93results about How to "Meet the requirements of safe production" patented technology

The invention discloses a livestock and poultry anti-diarrheal feed additive and a preparation method thereof. In a technical scheme, the preparation method comprises the following steps of: smashing India quassiawood, dried ginger, licorice, costus root and the like; screening through a sieve; adding bean pulp, corn starch, bran and water to prepare a fermentation medium; adjusting the pH value,sterilizing, cooling, and inoculating for fermenting; and drying after the fermentation is finished to obtain the livestock and poultry anti-diarrheal feed additive. The livestock and poultry anti-diarrheal feed additive disclosed by the invention has the better functions of broad-spectrum bacterium resistance, virus resistance, parasite resistance, maintaining of the balance of microbial flora in the animal bodies, and can be used for effectively reducing the incidence of diarrheal of the livestock and poultry, promoting the growth of the livestock and poultry and reducing the cultivation investment; and the livestock and poultry anti-diarrheal feed additive has the characteristics of no toxic and side effects, no pollution, no residue, stable and reliable effect and the like, cannot give rise to drug tolerance, and can meet the requirement of people on safety production of the livestock and poultry products. The livestock and poultry anti-diarrheal feed additive disclosed by the invention also can be used as a veterinary drug in an increased dose manner, and has a remarkable curative effect for treating the diarrheal caused by various viruses, bacteria and parasitic infection for the livestock and poultry.

The invention relates to a heading machine memory cutting control system and a method of the heading machine memory cutting control system. The heading machine memory cutting control system is composed of a detection unit, a control unit, a proportion amplification plate, a load sensitivity type proportion reversal valve group and an execution unit, wherein the control unit comprises a PCC (programmable computer controller), an intelligent operation control panel, a remote controller and a machine body operating handle; and heading machine memory cutting comprises a manual demonstration process and a memory automatic cutting process. The method comprises the following steps that: firstly, a heading machine driver utilizes the remote controller or the machine body operating handle to operate the heading machine to cut once according to a top plate and a bottom plate of a coal seam and the coal rock distribution condition, and an airborne computer control system records information a demonstration path detected by the detection unit; and then the recorded keypoint data is subjected to path matching and intelligent optimization, a control signal is sent to the execution unit according to the path after optimizing, so that a cutting head is automatically controlled to move along a demonstration track, and the memory automatic cutting is performed. The heading machine memory cutting control system is also provided with a boundary control function in the whole memory cutting process, and the tunnel shaping quality when the manual cutting and memory automatic cutting are performed is ensured. The heading machine memory cutting control system and the method of the heading machine memory cutting control system provide a new control means for heading of a coal road boom-type roadheader under the condition with stable surrounding rock of roadway.

The invention discloses a method and a system for patrolling and maintaining a power distribution network automatic terminal. At least one power distribution network automatic terminal is connected with handheld equipment through wireless Bluetooth, wherein the handheld equipment comprises a detecting and maintaining module. The method comprises the following steps of: receiving a command for starting up the handheld equipment from a user; automatically establishing communication connection between the detecting and maintaining module and the power distribution network automatic terminal through the wireless Bluetooth; executing a communication command by using the detecting and maintaining module through the wireless Bluetooth; reading the ID (Identity) number of the power distribution automatic terminal by using the detecting and maintaining module; judging the uniqueness by using the power distribution network automatic terminal according to a Bluetooth matching code of the detecting and maintaining module to identify the permission of the user; and monitoring the running state of the power distribution network automatic terminal through the detecting and maintaining module, and estimating according to the running state. In the invention, the handheld equipment is in wireless Bluetooth communication with the power distribution network automatic terminal through the detecting and maintaining module, the Bluetooth matching code is adopted for protecting during communication, so that the non-power system patrolling personnel is prevented from accessing the handheld equipment and damaging the normal running of power equipment.

