67results about How to "Speed up thermal motion" patented technology

Electrically insulating layers having increased thermal conductivity, as well as associated devices and methods are disclosed. In one aspect, for example, a printed circuit board is provided including a substrate and an electrically insulating layer coated on at least one surface of the substrate, the electrically insulating layer including a plurality of hBN particles bound in a binder material.

Methods and devices for cooling printed circuit boards having at least one heat source are disclosed and described. The method can include coating a layer of diamond-like carbon (DLC) over at least a portion of the printed circuit board in order to accelerate movement of heat away from the heat source. Various heat sources may be present on a printed circuit board. In one aspect, the heat source can be an active heat source such as a heat-generating electronic component.

The invention relates to a soybean milk preparing method of a soybean milk grinder. The soybean milk preparing method comprises the following steps that: (a) a motor drives a smashing cutter to stir the soybean milk for t1 seconds so as to produce appropriate foam; (b) a heating device is started to heat water and a material until the mixture is going to leak out; and (c) the motor drives the smashing cutter to smash the mixture to prepare the soybean milk and boil the soybean milk by heating. The method is characterized in that: in order to replenish the foam and prevent the material from becoming adhesive in the heating process of stage (b), the soybean milk is stirred for t3 seconds every after a time interval of t2. The soybean milk preparing method stirs the soybean milk for 5 to 10 seconds before starting heating, so most of the material does not produce too mush foam and only anti-leaking requirement is basically met. In the heating process, the soybean milk is stirred once after a certain period of time to replenish the foam and prevent the material from being adhered to the bottom of the soybean milk grinder after being heated for a long time. Therefore, the disadvantages in the soybean milk preparing method in the prior art are overcome better.

The invention discloses a novel normal-pressure boiling dyeable biomass polyester fiber which comprises the following raw materials: 63-68wt% of terephthalic acid, 1.5-33wt% of biomass ethylene glycol, 1.5-33wt% of biomass 1,2-propanediol, 2-8wt% of monomer 5-sodiumsulfa bis-isophthalate (SIPE) and 0.01-0.03wt% of catalyst potassium fluotitanate. A preparation method of the polyester fiber comprises the following steps: performing esterification and polycondensation reaction on the raw materials to obtain a biomass polyester chip; and based on optimal fiber-spinning process parameters, producing to obtain the biomass polyester fiber having a normal-pressure boiling dyeable function. The fiber has the characteristics of natural softness, low static, favorable resilience and low-temperature dyeing, is boiling dyeable under normal pressure, has high dye-uptake rate and dye exhaustion rate, can be blended with a natural fiber such as wool and the like, has the advantages of cost saving, energy consumption reduction and clean production, can reduce the dependence of the chemical fiber industry on petroleum and can greatly relieve resource restriction and environment pressure.

The invention belongs to the technical field of preparation of a film material, and discloses a solution film formation method and device of an organic material. The method comprises the following stages of dissolving the organic material in a mixed solvent containing a high-boiling point solvent and a low-boiling point solvent, and depositing the organic material on a substrate by a film formation technology to obtain a liquid film; and carrying out normal-pressure evaporation on the substrate containing the liquid film under conditions of rotation, variable frequency vibration and programmable temperature rise to remove the low-boiling point solvent, stopping rotating and vibrating, evaporating the high-boiling solvent under conditions of vacuum and programmable temperature rise to obtain an organic material film. The substrate is shaken in a reciprocating way through rotation and variable frequency vibration, so that the solution keeps flowing, the difference between the edge and the middle of the solution is reduced, and the difference of the surface and the interior of the solution is reduced; and meanwhile, the thermal motion of solvent molecules is accelerated by programmable temperature rise, and the film formation quality of the solvent during the drying process is improved.

The invention discloses a washing machine as well as a control method and control device thereof. The control method comprises the following steps: obtaining the material type of the clothes; obtaining the rinsing parameters of the washing machine according to the material type of the clothes; and controlling the washing machine to rinse the clothes according to the rinsing parameters and controlling a heater of the washing machine to start heating. In the method, by controlling the heater to start heating in the rinsing process, the rinsing temperature can be increased, the thermal motion of matter molecules in water is accelerated, the reaction speed is increased, and the rinsing performance of the washing machine is improved; and moreover, the washing machine and the clothes are effectively sterilized and disinfected by the high-temperature water.

