246results about How to "Round shape" patented technology

The invention discloses a production method of fireproof middle and high voltage cables. The production method includes the following steps: sorting; wire drawing; annealing; conductor stranding; inner shielding layer, insulation layer and outer shielding layer co-extrusion and warping; metal shielding layer arranging; first wrapping tape layer lapping; cabling stranding and cabling wrapping tape layer lapping; oxygen isolation layer extrusion; package fireproof isolation layer extrusion; second wrapping tape layer lapping; metal armor layer lapping; third wrapping tape layer lapping and outer sheath layer extrusion. The middle and high voltage cables produced in the production method have good heat insulation effect when being paved on buildings, are improved in fireproof performance, can delay damage to a power system caused by fire disasters, natural disasters and other accidents, and gains time for rescue.

The method discloses a method for preparing an amlodipine microsphere. Medicament wrapped by the prepared amlodipine microsphere is amlodipine and organic acid salts of the amlodipine; a carrier material of the microsphere is polylactic acid (PLA), a polylactic acid-glycolic acid copolymer (PLGA), a polylactic acid-glycol block copolymer (PLA-mPEG) or other biodegradable materials; a surfactant solution, a monosaccharide or amylose solution, a polyalcohol solution, a cellulose solution and a colloid solution are used as a dispersion medium; and through an emulsion solvent evaporation method, the amlodipine microsphere is prepared under the mechanical stirring or high-speed shearing action. The microsphere has a round shape and even distribution of grain diameter; the grain diameter is within the range between 1 and 125 mu m; the medicine loading capacity can reach more than 1.5 percent; and the encapsulating rate is more than 70 percent.

The invention provides a device and method for preparing light alloy semi-solid slurry through air-cooling multi-tube stirring. The device comprises a crucible for containing light alloy melt, an air-cooling multi-tube stirring mechanism and a lifting mechanism. The air-cooling multi-tube stirring mechanism comprises a stirring mechanism body and an air supply mechanism. The stirring mechanism body is composed of a stirring motor, a multi-tube stirring rod and a bevel gear drive group which are arranged on a lifting platform. The multi-tube stirring rod is supported and positioned through a bearing. The air supply mechanism is composed of an air guide tube and an air supply device. One end of the air guide tube is combined with the air supply device, and the other end of the air guide tube is inserted into the multi-tube stirring rod. Multiple stirring pipes are filled with air entering the air guide tube. The device is simple in structure, convenient to use, high in efficiency, safe, reliable, wide in applicable scope in alloy and especially suitable for preparing large-volume semi-solid alloy slurry, the melt temperature, the stirring speed, the number of the stirring tubes, the inner diameter, the wall thickness, the stirring time and air ventilation quantity can be accurately controlled, and industrial application and popularization are facilitated.

The invention provides a lightweight car body structure, which comprises a core layer (300), a middle layer (200) and an outer layer (100), wherein the core layer (300) is a support framework which is made of aluminum magnesium alloy, the core layer (300) is of a hollow structure of which the section is in a circular, quadrilateral or hexagonal shape; the middle layer (200) is made of plastic, the middle layer is made into a rib structure through a 3D (three dimensional) print technology, and the rib structure is of a honeycomb structure, a mesh structure or a spatial cell body structure; the outer layer (100) is formed by adhering a carbon fiber sheet to the surface of the resin material. In the invention, the weight of the car body is reduced; the high-polymer carbon fiber material and the aluminum magnesium alloy are rationally applied to the structure design of the car body, and properly replace the previous sheet metal structure material; in the condition of guaranteeing the safe strength and rigidity property, the weight of the car body is reduced and the fuel consumption is reduced.

The invention relates to a regeneration method of casting wet type mixed old sand. The regeneration method comprises the following steps: preprocessing casting wet type mixed old sand; wiping with water; drying; preheating; roasting; and post-processing. In the invention, components, such as bentonite, coal dust and ashes, in wet type old sand are effectively removed by a water wiping process, and a residual resin film in mixed old sand is thoroughly decomposed by a roasting process. The regeneration cost is low, and the regeneration effect is great. Actual production and verification show that the performance indexes of regenerated sand reach or surpass those of new sand. The regeneration method is successively applied to the core making production of cold boxes and has remarkable economical and social benefits.

