46results about How to "Realize screening" patented technology

The utility model discloses a continuous tea processing device, including the grinding disc, the outer side of grinding disc is equipped with the casing, casing lower part fixedly connected with the falling platform, the falling platform lower part fixedly connected with first falling cylinder, the grinding disc lower part fixedly connected with second falling cylinder, second falling cylinder is equipped with in first falling cylinder inside, second falling cylinder lower part fixedly connected with first connecting panel, first connecting panel outer side fixedly connected with the gear ring, the gear ring lower part rotatablely connected with the screening box, the screening box upper part is equipped with the feed inlet of facing first falling cylinder, the screening box one side fixedly connected with second connecting panel, second connecting panel lower part fixedly connected with first motor, first motor power end penetrates second connecting panel fixedly connected with the gear, the gear is engaged with the gear ring, can prevent the tea of grinding disc upper part remanence, causes the tea cleaning difficult, causes the tea waste.

The application discloses a machine learning algorithm for screening of metal elements in a diatomic catalyst full cycle based on product yield prediction and application thereof, and the algorithm comprises the following steps: (1) collecting attribute features of metal elements in the diatomic catalyst as a feature space 1; (2) preliminarily screening the attribute features according to comprehensive scores of feature importance to obtain a feature space 2; (3) performing feature operation processing on the feature space 2 to generate a multivariate descriptor space matrix; (4) performing dimension reduction processing on the multivariate descriptor space matrix by combining a gradient boosting regression model with a recursive feature elimination algorithm; (5) further screening to obtain an interpretable descriptor by using a least absolute shrinkage and selection operator; and (6) applying the interpretable descriptor to a random forest regression model to screen a catalyst for a propane dehydrogenation reaction to prepare propylene. The application can solve the problem that a traditional descriptor is difficult to directly predict a catalytic product yield.

This invention relates to the field of graphite waste treatment technology, and more particularly to a method for preparing special graphite materials from isostatic pressing graphite waste, comprising the following steps: waste collection: firstly, the waste generated from isostatic pressing graphite production is collected and processed centrally; waste treatment: the collected waste is centrally fed into a purification module, where impurities are screened and removed; waste crushing: after the isostatic pressing graphite waste has been screened, it is pushed into a crushing device for crushing; material proportioning, pressing, primary calcination, and graphitization treatment; this invention, by processing the waste from isostatic pressing graphite production through the screening and purification processes described above, followed by crushing, can then be proportioned, fed into a mixing pot, and then pressed, calcined, and graphitized to produce special graphite materials, thus avoiding environmental pollution from waste and achieving full utilization of resources.

The invention discloses a method for bifluorescence quantitative detection of epithelial cells of a lacrimal gland organ and application. The method comprises the following steps: providing a mouse lacrimal gland organ; a recombinant adeno-associated virus combination is added to the organoid, the combination comprising: a first AAV vector comprising a promoter specifically driving the expression of alveolar epithelial cells and a first fluorescent protein coding sequence; the second AAV vector contains a promoter for specifically driving expression of myoepithelial cells and a second fluorescent protein coding sequence; according to the method, the two cells can be visually distinguished, and by calculating the fluorescence area or the number of the cells, the alveolar / muscular epithelial cell proportion is established as a damage index, so that high-throughput drug screening is realized.

The utility model relates to a screening device for grain and oil processing, which comprises a bottom frame, the top of the bottom frame is fixedly connected with a shell, the shell is internally provided with a screen drum, the top of the bottom frame is provided with a driving mechanism, one side of the screen drum is provided with a dust falling mechanism, and the driving mechanism comprises a first motor fixedly connected to the top of the bottom frame. One end of the first motor is fixedly connected with a linkage assembly, the outer surface of the shell is fixedly connected with a movable wheel, one end of the linkage assembly is connected with the movable wheel, one end of the shell is fixedly connected with a feeding hopper, the other end of the shell is fixedly connected with a discharging hopper, and the feeding hopper and the discharging hopper are both in an inclined state. According to the screening device for grain and oil processing, the driving mechanism is arranged, power is transmitted to the movable wheel through the linkage assembly, the movable wheel rolls in the rolling groove in the outer surface of the screen drum, and therefore the screen drum is driven to rotate stably, and grain screening can be achieved through the driving mode.

