27results about How to "Prevent flocculation" patented technology

The invention relates to the technical field of oilfield exploitation, and discloses a nanometer oil-displacing agent for oilfield oil extraction and a preparation method thereof.The nanometer oil-displacing agent takes modified nanometer silicon dioxide and a surfactant as main components, polymer macromolecules are modified on the surface of the nanometer silicon dioxide to serve as a main body of the nanometer oil-displacing agent, and the nanometer oil-displacing agent is prepared. Under the action of the surfactant, the nano silicon dioxide can flow into the fine throat and the micro throat, and the polymer macromolecules of the branched structure can generate a relatively strong interaction force with the rock, so that the polymer macromolecules are firmly adhered to the surface of the rock, the adhesion of crude oil on the surface of the rock is reduced, a smooth crude oil channel is constructed, and the flowing pressure of liquid is reduced; and crude oil fluidity is improved. The structure of the cross-linking agent contains quaternary ammonium cations, so that the electrostatic repulsion effect between nano silicon dioxide can be greatly enhanced, aggregation between nano silicon dioxide and nano silicon dioxide can be avoided, the interfacial tension can be efficiently maintained, the oil-water interfacial tension is greatly reduced, and the recovery rate of crude oil is effectively increased.

The invention provides a nano imbibition displacement agent suitable for shale oil reservoirs and a preparation method thereof, and the nano imbibition displacement agent comprises the following raw materials in parts by weight: 30-50 parts of sulfonated graphene oxide, 10-15 parts of silane coupling agent modified nano silicon dioxide, 10-20 parts of water-soluble cellulose ether, 10-20 parts of fatty alcohol-polyoxyethylene ether, 5-8 parts of lower alcohol and 50-80 parts of water. Graphene oxide reacts with concentrated nitric acid to prepare acidified graphene oxide, then the acidified graphene oxide reacts with thionyl chloride to prepare acylating-chlorinated graphene oxide, and the acylating-chlorinated graphene oxide reacts with a sodium aminobenzene sulfonate derivative to prepare the graphene oxide. Electrostatic repulsive force is generated among graphene oxide particles through surface sulfonation treatment, the dispersing capacity among the particles is improved, agglomeration and flocculation among the particles are avoided, and the recovery efficiency is improved; sulfonated graphene oxide cooperates with a large-molecular-weight water-soluble cellulose ether surfactant, so that the temperature resistance and the salt resistance of the nano imbibition displacement agent can be remarkably improved.

The invention relates to the technical field of gray water dispersing agents, and discloses an efficient phosphorus-free gray water scale inhibition dispersing agent and a preparation method thereof.The efficient phosphorus-free gray water scale inhibition dispersing agent is characterized in that a green amino acid monomer is adopted for conducting carboxyl end capping on a prepared polyether long-chain monomer containing carboxyl and sulfonic acid groups so as to improve the biodegradability of a macromolecular polyether monomer, and the efficient phosphorus-free gray water scale inhibition dispersing agent is obtained through copolymerization with an acrylic acid monomer; the steric hindrance and hydrophilicity of the dispersing agent are enhanced; carboxyl and sulfonic acid groups of the aspartic acid terminated polyether alkenyl monomer can chelate iron ions, hydrophilic groups such as amino groups and ether groups enable the chelate to be dissolved or suspended in a solution, and the dispersing performance is good; active carboxyl and sulfonic acid groups in a molecular chain are chelated with Ca < 2 + > and Ba < 2 + >, and a polyethylene glycol alkyl long chain enables zwitterions to have a certain mutual repulsive interaction; the scale inhibition dispersant integrates scale inhibition and dispersion functions, is free of phosphorus in a molecular structure, is easy to degrade after being discharged, and belongs to an environment-friendly multifunctional scale inhibition dispersant.

