1996results about How to "Guaranteed purity" patented technology

The invention discloses argon recovery equipment capable of achieving stable rectification and a working method thereof.The argon recovery equipment capable of achieving stable rectification comprises a rectification system, the rectification system comprises a temperature adjusting mechanism and an argon extraction unit, and the argon extraction unit comprises a pure argon tower, an argon tower reboiler, a pure argon pipe set, a first valve set and a stability increasing component; the stability augmentation component comprises a stability augmentation assembly and a temperature detection piece, and the stability augmentation assembly comprises a nitrogen compressor and a nitrogen reboiler. According to the amount of pure argon gasified through heat exchange between pure liquid argon obtained through rectification in the pure argon tower and dried crude argon obtained after cooling in the argon tower reboiler, the supply amount of dry nitrogen is adaptively adjusted through the stability augmentation component so as to adjust the amount of pure argon supplied to the pure argon tower by the nitrogen reboiler; the argon extraction unit and the argon tower reboiler are jointly matched with the actual working condition of the argon tower reboiler, so that the anti-interference capability of the argon extraction unit is improved, the stability of the rectification process is ensured, and the purity of the obtained pure argon is ensured.

The invention discloses an improved efficient turbulent flow microbubble flotation device for feeding and discharging materials. Comprising an outer cylinder, an inner cylinder arranged in the outer cylinder, a stirring mechanism arranged in the outer cylinder, a feeding mechanism used for conveying raw materials into the inner cylinder, a concentrate tank located on the upper portion of the outer cylinder, a countercurrent mineralization mechanism arranged in the inner cylinder and a tailing separation mechanism connected to the bottom of the inner cylinder. Through cooperation of the sawtooth disc self-suction dispersion impeller and the false bottom structure, local area circulation can be formed, the elution effect on the surfaces of coarse particles can be enhanced, meanwhile, dispersion of heterogeneous fine silt is facilitated, and the purity of tailings is further ensured; according to the method, the flotation efficiency can be improved, and the energy consumption is greatly reduced; due to the design of the sawtooth disc self-suction dispersion impeller, gas is allowed to enter in a self-suction mode, and energy consumption of traditional air compression equipment is avoided. According to the sawtooth disc self-suction dispersion impeller, suction force brought by the vacuum effect generated by rotation of the impeller can be improved, and suction of more air is promoted.

The invention relates to the technical field of underground gas production, and discloses a metal sealing gas production wellhead device which comprises a body. A housing; the filtering assembly is used for circularly filtering gas in the wellhead; the self-discharging assembly is used for automatically discharging impurity particles attached to the filtering assembly; the filtering assembly comprises a screening device and an indexing rotating device; and the screening device is used for filtering gas impurities in the well. According to the metal sealing gas production wellhead device, drum-type double-layer filtering can be achieved through the arranged filtering assembly, so that it can be guaranteed that impurity particles in mined gas can be greatly filtered out, and the purity of the extracted gas is guaranteed. And the indexing rotation of the circular filter cartridge can be controlled by utilizing the indexing rotation device, so that the gradually blocked circular filter cartridge can be rotated, and clean filter holes face the underground again, and therefore, circulating automatic anti-blocking screening is carried out, and the operation stability of the gas production wellhead device is ensured.

The invention relates to a catalyst for ethylene oxide ring-opening polymerization and a preparation method thereof, and belongs to the technical field of high polymer material synthesis, and the catalyst is a composite structure based on a silicon dioxide nanoparticle loaded bimetal organic complex; a modified nitrogen-containing polydentate ligand is prepared by adopting a special method, is coordinated with metal ions through covalent bonds and is loaded on silicon dioxide nanoparticles; by utilizing the high dispersity and stability of the silicon dioxide nanoparticles and the synergistic catalytic effect of the bimetal organic complex, the catalytic effect is effectively improved, the polymerization process is accelerated, the polymerization stability is enhanced, the polymerization molecular weight is improved, and the distribution is narrow.

