77results about How to "Reduce the chance of formation" patented technology

The invention relates to a counter-pressure casting process for ZL424 aluminum alloy castings. The process includes the steps: (1) alloy burdening; (2) using secondary refining and intermediate purifying for smelting alloy; (3) using a counter-pressure casting method for preparing ZL424 aluminum alloy castings; (4) cleaning the ZL424 aluminum alloy blank castings prepared at the step (3) before heat treatment; (5) checking the ZL424 aluminum alloy blank castings subjected to heat treatment. Blank castings prepared by the counter-pressure casting process overcome defects of ZL424 aluminum alloy castings obtained by traditional gravity casting methods, internal pinholes, microscopic shrinkage porosity and microcracks of castings are eliminated, and chemical component acceptability, mechanical performance and compactness of the castings are improved. In addition, the process has the advantages of high efficiency, high casting yield, low manufacturing cost and the like.

An axial-flow pulse blood pump for the patient of acute heart failure and final-phase heart disease is composed of a stator consisting of windings and shell, and a rotor consisting of high-energy magnet and propulsion unit. Said propulsion unit comprises spiral rotor, central axle and three pairs of cylindrical magnets to form a sealed one-way spiral blood channel. The rotation speed of rotor is pulsed by changing the pulse width and frequency of voltage or current in stator.

The invention provides a method for removing laser welding pores of a medium-thick D406A ultra-high-strength steel, and aims at solving the problem of pores of a medium-thick D406A ultra-high-strength steel plate in welding. The method comprises the following steps: grinding and cleaning a part to be welded; assembling; setting backing weld and filling weld process parameters; controlling the welding process parameters through a robot integration system; arcing through TIG (Tungsten Inert Gas Welding) electric arc; stabilizing the electric arc for 1 to 2 seconds; controlling a laser to emit laser; finally controlling a robot to drive a laser working head and a TIG welding gun to work together to finish the welding process. According to the method, different pore inhibiting measures are carried out for backing weld and filling weld.

The invention discloses a pearl nucleus active liquid used for saltwater pearl culture and a preparation method thereof. In the pearl culture process, by using drug-treated pearl nuclei, immunological rejection on the pearl nuclei after a pearl shell nucleus-implanting operation can be reduced, the migration and the division of small cells are irritated, the formation of pearl sacs is promoted, the wound infection after the operation is reduced, and the goal of comprehensively improving the pearl quality and yield by reducing the nucleus-spitting rate, increasing the thickness of pearl layers and improving the survival rate of cultured pearls is achieved. In the invention, the pearl nucleus active liquid is prepared by utilizing glacial acetic acid, chitosan, tetracycline antibiotics and sterilized filtered seawater. When the pearl nuclei treated by the invention are used for pearl culture, the survival rate of the cultured pearls is increased by 2.59 to 7.33 percent, the pearl-containing rate is increased by 9.8 to 20.07 percent, and the high-quality pearl rate is increased by 5.97 to 12.55 percent.

The invention discloses a 2-amino-4-acetamino anisole synthesis process. The process comprises the following steps that in methyl alcohol, 2,4-diaminobenzene methyl ether (III) and acetic anhydride are subjected to an acylation reaction as follows under the effect of an acid-binding agent to obtain 2-amino-4-acetamino anisole (IV), wherein the mole ratio of the acid-binding agent to the 2,4-diaminobenzene methyl ether is 0.3:1-0.6:1. The synthesis process is low in energy consumption, low in cost, small in amount of solid waste and liquid waste, free of pollution, environmentally friendly, easy to operate, mild in reaction condition and high in industrial safety coefficient, the target compound yield is 86% or above (based on initial reaction raw materials), the HPLC purity is 99.0% or above, and the target compound is high in yield, good in quality, and more applicable to industrial production.