The invention discloses a method for adding rare earth into a low-alloy high-strength steel crystallizer, which belongs to the technical field of application of rare earth in steel, and is mainly characterized in that rare earth is added in a manner of symmetrically feeding rare earth wires on two sides of a slab casting machine single-flow crystallizer by adopting a double-pipe wire feeder at a position which is 1 / 2 of the thickness and is 100mm away from a water gap in the width direction; the rare earth wires are 65% Ce-35% La mixed rare earth wires with the diameter being 2.5 mm and wrapped with iron sheets. According to the method for adding the rare earth into the low-alloy high-strength steel crystallizer, the liquid level of the crystallizer is stable in the whole wire feeding process, the storage amount of the rare earth in the steel is increased, water gap flocculation is avoided, the rare earth is evenly distributed on the whole section of a casting blank, the internal quality of the casting blank is improved, and reference can be provided for development of rare earth steel with the high storage amount of the rare earth.

The invention belongs to the technical field of polyurethane surface spraying materials, and particularly relates to a single-component surface spraying material with low viscosity and high weather resistance as well as a preparation method and application thereof. The single-component low-viscosity high-weather-resistance surface spraying material is prepared from the following raw materials: polyether polyol, isocyanate, reactive pigment, filler, a dispersing agent, a catalyst, an ultraviolet light absorber and an antioxidant. The preparation method of the single-component low-viscosity high-weather-resistance surface spraying material comprises the following steps: adding the dispersing agent into the polyether polyol, uniformly stirring, adding the pigment and the filler, uniformly stirring, dehydrating, adding the isocyanate, the ultraviolet light absorber and the antioxidant, pre-polymerizing, cooling, and adding the catalyst to obtain the single-component low-viscosity high-weather-resistance surface spraying material. The single-component low-viscosity high-weather-resistance surface spraying material has the advantages of being environmentally friendly, low in viscosity, excellent in mechanical property and high in weather resistance, and when the single-component low-viscosity high-weather-resistance surface spraying material is applied to a runway surface spraying layer, construction is easy, the color is attractive, and color fading and fading are not likely to happen; the invention also provides a preparation method thereof.

The invention discloses a brewing method of foaming sake, which is characterized by comprising the following steps: raw material treatment, liquefaction, saccharification, primary adsorption, secondary adsorption, primary sterilization, fermentation, sealed fermentation and secondary sterilization. The liquefaction comprises the following steps: mixing glutinous rice flour, beta-cyclodextrin and water, stirring at room temperature for 20-30 minutes, adding high-temperature-resistant alpha-amylase, and carrying out spray liquefaction; the primary adsorption comprises the following steps: adding activated carbon and beta-cyclodextrin into the saccharification product, stirring for 30-40 minutes at room temperature, then standing for 5-6 hours at room temperature, and filtering; the secondary adsorption comprises the following steps: adding mixed activated carbon into the primary adsorption liquid, stirring for 30-40 minutes at room temperature, then standing for 7-8 hours at room temperature, and filtering. The brewed foaming sake is high in light transmittance, good in taste, rich in fragrance and short in fermentation time, and does not need to be stored at low temperature.

The invention relates to the technical field of automobiles, in particular to an air-inlet grille device and a vehicle. Wherein the outer matching piece is provided with an air inlet, the first grating and the second grating are oppositely arranged on the two sides of the air inlet in the set direction, the first crank and the second crank are both rotationally connected with the outer matching piece, the first grating is installed on the second crank, and the second grating is installed on the first crank. The first driving assembly is used for driving the second crank and driving the first grille to rotate, the second driving assembly is used for driving the first crank and driving the second grille to rotate, when the first grille is located at the first opening position and the second grille is located at the second opening position, the air inlet is opened, and the first grille and the second grille are both located on the outer side of the air inlet. When the first grid is located at the first closing position and the second grid is located at the second closing position, the first grid and the second grid seal the air inlet. The air inlet grille device can increase the air inlet amount, avoid the air flocculation phenomenon, reduce the wind resistance and improve the heat dissipation performance.

