751results about How to "No dust" patented technology

The invention relates to an effervescent composition of a water-soluble fertilizer and a preparation method thereof. The effervescent composition contains one or a plurality of plant nutrient substances and one or a plurality of compounds which are contacted with water to generate gas. The effervescent composition comprises an optimized proposal that the plant nutrient substance is monopotassium phosphate. The effervescent composition can be also added with acid, a plant growth conditioner, a surfactant, a filler, a disintegrating agent, an adhesive, dye, a lube and the like. The preparation method comprises the following steps: ingredients are weighed, mixed, pulverized, pelletized and dried to obtain the effervescence composition. The effervescent composition can be manufactured through a routine production process, has rapid disintegrating and dissolving (diffusing) speed in the water, does not block a spray head or drip a pipeline, is uneasy to absorb dampness, has high content of effective compositions, low packaging, storage, metering and using cost and high utilization rate of the effective compositions, reduces waste and pollution to environment, is widely applied to economic crops, gardening, lawns and urban landscaping and has wide market application prospect.

The invention discloses a composition of a color high-concentration mono-color master batch for polyolefin. Carrier resin is polyolefin resin, and the polyolefin resin comprises metallocene polyolefin resin. The composition further comprises a toner and an additive, wherein the additive comprises a dispersing agent, a lubricating agent, a coupling agent, a compatilizer and a stabilizer, or a mixture of at least two of the dispersing agent, the lubricating agent, the coupling agent, the compatilizer and the stabilizer. The metallocene polyolefin resin is introduced for serving as carrier resin, and the toner and the conventional additive are added, so that the color high-concentration mono-color master batch is obtained. The mono-color master batch can be directly added during production of a polyolefin product, and different types of color high-concentration mono-color master batches can be matched and toned freely according to the color requirements of products, so that the dependence of toning and color control on a color master batch manufacturer is lowered greatly. The color high-concentration mono-color master batch has high dispersivity, is free from dust, and does not pollute production environments.

A process for preparing the agglomerate cat sand includes such steps as mixing attapulgite clay, sodium hydroxide, magnesium oxide, anhydrous gypsum and high-hydroscopicity resin, stirring, extruding, drying in air, grinding, granulating, drying and sieving. Its advantages are fast adsorption of odor and suppressing growth of bacteria.

The invention discloses a multi-element nitralloy material and a preparation method and application thereof and belongs to the technical field of alloy material development. The multi-element nitralloy material comprises 9-48% of V, 13-45% of Si, 0.05-9% of Mn, 3.3-14% of Fe, 15-30.5% of N, 0.01-5.0% of Cr, 0.06-2.0% of Al, 0-7.0% of Ti, 0-6.5% of B, 0-4.5% of Nb, 0-1.8% of C, 0-0.1% of P, and 0-0.1% of S. According to the multi-element nitralloy material and the preparation method and application thereof, the content of nitrogen in the alloy can be effectively controlled to be within a reasonable range according to different combining capacities of various elements and the nitrogen; meanwhile, the content of the nitrogen can be adjusted within a wider range according to requirements of practical purposes, and great convenience is provided for a molten steel microalloying reinforcing technique; safety and environmental friendliness are achieved in the preparation and using process, and no smoke or dust or odor is generated.

The invention discloses a method and a device for reducing and roasting manganese dioxide into manganese monoxide in electrolytic manganese industry. The method comprises the following steps: dried manganese dioxide mineral powder is ground, well mixed with reducing powder and conveyed to a feeding bin on the top of a roasting furnace, and then enters hermetic roasting devices; a plurality of burners are arranged among the hermetic roasting devices; fuel is burnt so as to roast manganese dioxide ore; the manganese dioxide ore and the reducing powder are heated and roasted to 900 to 970 DEG C in the hermetic roasting devices with no oxygen supplement; under the circumstance of oxygen-free contact after reaction in the lower ends in the hermetic roasting devices, the temperature of roasted manganese ore is lowered, so as to recover heat and cool the manganese ore; and finally, the manganese ore is discharged out of a furnace by an automatic discharging device and then is subjected to a subsequent process. The method and the device can reduce and roast the high / low-grade manganese dioxide ore, have the advantages of low production cost, simple process and convenient operation, can control the reduction rate of manganese dioxide and other metals through the automatic discharging device, and improve the quality of final products.

