86results about How to "Avoid contamination risk" patented technology

The utility model belongs to the technical field of plasma rotating electrode powder manufacturing equipment, and relates to a vacuum dynamic sealing structure of a plasma gun for powder manufacturing, which comprises an external powder blocking module and a dynamic sealing module, the external powder blocking module consists of a first powder blocking plate, a powder blocking ring and an insulating powder blocking plate, the first powder blocking plate is fixed at the top of a plasma gun body to form an arc-shaped shielding surface, and the dynamic sealing module is fixed at the top of the plasma gun body. The powder retaining ring coaxially sleeves the positive electrode of the plasma gun body and forms an annular gap type powder blocking structure with the insulating powder retaining plate; the dynamic sealing module is sequentially provided with a dynamic sealing installation metal cylinder, an insulating cylinder and a sealing assembly from outside to inside in the radial direction of the plasma gun body, the insulating cylinder and the dynamic sealing installation metal cylinder form a step-shaped sealing structure, and vacuum sealing and electrical isolation are achieved between the dynamic sealing module and the external powder blocking module through bakelite and an O-shaped sealing ring. The vacuum dynamic sealing structure provided by the utility model has the advantages of powder isolation, reliable sealing, no burning loss short circuit and no need of vacuum grease auxiliary sealing lubrication.

The application discloses a swab collecting and transporting device for respiratory pathogen detection and relates to the technical field of medical devices.The device comprises a tube body and a tube cover, and the tube body is composed of an outer tube body, an inner container and a vacuum heat preservation layer; the inner container is provided with a U-shaped breaking gap at the container mouth, the gap is provided with a wedge-shaped cutting edge, and a limiting block provided with anti-skid serrations is arranged below; the container mouth is provided with a sealing flow blocking block and a rubber plug body, the plug body is provided with a medical hydrophilic liquid absorbing composite buffer layer at the bottom; and the outer tube body is provided with a real-time temperature display unit, which can adopt reversible heat-sensitive color-changing strips or waterproof miniature digital display modules.The wedge-shaped cutting edge and the limiting structure are used to realize accurate and labor-saving breaking of the swab, so that sample spatter and pollution are avoided; multi-stage sealing and liquid absorbing buffer layer double anti-overflowing can quickly absorb and inactivate leaked samples; vacuum heat preservation is combined with real-time temperature monitoring to guarantee the cold chain storage environment of the samples.The whole operation is convenient and safe, the device is suitable for clinical sampling processes, and the reliability of respiratory pathogen sample collection, preservation and transportation can be effectively improved.

The invention discloses a biosensor based on an ultraviolet light triggered bio-barcode release technology (OBCA) and construction and application of the biosensor. The biosensor comprises nucleic acid functionalized silver nanoparticles, nucleic acid functionalized magnetic beads and a CRISPR (clustered regularly interspaced short palindromic repeats) / Cas12a detection system, the DNA bar code modified on the surface of the silver nanoparticle contains a light cleavable linker, a CRISPR / Cas12a activation sequence and a target capture sequence I, and a DNA capture probe containing a target capture sequence II is fixed on the surface of the magnetic bead through biotin-streptavidin action. During detection, target miRNA mediates two capture sequences to form a sandwich compound, after magnetic separation and thermal denaturation elution, 365nm ultraviolet radiation releases DNA bar code fragments, and the Cas12a trans-cleavage fluorescence quenching reporter probe is activated to generate a signal. According to the method, nucleic acid amplification and reverse transcription are not needed, the detection limits of miR-21, miR-155 and mi-210 respectively reach 158.94 aM, 763.56 aM and 197.82 aM, single-base mismatch and precursor miRNA can be distinguished, the serum sample detection result is highly consistent with that of RT-PCR, and the method is suitable for high-sensitivity quantitative detection of miRNA.

This utility model discloses a self-locking hydraulic pipe joint, including a male joint and a female joint. The male joint has a pin, and a sealing sleeve and a spring are slidably fitted onto the surface of the pin. Under the action of the spring, the sealing sleeve can cover the connecting hole on the pin. A locking ring groove is provided on the outer wall of the pin. The female joint has an axially sliding valve core inside, which is connected to the spring and used to close the inner flow channel. The female joint also has multiple radially arranged locking pins, which cooperate with the locking ring groove of the pin to achieve mechanical locking. During the insertion process, the pin pushes the valve core back and compresses the spring, while the sealing sleeve backs to connect the connecting hole with the inner flow channel for flow. The locking pins automatically spring into the locking ring groove to achieve self-locking connection. The locking pins are made of ferromagnetic material and can be quickly unlocked by magnetic attraction from an external magnetic ring. This utility model has a compact structure, automatic sealing, self-locking, and quick unlocking functions, is easy to operate, and is suitable for hydraulic systems with high sealing and high reliability requirements.

