290results about How to "The process steps are simple" patented technology

The invention discloses a manufacturing method of an aluminum alloy hub. The manufacturing method comprises the following steps: step 1, preparing materials; step 2, preheating; step 3, forging and pressing; step 4, spinning; step 5, performing stabilizing treatment; step 6, performing mechanical processing and surface treatment. The manufacturing method can be used for reducing the blank preheating time and omitting a solid dissolving and aging thermal treatment process; the product is high in yield and stable in mechanical performance, the energy consumption can be obviously reduced, and the production efficiency is improved. The aluminum alloy hub manufactured by virtue of the method has better mechanical performance and higher tensile strength, yield strength and elongation, and can completely achieve various performance requirements of the hub.

The invention provides a dual-waveband photoelectric detector and a preparation method thereof. The dual-waveband photoelectric detector comprises a semiconductor substrate, an infrared wavelength detecting part which is positioned on the semiconductor substrate and provided with an active area for ion injection, an ultraviolet wavelength detecting part which is positioned on the infrared wavelength detecting part, and an electrode leading-out pole for the infrared wavelength detecting part and the ultraviolet wavelength detecting part. The ultraviolet wavelength detecting part comprises a graphene layer which is positioned on the active area of the infrared wavelength detecting part, an ultraviolet sensitive quantum dot layer which covers the graphene layer. According to the dual-waveband photoelectric detector disclosed by the invention, infrared and ultraviolet dual-waveband detection can be performed, and the infrared wavelength detecting part and the ultraviolet wavelength detecting part are integrated, so that the process steps are simplified, and the cost is reduced; moreover, the graphene and the ultraviolet sensitive quantum dots are utilized as the ultraviolet wavelength photosensitive materials, and the forbidden band of the quantum dot can be regulated according to the dimension of the quantum dot and is quick in response speed, so that the ultraviolet waveband detection is adjustable and relatively sensitive.

The invention discloses a preparation method of a Cu-Nb multi-core composite wire with the rectangular cross-section, which comprises the following steps: firstly, carrying out first extrusion assembly and drawing for a single pure Nb rod and a first outer oxygen-free copper sheathing; secondly, carrying out second extrusion assembly and obtaining a first Cu-Nb multi-core composite filament; secondly, according to the extrusion assembly method and related process parameters in the step 2, repeatedly carrying out third extrusion assembly; thirdly, according to the extrusion assembly method and related process parameters in the step 2, repeatedly carrying out fourth extrusion assembly; and finally, setting and drawing by a rectangular mold. The invention has simple process step, short process, high production efficiency, low preparation cost and good use effect, and the produced Cu-Nb multi-core composite wire has superior performance; and the invention is suitable for mass production, can better control the dimensional accuracy of the rectangular cross-section, and can machine any size and length of hundred-million-magnitude-order Cu-Nb multi-core composite wires with the rectangular cross-section.

The invention discloses an ingot casting method of granular polysilicon. The method comprises the following steps: firstly, charging: putting the granular polysilicon into a crucible as silicon ingot casting materials; secondly, preheating; thirdly, melting, wherein the melting process comprises the following steps: step 1, carrying out heat preservation; steps 2 to 5, heating and implementing pressurization; step 6, raising temperature for the first time and keeping pressure, namely raising the temperature to T3 which is equal to 1450 DEG C; step 7, raising the temperature for the second time and keeping the pressure, namely raising the temperature to T4 which is equal to 1500 DEG C; step 8, raising the temperature for the third time and keeping the pressure, namely raising the temperature to T5 which is equal to 1550 DEG C, wherein temperature rise times from the step 6 to step 8 are all 260 to 300 minutes; step 9, carrying out heat preservation; step 10, continuously carrying out the heat preservation; fourthly, growing crystals; fifthly, annealing and cooling. The method disclosed by the invention is simple in steps, reasonable in design, convenient in realization, easily mastered, and good in use effect. Furthermore, ingot casting products with high conversion efficiency can be manufactured by using the low- cost granular polysilicon, thereby achieving the purposes of reducing wastes and lowering cost.