The invention discloses a proton transfer reaction device with a multipole rod. The device comprises a drift tube for the proton transfer reaction of a proton supplier and analyte. The front end of the drift tube is provided with a proton supplier inlet and a carrier gas introduction channel for introducing sample molecules and a carrier gas, and the rear end of the drift tube is provided with a carrier gas outlet channel and an analyte ion outlet. The sectionalized multipole rod is arranged in the drift tube and connected with a controllable boosted radio frequency power supply. By the device, the cross section of an ion beam is controlled by controlling the amplitude of a boosted radio frequency voltage loaded on the sectionalized multipole rod, so the cross section for the proton transfer reaction at the front end is enlarged and then maximal proton transfer reaction is realized; the cross section of the ion beam at the rear end is reduced, so an ion transport rate is improved, pollution of neutral molecules to a spectrum analyzer is avoided and the flexibility of the analyzer is improved.

A microwave integrated machine for production of an aerogel material and a method for continuous production of the aerogel material are disclosed. The invention belongs to the technical field of aerogel material production and especially relates to a microwave integrated machine and an efficient production method for continuous production of the aerogel material by using the microwave technique. The invention aims to solve the technical problem that existing aerogel preparation methods have long production period and the internal skeleton structure is collapsed and the thermal insulation performance is reduced. The method of the invention comprises the following steps: preparing a wet aerogel material, letting the wet aerogel material enter a solvent replacement device and then enter a hydrophobic modification device, and drying to obtain the aerogel material; letting the evaporated solvent gas enter a shell and tube condenser, condensing for gas-liquid separation, recycling the solvent, returning an inert gas to the equipment for recycling so as to complete a production period. According to the method, each solvent replacement only takes more than ten minutes, and each hydrophobicmodification only takes more than ten minutes. Thereby, production efficiency is greatly improved.

The invention belongs to the field of metal additive manufacturing, and concretely discloses an electromagnetic assisted electric arc additive manufacturing and forming device and a method. The electromagnetic assisted electric arc additive manufacturing and forming device comprises a base plate, an electric arc welding gun, an electromagnetic coil, a line laser scanner and a magnetic-field measurement instrument, wherein the electric arc welding gun and the electromagnetic coil are located above the base plate; the electric arc welding gun is used for welding and forming a part to be formed on the base plate; the electromagnetic coil is used for applying a magnetic field on a weld pass molten pool of the part to be formed; the line laser scanner is located above the part to be formed andis used for inspecting a surface appearance of a weld pass; and the magnetic-field measurement instrument is located between the electromagnetic coil and the part to be formed, is connected with the electromagnetic coil, and is used for measuring and controlling the magnetic field intensity of the electromagnetic coil applied to the weld pass molten pool. According to the electromagnetic assistedelectric arc additive manufacturing and forming device and the method provided by the invention, during electric arc additive manufacturing, the weld pass molten pool is supported through an electromagnetic induction force, so that the weld pass is prevented from flowing, the residual stress of a welded joint is reduced, and a mechanical property of the formed part is improved.

The invention relates to a surface treatment process for enhancing the low-temperature resistance of plastic. The surface treatment process specifically comprises the steps of degreasing plastic, swelling plastic, etching plastic, carrying out preliminary conditioning, activating plastic, preparing a low-temperature-resistant layer, carrying out treatment by oxidizing flame, plating the low-temperature-resistant layer, washing with water and drying. The surface treatment process disclosed by the invention has the advantages that the process is simple, the treatment time is shortened, the low-temperature resistance of plastic can be significantly improved, and the temperature brittleness of plastic is reduced; the treated plastic has the characteristics of relatively high surface smoothness and more beautiful appearance.

The invention relates to a preparation method of pomegranate wine. The preparation method comprises the following steps of: cleaning fresh pomegranates, adding 95% of deodorizing edible alcohol in the fresh pomegranates according to a certain proportion, adding antioxidant in the fresh pomegranates, and pulping the fresh pomegranates with the edible alcohol and the antioxidant, thereby obtaining pomegranate wine seriflux containing pomegranate peels and seeds; and performing microwave radiation treatment on the pomegranate wine seriflux which is transmitted into a microwave field so as to promote polyphenols and other ingredients in the pomegranate peels and seeds to be quickly dissolved into the pomegranate wine seriflux, and carrying out follow-up processing such as squeezing, filtering and blending on the pomegranate wine seriflux according to a conventional method, thus producing the pomegranate wine product containing the rich polyphenols ingredients. The microwave treatment needs a low temperature and short time, so that a long-term impregnating process and adverse effects can be avoided, the production efficiency can be greatly improved, the loss of the color and luster, the flavor and the nutritional ingredients of the pomegranate wine can be furthest reduced, and the content of functional compositions such as the polyphenols in the pomegranate wine can be effectively increased; and microorganisms and enzyme can be further effectively killed by the microwave treatment. The method provided by the invention is efficient and energy-saving, and the industrial production can be easily realized.