The invention provides a preparation method of (TiV)C steel bond hard alloy. Titanium and vanadium whose ratio is 1:1 are prepared, and a mixture and graphite powder are prepared into in-situ synthesized (TiV)C mixed powder, wherein the atomic mole ratio between C and Ti+V is 0.7-1.1; ferrovanadium powder, ferrochromium powder, ferromolybdenum powder, ferroboron powder, ferrous powder, ferrosilicon powder, ferromanganese powder, nickel powder, copper powder, colloidal graphite and a rare earth raw material are prepared according to a required mass ratio of bonded-phase metal chemical components, ball-milling is carried out by a steel ball, absolute ethanol as a medium and PVA (polyvinyl alcohol) are added, after the ball-milling is finished, slurry is dried and pressed for forming, and the steel bond alloy is obtained. In situ reaction synthesis technology and liquid phase sintering technology are combined, and the (TiV)C steel bond hard alloy is prepared. (TiV)C is synthesized in situ in a substrate through reaction in the sintering process, the fineness of particles is improved, no sharp angle is formed on the surface, and a substrate interface is relatively good in adhesion and clean. The comprehensive mechanical property of the alloy can be improved, the price is low, and the process is simple and convenient.

The invention relates to a process for roasting waste sand into a precoated sand material. The process comprises the steps of shakeout, magnetic separation, crushing, screening, magnetic separation, roasting, dedusting, cooling and storage. When crushed and magnetically separated sand is roasted, the sand is required to be fed into a preheater for preheating, and then is fed into a roasting furnace for roasting. A passage for bearing the sand is stepped when the sand is in the preheater, the sand in the stepped passage is in a flocculated flow state, and when the sand is roasted, natural gas is jetted from three direction-adjustable jet tips in the roasting furnace to process the sand. Before being roasted, the sand is required to be preheated, so that the high-temperature heat exchange time of the sand in the roasting furnace is short, and the roasting efficiency and the roasting quality are improved. The sand is roasted at high temperature by the natural gas, so that the generation of an inert gas during the roasting is avoided. In addition, the three adjustable natural gas jet tips are adopted, so that the sand can be uniformly heated when roasted.

The invention relates to the technical field of lost foam casting, and discloses a method and a device for regenerating casting sand of a lost foam casting production line. The device for regenerating casting sand comprises a sand falling and filling system, a dust removal cooling system, a sand selecting system, a sand conveyer system, a center sand bin, a middle sand bin, a control system and a dust removal system. The method for regenerating casting sand comprises the following steps: carrying out casting sand cleaning, dusting and cooling, sand selecting, and sand filling for molding on to-be-processed casting sand used in a casting procedure so as to obtain the regenerated casting sand. The method and the device are suitable for the lost foam casting production line with treasure sand as casting sand; the dust removal cooling system is compact in structure and high in cooling efficiency and has an energy-saving effect; the operations of sand falling and sand filling procedures are integrated into a system, so that the running efficiency of the system is obviously improved, and interference and restriction formed when the procedures cannot be synchronously performed are avoided.

A disk brake having a brake disk, a brake caliper including a bracket, a caliper housing and a brake lining. The bracket and the caliper housing engage axially around the brake disk, with the caliper housing and the brake lining movable in an axial direction. The caliper housing has outer housing limb comprising two housing fingers which run substantially in a radial direction and which span a limb window situated between them and which is open in the direction of the rotational axis, with the housing fingers having one end section facing the rotational axis. A protective screen covers end sections of the housing fingers and conceals a section of the limb window that faces the rotational axis, with an outer dimension of the protective screen in a circumferential direction such that a transition between the protective screen and the housing fingers is substantially stepless in an axial projection.

The invention relates to a novel preserved fruit food and the production method, which adopts fresh cherry tomato(also be known as: fruit tomato and cherry tomato), after the processes of sugar making and saccharifying, the cherry tomato preserved fruit is made. The shape of the product is round; the color is red; the product is soft and non-stick; the sweet and sour is appropriate; the taste is fresh; thereby the invention adds a new product for the preserved fruit conserved fruit family, and has better nutritional value, and provides a deep processing way for the current booming cherry tomato plant industry.

