected with the axle center of one side of a driving gear, the axle center, opposite to the first motor, of the driving gear is fixedly connected with one end of a driving rotating rod, and the other end of the driving rotating rod traverses through the stirring box, and is movably connected with the internal of the stirring box. A crushing roller is improved, teeth on the crushing roller can crush a chemical engineering raw material, the crushed chemical engineering raw material is screened under the cooperation of a filter screen frame, a stirring screen is improved, and the stirring screen can drive a stirring shaft and a stirring filter screen to simultaneously rotate through the rotating shaft and can stir the chemical engineering raw material in order to realize the screening and breaking effects in the stirring process.

The application discloses a user data analysis system based on big data in communication field, comprising a data gathering assembly used for acquiring data of mobile users from other network elements of a mobile network core network, and transmitting the acquired user data to a data processing and analysis assembly; the data processing and analysis assembly used for analyzing the user data of the corresponding type from the data gathering assembly according to a preset user data analysis model, and transmitting an analysis result to a data storage assembly for storage; a data service assembly used for extracting the required analysis result from the data storage assembly according to a data analysis requirement of a value-added service platform, and pushing the analysis result to the value-added service platform and an APP client; and the data storage assembly used for storing the acquired user data and the analysis result. The application also discloses a user data analysis method based on big data in communication field.

The invention discloses a method for describing a protocol by using an XML and a protocol resolving system built by the same, namely the method for describing the protocol by using the XML and a system which is built based on the method and is used for resolving an industrial Ethernet protocol. The method for describing the protocol by using the XML comprises two aspects, wherein one is the method for describing an Ethernet protocol format by using the XML and the other one is the method for describing a protocol suite relationship by using the XML. The system for resolving the industrial Ethernet protocol comprises two parts, namely a hardware system and a software system, wherein the hardware system comprises a network adapter and a host machine; and the software system comprises five units, namely a protocol load unit, a protocol library unit, a data capture unit, a protocol match unit and a data resolving unit. The method and the system can conveniently realize the modification and expansion of protocol contents, realize the screening, match and resolving of a multi-layer protocol, and have wide practical value and application prospect in the technical field of Ethernet.

The invention relates to a colored double-CCD (Charge Coupled Device) color-sorting system for delinting cotton seeds. The colored double-CCD color-sorting system comprises a vibratory feeding system, an optical detection system, a defective-product separation system, a human-computer interaction system and a sweeping system. The colored double-CCD color-sorting system is characterized in that the optical detection system comprises an LED RGB light-source system, a reference background unit and a colored CCD camera unit; a sorting interface processing unit is provided with two synchronously-arranged sensitivity thresholds and a defect-size customization control function. The colored double-CCD color-sorting system has the advantages that a colored double-CCD intelligent recognition algorithm is utilized to determine the feature information such as colors and shapes of the cotton seeds and screening on defective products such as red seeds, white seeds, seeds with cracks, damaged seeds and empty seeds in the processed cotton seeds is carried out, so that the germination rate and the commodification of the seeds are increased and the competitiveness of domestic color-sorting products is improved.

The invention discloses a hydroelectric generating unit vibration state region monitoring method based on real-time online monitoring. The method includes on the basis of the traditional hydroelectric generating unit vibration online monitoring, adopting a hydroelectric generating unit vibration wave recording analysis device to acquire and analyze original sample data of vibration monitoring points of the unit, and establishing a feature data storing history storing database of the vibration monitoring points; on the basis of historical feature data statistic analysis, the real-time unit vibration state region is determined comprehensively, and the real-time alarm information display and historical alarm information statistic and querying features are provided according to the determination results. The method has the advantages of high function comprehension, high result accuracy and convenience and easiness for usage.

The invention discloses multi-stage sand screening equipment for a building. The multi-stage sand screening equipment comprises a box body, a primary screening mechanism, a secondary screening mechanism and a tertiary screening mechanism, wherein the secondary screening mechanism is arranged on the right side of the box body, the secondary screening mechanism comprises a first screen plate and a material guide plate, the material guide plate is arranged below the first screen plate, and a backflow hole is formed in the position, located at the lower end of the material guide plate, of the boxbody. According to the multi-stage sand screening equipment for the building, a screen drum, scraping plates, an annular supporting plate, a second screen plate and a rotating shaft linkage mechanismare arranged, so that screening and recovery of fine sand in waste residues are achieved by swinging of the second screen plate, the screening effect is improved, repeated sand screening is avoided, and the screening efficiency is improved; the conical screen drum is arranged, and crushing cones arranged on the screen drum and screen holes formed in the screen drum are arranged, so that sand blocks in coarse sand are crushed, meanwhile, the waste residues in the coarse sand are separated efficiently, and follow-up treatment is facilitated; and the screen drum and the second screen plate are arranged, so that the secondary screening is carried out on the coarse sand, and the screening effect is improved.

