72results about How to "Improve blocking efficiency" patented technology

The invention relates to the technical field of manufacturing of fiber composite membranes, particularly a preparation method of a multilayer-structure nano fiber composite membrane for filtering particulates in air. The preparation method comprises the following steps: (1) sequentially spinning a first nano fiber membrane layer to nth nano fiber membrane layer onto a matrix by electrostatic spinning, wherein n is a whole number ranging from 1 to 50; (2) covering a nano fiber membrane protective layer on the upper surface of the nth nano fiber membrane layer and the exposed surfaces of all the nano fiber membrane layers to obtain a semifinished product; and (3) compounding the semifinished product to obtain the product. The method can enhance the uniformity and mechanical properties of the filter membrane, and can also enhance the barrier efficiency of the filter membrane for particulates and relatively lower the air drag.

The invention discloses a sewer sewage purification apparatus. The apparatus comprises a sewage treatment machine, a power chamber is arranged in the sewage treatment machine, and a power device is arranged in the power chamber. The apparatus can complete a set of workflow comprising screening, filtering, crushing and transportation of garbage in sewage, so the working time is greatly saved, and the working efficiency is improved; large garbage is continuously pushed out, so blockage caused by long-term accumulation is avoided, and the blocking efficiency is increased; the apparatus cuts the large garbage in a stirring manner to facilitate the transportation after the garbage treatment and solve the problems of inconvenient transportation and low transportation efficiency of the large garbage with various types and uneven sizes; blockage and filtration are simultaneously carried out, so the overall working efficiency is improved; and multiple functions can be achieved by using a singlemotor, so the cost of the apparatus is reduced, and energy is saved.

A filled composition for radiation shielding includes at least one polymer ingredient and at least one metal-containing filler. The at least one polymer ingredient is selected from the group consisting of a polyolefin elastomer, a polyolefin co-polymer, a polyolefin ter-polymer, and a combination thereof. The polyolefin elastomer, the polyolefin co-polymer, or the polyolefin ter-polymer includes monomer units derived from ethylene and at least one vinyl monomer having more than three carbon atoms. The at least one metal-containing filler is selected from a metal filler, a metal compound or a combination thereof.

The invention discloses a process system for producing exquisite sand by adopting a machine-made sand vertical mill. The process system comprises a raw material cabin, the machine-made sand vertical mill, a combined powder concentrator, a vibrating screen, a cyclone and a circulating fan, wherein the raw material cabin, the machine-made sand vertical mill and the combined powder concentrator are sequentially connected; a bottom discharging opening of the combined powder concentrator is connected with the vibrating screen; the vibrating screen returns oversize products to the machine-made sandvertical mill; the air outlet of the combined powder concentrator is connected with the cyclone; the air outlet of the cyclone is connected with the circulating fan; a plurality of layers of screens with different pore diameters are arranged on the vibrating screen; a pre-screening device is arranged between the machine-made sand vertical mill and the combined powder concentrator; the process system further comprises a machine-made sand blending system for blending sand out of the combined powder concentrator and the vibrating screen; and the machine-made sand blending system comprises a weighing device, a mixing device, a conveying device and a storing device. The process system can realize high-quality machine-made sand production, can produce the machine-made sand meeting any fineness modulus requirement, meets different product demands and realizes multiple functions of a production system.

An insect / dust-proof air shutter which can positively prevent intrusion of foreign mater such as insects and dust and further trap intruded insects is provided. The air shutter 1 has side casings 2, 3 between which a passage space S is formed through which an inside space of a room is communicated to an outside space, the side casing 2 has an air suction openings 21 and an air discharge opening 22 proximate horizontally to one another and opening toward the passage space S, the side casing 3 has an air suction opening 31 and an air discharge opening 32 proximate horizontally to one another and opening toward the passage space S, the suction openings 21, 31 face the discharge openings 32, 31 respectively across the passage space S, air passages 23, 24 are formed in each of the side casings 2, 3, air sucked through each of the suction openings 21, 31 is reversed in flow direction horizontally by 180 degrees in each of the air passages 23, 24 to be blown out from each of the discharge openings 22, 32, and air streams blown out from the discharge openings and sucked through the suction openings form circulating air streams flowing laterally across the passage space thereby forming double air films covering the passage space S.

