57results about How to "Avoid oxidation and blackening" patented technology

The invention relates to a stainless steel ion nitriding process, and in particular relates to an austenitic stainless steel ion nitriding permeation catalyzing process. The process mainly comprises the following steps: 1) washing the surface of a stainless steel surface, and removing the oil stain and impurities on the surface of the workpiece; 2) carrying out pre-oxidation treatment on the stainless steel workpiece; 3) putting the stainless steel workpiece into an ion nitriding furnace after being cooled down, introducing dried hydrogen, building up of luminance and heating up, after reaching a certain temperature, introducing nitrogen, adjusting the ratio of the nitrogen to the hydrogen and the pressure in the furnace, subsequently starting to time, after nitriding for a certain time, closing the ion nitriding furnace and cooling down the workpiece along with the furnace. The austenitic stainless steel treated by using the process can obtain a compound layer which is thicker than that of an ordinary ion nitriding process.

The invention relates to a multi-point laser welding clamping device for a battery pack busbar. The device comprises a bottom plate, an upper clamping plate and a lower clamping plate, wherein a vertical cylinder and a supporting plate are arranged at each of the left side and the right side of the bottom plate; each supporting plate is positioned at the inner side of the corresponding vertical cylinder; the left side and the right side of the lower clamping plate are respectively mounted on the two supporting plates, while the left side and the right side of the upper clamping plate are respectively mounted on the two vertical cylinders; the upper clamping plate is a laser welding type upper clamping plate capable of charging nitrogen; the lower clamping plate is a tray of which the left side, the right side and the rear side are provided with upward enclosing edges; a gap is formed in the front side edge of the tray; a horizontal cylinder to which a vertical baffle plate is connected is arranged at each of the lower left side and the lower right side of the tray, wherein the baffle plate is higher than the tray. The device is reliable to clamp and convenient to control; all welding parts on the busbar can be welded with laser, thus achieving multi-point welding; meanwhile, the nitrogen can be charged to the welding parts, so that welding points can be effectively prevented from oxidative blackening, and as a result, the welding firmness can be ensured, and the working efficiency can be improved.

The invention discloses a full-automatic assembling machine for a high-voltage large-current connector terminal and a process method of the full-automatic assembling machine. The assembling machine comprises a rack table, a station indexing device, a reed feeding device, a torsion spring device, an aligning device, a terminal assembling device, a terminal detection device and a vibration feeding device. A plurality of clamps which correspond to the reed feeding device, the torsion spring device, the aligning device and the terminal assembling device one by one are uniformly arranged on the outer circumference of the station indexing device. Stations corresponding to the clamps can carry out parallel simultaneous processing. The torsion spring device can accurately control the torsion angleto adjust the torsion spring deformation amount. The terminal detection device can automatically detect the terminal plugging force and screen unqualified products. Statistical analysis is carried out on the plugging force detection result, and an adjustment basis is given out for the torsion spring angle. The full-automatic assembling machine can achieve automatic feeding, automatic material transferring, automatic torsion spring, automatic assembly and automatic plugging force detection, screening and discharging, full-automatic assembly production of connector terminals is realized, and production efficiency is remarkably improved.

The invention belongs to the field of food processing and particularly relates to a potato slicing device. The potato slicing device comprises a box body; a slicing mechanism is arranged at the upperend of the box body; a double-shaft motor is installed at the upper end of the box body and is in transmission connection with the slicing mechanism through a first transmission mechanism; a feeding port is formed in the upper end of the box body; a discharge port is formed in the side wall of the box body; a side door is hinged to the interior of the discharge port; a conveying mechanism is arranged in the box body; the double-shaft motor is in transmission connection with the conveying mechanism through a second transmission mechanism; a partition plate vertically arranged is arranged belowthe conveying mechanism; the lower end of the partition plate is fixedly connected with the inner bottom surface of the box body; one side of the partition plate is fixedly connected with a filteringplate; and one end, far away from the partition plate, of the filtering plate is fixedly connected with the inner side wall of the box body. The potato slicing device has the advantages that when potato chips are subjected to slicing treatment, the potato chips are unlikely to be attached to the surfaces of blades or the surface of the conveying mechanism, so that deterioration of the potato chipsis reduced, and the potato chips are subjected to soaking treatment by water, so that oxidation of the potato chips is reduced.