The invention provides a hepatoxic substance sieving and evaluating method based on cell states labeled by fluorescence, which is a sieving and evaluating method combining a hardware / software system. The images are acquired by a fluorescence inverted microscope and a computer in real time, the biological information is processed and visualized, the liner dynamic range width of the living cell is measured by combining FDA dyeing, and then the relevant parameters for evaluating the hepatoxic substances are provided. The method is quick, sensitive and economical, and is used for quickly detecting the influence of the sieved sample on cell quantity, forms, migration, apoptasis and the like under the condition of maintaining cell structure and function integrity, accurately carrying out quantitative analysis on the activity of the cell labeled by the fluorescence specialty and detecting the activity change of the cell under the function of the hepatoxic substances. The method has reasonable design. The provided sieving and evaluating system has complete structure, and can be used for sieving and evaluating the hepatoxic substances.

The invention relates to a data preprocessing method and system, computer equipment and a storage medium. The method comprises the following steps of: obtaining at least one sampling data table and obtaining data stored in at least one field of the sampling data table; obtaining a mapping relationship between fields in a data model table and pre-configured table fields, wherein the mapping relationship comprises a one-to-one or one-to-many relationship between the fields in the data model table and the fields in the sampling data table; mapping the data stored in the fields of the sampling data table into corresponding fields of the data model table according to the mapping relationship so as to obtain a data-mapped data model table; and storing the data-mapped data model table. Accordingto the method, when business analysis is carried out on different pieces of bottom data, data screening does not need to be carried out repeatedly, and data cleaning can be automatically realized through adjusting the mapping relationship, so that the data processing efficiency is improved.

The invention provides a method for identifying voice. The method includes the following steps: acquiring to-be-identified voice data; extracting the Filter Bank feature and the MFCC feature in the voice data; configuring the MFCC feature as the input data of a GMM-HMM model, acquiring a first approximation probability matrix; configuring the Filter Bank feature as the input feature of the LSTM model having a connecting unit, acquiring a posterior probability matrix; and configuring the posterior probability matrix and the first likelihood probability probability matrix as the input data of the HMM model, acquiring a second likelihood probability matrix, based on the second likelihood probability matrix, acquiring a corresponding target word sequence from a phoneme decoding network. The method herein combines a mixed gaussian model and a deep learning model and is provide with the LSTM model which has the connecting unit and serves as the acoustic model, so that the method increases the accuracy in identifying voice. The invention provides an apparatus for identifying voice, a computer device and a storage medium.

The invention discloses a multi-mode string matching algorithm based on extended precision chaos hash. The main data structure in the algorithm comprises a character table containing control status information, a hash table with a mode mapped by an extended precision chaos hash function, and window information of multi-mode length information. The algorithm comprises the following steps: 1. preprocessing: storing the mode subjected to hash treatment into a hash table with the control state information character table used as an inlet; 2. taking a window starting with a character at any position of a text as a unit during mode matching process, sequentially carrying out hash processing on sub-windows in the current window, accessing the hash table through control state information of the character table, comparing the text in the sub-window with the mode with a specific hash value, and outputting the related information if matching is successful; and 3. sequentially scanning the text till the end of the text. The invention is suitable for a parallelized string matching algorithm with large mode data volume as well as centralized mode length, and can be applied to the technical field applying multi-mode string matching methods.

The present invention is shot and sand blasting system and method for cleaning residual carbon electrode from electrolyzing aluminum. The cleaning system includes one shot and sand blasting chamber as sealed space for shot and sand blasting operation for processing the surface of residual carbon electrode from electrolyzing aluminum to eliminate impurity and recover carbon; one piece of shot and sand blasting equipment including one automatic continuous shot and sand blasting device and one automatic shot and sand blasting mechanism with spraying guns; and one shot and sand recovering device. The present invention is favorable to recovering carbon for reuse.