The invention provides a network risk blocking method based on attack graph and co-evolution. The method comprises the steps of 1, scan that network environment with a vulnerability scanning tool to obtain network vulnerable point information, configuration information and topology information, generating an attack graph by using the three kinds of information, and define a plurality of risk measurement attributes and a calculation method of attribute values of each node in the attack graph; 2, according to the calculation method of each risk measurement attribute value, obtaining the data setof each node's risk measurement attribute value in the attack graph, and determining the weight of each risk measurement attribute according to the entropy value method; 3, weighting and fusing the data sets of the risk measurement attribute values of each node to obtain the comprehensive value of the risk measurement attribute values of each node; Fourthly, the comprehensive value of each node 's risk measurement attribute is used as the input of the co-evolutionary algorithm, and the risk evaluation value of each node set is obtained through the initial population determination, fitness function calculation, individual selection, cross-operation and mutation operation, and the network blocking path is evaluated accordingly.

The invention discloses a method to prepare coking dirty depressant and application, which is characterized by the following: it compounds with constitutional formula as formula (1); R1 and R2 is C1-C12 hydrocarbyl group; n is intact number at 2-6; M is elements of Ce, La, SnSb, Al, Bi, In or Mo; A is elements of O or S. This product possesses merits of good effect, good stability, wide range of temperature A and simple producing craft.

The invention discloses a production process system for producing multi-product machine-made sand. The production process system comprises a raw material bin, a machine-made sand vertical mill, a combined-type powder concentrator, a vibrating screen, a cyclone and a circulating fan, wherein the raw material bin, the machine-made sand vertical mill and the combined-type powder concentrator are connected in sequence, a bottom discharging port of the combined-type powder concentrator is connected with the vibrating screen, the vibrating screen returns oversize products to the machine-made sand vertical mill, an air outlet of the combined-type powder concentrator is connected with the cyclone, and an air outlet of the cyclone is connected with the circulating fan; and a plurality layers of screens with different pore sizes are arranged on the vibrating screen. The cone angle of each grinding roller of the machine-made sand vertical mill is not larger than 20 degrees, and the total projection area of the grinding rollers on a grinding disc accounts for 20-35% of the area of the grinding disc. A retention ring is a cut-through screening and retention assembly or a cross-type retention ring, auxiliary discharging assemblies arranged on the grinding disc and are located behind each grinding roller in the rotation direction of the grinding disc. By means of the process system, production of the multi-product machine-made sand can be achieved, and scale production is facilitated; and meanwhile, the effect of environmental protection is better, and ultraclean discharge can be achieved.

The invention relates to a flexible barrier net and a design method thereof. The flexible barrier net includes main components such as a supporting column, a supporting rope and a metal flexible net.The supporting column is formed by a supporting column main body and a supporting column base. The supporting rope includes a longitudinal supporting rope, a top supporting rope, an intermediate supporting rope and a diagonal supporting rope connected between the supporting column and the metal flexible net. The lower part of the metal flexible net is arranged obliquely downstream of a slope; themetal flexible net is in a relaxed state when not impacted, the position of the bottom of the metal flexible net is fixed through a short anchor rod, and the bottom of the metal flexible net has redundancy and is folded in the upstream direction or embedded inside a slope body. The flexible barrier net is reasonable in structure, and the strength of loose rock and earth mass can be fully used to block moving rock and earth mass and systematically reduce the structural internal force.

The invention discloses electronic equipment, and a file partitioning method applied to the same. The method is applied to the electronic equipment, and comprises the following steps of receiving a file modification operation; obtaining a file partitioning range corresponding to the file modification operation according to the file modification operation and a first partitioning result; obtaining a first file partitioning instruction; carrying out a first partitioning operation on data in the file partitioning range according to the first file partitioning instruction to generate a second partitioning result; when obtaining a file synchronization instruction, transmitting the changed file block according to the second partitioning result. By utilizing a partitioning history result, after a file is modified, the file partitioning range corresponding to the file modification operation can be obtained, and only the data in the file portioning range is re-partitioned, so that the file partitioning time is shortened, the file partitioning efficiency is improved, and the amount of data transmitted when the file is synchronized is reduced.

This invention discloses a kind of burnt hinder and preparing and application, it is that a kind of structure general formula is the chemical composition of the type (l): R1 and R2 are the alkyl of hydrogen or C1- C20 respectively in the type, R3 and R4 are the alkyl of hydrogen or C1- C12 respectively, and R4 and R3 can't be the hydrogen while, n is the integer of 2-6, A is S or O atom. The invention offer burnt hinder for petroleum refining and petrochemical industry processing course, in order to prevent, delay and dispel the equipment and pipeline to accumulate the dirt burnt or knot effectively.