The invention provides a polymer cement waterproof coating. The polymer cement waterproof coating comprises a liquid material and a powder material in a mass ratio of 1: (1.0-2.5), wherein the liquid material comprises the following components in percentage by weight: 85-95wt% of polymer emulsion, 0.5-1.0wt% of a defoaming agent, 0.02-0.1wt% of a preservative and 4-14wt% of water; the powder material comprises the following components in percentage by weight: 30-50wt% of cement, 39-50wt% of quartz sand, 10-20wt% of heavy calcium carbonate and 0.05-1.6wt% of a dust suppressant, wherein the dust suppressant is one or more of C2-C8 dihydric alcohol, oligomers of dihydric alcohol and esters of the oligomers of dihydric alcohol and the degrees of polymerization of the oligomers of dihydric alcohol are less than 10. The polymer cement waterproof coating disclosed by the invention has the advantages of good environmental friendliness and good strength and elongation properties and no dust is generated during production, transportation, storage and use of the polymer cement waterproof coating.

The invention discloses a sectional cutting and overall craning method for a supporting beam in deep foundation pit multilayered reinforced concrete. The method comprises the steps of internal force measurement, cutting and dismantling, transferring in the foundation pit, entirely craning of the supporting beam, off-site crushing of the supporting beam and the like. The method is to construct on an underground horizontal thin slab structure without special requirement on the construction platform. A steel pipe supporting system of the underground thin slab structure is not required to be reinforced, but holes and expansion joint positions are reserved for the underground horizontal thin slab to be locally reinforced. When the supporting beam is cut off and dismantled, the steel pipe stand is not required for the lower part. The single input of the steel pipe stand material is greatly reduced on the site, and the steel pipe stand can be dismantled in advance to improve the turnover rate of the steel pipe stand.

The invention discloses pipe straightening, derusting and painting integrated equipment for civil engineering construction. The pipe straightening, derusting and painting integrated equipment for thecivil engineering construction comprises a straightening device, a derusting device and a paint spraying device, wherein the straightening device comprises at least one roller set, each roller set comprises a roller support, an upper roller, a lower roller and a first driving mechanism, the upper rollers and the lower rollers are rotationally arranged on the roller supports, the first driving mechanisms are used for driving the upper rollers or the lower rollers to rotate, the derusting device comprises an annular ring, a derusting brush fixedly arranged on the inner side of the annular ring and a second driving mechanism used for driving the annular ring to rotate, the paint spraying device comprises a spraying gun and a material supplying mechanism used for conveying paint to the spraying gun, and the spraying gun is located on one side in the extending direction of a material guide channel so as to be used for spraying the paint to the surface of a pipe. According to the pipe straightening, derusting and painting integrated equipment, the pipe can be straightened, derusted and sprayed with the paint at a time so that the working efficiency can be effectively improved.

The invention provides a split type air purifier and a filter module of the split type air purifier. A draught fan is arranged on an outdoor case, the filter module is arranged in an indoor case, the outdoor case is provided with a fresh air port, a return air port is independently formed in the position far away from the indoor case rather than being formed in the indoor case, positive pressure and large-range air circulation are formed, and indoor air flows to the outside only through gaps. The purifier further comprises an spherical air port, an adjustable grid plate type fresh air port, a module pressing-down mechanism and a touch screen, the filter module is a combined module capable of being freely combined, an early-effect filter module is made of bag type multi-layer non-woven fabrics, a formaldehyde removing, benzene removing, TVOC removing, degerming and deodorizing filter module is designed by adopting secondary cellular activated carbon, an efficient HEPA filter module is made of efficient H13 and H14 materials by piling multiple layer of Z-shaped folds, the split type air purifier is low in noise and good in dust removing, TVOC removing, degerming, benzene removing, smoke removing and deodorizing effect, the PM2.5 can reach the level of 0.1 micron, the oxygen content of air is high, and the effect of air circulation without dead angles in a room is achieved.