The invention discloses hydrothermal degradation comprehensive processing technology for domestic garbage. The technology is characterized by comprising the following steps of: rapidly degrading the garbage which is subjected to magnetic separation, feeding the wastewater produced during digestion into a water treatment device and discharging the water until the water reaches the standard; feeding the digested garbage into a separation device and burning the separated undegraded combustible, wherein a part of the combustion product is used as saturated steam during the hydrothermal degradation and the other part is used for providing heat or generating power; treating the smoke produced by the burning by using a smoke treatment system and discharging the smoke after the smoke reaches the standard, wherein the slag produced after the burning is used for paving roads or making bricks or used as covering soil at landfill sites; performing composting on the separated degraded nutritive soil, wherein the degraded nutritive soil is used for loosening soil or to be prepared into various organic compound fertilizers; and recycling the separated ferrous metal. The technology has the advantages of complete degradation, recycling of resources, heat supply, power generation and capability of ensuring the discharging of the smoke, the wastewater and the like after reaching the standards and realizing harmlessness, reduction and reutilization.

The invention discloses a cleaning briquette coal binder. The binder comprises the following raw materials: 0.13-0.30% of lead carbonate, 0.20-0.40% of magnesium chloride, 0.20-0.40% of calcium oxide, 0.20-0.40% of an oxidizing agent, 77.0-87.0% of a crosslinking agent, 0.15%-0.25% of sodium hydroxide, 0.30-0.60% of a tackifier, 0.15%-0.25% of magnesium sulfate, 1.50-2.50% of sodium humate, 0.20-0.30% of a smoke suppressant and 8.00-12.0% of kaolin. The briquette coal binder disclosed by the invention has the effects of suppressing smoke, preventing moisture, reducing dust, fixing sulfur, inhibiting nitrogen and the like, and is developed in line with the national situation of energy conservation, emission reduction and haze treatment according to China coal energy actual application and the characteristics of the haze formation cause in recent years; the binder has prominent energy conservation and emission reduction effects and an oxidative combustion-promoting effect; and since the binder is fully burnt, the energy conservation effect is achieved.

The invention discloses a liquid filtering method. Liquid to be filtered is filtered from the outer side of a conical filtering screen to the inner side; an openable sewage discharging opening is formed in the outer side of the conical filtering screen; impurities blocked by the conical filtering screen can be discharged from the sewage discharging opening. The invention further discloses a liquid filtering device. The liquid filtering device comprises an equipment body and a filtering body positioned in the equipment body; the filtering body is the conical filtering screen; the open end of the conical filtering screen is hermitically and fixedly connected with the inner wall of the equipment body; the conical outer side of the conical filtering screen is a liquid feeding side, and the conical inner side of the conical filtering screen is a liquid discharging side; a liquid inlet and a sewage discharging opening are formed in the equipment body at the liquid feeding side; the sewage discharging opening is formed in the lowest end of the equipment body at the liquid feeding side; a sewage discharging valve is arranged at the sewage discharging opening; a liquid outlet is formed in the equipment body at the liquid discharging side. According to the liquid filtering method and the liquid filtering device, by the adoption of the conical filtering body for reverse filtering, fluid forms shearing force on the surface of the filtering body, so that the water film forming possibility is reduced, and the loss of filtering resistance is reduced; the liquid filtering device has a self-cleaning resetting function of the filtering body.

The invention discloses a pressure casting device which comprises a mould, a gas exhaust structure arranged in the mould and a vacuum pump arranged on the outer part of the mould; the mould comprises a first mould base, a second mould base as well as a mould cavity and a pouring gate defined by the first mould base and the second mould base when the first mould base and the second mould base are closed; through the pouring gate, the mould cavity communicates with the outer part of the mould; the gas exhaust structure comprises a first gas exhaust plate arranged on the first mould base, a second gas exhaust plate arranged on the second mould base and a gas exhaust channel defined by the first gas exhaust plate and the second gas exhaust plate when the first mould base and the second mould base are closed; and a first end of the gas exhaust channel communicates with the mould cavity in the mould, and a second end opposite to the first end is connected with a vacuum pump through a connecting tube. The pressure casting device disclosed by the invention quickly exhausts air in the mould cavity through the gas exhaust structure, not only can reduce porosity of pressure castings, also increases a mould filling rate, and ensures a relatively high yield and relatively high production efficiency. The invention also discloses a pressure casting method.