The invention relates to a system for preparing viscose by pretreating corn straw through microbial co-culture. Corn straw peel obtained after corn straw stalks and leaves and peel are separated is used as a raw material, microbial co-culture of biomass degradation rumen microorganisms and a rumen microorganism degradation product or metabolite is achieved through fermentation of special equipment to degrade hemicellulose and unstable cellulose in the straw peel, the fermentation product can be separated in situ through regulation to achieve biological pretreatment on the corn straw peel, remaining high-crystallized lignocellulose is continuously cooked under the anaerobic environment to remove lignin and is subjected to cellulose dyeing or bleaching, viscose dissolution spinning is directly carried out on centrifuged cellulose pulp under the condition of certain water content, or melt spinning is carried out under the dry condition to prepare viscose. Usage of agentia for following cooking delignification is reduced through biological pretreatment, and then pollution is reduced; oxidization and blackening of pulp are reduced through anaerobic cooking, and then pollution is reduced; meanwhile, characteristics of fiber are kept to the maximum.

The invention discloses an air conditioner liquid storage device welding protection device and an application method thereof, and belongs to the technical field of welding. The air conditioner liquid storage device welding protection device comprises an outer ventilation block and an inner ventilation block. The outer ventilation block is of a rectangular block-shaped structure and is provided with a transverse air blowing hole and longitudinal air blowing holes and connected with an air source through an outer ventilation connecting hole. An inner air blowing hole is formed in the inner ventilation block and connected with the air source through an inner ventilation connecting hole. According to the method, a cylinder is inflated with protection air through the inner ventilation block in the welding process, the welding position is immediately inflated with the protection air through the outer ventilation block after welding is finished, and air is prevented from making contact with a welding line. By means of the air conditioner liquid storage device welding protection device and the application method thereof, the surface of a welded part can be prevented from being oxidized during liquid storage device welding, the connecting strength of the welding line is improved, the quality of a finished product is improved, and the production cost is reduced.

The invention provides an anti-oxidation adjustable Chinese yam slicing device, and relates to the technical field of Chinese yam processing. The anti-oxidation adjustable Chinese yam slicing device comprises a support, a water tank, a slicing mechanism, telescopic boxes and a collecting mechanism, wherein the water tank is arranged below the support, and the slicing mechanism is arranged above the water tank. Chinese yams are sliced through a peel cutting mechanism, the distance between cutting blades can be adjusted, and therefore the Chinese yam slicing requirements of different thicknessesare met. The top end of the slicing mechanism is fixedly connected with the bottom end of the support. The telescopic boxes are arranged on the left side and the right side, close to the top end, ofthe water tank and fixedly connected with the two sides of the water tank. The collecting mechanism is arranged in the water tank and used for collecting sliced Chinese yams to prevent the Chinese yams from being oxidized and blackened due to long-time contact with air. The bottom end of the collecting mechanism is fixedly connected with the bottom end of the water tank. The problems that the distance between blades of an existing yam slicing device cannot be changed to meet different slicing requirements, and yams are oxidized and blackened after being sliced are solved.

The invention provides a manufacturing method of an instant sweet potato food, and belongs to the technical field of food processing. The method comprises the following steps: cooking sweet potatoes until the sweet potatoes are 70% to 80% cooked; cutting the cooked sweet potatoes into strips, cooking the sweet potato strips until the sweet potato strips are fully cooked; spraying amylase over the sweet potatoes strips, placing the sweet potato strips in a temperature-constant oven for 2 to 3 hours; drying the sweet potato strips by steam, and finally wetting so as to obtain dried sweet potato strips. Compared to the prior art, when the cooked sweet potatoes are cut, no sweet potato crumb is generated during the cutting process, at the same time, the surface of sweet potato strips is processed by amylase, thus a layer of saccharide compounds is formed on the surface of the sweet potato strips, and the taste becomes better.

