376results about How to "Solve the problem of dust" patented technology

The invention relates to an environmental-friendly dust-free calcium-zinc composite heat stabilizer for PVC processing, which comprises the following components: 20 to 80 percent of metallic soap of main stabilizer, 10 to 60 percent of auxiliary stabilizer and 5 to 30 percent of lubricant. The invention also provides a preparation method of the heat stabilizer. The environmental-friendly dust-free calcium-zinc composite heat stabilizer has the advantages of meeting the requirements for environmental protection, along with excellent thermal stability, low cost of production and use, high efficiency and innocuity.

The invention discloses an alkali-free and chlorine-free liquid concrete accelerating agent as well as a preparation method and an application thereof. The product disclosed by the invention comprises the following components in parts by weight: 34-41 parts of aluminum salt, 0-5 parts of inorganic acid, 2-10 parts of organic alcohol, 0.2-2 parts of alcohol amine, 0.2-2 parts of coordination agentand 9-59 parts of water. The alkali-free and chlorine-free liquid concrete accelerating agent disclosed by the invention plays an important role in engineering such as sprayed concrete and sprayed mortar of various wells, tunnels, culverts, supports and other underground engineering, concrete emergency repair engineering, anchoring, sealing and plugging engineering and the like, and has wide application prospects.

The embodiment of the invention discloses a wavelength converter and a light-emitting device. The wavelength converter comprises a wavelength conversion layer for receiving exciting light and producing excited light, a driving device for driving the wavelength conversion layer to make periodical motion, a box for sealing the wavelength conversion layer and the driving device and comprising a first area for transmitting the exciting light to the wavelength conversion layer and a second area for transmitting the excited light, (and) an external fan arranged outside the box and used for cooling the box, and / or an external radiator arranged on the external surface of the box. According to the embodiment of the invention, the dustproof and radiating of a color wheel in the prior art are realized.

The invention discloses a speed regulation method for a fan. Wherein, acquiring the lowest and highest rotation speed of fan as well as opposite chip temperature to determine the variation relation between speed and temperature; when need, obtaining current chip temperature to determine fan rotation speed according to said relation. It also discloses a fan combination, which comprises a single board with chip, a heat sink on chip, a fan fixed on said sink, and a temperature sensor on said board. This invention not only solves heat dissipation problem of board well, but also overcomes the noise and dust difficulty.

The floor sweeping machine includes floor brush, universal joint, operating rod, battery seat, handle, brush and dust collecting bin. The floor brush is connected via the universal joint tot rod, and has rotary brushes installed to the peripheral of its bottom and connected via bevel gear seats on two ends for rotation and dust collecting bin set in the middle of its bottom. The brushes rotate from outside to inside to collect the dust on floor to the middle dust collecting bin without flying, and the dust collecting bin is easy to take off for cleaning before reuse.

The invention relates to a ventilation and package method of a fuel cell galvanic pile, which comprises a closed package frame. All components of the fuel cell galvanic pile are packaged in the package frame; a ventilation opening is arranged on one surface of the panel of the closed package frame; the ventilation opening is connected with the air blower outlet of the air supplying device of the fuel cell galvanic pile; an air outlet is arranged on the other surface of the panel of the closed package frame; the air outlet is provided with a hydrogen detector which can detect the concentration of the hydrogen inside the closed package frame of the fuel cell galvanic pile. Compared with the prior art, the invention has the advantages that the structure is simple, dust and water can be effectively prevented, the hydrogen concentration can be timely detected, and hydrogen discharging treatment can be timely performed, thereby the explosion caused by the leakage of the hydrogen in the fuel cell galvanic pile can be effectively prevented.

The invention discloses a method for electrochemically strengthening desorption and seepage of coal gas, belonging to the field of coal bed gas extraction and coal electrochemical modification technologies. The method is characterized in that a coal body temperature is raised through changing electricity, chemistry, mineralogy and petrography characteristics of coal and fracture and pore structures of coal under the combined action of an external electric field and an electrolyte to generate gases, reduce activation energy and decrease adsorption potential so as to strengthen the desorption and the seepage of the coal gas, thus the gas extraction efficiency of coal beds is increased. In the method, holes are drilled in a heading or working face and electrodes are arranged in the holes, the external electric field is an alternating-current electric field or direct-current electric field, and the electrolyte is an alkali electrolyte. Compared with the traditional method for increasing the gas extraction efficiency of the coal beds, the method has the advantage that the gas extraction efficiency of the coal beds is increased by 10-30 percent through the electrochemical strengthening.