The invention provides a preparation method of silver coated copper powder for electronic slurry, which comprises the following operation steps of: (1) adding a certain mass of copper powder raw materials into a reaction container, adding acid solution, carrying out ultrasonic stirring for 5 to 15 min, filtering materials, and collecting filter residue; (2) weighing a proper amount of complexing agents, adding the complexing agents into deionized water, then, adding copper powder after acid washing, carrying out stirring dispersion, and obtaining reducing liquid; (3) weighing a proper amount of silver nitrate, adding the silver nitrate into the deionized water, adding ammonia water, stirring the solution until the solution is transparent, and obtaining silver-ammonia solution; (4) adding the silver-ammonia solution into the reducing liquid for taking reaction under the dispersion stirring of an ultrasonic dispersing device; and (5) filtering the solution after the reaction, washing the filter residue by the deionized water and/or absolute ethyl alcohol, carrying out vacuum drying, and obtaining the product of the silver coated copper powder for the electronic slurry. The preparation method has the advantages that the raw material ingredients are simple, the technical steps are simple, the preparation method can be used for large-scale production, and in addition, a silver layer can not be deposited on the surface of the reaction container.

The invention discloses a silicon-carbon composite material for a lithium ion battery, a preparation method of the silicon-carbon composite material, and a lithium ion battery anode material and the lithium ion battery, which are prepared from the silicon-carbon composite material. The silicon-carbon composite material comprises a porous carbon matrix material with pores and nano silicon particles composited among the pores of the porous carbon matrix material. The particle diameter of each nano silicon particle in the silicon-carbon composite material is 5-100 nm, wherein the content of nano silicon is 10-90 wt%. The silicon-carbon composite material has a simple manufacturing process and is capable of obviously reducing a volume effect of a silicon-containing active substance in the process of being intercalated and de-intercalated with lithium, improving a diffusion behaviour of lithium in an active material and increasing the specific capacity of the lithium ion battery. The battery anode material prepared from the composite material has a good conductivity property. The prepared lithium ion battery has a good cycling property.

The invention relates to a method for extracting scandium, belonging to the field of metallurgy. The invention solves a technical problem of providing the method for extracting the scandium, which has the advantages of high scandium reclamation rate and low cost and can meet the requirement of industrial production. The method for extracting the scandium comprises the following steps: a, chloridizing a scandium-containing raw material to obtain chlorination residue; b, leaching the chlorination residue in a leaching solution to ensure that the scandium is completely dissolved in the leaching solution, and filtering the solution to obtain filtrate; c, extracting the filtrate by adopting extracting agent CA-100, namely sec-nonylphenoxy acetic acid, and separating the filtrate to obtain organic phase; d, back extracting the organic phase by adopting NaOH solution, filtering the solution to obtain Sc(OH)3 precipitate; and e, dissolving the Sc(OH)3 precipitate by using HCl solution, adding oxalic acid solution after the solution is heated and boiled, filtering the solution to obtain scandium oxalate precipitate, and calcining the scandium oxalate precipitate to obtain scandium oxide. The method provides a new option for scandium extraction, and has wide application prospect.

The invention discloses a method for dispersing a complex conducting agent in an electrode slurry for a lithium ion capacitor. The method comprises the following steps: (1) material weighing: weighing 0.5-14.5% of graphene, 5.5-14.5% of a carbon nano tube and the balance of conducting carbon black, weighing N-methylpyrrolidone which is 4-9 times of the mass of the complex conducting agent, and weighing a surfactant which accounts for 5-15% of the mass of the complex conducting agent, wherein the grapheme, the carbon nano tube and the conducting carbon black constitute the complex conducting agent, and all the materials are weighed for standby application; (2) step-by-step material adding for dispersion: mixing the complex conducting agent with N-methyl-pyrrolidone and the surfactant for ultrasonic dispersion firstly, adding the carbon nano tube for first high-speed dispersion secondly, and adding the grapheme for second high-speed dispersion finally. The method is simple in process sequence, high in operability, and suitable for industrialized production, and has the advantages that the complex conducting agent can uniformly disperse to form a three-dimensional conducting network structure, and the power performance can be obviously improved when the relatively high energy density of capacitance is retained.