The utility model relates to pharmaceutical equipment technical field especially relates to a kind of powder accumulation prevention wall cleaning device of spray drying tower.It is a kind of powder accumulation prevention wall cleaning device of spray drying tower, including main part, limiting screw rod, locking knob, sliding sleeve, first pivot, folding rod, brush and hinged rod, main part bottom fixed connection has limiting screw rod, limiting screw rod is threadedly connected with locking knob, locking knob bottom periphery fixed connection sliding sleeve, limiting screw rod lower end rotationally connects first pivot, first pivot periphery is cross-distributed rotationally connected with folding rod, folding rod outer end is all fixedly connected with brush, and each folding rod outer side top and sliding sleeve lower periphery between rotationally connected with hinged rod.The utility model is moved up and down along limiting screw rod by rotating locking knob and driving sliding sleeve, realizes the unfolding and folding of folding rod, improves the operation convenience and maintenance efficiency of equipment, reaches the effect that it is easy to operate and efficiently to complete drying tower inner wall cleaning.

The utility model relates to the field of docking platform discloses automatic docking platform mechanism, including frame and install docking platform bottom plate on the frame still include: mechanical arm, install in docking platform bottom plate, and the execution end of mechanical arm is equipped with the electric clamp jaw for grabbing material, placing rack, install in one side of docking platform bottom plate, be used for receiving and temporary storage material disc, AGV dolly, movable to the below of placing rack, in the utility model, through the accurate butt joint of lifting platform and placing rack, the automatic grabbing of mechanical arm electric clamp jaw, replace manual transfer material disc's operation, avoid the lens pollution or damage risk caused by manual contact, reduce manpower cost investment simultaneously, and the mechanical fixing of the orientation limit and positioning mechanism of U type opening structure, form multiple deviation prevention, prevent mistaken operation mechanism, ensure that material disc is from the position precision of transportation to feeding.

The rapid cooling and filling equipment for sauce production comprises a support, a barrel, an outer pipe, a cooling pipe and a sleeve, the support is provided with a platform used for bearing a bottle body, a transverse plate is arranged in an inner cavity of the barrel, an inner pipe is arranged in the center of the transverse plate in a penetrating mode, the inner pipe is connected with a filling needle nozzle extending out of the inner cavity of the barrel, and the filling needle nozzle is provided with a first switch; the outer pipe is located outside the barrel, the top end of the outer pipe is connected with the sauce conveying pipe, the bottom end of the outer pipe is connected with the inner pipe, the cooling pipe covers the outer pipe, the cooling pipe is provided with an inlet and a discharge port and used for introducing a cooling agent, and the cooling pipe is provided with a second switch; the sleeve body is movably arranged on the cylinder body in a sleeving mode, the sleeve body conducts centering action and releasing action on the multiple sets of clamping jaws, the centering action drives the multiple sets of clamping jaws to tighten inwards to clamp a bottle opening or a bottle neck of a bottle body, the bottle opening of the bottle body cannot deflect relative to a filling needle nozzle, and sauce cannot leak out in the subsequent filling process. And waste and pollution to the bottle body and equipment are avoided, and the use is convenient.

The application discloses a coated controlled-release fertilizer based on magnetic response intervention nutrient precise control release and a preparation method thereof, and belongs to the technical field of controlled-release fertilizers.The coated controlled-release fertilizer is prepared by using a magnetic response type biological base coating material as a film material, and the magnetic response type biological base coating material raw material comprises, by weight, 30-40 parts of vegetable oil polyol, 15-25 parts of a curing agent, 1-5 parts of a covalent network crosslinking agent, 2-6 parts of a hydrophobic crosslinking agent and 5-20 parts of a magnetic substance.The application can artificially control the film shell pores to realize precise release of nutrients, greatly improve the nutrient utilization rate, and meanwhile, after the nutrient release is completed, the film shell remaining in the soil can be recycled by physical magnetic attraction, which is efficient and environmentally friendly.The application realizes magnetic response precise control of nutrient release by hydrophobic modification, crosslinking degree enhancement technology and introduction of magnetic substances, can artificially intervene in dynamic matching of crop fertilizer requirement rules with the help of an external magnetic field, realizes efficient recycling of the film shell, and eliminates soil plastic residue pollution from the source.