The present invention relates to an enrofloxacin gelatin microsphere and its preparation method. It is characterized by that it uses type A gelatin as carrier, uses enrofloxacin as medicine to be carried and adopts an emulsification-condensation process to prepare the invented gelatin microsphere which can take the lung as target organ after intravenous injection. The average grain size of said microspheres is 12 micrometers.

The invention discloses a preparation method of a micron-sized monodispersed porous silica microsphere. A novel porous polysilsesquioxane microsphere is taken as a template, direct calcinations is conducted for removing organic components, and thus a monodispersed porous silica microsphere material with the controllable particle size and hole diameter. The invention further discloses the micron-sized monodispersed porous silica microsphere prepared through the preparation method, the particle size of the silica microsphere is 3-10 [mu]m, the pore volume is 0.3-0.9 cm<3> / g, the specific surface area is 100-400 m<2> / g, and the hole diameter is 3-100 nm. Compared with a traditional process, the preparation method is simple, the economical effect is achieved, graded screening is not needed, and the prepared porous silica microsphere is round and normal in shape and uniform in particle size distribution, has a mesoporous structure, can be directly applied to high performance liquid chromatography stationary phases, and can also be applied to the fields such as catalytic carriers, coating and cosmetic additives.

The invention belongs to the field of preparation of targeted therapeutic microspheres of slow release formulation and in particular relates to a preparation method of taxol-loading polylactic acid-hydroxyacetic acid (PLGA) microspheres. The preparation method comprises the following steps: dissolving a polylactic acid-hydroxyacetic acid copolymer in an organic solvent, and adding a taxol drug, wherein the polymer and the taxol drug are uniformly dissolved to obtain an organic phase; dropwise adding the organic phase into a fresh polyvinyl alcohol aqueous solution and curing and forming microspheres; and performing centrifugal separation on the cured drug-loading microspheres to obtain the uniformly dispersed taxol-loading polylactic acid-hydroxyacetic acid (PLGA) microspheres. The taxol-loading targeted therapeutic PLGA microspheres prepared by the preparation method have an ideal drug loading ratio and encapsulation efficiency while guaranteeing the drug stability of taxol, can reach an effect of slow release, maintain the optimum drug concentration in vivo, prolong the action time of the drug and reduce the side effects brought by burst release of the drug, and have important theoretical value and actual application prospect.

An improvement of three cores high voltage lifting cable of high-rise building is adopting single core insulating cables and between them filled by three carrying steel cores with insulating coat of arc sector section. They cross into cable and outside is pricked by high-intensity strap. The arc sector bearing touches with closed cable core with large acreage and this enhances the friction of them greatly. For the crossing and strap, it increases the friction between them and greatly enhances the whole tensile strength of cable to endure more strength and is suit for lifting 150 meters or higher construction. It also increases current capacity of cable about 10-30% and reduces the weight of cable about 20-30% to cut down the cost. The arc sector bearing gives more little side pressure to cable and the cable is safe with good reliability. The absolute structure of three cores bearing reduces the difficulty of production.

The invention relates to the technical field of a method for manufacturing composite grain rolls, in particular relates to the method for manufacturing modified-type chromium-nickel-molybdenum indefinite chilling composite grain rolls, which comprises raw material preparation, hot metal melting and modification treatment, frock preparation of roll neck die, cooling unpacking, heat treatment, and inspection of process. The method comprises firstly, smelting respectively outer-layer melted iron and nodular graphite cast iron which is on a core-portion after preparing raw materials, adding strengthening carbide to form elements M and N when the outer-layer melted iron is smelted, and forming the melted iron of chromium-nickel-molybdenum iron which is carbonized and strengthened, secondly, deteriorate-treating the melted iron of chromium-nickel-molybdenum iron which is carbonized and strengthened, and globalizing and inoculating the melted iron of the nodular graphite cast iron on the which is the a core-portion, thirdly, casting the outer layer of the melted iron of the chromium-nickel-molybdenum iron which is carbonized and strengthened with a centrifugal pressure casting method, and box-combining with rolling dies which are prepared by carpenters, and fourthly, re-casting the melted iron of nodular graphite cast iron with a static state casting method. The millimeter rolled steel quantity of rolls of the invention can be increased by over 20% compared with traditional chromium-nickel-molybdenum indefinite chilling composite grain rolls.