The invention relates to the technical field of glass processing, and especially relates to a glass container fire polishing machine, which solves technical problems in prior arts such as unreasonable design. The fire polishing machine comprises a frame, and a glass container conveyer belt arranged above the frame. The fire polishing machine is characterized in that: plural sets of fire polishing mechanism are arranged on the frame, wherein the fire polishing mechanisms are orderly arranged along the conveyer belt; each fire polishing mechanism is connected to the frame through an adjustable movable mechanism; the fire polishing mechanisms can move along the conveyer belt with the driving of the adjustable movable mechanism; while moving along the conveyer belt, the fire polishing mechanisms can be elevated in a vertical direction with the adjustable movable mechanism. Compared to prior arts, the glass container fire polishing machine has advantages of reasonable design, simple structure, high heat treatment temperature, and high speed. Meanwhile, flaws appeared during glass bottle production processes can also be solved by the machine. The processed glass containers have good surface fineness, no dust, and basically no pollution.

The invention relates to a prefabricated concrete component production system. The prefabricated concrete component production system comprises a reinforcing bar production line for producing reinforcing bars and transversely extending, two prefabricated concrete wall plate production lines for producing prefabricated concrete wall plates and respectively positioned on two sides of the reinforcing bar production line, a fixed table mold production line and an overlapped plate production line respectively used for producing special-shaped components and overlapped plates and positioned on two transverse sides of the two prefabricated concrete wall plate production lines, and a concrete stirring station for providing concrete finished products for the fixed table mold production line, the two prefabricated concrete wall plate production lines and the overlapped plate production line; wherein the two prefabricated concrete wall plate production lines directly take the reinforcing bars from the reinforcing bar production line; and the fixed table mold production line and the overlapped plate production line take the reinforcing bars from the reinforcing bar production line through a second transportation rail crossing over all the production lines. The prefabricated concrete component production system is capable of improving a reinforcing bar and concrete supply mode, and improving the production efficiency.

The invention discloses a method applied to efficient suspension liquid fertilizer containing fulvic acid for lettuce. The suspension liquid fertilizer includes, by weight, 10-25 parts of fulvic acid, 35-50 parts of major element, 1-10 parts of medium element, 0.2-3 parts of trace element, 0-3 parts of functional substance, 3-5 parts of suspended aid, 2-12 parts of a composite chelating agent, 0-1 parts of a defoaming agent, 0-1 parts of solution stabilizer, and a thickener. The preparation method comprises the steps of: adding water, potassium humate, nitrogen fertilizer and potassium fertilizer into a reactor A, and conducting high-speed stirring to prepare a saturated mother liquor; adding water, phosphate fertilizer, trace element material, a dispersing agent, a filler and partial defoaming agent into a reactor B, conducting high-speed stirring and grinding for the formation of a solid-liquid mixture; mixing the saturated mother liquor and solid-liquid the mixture, adding a thickening agent, residual defoaming agent and an anti-freezer, and emulsifying to prepare a suspension liquid fertilizer. The invention has the advantages of high total nutrient content, no layering or deposition, and realization of long distance transportation.

The invention discloses a method for preparing high-purity bulleyaconitine A. The method comprises the following steps of: soaking a fresh radix aconiti agrestis root in acid aqueous solution, performing homogenate extraction and cavitation mixing solid-liquid extraction, collecting and concentrating the filtrate, and respectively performing gradient elution to obtain a crude bulleyaconitine A product through ion exchange resin column chromatography and macroporous adsorption resin column chromatography; and uniformly mixing crude bulleyaconitine A product and ethanol aqueous solution, dissolving in a water bath, cooling the filtrate to room temperature, standing and crystallizing at the temperature of 4 DEG C, repeatedly washing the crystal by using the ethanol aqueous solution, and obtaining a final product. According to the method, crushing and extracting are finished in one step through a homogenization method, and the method has the advantages of zero dust and simple flow. By adoption of a negative-pressure cavitation extraction technology, the mass transfer rate is improved, heating is not required, and the production period is shortened; and moreover, the reagents used in the whole process are ethanol and water, the organic solvent amount is greatly reduced, the production cost can be reduced, the environmental pollution is reduced, and the method has good application prospect.

The invention provides a key technology of deep processing of alum-free handmade sweet potato vermicelli or purple sweet potato vermicelli, relating to a manufacturing technology of bean vermicelli. The deep processing method comprises the following technological processes of taking a starch material, preparing gravy paste, blending and kneading the powder, vacuumizing, leaking filaments and molding, cooking and pasting, cooling and fishing the vermicelli out, freezing, unfreezing and drying, and then packaging the vermicelli. According to the deep processing method, a production process of firstly molding and then cooking thoroughly is adopted; excellent starch of 100% of pure sweet potato or purple sweet potato is adopted; any pigment edible glue, alaum or additive is not added; the produced bean vermicelli is soft and smooth in mouthfeel, is not broken or agglomerated, and does not contain dust and sand, and the retention time can be up to be over two years.