The invention relates to the technical field of biology, in particular to a nano-antibody GN1 specifically combined with a GPC3 protein. The nano-antibody GN1 is composed of a variable region of a heavy-chain antibody, the variable region of the heavy-chain antibody comprises an antigenic determinant complementary region and a skeleton region, the skeleton region is selected from the group consisting of FR1, FR2, FR3 and FR4 and homologous sequences thereof, the antigenic determinant complementary region is selected from the group consisting of CDR1, CDR2 and CDR3 and homologous sequences thereof, the amino acid sequences of the CDR1 to the CDR3 are shown in the formulas of SEQ ID NO. 1 to SEQ ID NO. 3, the amino acid sequences of the FR1-4 are shown in formulas of SEQ ID NO. 4-7, the amino acid sequence of the antibody is shown in the formula of SEQ ID NO.8, and the nucleotide sequence for encoding the amino acid is shown in the formula of SEQ ID NO.9. The nano-antibody GN1 can be specifically combined with hepatoma carcinoma cells highly expressing the GPC3 protein to inhibit hepatoma carcinoma cell proliferation. The amino acid sequence of the nano-antibody GN1 or the nucleotidesequence of the nano-antibody GN1 or the recombinant plasmid containing the nucleotide sequence of the nano-antibody GN1 or the recombinant cell containing the recombinant plasmid containing the nucleotide sequence of the nano-antibody GN1 can be applied to research and development of diagnostic reagents and drugs for treating liver cancer.

The invention relates to a seed sorting device, which comprises a frame, a seed loading device, a sorting device and an image acquisition system. The seed loading device comprises a vibration plate and a seed loading conveyor belt mounted on the frame; both ends of the seed loading conveyor belt are respectively a seed loading terminal and a seed discharge terminal; and a lower end of a seed outlet of the vibration plate is the seed loading terminal of the seed loading conveyor belt. The sorting device comprises a sorting conveyor and a sorting chute, which are installed on the frame. The image acquisition system comprises a host computer, an upper camera and a lower camera; and the upper camera and the lower camera are installed on the frame. The seed sorting device provided by the invention utilizes a computer image processing technology to extract the shape character parameters including size, weight, shape and color of the seeds; the extracted parameters are compared with those preset by a user, so as to determine whether the seeds meet the requirements of seed breeding. The sorting device separates the seeds meeting breeding requirements from unqualified seeds, realizes the function of automatic precise seed screen, and is suitable for sorting and screening of a plurality of varieties.

The invention discloses a device for simulating a ground source heat pump. The device comprises a ground layer simulating system, a heat exchanger simulating system and a data collecting system, wherein the ground layer simulating system is composed of a weighbridge, a stainless steel sleeve, soil, a drill hole, a cover board and a constant-temperature water bath kettle; the heat exchanger simulating system is composed of backfill material, an U-shaped pipe, a low-temperature constant-temperature groove, a self-absorption clean water pump, a flowmeter, a tee and a valve; the data collecting system is composed of a temperature / humidity recorder, a PT100-type thermal resistor and a temperature / humidity transducer; the backfill material of the heat exchanger simulating system is arranged in the drill hole of the ground layer simulating system; and the PT100-type thermal resistor of the data collecting system is arranged in the soil of the ground layer simulating system. According to the invention, the device can be used for researching temperature distribution with different depths and different radial soil layers under the action of a buried-pipe heat exchanger and further investigating a heat exchange pattern in the soil so as to realize calculation and verification of a heat transferring model; furthermore, the device can be used for investigating the influence of different backfill materials to the total heat exchange effect and realizing screening and estimation on the backfill materials; in addition, the device also can be used for the research on the influence and the like of different circular water flows to heat exchange quantity in cold or hot working conditions.

The present application discloses a method and apparatus for displaying page information. A specific implementation of the method comprises: detecting a predetermined operation acting in a predetermined position of a browser for displaying pages, wherein the predetermined position comprises a position associated with a background page in the browser, the background page comprises a page linked by a page displayed in the browser and / or a page corresponding to another page label besides a page label corresponding to the page displayed in the browser; in response to the predetermined operation, acquiring content of the background page; generating content preview information of the background page according to a keyword and / or a picture of the background page; and displaying the content preview information. The implementation may expand the capability of the browser in displaying page content.