The invention discloses a manufacturing method of safety fire-resistant medium and high voltage cables. The manufacturing method includes steps of selecting, drawing, annealing, conductor stranding, coextruding and covering of inner shield layers, insulating layers and outer shield layers, setting metal shield layers, isolated-phase extruding of fire-resistant isolated layers, lapping of first tape layers, cabling stranding and cabling tape lapping, extruding of oxygen isolating layers, extruding of fire-resistant isolating layers, lapping of second tape layers, lapping of metal armor layers, lapping of third tape layers and extruding of outer sheath layers. The medium and high voltage cables manufactured by the method have good heat insulation effect when laid on buildings, fire resistance of the cables is improved greatly, damages to an electric power system due to accidents such as fires and natural disasters can be delayed, and time can be gained for rescue work.

The invention provides a single crystal lithium nickel cobalt manganate precursor and a preparation method thereof. The preparation method comprises the following steps: preparing a mixed salt solution, a precipitant solution and a complexing agent solution, and introducing a mixed gas of oxygen and non-oxygen in a volume ratio of 1:19-1:29 into a reaction kettle at a flow rate of 7-20 L / min; adding the mixed salt solution, a sodium hydroxide solution and an ammonia water solution at a flow rate of 60-120 ml / min for reaction; and keeping the pH value at 10.0-11.0, a temperature at 30-60 DEG Cand a stirring rotating speed at 100-500 rpm to obtain the single crystal lithium nickel cobalt manganate precursor, wherein the thickness of the primary particle sheet layer is 100-200 nm, the particle size D50 is 3.0-4.0 [mu]m, and the particle size distribution (D90-D10) / D50 is less than or equal to 0.8. According to the invention, the secondary particle size D50 of the precursor prepared by the method is 3.0-4.0 [mu]m, and the particle size distribution is not more than 0.8; and the single crystal lithium nickel cobalt manganese oxide particles prepared by the precursor are narrow in particle size distribution and good in high and low temperature performance.

The invention provides a molecular specificity mark primer for authenticating mushroom strains 241 and 241-4 and a detecting method for differentiating and authenticating the mushroom strains 241 and 241-4 by using same. The sequence of an upstream primer is 5'-GGTTCTGCTCCTTGTGACTG-3', and the sequence of a downstream primer is 5'-TCTGCTCTTCAGATGCAAGCT-3'. Compared with convectional morphology detection, antagonism tests and fruiting tests, the invention has the advantages of short detection time and high accuracy. The detection time in the method is only 1 to 2 days, but the time of the convectional antagonism tests is at least two weeks, and the time of the fruiting tests is at least three months.

The invention discloses a production method for conductors for fire-resistant middle-high voltage cables. The method includes steps of material selection, wire drawing, annealing, conductor hinging, co-extrusion and coating of an inner shielding layer, an insulation layer and an outer shielding layer, setting of a metal shielding layer, extrusion of a phase-separation fire-resistant insulation layer, winding of a first wrapping tape layer, cabling twisting and winding of cabling belting layer, winding of a metal armored layer, winding of a second wrapping tape layer and an outer sheath layer extrusion, wherein during the extrusion of the phase-separation fire-resistant insulation layer, ceramic silicon rubber materials are extruded on the metal shielding layer through a silicon rubber extruder, and the extruding thickness is 2.0mm-4.0mm. According to the method, the phase-separation fire-resistant insulation layer is arranged, the silicon rubber extruder is used for extrusion of the ceramic silicon rubber materials, therefore the materials are provided with good thermal insulating effect, ceramic bodies are fired by flames at a high temperature and provided with a certain mechanical strength and good electrical insulation performance due to the fact that the major material is inorganic silicon, so that the fire-resistant performance of the cables can be improved.