The invention relates to the technical field of water conservancy environment survey, in particular to sampling equipment for water conservancy environment survey and a sampling method thereof.The sampling equipment comprises a chassis, a sampling mechanism is installed at the top of the chassis, the sampling mechanism comprises a first motor, and the first motor is fixedly installed at the top of the chassis; a first threaded rod is fixedly mounted at the output end of the first motor, the supporting columns are fixedly mounted at the top of the chassis, the number of the supporting columns is two, a mounting plate is slidably mounted on the surfaces of the two supporting columns, the mounting plate is in threaded connection with the first threaded rod, and the second motor is fixedly mounted at the top of the mounting plate. Through arrangement of the sampling mechanism, disturbance of samples can be effectively reduced. When the first piston is inserted into sludge, the first piston can block mixing of surrounding sludge to a certain extent, the purity of the sample is kept, interference of external factors on the sample can be further reduced, and the obtained sludge sample can reflect the in-situ state more truly.

The invention belongs to the technical field of road engineering materials, and discloses a wide-temperature-range crack pouring adhesive based on rubber modified asphalt and a preparation method thereof.The wide-temperature-range crack pouring adhesive is prepared by taking the rubber modified asphalt as a matrix through a response surface method and adding SBS, basalt fibers and a modifier. The performance of the material is tested through a conventional test, and meanwhile, a test with more characteristics in northeast regions is provided, and the performance of the material is detected through injection depth, viscosity, low-temperature stretching after aging and freeze-thaw cycle stretching. Results show that a test designed by a response surface method has very strong reliability, and the modified heating type crack pouring adhesive added with the basalt fiber can significantly improve the high and low temperature performance of the crack pouring adhesive, and also has good anti-aging performance and freeze-thaw cycle resistance. And the filling depth and the viscosity of the sealant are not obviously lower than those of the same type of sealant.

The invention belongs to the technical field of preparation of electrode materials, and particularly relates to a high-tap-density spherical ferric sodium pyrophosphate electrode material and a preparation method thereof. According to the preparation method, a uniform precursor is prepared by utilizing solution gel, and a strategy of combining spray drying with secondary sintering is adopted, so that uniform carbon coating and doping modification of ferric sodium pyrophosphate can be successfully realized, and the strategy provides an important experimental basis for an industrialization process of a sodium ion battery. And the method has great potential of large-scale preparation.

The invention belongs to the field of chemical energy materials, and discloses a modified lithium iron phosphate positive electrode material and a preparation method thereof.The preparation method comprises the steps that a lithium source, an iron source and a zinc source are added into water to be stirred and dissolved, then a phosphorus source, a network gelling agent and an initiator are added, stirring reaction is conducted, and wet gel is obtained; and pre-decomposing the wet gel, grinding and sintering to obtain the modified lithium iron phosphate positive electrode material. According to the invention, Zn is introduced into the lithium iron phosphate positive electrode material, so that the olivine structure of the positive electrode material and the purity and consistency of the lithium iron phosphate positive electrode material are ensured; and Zn is oxidized into Zn < 2 + > to be doped into a lithium iron phosphate structure, so that vacancies are formed, the lithium ion diffusion rate and conductivity of the lithium iron phosphate positive electrode material are improved, the rate cycle performance of the prepared modified lithium iron phosphate positive electrode material is stable, and excellent discharge performance and stable rate cycle performance can be kept at low temperature.

The invention relates to a steel bar for an automobile transmission shaft based on an ecological electric furnace and a production method. The steel bar for the automobile transmission shaft comprises the following chemical components: 0.18-0.22% of C, 0.22-0.33% of Si, 0.85-1.00% of Mn, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 1.05-1.20% of Cr, less than or equal to 0.25% of Ni, less than or equal to 0.10% of Mo, 0.05-0.09% of Ti and less than or equal to 0.15% of Cu. And the balance of Fe and impurities. The production process comprises the steps of ecological electric furnace smelting, LF refining, RH refining, continuous casting, casting blank heating, rolling, heat preservation and heat treatment. According to the invention, a smelting continuous casting process of'ecological electric furnace + LF + RH + continuous casting 'is adopted, and is matched with a proper rolling process, so that the steel bar for the automobile transmission shaft, which is high in steel purity and excellent in mechanical property and surface quality, is produced, and the requirements of high-end products can be met.