The invention embodiment discloses a PMU (Phasor Measurement Unit) data filtering method for generator synchronous reactance parameter identification. The PMU data filtering method for the generator synchronous reactance parameter identification comprises building a mathematical model for identifying the generator synchronous reactance parameters according to the steady-state operation characteristic of a synchronous generator; determining the needed PMU measurement data and the needed electric parameters of the identification according to the mathematical model and converting each electric parameter to a per-unit value; calculating according to the sensitivity mechanism to obtain the sensitivity of the generator synchronous reactance to the each electric parameter, obtaining the influence of a PMU measurement error of each electric parameter on synchronous reactance identification precision and consequently judging whether the PMU measurement data can be used or not for the generator synchronous reactance parameter identification to achieve the PMU measurement data filter. The PMU data filtering method for the generator synchronous reactance parameter identification has the advantages of obtaining the conditions that the PMU data can be used for the generator synchronous reactance parameter identification, achieving the PMU data filter and consequently improving the identification precision of the generator synchronous reactance parameters.

The invention belongs to the field of biomedicine and relates to neurons directly induced from human skin cells and a preparation method for the neurons. By the method, induced human neurons which can perform stable passage are directly prepared by importing complementary deoxyribonucleic acid (cDNA) containing reprogramming transcription factors, namely Sox2, Ascl1 and Myt1l into isolated adult skin cells, screening cells which express a human neuron marker and cloning the cells which express the human neuron marker. The invention is characterized in that (1) the neurons express human neuron-specific marker protein in vitro; and (2) the neurons can survive in vivo and exert functions. The human neurons with the functions are obtained without the process of multipotential stem cells, so that the technology is relatively simple and effective; a heterologous feeder layer is avoided, so that the neutrons have a good clinical application prospect; and the report related to the tumorigenesis is not known about the adopted transcription factors, so the neurons have relatively high biosafety.

The invention belongs to the technical field of soil remediation, and particularly relates to an efficient soil remediation method. A soil remediation device adopted in the efficient soil remediationmethod comprises a box body, a motor and a controller; the box body is internally provided with a crushing cavity, a grinding cavity and a collecting cavity from top to bottom in sequence; a rotary rod is vertically arranged on the middle part of the top wall of the box body, a rotary shaft is horizontally and rotatably installed at the bottom of the box body, a soil inlet is formed in one side atthe top of the box body, and a transmission shaft is arranged on the other side at the top of the box body; crushing plates are symmetrically arranged at the bottom end of the rotary rod, and the topend of the rotary rod extends out of the top wall of the box body and is fixedly connected with a first bevel gear; transmission between the rotary shaft and the transmission shaft is carried out through a belt; a second bevel gear is fixedly connected to the other end of the transmission shaft, and the second bevel gear and the first bevel gear are subjected to transmission in a meshing mode; anelastic separation plate is arranged on the lower parts of the crushing plates; and a baffle is arranged on the lower part of the elastic separation plate. According to the efficient soil remediationmethod, soil is subjected to plant cultivating remediation, so that the heavy metal content in the soil is reduced, and the soil properties of the soil are improved.

The invention discloses a fruit unshelling device, which comprises a tube body, a cover plate, a driving device and a machine frame and is characterized in that the unshelling device is also provided with a stirrer, a jacket and a sieving groove, the jacket is arranged at the bottom of the tube body, a propeller and a stirring rod are arranged on a stirring shaft of the stirrer, the bottom of the tube body is provided with a tube body bottom hole plate, the inner wall of the tube body is provided with a baffle strip, the lowest end of the jacket is provided with a ball valve A, the sieving groove is arranged under the jacket, the middle of the sieving groove is provided with a movable hole plate, the bottom end of the sieving groove is provided with a ball valve B. In the work process, the fruit generates kneading movement through mutual extrusion under the effects of the baffle strip and the stirrer in the tube body, so the fruit unshelling is reached. The fruit unshelling device is applicable to the dry type and wet type unshelling of the fruit, the structure is reasonable, the operation is simple and convenient, the fruit extraction rate, the efficiency and the quality are improved, the fruit unshelling device is particularly suitable for the fruit unshelling, the beneficial conditions are created for the propagation acceleration of precious tree species, and good economic benefits and social benefits are realized.