The invention discloses a dry-hang type block forming machine. The machine comprises a frame, a forming mechanism and a material distributing mechanism, wherein the forming mechanism and the materialdistributing mechanism are arranged on the frame; the forming mechanism comprises an upper die fixing frame, an upper die plate, a pressing head at the lower end of the upper die plate, a die frame, alower die plate, a supporting plate, a base plate, a base and lifting mechanisms which are arranged at two sides and are used for driving the die frame to ascend and descend, wherein the upper die fixing frame, the upper die plate, the pressing head, the die frame, the lower die plate, the supporting plate, the base plate, the base and the lifting mechanisms are sequentially arranged in the forming frame from top to bottom; and the material distributing mechanism comprises a material distributing frame, the material distributing frame is provided with a driving chamber and a material distributing chamber through a partition plate, a motor mounting plate is arranged on the driving chamber, a motor is arranged on the motor mounting plate, a plurality of material distributing holes are formed in the material distributing chamber through a plurality of material blocking plates, spiral blades are arranged in the material distributing holes, and the spiral blades are in transmission connection with a driving shaft through driving of the motor. According to the machine, the structure is arranged, so that the compactness of the product is improved, material distributing can be more uniform, the energy consumption of the whole machine can be low, and the block forming efficiency can be improved.

The invention discloses a flue dust remover for a biomass energy boiler. The flue dust remover comprise a housing arranged in a flue, wherein an air inlet and an air outlet are formed in the housing; multiple rows of dust boards are arranged in the housing in a smoke flossing direction; through holes are formed in the dust boards in longitudinal and transverse directions in an interlacing manner, and the two adjacent dust boards are arranged in an through hole interlacing arrangement manner. The flue dust remover for the biomass energy boiler utilizes an optimized structure to form a stereo S-shaped smoke flowing channel in two directions, thereby improving the blocking efficiency. The flue dust remover for the biomass energy boiler has the advantages of simple structure, easiness in manufacturing, convenience in use and long service life.

It is intended to provide a method of conveniently screening a novel protein or a novel partial sequence protein having a blocking ability based on amino acid sequence data; and a protein achieving an improved blocking efficiency that can be expressed on a large scale in Escherichia coli. A method of screening a novel protein or a novel partial sequence protein having a blocking ability based on amino acid sequence data; a protein characterized by achieving an improved blocking efficiency owing to an amino acid sequence modification; and a method of utilizing the protein.

The invention provides a track car stopper, comprising a sliding chute and at least one sliding car stopping portion. The sliding car stopping portion comprises a sliding portion and a car stopping portion. The sliding portion comprises a sliding block and a push-pull portion; the sliding block is arranged in the sliding chute in a sliding manner; one end of the push-pull portion is fixed to the end of the sliding block, and the other end of the push-pull portion can be arranged in at least steel rail of a track in a penetrating manner; the car stopping portion is fixed to the top of the sliding block; the car stopping portion can be clamped on the steel rail under the state that the push-pull portion is arranged in the steel rail in a penetrating manner. The track car stopper is easy in operation, a car can be stopped and allowed to run through simple push and pull movements, the car stopping effect is obvious, the personal safety of operators can be guaranteed and accidents are avoided happening.

The present invention discloses a star block copolymer and a preparation method thereof. The method comprises that: (1) in the presence of a diluent, isomonoolefin contacts an initiator system, and a cationic polymerization reaction is performed to obtain the polymerization system of the poly isomonoolefin with the terminal having reaction activity; and (2) when the conversion rate of the isomonoolefin achieves more than 60%, the polymerization system and a styrene-containing solution are mixed, and a cationic polymerization reaction is performed, wherein the initiator system contains at least a compound capable of providing carbenium ion, titanium tetrachloride and at least an activator, and the activator is selected from a compound represented by a formula I-1 and a compound represented by a formula I-2. According to the present invention, with the method, in the case of assurance of the high molecular weights of each block, the generation of the styrene homopolymer and the di or hypercopolymer can be significantly reduced so as to effectively improve the block efficiency. The formulas I-1 and I-2 are defined in the specification.