The invention discloses a traditional Chinese medicine fermented preparation for preventing and treating piglet diarrhea and a preparation method thereof. The traditional Chinese medicine fermented preparation for preventing and treating piglet diarrhea comprises the following components in parts by weight: 10 parts of andrographis paniculata, 8 parts of punica granatum peels, 8 parts of breynia fruticosa, 8 parts of portulaca oleracea, 6 parts of sophora flavescens, 10 parts of anemone chinensis, and 10 parts of coptidis rhizome. The preparation method of the traditional Chinese medicine fermented preparation for preventing and treating piglet diarrhea comprises the following steps of: pre-treating; preparing strain fermenting liquid; and fermenting the traditional Chinese medicine. The traditional Chinese medicine fermented preparation contains traditional Chinese medicine components capable of improving intestinal environment and metabolic products of multiple probiotics; and the traditional Chinese medicine fermented preparation obviously reduces the occurrence probability of piglet diarrhea, has no toxic or side effects, no pollution, no residual and no drug resistance, and can be widely used for feeding piglets.

The invention discloses a plant feed additive for preventing porcine diarrhea and a preparation method, belonging to the field of feed additives. One plant feed additive for preventing porcine diarrhea mainly comprises smashed folium cortex eucommiae, smashed lophatherum gracile, smashed poria cocos, smashed honeysuckles, smashed purslane, smashed dandelion, smashed liquorice, smashed orange peels and smashed red clovers. Another plant feed additive for preventing porcine diarrhea is mainly prepared by performing compound extraction on folium cortex eucommiae, lophatherum gracile, poria cocos, honeysuckles, purslane, dandelion, liquorice, orange peels and red clovers. According to the plant feed additive for preventing porcine diarrhea, the immunity of live pigs can be obviously improved, the diarrhea rate is lowered and the feed conversion rate is obviously increased even if a pig feed does not contain antibiotics and any hormone; quick growth of the live pigs is promoted, and requirements of people for safe production of poultry products are met.

The invention relates to a sylvite solid mine backfilling technology, in particular to a manufacturing method of a coagulation salt for sylvite solid mine backfilling. The manufacturing method of the coagulation salt for the sylvite solid mine backfilling comprises the following steps of: mixing and uniformly stirring magnesium oxide, a magnesium chloride saturated solution and sodium chloride salt particles contained in tailings according to the mass ratio of 1.00:(0.80-1.20):(5.00-15.00) to form a first slurry; also mixing and uniformly stirring the magnesium chloride saturated solution and the sodium chloride salt particles according to the mass ratio of 1.00:(8.00-15.00) to form a second slurry; finally pouring the first slurry and the second slurry, carrying out press forming, and then solidifying for 12-24 hours; and conserving under the condition that environmental temperature and humidity is less than 70 percent to prepare a coagulation salt block, wherein the coagulation salt block structurally comprises an outer layer (1) and an inner core (3). The invention has simple manufacturing process, low cost and good social benefit and economic benefit, solves the problems of pollution and stack caused by the tailings on the vegetation of a surrounding environment and realizes the requirements for clean production and environmental protection.

The invention relates to the technical field of robots, in particular to to an adsorbing base plate of a wall-climbing robot. The adsorbing base plate comprises a rack, a crawler belt and variable-magnetism adsorbing units, wherein the crawler belt is rotatably mounted on the rack; the at least two variable-magnetism adsorbing units are fixedly mounted on the outer wall of the crawler belt; poking rods are fixedly mounted at each of the front end and the rear end of the rack and matched with variable-magnetism grooved pulleys. According to the adsorbing base plate of the wall-climbing robot, provided by the invention, the structure is reasonable and compact, the use is convenient, and by cooperation of the poking rods and the variable-magnetism grooved pulleys, the direction of the magnetic force of the variable-magnetism adsorbing units can be changed, the variable-magnetism adsorbing units can be adsorbed onto or separated from the surface of a wind power tower barrel, the wall-climbing robot can walk on the surface of the wind power tower barrel through the adsorbing base plate; besides, the adsorbing base plate of the wall-climbing robot can carry cleaning and maintaining equipment to perform rust cleaning, cleaning and paint spraying on the wind power tower barrel, therefore the cleanliness and appearance of the surface of the wind power tower barrel can be maintained, the operational safety of a draught fan is improved, the labor intensity of workers is reduced, the construction period is shortened, the operating cost is reduced, and potential safety hazards are further reduced.