A bridge bulk mass concrete skewback structure has the advantages of being concise in structure, clear in stress, simple and convenient to construct, economical and reasonable, and can not only well meet the longitudinal and transversal stressing requirements of the skewback structure, but also simultaneously lower influence brought by heat of hydration and concrete shrinkage during construction process. The bridge bulk mass concrete skewback structure comprises a skewback (10) which supports and fixedly connecting a border pier (20) and an arch ring (30), and the whole of the skewback (10) is in a transversal uniform-section step shape and composed of a lower-portion plain concrete casting body (11) and an upper-portion reinforced concrete casting body (12). A transversal breaking joint (13) is arranged in the middle of the plain concrete casting body (11), and steel plates (14) are filled in the transversal breaking joint (13). The border pier (20) and the arch ring (30) are cast on the upper-portion reinforced concrete casting body (12).

The invention relates to a fluxing agent growing method of K2Al2B2O7 crystal. The method comprises the following steps: mixing K2Al2B2O7 with fluxing agent in a molar ratio of 1:1.4-2.2, placing the mixture in a 950-1050 DEG C of muffle furnace to melt, cooling at room temperature to obtain growing raw material; then placing in an electric stove wire heating crystal growing furnace to heat and obtain a high temperature solution; introducing seed crystal under 2-10 DEG C above saturation temperature; cooling by using the saturation point temperature as the cooling starting point while rotating the crystal, wherein the vertical temperature gradient of the high temperature solution is 0.05-1 DEG C/cm; lifting the crystal, which grows to the required size, from the level surface to cool to the room temperature and obtain K2Al2B2O7 crystal, wherein the fluxing agent is M'F, M''F or M'F+M''F, M' is Li, Na or K, and M'' is Ca or Ba. The method of the invention has low growing temperature and the growing system has low volatility and viscosity so that solute can be conveniently transported and high optical quality K2Al2B2O7 crystal without inclusion and optical path can be grown.

The invention belongs to the field of nodular cast iron casting, and relates to nail-like-graphite-free nodular cast iron for wind power equipment and a preparation method thereof. By optimizing the component content of the nodular cast iron, intake of harmful elements is reduced, the carbon content is strictly controlled in the eutectic period, after a large number of silicon solid solutions are formed, dissolution of carbon in hexagonal lattices is accelerated, and precipitation of a large number of carbon on the grain boundary is prevented. At the moment, anti-nodulizing segregation elements with a high content exist on the grain boundary, and the diffusion and accumulation of carbon to a nucleation substance from different directions are prevented from being blocked, so that graphite is balled, and nail-like graphite is prevented from being formed. In the preparation process of the nodular cast iron, the pouring temperature, the mold filling speed and the heat preservation time are strictly controlled, segregation of anti-nodulizing elements is reduced, the forming probability of the nail-like graphite is reduced again, and the physical performance of the cast iron is guaranteed to a certain degree.

The invention discloses a high-strength automobile wheel steel with excellent stretch flangeability and a production method thereof. The chemical composition in steel is by weight percentage: C 0.07%~0.1%, Si0.15%~0.25%, Mn 1.2%~1.4%, P<0.02%, S<0.008%, Als0.02%~0.04%, RE /S=1.8-2.2, wherein the rare earth RE is one or a combination of more than two elements in La, Ce and Nd, the content is 0.007%-0.018%, and the balance is Fe and unavoidable impurities. Heat the continuous casting slab to 1200-1300°C and keep it warm for 2-3 hours; the starting temperature of rough rolling is 1100-1250°C, the finishing rolling temperature is >1000°C; the finishing rolling starting temperature is 950-990°C, and the total reduction ratio is >70 %, the final rolling temperature is 780-840°C; the laminar flow cooling process is adopted, the cooling rate is 25-30°C/s, and the final cooling is 450-500°C for coiling.