The invention discloses a natural plant electroplating and finishing technique and mainly solves the problems that the natural plant is soft in texture, easy to break, rot and go bad and the problems of an earlier stage processing method of the natural plant, a method for transforming a non-conductor to a conductor, selection and combination of electroplating liquid formulation. When drying the plant, an alkali liquor is used for cooking the plant, then mesophyll is lightly brushed away, and leaf vein is retained; when transforming the non-conductor, a method for mixing carbon nanotube powder with two-component polyester resin is used for coating a conductive layer; finally, noble metals or ionic liquid aluminum is plated by using a cyanide-free electroplating formulation. Through the technique, the natural plant, which is difficult to store, can be processed by a series of methods for drying, removing mesophyll, coating protection layers and electroplating, so that the natural form of the natural plant can be stored for a long time; the natural plant does not go bad and rot; meanwhile, the appreciation and collection value is greatly improved, thus giving the enjoyment of beauty to people.

The invention discloses an electro-deposition copper foil post-treatment device. The device comprises a mounting table, an electrolytic tank is fixedly arranged on the mounting table, an anode plate is arranged at the bottom of the electrolytic tank, a cathode roller is coupled in the electrolytic tank, a mounting frame is fixedly connected to the mounting table above the cathode roller, a copper foil cleaning mechanism is arranged on the mounting frame, a drying mechanism is arranged on one side of the copper foil cleaning mechanism, and a winding mechanism is arranged on one side of the drying mechanism. According to the electro-deposition copper foil post-treatment device, a copper sulfate solution attached to the surface of the copper foil flows into an anode tank again through a liquid squeezing roller, and recycling of the copper sulfate solution is achieved; and the upper and lower surfaces of the copper foil are cleaned through a plurality of groups of brush water spraying rollers and vacuum adsorption rollers, and are dried through a drying box body, so that the copper sulfate solution attached to the surfaces of the copper foil is thoroughly removed.

The invention discloses an efficient and environment-friendly film-stripping solution capable of keeping a copper surface bright. The film-stripping solution comprises sodium hydroxide and / or potassium hydroxide; the film-stripping solution is characterized by comprising the following components in percentage by weight: 1-25% of sodium hydroxide and / or potassium hydroxide, 0.01-12% of a component which is selected from one or more of hydrazine hydrate, hydroxylamine hydrochloride, hydroxylamine sulphate, sodium sulfite, sodium thiosulfate or potassium iodide, and the balance of water; and the film-stripping solution also can be prepared into a film-stripping condensated solution, including the following components in percentage by weight: 25-40% of sodium hydroxide and / or potassium hydroxide, 0.02-20% of a component which is selected from one or more of hydrazine hydrate, hydroxylamine hydrochloride, hydroxylamine sulphate, sodium sulfite, sodium thiosulfate or potassium iodide, and the balance of water. The film-stripping solution is high in film-stripping speed and capable of preventing from blackening the copper surface in the film-stripping process, without etching the copper surface; and in addition, the film-stripping solution can reach the standard for emission without causing pollution to the natural water body.

The invention relates to a rubber sheath material for a cable. The formula of the rubber sheath material comprises the following components in parts by weight: 100 parts of chlorinated polyethylene, 20-80 parts of bentonite, 20-40 parts of plasticizing agent, 2.5-5 parts of vulcanizing agent, 1.5-6 parts of vulcanizing additive, 1.0-10 parts of activating agent, 0.2-3 parts of anti-aging agent and 0.5-1.5 parts of coupling agent. The rubber sheath material has the advantages that the formula is low in cost and simple in component; all the components have respectively-independent actions and advantages, and are also matched mutually to form a complete body; in the milling and weighing process with more steps, the production efficiency can not be reduced, once the batching generates problems, the inspection is very convenient; sulfur is not added in the material, so that the problem that oxidation and blackening of copper caused by mobility of sulfur are caused to accelerate the ageing of an insulating layer and cause the problem of larger potential hazards of the cable in use is avoided, so that the safety coefficient is improved; and a product prepared by the formula is excellent in performance.