This invention relates to a making method of detecting carrier catalysis element coal firedamp, which is characterized by the following: rolling the platinum wire around the thin mill; dipping the dense hydrochloric acid to erase the corrosion of the mill; welding the clean platinum wire on the shelf of the element; brushing the platinum wire with carriers; heating the wire by electricity until white carriers appearing by heating. The black element is produced by brushing white element with catalysis then heated by electricity, which doesn't stop heating until the catalysis sintered. We can obtain a carrier catalysis element by matching the white and activation disposal black elements, which are disposed on the aging disposal platform in the sinter hood.

The invention relates to a coagulating salt for potassium salt solid mine backfilling and a manufacturing method thereof. The manufacturing method comprises the following steps: 1. preparing a magnesium chloride saturated solution; 2. evenly mixing 1.00 part by mass of magnesium oxide, 0.80-1.20 parts by mass of magnesium chloride saturated solution, 1.00-15.00 parts by mass of sodium chloride particle in tailings and 1.00-12.00 parts by mass of magnesium chloride particle in tailings to form a slurry; 3. casting the slurry, and curing to form; and 4. curing at ambient temperature under the humidity of lower than 70% for 6-12 hours to obtain the coagulating salt. By manufacturing the coagulating salt with a certain strength from magnesium oxide and a great deal of tailings containing sodium and magnesium salts, the invention has the advantages of simple manufacturing process, low cost and wide sources of magnesium oxide, can maximally backfill the tailings into the mine, meets the requirement of safety in production, and solves the problem of pollution of tailings for the vegetation in the ambient environment as well as the problem of stacking of the tailings, thereby having favorable social benefit and economic benefit.

The invention provides a preparation method of 2-chloro-6-trichloromethyl pyridine. The method comprises the following steps: carrying out water gasification by taking 2-trichlormethyl as initial material, then taking activated carbon with metal ion oxides, such as Fe, Zn and the like as catalyst, taking nitrogen as carrier gas, reacting with chlorine and then generating 2-chloro-6-trichloromethylpyridine, and rectifying to obtain the finished product with the overall yield being more than 75 percent. In the preparation method, continuous reactions are adopted, and the operation is very safeand convenient; and meanwhile, hydrogen chloride generated by reaction is prepared into hydrochloric acid by water absorption as the used materials are less, excess chlorine and sodium hydroxide reactto prepare sodium hypochlorite, therefore, the emission amount of three wastes is less, which is environmental-friendly; and the production cost of the product is greatly reduced.

The invention discloses an environment-friendly chemical nickel stripper and a deplating method thereof. Preferably, m-nitrobenzoic acid serves as an oxidizing agent for stripping a nickel-plated layer on an iron substrate; and since nitrate is generally stable in nature and low in toxicity, no waste gas or waste water is generated when the stripper provided by the invention is used, and the stripper does not corrode devices and has high affinity with the environment. Meanwhile, the stripper is further matched with diethyl dithiocarbamate and dodecyl sulfonate and combined with the deplating method thereof, the rate of stripping the nickel-plated layer on the iron substrate can be effectively increased, the nickel-plated layer can be stripped in a short time, and the production period is shortened. Compared with the prior art, the environment-friendly chemical nickel striper and the deplating method thereof have the advantages of being free of corrosion, poison gas and pollution, high in efficiency, environmentally friendly, easy and convenient to maintain and operate and the like.

The present invention relates to a production process of kitchen stainless steel chopper. Said production process includes the following several procedures: blanking, cleaning blank material, screen-printing, exposure, developing, etching, film-stripping, cleaning, film-coating, forming and finished product packaging. Besides, said invention also provides the concrete steps of above-mentioned every procedure.