The invention discloses a method and a system for preventing call harassment of a call center. The method for preventing call harassment of the call center comprises the following steps: setting a first white list according to an IP of a legal call source of the call center; obtaining current call data, wherein the current call data comprises a current call source IP and a call frequency of the current call source IP; judging whether the current call source IP belongs to the IP in the first white list or not; if yes, judging whether the calling frequency of the current calling source IP exceeds a first frequency threshold value or not; if so, stopping the call and the message from the current call source IP; thus illegal calls can be effectively intercepted by judging the IP of the call source, and meanwhile, all messages of the illegal call source can be prevented through the IP layer by judging the call frequency of the call source, so that harassment calls are prevented, improper occupation of voice resources is avoided, and the resource utilization efficiency is improved.

The invention relates to the technical field of lifting dams, and discloses a stable hydraulic lifting dam with a locking mechanism. The lifting dam comprises a base; a plurality of gates are arrangedon the upper surface of the base in parallel; a pressure relief opening is formed in the middle of each gate; a blocking plate is mounted in the middle of each gate and located on the inner side of the corresponding pressure relief opening; two main hydraulic rods are correspondingly installed on the rear surface of each gate and located on two sides of the corresponding pressure relief opening;two second lock rods are correspondingly arranged on one side edge of the rear surface of each gate and lock seats are installed on the other side edge of the rear surface of the corresponding gate and correspond to the second lock rods; and two first lock rods are installed on the side, close to the corresponding main hydraulic rods, of the rear surface of each gate. The stability of the gates isimproved, the pressure load and the tension load borne by the gates can also be improved, the second lock rods and the lock seats are used in cooperation, the blocking efficiency of the gates is high, the plurality of independent gates can be connected in series into a whole, the gates can also be rapidly formed into individual wholes, operation is easy and convenient, and implementation is convenient.

The invention discloses a production process system for preparing machine-made sand through a vertical mill. The production process system comprises a raw material bin, the machine-made sand verticalmill, a combined powder concentrator, a vibrating screen, a cyclone barrel and a circulating fan, wherein an outlet of the raw material bin is connected with a material inlet of the machine-made sandvertical mill; a material outlet of the machine-made sand vertical mill is connected with a material inlet of the combined powder concentrator; a bottom discharging port of the combined powder concentrator is connected with the vibrating screen; the vibrating screen returns oversize materials to the machine-made sand vertical mill; an air outlet of the combined powder concentrator is connected with the cyclone barrel; an air outlet of the cyclone barrel is connected with the circulating fan; the conical angle of each grinding roller of the machine-made sand vertical mill is not larger than 20degrees; the total projection area of the grinding rollers on a grinding disc is 20%-35% of the area of the grinding disc; a material blocking ring is a through type screening material blocking assembly or a crossing type material blocking ring; and an auxiliary discharging assembly is arranged on the grinding disc and positioned behind each grinding roller in the rotating direction of the grinding disc. The process system is simple in procedure, beneficial to large-scale production and better in environment-friendly effect, and ultra-clean emission can be achieved.

The invention discloses a long-acting sealing agent for blocking high-angle cracks and a preparation method. The sealing agent is composed of hydrogenated butadiene-acrylonitrile rubber, phenolic resin, polyvinyl chloride resin, a plasticizer, an enhancer, a density regulator, a reinforcing agent, a vulcanizing agent, a scorch retarder and an anti-aging agent. The material comprises the followingcomponents in percentage by weight: 33-42% of the hydrogenated butadiene-acrylonitrile rubber, 24-35% of the phenolic resin, 13-22% of the polyvinyl chloride resin, 3-8% of the plasticizer, 2-6% of the enhancer, 1-5% of the density regulator, 1-3% of the reinforcing agent, 1-3% of the vulcanizing agent, 0.2-1% of the scorch retarder and 0.2-0.8% of the anti-aging agent. The method is used for thewestern marginal thrust zone fault block oil reservoir of the Erdos basin; according to the long-acting sealing agent for sealing the high-angle cracks, the long-acting sealing agent can be used for solidifying the high-angle cracks or faults with different opening degrees in a stratum, and the problems of fracturing fluid filtration loss and out-of-control crack height caused by natural crack orfault penetration which cannot be solved by a conventional method are solved.