The invention discloses a fission yield experiment data screening method, and relates to the technical field of nuclear data evaluation.The method comprises the steps that S1, fission yield experiment data are obtained from an EXOR database, and the experiment data are grouped; s2, fitting each group of fission yield experimental data by adopting a Zp model, and determining model parameters; the fission yield is calculated according to the determined model parameters, so that a yield calculation value is obtained; s3, calculating the deviation between the fission yield experiment data and the fission yield calculation value obtained in the step S2; and S4, screening the experimental data according to the deviation obtained in the step S3. According to the method provided by the invention, the evaluation efficiency can be effectively improved, the research period is shortened, and technical support is provided for further establishing an experimental database.

This invention discloses a hovering method and system for firefighting drones based on laser guidance and reliable fusion, relating to the field of drone hovering control technology. By deploying laser guidance devices in the high-altitude firefighting operation area, a stable spatial guidance reference is established to guide the drone into the target hovering area and continuously receive coded laser beams. Based on this, laser reception features are extracted and a link reliability factor is calculated to assess the reliability of laser deviation observation information and suppress anomalies. Simultaneously, the laser deviation observations are aligned with the attitude, velocity, and altitude information output by the inertial navigation unit using a time reference and coordinate consistency correction to form a fused data set. Through adaptive reliable fusion and consistency constraints, a hovering error vector for hovering control is constructed, driving the flight control unit to dynamically adjust the drone's hovering position, thereby improving the stability and reliability of drone hovering positioning during high-altitude firefighting operations.

The invention discloses a ship operation data backtracking method based on an error correction algorithm, which relates to the field of maritime engineering, solves the problem of high error rate of ship operation data abnormity backtracking, and comprises the following steps: setting a track monitoring area of a target ship in the navigation process, analyzing ship navigation data based on the track monitoring area, and determining the ship operation data according to the analyzed ship navigation data. Obtaining an optimized ship track of the target ship; the optimized ship track is analyzed, the target ship is classified according to the historical track of the historical ship, and the historical ship of the same category as the target ship is obtained; analyzing the ship operation data, judging an abnormal condition of the ship operation data corresponding to the target ship in combination with historical operation data, and generating a corresponding abnormal signal; after the abnormal signal is received, a ship operation function is constructed according to the historical operation data of the same type of historical ships, abnormity backtracking is conducted on the ship operation data of the target ship based on the ship operation function, and accurate backtracking of the ship operation data is achieved.

The utility model relates to the technical field of machine-made sand preparation, in particular to a machine-made sand classifying and screening device which comprises a vertical cylinder, a quantitative feeding mechanism, a driving mechanism, a sound insulation mechanism, a classifying screen mechanism, a supporting mechanism and a finished product machine-made sand recycling mechanism. A sound insulation mechanism is arranged on the outer wall of the vertical cylinder, the vertical cylinder is connected with the ground through a supporting mechanism, the classifying screen mechanism comprises screen meshes which are sequentially arranged in the vertical cylinder from top to bottom, a finished product machine-made sand recycling mechanism is connected to the outer wall, where one end of each screen mesh is located, of the vertical cylinder, and the mesh number of the screen meshes is sequentially increased from top to bottom. The top end of the vertical cylinder is connected with a feeding pipe, and the feeding pipe is provided with a quantitative feeding mechanism. The vertical space can be fully utilized, environmental pollution is reduced, the automation level of the device is provided, the screening quality is guaranteed, and multi-level grading screening can be achieved.

The application discloses an energy-saving sound-insulation building material melting and blending device and method, relates to the technical field of energy-saving sound-insulation building material melting and blending, and comprises a blending box. The energy-saving sound-insulation building material melting and blending device and method have the advantages that when raw material melting and blending operation is carried out, large-particle raw materials are located on the screening plate, in the melting and blending process, each heat conduction rod directly transmits heat at the heating layer to the material close to the center point of the screening plate, compared with the raw material melting and blending below, heat transmission above is faster, meanwhile, a forward and reverse motor is started, the forward and reverse motor drives stirring blades and annular cutting blades to cut and stir the large-particle raw materials in the preliminary melting state, so that the melting and blending degree of the large-particle raw materials above is close to the melting and blending degree of the small-particle raw materials below, the melting and blending time does not need to be prolonged according to the difference of particles, and the effect of accelerating the melting and blending progress of the raw materials is achieved.