The invention discloses mesoporous hemostatic particles having antibacterial properties and their preparation method and use. The mesoporous hemostatic particle comprises silver and mesoporous silica and silver is uniformly distributed in the skeleton of the mesoporous silica. The mesoporous hemostatic particles having antibacterial properties are spherical and have an average particle size of 450-700 micrometers. By self-assembling and modeling effects of a surfactant, a silver source and a silicon source as raw materials are subjected to a sol-gel process to form sol, the sol is aged and dried to form silver-containing silica xerogel powder, the xerogel powder and an assistant are mixed, a binder is sprayed on the mixture, the mixture is subjected to granulation, and the hemostatic particle blanks are subjected to sintering setting to form the mesoporous hemostatic particles having antibacterial properties. The mesoporous hemostatic particles having antibacterial properties can be directly used or be used after being put into a non-woven fabric bag, and has the advantages of good hemostatic effects, no agglomeration, no flying dust, low hygroscopicity, operation easiness, storage easiness, carrying easiness, low cost and process simpleness.

The invention discloses a method for preparing a recombinant human endostatin sustained release microsphere. In the method, recombinant human endostatin is solved in buffer solution containing protein stabilizer to obtain an inner water phase; lacto-glycolic acid copolymer is solved in mixed organic solvent to obtain an inner oil phase; the mixed solution of the inner water phase and the inner oil phase is dispersed fast to obtain primary emulsion; the obtained primary emulsion is arranged in a stirring vessel which is filled with plant oil or mineral oil containing emulsifier to be stirred into water-in-oil type compound emulsion; the water-in-oil type compound emulsion is stirred continuously to volatilize the mixed organic solvent in the inner oil phase and then is filtered and separated by a microporous filtering film after the microsphere is solidified; the residual plant oil or mineral oil on the surface of the microsphere is washed by the solvent; and the microsphere finished product is obtained after vacuum drying. The microsphere prepared by the method has high drug loading quantity, high entrapment rate, proper burst release quantity and long sustained release period.

The invention discloses a method for preparing metallic hollow microsphere powder. In the method, a molding device is used for implementing according to the steps of vacuum-pumping, heating and smelting, active aerification, hollow spheroidization and the like. The molding device comprises a large vacuum chamber communicated with a deflation valve and a vacuum pump, the large vacuum chamber is internally provided with a copper roller and a high frequency induction coil, the high frequency induction coil is internally provided with a crucible, a lower end nozzle is aligned with the face of the copper roller, the large vacuum chamber is connected with a small vacuum chamber, the opening of the crucible is communicated with the small vacuum chamber, and an additional passage is arranged between the large vacuum chamber and the small vacuum chamber; the small vacuum chamber is communicated with a mixing chamber, and the mixing chamber is respectively communicated with a hydrogen tank and an argon tank. In the method of the invention, the alloy melt is treated by active aerification, and the melt containing gas is treated by sharp quenching for fast solidification to obtain metallic hollow microsphere powder which is of intact sphere shape and contains no mesoporous, and the sphere shell solidified tissue has the feature of fast solidification; the method is simple in process, convenient in operation and low in cost.

The invention belongs to the technical field of medicine, and relates to a nanoparticle containing EV71VP1 protein and a preparation method of the nanoparticle. Specifically, the invention relates to a nanoparticle containing EV71 VP1 protein, an immunologic adjuvant, a cationic polymer and an anionic polymer, wherein the immunologic adjuvant is selected from one or more of TNF-alpha, CpG, bcg vaccine and flagellin. The invention further relates to a method for preparing the nanoparticle including immunogenic composition (such as vaccine) of the nanoparticle. The nanoparticle is used for preparing the immunogenic composition (such as vaccine) and for the nanoparticle or the immunogenic composition (such as vaccine) to initiate or enhance the immune response of subjects to EV71.

The invention relates to a cable for petroleum exploration and a manufacturing method thereof; ethylene-propylene rubber insulation layers are extruded outside core wire conductors to form insulated core wires; one insulated core wire is arranged in the center, six insulated core wires are arranged on the periphery and are regularly twisted into a cable core, and yarns are filled in gaps among the insulated core wires; and a rubber cloth tape wrapped layer is arranged on the periphery of the cable core, a polyester tape wrapped layer is arranged on the periphery of the rubber cloth tape wrapped layer, a chlorosulfonated polyethylene sheath is extruded on the periphery of the polyester tape wrapped layer, and a galvanized steel wire double-layer braided armor layer is arranged on the periphery of the chlorosulfonated polyethylene sheath. The cable has a round shape, high tensile strength and excellent insulation performance and mechanical performance, the pulling strength can reach 60000N, and the operation depth reaches a 7000m deep well; the insulation resistance among the insulated wire cores of the cable as well as the insulation resistance between the insulated wire cores and armors are no less than 800Momega.km; and no breakdown occurs after a 5000V voltage withstanding test is performed for continuous 5min, and the sheath does not deform after a wear resistant test for 125 weeks is performed.