The invention relates to the technical field of dispersing agents, in particular to a silicon powder dispersing agent based on natural phenolic compound modification and a preparation method of the silicon powder dispersing agent. According to the dispersing agent, the problems that a large amount of chippings and silicon powder are generated in the cutting process by diamond wire cutting liquid, dispersion is insufficient, the chippings and the silicon powder are prone to being attached to the surface of diamond wires or crystalline silicon, then the chippings and the silicon powder are bonded together, and the cutting precision is reduced are solved, and the prepared silicon powder dispersing agent and the composite dispersing composition are good in dispersing effect and high in dispersing speed; the stability is good.

The invention relates to the field of aluminum nitride materials, and provides a preparation method of high-reliability aluminum nitride applied to an IGBT (Insulated Gate Bipolar Translator), which solves the defects of low bending strength and poor thermal shock resistance of an aluminum nitride substrate in the prior art, and comprises the following preparation steps: (1) pretreating powder; (2) tape casting; (3) discharging glue; (4) sintering; and (5) post-treatment.

The invention discloses a preparation method of an anti-flocculation liquid humic acid water-soluble fertilizer based on a subcritical technology, which comprises the following steps: carrying out preliminary subcritical water treatment on fertilizer raw materials, adding dipotassium phosphate and monopotassium phosphate, carrying out subcritical water treatment again, extracting a nutrient solution, and adding an additive to prepare the liquid humic acid water-soluble fertilizer. Through subcritical water treatment and combination of dipotassium phosphate and monopotassium phosphate, high-valence cations in the humic acid water-soluble fertilizer are removed, the attraction of the cations to negative charges on humic acid colloid can be reduced, and the charge balance of the humic acid water-soluble fertilizer is kept; the defect of flocculation phenomenon in the use process of the humic acid water-soluble fertilizer in the prior art is overcome; according to the humic acid water-soluble fertilizer, the fertilizer raw materials are subjected to subcritical water treatment and temperature adjustment, the fertilizer raw materials are subjected to sufficient micromolecularization and then subjected to passivation of metal ions, and the metal ions can be subjected to more sufficient passivation treatment, so that the flocculation phenomenon of the humic acid water-soluble fertilizer is avoided.

This application discloses a ceramic trademark glaze and its preparation method. The trademark glaze comprises 50-60% low-temperature frit; 5-10% zinc oxide; 20-25% zirconium silicate; 8-12% calcined kaolin; 1-2% sodium carboxymethyl cellulose; 0.5-1.0% sodium tripolyphosphate; and 1-5% pigment. The trademark glaze exhibits excellent printing performance, good thixotropic properties, smooth screen printing, and clear line printing without breaks or ink bleeding; it can print clear lines as narrow as 0.3mm. The firing effect is ideal, with pure and vibrant colors and high contrast with the white base glaze; the glaze surface is smooth and even, with no edge curling. It has strong environmental resistance, high hardness after firing, and is resistant to acids and alkalis, maintaining clarity even in harsh outdoor environments for extended periods. The process is widely adaptable, suitable for application to green or unglazed ceramic bodies, and has good compatibility with conventional electrical porcelain firing processes.

The invention provides black paste for labor protection gloves and a preparation method of the black paste, and belongs to the technical field of preparation of labor protection appliances, an anionic surfactant in the black paste has good permeability, and can accelerate the exchange speed of a solvent and water in the black paste and improve the brightness; the added dispersing agent can avoid flocculation of carbon black particles, stability of the color paste is improved, in addition, the amine value of the color paste is low, and the viscosity cannot be affected under the high-temperature condition; the adopted hydroxyl acrylic acid modified polyurethane contains COOH, OH, benzene ring and other pigment affinity groups, has the advantage of high gloss, and also has certain dispersion and viscosity reduction functions. The black paste provided by the invention is wide in raw material source, low in price, simple in production process and low in cost, and the prepared black paste has the characteristics of high blackness, high brightness, high solid content, low viscosity, low odor and good wear resistance, and has good application prospects and popularization values.