The invention discloses a large-scale remote sensing image block distribution method, and belongs to the field of remote sensing image processing. The method comprises the following steps: reading metadata information of a large remote sensing image; inputting image blocking parameters; performing logic partitioning to obtain a plurality of blocking areas and start and stop row and column numbersof each blocking area; reading data of the whole remote sensing image into a memory; assigning a port number, constructing a TCP server, and waiting for the connection of the client; for each connected client, taking out a data area corresponding to the current block from the memory according to a blocking sequence, and sending current block data to the client; and after all the data blocks are sent completely, closing the TCP server. According to the method, only the data is logically partitioned in the memory, and the partitioned data is not stored in the hard disk, so that the blocking efficiency of the data can be greatly improved.

The invention provides a GaN-based LED epitaxial structure, a preparation method thereof and a light emitting diode, relates to the technical field of semiconductors, the GaN-based LED epitaxial structure comprises a substrate, an n-type doped layer, a quantum well active layer, an electron blocking layer and a p-type doped layer which are sequentially arranged from bottom to top, wherein the n-type doped layer is formed on the substrate, the quantum well active layer is formed on the n-type doped layer, the electron blocking layer is formed on the quantum well active layer, the p-type doped layer is formed on the electron blocking layer, and the polarity of the p-type doped layer is opposite to that of the electron blocking layer. High-density net polarization negative charges exist at the interface of the polarity of the p-type doping layer and the electron blocking layer; therefore, the conduction band energy level of the electron blocking layer is induced to be raised to be higher,a higher barrier is generated to block electron leakage, meanwhile, the blocking barrier of hole injection is reduced, the electron blocking efficiency and the hole injection efficiency are improved,and thus the light emitting efficiency of the light emitting diode is improved.

The invention discloses a blocking control system and method based on a wireless cheating signal, and the system comprises N pieces of blocking equipment, a network switch, detection equipment, and anantenna. The detection equipment is connected with the network switch and the antenna. The detection equipment is used for carrying out the feature analysis of a signal obtained by the antenna, and transmitting a first control instruction to the N pieces of blocking equipment through the network switch when there is a suspected signal. The N pieces of blocking equipment are connected with the network switch. The blocking equipment is used for generating an interference signal of the suspected signal according to the first control instruction, and transmitting the interference signal. According to the embodiment of the invention, the system can intelligently adjust the radiation power according to the environment spectrum information, and solves a problem that the excessively high transmission power of pressing equipment causes the excessively large impact on the health of a human body and an excessively large management and control range.

The invention discloses interleukin-17 (IL-17) receptor antagonist which is characterized in that: the antagonist is peptide; the amino acid sequence of the peptide comprises a sequence with the number being SEQ ID No. 1 and the sequence with the number being SEQ ID No. 2 which are connected through a flexible connecting sequence; and the connecting order is sequentially the SEQ ID No. 1 sequence, the connecting sequence and the SEQ ID No. 2 sequence from a nitrogen end to a carbon end. According to the invention, IL-17RA PLAD and IgG Fc sections with the specificity existing in the IL-17 receptor form soluble fusion protein, are connected by flexible connecting protein Linker, do not affect the secondary structure of the protein, and can be separated and purified targeting at Ig. Consequently, the IL-17RAPLAD is closed, and the oligosaccharide of the receptor is suppressed. The interleukin-17 (IL-17) receptor antagonist has the advantages of high specificity, high blocking efficiency and the like.

The invention provides a rotary blind rivet which comprises a core rod and a sleeve body. A head protruding body is arranged at one end of the core rod. A broken neck groove is formed in the middle of the core rod. A first thread section is arranged on the outer surface of the core rod from the broken neck groove to the head protruding body. A second thread section is arranged from the broken neck groove to the tail portion of the core rod. The core rod can be sleeved with the sleeve body. A sleeve body thread section which can be engaged with the first thread section is arranged in the sleeve body. The first thread section is partially or completely engaged with the sleeve body thread section. At least one annealing section is further arranged on the sleeve body. After the core rod is sleeved with the sleeve body, the annealing section is located between the broken neck groove and the head protruding body of the core rod. The thread of the first thread section is different from that of the second thread section. According to the rotary blind rivet, the structure integration degree is high, the number of parts is small, the installation reliability is high, and the requirements for safety of aerospace vehicles can be better met.