The invention discloses an application of Trifolium repens in remediation of heavy metal contaminated soil, comprising planting Tifolium repens in the remediation of heavy metal contaminated soil; when Tifolium repens plants grow to the initial flowering stage, carrying out a first clipping on the above-ground portion of the plants; when the plants continue growing to the adult stage and the early bud stage, carrying out a second clipping on the above-ground portion of the plants; when the plants continue growing to the full flowering stage, removing the whole plants; wherein the heavy metal is one or more of copper, cadmium and lead. According to the invention, the Tifolium repens plants are planted in the heavy metal contaminated soil, the Tifolium repens can absorb and accumulate the heavy metal in the soil during the growing process, through harvesting the above-ground portion at fixed period and harvesting the underground portion at fixed period and repeating the planting a few times, the purpose of reducing the heavy metal content in the soil can be achieved, thus the remediation of the heavy metal contaminated soil is realized. The method has the advantages of simple operation and good remediation effect, and is easy to popularize.

The invention discloses an intelligent substation comprehensive monitoring system based on Beidou Internet of Things. The system comprises a monitoring main station and a monitoring station end, and the monitoring main station communicates with the monitoring station end through a Beidou communication system. The monitoring station end integrates transformer oil chromatography monitoring data, a transformer iron core grounding current, transformer infrared temperature measurement data, switch mechanical characteristic information, partial discharge information in a transformer and a switch cabinet, a temperature and humidity in the switch cabinet, a cable joint temperature, cable joint ultraviolet monitoring data, cable interlayer water immersion information, lightning arrester monitoringdata, a grounding point grounding resistance and the temperature and humidity of each power distribution chamber in a substation so as to realize all-weather full-coverage state monitoring on a main electrical equipment working condition, an electrical equipment surrounding environment and an electrical equipment safety protection condition of the substation. Linkage control is carried out on power equipment defects, abnormal information alarm and front-end alarm so that safety of power grid operation is improved, labor intensity of front-line personnel is reduced, and an enterprise operationbenefit is improved.

The invention discloses a microbial feed additive capable of enhancing immunity of fish and an application of the feed additive. The microbial feed additive includes, by weight, 16-22 parts of fructus forsythiae, 16-19 parts of herba andrographitis, 12-17 parts of artemisia apiacea, 15-21 parts of Chinese rhubarb, 1-2 parts of angelica sinensis, 13-20 parts of houttuynia cordata, 10-15 parts of radix glycyrrhizae, 7-11 parts of acanthopanax roots, 0.6-0.9 parts of garlic, 2-3 parts of pericarpium citri reticulatae, 3-5 parts of eucommia ulmoides, 0.8-1.3 parts of bacillus subtilis, and 1-1.4 parts of lactobacillus plantarum. The microbial feed additive is free of toxic and side effects, has no pollution and residual, is free of generating drug resistance, can promote secretion of antibodies by a host, improves activity of immune cells of the host and improves immunity and resistance of body. The microbial feed additive also maintains microecological balance in intestinal tracts and best immune state, and also improves digestion and absorption rate of nutrients.

The invention discloses a charging system for cupola furnaces. The charging system comprises a feeding device and two material guide devices, wherein the two material guide devices are respectively arranged at the front side of the corresponding cupola furnace and are divided into a left side material guide device and a right side material guide device according to different left and right positions of the two material guide devices, and the two material guide devices respectively comprise support structure elements and material guide structure elements and are basically symmetrical relative to a radial vertical surface positioned between the two material guide devices. Each material structure element comprises a material guide groove, an opening of the material guide groove faces the upper back part, the front end part of the material guide groove is fixedly connected onto a support frame, and in addition, the material guide groove is arranged in an inclined mode that the front part is higher and the back part is lower. Guide rails of the feeding device are horizontally arranged above the front and back middle parts of the two material guide devices in the left and right directions, so a hopper can discharge materials above any one of the two material guide devices, and the use of two cupola furnaces can be met.

The invention relates to an agricultural lifting device stall self-locking assembly utilizing an electromagnetic pole changing principle, and relates to the technical field of agriculture. The assembly comprises a mounting base, a main lifting wheel is movably connected to the top of the mounting base, a self-locking mechanism is movably connected to the front side of the main lifting wheel, and asecondary lifting wheel is arranged on the right side of the main lifting wheel. The agricultural lifting device stall self-locking assembly utilizing the electromagnetic pole changing principle doesnot influence normal use of equipment while a device normally works. When a hoisting device stalls and falls off, a rotating shaft of the lifting device is self-locked in time to prevent the hoistingdevice from continuing to descend, possible property and personnel losses are avoided, the safety of field constructors is guaranteed, the practicability and safety of the equipment are greatly guaranteed, requirements of China for safe production are better met, the production efficiency of agricultural product operators can be improved, and the income of the agricultural product operators can be further increased. Compared with the prior art, the reliability is higher.