The application discloses a preparation method of a high-strength flexible self-supporting hydrophobic electromagnetic shielding film, which comprises the following steps: weighing a certain amount of carbon titanium-aluminum, slowly adding the carbon titanium-aluminum into a lithium fluoride / hydrochloric acid etching solution, magnetically stirring in a water bath at a certain temperature for a period of time, obtaining an etched carbon titanium-aluminum dispersion liquid, carrying out acid pickling on the carbon titanium-aluminum dispersion liquid by using dilute hydrochloric acid, and then washing the carbon titanium-aluminum dispersion liquid until neutral, so as to obtain multi-layer titanium carbide; carrying out ultrasonic treatment on the multi-layer titanium carbide, so as to obtain few-layer titanium carbide; mixing the prepared few-layer titanium carbide and bacterial cellulose with nano-iron oxide respectively; alternately performing vacuum filtration on the mixed solutions of bacterial cellulose / nano-iron oxide and few-layer titanium carbide / nano-iron oxide; and naturally airing the obtained film at room temperature. Finally, methyltrimethoxysilane is deposited on the surface of the film to form a hydrophobic network. The film prepared by the method has the characteristics of good flexibility, high electromagnetic shielding performance and high mechanical strength.

The present invention relates to a pulp production system and method for household paper, the system comprising a hardwood pulper (1) and a softwood pulper (2); the hardwood pulper (1) is connected to a short fiber resin control agent storage tank (3) on its inlet side, and is sequentially connected to a short fiber tapping pre-pulp tank (4) and a short fiber tapping post-pulp tank (5) on its outlet side; the softwood pulper (2) is sequentially connected to a long fiber tapping pre-pulp tank (6) and a long fiber tapping post-pulp tank (7) on its outlet side, the long fiber tapping post-pulp tank (7) is connected to a mixer (8), the mixer (8) is connected to a long fiber resin control agent storage tank (9) and a clean water storage tank (10); the short fiber tapping post-pulp tank (5) and the long fiber tapping post-pulp tank (7) are connected to a mixing tank (11), and the mixing tank (11) is connected to a pulp tank (12). Compared with the prior art, the present invention can avoid the accumulation of resin and also improve the chemical balance of the entire pulp-water system.

The utility model relates to the technical field of polyaluminum chloride processing, and discloses a polyaluminum chloride storage tank which comprises a tank body, a top cover is connected to the tank body in a threaded mode, a base is fixed to the bottom end of the tank body, a rotating groove is formed in the tank body, a rotating plate is rotatably connected to the interior of the rotating groove, a stirring shaft is fixed to the rotating plate, and the stirring shaft is fixed to the bottom end of the tank body. A screw shaft is in threaded connection with the stirring shaft, a holding button is fixed to the top end of the screw shaft, a motor is fixed in the base, a driving gear ring is fixed to the output end of the motor, an air heater is fixed in the base, an inner rotating pipe is rotationally connected to the end face of the air heater, and an outer fixed pipe is fixed to the surface of the inner rotating pipe; a driven gear ring is fixed to the surface of the outer fixed pipe. According to the polyaluminum chloride storage tank, when liquid polyaluminum chloride is put into the tank body, the liquid polyaluminum chloride is stirred to avoid flocculation of the liquid polyaluminum chloride, and when solid polyaluminum chloride is put into the tank body, solid polyaluminum chloride raw materials are dried to prevent the solid polyaluminum chloride raw materials from being affected with damp and caking.