The invention discloses a transformer substation indoor environment safety intelligent control system which comprises an environment control system as well as a fresh air system, an automatic discharging sub-system, a flame-proof sub-system, a safety early-warning system and a plurality of sensors which are mounted in a transformer substation and connected with the environment control system. The system has the functions of remote communication and monitoring; and in an age that more transformer substations are in unmanned management, by using the system, relevant people can query the environment information of the corresponding transformer substation easier and more conveniently, and receive a warning signal of various abnormal conditions immediately and make the corresponding treatment in time.

The invention discloses a feeding device for a horizontal planetary ball mill, which comprises a revolution turntable provided with a material passage, wherein a feeding zone is arranged in the revolution turntable, the outer wall surface of the revolution turntable is provided with an opening and a feed pipe which is fixed on a stander and is inserted into the opening at certain angle, and the upper end of the feed pipe is provided with a material hopper; the revolution turntable is provided with a hollow shaft corresponding to each planetary mill barrel respectively, one end of the hollow shaft is connected with the end of the planetary mill barrel and moves along with the end part, while the other end is supported on the inner lateral wall of the revolution turntable through a bearing; and a large fan blade and an arc chute are arranged in the material passage on the revolution turntable, and an internal spiral feeder is arranged in the hollow shaft. Because the discharge area of the hollow shaft is large, the hollow shaft can transport materials of which the particle diameter is less than 80 millimeters and the particle size distribution is uneven; and simultaneously, under the action of a fan with the large fan blade, the air can be transported into the planetary mill barrel, and the problem of material leakage and dust raising on the peripheries of the revolution turntable and a planetary mill main shaft, thus the feeding device has longer service cycle and is more simply to replace and maintain.

The invention belongs to the technical field of lithium industry, and particularly relates to a method for extracting lithium carbonate from low-grade lithium mica. The method comprises the steps of mixing the low-grade lithium mica with a calcination agent, a fluorine-fixing acid-removing agent, a molding hardening agent and a high-temperature plasticizer, adopting an industrial block molding machine for building materials and the like to mold the mixed materials, putting the molded materials into a tunnel kiln for calcination, and then obtaining the lithium carbonate product after ball milling, leaching, purifying and impurity removal, carbonation and lithium settling, washing and drying. By means of the method, the lithium carbonate can be obtained from the low-grade lithium mica in a large-scale and industrialized mode, wherein the overall recovery rate is high.

The invention relates to a method for preparing an aerogel plastic film. The method comprises the following steps: S1, preparing aerogel powder slurry, namely sufficiently mixing aerogel powder, an interfacial agent, a functional additive and a solvent to obtain the aerogel powder slurry; S2, preparing a mixture, namely uniformly mixing the aerogel powder slurry and a resin material into mixing equipment to obtain the mixture; and S3, molding the film, namely preparing the film from the mixture by a molding process, which is the aerogel plastic film. The aerogel plastic film has the beneficial effects that, different from conventional in-situ compounding, a step for gelling a reinforcing material with aerogel precursor does not exist, the process is simple without a great number of chemical equipment or site limitation, can conveniently realize large-scale production. The method can be used for preparing the aerogel plastic film, which is a novel product mode to meet the requirement of the prior art for ultrathin aerogel materials.

The invention discloses a high speed electric main shaft used for carpentry, which comprises a main shaft, a stator and a rotor. The front extension end of the main shaft is provided with two front rake touch ball bearings (3, 6). An inner ring spacer (4) and an outer ring spacer (5) are arranged between the two front rake touch ball bearings (3, 6). The rear extension end of the main shaft is provided with two bottom rake touch ball bearings (7, 10). An inner ring spacer (8) and an outer ring spacer (9) are arranged between the two bottom rake touch ball bearings (7, 10). The utility model adopts the structure, and the extension ends of the main shaft can receive radial force, axial force and rigidity, the utility model can also be dustproof, and meets the requirement of present numerical control wood processors. Accordingly, the field of application of the high speed electric main shaft used for carpentry is widened; and the service life of the high speed electric main shaft used for carpentry is increased.