The invention discloses a persimmon peeling device and particularly relates to the field of persimmon processing equipment. The persimmon peeling device comprises a conveying mechanism, a placing mechanism, a fixing mechanism, a peeling mechanism and a sprinkling mechanism and is characterized in that the placing mechanism is obliquely arranged on one side of the top of the conveying mechanism, the fixing mechanism is arranged at the top of the conveying mechanism, the peeling mechanism is arranged above the fixing mechanism, and the sprinkling mechanism is arranged on one side of the peelingmechanism; the conveying mechanism comprises rotary shafts, gears, chains, conveying plates and a drive motor. The persimmon peeling device has the advantages that the conveying mechanism is in linkage with the fixing mechanism through a linkage mechanism, and stepping conveying of the conveying plates and clamping of the fixing mechanism can be achieved by the coordination of a U-shaped frame anda motor self-reset switch; by the coordination of an upper pressing plate and a self-reset switch, when a pull rod drives a cutting head to move downwards, persimmon rotary cutting and sprinkling oxidation prevention of peeled persimmons can be achieved at the same time, high persimmon processing efficiency is achieved, and the whole device is convenient and safe to operate.

The invention relates to glutinous rice wine and a production method thereof and sweet osmanthus sake produced by the glutinous rice wine and a production method of the sweet osmanthus sake and belongs to the field of wine brewing. The production method of the glutinous rice wine includes: processing glutinous rice to obtain cooked glutinous rice, mixing the cooked glutinous rice with sweet distiller's yeast, fermenting to obtain fermented wine liquid, and performing second fermentation; adding water with the weight being 0.2-0.4 time of the weight of the glutinous rice when the baume degree of the fermented wine liquid is 28-35, evenly stirring, and continuing fermenting for more than 12 hours; adding water with the weight being 0.3-0.5 time of the weight of the glutinous rice when the baume degree of the fermented wine liquid is 22-27, evenly stirring, and fermenting at 12-20 DEG C for more than 24 hours; separating the fermented wine liquid when the baume degree of the fermented wine liquid is 13-18. By the method, the fermentation process can be controlled effectively, and the glutinous wine stable in taste and flavor can be obtained.

The invention provides a white tea with a health-maintaining function and a processing technique thereof and belongs to the technical field of tea processing. The white tea is prepared from the following raw materials in parts by weight: 50-70 parts of fresh tea, 2-5 parts of eucommia ulmoides, 3-6 parts of semen cassia, 3-6 parts of orchid, 3-10 parts of roses, 5-10 parts of roxburgh roses, 1-3 parts of fresh lemon and 1-3 parts of scabish. According to the formula of the white tea with the health-maintaining function, fresh tea, eucommia ulmoides, semen cassia, orchid, roses, roxburgh roses, fresh lemon and scabish are prepared into the white tea with the health-maintaining function; the white tea is rich in vitamin B, carotene, organic acid, more than 20 amino acids and more than 10 kinds of microelements beneficial to human bodies; the white tea has the healthcare functions of resisting oxidation, whitening skin, resisting radiation, resisting aging, invigorating the stomach and promoting digestion, activating blood and removing freckles as well as clearing heat and improving eyesight; and the healthcare effect is promoted.

The invention discloses an anti-oxidation brocade cannetille structure. The cannetille comprises core wires; a gold-silver foil layer rotatably coats the surfaces of the core wires along the length directions of the core wires, is fixed to a film base layer, and is positioned between the film base layer and the core wires. According to the structure disclosed by the invention, the gold-silver foil layer is fixed to the film base layer and is positioned between the film base layer and the core wires, so that the gold-silver foil layer is isolated from external air to prevent oxidative blackening caused by the contact between the gold-silver foil and substances in the air, and the using effect of the cannetille is guaranteed.