The invention discloses an automatic case unpacking machine which comprises a machine frame. A conveying system is arranged in the middle of the machine frame and comprises a front conveying system body and a rear conveying system body. The portion, between the front conveying system body and the rear conveying system body, of the machine frame is provided with a jacking belt mechanism. The front end of the jacking belt mechanism is provided with a stopper capable of being lifted. The jacking belt mechanism is provided with a first belt conveying mechanism. The portions, located on the left side and the right side of the jacking belt mechanism, of the machine frame are provided with side pressure clamping devices. An upper locating mechanism is arranged above the jacking belt mechanism. The bottom face of the upper locating mechanism is provided with a vacuum sucker. Four stand columns are arranged on the machine frame and are connected through four linear motion die sets to form a frame-shaped linear motion support. Each linear motion die set is provided with a cutting head. Each cutting head is driven by one alternating current servo motor to do linear motion on the respective linear motion die set. The automatic case unpacking machine is reasonable in design, simple in structure, easy to implement and convenient to use.

A technology for industrially preparing the natural cocoon wool sheet includes choosing cocoon, immersing in warm water, adding caustic soda in the water tank of beating machine, heating the water to80 deg.C, cyclically scalding the cocoon by hot water while pulling silks while removing pupa to become cocoon wool sheet, rinsing in clean water at 90 deg.C for 4-5 hr, flushing, dewatering, baking and packing. A method for in-situ processing the natural silk quilt is also disclosed.

The invention discloses a type of construction slurry for rotary pile drilling. The slurry is a type of compound slurry comprising water, bentonite, hydroxypropyl methyl cellulose solution, clay and soda ash. The construction slurry provided by the present invention can be widely applied in fields of well drilling, rotary pile drilling, and underground diaphragm wall. During a preparing process, the slurry can be mixed quickly and well. The slurry also has advantages of high efficiency, low pollution, low energy consumption and low cost.

The invention discloses a pyraclostrobin aqueous suspension agent and a preparation method of the pyraclostrobin aqueous suspension agent. The pyraclostrobin aqueous suspension agent comprises the following ingredients in percentage by weight: 1 to 50 percent of pyraclostrobin, 1 to 8 percent of dispersing agents, 1 to 10 percent of wetting agents, 0.1 to 2 percent of thickening stabilizers, 1 to 10 percent of antifreezing agents, 0.1 to 1 percent of defoaming agents, 0.1 to 0.5 percent of preservatives and the balance of de-ionized water. Except the thickening stabilizers, the materials are subjected to stirring and sand grinding, then, the thickening stabilizers are added, the stirring is carried out, and in addition, a proper number of pH regulating agents are added. The pyraclostrobin aqueous suspension agent and the preparation method have the advantages that the flashing point is high, non-flammable and non-explosive performance is realized, the production, the storage and the use are safe, the environment pollution is low, the product cost is low, the package is easy, and the like.

The invention discloses a spraying material for a coal mine underground roadway and a preparation method of the spraying material. The problems that existing spraying materials are poor in cohesiveness, high in rebound and easy to crack, lots of the materials drop on the ground, and functions of seepage prevention, water leakage prevention, gas leakage prevention and the like are not fulfilled aresolved. The spraying material and the preparation method thereof are provided. According to the spraying material for a coal mine, an inorganic composite material is adopted, various advantages of anorganic material and an inorganic material are combined, the optimal proportion of raw material components is analyzed by an orthogonal test method, the spraying speed and the spraying quality are greatly increased, the working environment is improved, meanwhile, the cost is reduced, and good economic benefits and social benefits are obtained.

The invention discloses a novel carbon fiber composite electric heating film which comprises a conductive carbon fiber layer, wherein the conductive carbon fiber layer is of a meshy structure weaved by carbon fibers, two ends of the conductive carbon fiber layer are connected with metal electrodes, and the conductive carbon fiber layer is entirely cladded by an insulated heat conduction plastic film to form a laminated structure. The carbon fiber electric heating film provided by the invention is resistant of high temperature and not easy to oxidize; and the outer-layer heat conduction plastic of the carbon fiber electric heating film is an insulated material and can resist high temperature of 300 DEG C and high voltage; and therefore, the carbon fiber electric heating film provided by the invention has extremely high safety and can be guaranteed to be used for over 50 years. The carbon fibers supply heat to the external environment in an infrared irradiation mode, is free of dust, noise, wastes and waste gases and is basically free of electromagnetic irradiation. The invention has the advantages of concise preparation process, low cost, energy source saving and eco-environmental protection and accords with the environment protection and energy source development directions.