The present invention discloses a microfluidic chip-based single-cell liquid droplet high-throughput screening method, which comprises: (1) generating a microbial single-cell liquid droplet on a microfluidic chip; (2) removing the unwrapped microbial liquid droplet; (3) fusing the cultured microbial single-cell liquid droplet and a small molecule compound biosensor on the microfluidic chip; and (4) making the biosensor respond to the metabolite in the fused liquid droplet, and carrying out fluorescence detection and sorting. According to the present invention, the single-cell liquid droplet culture is performed at the microfluidic chip, such that thousands of the micro-bioreactors are constructed on the chip so as to trace the growth characteristics of the microbial cells to be screened and screen; and through the liquid droplet fusion technology, the fluorescent labeling is performed on the microbial cell liquid droplet to be screened by the small molecule metabolite biosensor so as to screen the target extracellular product.

The invention relates to the technical field of computers, and provides a model training method and terminal equipment. The method comprises the steps of obtaining a to-be-trained model and training data; wherein the training data comprises a plurality of samples, and each sample corresponds to a probability value; selecting a plurality of samples from the training data according to the probability value of each sample to generate a training data set; training the to-be-trained model through the training data set, and obtaining an recognition result of the to-be-trained model for the trainingdata set; calculating a clustering effect evaluation value of the training data set according to the recognition result and the training data set; and adjusting the probability value corresponding toeach sample in the training data set according to the clustering effect evaluation value. According to the method, model training and training data screening are combined, so that the training efficiency of model training can be improved; in the training iteration process, the effect of difficult-to-recognize samples on model training can be enhanced, and then the robustness and accuracy of the trained model are improved.

The invention discloses a dual-electron injection terahertz folded travelling-backward wave amplifier, and is applied to the technical field of vacuum electron. A mutual effect of two beams of round electron injection with different speeds and the same-frequency electromagnetic wave is employed, working voltages of the two beams of electron injection are respectively synchronized with a forward space harmonic and a reverse space harmonic, an electromagnetic wave signal of which a travelling wave is amplified is propagated forwards, then acts on an oscillation loop of a backward wave and is used as an input signal of the backward wave so as to form a folding loop, an amplified travelling wave signal in a feedback loop acts in the travelling wave to promote amplification of the travelling wave, thus, the electromagnetic wave in a slow wave circuit can participate in amplification of the travelling wave and is simultaneously participate in amplification of the backward wave to form a nature feedback passage, and the energy of the device can be continuously increased unit the beam-wave interaction power is saturated.

The invention discloses a multi-stage screening device, which relates to the technical field of traditional Chinese medicine processing equipment. The invention includes a sieve hopper. The sieve hopper includes a primary screening mechanism and a secondary screening mechanism. A reciprocating rolling assembly is arranged above the primary screening mechanism. The rolling assembly includes a pressing roller and a moving assembly. A load-bearing plate parallel to the feeding screen is arranged above the feeding screen. The moving assembly includes a moving bracket and a driving cylinder. The moving bracket includes a horizontal connecting plate fixedly connected to the piston rod of the driving cylinder. And the two mounting frames symmetrically arranged on the lower surface of the horizontal connecting plate, two grooves corresponding to the two mounting frames are dug on the load-bearing plate, the ends of the two mounting frames are respectively connected to the rotating shaft through the two grooves, and the pressure roller is sleeved on the On the rotating shaft, the powder of the present invention passes through the three-stage screening of the feeding screen, the secondary screen and the third screen in order to ensure the screening quality of the powder, and through rolling and vibration, the screening and circulation of the powder are ensured. , which improves the screening efficiency.

The embodiment of the invention provides a data processing method and device, electronic equipment and a storage medium, and the method comprises the steps: obtaining service request data; generatinga service identifier according to the service request data; judging whether the service identifier is matched with a screening identifier in a preset screening database or not; if the service identifier is not matched with a screening identifier in a preset screening database, responding to the service request data; And if the service identifier is matched with a screening identifier in a preset screening database, returning a preset error state message. According to the embodiment of the invention, the service request data can be screened; According to the method and the device, repeated response to the service request data with the same service identifier is avoided, service faults are effectively avoided, and the problem that in the prior art, the service request data and result data obtained after the service request data are responded need to be subjected to consistency processing, so that the processing logic of the service request data is complex can be solved.