The present invention is a nanofiber forming device, which is a fully enclosed structure, including an extended flow channel pulp distributor, a flow channel, and an adjustable upper lip plate mechanism connected in sequence; wherein the extended flow channel pulp distributor is a straight-up single-flow channel type, and the flow channel cross-sectional area perpendicular to the slurry flow direction gradually expands from a circular hole at the slurry inlet that is the same as the diameter of the slurry pipe to a rectangular area equal to that near the flow box, so as to ensure that the ultra-low concentration nanofiber slurry forms a stable isobaric distribution along the width direction; the flow channel inlet is rectangular, and the cross-sectional area further suddenly increases, and the height in the flow channel is adjustable; the adjustable upper lip plate mechanism can adjust the displacement, and while realizing local fine-tuning of the lip opening height, it can also make forward and backward translation adjustments. The present invention has a simple structure and is suitable for the formation of ultra-low concentration nanofiber slurry of 0.01%-0.05%. The fully enclosed structure can prevent the nanofibers from contacting the air, thereby avoiding the generation of a large number of bubbles. As the application of nanofibers in this hot field continues to heat up, it will have a huge market prospect.

This invention belongs to the field of waterborne anti-corrosion coating manufacturing technology, specifically relating to highly corrosion-resistant waterborne coatings and their preparation methods. This invention uses waterborne epoxy resin emulsion and waterborne acrylic emulsion as resin matrices, improving the film density of the waterborne coating. In the composite anti-rust pigment, surface-modified graphene and calcium-ion-loaded silica particles are grafted with epoxy groups using KH-560, improving the compatibility of the calcium ion-exchange type anti-rust pigment in the resin matrix. Modified mica iron oxide and surface-modified graphene extend the diffusion path of corrosive media through a layered structure. Potassium silicate helps form an inorganic silicate protective layer and seals the micropores of the coating, improving the coating's shielding performance. The calcium ion-exchange type anti-rust pigment generates a silicate passivation film through calcium ion exchange, reducing the rate of further iron dissolution. The waterborne coating of this invention is suitable for anti-corrosion protection of metal substrates in harsh corrosive environments such as marine salt spray and industrial acids and alkalis.

The invention belongs to the technical field of lithium iron phosphate batteries, and particularly relates to a lithium iron phosphate precursor slurry additive and carbon-coated lithium iron phosphate. The main component polycondensate A is rich in amino groups, hydroxyl groups, benzene rings and other functional groups capable of forming strong intermolecular force with lithium iron phosphate, and can be adsorbed on the surfaces of lithium iron phosphate particles during slurry grinding, at the moment, polyether side chains rich in the polycondensate A form a hydrated protective layer, flocculent precipitation between two lithium iron phosphate particles is prevented, and the lithium iron phosphate particles are prevented from being separated from each other. Therefore, uniform particle size distribution of the lithium iron phosphate is ensured, and the viscosity of the slurry is greatly reduced; the compound component ether amine polymer B can also be strongly adsorbed on the surface of the lithium iron phosphate to assist the main component polycondensate A in reducing the viscosity of the slurry; meanwhile, the compound C is an organic salt, so that the electrostatic repulsion on the surface of the lithium iron phosphate can be enhanced, and outstanding effects on reducing the viscosity of the slurry and shortening the grinding time are achieved.

This invention, entitled "A Camellia Seed Oil Microcapsule Emulsion and Its Preparation Method and Application," belongs to the field of cosmetic technology. The technical problem it aims to solve is the deficiency in existing technologies where camellia seed oil is prone to rancidity, leading to reduced stability and bioavailability of formulations. This invention provides a camellia seed oil microcapsule emulsion system that can slow down the rancidity process, thus achieving a transition from oil-soluble to water-soluble camellia seed oil. The key technical solution is a camellia seed oil microcapsule emulsion, the raw materials of which consist of camellia seed oil, sodium caseinate, chitosan hydrochloride, PE9010, and a solvent.