The invention relates to a monocrystal silicon wafer polishing process capable of obtaining a high polishing rate. In a coarse polishing process, an American Dupont SR330 coarse polishing solution is adopted, and diluted by pure water according to the ratio of 1:20 to 1:40; the flow is 23.5-24.5 L / min; a Rohm and Haas SUBA600 polishing pad is adopted; and the coarse polishing process comprises the following three steps: 1, using a coarse polishing solution to polish for 10 s, the rotating speed of a big disk being 23-27 rpm, the rotating speed of a central guide wheel being 48-52 rpm, and the pressure being 47-53 kPa; 2, using a coarse polishing solution to polish for 7-13 min, the rotating speed of the big disk being 38-42 rpm, the rotating speed of the central guide wheel being 78-82 rpm, and the pressure being 100-200 kPa; and 3, using pure water to polish for 40 s, the rotating speed of the big disk being 23+ / -27 rpm, the rotating speed of the central guide wheel being 48-52 rpm, and the pressure being 47-53 kPa. The polished section processed by the process has the removal rate up to 1.83-2.09 micron / min, which is far higher than the average level of 1 micron / min in the industry, and meanwhile, and has the pass percent up to more than 90% stably. The improvement of the productivity of the polished section can reduce the fixed cost, thereby meeting the requirements of domestic and foreign markets.

The invention belongs to the technical field of gene engineering, and develops a universal type kit used for rapidly extracting plant genome DNA for PCR amplification and a method, and the kit and the method are applicable to rapid extraction of DNA of multiple plant genomes, and satisfy research about plant molecular biology and genetics and rapid identification on transgenic crops. The kit comprises a balance solution, a lysate, a DNA combination solution, a DNA washing solution, a DNA eluent and a DNA adsorption column. The purpose of separating and purifying DNA is realized by utilizing the different combination degrees of a silicon matrix and DNA at different salt ion concentration and pH conditions. The method is rapid and simple in operation, is capable of finishing DNA extraction within 15 min, does not need phenol and chloroform extraction during extraction, and avoids pollution coming from organic solvents, and DNA extracted by employing the method has good amplification effect on 300-4500 bp plant endogenous gene and exogenous transgene.

The invention aims at providing a combined skin care method combining atomization, oxidation, magnetization and far infrared rays. The 4D combined skin care method comprises the following steps of firstly, conducting heating and atomization on a cell nutrient solution, then the atomized cell nutrient solution is sufficiently mixed with oxygen, then the cell nutrient solution mixed with oxygen is subjected to magnetization through a high-intensity magnetic field, and then the cell nutrient solution obtained after magnetization is sprinkled on skin of the human body under the action of the far infrared rays. Refining of water molecule clusters is beneficial to water absorption of aquaporin on cells, quick action is conducted on the basal layer of epidermis, and the skin is deeply nourished.

The invention provides a cleaning method of an ion implantation device. The ion implantation device comprises an ion source, a leading-out electrode system and a scanning cavity, wherein the ion source is used for generating plasma and provided with a lamp filament, the leading-out electrode system is used for leading out a band-shaped ion beam, and the scanning cavity is used for conducting ion scanning on a substrate and provided with a substrate clamp. The cleaning method of the ion implantation device comprises the steps of preparation, cleaning, maintenance and finishing. The cleaning method of the ion implantation device is suitable for the cleaning stage before ion implantation, the cleaning stage in the interval of ion implantation and the cleaning stage after ion implantation. By the adoption of the cleaning method of the ion implantation device, the ion source, the leading-out electrode system and the substrate clamp are all effectively cleaned, and it is avoided that unstable accumulated objects which are not cleaned away peel off.