The utility model discloses a kind of lens cleaning devices for 3D glasses production, more specifically in the technical field of glasses production equipment, including cleaning platform plate, the outside of cleaning platform plate is surrounded with lens conveying mechanism is set, the cleaning platform plate is opened with the installation through-hole that passes through up and down, the inner ring of installation through-hole is fixedly installed with ultrasonic cleaning machine shell, the top front side of cleaning platform plate is provided with flushing mechanism, air drying mechanism, the air drying mechanism is located at the back of flushing mechanism, the air drying mechanism is located at the front side of installation through-hole.The lens cleaning device for 3D glasses production of the utility model, by setting lens clamping mechanism, each lens is independently clamped between metal elastic clamping plate with rubber pad, avoid lens mutual contact or collision in conveying, cleaning, flushing and air drying process, significantly reduce the risk of lens surface scratch, improve product yield.

The utility model relates to the technical field of paste prescription production, and disclose a kind of mixing equipment for paste prescription production and processing, including conveying frame and placing box, the inside of conveying frame is equipped with mixing assembly, bubble-removing component and conveying mechanism, mixing assembly includes cylinder, first motor and pneumatic cylinder, and the output end of pneumatic cylinder is fixedly connected with scraper, the inside of cylinder is equipped with stirring mechanism, the utility model is integrated in one piece with mixing, scraping and bubble-removing function, effectively solve the defect of traditional craft: mixing assembly adopts first mixing stirring to ensure paste prescription material uniform mixing, avoid clumping, then realize automatic accurate scraping by scraper driven by pneumatic cylinder, and thickness control is accurate;Bubble-removing component is promoted by high-frequency vibration to make bubble float up and break quickly, and automatic process is completed after paste standardization is loaded into grid frame, to avoid pollution risk caused by material multiple transfer, significantly improve production efficiency.

This utility model relates to the field of copper smelting technology, specifically to a copper smelting flue gas acid production device, including a sulfidation reaction tank, a sulfidation thickener, several filter presses, and an emergency tank. The bottom inlet of the sulfidation thickener is connected to a feed pipe, and a control pump is fixedly installed at the other end of the feed pipe. The output end of the control pump is connected to the input ends of several filter presses via a diverter pipe. Air blowing pipes are installed at the top output ends of several filter presses, and return liquid pipes are installed at their bottom output ends. A control valve is installed at the path between the return liquid pipe and the air blowing pipe. This utility model, through the setting of the emergency tank, temporarily stores the solid-liquid mixture remaining after a filter press failure. This not only facilitates the handling of gas and liquid generated during the air blowing process but also effectively prevents the accumulation of solid-liquid mixture after a filter press failure, reducing the possibility of accidents and improving the reliability and safety of the entire filter press system.

The utility model discloses a kind of citric acid fermentation fine filter devices, belong to citric acid production technical field.Device is composed of fermentation unit and fine filter unit: fermentation unit contains seed tank and fermentation tank, the feed inlet of seed tank is connected with syrup turbid liquid pipe, the feed inlet of fermentation tank is connected with syrup clear liquid pipe and syrup turbid liquid pipe, seed tank and fermentation tank are configured with steam, compressed air, defoaming agent, emptying and circulating water pipeline.Fine filter unit first removes most solid impurities with primary plate-and-frame filtration, then ceramic membrane fine filtration and anion and cation exchange impurity removal.Two-stage filter-pressing acid residue is dried after being thickened and then filter-pressing to be feed, and two-stage filtrate respectively enters subsequent process.The device can greatly reduce labor cost and failure rate, improve citric acid purity and yield, and meet the needs of large-scale, high-quality and green production.

The utility model relates to the technical field of drying equipment, and discloses drying equipment for high-purity potassium feldspar production, which comprises a drying box, an air outlet pipe is fixedly sleeved in the top end of the drying box, a heating wire is arranged in the drying box, and fixing rings are fixedly mounted on the front side and the rear side in the drying box; and the driving mechanism is arranged in the outer surface of the drying box. According to the drying equipment for high-purity potassium feldspar production, due to the design of the turning mechanism, potassium feldspar can be in an uninterrupted motion state, so that it is guaranteed that all potassium feldspar particles in the box body can obtain stable and balanced heat supply, the drying quality difference caused by local overheating or supercooling is effectively avoided, the crystal structure integrity of the potassium feldspar particles is protected, and the quality of the potassium feldspar particles is improved. And the drying degree of the materials is ensured to reach the standard, the interference of water residues on subsequent processing technologies such as grinding and sorting is eliminated, and the stability and consistency of the product quality are remarkably improved.