This invention relates to a method for changing the unblocked cabinet adopted in traditional computer and its server into locked one to prevent harm dust does to computer, characterized in adopting present ceramic semiconductor refrigerator to supply cold source for blocked cabinet, temperature of cabinet used in computer and its server being controlled in the range of from 25Deg.C to 30Deg.C under the effect of controlling temperature circuit to make the computer and its server safely and stably work in clean environment and suitable temperature.

The invention discloses a median type tailing damming method utilizing mold bags. The median type tailing damming method has the advantages that the grouted mold bags 7 are piled up to build a downstream dam body 2, the downstream dam body 2 is kept clean and smooth by the sand consolidation effect of the mold bags 7, and the environmental problems such as dust flying, gullying and coarse sand loss are solved well; tailing pulp with the content of tailing particles, smaller than 0.05mm in size, not larger than 40% (by weight) is taken as mold bag filling pulp for the mold bags 7, so that the particle size range of tailing sand available for damming is widened, sand quantity available for the median type tailing damming method is increased, water drainage of the mold bags 7 can be accelerated, solidification can be speeded up, and grouting efficiency of the mold bags 7 is improved; in addition, the action of gravity is fully utilized for grouting, and the mold bags 7 can be grouted by multiple branch ore drawing pipes 92 at the same time, so that cost and energy consumption are reduced, and damming efficiency is improved.

The invention provides a water-pressure blasting demolition technology for a box bridge. A spider web type explosive bag is hung in the box bridge, water is injected into the box bridge, and then water-pressure blasting is performed. The water-pressure blasting demolition technology for the box bridge has few application examples in domestic blasting demolition and is applied to unequal-wall-thickness bridge structures for the first time. The technological achievements of environment-friendly water-pressure blasting of the box bridge provide reference bases for future similar projects, the technological achievements of water-pressure blasting demolition of the box bridge structure are achieved, and the technological development of the blasting industry of China is promoted.

The invention discloses a road dust depressor and a preparation method thereof. The road dust depressor is prepared from 0.5-10% of petroleum asphalt, 5-20% of glycerol, 1-5% of anhydrous calcium acetate, 0.5-5% of a surfactant, 1-5% of a cosolvent, 1-2% of sodium metasilicate and 55%-90% of water. The preparation method includes: at room temperature, adding deionized water into a reaction kettle, starting stirring and conducting heating to 50DEG C, adding anhydrous calcium acetate in batches, after complete dissolving, adding glycerol, after dissolving, adding the surfactant, road asphalt, the co-solvent and sodium metasilicate in order, performing stirring dissolving to a homogeneous phase so as to obtain a brown-black brown aqueous solution, and carrying out standing, cooling and filling, thus obtaining a finished product. The road dust depressor has good moisture retention, moisture absorption and adhesion, and has remarkable dust suppression effect and long dust suppression period. The product is safe to use, has no corrosion to metal, is non-toxic, can be biodegradable, has no influence to vegetation, is an environment friendly product, and can be widely applied to dust control of unpaved roads, urban asphalt pavement, strip mine roads and the like.

The invention discloses a novel seal box type scraper conveyor and belongs to the technical field of conveyors. By means of the novel seal box type scraper conveyor, the high-viscosity high-temperature powder-shaped material is avoided from hardening, bonding and dust in conveying. The novel seal box type scraper conveyor comprises a headstock, a head wheel component, a tail frame, a tail wheel component, a scraper chain, a regulating chain, a single-layer transportation intermediate tank, support legs, connecting bolts, a drive device, a single-layer transportation intermediate tank with a hole, and a flat plate gate; the head wheel component is connected with a left rack and a right rack through connecting bolts, after a closing plate A and a closing plate B are placed in side rack slots, each of a left press beam and a right press beam is fixed through connecting bolts; a left climb passage, a right climb passage and a transitional arc plate are fixed at the arc-shaped transition position of the inner side of a transition rack through countersunk bolts; a cover board and a rubber sealing strip are fixed with the side racks and the transition rack through connecting bolts. The novel seal box type scraper conveyor is mainly used for conveyors.