The invention discloses a heat treatment method for reducing block-shaped Nb in Inconel783 alloy and relates to the technical field of alloy heat treatment. The heat treatment method for reducing the block-shaped Nb in the Inconel783 alloy is put forward based on the problem that the block-shaped Nb is precipitated from the inside to affect the material use safety in the use process of the Inconel783 alloy. The heat treatment method comprises the following steps of (1), solid solution treatment; (2), beta aging treatment; and (3), gamma' aging treatment. The heat treatment method for reducing the block-shaped Nb in the Inconel783 alloy has the beneficial effects that the Nb in materials can be refined, the size of the block-shaped Nb is reduced, in subsequent aging, NbC of tiny size is precipitated out, fine and uniform carbide can improve the anti-slip ability of grain boundary significantly, and the probability of formation of harmful inclusions inside the materials is reduced.

The invention relates to a wafer cutting liquid which is prepared from 100 of purified water, 3 of glycerin and 0.02 of silicate by weight proportion. By changing the essential component in the existing cutting liquid from soft water to the purified water, the invention reduces the component of hard ions in the cutting liquid so as to reduce the combination probability of soft ions and hard ions,and the formation probability of grains in the cutting liquid is greatly reduced.

The invention belongs to the field of gene engineering, and relates to a zipper fastener structure for promoting formation of protein dimers and an application thereof, and the zipper fastener can beused for dimerization of homologous proteins and dimerization of heterologous proteins, and can also be used for polypeptide cyclization, dimerization of polypeptides and extension of polypeptides. Some examples can obtain an ESAT6-CFP10 dimer close to native conformation, wherein the dimer has better solubility and has a better stimulation effect on memory T cells than ESAT6-CFP10 protein expressed by linear fusion. The inventor also finds that the dimer zipper fastener can help to form more stable cyclic polypeptide, and the CCP polypeptide added with the dimer fastener can increase the detection rate of citrullinated antibody in serum of rheumatoid arthritis patients.

The invention discloses a process for synthesizing 2-amino-4-acetylaminoanisole. The process comprises the steps of preparing 2,4-dinitroanisole from 2,4-dinitrochlorobenzene, which serves as a raw material, in methanol, in the presence of sodium hydroxide or potassium hydroxide, carrying out reduction in the presence of action of Pd/C catalyst by taking hydrazine monoformate as a hydrogen sourceso as to prepare a 2,4-diaminoanisole-methanol solution, and then, subjecting 2,4-diaminoanisole and acetic anhydride to a partial acylation reaction in the presence of an acid binding agent, therebypreparing the 2-amino-4-acetylaminoanisole. According to the process disclosed by the invention, the energy consumption is low, the cost is low, the volume of solid waste and waste liquid is small, the process is environmentally friendly, the operation is simple, the reaction conditions are mild, the industrial safety coefficient is big, the total yield of a target compound is 85% or more (by initial reactants), the HPLC purity is 99.0% or more, and the target compound is high in yield and good in quality, so that the process is more applicable to industrial production.

The invention is suitable for the technical field of steel wire rod machining, and provides a chromium alloy non-quenched and tempered steel wire rod and a production method thereof. The chromium alloy non-quenched and tempered steel wire rod comprises the following chemical components of, by weight, 0.22-0.31% of C, 1.20-1.55% of Mn, 0.15-0.30% of Si, 0.30-0.40% of Cr, less than or equal to 0.012% of P, less than or equal to 0.008% of S; less than or equal to 0.05% of Ni, less than or equal to 0.05% of Cu, less than or equal to 0.03% of Mo, less than or equal to 0.003% of Al, less than or equal to 0.002% of Ti, less than or equal to 0.002% of O, less than or equal to 0.005% of N, 0.05-0.20% of V, and the balance Fe and inevitable impurities. According to the method, the carbon content isreduced, the manganese content is reduced, the carbon segregation of the wire rod is improved, the plasticity of the wire rod is slightly improved, the forming probability of net carbon is reduced bycombining high-temperature rolling and controlled cooling processes, and the user machining wire breakage rate is reduced, so that the production efficiency of the user is improved; and in the coolingprocess, the process design of proper quick cooling and then slow cooling is adopted, growth of grains is controlled, ferrite-pearlite zonal segregation is reduced, and meanwhile, the situation thatthe cold working performance is deteriorated due to too high strength caused by an abnormal quenching structure is avoided.