The invention discloses a method for deeply removing readily oxidizable substances in high-purity electronic-grade phosphoric acid, which deeply removes the readily oxidizable substances in the high-purity electronic-grade phosphoric acid in a mode of combining ozone oxidation and resin adsorption to obtain a high-purity electronic-grade phosphoric acid finished product with extremely low readily oxidizable substance concentration. The specific process mainly comprises the following three steps: S1, introducing ozone gas at a certain temperature to oxidize readily oxidizable substances such as phosphorous acid and hypophosphorous acid in phosphoric acid into phosphoric acid so as to reduce the concentration of the readily oxidizable substances; s2, feeding the phosphoric acid subjected to ozone oxidation into an adsorption reactor to be in contact with an adsorbent, and further removing residual readily oxidizable substances in the phosphoric acid; and S3, filtering the phosphoric acid subjected to adsorption treatment through a filter element for separation, and removing residual small particles and impurities to obtain the electronic-grade phosphoric acid with readily oxidizable substances removed. The method is simple in process, controllable in condition, convenient to operate, safe and environment-friendly, does not need to add an additional solvent, avoids introduction of new impurities, reduces secondary pollution, and is suitable for preparing high-purity electronic-grade phosphoric acid.

The invention relates to the technical field of electrical digital data processing, and discloses a lightweight-based multi-modal data enhancement method, which comprises the following steps: acquiring a multi-modal feature tensor; extracting a vector orthogonal projection scalar and determining the novelty; updating the global covariance matrix when the novelty is greater than a redundancy threshold, and maintaining the global covariance matrix in a register state when the novelty is not greater than the redundancy threshold; extracting a main diagonal variance component to determine a differential modulation coefficient; calculating a second-order moment manifold projection operator according to the global covariance matrix, and calibrating the operator by using a differential modulation coefficient; the calibrated operator is used for carrying out orthogonal projection on random noise to generate a structured disturbance vector, the structured disturbance vector is superposed to a multi-modal feature tensor to output enhanced features, a novelty judgment mechanism is used for restraining statistical deviation caused by steady-state redundant data, computing resource occupation is reduced, and it is ensured that semantic alignment between modals is maintained in enhanced feature distribution.

The invention discloses a synthesis method of magnesium L-threonate. The synthesis method comprises the following steps: S1, preparing food-grade calcium L-threonate into an aqueous solution; s2, oxalic acid is added into the aqueous solution according to the molar ratio of 1: 1, and ultrasonic treatment is conducted for 30 min or above; s3, performing water bath treatment on the reaction mixed solution in a water bath at 0-4 DEG C, and then filtering to remove precipitates to obtain an L-threonic acid solution; s4, adding excessive magnesium oxide micro powder into the L-threonic acid solution, reacting, naturally cooling to room temperature, and filtering to remove precipitate to obtain an L-magnesium threonate solution; and S5, adding absolute ethyl alcohol into the magnesium L-threonate solution, then filtering to obtain a precipitate, washing the precipitate with absolute ethyl alcohol, and carrying out vacuum drying until the weight is constant, thereby obtaining the magnesium L-threonate. The invention further discloses the synthesis method and application in the pharmaceutical field. The synthesis efficiency is relatively high, the overall yield is also high, and it can be ensured that the purity of the synthesized magnesium L-threonate is high.

The invention relates to the technical field of copper plate strip machining, and provides an advanced copper plate strip continuous rolling technology which comprises the steps that S1, a copper ingot with the copper content of 99.9% or above is selected, and raw materials are obtained through saw cutting and surface polishing; s2, the treated copper ingot is heated in a heating furnace, and the internal temperature uniformity of the copper ingot is guaranteed; s3, a roughing mill is used for rolling the heated copper ingot, and rough rolling is conducted for 2-3 passes; s4, the copper strip subjected to rough rolling enters an intermediate rolling mill, and intermediate rolling passes are 3-5 times; s5, the copper plate strip subjected to intermediate rolling enters a finishing mill, and the finishing pass is 3-4 times; and S6, on-line cooling is conducted, specifically, the copper plate strip obtained after finish rolling enters an on-line cooling system immediately. Through early-stage accurate saw cutting and polishing treatment, the initial quality of the copper plate strip is guaranteed, smooth proceeding of subsequent rolling procedures is guaranteed, the multi-pass continuous rolling process of rough rolling, intermediate rolling and finish rolling is combined with online cooling, and through strict parameter control, the production efficiency is improved, the energy consumption is effectively reduced, and the production cost is reduced.