The invention discloses a melamine-formaldehyde dipping resin which consists of 34-45 percent of formaldehyde, 30-40 percent of melamine, 1-4 percent of diethylene glycol, 12-28 percent of purified water, 1-4 percent of modifying agent and sodium hydroxide according to weight percentage; the invention further discloses a preparation method of the melamine-formaldehyde dipping resin. Caprolactam is omitted in the raw material formulation; by changing the formulation of raw material composition, each performance index of the polymer resin, which is finally generated, meets each index requirement of the dipping resin; when the dipping resin is used for manufacturing laminated flooring, the detected performance indexes of the flooring also meet the quality index requirements. As the caprolactam is omitted in the raw material formulation, production cost is greatly saved and process steps are simplified.

The invention firstly aims at providing a C-direction sapphire polishing solution. The C-direction sapphire polishing solution comprises silica sol, an auxiliary polishing agent, a complexing agent, oxidant, surfactant, humectant, a pH adjusting agent and water. The C-direction sapphire polishing solution has the advantages that the wafer surface is oxidized into a soft oxidation layer through the oxidant; the soft oxidation layer formed on the wafer surface is removed through the silica sol, and polishing efficiency is improved; roughness of the wafer surface is lowered through the auxiliary polishing agent; contamination of impurity irons is reduced through the complexing agent; the surfactant facilitates cleaning and removal; crystallization generated in the polishing process is greatly reduced through the humectant; the PH value of a polishing solution system and chemical action in the polishing process are adjusted through the pH adjusting agent. The invention secondly aims at providing a preparation method of the C-direction sapphire polishing solution. The C-direction sapphire polishing solution and the preparation method thereof have the advantages that the process steps are simple, the process parameters are easy to control, and the C-direction sapphire polishing solution and the preparation method thereof are suitable for mass production.

The invention belongs to the technical field of micro and nano fibers prepared by electrostatic spinning, and relates to a method for preparing a conductive polymer micro and nano fiber array of an ordered coaxial structure by adopting a rotary disk collecting electrostatic spinning technology, in particular to a method for preparing ordered coaxial structural micro and nano fibers. The method comprises the following steps of: covering a flexible plastic substrate with a rectangular slit shape on a collector of a rotary disk type electrostatic spinning device, and obtaining ordered micro and nano fibers by using transverse relative motion of the collector and high-speed moving electro-spun fibers; and treating the ordered micro and nano fibers serving as a template by a chemical wet method, wrapping a layer of conductive polymer on the surface of the fiber template by in-situ polymerization, and thus obtaining the conductive polymer micro and nano composite fibers of the ordered coaxial structure. The method is high in ordered arrangement degree of the fibers, simple in process, reliable in principle and easy to operate; and the fibers have high electric conductivity and wide application range.

The invention discloses a method for extracting and separating components of an osmanthus flower or an arabian jasmine flower. The method comprises the following steps: picking up fresh flowers, removing obvious impurities; storing and extracting by using edible 95% ethanol, filtering to obtain a fresh flower alcohol extract; concentrating the fresh flower alcohol extract by using a vacuum absorption method; absorbing high-volatility components which are extracted together with gaseous ethanol during concentration by adopting an adsorbent; recovering the gaseous ethanol by a cold well behind the adsorbent; forming fresh flower extractum by using vacuum concentrated components; extracting the adsorbent absorbing the high-volatility components of the fresh flowers by using a supercritical CO2 extraction technology, so as to obtain fragrance volatile essential oil of the fresh flowers; separating the fresh flower extractum by using a molecular distillation technology, so as to obtain medium volatile absolute oil and high-volatility balm of the fresh flowers. By adopting the method, the components of the osmanthus flower or the arabian jasmine flower can be obtained, so that the method is simple in technological steps and environment-friendly, the problem that easy-to-loss fragrance volatiles when the solvent is recovered is overcome by using a vacuum absorption method in a concentrating manner, a residual solvent is avoided by using the supercritical CO2 extraction technology and the molecular distillation technology, and the raw materials are high in utilization rate.