The invention discloses a green separation technique for preparing magnolol and a honokiol monomer from a mangnolia officinalis raw material. The green separation technique comprises the following steps: performing ethanol backflow extraction on a mangnolia officinalis raw material so as to obtain an extract ointment; putting an alkali solution into the mangnolia officinalis extract ointment, leaving to stand to layer, removing an oil layer, and centrifuging so as to obtain precipitate and filtrate; drying the precipitate so as to obtain honokiol; adjusting the filtrate with an acid, leaving to stand, and centrifuging so as to obtain a water insoluble matter, that is, magnolol; dissolving the obtained honokiol with ethanol, recycling the ethanol till a great amount of blocky crystals are generated, and performing cooling crystallization, thereby obtaining high-purity honokiol. Compared with the prior art, the green separation technique is simple and convenient in method, good in energyconsumption, short in preparation cycle, low in cost, free of solvent residue, capable of meeting requirements of environment protection and security, applicable to industrial large-scale production,and extremely great in economic value and social benefit.

The invention discloses a cupola furnace body provided with a material guiding device, which comprises two parts: the cupola furnace body and the material guiding device. The cupola furnace body is a lateral charging type furnace body and comprises a furnace bottom part, a furnace cylinder part, a furnace body part and a chimney part sequentially from the bottom up. The charging opening of the furnace body is located at the lower part of the chimney part, and has a height of 400mm to 1500mm and a width equal to 80% to 100% the inner diameter of a hearth body of the furnace body. The material guiding device comprises a supporting structure piece and a material guiding structure piece, the material guiding structure piece comprises a material guiding groove opened upwards and rearwards and fixedly connected to the supporting structure piece, so that the material guiding groove is overall arranged in an inclined way higher at the front part and lower at the rear part. A sealing structure is formed between the material guiding groove of the material guiding device and the charging opening of the furnace body on the left side, the lower side, and the right side; and material in a hopper can be introduced into the furnace body through the material guiding groove from the outside.

The invention provides fermented soybean meal and a preparation method thereof. The preparation method comprises steps as follows: step S10, forage traditional Chinese medicine plants are pulverized, and forage traditional Chinese medicine plant powder is obtained; step S20, the forage traditional Chinese medicine plant powder, soybean meal, sugary substances and water are mixed in a preset mass ratio, and a soybean meal mixture is obtained; step S30, the soybean meal mixture is fermented, and the fermented soybean meal is obtained. The fermented soybean meal is digested and absorbed by animals more easily when taken as animal feed or an animal feed additive. The fermented soybean meal contains multiple forage traditional Chinese medicine plant ingredients capable of improving the intestinal environment and metabolites of multiple probiotics, the occurrence probability of piglet diarrhea can be reduced remarkably after a feeding object is fed with the fermented soybean meal, and besides, the fermented soybean meal has the advantages of no toxic or side effects, no pollution and no harmful substance residues, particularly, the feeding object does not generate drug resistance, and the fermented soybean meal meets the development tendency of antibiotic inhibition in feed.

The invention relates to a Chinese herbal medicine compound preparation for preventing piglet diarrhea and a preparation method. The Chinese herbal medicine compound preparation is characterized by being prepared from, by weight, 10-20 parts of Codonopsis pilosula, 8-16 parts of rhizoma atractylodis macrocephalae, 6-12 parts of the roots of kudzu vine, 6-12 parts of coptis chinensis, 1-10 parts of poria cocos and 1-10 parts of hawthorn fruits.