The invention provides a dispergation device, which is used for being placed in dispergation solvent to remove the bonding glue between multiple optical lens groups. The dispergation device comprisesa rotary device and a load bearing device, wherein the load bearing device is fixed on the rotary device and is used for bearing the optical lens groups to ensure that the rotary device can drive theoptical lens groups to rotate. The dispergation device in the invention utilizes the rotary device to drive the load bearing device which accommodates the optical lens groups to rotate in the dispergation solvent. The thermal motion of the dispergation solvent is enlarged due to the motion of the rotary device, thus greatly improving the dispergation speed; and the rotary device is always in a rotary state in the dispergation process, thus being capable of preventing the residue stain of the glue body from sedimentating on the optical lens groups; in addition, the dispergation device has simple structure and low assembly cost and does not need to utilize parts with high cost.

The invention discloses a comprehensive utilization method of a Cr(VI) (hexavalent chromium)-adsorbed magnetic macromolecular material. The comprehensive utilization method comprises the following steps of firstly, collecting the Cr(VI)-adsorbed magnetic macromolecular material, uniformly mixing, cleaning in an ultrasonic wave-assisted or microwave-assisted way, magnetically separating, and activating; then, sampling, and representing; finally, applying the Cr(VI)-adsorbed magnetic macromolecular material to absorb and degrade the heavy metal, methylene blue pigment and chlorophenol environment pollutants in wastewater. The comprehensive utilization method has the advantages that the Cr(VI)-adsorbed magnetic macromolecular material NMP-Cr is collected, activated and recycled by an ultrasonic wave-assisted, magnetic separating and vacuum drying cooperating method; the dispersivity is good, the technology is simple, the recycling efficiency is high, and the like; the defects of easinessin agglomeration, poor dispersivity and the like of the magnetic composite material in the recycling process can be overcome; the morphology of the magnetic composite material is favorably stored, theprocedure and cost are reduced, and the pollution to environment due to chromium-containing waste material flowing into the environment system can be avoided.

A system for preventing accumulation of ice, snow, slush, water, other moisture, sand, mud, and debris on an exterior of a vehicle. The system includes vibratory elements and can further include heating elements mounted on or to shedding wheel liners or underbody panels of the vehicle. The system has a controller that can be in communication with one or more accumulation sensors to manually or automatically energize vibratory and heating elements to prevent or shed accumulation when corresponding conditions are sensed by the sensors. A preferred vibratory element is an acoustic transducer that can be a motor or transducer acoustically coupled to a wheel liner or underbody panel in a manner that vibrates the liner or panel when energized. Each liner or panel is equipped with at least a plurality of vibratory elements arranged to relatively uniformly vibrate the liner or panel in a manner that prevents or sheds accumulation.

The invention relates to an ultrasonic permeation enhancing preparation method for a preserved fresh flower and a preserved fresh flower and belongs to the technical field of flowering branch chemicalpreservation. The ultrasonic permeation enhancing preparation method for the preserved fresh flower comprises the following steps of conducting decolorizing treatment on a fresh cut flower, then immersing the fresh cut flower into a liquid phase substitute for ultrasonic treatment, and drying. According to the ultrasonic permeation enhancing preparation method for the preserved fresh flower, thethermal motion of substitute molecules and water molecules can be quickened by the cavitation effect and heat effect of ultrasonic, therefore the disadvantage can be overcome that the power of insideand outside diffusion of the moisture in the flower when replacement is conducted in the normal condition; meanwhile, micro channels are formed on the surface of petal tissues and macromolecules in the liquid phase substitute is promoted to permeate into the micro channels for moisture replacement, so that the shrinking degree of the petals is effectively reduced; moreover, all the components in the liquid phase substitute is uniformly distributed in cell tissues, so that the overall preserved fresh flower is uniformly dyed, the flexibility of the petals is good, the preserved fresh flower ismoist, soft and good in soundness and the appearance form of the fresh cut flower is largely kept.

The invention discloses a proton transfer reaction device with a multipole rod. The device comprises a drift tube for the proton transfer reaction of a proton supplier and analyte. The front end of the drift tube is provided with a proton supplier inlet and a carrier gas introduction channel for introducing sample molecules and a carrier gas, and the rear end of the drift tube is provided with a carrier gas outlet channel and an analyte ion outlet. The sectionalized multipole rod is arranged in the drift tube and connected with a controllable boosted radio frequency power supply. By the device, the cross section of an ion beam is controlled by controlling the amplitude of a boosted radio frequency voltage loaded on the sectionalized multipole rod, so the cross section for the proton transfer reaction at the front end is enlarged and then maximal proton transfer reaction is realized; the cross section of the ion beam at the rear end is reduced, so an ion transport rate is improved, pollution of neutral molecules to a spectrum analyzer is avoided and the flexibility of the analyzer is improved.