The invention provides a preparation process of H08A steel. The preparation process comprises the following specific steps of first, smelting in a converter, wherein magnesium alloy is added in the tapping process to carry out pre-deoxidation and argon blowing, and the free oxygen content of molten steel is controlled to range from 80 ppm to 100 ppm; second, LF refining, wherein calcium is added in the process to remove oxygen again, and the free oxygen content is controlled to range from 10 ppm to 20 ppm after LF refining heating of the molten steel is finished; and third, continuous casting;wherein according to the feeding manner of adding the magnesium alloy in the first step, powdery magnesium alloy is blown into the bottom of a steel ladle by using carrier gas. According to the preparation process of the H08A steel, the section of a produced casting blank (8 hours of continuous casting) sample produced is free of any obvious bubbles, the central porosity grade is less than or equal to 0.5 grade, the central segregation grade is less than or equal to 0.5 grade, other obvious defects do not exist, and the percent of pass is 99%; and meanwhile, in the cross section of a steel body with the area of 100 * 100 millimeters, the number of inclusions is no larger than 30, and the maximum diameter of the inclusions is no larger than 20 micrometers.

The invention belongs to the technical field of clothes processing, and specifically provides an atomization device for clothes processing equipment, the clothes processing equipment, and a control method. The invention aims to solve the problem that an atomization piece of an atomization device in existing clothes processing equipment is easy to form dirt and affects the atomization efficiency. The invention provides the atomization device for the clothes processing equipment, the clothes processing equipment, and the control method. The atomization device comprises a shell and an atomizationmodule; an atomization cavity is arranged inside the shell; and the atomization module comprises an atomization piece that can atomize liquid in the atomization cavity, and a liquid inlet is set toward the atomization piece. The atomization device for the clothes processing equipment provided by the invention improves the atomization efficiency and the atomization amount, and improves the user experience.

The invention relates to choleresis increasing and gall-stone removal tea and a preparation method thereof. The choleresis increasing and gall-stone removal tea is prepared from the following raw materials in parts by weight: 4 to 20 parts of radix bupleuri, 12 to 28 parts of herba lysimachiae, 4 to 20 parts of radix curcumae, 12 to 28 parts of taraxacum, 12 to 28 parts of herba artemisiae capillariae, and 12 to 28 parts of endothelium corneum gigeriae galli. The process is simple, and by adopting the pure traditional Chinese medicine formula, the choleresis increasing and gall-stone removal tea has no toxic and side effect for the human body.

The invention discloses a hammer sheet crusher. The hammer sheet crusher comprises an upper body, a main motor arranged outside the upper body, a main shaft connected with the main motor, a sieve plate, hammer sheets, a rotating shaft moving cutter and an auxiliary motor, the hammer sheets are arranged on the main shaft, the sieve plate is arranged outside the hammer sheets and is arranged in the upper body around the main shaft, the auxiliary motor is arranged outside the upper body, the rotating shaft moving cutter is arranged in the upper body and parallels to the main shaft, and the rotating shaft moving cutter is connected with the auxiliary motor. How to improve the crushing capability of the crusher and destroy a circulation layer in the crusher is a technique problem to be solved. The hammer sheet crusher which adopts the rotating shaft moving cutter driven by the auxiliary motor increases the cutting force to a material and is in favor of destroying the circulation layer of the material in the crusher, so the crushing efficiency and the crushing quality are effectively improved.