The invention belongs to the field of preparation of self-repairing microcapsule materials and relates to a multifunctional microcapsule used for self-repairing of materials and a preparation method thereof. The microcapsule is prepared with ethyl cellulose being a wall material and epoxy resin adhesive being a core material and includes, by mass, 0.7 to 7.4 parts of epoxy resin, 0.6 to 5.6 partsof an emulsifier, 0.7 to 2.5 parts of ethyl cellulose, 12.7 to 27.8 parts of an organic solvent, and 59.2 to 84.1 parts of deionized water. The multifunctional microcapsule has a round appearance andhas a plurality of penetrating and uniform pores thereon. What is the multifunctionality of the microcapsule is the microcapsule can achieve self-repairing of the materials through two releasing modeof diffusion release of pores in the wall material and / or breaking release of the wall material. The multifunctional microcapsule is green and pollution-free. The preparation method is simple and is easy to industrialize.

Technical scheme is as following: single sided aluminum foil layer wraps on two pieces of power line and two pieces of data signal line of the USB connection wire; metallic braid layer wraps the said aluminum foil layer; and plastic outer covering layer wraps the metallic braid layer; two pieces of data signal line, and ground wire setup in parallel are wrapped inside single sided aluminum foil layer; two pieces of fiber glass packing is in same layer of the two pieces of power line outside the single sided aluminum foil layer. The fore mentioned structures are inter twisted each other. Material of insulating layer for power lines and data signal lines is FEP. Material of plastic outer covering layer is fire resistant. Fabricating steps: inner wrapping; inter twisting; outer wrapping; weaving metal layer; sending out. Features are: high transmission rate and anti-electromagnetic interference, useable to high / low temperature, and acid / alkali condition.

The invention provides a heterojunction cell texturing and washing method. The shape of the top and the bottom of a textured-surface pyramid formed by the method is more rounded; the passivation effect of amorphous silicon is improved under the condition that the reflectivity is not influenced. The heterojunction cell texturing and washing method is characterized by texturing a silicon wafer and washing the textured surface of the silicon wafer by using a mixed solution of hydrofluoric acid and nitric acid. Preferably, the heterojunction cell texturing and washing method successively comprises the following steps: S1, washing the silicon wafer for a first time; S2, removing damage of the silicon wafer and texturing the silicon wafer; S3, washing the silicon wafer for a second time; S4, treating the textured surface of the silicon wafer by using the mixed solution of hydrofluoric acid and nitric acid; S5, washing the silicon wafer for a third time; S6, washing the silicon wafer with acid; and S7, drying.

The invention relates to the technical field of manufacture of cables for marine engineering equipment, and specifically refers to a power cable for marine engineering equipment and a preparation technology thereof. The cable comprises a cabling wire core which is formed by stranding a plurality of insulated wire cores. Each insulated wire core comprises a cable conductor formed by stranding a plurality of tinned copper wires, the cable conductor is wrapped with a fireproof layer, and the fireproof layer is wrapped with an insulating layer. The outer layer of the cabling wire core is provided with an oil-resistant inner sheath layer, and a filling rope is arranged between the oil-resistant inner sheath layer and the insulated wire cores. The outer layer of the oil-resistant inner sheath layer is provided with a braided armoring layer, and an oil-resistant outer sheath layer is arranged outside the braided armoring layer in an extruding manner. The power cable for marine engineering equipment disclosed by the invention has the characteristics of compact structure, high mechanical strength, flame retardancy, ultraviolet resistance, fireproofing, high oil resistance, and no pollution after combustion. Because of the improvement of the preparation technology, the overall mass of the cable is reduced and optimized obviously, and the distortion resistance of the cable is improved greatly.