The invention relates to the technical field of research, development and production of fireproof coatings and discloses a fireproof coating for thermal insulation walls. The fireproof coating is prepared from components in parts by weight as follows: 30-35 parts of a polyvinyl acetate emulsion, 20-25 parts of polyvinyl alcohol, 18-22 parts of ammonium polyphosphate, 16-20 parts of pentaerythritol, 14-18 parts of melamine resin, 8-12 parts of hexamethylenetetramine, 4-6 parts of chlorinated paraffin, 3-5 parts of a surfactant, 1.3-1.5 parts of glass powder, 0.8-1.0 part of asbestos powder, 0.3-0.5 parts of superfine dispersible nano alumina powder, 0.1-0.3 parts of nano silica and 35-40 parts of water. The fireproof coating has a very low heat conduction coefficient and can improve the thermal insulating property of a thermal insulation material, prevent thermal motion enhancement caused by increased heat conduction coefficient after water absorption and forms a sponge carbonization layer for fire isolation.

The invention discloses a zero-discharge comprehensive utilization system for the waste of a large-scale pig farm. The zero-discharge comprehensive utilization system comprises a collecting and preprocessing unit, an anaerobic fermentation unit, a biogas utilization unit, a biogas power generation unit, a heat recycling unit, a biogas slurry processing unit, an ozone generating system, an oxidizing unit and a biogas slurry circulating processing unit. The zero-discharge comprehensive utilization system has the advantages that the system is efficient, thorough, free of secondary pollution, capable of lowering pig cultivation environment protection cost, capable of creating high economic benefits, capable of saving water and capable of protecting ambient environments; pig manure is used forperforming anaerobic fermentation, generated biogas is used for generating power to reduce the production and living power consumption cost of the pig farm, the high power consumption cost problem ofa O3 / UV advanced oxidation treatment process can be solved, and grid-connected power generation can be achieved to earn electricity fee income; processed biogas slurry tail water can be used for washing pig houses, water can be saved, pig epidemic diseases and pig house mosquitoes and flies can be reduced, and production efficiency is increased.

The invention relates to the technical field of washing and cleaning supplies, and particularly discloses a bacteriostatic hand-washing soap piece and a preparation method thereof. The bacteriostatic hand-washing soap piece comprises a film-forming agent, an amino acid surfactant, an anionic surfactant, a nonionic surfactant, fatty acid, alkali, a bacteriostatic agent, an auxiliary agent, an additive and water. The preparation method comprises the following steps: 1) adding the water into a container, then adding the film-forming agent, stirring, heating, and keeping the temperature constant after the film-forming agent is completely dissolved; 2) adding the amino acid surfactant, the anionic surfactant and the nonionic surfactant while stirring, and stirring for dissolving; 3), adding the fatty acid, stirring and dissolving; 4) adding the alkali under the condition of stirring, stirring for dissolving, and keeping the temperature constant until the system completely reacts; and 5) adding the auxiliary agent, the additive and the bacteriostatic agent, stirring and dissolving, and tabletting at 100-110 DEG C to obtain the bacteriostatic hand-washing soap piece. The antibacterial hand washing soap piece has the advantages of being mild and strong in cleaning strength.

The invention discloses a steel rim vehicle wheel surface phosphating treatment method and relates to the technical field of steel treatment. The method comprises: (1) grinding, (2) cleaning, (3) plasma treatment and (4) phosphating treatment. The method can well protect the steel rim vehicle wheel surface, improve the film forming stability, greatly improve the compactness and uniformity of the phosphated film, realize high phosphated film adhesion, improve the corrosion resistance and wear resistance of the surface of the steel rim vehicle wheel surface, realize high phosphated film purity,facilitate precipitate removal, shorten the conventional high-temperature surface phosphating treatment time, realize fast phosphating treatment at the normal temperature, prevent heating, solve the problem that the conventional high-temperature phosphating treatment method easily causes phosphated film impurities and precipitates difficult to remove, and improve the phosphating efficiency.