The utility model discloses a river water condenser and ship, this river water condenser includes the casing, is equipped with circulating water import and circulating water export on the casing, and circulating water import and circulating water export all are linked to the shell inner chamber, and the casing both ends are connected with front end cover and tail end cover respectively, and the water inlet and water outlet are in parallelly arranged on the front end cover, and the cooling pipe is equipped in the casing, and the cooling pipe includes cooling inlet pipe and cooling outlet pipe, and the cooling inlet pipe is linked to the water inlet, and the cooling outlet pipe is linked to the water outlet, and the tail end cover is equipped with the self -cleaning mechanism, adopts the river water condenser of the utility model, and heat exchange effect is good, and the pipeline is few and is long in service life.

The utility model relates to dental equipment technical field especially is a kind of dental micro power device connector, including grinding teeth machine body, grinding teeth machine body surface is equipped with touch screen, the other side of grinding teeth machine body is fixedly provided with inner water tank, grinding teeth machine body surface is fixedly provided with inner water flow valve, and inner water flow valve is connected inner water tank and grinding teeth machine head by inner connection distilled water pipeline, one side of inner water tank is fixedly provided with fixed plate, fixed plate is fixedly provided with hanger, hanger surface is hung with disposable sterilization saline bottle, and disposable sterilization saline bottle is fixed with external tube plug by external sterilization physiological saline pipeline, independently connected distilled water pipeline and external sterilization physiological saline double waterway system of innovative design are realized seamless conversion of different treatment modes by one-key type switching valve, greatly improve clinical operation efficiency, avoid the cumbersome operation of traditional equipment needing manual replacement pipeline.

This utility model relates to the field of air sampling technology, and more particularly to a directional sampling and filtering device for atmospheric environmental detection. Its technical solution includes: a filter assembly, an intermediate chamber, and a gas storage assembly. The filter assembly is located at the bottom of the intermediate chamber, and the filter assembly consists of filter elements, a housing, and a rotating plate. The upper inner wall of the housing is threaded onto the lower outer wall of the intermediate chamber. The rotating plate is rotatably disposed within the housing, and each filter element is threaded at equal intervals onto the rotating plate. The gas storage assembly is located at the top of the intermediate chamber. The filter assembly consists of a cylindrical body, a piston slidably disposed within it, and two one-way valves. This utility model achieves the beneficial effects of high-efficiency purification, rapid replacement, and stable sampling through a multi-filter element rotation and replacement structure and a one-way filtration design.

The application relates to a purging device for a liquid preparation system and relates to the technical field of medicine liquid preparation. In order to solve the problem that a traditional purging device cannot completely purge, the purging device comprises a conveying pipeline, the inlet end of the conveying pipeline is provided with a compressed air supply source, the outlet end of the compressed air supply source is sequentially and serially provided with a pressure reducing valve and an electric heater along the conveying pipeline, a plurality of heating modules are arranged in the electric heater, the plurality of heating modules are vertically stacked along the height direction of the electric heater, a heating channel is formed in the electric heater from bottom to top, and a temperature gradient from low to high is formed when the compressed air flows through the heating channel. The application has the effects of effectively stripping the residual moisture on the surface of the system, improving the removal rate of the residual moisture and solving the microbial pollution risk caused by incomplete purging.

The invention belongs to the technical field of vacuum focusing, and relates to a focusing assembly for lunar remote Raman spectrum detection and a use method. Comprising a focusing group lens frame, a focusing optical lens is arranged in the focusing group lens frame, a main lens barrel sleeves the focusing group lens frame, a cam assembly is arranged outside the main lens barrel, the cam assembly penetrates through the main lens barrel through a guide nail and is fixedly connected with the focusing group lens frame, and a plurality of taper hole groups are formed in the outer wall of the focusing group lens frame. Taper holes in each taper hole group are distributed along a straight line parallel to the optical axis, the taper hole groups are uniformly distributed along the circumferential direction of the focusing group lens frame, supporting steel balls are arranged on the taper holes, a plurality of linear V-shaped guide rails are arranged on the main lens barrel, the linear V-shaped guide rails are in contact with the supporting steel balls, and dense steel balls are arranged between the main lens barrel and the cam assembly. An outer gear of the cam assembly is connected with the power assembly. Through steel ball point supporting isolation and full-dry type friction transmission design, pollutants are prevented from being generated in a light path, the problem of vacuum cold welding is effectively solved, and the remote focusing function is achieved.