The utility model discloses a device for removing impurities in trichlorosilane, relates to the technical field of polycrystalline silicon production, and mainly aims to improve the removal efficiency of the impurities in the trichlorosilane on the basis of not increasing the cost. According to the main technical scheme, the device for removing the impurities in the trichlorosilane is characterized in that an inlet of a first mixer is connected to one end of a first feeding pipe and a second feeding pipe, a plurality of baffle plates are arranged in a reaction tank in a staggered mode and used for forming a baffle channel in the reaction tank, and one end of the baffle channel is connected to an outlet of the first mixer; the other end of the baffling channel, the filter and an inlet of the separating tower are sequentially connected, the inlet of the separating tower is further connected to a siloxane conveying pipe, a tower kettle of the separating tower is connected to the other end of the first feeding pipe and used for guiding siloxane to the first mixer, and a top collecting pipe of the separating tower is connected to the rectifying unit; wherein the second feeding pipe is used for guiding a trichlorosilane and dichlorosilane mixture containing impurities to the first mixer.

The invention discloses a method for realizing pure pore size regulation and control of a silicon carbide ceramic membrane, which comprises the following steps of: a) adding silicon carbide, sodium carboxymethyl cellulose and a dispersing agent into water, and uniformly ball-milling to obtain spraying slurry; and b) spraying the spraying slurry to the surface of a silicon carbide ceramic membrane to be regulated and controlled, naturally airing, carrying out vacuum drying at 75-85 DEG C for 2-5 hours, putting into a high-temperature furnace, carrying out vacuum sintering at 800-1200 DEG C for 1-3 hours, putting into a muffle furnace, and carrying out oxidation sintering at 700-900 DEG C for 25-45 minutes. According to the method, the pore size of the silicon carbide ceramic membrane can be subjected to pure regulation and control, operation is easy, cost is low, large-scale production is easy to achieve, the influence on the thickness of an original membrane is small, the membrane layer firmness is good, the filter flux of pure water is still high, and the application value of the silicon carbide ceramic membrane in water treatment is remarkably improved.

The invention discloses a method for increasing the phenol yield through catalytic pyrolysis of a decommissioned fan blade, and relates to the technical field of waste composite material resourceful treatment.The method comprises the steps that decommissioned fan blade fragment materials obtained after crushing and magnetic separation are subjected to multispectral imaging, multispectral data are obtained, and pretreatment is conducted; performing spectral feature extraction on the preprocessed multispectral data by using a convolutional neural network; identifying and separating the fragment materials based on spectral characteristics and automatic separation equipment; carrying out activation and carbonization treatment on the separated balsa wood fragments to prepare a carbon-based catalyst; carrying out catalytic pyrolysis on the separated fragment material by utilizing an automatic adjusting reactor and a carbon-based catalyst; collecting a product generated by catalytic pyrolysis, and carrying out qualitative and quantitative analysis on phenols to obtain a qualitative analysis result and a quantitative analysis result. According to the method, through a mode of combining multispectral imaging and the convolutional neural network, different types of composite materials are accurately identified and classified.

The invention discloses opaque quartz glass and a preparation method thereof. The preparation method comprises the steps that an induction heating furnace is used, the atmosphere in the furnace is a protective atmosphere which does not participate in the reaction, and the pressure of the protective atmosphere is 10000-90000 Pa; the quartz sand is placed in an induction heating furnace, the temperature is increased to 1400-1570 DEG C, and the quartz sand is preheated; raising the temperature to 1650-1710 DEG C at the speed of not more than 0.2 DEG C / s, so that the quartz sand is uniformly heated; raising the temperature to 1740-1900 DEG C at the speed of not less than 0.2 DEG C / s, so that the quartz sand reaches the melting temperature and is sintered; and finally, cooling at the speed of not more than 2 DEG C / s to obtain the opaque quartz glass. The density of the opaque quartz glass is 0.9-2.19 g / cm < 3 >, the bubble size is 1-300 [mu] m, the transmittance of the opaque quartz glass at the wave band of 380-3000 nm is less than 20% when the thickness is 2 mm, the transmittance of the opaque quartz glass at the wave band of 380-3000 nm is less than 3% when the thickness is 5 mm, and the hardness is 1000-6900 MPa.

The present invention discloses a method for improving tobacco leaf quality, and relates to the technical field of tobacco processing. A method for improving tobacco leaf quality of the present invention specifically includes the steps of preparing an enzymatic hydrolysis extract solution, a primary fermentation, and an alcoholization step, wherein composite flavoring particles are added in the step of preparing the enzymatic hydrolysis extract solution, the composite flavoring particles are based on magnetic ferric oxide / porous graphene oxide particles, and the pores of the matrix are filled with modified chitosan, lysine microcapsules are dispersed in the modified chitosan, and the modified chitosan is made of 2,3-epoxypropyltrimethylammonium chloride grafted modified chitosan. The present invention discloses a method for improving tobacco leaf quality, which can improve the smoking quality of tobacco leaves more comprehensively by using tobacco stem enzymatic hydrolysis extract solution and microorganisms, and has a better quality improvement effect.