This disclosure pertains to the field of batteries, specifically a method and system for early warning of thermal runaway in automotive power batteries. It involves collecting data on individual battery cell voltage, total voltage, current, and temperature to construct an original feature sequence. This sequence is then fused using multi-head one-dimensional convolution to integrate local temporal features at different time scales, generating a fused feature sequence. Temporal encoding is performed using a gated recurrent unit with an added anomaly response gate. Anomaly scores are calculated based on the degree to which the input features deviate from the historical mean, and the hidden state is updated accordingly. The output consists of a hidden state sequence and anomaly score sequence. A dual-channel attention module is used to calculate temporal and feature attention weights, which are then coupled through a Hadamard product to generate a coupled attention weight matrix. The hidden states are weighted and aggregated to obtain a context vector, which is decoded by a fully connected network to determine the thermal runaway risk probability. This probability, combined with the rate of change, generates an early warning threshold, enabling real-time and accurate thermal runaway early warning triggering.

The utility model relates to the technical field of soybean processing, and provides a soybean screening and cleaning device. The soybean screening and cleaning device comprises a water pool, a conveying net belt arranged in the water pool and a bubble generating device arranged in the water pool. The pool comprises a first part extending in the length direction of the pool and a second part inclining upwards. A baffle is arranged between the two opposite side walls in the width direction of the first part, and an overflow opening for water to flow out is formed. According to the soybean screening and cleaning device, through the arrangement of the pool, the bubble generating device, the baffle and the overflow port, bubbles generated by the bubble generating device can peel off fine impurities attached to the surfaces of soybeans, meanwhile, the pool can conduct flotation on the soybeans, impurities and bad soybeans with the same particle size as the soybeans are separated, and therefore the soybeans are screened and cleaned. Meanwhile, screening and cleaning of the soybeans are achieved. And floating impurities are intercepted through a baffle, so that the impurities are discharged through an overflow port, the impurities are prevented from being mixed into the soybeans again, and the screening effect on the soybeans is improved.

This invention provides a method for manufacturing VDMOS. The method acquires an initial image of the VDMOS under test, determines the device model and pin count of the VDMOS based on the initial image, and obtains preset detection points and corresponding preset pressures on each pin according to the device model. Based on the preset detection points and preset pressures, the pressure heads in the upper and lower test groups are controlled to perform upper and lower compression tests on the pins of the VDMOS under test, obtaining a first detection result. Then, the pressure heads in the left and right test groups are called to perform left and right compression tests on the pins corresponding to the first detection result, obtaining a second detection result. This invention automatically matches test parameters by identifying the device model, and utilizes physical compression in the upper and lower and left and right directions combined with image analysis to detect the state of the pins under stress, thereby identifying pin defects and achieving the detection of the physical quality of the manufactured VDMOS.

The present application relates to the technical field of multi-source heterogeneous signal data fusion, and discloses a method, system, device and medium for constructing a feature space of multi-source heterogeneous data of an excitation transformer, comprising: converting time-frequency domain information into a two-dimensional graph using an improved symmetric point pattern method on data in a vibration signal window, extracting graph features using an image feature descriptor, and forming a vibration signal feature vector; extracting time domain statistics of data in a thermoelectric signal window, evaluating feature importance of the time domain statistics using a random forest algorithm, correcting feature scores by introducing a stable weight, and then performing feature sorting and dimension optimization, screening an optimal feature subset, and forming a thermoelectric signal feature vector; and splicing the two feature vectors to construct a multi-source heterogeneous data feature space of the excitation transformer. The present application constructs an excitation transformer feature space with better discrimination and stability, effectively improving the accuracy of equipment operation state evaluation and fault diagnosis.

The invention provides a visualization method and system for self-adaptive matching of a display object resolution and a fusion processing mode. The method provided by the invention comprises the following steps: before to-be-displayed content reaches a video physical port of a visualization system, determining a display template according to a plurality of to-be-controlled visualization system display sizes; selecting a target visualization system according to the content density of the to-be-displayed content; determining a display object type in the to-be-displayed content, determining a fusion processing mode of the display object according to the display object type, determining a fused display position of each display object according to the display scene, supplementing a display template corresponding to the target visualization system, and obtaining a target display template; different types of display objects are obtained by utilizing a video physical port, each display object is processed by utilizing a video processor according to a fusion processing mode of each display object, and a plurality of processed to-be-fused display objects are displayed in the same canvas according to a fused display position in a target display template to obtain a fused canvas; and displaying in the target visualization system.