The invention relates to a method for producing an automotive sound-absorption and heat-insulation integrated carpet and belongs to the technical field of automotive interior decorations. In the method, an environmentally-friendly 3.5 millimeter (including 0.8 millimeters of a toughening layer, 2.5 millimeters of a foaming layer and 0.2 millimeter of a bottom film protective layer) PVC foamed leather is mainly used and subjected to heating, baking, vacuum forming, cooling forming, 8 millimeter cotton-based sound-absorption and heat-insulation carpet compression and lamination, shearing, hole making, punching and inspection to produce a finished product. The method solves and improves the indexes, such as sound absorption, heat insulation, dust prevention, attractive appearance and easy cleaning, of the automotive carpet and makes the automotive carpet reach international advanced level-III and meet the design requirements on environmental protection, attractive appearance, comfortableness, sound absorption and heat insulation of an automotive cab. In a plastic absorption process, a pneumatic pre-feeding device is used to ensure the thickness of the foamed leather on the highly-stretched part of the large section of the product, so the overall quality of the product is improved, the quality consistency of the product is guaranteed, the production efficiency is improved greatly and the labor intensity is relieved greatly. The compression and lamination of the sound-absorption and heat-insulation carpet improve the sound and heat insulation performance of the product and make the appearance of the product smooth and elegant and touch comfortable. In the while production process of the product, no harmful matter is produced, and the product is an environmentally-friendly product.

The invention provides a water-retention and water-permeable brick and a preparation method thereof. The water-retention and water-permeable brick is prepared by adopting a specific amount of cement, a stone stock, a gelling agent, a coloring dispersant and water. The water-retention and water-permeable brick has the advantages of low cost, high compression strength, high breaking strength, water-retention and water-permeable functions and the like, wherein the stone stock can be selected from waste exploited stones, so that not only can comprehensive utilization of the waste stones be realized but also the ecological environment is cleaned, and particularly the problem of dust raising caused by deposition of a large amount of stone chips is solved. The preparation method of the water-retention and water-permeable brick is simple in process, does not need kilning, has a significant energy conservation and emission reduction effect, has a low manufacturing cost and significant social and economic benefits, is reasonable in process design, is simple and convenient in manufacturing, generates no secondary pollution, and is suitable for large-scale production.

The invention aims to provide an efficient and energy-saving 3D printing method of luminous words. The 3D printing method of the luminous words includes the technical steps that 1, a drawing is designed and a model is made; 2, a luminous word panel is carved; 3, a vertical wall and a lamp panel are printed; 4, a light source is pasted; and 5, assembling is performed. The method has the beneficial effects of being high in printing precision and printing speed, easy to operate, nontoxic, dustfree, environment-friendly, efficient, capable of saving cost and the like. The obtained luminous words are easy to assemble and disassemble and convenient to maintain later, have flexible and varied patterns and styles and have a wider application range. The demands of various occasions can be met by matching colors of the words at will.

The present invention relates to angular contact bearing, and is one self-lubricating angular contact ball bearing for application in high temperature, heavy load and corrosive condition. The bearing includes rolling body, inner bearing ring and outer bearing ring, the rolling body is made of silicon nitride ceramic balls, and the inner bearing ring and the outer bearing ring are made of stainless steel. The rolling body is fully filled with balls with contact angle greater than 36 deg, and double-side dust cap is mounted between the inner bearing ring and the outer bearing ring. The present invention is self-lubricated, has high hardness, no holder and good dust preventing performance. The present invention is used mainly in butterfly valve of absolute pressure regulator in aeronautic and astronautic fields, and may be also used in field with corrosive medium, such as in chemical industry, navigation, etc.

The invention discloses a multifunctional air purifier. The multifunctional air purifier comprises an outer shell, a purifying and refrigerating system and a water system, wherein the purifying and refrigerating system and the water system are arranged in the outer shell, the purifying and refrigerating system is of a paper honeycomb structure, the water system comprises a water tank, a circulating water pump and a water pipe, the circulating water pump is located in the water tank and communicated with the water pipe, the water pipe is located above the purifying and refrigerating system, and a water spray opening is formed in the water pipe. The purifying and refrigerating system is made of special material of the paper honeycomb structure, in this way, under the action of gravity, water flows from top to bottom, a water film is formed on the surfaces of corrugated fibers, when flowing air passes through the purifying and refrigerating system, the water in the water film will absorb bacteria, viruses, dust and heat in the air and take away the bacteria, the viruses, the dust and latent heat in quantity to achieve the purposes of purification, cooling, humidification and oxygen generation, and the multifunctional air purifier refreshes indoor air, eliminates static electricity and radiation, refreshes a user and improves disease resistance of the human body.