The invention provides a dry-type granulator for feed processing, and relates to the field of feed processing. The dry-type granulator for feed processing comprises a box body, wherein supporting rodsare welded to the bottom of the box body; vibration-absorbing mechanisms are fixedly mounted at the bottoms of the supporting rods; a screening mechanism is arranged on the top of the box body; a feed port adapted to the screening mechanism is formed in the top of the box body; the bottom side of the box body is downwards inclined; a side box is welded to the side wall of the box body; a discharge port communicated with the inner part of the side box is formed in the side wall of the box body and in the bottommost end. According to the dry-type granulator for feed processing, a material is added into a screening box through a feed hopper, a vibrating motor drives a hitting roller to rotate to continuously hit the screening box so as to vibrate the material inside the screening box, impurities smaller than the material drop out of the screening box through screening holes, and the material slides out of the screening box through material passing holes and enters the box body through the feed port, so that the impurity content of the material is reduced and guarantee of the granulating quality is facilitated.

The application discloses a target user displaying method and a system based on time matching degree. The method includes: identity information of a user terminal and identity information of a plurality of target users are extracted; the identity information comprises experiencing organizations and corresponding time parameters; the time matching degree of the identity information of the user terminal and the identity information of each target user is calculated; the time matching degree is specifically the overlapping degree of the time parameters corresponding to the same experiencing organizations; each target user is ranked from high to low according to the time matching degree; and each target user is displayed to the user terminal according to the rank.

The invention discloses a sand screening device with a drying function, which comprises a box body, a sand inlet and a sand outlet, a shaker box is arranged on the upper part of the inner cavity of the box, the shaker box is in contact with a shaker, and the shaker drives the shaker The box vibrates back and forth; there is a sieve barrel that can rotate at high speed directly under the box body, and a heating plate is installed outside the sieve barrel, and the fine sand thrown out by the sieve barrel falls on the heating plate. The invention solves the problem that the existing sand screening device cannot finely screen the sand and dry the sand at the same time.

The invention discloses a shell-breaking device for increasing the germination rate of seeds. The shell-breaking device comprises a shell-breaking chamber, a motor, a rotating shaft, sieve plates, a mounting block and a stirring rod, and is characterized in that the shell-breaking chamber is arranged on a bracket, a feeding opening, a discharging opening, a residual outlet are formed in the shell-breaking chamber, the inner wall of the shell-breaking chamber is provided with a scrubbing layer, the motor is arranged on the shell-breaking chamber, the rotating shaft is arranged in the shell-breaking chamber, one end of the rotating shaft is connected with the motor, the sieve plates are arranged in the shell-breaking chamber, the mounting block is arranged on the rotating shaft, the rotating shaft is provided with the stirring rod, and the stirring rod is provided with a scrubbing sleeve. According to the shell-breaking device for increasing the germination rate of the seeds, the inner wall of the shell-breaking chamber is provided with the scrubbing layer, the stirring rod is provided with the scrubbing sleeve, the stirring rod can drive the seeds in the shell-breaking chamber to rotate, the scrubbing layer and the scrubbing sleeve conduct scrubbing and shell-breaking on the surfaces of the seeds, the shell-breaking efficiency and quality of the seeds are improved, the multiple layers of sieve plates are arranged in the shell-breaking chamber, debris generated by seed shell-breaking can be separated from the seeds, screening of the seeds is achieved, and therefore the germination rate of the seeds after shell-breaking is increased.

The invention provides a layered type sand and stone screening machine. The layered type sand and stone screening machine comprises a rack body, a screening mechanism, a crank sliding block mechanismand two spring extrusion mechanisms, wherein a driving motor is fixedly installed on a receiving frame, and a screening frame is driven to perform reciprocating motions through the crank sliding blockmechanism; first extrusion springs are installed between the front end of a sliding rail and the receiving frame, second extrusion springs are installed between the receiving frame and the screeningframe, and third extrusion springs are installed between a supporting rack and the tail end of the sliding rail; and the extrusion springs generate reverse extrusion force under driving of the crank sliding block mechanism, the receiving frame and the screening frame are made to perform rapid relative motions, and sand and stone screening separation is realized. The layered type sand and stone screening machine has the advantages of being compact in structure, low in cost, easy to operate and the like, the labor force can be greatly reduced, and the production efficiency is improved.