The invention discloses a method and equipment for preparing high-purity electronic-grade hydrogen chloride from hydrogen-rich hydrogen chloride feed gas. The bid invitation comprises the following steps: (1) removing water through a two-stage deep freezer; (2) further removing water through adsorption of an adsorption tower; (3) rectifying: directly discharging gas-phase materials at the top of the tower, namely hydrogen, carbon dioxide and other non-condensable steam, into an alkali washing section; (4) introducing the material into a light component removal tower for further rectification, directly discharging a gas-phase material at the top of the tower, namely hydrogen chloride gas containing C1 and C2, into an alkali washing section, and circulating a material at the bottom of the tower back to the light component removal tower through a dehydrogenation tower; and (5) introducing the material into a heavy component removal tower for further rectification, directly discharging hydrogen chloride liquid containing chlorine and other high-boiling-point impurities in a tower kettle into an alkali washing section, and extracting a vapor phase at the top of the tower to obtain high-purity electronic-grade hydrogen chloride. According to the method, the load of the adsorption tower is reduced, and the treatment capacity per unit time is increased; the method has the advantages of simple process, low energy consumption, high recovery rate, easiness in stable preparation of high-purity electronic-grade hydrogen chloride, and facilitation of improvement of production scale and yield.

The invention relates to the field of electrolyte, and provides a lithium borohydride-lithium iodide composite solid electrolyte material as well as a preparation method and application thereof. The preparation method comprises the following steps: A, adding lithium borohydride into a solvent anhydrous tetrahydrofuran for dissolving, and then adding lithium iodide to form a uniform solution; b, transferring the solution into a closed container, and removing the solvent in vacuum until the solution is converted into a solid; and carrying out heating heat treatment to obtain the composite solid electrolyte material. According to the method, a liquid phase method is adopted, lithium borohydride is firstly added into an anhydrous tetrahydrofuran solvent, then anhydrous lithium iodide is added into the anhydrous tetrahydrofuran solvent, and trace water in tetrahydrofuran is removed by using lithium borohydride, so that the sample purity is ensured, and the ionic conductivity of the material is improved. The invention also provides an application of the lithium borohydride-lithium iodide composite solid electrolyte material in an all-solid-state battery.

The invention provides a screening device for rice processing, and relates to the technical field of rice processing equipment. The upper end of the side wall of one end of the screening machine box is of an outwards-protruding structure, the top of the outwards-protruding part is provided with an unhulled rice feeding port with the wide upper portion and the narrow lower portion, the unhulled rice feeding port communicates with an inner cavity of the screening machine box, and a horizontal stock bin supporting plate is fixedly arranged in the inner cavity, below the unhulled rice feeding port, of the screening machine box. A separating tongue plate is arranged at the edge of the inner end of the stock bin supporting plate, and a hinged shaft is arranged at the end, close to the stock bin supporting plate, of the separating tongue plate and rotationally connected into the screening machine box; and a feeding shaft is transversely and rotationally mounted at the position, deviating to the separating tongue plate, above the stock bin supporting plate. The rice is easily added into the screening machine box through the rice adding opening and falls on the stock bin supporting plate. After the motor is started, the feeding shaft rotates, and the feeding chute on the feeding wheel picks up the rice from the stock bin supporting plate and stably conveys the rice forwards along the inclined surface. By means of the design, uniform conveying of the rice is guaranteed, and the screening efficiency is greatly improved.

The invention relates to the technical field of electrolyte recycling, in particular to an electrolyte recycling device and method.The electrolyte recycling device comprises a filter box and a stirring box, a filter assembly is installed in the filter box and comprises two screws installed in the filter box, and a filter disc is in threaded connection between the two screws; a filter element is fixedly connected to the middle of the filter disc, a non-return membrane is fixedly connected to the middle of the filter disc, and a first motor is fixedly connected to the top end of the filter box; according to the scheme, impurities in the electrolyte are effectively filtered through vertical movement of the screw and the filter disc in the filter assembly, the electrolyte is separated out through the filter element under the action of pressure through the design of the filter element and the non-return membrane, meanwhile, the non-return membrane prevents the filtered electrolyte from flowing back according to the tricuspid valve principle of the heart, and therefore the filtering effect of the electrolyte is improved. And the unidirectivity and high efficiency of the filtering process are ensured, so that the recovery efficiency of the electrolyte is improved, the purity of the recovered electrolyte is also ensured, and subsequent reutilization is facilitated.