The invention belongs to the technical field of air conditioners, and specifically provides an indoor unit of an air conditioner. The indoor unit of the air conditioner aims at solving the problem that due to the fact that an existing indoor unit is poor in structural design, the air supply experience and the air supply cleanliness are easily affected. For this, the indoor unit of the air conditioner comprises a machine shell, an air guide plate and a multifunctional plate, wherein an air inlet port is formed in the top of the machine shell, an air outlet port is formed in the front lower portion of the machine shell, the air guide plate is arranged at the air outlet port, and the multifunctional plate comprises a connecting plate, and an air scattering plate and an air baffle which are connected with the connecting plate; the connecting plate is connected to a left end cover and / or a right end cover of the machine shell in a pivoted mode, a plurality of air scattering holes are formed in the air scattering plate, the air scattering plate and the air baffle can move to a position close to the air outlet port alternatively, and the air scattering plate is arranged to be capable of scattering air outlet airflow when moving to a position close to the air outlet port; and the air baffle is arranged to be capable of being matched with the air guide plate to carry out air outlet drainage so as to avoid direct blowing when moving to a position close to the air outlet port, and capable of carrying out dust prevention when moving to the air inlet port, so that the comfort degree and cleanliness of air supply are effectively improved.

The invention discloses a sweeping vehicle and belongs to the field of the sweeping vehicle. The sweeping vehicle comprises a loading chassis, a lateral brush lifting mechanism, a main brush lifting mechanism and a dust collecting mechanism, wherein lateral brushes are respectively arranged on the two sides of the front part of the loading chassis; the lateral brushes are connected with the lateral brush lifting mechanism; the lateral brushes are driven to rotate by a lateral brush motor; the main brush lifting mechanism is arranged on the middle part of the loading chassis; a main brush is connected with the main brush lifting mechanism; a main brush motor is used for driving the main brush to rotate through a belt wheel; the dust collecting mechanism is arranged at the top at the rear end of the loading chassis. The main brush and the lateral brushes are arranged on the sweeping vehicle disclosed by the invention; the garbage is gathered toward the main brush by the lateral brushes and then is swept into a dust collecting box by the main brush; the garbage is firstly gathered in the cleaning process of the sweeping vehicle, so that the cleaning effect is better than that of a common sweeping vehicle; the dust collecting mechanism of the sweeping vehicle is used for treating the fine dust and the fine dust is absorbed into the dust collecting box in the cleaning process, so that the problem of heavy dust in the cleaning process of the present sweeping vehicle can be solved.

The invention discloses an unpowered automatic air purifier comprising a dust suction box. The upper portion of the dust suction box is communicated with a purification filtration system which is connected with an unpowered fan. The unpowered fan continuously operates, so that dust in the air is filtered by the purification filtration system, and the dust and PM2.5 in the air are removed effectively. In addition, a multistage filter screen in the purification filtration system can be cleaned or replaced to keep effective air filtration. An anion air purifier or ozone generator is added to the purification filtration system, and air purification is further improved.

The invention relates to a batten type automatic overturning back cleaning blackboard which is mainly composed of a board surface, a frame around the board surface and a power input mechanism. The board surface is composed of a plurality of horizontally arranged battens, mutually buckled protrusions or grooves are arranged at the positions of contact surfaces of the adjacent battens, and the frame is composed of a static frame, side frames and a movable frame. Board surface renewal mechanisms are arranged in two side frames respectively, sliding bodies are arranged at two ends of the movable frame, mandrels are arranged at two ends of the battens respectively, and the sliding bodies and the mandrels are respectively connected with the board surface renewal mechanisms. First driving bodies are arranged in the two side frames respectively, are driven by the power input mechanism and are connected with the board surface renewal mechanisms. By driving the movable frame and the plurality of horizontally arranged battens through the first driving bodies in the two side frames, separation of the movable frame, the battens and the static frame is achieved, then the battens are overturned for 180 degrees, integrated press fit is performed finally, cleaning of the back side is finished while normal teaching use of the visual board surface is achieved, and accordingly the problems which occur in blackboard use at present are solved.