The application discloses an infrared radiometer rotational flow purging device and a design method, and relates to the technical field of aero-engine monitoring. The device comprises a purging airflow sleeve, an air inlet, a rotational flow generating pipe, a first pipe opening, a second pipe opening, an optical sensing element, and rotational flow generating holes. The open end of the purging airflow sleeve is opposite to a monitoring heat source. The rotational flow generating pipe is coaxially arranged in the purging airflow sleeve. The rotational flow generating pipe has the first pipe opening facing the monitoring heat source and the second pipe opening extending out of the purging airflow sleeve. The middle section of the rotational flow generating pipe is used for arranging the optical sensing element for receiving infrared radiation. The pipe body of the rotational flow generating pipe is provided with a plurality of rotational flow generating holes between the position of the optical sensing element and the first pipe opening. The airflow is separated from the large-size pollution particles at the rotational flow generating holes and enters the rotational flow generating pipe to form rotational flow. The application separates and blocks the pollutants before the optical sensing element through the multiple airflows containing rotational flow, fundamentally reduces the lens fouling rate, and improves the measurement stability and reliability.

The utility model discloses a screening device for coal processing, including collecting box no.

This application discloses a screen image detection method, electronic device, and storage medium. The method includes: acquiring a screen image of a screen to be detected; inputting the screen image into a preset detection network for position detection, and outputting at least one detection box; extracting a screen image to be detected from each detection box; inputting each screen image to be detected into a preset classification network, performing integrity detection on each screen image through a first classification head of the classification network, outputting a first classification result, and performing power-on status detection on each screen image through a second classification head of the classification network, outputting a second classification result; determining the detection result of the screen image based on the first and second classification results of each screen image to be detected, or filtering multiple screen images to be detected based on the first classification result and the corresponding second classification result to obtain a target screen image. The embodiments of this application achieve the filtering of high-quality screen images, improving the quality and efficiency of review.

This application relates to a method, system, device, and medium for intelligent screening of clothing images. The method includes: acquiring a dataset of clothing images to be processed; performing basic quality filtering to obtain a screening set; performing image enhancement on the screened images to generate a standardized set; extracting the visual feature vector and quality score of each image; identifying the main body region based on the features using a clothing region segmentation model to generate a mask; combining the mask and features to extract semantic labels of design elements to form a structured design point set; matching the design point set with a pre-built clothing trend database to generate a trend matching score; simultaneously calculating a design innovation score based on its historical frequency of occurrence; dynamically weighting the quality score, trend score, and innovation score to generate a comprehensive score; and finally, performing a hierarchical decision based on the comprehensive score and quality score, outputting the images to be added to the database and their corresponding level labels. This application realizes intelligent evaluation and screening of clothing designs.

The utility model relates to the technical field of crop sorting, and discloses an efficient material sorting device which comprises a bottom plate, two fixing columns are fixedly connected to the top of the bottom plate, two limiting plates are fixedly connected to the outer portions of the two fixing columns, and two springs are arranged on the outer portions of the two fixing columns in a sleeving mode. Fixing blocks are slidably connected to the exteriors of the two fixing columns, one ends of the springs are fixedly connected to the exteriors of the fixing blocks, the other ends of the springs are fixedly connected to the exteriors of the limiting plates, a placing table is fixedly connected to the top of the bottom plate, and a rotating assembly for providing rotating capacity is arranged at the top of the placing table. The outer portion of the rotating assembly is rotationally connected to the inner wall of the fixing block. According to the material sorting and screening device, the problem that when part of materials are packaged, due to the fact that the sizes and the shapes of the materials are not uniform, a large number of materials cannot be quickly and accurately sorted and screened is solved through the structure.

The embodiment of the application is suitable for the mining technical field, and provides a filling material proportioning scheme generation method and device.The method comprises the following steps: determining the type of tailings used as filling material; determining a plurality of proportioning schemes according to the type of tailings, wherein any proportioning scheme has a corresponding sand ratio and an associated parameter; obtaining historical filling data, and screening a plurality of to-be-tested proportioning schemes from the plurality of proportioning schemes based on the historical filling data; and when receiving strength test results of the plurality of to-be-tested proportioning schemes, determining a target proportioning scheme from the plurality of to-be-tested proportioning schemes according to the strength test results. By using the above method, the proportioning scheme of filling material can be quickly generated, and the generation efficiency of the proportioning scheme of filling material is improved.