The invention designs a laser coaxial soft soldering device for a dense pin connector. The laser coaxial soft soldering device comprises a light path mechanism, a CCD imaging mechanism, a wire feeding mechanism and a welding wire distributing mechanism. The light path mechanism generates annular laser at the pin welding position, the CCD imaging mechanism is used for visually judging the actual position of a pin and guiding real-time position calibration, the wire feeding mechanism is used for feeding a welding wire in the protective gas atmosphere, and the welding wire distribution mechanism comprises a distributor, a stepped shaft, a straight movement shaft, a straight movement shaft guider, a supporting sleeve, a straight movement shaft and a stepped shaft driving motor. The distributor comprises a coaxial cylinder assembly which has a set number of turns and is sleeved together, and the welding wire distribution mechanism is used for fixing a connector, clamping a wire, bending wire heads in sequence, aligning the wire heads with pins and then positioning the wire heads, and then carrying out laser welding on the pins in sequence. The welding wire distributor sequentially feeds the wire heads clamped by the jig into a brazing area for welding; the device is simple in structure, the problem of obstacles in paraxial wire feeding welding is solved, laser alignment is accurate, and the welding yield and the working efficiency are improved.

The invention relates to a disinfectant, specifically to a hydrogen peroxide disinfectant and a preparation method thereof. The disinfectant is prepared from the following raw materials in parts by weight: 10-30 parts of 30% hydrogen peroxide, 5-18 parts of sodium phosphate, 2-6 parts of 1-hydroxyethylidene-1,1-diphosphonicacid, 3-7 parts of polyvinyl alcohol, 3-8 parts of caustic soda, 2-5 parts of nano silver, 1-4 parts of cresylic acid, 1-4 parts of sodium dodecyl benzene sulfonate, 2-6 parts of potassium tungstate, and 4-7 parts of titanium dioxide powder. The technical scheme provided by the invention can make up the defects of limited anti-corrosion capability of a disinfectant provided in the prior art and unconspicuous cooperation among various raw materials to a certain degree.

The invention provides a processing technology of white tea, belonging to the technical field of tea processing. The processing technology comprises the following steps: picking tea, washing, air-drying, withering, top-speed cooling, low-temperature fermentation, hot-air drying, aroma increasing and bagging, wherein the top-speed cooling refers to that the green-killed tea is cooled to -10-0 DEG C within 50s, and the temperature ranging from -10-0 DEG C is kept for 2-4h. The withered tea belonging to slightly-fermented white tea is especially cooled to -10-0 DEG C at top speed, so that water in the tea is fast condensed; the tissues of chlorophyll can be changed in low-temperature fermentation, so that the large majority of chlorophyll is transformed during low-temperature fermentation and the finished product is whiter; the tea is kept at the temperature ranging from -10-0 DEG C for 2-4h, so that the most of tissues in tea leaves can be damaged, beneficial substances of tea polyphenols and the like are released, and volatile aroma substances in the tea leaves can be condensed to lead the aroma to be heavier during soaking.

The invention relates to an irradiation crosslinked polyolefin elastic insulation and sheath rubber soft cable. The irradiation crosslinked polyolefin elastic insulation and sheath rubber soft cable comprises an outer sheath and a plurality of conductor cable cores, each conductor cable core is composed of a conductor and an insulating layer wrapping the outer surface of the conductor, the conductor cable cores are jointly wrapped by the outer sheath, and the outer sheath is an irradiation crosslinked polyolefin elastic outer sheath. The irradiation crosslinked polyolefin elastic insulation and sheath rubber soft cable is reasonable in design, ingenious in improvement and high in practicality, is manufactured through clean energy irradiation accelerator in a mode of irradiation of crosslinked clean energy and meets the national standards. The irradiation crosslinked polyolefin elastic insulation and sheath rubber soft cable is good in quality, long in service life, low in energy consumption in the machining process and free of pollution.

The invention discloses a thick gold electroplated copper based workpiece and a manufacturing method. The manufacturing method comprises the steps of pretreatment, bottom nickel layer electroplating,18K gold layer electroplating, 23K gold layer electroplating, stress removal, tinting, and antitarnish coating treatment. A surface shell of the thick gold electroplated copper based workpiece sequentially comprises a bottom nickel layer, a 18K gold plated layer, a 23K gold plated layer and an antitarnish coating from inside to outside. The manufacturing method comprises the steps that before thick gold electroplating, bottom nickel electroplating treatment is carried out, after thick gold electroplating, annealing treatment is carried out, antitarnish coating treatment is carried out on the surface of a thick gold plating, prepared electroplated thick gold is bonded with a copper base firmly, peeling is not easy, the service life of a gold cladding is prolonged, the cladding is uniform and compact, and attractive in color, and a good oxidation color changing prevention property is achieved.