The utility model belongs to the field of ampoule bottle production, particularly relates to an ampoule bottle up-and-down turnover mechanism, and provides the following scheme aiming at the problems that frequent shutdown adjustment is needed, the manual intervention cost is high and secondary pollution is easily caused in the production process due to the fact that an existing mechanism cannot realize continuous and automatic turnover of row ampoule bottles, the ampoule bottle up-and-down turnover mechanism comprises a fixed frame, two connecting frames are symmetrically and fixedly arranged on one side of the fixing frame, and a motor is fixedly arranged at the top of the fixing frame; the fixing frame and the two connecting frames are provided with overturning assemblies, and the overturning assemblies are used for overturning and conveying the ampoule bottles. According to the utility model, through the arrangement of the overturning assembly, the automatic up-and-down overturning function of the row ampoule bottles in the connection transition of production steps is realized, so that the process requirements of subsequent detection and packaging links are effectively met, and the continuity and the automation degree of a production line are also remarkably improved; meanwhile, pollution risks and efficiency bottlenecks possibly caused by manual overturning are avoided.

The invention relates to the technical field of cosmetic automatic production equipment, and discloses a cosmetic paste production line and a control system, the production line comprises a vacuum emulsification tank, a metering pump and a laminar flow impedance test tube, the test tube is provided with a pressure and temperature sensor, the tail end of the test tube is connected with a pneumatic three-way reversing valve, and the test tube is respectively communicated with a return pipe and a filling buffer tank. A rheology operation unit and a bimodal execution unit are arranged in the control system, and the rheology operation unit calculates the consistency coefficient and the flow behavior index of the paste in real time by utilizing a mapping model according to the rotating speed of the metering pump and the pressure difference of the test pipe. And when the indexes meet the qualified threshold value, the dual-mode execution unit is triggered to be switched from the cycle test state to the filling and discharging state. According to the method, the dynamic shear rate field is constructed on line, so that the hysteresis of off-line detection is eliminated, the self-adaptive closed-loop control based on the rheological property of the material is realized, and the quality consistency and the production safety of a high-viscosity non-Newtonian fluid product are ensured.

The utility model provides a kind of wafer temperature uniform control and automatic transfer integrated device in hot plate air extraction process, including disc-shaped cavity main body and automatic wafer transfer assembly, cavity main body top is plane structure, hot plate upper surface is perpendicular to the central axis of cavity main body, the sealing disc is coaxially arranged with cavity main body;It further includes air inlet and air outlet, air inlet is circularly opened in the sidewall top of the cavity main body;Air outlet is opened in the top surface center of the cavity main body.The utility model determines suitable cavity wall surface material by optimizing cavity structure, reasonably selecting air inlet and air outlet position, solves the problem of wafer temperature uneven in prior art, and realizes wafer automatic taking through intelligent automatic wafer transfer assembly structure under the form of not changing cavity structure, improves the quality and efficiency of semiconductor wafer manufacturing.

This invention provides a method for controlling Spartina alterniflora and promoting natural mangrove restoration based on rolling mulching and in-situ mud slurry, belonging to the field of ecological control technology. The method involves mechanically rolling Spartina alterniflora to flatten most of it and press it into the tidal flat soil. Then, a biodegradable mulch film is laid on top, and mud slurry is extracted and applied to form a mud slurry cover layer. A mangrove seed interception and planting device is then installed on the mud slurry cover layer to prevent mangrove seeds from growing naturally, thereby reducing the cost of Spartina alterniflora control and improving the efficiency of Spartina alterniflora control.

The head hanging device for the poultry slaughtering assembly line comprises a main shaft arranged in the vertical direction, a chain wheel is connected to the space above the main shaft, a plurality of hanging frames are arranged in the circumferential direction of the chain wheel, and the hanging frames are used for hanging poultry; the space below the main shaft is connected with a moving disc, a plurality of head pushing mechanisms are arranged in the circumferential direction of the moving disc, each head pushing mechanism corresponds to the position of the hanging frame in the vertical direction, each head pushing mechanism is provided with a hook, and the hooks are rotationally connected with the moving disc; the chain wheel and the moving disc are driven by the main shaft to rotate to a set position, the hook rotates, and the head of the poultry in an overhanging state below the hanging frame is turned over to the hanging frame, so that the head of the poultry is located at the high position of the hanging frame, and the state that the neck is bent and the trunk is transverse is formed. Automatic operation is achieved by simulating manual actions, the problem of wax dipping pollution is solved, and the device is more reliable.