The invention discloses a granularity-adjustable laying hen feed and a preparation method thereof and belongs to the technical field of feed processing. The preparation method of the laying hen feed mainly comprises the following steps: taking corns as the main raw materials of the laying hen feed; grinding the corns by a double-roller grinder; screening the grinded corns by a vibration sieve; further grinding the screen residues by a hammer grinder; uniformly mixing the further grinded screen residues with the screened grinded corns; grinding soybean meal, DDGS, corn bran, double-low vegetable meal, monosodium glutamate protein and palm meal by a hammer grinder; then preparing the laying hen feed according to the conventional method. Preferably, the ratio of the digestible amino acids in the laying hen feed is DLys: (DM plus C): DThr: DVal: DArg equals 100: 84: 67: 87: 94; moreover, the yeast powder fermented from the preserved bacteria Rhodotorula benthica WYN1 whose preservation code is CCTC No: M 2014592 is specially added in the laying hen feed; thus, the grinding time is shortened, the dust is reduced, the production efficiency is improved, the breeding effect is raised and the egg quality is improved.

The invention discloses an environment-friendly linear motion ship loader, comprising a portal frame, an upright post, a rotary table, a cantilever crane, a telescopic slip cylinder, a belt conveyor, a counterweight frame, an anti-dust device and a cart travelling mechanism, wherein the telescopic slip cylinder is of a dustproof dual-layer sleeve structure, and is composed of a main pipe and a dust suction pipe; a material flow passes through the inside of the main pipe; the dust suction pipe is arranged on the main pipe in a sleeving manner; the anti-dust device comprises a dust collecting pipeline, a material storage tank and a negative pressure fan; a slip cylinder dust collecting opening is formed in the top of the telescopic slip cylinder, and is connected with the dust collecting pipeline; a material transfer opening of the belt conveyer is provided with a dust cover; a dust collecting opening of the dust cover is formed in the dust cover, and is connected with the dust collecting pipeline; the dust collecting pipeline is communicated with the material storage tank, and the negative pressure fan is arranged by matching with the material storage tank. The environment-friendly linear motion ship loader not only can be suitable for loading and unloading of powdery materials, but also is environment-friendly; and materials are not wasted.

The invention discloses a maintenance-free active heat radiating system applied to an LED (Light Emitting Diode) lamp, and the system provided by the invention has the advantage of good heat radiating effect and basically does not have dust. In the maintenance-free active heat radiating system disclosed by the invention, a cyclone accelerator, an air filter, a cyclone dust shunt and a dust collector are arranged at the lower end of a hollow lamp post; the air inlet of the cyclone dust shunt is connected with outside air; after the air passes through the rotary channel of the cyclone dust shunt, large-grain dust is deposited into the dust collector by vrtue of a rotary acceleration; then, the clean air enters the middle channel of the cyclone dust shunt and is blown into the air filter and the cyclone accelerator; a heat radiator is arranged on an LED lighting assembly at the upper end of the lamp post; a through hole is drilled on the heat radiator; a fixed pipe and a heat radiating sheet are arranged at the upper face of the heat radiator; after the air supplied by the cyclone accelerator at the lower end in the lamp post enters the fixed pipe connected with the lamp post from an inner hole at the upper end of the lamp post, the air passes through the through hole through a vent pipe arranged at the other end of the fixed pipe and is blown into the air inlet of an air increaser through the other end of the through hole; and the air outlet of the air increaser is aligned with the heat radiating sheet to blow the air. The maintenance-free active heat radiating system disclosed by the invention has the advantage of good heat radiating effect and basically does not have dust.

Provided is a dust collection device for a building site. The main content is that the device comprises nozzles, a hoop, a pressure resistant rubber water hose, a steel pipe, a rotating joint, nozzle supports, a ball valve, a pressure gauge, a multistage centrifugal pump, a motor, a water filter, a water tank, an elbow, a copper bush, an O-shaped seal ring, a straight pipe, a lock nut, and a stop screw. The device uses a tower crane on the building site to fix a pipeline on the standard knot of the tower crane. The pipeline is connected with a spray boom on the revolving support center of the tower crane through the rotating joint. The spray boom is fixed on a tower crane arm rack. The spray boom is uniformly provided with a plurality of nozzles. The nozzle supports are fixedly installed on the spray boom. The nozzles are fixed on the nozzle supports. Thus, the water of the multistage centrifugal pump can be sent to high altitude of tens of meters and even hundreds of meters, and through rotation of the tower crane, effect of large-area spraying and dust setting is achieved. The device is low in cost and easy in maintenance, and solves a problem of dusts of the building site.