The invention relates to the technical field of sludge moisture content detection, and provides a sludge moisture content detection device. A sludge moisture content detection device comprises a base, a light-transmitting module, a diffused light emitting module, a diffused light detection module and an electric control system, the light-transmitting diffused light emitting module vertically emits diffused light to the light-transmitting module, and the diffused light is emitted into the surface of sludge to be detected; the diffused light detection module receives diffuse reflection light entering the light transmitting module through diffuse reflection of the diffused light in the to-be-detected sludge, converts the diffuse reflection light into an electric signal and transmits the electric signal to the electric control system, and the electric control system calculates the sludge moisture content based on a photoelectric signal and a diffuse reflection principle, so that the sludge moisture content can be detected in various sludge scenes. The water content in the sludge can be accurately measured on line in real time.

The invention relates to an impurity detection system for high-purity gas and a detection control method thereof, and the impurity detection system for the high-purity gas comprises a detection path selection module, a busbar sample introduction module, a chromatography pretreatment module and a moisture detection pretreatment module, the detection path selection module is connected with confluence path units contained in the busbar sample introduction module, the chromatography pretreatment module comprises a plurality of chromatography pretreatment units, the confluence path units are respectively connected with the corresponding chromatography pretreatment units, each confluence path unit is connected with the moisture detection pretreatment module, and the moisture detection pretreatment module is connected with the detection path selection module. The detection path selection module is used for acquiring storage information in a high-purity gas storage tank, and performing corresponding chromatographic analysis steps and / or moisture detection analysis steps on the high-purity gas according to the storage information; the opportunity and parameters of gas entering the detection equipment are automatically adjusted according to the storage states of different steel cylinders, so that the accuracy of a detection result is improved.

The utility model discloses a booster pump of a hydrogen compressor, which comprises a base, and a hydrogen compression cylinder, a driving system and a balance gas tank are arranged on the base. The driving system drives a piston in the hydrogen compression cylinder to move back and forth to compress hydrogen in the cylinder body; the hydrogen compression cylinder is a composite cylinder body; two independent compression chambers are symmetrically arranged in the hydrogen compression cylinder, the balance gas tank is used for balancing the two compression chambers, and a gas inlet and a gas outlet which are communicated with the compression chambers are formed in the hydrogen compression cylinder; and one-way valves are arranged at the air inlet and the air outlet, and efficient compression of hydrogen can be achieved through the double compression cavities which are symmetrically arranged.

The invention discloses a furan distillation and purification device for tetrahydrofuran raw materials, which comprises a distillation box, a preheating channel, a distillate flow guide assembly and a multi-stage filter assembly, and the multi-stage filter assembly comprises a first ultrafiltration membrane treatment mechanism, a second ion exchange resin treatment mechanism and a third molecular sieve treatment mechanism. The upper part of the feeding end of the distillation box is connected with a preheating channel, and inner inclined plates are arranged at the bottom of the distillation box and below the preheating channel. According to the furan distillation and purification device for the tetrahydrofuran raw material, when an existing furan distillation and purification device is used for treating a furan solution, although part of impurities can be removed, the purification effect is not thorough, and impurity residues still exist; meanwhile, the device is high in energy consumption in the distillation and extraction process and needs to depend on the combined use of a plurality of devices, so that the operation complexity is increased, the large loss is caused in the material conveying process, and the overall purification efficiency and the product quality are influenced.