The invention relates to a contact wire cleaning and oiling device and a working method thereof, and belongs to the field of wire production. The device comprises a base (1), and a baffle (11) and a supporting frame (2) are arranged on the base (1); a shaft rod (3) is arranged on the supporting frame (2), and the shaft rod (3) sequentially passes through shaft holes of a cleaning clamp (4), an airinjection clamp (5) and an oiling clamp (6) and connects and installs the cleaning clamp, the air injection clamp and the oiling clamp; limiting pins (31) are arranged at the two ends of the shaft rod (3); a contact line (7) sequentially passes through the cleaning clamp (4), the air injection clamp (5) and the oiling clamp (6) in the moving direction. The device provided by the invention is compact in structure, small in size, convenient to replace parts, convenient to install and suitable for continuous production of metal wires, and through cooperation of the cleaning clamp, the air injection clamp and the oiling clamp, the surface of a contact line can be effectively cleaned, and the contact line can be prevented from being oxidized and blackened.

The invention provides an anti-oxidation copper wire annealing furnace and an annealing method. The anti-oxidation copper wire annealing furnace comprises a furnace body, a spraying mechanism, a liquid storage box, an air cylinder, air compressors, a filter and a wire passing sensor, a plurality of annealing pipes are arranged in the furnace body, and the spraying mechanism, the filter, the liquidstorage box, the air cylinder and the air compressors are connected in sequence. The spraying mechanism comprises a main pipe, solenoid valves, branch pipes and spraying pipes, the filter and the solenoid valves are connected through the main pipe, the branch pipes are connected with the spraying pipes, an ethanol aqueous solution is stored in the liquid storage tank, and the air compressors, thesolenoid valves and the wire passing sensor are all connected with a controller. According to the anti-oxidation copper wire annealing furnace and the annealing method, the ethanol aqueous solution is sprayed to the annealing pipes through compressed air and forms steam through the high temperature of the annealing pipes, oxygen is prevented from entering the annealing pipes, and oxidized parts are reduced through the reducibility of ethanol, so that oxidation blackening is effectively prevented, and the product quality is improved; and the solenoid valves are controlled through the controller, automatic spraying is carried out, precise control is achieved, waste of the ethanol aqueous solution and compressed air is avoided, and the production loss is further reduced.

The invention belongs to the technical field of electromagnetic wires and discloses a special electromagnetic wire and a preparation method thereof. The special electromagnetic wire is prepared through the steps of paying off, oil immersion, preheating, high-temperature extrusion, cooling, take-up and the like. According to the preparation method of the special electromagnetic wire provided by theinvention, the adhesive force between an insulating layer and a wire is improved, the preparation process is environment-friendly, the operation is simple, and the prepared special electromagnetic wire is thin in the insulating layer, uniform in thickness and smooth in surface, and has the characteristics of excellent wear resistance, good toughness, high voltage resistance value, long corona resistance time, hydrolysis resistance and radiation resistance. The preparation method of the special electromagnetic wire is suitable for producing the special electromagnetic wire, and the prepared special electromagnetic wire is suitable for motor equipment.

The invention discloses a preparation method of anti-oxidative brocade gold and silver threads. The preparation method comprises the following steps that a gold and silver foil layer is fixed on one side end face of a film substrate through magnetron sputtering; multiple core threads are coiled into strands; the film substrate fixed with the gold and silver foil layer is wound and fixed to the surfaces of the core threads to form the gold and silver threads, and the gold and silver foil layer is made to be located between the core threads and the film substrate; the gold and silver threads penetrate through paint liquid and penetrate through a die through hole; the gold and silver threads penetrating through the die through hole are dried; the last two steps are repeatedly performed until the surface of a paint layer is flat. According to the preparation method, due to the fact that the gold and silver foil layer is fixed to the film substrate and located between the film substrate and the core threads, the gold and silver foil layer is isolated from the outside air, the phenomenon that the gold and silver foil makes contact with substances in the air to be oxidized and blackened is prevented, and the using effect of the gold and silver threads is guaranteed.