This invention relates to the technical field of slag powder treatment devices, and discloses a pretreatment device for steel slag powder. The device includes a housing, a crushing box fixedly mounted on the top of the housing, a motor fixedly mounted on the outer wall of the crushing box, a gear fixedly mounted on the output shaft of the motor, a primary crushing rod fixedly mounted on the outer wall of the gear, a fixed platform fixedly mounted on the side wall of the housing near the motor, and a second motor fixedly mounted on the top of the fixed platform. This pretreatment device for steel slag powder, through its housing, crushing box, primary crushing rod, cam, screen, return spring, and crossbar structure, allows the user to move the screen by rotating the cam during operation, causing the screen to reciprocate. This increases the contact area between the screen and the slag powder, thereby achieving the effect of screening and grading the slag powder, and improving the practicality of the device.

This invention provides a method and system for mixing substances inside a magnetically controlled droplet. The method includes: adding a droplet containing the substance to be mixed onto a hydrophobic solid substrate infused with a magnetic fluid, causing the magnetic fluid to rapidly envelop the contacting droplet to form a magnetically responsive liquid shell; controlling the movement of the magnetically responsive liquid shell to drive the movement of the enveloped droplet, thereby accelerating the mixing of the substances inside the droplet. The system includes: a hydrophobic solid substrate and a magnetic fluid spread on the surface of the hydrophobic solid substrate. This invention, by causing the magnetically responsive shell enveloping the droplet to rotate around the droplet, generates shear flow at the two-phase interface, increasing the internal dynamics of the droplet and significantly accelerating the mixing process of the substances inside the droplet.

The application provides a soil and water conservation monitoring method and system based on unmanned aerial vehicle remote sensing, and relates to the technical field of image analysis. First, multispectral image data and laser point cloud data are collected to generate a first vegetation index change map and construct a digital surface model, and the digital surface model is used to obtain terrain change point cloud data. Then, the change map and the point cloud data are spatially superimposed and analyzed to obtain a spatially coincident region, and vegetation change map patches and terrain deformation map patches that meet a first preset condition in the spatially coincident region are extracted to obtain a potential erosion area. Subsequently, according to the three-dimensional point cloud features, an active erosion area is segmented from the terrain change point cloud data, and the soil loss amount is calculated according to the three-dimensional point cloud data. Finally, according to the spatial distribution information of the active erosion area and the soil loss amount, a soil and water conservation monitoring result is generated. The technical scheme provided by the application improves the accuracy and early warning capability of soil and water loss monitoring in complex slope surface scenarios.

The application discloses a cleaning machine for improving food quality and safety, and relates to the technical field of food cleaning machines, which comprises a protection box, a cleaning box and a partition plate arranged in the protection box, a blanking plate arranged in the cleaning box, a plurality of rotating rods arranged on the blanking plate, a cleaning plate arranged outside the rotating rods for cleaning food materials, a discharge groove formed in the bottom of the cleaning box, a water outlet pipe rotatably arranged on the partition plate, a plurality of water outlets formed in the water outlet pipe, and a cleaning cylinder rotatably arranged outside the water outlet pipe. The cleaning machine for improving food quality and safety can brush and classify food materials, the food materials are located between two groups of cleaning brushes with opposite rotation directions, the cleaning effect of the food materials is better, and the edible safety of food is ensured. The collection grooves with different heights can realize the screening of the food materials after cleaning, and effectively improve the quality and the quality of subsequent food material processing.

The utility model discloses a device for flotation of coal slime by using coal gangue, which relates to the technical field of coal slime and comprises a feeding frame arranged on a support plate and fixedly connected with the support plate; the discharging pipe is arranged on the supporting frame and fixedly connected with the supporting frame; the liquid inlet pipe is fixedly connected with the supporting frame; the number of the crushing components is two, and the two crushing components are symmetrically arranged on the supporting frame and used for crushing coal gangue; the screening part is arranged in the supporting frame and is used for screening the crushed coal gangue; the vibrating mechanism is arranged on the supporting frame; the flotation mechanism is arranged on the discharging pipe and used for conducting flotation on the coal slime; the screening component and the vibrating mechanism are arranged, so that the crushed coal gangue is screened, and incomplete decomposition of coal slime in the large-particle coal gangue is avoided; and by arranging the crushing device and the flotation mechanism, flotation of coal slime in the coal gangue is achieved.