The invention relates to a process for treating flax rough yarn. The prior sub-oxygen bleaching chemical degumming processes have complex flow, large water usage, large energy consumption, highly toxic substances in the chloride bleaching waste water and high pollution to environment. The process comprises the following reaction steps: step one, boiling-off and oxygen-bleaching, namely adding sodium hudroxide, hydrogen peroxide, sodium silicate, calcined soda, osmotic agent, carbonyl diamide, sodium tripolyphosphate and sodium sulfite into water, and heating and boiling off the mixture; step two, washing by water, namely washing the mixture once or twice by hot water and twice or thrice by cold water, and washing the mixture by overflow; step three, washing by acid, namely using acetic acid and adding the osmotic agent into the acetic acid; step four, washing by water, namely washing the mixture twice or thrice by cold water, and washing the mixture by overflow; and step five, soft treatment, namely adding alkyl silicon composite RS into the water. The process adopts the method of combining carbomite and the hydrogen peroxide to replace sodium chlorite which is a toxic bleaching agent, is favorable for environmental protection, improves whiteness of yarns at the same time, and reduce production cost.

The invention relates to the technical field of animal feed processing, and particularly discloses a preparation method of feather protein powder. The preparation method of the feather protein powder takes chicken feathers as a raw material, and is characterized by comprising the steps of carrying out pretreatment on the chicken feathers, and grinding into feather powder; putting the feather powder into a container, and feeding distilled water into the container, wherein 0.015-0.0525g of keratinase or 0.050-0.175g of neutral protease is fed into 1g of feather powder; adjusting the pH value to be 6-8.5, and carrying out enzymolysis for 4-48 hours at the temperature of 35-60 DEG C; and filtering enzymolysis reaction liquid, and taking out the filtrate which is the product. The preparation method is simple in processing steps and less in cost and investment; the product is high in purity; the product can be processed into amino acid products and feed additive protein, thus being relatively wide in application and suitable for wide popularization and application.

The present invention relates to pharmaceutical technology, and is especially high purity material medicine preparation process. The preparation process of high purity breviscapine B material medicine consists of the following steps: 1. setting breviscapine in some container, adding 2 times or more water, adding alkali metal phosphate to regulate pH to 4-8 for dissolving completely; 2. adding 3 times or more solvent for depositing, letting stand, filtering and washing the precipitate with solvent; and 3. shifting the precipitate to solution with 10-60 wt% of solvent, adding acid to acidify to pH 2, filtering precipitate, water washing to neutrality, and drying to obtain high purity breviscapine B material medicine.

The invention relates to a preparation method of an electrolyte for a vanadium redox battery (VRB), wherein the electrolyte for the VRB is prepared by means of an electrolytic process, the electrolyte for the VRB prepared by means of an electrolytic process is a quadrivalent vanadium ion solution, and the preparation method comprises the following basic steps: 1) preparing a mixed solution composed of sulfuric acid and vanadium sulphate, adding vanadium pentoxide powder into a 98% sulfuric acid solution, then heating and stirring, and then diluting with distilled water to prepare a mixed solution comprising sulfuric acid and vanadium sulphate; 2) filtering the mixed solution comprising sulfuric acid and vanadium sulphate to remove a small quantity of insoluble vanadium pentoxide to obtain a mixed solution comprising sulfuric acid and vanadium sulphate, wherein the mixed solution can meet the requirements for the preparation of the quadrivalent vanadium ion solution; and 3) pouring the mixed solution comprising sulfuric acid and vanadium sulphate into an electrolytic cell without a diaphragm to electrolyze to obtain a quadrivalent vanadium ion solution. The preparation method provided by the invention has the advantages that the preparation cost is reduced and the process is simple.