The invention relates to a chain cleaning oiling device, and belongs to auxiliary equipment of chain production and machining. The technical scheme of the invention is that: the chain cleaning oiling device includes a cleaning device and an oiling device. The cleaning device includes a cleaning box for holding cleaning liquid and a plurality of cleaning rollers with different heights which are arranged in the cleaning box. The oiling device includes an oil storage box for holding chain oil and a plurality of oiling rollers with different heights which are arranged in the oil storage box, wherein a pressing roller is arranged above the last oiling roller arranged in the oil storage box, and the pressing roller is connected to an air cylinder. The advantages of the invention are that the chain cleaning oiling device can clean and oil a chain, can save labors, and can improve the working efficiency; and the chain cleaning oiling device can evenly and completely clean and oil the chain, can filter and recover redundant oil on the surface of the chain, and can form a thin oil layer on the surface of the chain so as to prevent the chain from being oxidized and black and prevent oil waste.

The invention discloses an environment-friendly and efficient levodopa production method. According to the production method, cat bean hulls are preprocessed, wax and oil on the hulls are removed, a solution circulation and substance exchange channel is formed, the cat beans are not crushed, thus the leaching of starch and protein in cat bean meat is greatly reduced, the generated process wastewater is reduced, energy is saved, and the environment is protected. Meanwhile, the leach liquor contains ethanol, so that the solubility of starch and protein in water can be reduced, and oxidation andblackening of levodopa can be effectively prevented by adding vitamin C. The yield of the levodopa product produced by the method is 3.0-3.5%, and the detected levodopa content is 99-101% and is higher than that of a levodopa product produced by an existing production process.

The invention discloses a copper-based workpiece electroplated with thick silver and a manufacturing method of the copper-based workpiece. The manufacturing method comprises the steps of pretreatment, electroplating of a bottom gold layer, electroplating of an acid light copper layer, electroplating of a palladium cobalt layer, electroplating of a gold layer, electroplating of a silver layer, stress relief and treatment of an anti-discoloration coating. The surface of the copper-based workpiece electroplated with the thick silver comprises the bottom gold layer, the acid light copper layer, the palladium cobalt layer, the gold layer, the silver layer and the anti-discoloration coating in sequence from inside to outside. According to the manufacturing method, the bottom gold electroplating treatment is carried out before thick silver electroplating is conducted, the annealing treatment is carried out after thick silver electroplating is accomplished, the anti-discoloration coating treatment is carried out on the surface of the thick silver plating layer, and therefore the prepared electroplated thick silver is firmly combined with a copper base and is not prone to peeling, the service life of the silver plating layer is prolonged, the plating layer is uniform and compact, the color is silvery white, and the good oxidation discoloration resistance is achieved.

The invention discloses veterinary long-acting oxytetracycline injection liquid and a preparation method thereof. The veterinary long-acting oxytetracycline injection liquid contains oxytetracycline dihydrate, magnesium oxide, sodium formaldehyde sulfoxylate, glycerol formal, polyvinylpyrrolidone K12, polyethylene glycol-400, monoethanolamine and water for injection. According to the veterinary long-acting oxytetracycline injection liquid, the combined action of the oxytetracycline dihydrate with the low impurity content and the high purity, the sodium formaldehyde sulfoxylate, the magnesium oxide and the glycerol formal improves stability of the injection liquid, and the storage time of the injection liquid is prolonged; after the polyethylene glycol-400 is adopted to conduct intramuscular injection, the blood concentration peak can be reached in short time, so that intramuscular injection is easier; and by adopting the polyvinylpyrrolidone K12, drugs are slowly released, the drug action time is prolonged, the injection interval time is prolonged, the injection dosage is decreased, and animal stress response is reduced.