The invention provides a pet wet food using dairy products and meat products as raw materials and a preparation method of the pet wet food. The preparation method specifically comprises the steps of meat cutting, pulping, emulsifying, enzyme adding, mixing and canning. The lactase is added into the pet wet food formula, so that lactose decomposition is facilitated, and pet absorption is promoted; a mixture of dextran sulfate and mannitol is used as a composite protective agent and interacts with protein, so that denaturation of the protein is effectively inhibited, the system stability is improved, meanwhile, the texture of wet food for pets can be improved, and the palatability and the feed intake rate are enhanced; in addition, the zinc sulfate is added, so that the oral problems of dental plaque and dental calculus can be obviously improved after the pet chews and eats the chewing tablet.

The invention relates to the technical field of pesticide preparation, in particular to modified polyglutamic acid for a pesticide suspending agent and a preparation method thereof.The modified polyglutamic acid is prepared from a microcapsule A, a microcapsule B and a particle additive, and the microcapsule A is prepared from chitosan, gamma-polyglutamic acid and abamectin; the microcapsule B is prepared from gamma-polyglutamic acid, polyvinyl alcohol, nano silicon dioxide and abamectin; the particle additive is prepared from modified polyglutamic acid, sodium dodecyl benzene sulfonate, abamectin and carboxymethyl cellulose; the microcapsule A and the microcapsule B play a slow release role, the action time is prolonged while the pesticide suspending agent can take effect as soon as possible, the particle additive can increase repulsive force among particles and prevent flocculation and aggregation among the particles, the microcapsule A, the microcapsule B and the particle additive are synergistically promoted to jointly improve the performance of the pesticide suspending agent, and the microcapsule has a wide application prospect.

The application discloses a high-strength phosphogypsum roadbed material and a preparation method thereof, and relates to the technical field of roadbed materials.The method first carries out ultrasonic-assisted chelation purification on phosphogypsum, and then generates a magnesium-aluminum layered double hydroxide coating layer on the surface of the phosphogypsum through in-situ reaction, so as to realize deep passivation and stabilization of impurities.Meanwhile, graphene oxide-polymer nanohybrid reinforcing liquid is prepared, and basalt fibers are subjected to mild acid etching activation.Finally, modified phosphogypsum, slag powder, cement, activated fibers and nanohybrid reinforcing liquid and other components are mixed, stirred, pressed and formed according to a specific process and are maintained.The method remarkably improves the strength and structural stability of the phosphogypsum matrix through multi-step collaborative modification, and realizes high-value resource utilization of the phosphogypsum in roadbed engineering.

The invention belongs to the technical field of liquid fertilizers, and discloses an organic water-soluble fertilizer containing humic acid and fulvic acid as well as a preparation method and application of the organic water-soluble fertilizer. The organic water-soluble fertilizer comprises a composite humic acid matrix, urea, monoammonium phosphate, potassium nitrate, polyglutamic acid, triphenylsilanol, nano silicon, a composite microbial inoculant and disodium ethylene diamine tetraacetate by weight, wherein the composite humic acid matrix is prepared by mixing hydrothermal synergistic conversion humic acid and biochemical fulvic acid according to a ratio of (2-4): 1; the preparation method comprises the following steps: dissolving the basic components, chelating and synergistic, compounding and curing, and treating a finished product, wherein the curing temperature is controlled to be 35-40 DEG C in the compounding and curing stage. Short-term adjustment and long-term stability of soil pH can be considered, the flocculation resistance of a system and the survival rate of the microbial inoculum are improved, and when the microbial inoculum is applied to tomato and grape planting, obstacle soil conditions can be improved, crop growth indexes, stress resistance, yield and fruit quality can be improved, and the microbial inoculum is suitable for drought, saline-alkali and continuous cropping obstacle scenes.