The invention aims at disclosing a thin-film pressure sensor adopting titanium oxynitride as a strain material and a manufacturing method thereof. The thin-film pressure sensor comprises a stainless-steel elastic substrate, wherein the stainless-steel elastic substrate is provided with a core body thin-film layer; the core body thin-film layer comprises an insulating layer, a strain resistance layer, an electrode, a temperature-measuring resistance layer and a passivating layer; and the insulating layer, the strain resistance layer, the electrode, the temperature-measuring resistance layer and the passivating layer are deposited on the stainless-steel elastic substrate by a vacuum deposition method. Compared with the prior art, the invention has the advantages that a core body of the thin-film pressure sensor prepared by using thin film as the strain resistance layer has good heat stability, low cost and high production efficiency, measurement of temperature and pressure parameters can be realized simultaneously, the core body is suitable for use under high-temperature and severe environments, and the purpose of the invention is achieved.

The invention discloses an injection molding process, which comprises the following steps of (a) waste crushing; (b) waste screening; (c) waste and raw material mixing; (d) drying treatment; (e) heat-preservation treatment; (f) injection molding system pretreatment; (g) injection molding mould pretreatment; (h) raw material plasticization; (i) raw material injection; (j) pressure preservation; (k) cooling molding; and (l) de-molding. The process comprises simple steps, and is convenient to implement, raw materials are saved, the cost is lowered, a molding cycle is shortened, and the machine efficiency and the automation degree are improved.

The invention provides a process for preparing an atomic force microscope needlepoint by using single carbon nano tube. The process comprises the following steps of: depositing a metal nanoparticle on the microscope needlepoint by an electrochemical reduction method, placing the microscope needlepoint on which the metal nanoparticle is deposited upward, and performing fixed-point and oriented growth on the single carbon nano tube on the microscope needlepoint by a plasma enhanced chemical vapor deposition method. The obtained atomic force microscope needlepoint assembled with the single carbon nano tube can be used for atomic force microscope imaging.

The invention discloses a processing method for deodorized soybean milk. The processing method includes the steps of (1), soaking, (2), grinding, (3), centrifugation for dregs removal, (4), boiling, (5), vacuum degassing, (6), high-pressure homogenization and (7), sterilizing and packing. The processing method for the deodorized soybean milk has the advantages that process steps are simple, operability is high, beany flavor of soybean milk can be eliminated thoroughly without production efficiency reduction, production cost increase and soybean protein modification enhancement, product flavor and taste can be improved, acceptability of customers is greatly improved, and accordingly, the processing method has high promotion and application value.

The invention provides a high-efficiency N/P flame retardant, as well as a preparation method and application thereof. The method comprises the following steps: firstly performing condensation reaction of 4,4'-diaminodiphenylmethane (DDM) with aromatic aldehydes, and then adding DOPO into the resulting mixture for reaction, to obtain the N/P flame retardant. The flame retardant has higher activity, can promote curing of epoxy resins, and is added to epoxy resin for curing to form a cured epoxy product which has higher flame retardancy. When the phosphorus content of the cured epoxy system reaches 1.0 wt% to 1.5 wt%, the vertical combustion level reaches the grade UL94V-0, the limited oxygen index reaches 37.8-41.2, and the char yield reaches 22.1%-24.9% at 800 DEG C.