The invention discloses a test method for an ion implantation machine base. The test method is used for testing whether the ion implantation machine base is suitable for ion implantation for polycrystalline silicon or not so as to ensure stable thickness of an oxide layer growing on the surface of the polycrystalline silicon in a subsequent thermal oxidization process. The test method comprises the steps of providing a wafer; forming the oxide layer on the surface of the wafer so as to enable the wafer to be a tested wafer; putting the tested wafer into an ion implantation cavity of the ion implantation machine base; performing ion implantation for the tested wafer in the ion implantation cavity; and after performing ion implantation, measuring charges of the oxide layer, and judging whether the ion implantation machine base is suitable for ion implantation for polycrystalline silicon or not according to the charges. According to the test method, whether the ion implantation machine base is suitable for ion implantation for polycrystalline silicon or not can be accurately judged so as to ensure stable thickness of the oxide layer growing on the surface of the polycrystalline silicon in the subsequent thermal oxidization process.

The invention discloses a transformer substation security early warning linkage system which comprises a provincial main station system, a regional main station system and station end systems which are arranged in a layered mode; the provincial main station system, the regional main station system and the station end systems are in signal connection through a communication network, and the station end systems are each provided with a plurality of independent monitoring main systems; and each monitoring main system is connected with an environment monitoring subsystem used for monitoring a working environment, a video monitoring subsystem used for carrying out network video monitoring, an entrance guard control subsystem used for carrying out monitoring management on entrance guard, and a fire alarm subsystem used for fire early warning. According to the system, intelligent control is taken as a core, and all-weather state monitoring and intelligent control of main electrical equipment, key equipment installation sites and surrounding environment of the whole station are realized through integrated application of various Internet of Things technologies, so that the requirement of safety production of an electric power system is met, and meanwhile, the system can meet the requirement of safety guard of a transformer substation.

The invention belongs to the technical field of steel pipe galvanized machining, and specifically relates to a multi-station continuous machining production line after steel pipe hot-dip galvanizing.According to the main technical scheme, the multi-station continuous machining production line is mainly composed of an upward track connected with a zinc pot, a progressive conveying device connectedwith the upward track, a downward track arranged on the tail end of the upward track, and a water-chilling device connected with the downward track; the upward track is provided with a steel pipe outer surface blowing-and-wiping station, and a water-cooling continuous conveying station is arranged in the water-chilling device; the progressive conveying device comprises a rack, a material receiving station located at lateral support arms of the rack, a steel pipe inner surface blowing-and-wiping station, and an air cooling station; and progressive lifting support plates arranged close to two lateral support arms with synchronous movement, and the upper portions of the progressive lifting support plates are provided with multiple grooves for longitudinally lifting galvanized steel pipes forhorizontally conveying the galvanized steel pipes between adjacent stations in a progressive mode. The multi-station continuous machining production line has the advantages of reasonable structural design, compact and coherent machining links, being capable of processing hot-dip the galvanizing steel pipe in a dual-thread mode.

The invention discloses a rock stratum shield tunnel end reinforcing structure and a rock stratum shield tunnel end reinforcing method. According to the reinforcing structure, a row of grouting anchor rods are arranged at the front end of an enclosing structure; grouting is performed through the grouting anchor rods. The reinforcing method comprises the following steps: firstly, formulating a construction process flow; secondly, performing specific construction processes: firstly, performing drilling construction; secondly, performing construction of bamboo bar grouting anchor rods; thirdly, performing the construction of breaking a slot wall. The rock stratum shield tunnel end reinforcing structure and the rock stratum shield tunnel end reinforcing method have the beneficial effects that the rock stratum shield tunnel end reinforcing structure can be dug and removed; the whole sections of rod bodies are anchored; anchoring and grouting are combined. The strength is high; the weight is light; the safety is high; the advantages of preventing static electricity, resisting to low temperature and the like meet the requirements of safe production of underground engineering. The economical efficiency is that the construction cost can be greatly reduced.