The invention discloses a biopolymer fiber and a processing technology thereof. The biopolymer fiber is prepared from biopolymer polyester chips and cellulose nanocrystals by blend melt spinning. Interaction of biopolymer polyester chip molecules is enhanced by association hydrogen bonds formed among the cellulose nanocrystals and the biopolymer polyester chips, connecting bridges among biopolymerpolyester chip macromolecules are formed, relative slip of biopolymer polyester chip macromolecular chains is inhibited, so that the breaking strength of the biopolymer fiber is improved. As bio-based mixed polyols contain a large quantity of hydroxide radicals, hydrophilic groups are introduced into the prepared biopolymer polyester chip macromolecular chains, the hydrophilic performance of thebiopolymer polyester chips is improved, and hygroscopicity of the biopolymer fiber is improved. Experimental results indicate that the prepared biopolymer fiber has higher breaking strength, good toughness and mechanical performance and excellent hygroscopicity.

The invention discloses a kit and method for extracting collybia radicata genome DNA (Deoxyribonucleic Acid). The kit is prepared from the following components: an equilibrium liquid including 1 percent of Na2SiO3.9H2O and 1 percent of NaOH, lysate including 5.0M of guanidine hydrochloride, 25 percent of isopropanol and 1 percent of PVP K30, a cleaning solution including 20 mM of NaCl, 20 mM of Tris-HCl and 85 percent of ethanol with pH of 7.5, eluent including 10 mM of Tris-HCl with the pH of 8.5 and a DNA adsorption column. The reagent for extracting the collybia radicata genome DNA does notcontain toxic substances such as phenol and chloroform, so that higher safety is realized; the extraction method is simple and efficient and the extraction time is shortened to 15 minutes; an extracted product has high purity and good integrity, and can be directly used for molecular biology and genetic research.

The invention relates to the technical field of medical instruments, in particular to a method for improving the electroporation effect and a preheating pulse ablation system. According to the method for improving the electroporation effect, a preheating pulse ablation system is included, compared with the prior art, the method for improving the electroporation effect and the preheating pulse ablation system are provided, and target biological tissue is preheated through intracardiac radio frequency ablation (RFA), so that cell activity is improved.

The invention discloses a reagent for extracting total DNA of bamboo shoots and an application. The method comprises the steps of column balancing, lysing crackinga sample, absorbing the DNA, cleaning, and eluting the DNA. Compared with the traditional DNA extraction method such as a the CTAB method, the a SDS method, the an alkali lysising method and a conventional kit, the method provided byof the invention has the advantages of less consumption of samples, high purity of the DAN samples, good completeness, simple operation and the like, the extraction time can be reduced from 1 to 2 hours to 15 minutes, in the whole extraction process, no toxic reagent such as chloroform, phenol, and beta-mercaptoethanol and the like is used, and the research personnel is ensured enabled not to be harmed by the toxic reagent. An experiment result shows that the reagent is suitable for extracting the total DNA of various fungi such as the bamboo shoots.

The invention relates provides a reagent for extracting total DNA of lucid ganoderma and the application of the reagent. The total DNA is rapidly and efficiently extracted from about 50 mg of myceliumand sporocarp sample by adopting the steps of crushing, cracking, DNA adsorption, rinsing, eluting and the like; for fresh dry samples, and total DNA suitable for ITS identification and other molecular biology experiments also can be extracted. Further experiment proves that the method also can be applied to edible-medicinal fungi such as cordyceps militaris, agaricus blazei murill and grifola frondosa. According to the method, the extraction time of single sample is shortened to 15 minutes; in addition, the extracted DNA has the advantages of good integrity and high purity, and can be directly used for downstream molecular biology experiments such as PCR, Real-Time PCR and molecular markers.

The invention discloses a preheating type gas multi-stage mixing device which comprises a plurality of gas cylinders for gas to be mixed, a plurality of gas input branches, a multi-stage gas mixing chamber, and a mixed gas output pipeline; the gas cylinders for gas to be mixed are used for containing the gas to be mixed; the plurality of gas input branches are used for conveying to-be-mixed gas into the gas cylinders; the multi-stage gas mixing chamber comprises a first-stage mixing chamber, a second-stage mixing chamber, a third-stage mixing chamber and a gas slowing chamber which are communicated in sequence, and the gas cylinders are respectively communicated with the first-stage mixing chamber through the gas input branches; and the mixed gas output pipeline is communicated with the tail end of the gas slowing chamber and is used for outputting mixed gas. The purpose of dynamic and uniform mixing is achieved through precise control and multi-stage mixing, use is safe and reliable,dynamic and uniform mixing of various gases can be achieved, and the gas mixing uniformity is improved.