The invention provides a preparation method of a thermosetting type composite adhesive, which comprises the steps of preparing polyester polyol and preparing thermosetting composite adhesive, wherein the polyester polyol is prepared through primary esterification, secondary esterification and condensation polymerization; dimethyl terephthalate (DMT) and diglycol are added to a polyester synthesis kettle to carry out the primary esterification; dimeric dibasic acid, m-phthalic acid, nonane diacid and 1,3-butanediol are added to the polyester synthesis kettle in which the primary esterification reaction is finished to carry out the secondary esterification; low vacuumizing, high vacuumizing and long vacuumizing are sequentially carried out for the polyester synthesis kettle in which the secondary esterification is finished, and the polycondensate generated after the condensation polymerization is the polyester polyol; the thermosetting composite adhesive is prepared by mixing evenly the prepared polyester polyol, enclosed type isocyanate tripolymer, a component solvent, titanic acid ester chelon, tackifying resin and plasticizer. The thermosetting type composite adhesive prepared by the method has excellent bonding intensity when used for bonding PVC and an armor plate without chemical treatment for the surface.

The invention discloses a method for preparing amoxicillin or ampicillin in a full-water-phase through mode. The method includes the steps that a high-concentration penicillin GK or penicillin VK extracting solution is used as a raw material, immobilized penicillin G acylase or penicillin V acylase is used as an enzyme catalyst, a high-concentration 6-APA solution or crystal is obtained through full-water-phase operations such as catalytic cracking, separating, acidization, filtering, chromatography and concentration by nanofiltration, and then the amoxicillin or the ampicillin is synthesized by the solution or crystal and HPGME or phenylglycine methyl ester under the catalytic action of the immobilized penicillin synthetase. According to the method, water-phase reacting is conducted in the whole process, no organic solvent is used, and environmental pollution is reduced; besides, the special immobilized penicillin G acylase and the penicillin V acylase are used for cracking the high-concentration penicillin GK or VK extracting solution, and special macroporous absorption resin is used for separating and cracking products, so that the processing steps are greatly simplified, the production cost is lowered, the product yield is increased, and the industrial production requirement is met.

The invention discloses a surface treatment method for weathering resistant steel. The method comprises the following steps that firstly, the weathering resistant steel is subjected to surface shot blasting treatment, and the surface roughness of the weathering resistant steel is between Ra 2.50 microns and Ra 3.50 microns; and secondly, the weathering resistant steel subjected to shot blasting treatment is subjected to high-temperature oxidation for 1 h-4 h at the temperature of between 250 DEG C and 350 DEG C, and then a dense rufous oxidation layer can be obtained. The appearance and color of the oxidation layer are similar to those of the weathering resistant steel used for a long time, and forming of a stable rust layer can be promoted. The method is simple in procedure, cost is low, environment friendliness is achieved, and it is avoided that a common surface stabilization coating applying method is utilized for rapidly stabilizing the weathering resistant steel, and consequently the environment is polluted.

A process for preparing the high-purity raw material of breviscapine beta includes such steps as dissolving breviscapine in water, adding pH regulator to make pH=4-8, adding solvent depositing filter, washing the deposit with solvent, adding the deposit to the solvent solution, adding acid to make pH=1-2, filter, water wash and drying.

The invention relates to a method for preparing hydrophilic polypropylene microporous film. The method includes subjecting low-melting-index polypropylene and diluents in a weight ratio of (20:80) to (80:20), a blending compatilizer containing polar groups and accounting for 0.5% to 20% of the total weight of the polypropylene and the diluents, and a material which is composed of nucleating agents and accounting for 0.05% to 10% of the total weight of the polypropylene and the diluents to solution blending or melt blending at a temperature ranging from 180 DEG C to 210 DEG C to obtain mixed materials; forming film by using a film scraping method or a hot-press method at a temperature of 170 DEG C to 190 DEG C; quenching the film in thermostatic waterbath at a temperature between 0 DEG C and 50 DEG C; extracting the film in an extracting agent to remove the diluents; dipping the film in a hydrochloric acid aqueous solution, and washing the film through distilled water and drying the film to obtain the hydrophilic polypropylene microporous film. According to the hydrophilic polypropylene microporous film prepared by the method, the average bore diameter range is between 0.1 micron and 10.0 microns, poriness is larger than or equal to 40%, and the water contact angle is smaller than or equal to 95 degrees.