The production process can produce double wall corrugated pipe of hard polyvinyl chloride and in the caliber up to 800 mm and the corrugated pipe is used for conveying liquid or solid material and protecting under ground wires. The production process includes the following steps: preparing materials including PVC resin, composite stabilizer, stearic acid, PE wax, chlorinated polyethylene and calcium carbonate; kneading the materials in a high speed kneading machine for 12-16 min, stirring in low speed cold mixer at 115-125 deg.c, extruding in a double screw extruder at 90-210 deg.c, setting and drawing in a blowing and sucking molding formation machine, cutting and flaring.

The invention discloses a preparation method of a liquid plant dye, comprising the following steps of: firstly selecting plant materials, crushing, then adding fermenting strain and alcohol solution for fermentation, extracting the obtained solution, reducing pressure, concentrating, distilling, preparing dye concentrated solution, adding an auxiliary agent in the dye concentrated solution and preparing liquid dye. The invention has rich resource of utilized plants and simple preparation method, and does not cause pollution of chemical synthetic dye to the environment in the preparation process; the prepared dye has natural and elegant color, does not have hazardous effect on human body, is applied to clean production in the textile industry and can be produced in large scale; and based on the traditional process, the invention adopts modern means and improves the extraction process so as to facilitate the storage and transportation.

The invention relates to a method for preparing white carbon black by utilizing waste silicon rubber cracked residues. The method comprises the following steps of: crushing cracked residues, and calcining at high temperature; adding calcined ash residues, a certain amount of solid sodium hydroxide and water into a alkali-soluble reactor for reacting, and filtering to an obtain sodium silicate solution serving as filtrate; adding deionized water and a surfactant into a sol-gel reactor, and dripping an aqueous solution of sodium silicate and hydrochloric acid to obtain white carbon black, and washing, filtering, performing azeotropic dehydration with n-butyl alcohol and drying to obtain the white carbon black. According to the method, organic wastes in the residues are calcined at the high temperature to perform aerobic degradation reaction, so that toxic and harmful substances in the wastes are oxidized and pyrolyzed at the high temperature to be damaged; the superfine white carbon black is prepared from the calcined substances by the sol-gel technology; and the white carbon black has the advantages of high whiteness, small partical sizes, narrow particle size distribution, high flowability and the like, and the application range of the recycled products is broadened.

The invention belongs to the technical field of pipe processing equipment, in particular to a programmable high speed automatic pipe cutting machine. A controller and a belt pulley mounting frame are arranged on a rack, two groups of belt pulleys are horizontally arranged on a same side of the belt pulley mounting frame and driven by a stepping motor respectively, the two groups of belt pulleys are arranged up and down and respectively provided with synchronous belts with adjustable center distances, guide cylinders capable of passing through braided pipes are arranged at the two ends of the two synchronous belts respectively, a color code sensor for detecting shear color code is arranged on the inner side of a first guide cylinder, a braided pipe cutting mechanism is arranged on the outer side of the first guide cylinder, a photoelectric sensor for detecting storage allowance of the braided pipes is arranged on the outer side of a second guide cylinder, signals detected by the color code sensor and the photoelectric sensor are sent to the controller, and the controller controls the rotating degree of the stepping motor and movement of cutting mechanism cutting the braided pipes according to procedures. The programmable high speed automatic pipe cutting machine has the advantages of being high in automation degree and control function, low in cost, high in accuracy and the like.