The invention discloses a noise reduction method and system for an element distribution diagram and a related device, and relates to the field of image processing, and the method comprises the steps: carrying out the surface scanning of a to-be-detected sample through an X-ray energy dispersive spectrometer, obtaining the image data of the element distribution diagram of the to-be-detected sample, and obtaining the image data of the element distribution diagram of the to-be-detected sample, including the X-ray energy spectrum of each pixel point; the similarity between the pixel points is determined based on the X-ray energy spectrum of each pixel point and a preset component number, each pixel point in the image data is classified according to the similarity, a plurality of component distribution diagrams are obtained, and each component corresponds to one category of the pixel point; and in response to a selection operation of a user, determining at least one active ingredient distribution diagram from the plurality of ingredient distribution diagrams, and regenerating the element distribution diagram based on the at least one active ingredient distribution diagram. According to the invention, decomposition and price reduction are carried out on the element distribution diagram, distinguishing and screening of effective components and noise components in the element distribution diagram are realized, and the element distribution diagram is regenerated to realize noise reduction of the element distribution diagram.

The invention belongs to the technical field of wheat breeding, and relates to a molecular marker for detecting haplotype of an aegilops tauschii sourced stripe rust resistant gene Yr28 and application of the molecular marker. According to the invention, a dCAPS marker is designed according to the base difference between the AetAY614Dv1G0004900.1 gene of aegilops tauschii AY61 and the 18th site of a CDS region in the Yr28 allele of aegilops tauschii PI511383, and the marker can effectively identify different haplotypes of the Yr28 gene in the aegilops tauschii germplasm resources. In addition, a KASP marker is developed on the basis of the base difference between the new haplotype of the stripe rust resistance gene Yr28 in the aegilops tauschii AY61 and the TraesAK58CH4D01G004400.1 gene of common wheat AK58, the introgression line genotype created by the common wheat and the aegilops tauschii AY61 can be efficiently identified, and identification and screening of disease-resistant single plants in hybridization or backcross derivative populations are achieved.

The invention belongs to the technical field of poultry breeding, and particularly relates to a Zhou chicken molecular breeding method based on a growth performance related SNP (Single Nucleotide Polymorphism) marker. In order to solve the problems of low efficiency and insufficient accuracy of existing breeding of the Zhou chickens, the method comprises the following steps: determining growth performance indexes of the Zhou chickens, collecting samples, extracting high-quality genome DNA, screening specific core SNP markers significantly related to the growth performance, constructing a joint detection system, screening dominant genotype individuals based on the system, and establishing a core group; a new strain with stable and improved growth performance is obtained through multi-generation breeding, and finally the effect is verified through a control test. According to the method, conversion from phenotype screening to genotype precise screening is achieved, the breeding precision and efficiency are improved, the breeding period is shortened, the weight of the bred new strain 70 days old is increased by 10% or above, the feed-gain ratio is reduced by 8% or above, the breeding cost can be reduced, the industrialization value of the Zhou chickens is improved, and the method has good industrial practicability.

The utility model relates to the technical field of agricultural engineering, and discloses dustless feed crushing equipment which comprises a tank body, a first motor is arranged at the top of the tank body, the output end of the first motor is fixedly connected with a deflection disc, and the outer side of the deflection disc is slidably connected with a swing frame. A plurality of first swing columns are rotatably connected to the outer side of the swing frame at equal intervals, second swing columns are rotatably connected to the bottoms of the first swing columns, limiting plates are arranged at the bottoms of the first swing columns, supporting rods are rotatably connected to the tops of the limiting plates at equal intervals, and springs are arranged on the outer sides of the supporting rods. According to the dust collection device, the second swing column is driven to swing synchronously, the limiting plate plays a role in limiting, the supporting rod and the spring play a role in fixing, multi-angle dust collection of the interior of the tank body is achieved through the structure, the complexity of a dust collection system is simplified, the load of a dust collection fan is reduced, and then the dust collection efficiency is improved.