The invention provides a novel powder metallurgy method for preparing nanometer or ultrafine microstructural titanium products. The method includes: step one, reducing grain size of titanium hydride powder to nanocrystalline level; step two, subjecting the titanium hydride powder in the nanocrystalline level to thermal consolidation to form pressed blanks; step three, under inert gas protection, heating the pressed blanks; step four, transferring the heated pressed blanks into an extruding device, and extruding under a certain pressure intensity and extrusion ratio to make the pressed blanks into the nanometer or ultrafine microstructural titanium products through an extruding mould with a certain inner cavity shape; step five, after extrusion is finished, cooling the extruded titanium products to the room temperature, and taking out; step six, heating the titanium products in a vacuum environment. A heating device used at the step three and the extruding device used at the step four are mounted in a same seal system, and insert gas is continuously fed into the seal system in a whole heating and extruding process.

The invention discloses a preparation method for a metal organic framework structure wrapped ammonium polyphosphate fire retardant and application. The preparation method comprises the following steps: dispersing ammonium polyphosphate in a methanol solution, adding the methanol solution containing dimethylimidazole in the mixed solution, uniformly stirring and mixing, dropwise adding the methanolsolution containing metal nitrate, uniformly stirring, performing a heating reflux reaction, centrifuging, washing and drying after completing the reaction, thereby obtaining the fire retardant. Thepreparation method has the advantages of simple processing step, high operability and low preparation cost; the active site of ammonium polyphosphate is sealed by adopting a metal organic framework structure to form an organic isolation layer with certain thickness to block the invasion of water, so that the polarity and the hydrophily of the material can be effectively reduced, the compatibilityand the dispersibility of the material and an organic high-molecular polymer are improved, and meanwhile, the catalytic charing effect is achieved, and the flame retardant efficiency of ammonium polyphosphate is improved; and the preparation method can be widely applied to fields of flame retardant materials such as epoxy resin, polyurethane, polystyrene, polylactic acid or polyolefin.

The invention discloses a preparation method for dendrobium candidum extract powder. The dendrobium candidum extract powder is prepared from dendrobium candidum by the steps: carrying out enzymolysis, alcohol extraction, concentration and drying. According to the preparation method disclosed by the invention, before alcohol extraction, enzymolysis is carried out on dendrobium candidum by a compound enzyme formed by cellulase, pectinase and papain, and the alcohol extraction method is assisted by the compound enzymolysis method, so that the purpose of improving the extraction efficiency and extraction rate is achieved. The preparation method is simple in process step, low in equipment requirement, strong in operability and suitable for industrial production.

The invention discloses a self-punching riveting die for a carbon fiber composite plate and an aluminum alloy plate. The self-punching riveting die comprises a rivet which is used for riveting the carbon fiber composite plate and the aluminum alloy plate, a punch which can reciprocate vertically in a through hole of a blank holder, and a female die body. Female die cavities in the center position of the female die body are concentrically formed with the punch. The side walls of the female die cavities are unthreaded hole cylindrical side walls, and cone bosses are arranged in the centers of the female die cavities. Unthreaded holes and the conical bosses are riveted and matched. The punch and the female die body are connected with a sensor, and height adjusting coefficients, speed adjusting coefficients and timing adjusting coefficients of the punch are obtained by collecting data. The invention further discloses a preparing method for the carbon fiber composite plate and a self-punching riveting method for the carbon fiber composite plate and the aluminum alloy plate. The self-punching riveting die and method for the carbon fiber composite plate and the aluminum alloy plate have the characteristics that large impact force can be borne, technology steps are simple, cost is low, and tensile, shearing resistance and fatigue resisting performance of a riveting connector are superior.