The invention discloses an underground fixed liquid level testing device. The underground fixed liquid level testing device comprises an underground instrument and a ground control box, wherein the underground instrument mainly comprises a sounding device and a data acquiring device; the ground control box mainly comprises a ground computer terminal and a nitrogen bottle; the nitrogen bottle is connected to the sounding device of the underground instrument through a gas pipe for sounding in a well; the data acquiring device comprises a sound sensitive sensor, a pressure sensor and a core control circuit arranged in the well; the sound sensitive sensor and the pressure sensor are connected with the core control circuit; the core control circuit receives and stores data acquired by the sound sensitive sensor and the pressure sensor; and the core control circuit is connected with the ground computer terminal through an optical cable. The underground fixed liquid level testing device can realize continuous testing of a liquid level in an oil well, can satisfy the requirements of maritime safety production, and can solve the current situation of incapability of testing the liquid level due to the installation of a cable packer in a maritime electric pump well.

The invention discloses a semi-synthesis method for high-purity and high-stability gastrodin. The semi-synthesis method comprises the following steps: carrying out a reduction reaction by taking tetraacethyl as a raw material; concentrating and adding a suitable amount of water into concentrated liquid; filtering and drying to obtain acethyl gastrodin; recycling a filtering solution which is used as a mother solution a; adding an alcohol solvent into the acethyl gastrodin to carry out a reflowing reaction, and concentrating; repeatedly reflowing and concentrating to obtain a concentrated solution; adding a non-polar solvent and filtering; drying solids to obtain a gastrodin rough product; recycling a filtering solution which is used as a mother solution b; adding alcohol and / or an ester solvent into the rough product of gastrodin; heating and completely dissolving; filtering and separating out crystals to obtain a refined product of gastrodin; recycling a filtering solution which is used as a mother solution c; mixing the mother solution b and the mother solution c; filtering and drying to obtain the rough product of gastrodin; and refining to obtain the refined product of gastrodin. The acethyl gastrodin prepared by the semi-synthesis method disclosed by the invention is stable, can be directly used as a crude drug, and can also be used as an intermediate to synthesize the high-purity gastrodin; the semi-synthesis method for the high-purity and high-stability gastrodin is very good for meeting the clinical demands on gastrodin and acethyl gastrodin.

The invention discloses a high-low pressure cavity cable connection seal box for low-temperature immersed centrifugal turbine generator power transmission. The high-low pressure cavity cable connection seal box is characterized in that the high-low pressure cavity cable connection seal box comprises a junction box and a conductor rod, the conductor rod is arranged in the junction box, conical surface sealing is adopted between the conductor rod and the junction box, one end of the conductor rod is used for being connected with a wire of a motor arranged in a low-temperature immersed centrifugal turbine, and the other end of the conductor rod is used for being connected with a low-temperature power cable in the low-temperature immersed centrifugal turbine. According to the cable connection seal box, the power supplying of the generator can be ensured, and when the electronic transmission is conducted, due to the fact that the conical surface sealing is adopted between the conductor rod in the seal box and the junction box in the seal box, the sealing performance is good, the phenomenon that the performance of a unit is degraded due to the fact that media in a high-pressure cavity leaks into a low-pressure cavity can be avoided, and the efficiency of the whole machine is improved.

The invention relates to a method for protecting underground powerhouse gate shaft against water seepage. The method comprises the steps that firstly, a water collecting well is arranged at the position of a dewatering pump on the downstream side; secondly, leakage treatment is conducted on the wall of the gate shaft and the bottom of the gate shaft, leakage points and leakage seams are found, drainage channels are dug, drainage pipes are embedded, and water is guided to peripheral drainage ditches; thirdly, overall finishing treatment is conducted on the wall of the gate shaft, and the wall of the gate shaft is coated with waterproof paint; fourthly, steel bars are implanted in the bottom of the gate shaft through drilling, holes are sealed through grouting, the steel bars are fixedly connected to a base plate and bound together to form a bar-mat reinforcement, roughening is conducted at the bottom of the gate shaft, and concreting is conducted with the second quadrant of a gate door as the start point and the water collecting well as the fourth quadrant according to the slope ratio of 1:200; drainage ditches are reserved on the periphery of a wall according to the inclination of 1:100, and the bottom of the gate shaft is coated with waterproof epoxy paint. By the adoption of the method, the gate shaft is protected against water seepage, the site is clean, tidy and attractive, operation is convenient, and the requirement for safety production of the gate shaft is met.