The invention discloses a gas inlet gas-entraining passage structure with a limit compartment length. The structure includes a gas-entraining passage shell and a gas inlet grill, the gas-entraining passage shell includes a grill shell and a gas inlet passage shell fixedly connected to the grill shell, the gas inlet grille is fixed on the surface of one side of the grille shell, a swirl flow separation device for separating gas and impurities is arranged in the gas inlet shell, and the gas inlet grill communicates with the swirl flow separation device through an inner cavity of the grille shelland an inner cavity of the gas inlet shell. The dust-removal and water-removal functions of the gas inlet gas-entraining passage structure with the limit compartment length designed by the inventionare completed by the swirl separation device in a gas-entraining passage, so that the arrangement space required for the gas-entraining passage is reduced, and the length of a compartment can be increased to increase the volume of the compartment; the reasonable design of a gas inlet grille angle increases the blocking efficiency of the gas inlet grille to impurities; the internal structure of thegas-entraining passage is simple, and the gas inlet pressure loss is small; and the overall structure has high efficiency of shunting and removing impurities.

The invention discloses a coke scale inhibitor, its preparation method and application. It is a compound whose general structural formula is formula (1): in the formula, R1 and R2 are hydrocarbon groups of C1 to C12, n is an integer of 2 to 6, and M is Ce, La, Sn, Sb, Al, Bi, In Or Mo element, A is O or S element. The coke scale inhibitor has good coke inhibiting effect, good stability, wide applicable temperature A range and simple production process.

The invention provides an electric meter box switch lock remote signaling device convenient to maintain, wherein the device comprises a box door, a hinge, an electric meter box body, a mounting plate, a lock hole, an infrared sensor, a maintenance port and an ultrasonic sensor; the box door is mounted at a right inlet / outlet of the electric meter box body through the hinge. Through the arrangement of a rainfall sensor, an electric telescopic rod, a U-shaped wheel frame, a wheel shaft, a winding wheel, protective waterproof cloth and a vortex spring, if the rainfall sensor detects that the rainfall is large in a rainy day, the U-shaped wheel frame can be driven to move rightwards through an electric telescopic rod of a remote signaling host, at the moment, the wheel shaft in the U-shaped wheel frame drives the winding wheel to rotate, and the protective waterproof cloth can be pulled out, the equipment can be protected to ensure the protection effect; when rainfall is reduced or rain stops, the U-shaped wheel frame is driven by the electric telescopic rod of the remote signaling host to move leftwards, and due to energy storage and energy release of the vortex spring, the winding wheel can rotate to wind the protective waterproof cloth, so that the operation convenience is guaranteed.

The invention relates to a direct-current bias isolation grounding system based on a capacitor. The grounding system comprises a capacitor C, an isolation switch G1, a discharging damper RL, a high speed eddy current switch K0 and a silicon controlled rectifier SCR. The wire entrance end of the isolation switch G1 is connected with a neutral point of a transformer. The wire exit end of the isolation switch G1 is connected with the wire entrance end of the capacitor C. The wire exit end of the capacitor C is grounded. The silicon controlled rectifier SCR is parallelly connected with the capacitor C. The wire entrance end of the discharging damper RL is connected with the wire entrance end of the capacitor C. The wire exit end of the discharging damper RL is connected with the wire entrance end of the high speed eddy current switch K0. The wire exit end of the high speed eddy current switch K0 is connected with the wire exit end of the capacitor C. The grounding system is quite high in safety and direct current isolation efficiency; effects on an electric power system are quite small; and small impedance grounding of the neutral point of the transformer can be ensured.

The invention relates to the technical field of air quality detection devices, in particular to an air quality detection device and a method thereof. The air quality detection device comprises a base and an air detection device, a lower telescopic rod is installed at the upper end of the base, an upper telescopic rod is installed at the upper end of the lower telescopic rod, an air inlet control device is installed at the upper end of the upper telescopic rod, and a buffer plate is installed on the outer side of the upper end of the air inlet control device; the air detection device is arranged on the outer side of the lower telescopic rod, and the cavity is formed in the middle of the lower end of the air inlet control device, so that the air detection device can be in contact with external air to keep real-time monitoring when the air velocity is normal, after the flow speed of external air is increased, the air inlet control device moves downwards to cover the air detection device, and the two sides of the deceleration channel are arranged in a continuous bending shape, so that the intermittently entering airflow can be in contact with the air detection device only after being fully blocked by the two sides of the deceleration channel, and the effects of reducing the flow speed of the air and improving the detection precision are achieved.