The present application relates to the technical field of high polymer emulsion synthesis, and provides a preparation method of a high-flexibility low-temperature application vinyl acetate-ethylene copolymer emulsion and a product thereof, which comprises the following steps: adding initial monomers, vinyl acetate, methyl methacrylate and a surfactant solution into a reactor for pre-emulsification, adding an oxidizing agent to initiate a reaction under an ethylene atmosphere, adding continuous monomers in stages, adding a zinc formaldehyde sulfoxylate aqueous solution in a maturation period, adjusting the pH value and the content of non-volatile components, adding t-butyl peroxy benzoate and a reducing agent FF6M to reduce the contents of residual monomers and formaldehyde, and adding a defoaming agent and stirring uniformly. The obtained emulsion has high flexibility and high strength, excellent low-temperature film-forming property and cold resistance, low residues and storage stability.

The utility model discloses a sinking type computer case heat dissipation channel which comprises a case and a dust cover, a long-strip-shaped heat dissipation groove is formed in a bottom plate of the case, side wings integrally bent downwards from the bottom plate are arranged on the two sides of the heat dissipation groove, the two side wings horizontally extend in the opposite direction to form blocking parts, and the blocking parts are arranged on the bottom plate of the case. The dustproof cover is installed below the heat dissipation groove in a sliding mode, the dustproof cover is detachably arranged, and when the fan row set is installed in the heat dissipation groove, the fan row set extends into the heat dissipation groove and is installed at the position of the blocking part. Through the bending arrangement of the side wings and the blocking parts, installation of the fan row group is facilitated, meanwhile, the installed fan row group does not protrude out of the upper wall of the bottom plate, the direction of fluid is more stable, flocculated flow is avoided, and meanwhile, the heat dissipation effect of the fan row group is improved, namely, the fluid can flow in the direction of the heat dissipation grooves. The dust cover is arranged below the blocking part in a sliding manner, so that dust deposition caused when the fluid passes through the bottom can be facilitated, and cleaning is facilitated.

The utility model discloses stirring and uniform mixing equipment for producing a fluorescent whitening agent, which comprises a shell, a motor is arranged at the top of the shell, the motor is in driving connection with a stirring mechanism, the stirring mechanism comprises an outer stirring rod and an inner rotating frame, at least one outer stirring blade is arranged on the outer stirring rod, and at least one inner stirring blade is arranged on the inner stirring frame; the rotating directions of the inner rotating frame and the outer rotating frame are opposite; a scraper is arranged on the side, close to the inner wall of the shell, of the outer stirring rod, at least one flow guide pipe is arranged on the side, close to the scraper, of the outer rotating rod, a channel is formed in the outer rotating rod, one end of the channel is located at the bottom of the outer rotating rod, and the channel is communicated with the flow guide pipe; the outer stirring rod and the inner rotating frame which are opposite in rotating direction are arranged, and the rack reciprocates to drive the circular gear to alternately rotate clockwise and anticlockwise, so that alternate reversing stirring of the outer stirring rod and the inner stirring frame is realized, the stirring uniformity is further improved, and material flocculation or deposition formed at the bottom of the shell due to one-way rotation is prevented.

The metal powder bed additive manufacturing system based on the three-layer wind field comprises a forming cavity, a stratosphere air inlet channel, a flow restraining layer air inlet channel and an air purifying layer air inlet channel are sequentially arranged on an air inlet face from bottom to top, and the stratosphere air inlet channel and the air purifying layer air inlet channel extend in the first direction; an air inlet channel outlet of the flow suppression layer air inlet channel points to the second direction; the air outlet face is provided with a stratosphere air outlet channel, a flow restraining layer air outlet channel and an air purifying layer air outlet channel, the first direction is the direction from the air inlet face to the air outlet face and is parallel to the printing breadth, and the second direction inclines towards the printing breadth relative to the first direction. Through the three-layer wind field design, the stability and the wind speed of the parallel wind field beside the printing breadth and the laser lens are guaranteed, internal flocculation is avoided, printing by-products are blown and collected to the maximum extent, and the printing breadth and the laser lens are prevented from being polluted.