The invention relates to an optical probe with a blower for an infrared thermodetector. The optical probe is characterized in that: an objective lens (101) and a transmission fiber (102) or an infrared sensor and a connecting wire thereof (102) are arranged in a tubular probe (100); a sealing protective window (103) is formed at the most front end of the tubular probe (100), and a film which reflects visible light and can be transmitted by infrared work spectrum is plated on the back of the protective window (103); the protective window is obliquely arranged in a blower (200); a high-pressure airflow can blow the surface of the protective window (103) through a pipeline (202) and an air duct (201) of the blower (200), and blows out through a minor-caliber peep tube (300) of which an ash leakage groove (301) is formed on the front end; the tubular probe (100) and the air duct (202) are straight parallel hard tubes, pass through two holes on an assembly flange (400), can flexibly adjust the distance with a target, and can be clamped and fixed by the assembly flange (400); the tail end of the hard tube of the tubular probe (100) is provided with a fiber connector (105) for externally connecting an extended armored fiber, or provided with a cable connector (105) for externally connecting an extended armored signal cable; and the tail end of the hard air duct (202) is provided with an air duct connector (203) for externally connecting an air feed pipeline.

The invention discloses a wall and floor shoveling machine. The wall and floor shoveling machine comprises a shell, two handles, a dust-free depth regulating cover, a water spraying device and a tool. The two handles are arranged on the upper portion of the shell and provided with control switches respectively, the water spraying device is arranged on the outer side of the dust-free depth regulating cover, and the dust-free depth regulating cover is mounted at the bottom of the shell and comprises a cover body and two symmetrical depth regulating devices. The tool is mounted in the middle of the cover and comprises a disc tool seat, and tool bits are uniformly distributed on an outer arc surface of the disc tool seat. The wall and floor shoveling machine is functionally versatile, stable in operation and free of dust raising, grinding depth can be regulated according to construction requirements, and water can be directly sprayed to wet walls and floors to soften putty, so that dust reduction can be realized. In addition, the wall and floor shoveling machine is simple, convenient and quick in operation and clean, flat and smooth in ground surfaces.

The invention discloses high-efficiency deep desulfurization active carbon and a preparation method thereof, belonging to the field of modified active carbon materials. The high-efficiency deep desulfurization active carbon is prepared through the steps of by adopting coal or a coconut shell as raw materials, crushing, screening, then adding a coal tar adhesive for extrusion forming, and calcining at 750-950 DEG C to form primary active carbon; carrying out dipping treatment on the primary active carbon, uniformly loading a hydroxide active agent and a cyclodextrin assistant active agent, carrying out secondary high-temperature calcination in the presence of excessive heat water vapors to obtain a high-efficiency desulfurization active carbon product. The active carbon prepared through the method disclosed by the invention has the advantages of high sulphur capacity, high desulfurization speed, long usage period, high strength, good abrasion resistance, good material permeability, no dust and the like, can not only be used for the large-scale deep desulfurization and purification of petrochemical products such as fuel oil, natural gas, gas, liquid hydrocarbon and synthetic ammonia, but also be used for the fields of pharmaceutical gas sterilization, solution filtration and purification, solvent recovery, water purification, gas purification and the like.

The invention discloses a mining spraying material formula which is characterized in that: the spraying material comprises a solid material and a liquid material; the solid material comprises the following components: cement, fly ash, a water reducer, an accelerating agent, and fibers; the liquid material comprises at least one of acrylic acid emulsion (pure acrylic acid, styrene acrylate, modified building styrene acrylate, butylbenzene) or 801 glue; the mass ratio of the solid material to the liquid material is 100:3-10; the spraying material formula of the invention is suitable for rapid construction, has no dust or springback during construction, is green, environment-friendly, material-saving, and good in flexibility, is not liable to cracking, does not flake to hurt people even if cracking occurs, and is high in safety and reliability.

The invention discloses a full-automatic numerical control sander which comprises a base frame, a top cover, a working table and an electronic control system. The working table comprises a support base board, a rotary disc and a sanding mechanism, wherein the rotary disc and the sanding mechanism are installed on the support base board, an accessory clamp is arranged on the surface of the rotary disc, and the sanding mechanism is arranged to be a gantry structure based on a Cartesian rectangular coordinate system. The electronic control system comprises a movement controller. According to the full-automatic numerical control sander, the movement controller is utilized to preset machining process of accessories, the sander is controlled to automatically conduct polishing, sanding and machining, manual operation is replaced, labor intensity of workers and production cost are reduced, production efficiency is improved, machining accuracy is high, consistency of products is good, and quality of the products can be improved. A variable frequency motor is matched with a high-performance frequency converter, high-speed and silent operation can be achieved, the polishing and the sanding of the accessories are conducted on a top cover, a blowing cleaning mechanism is matched with a sanding head to automatically clean, production conditions (free of noise or dust) can be improved, and safety of workers is ensured.