The invention discloses an ultralow-temperature-resistant hydrogenated butadiene-acrylonitrile rubber tube rubber material and a preparation method thereof, and belongs to the technical field of butadiene-acrylonitrile rubber production. The ultralow-temperature-resistant hydrogenated butadiene-acrylonitrile rubber tube rubber material provided by the invention comprises the following raw materials in parts by mass: 100 parts of hydrogenated butadiene-acrylonitrile rubber, 65-80 parts of carbon black, 2-5 parts of zinc oxide, 1-2 parts of stearic acid, 8-12 parts of a low-temperature-resistant plasticizer, 1-3 parts of a vulcanizing agent, 1-2 parts of an accelerant and 2-5 parts of an anti-aging agent. The preparation method of the ultralow-temperature-resistant hydrogenated butadiene-acrylonitrile rubber tube rubber material comprises the following steps: adding hydrogenated butadiene-acrylonitrile rubber into an internal mixer, sequentially adding carbon black, zinc oxide, stearic acid and a low-temperature-resistant plasticizer, and continuously mixing for 4-5 minutes to obtain the rubber material; transferring the rubber material to an open mill, and adding a vulcanizing agent, an accelerant and an anti-aging agent to obtain a rubber compound; and vulcanizing the rubber compound, taking out the rubber material after vulcanization, and naturally cooling to room temperature to obtain the ultralow-temperature-resistant hydrogenated nitrile rubber tube rubber material.

The invention relates to the technical field of plasmid extraction, in particular to an automatic extraction method of endotoxin-free large-volume plasmid DNA and a kit. According to the kit provided by the invention, a magnetic bead adsorption technology and a buffer system with a unique separation effect are adopted, and specially modified protein is combined with magnetic beads, so that endotoxin and protein impurities can be adsorbed; an endotoxin removing solution is adopted, so that endotoxin can be efficiently removed; the method comprises the following steps: firstly, preparing plasmid DNA, then, uniquely embedded nucleic acid adsorption magnetic beads have very strong affinity to the plasmid DNA under a certain condition and are not easy to adsorb endotoxin, and when the condition is changed, the nucleic acid adsorption magnetic beads release the adsorbed plasmid DNA, so that the purpose of rapidly separating and purifying the plasmid DNA is achieved. The plasmid DNA extracted by utilizing the kit and the extraction method disclosed by the invention is high in yield, good in purity and extremely low in endotoxin content, and can be suitable for transfecting various cells and various conventional operations including enzyme digestion, PCR (Polymerase Chain Reaction), sequencing, connection and other various downstream experiment requirements.

The invention provides multi-section wastewater treatment equipment for photocatalytic degradation, and belongs to the technical field of wastewater treatment. Comprising a pretreatment device, a photocatalysis device, a separation and recovery device and a post-treatment device. By arranging the filter cartridge, the deformation ring, the conical filter screen, the arc-shaped top plate, an elastic sheet and a baffle ring II, after wastewater flows in from the water inlet, the arc-shaped top plate effectively disperses water flow, impurities are prevented from directly impacting the top of the conical filter screen to cause decomposition, and meanwhile, the arc-shaped top plate and the conical filter screen are driven to move downwards, so that the deformation ring forms a buffer inclined plane to further absorb impact energy; the filtering precision is greatly improved through double buffering; the deformation ring is linked with the baffle ring II through the connecting rope II, when wastewater flows in, the discharge hole is closed, impurity circulation is prevented, wastewater visibility is improved, photocatalytic degradation is enhanced, when the wastewater stops flowing in, the elastic piece resets the deformation ring, the baffle ring II is driven to open the discharge hole so that impurities can be discharged along with the treated wastewater, and filtering precision and photocatalytic degradation efficiency are improved; stable and efficient operation of the system is guaranteed.

The invention provides an anti-interference transformer with a cooling structure, and belongs to the technical field of transformers, the anti-interference transformer comprises a transformer main body, the transformer main body is connected with a reinforcing assembly, the reinforcing assembly comprises a transition box, one end of the transition box is provided with a heat dissipation cylinder, the lower end of the reinforcing assembly is provided with a backflow assembly, and the backflow assembly comprises a backflow box and a drain pipe. The transformer body is connected with a filter, the reinforcing assembly further comprises an extension cylinder, an ejector rod and a sealing baffle, and a telescopic spring is arranged in the extension cylinder; a swinging assembly and a position measuring assembly. The transformer cooling device has the beneficial effects that impurities can be removed and precipitated in the flowing cooling process of insulating oil so as to reduce damage to a transformer, the fan can be triggered to rotate along with temperature rise so as to improve the heat dissipation efficiency, meanwhile, dust can be removed so as to reduce accumulation of charges in the dust, and the service life of the transformer is prolonged. And electromagnetic interference and corona discharge are effectively reduced, so that the anti-interference effect of the transformer main body is improved.