This application relates to the field of waste recycling technology, specifically disclosing an enrichment liquid extraction system and method. The system includes: a mother liquor tank, a return liquid tank, a filter press, a reaction vessel, a resin tank, and a controller. The mother liquor tank is connected to the filter press. The reaction vessel is equipped with: a reaction liquid port, an auxiliary material port, a resin port, and a discharge port. The reaction liquid port is connected to the filter press. The auxiliary material port valve is connected to the cleaning liquid port, the desorption liquid port, and the neutralization liquid port. The resin port is connected to the resin tank. The discharge port is connected to the waste liquid port, the enrichment liquid port, and the return liquid tank via valves. Valves are provided at the reaction liquid port, the auxiliary material port, and the discharge port. By controlling the opening and closing of each valve through the controller, the feeding, addition of auxiliary materials, and liquid discharge of the reaction vessel can be controlled, realizing automatic control of material transfer during the enrichment liquid extraction process. This avoids the safety and pollution risks associated with manual feeding and material transfer, and effectively reduces the labor intensity of workers while improving production efficiency.

The discharging mechanism comprises a discharging box, a discharging plate is obliquely arranged in the discharging box, a discharging pipe is arranged above the upper end of the discharging plate, the upper end of the discharging pipe penetrates through a top plate of the discharging box and extends out of the interior of the discharging box, and a discharging opening is formed in the bottom of the discharging box. A blower is installed at the position, located below the discharging pipe, of the discharging box, an air suction port is formed in the position, opposite to the blowing direction of the blower, of the discharging box and communicates with a dust collector, particle materials discharged by the granulator can fall onto the discharging plate through the discharging pipe, and the particle materials falling onto the discharging plate can roll down from the discharging plate and are discharged through a discharging port. Meanwhile, dust in the particle materials can be blown away through an air blower, can be blown into an air suction opening and is collected through a dust collector, pollution and health risks caused by the dust in the particle materials to the working environment and operators can be avoided, meanwhile, dust can be prevented from being attached to the surfaces of the particle materials, and it is ensured that the appearance and quality of the particle materials meet the requirements.

The invention belongs to the technical field of sampling devices, and discloses a sampling device for liquid medicine detection and a method thereof.The sampling device comprises a spherical medicine storage body, the lower portion of the spherical medicine storage body is communicated with a liquid suction pipe, a top pipe is arranged above the spherical medicine storage body, and a limiting plate is rotationally installed between the top pipe and the spherical medicine storage body in a sealed mode; the top pipe and the spherical medicine storage body can be isolated and sealed through the limiting plate, a liquid taking assembly is fixedly installed in the center of the top pipe and vertically extends to the bottom end of the interior of the liquid suction pipe, extraction and discharging of medicine liquid are completed through rotation, and a stirring assembly used for homogenization pretreatment of the medicine liquid is rotationally installed at the upper end of the top pipe. A swing assembly capable of expanding the stirring range is integrated on the stirring assembly, and a driving device used for providing power and achieving function switching is arranged on the top pipe; the liquid medicine stirring device is simple in overall structure, can efficiently and uniformly stir liquid medicine which is easy to layer and high in viscosity, eliminates stirring dead angles, and improves the using effect.

The invention provides a method for nanofiltration separation of vanadate radicals or multiple vanadate radicals and sodium ions from a vanadium solution, relates to the crossing field of hydrometallurgy resource recovery and membrane separation technologies, and aims to solve the technical problems of poor separation selectivity of vanadium and sodium in the vanadium solution, low resource recovery rate and high energy consumption in the prior art. According to the method, suspended impurities in a vanadium solution are removed through pretreatment, and an acid and alkali resistant modified polyamide composite nanofiltration membrane is selected for nanofiltration separation, so that a high-vanadium concentrated solution and a high-sodium permeate solution are obtained. According to the method, the vanadate radical rejection rate is larger than or equal to 98%, the sodium ion transmittance is larger than or equal to 80%, the high-sodium permeate liquid can be circularly used for preparing a leaching agent / regenerant, the energy consumption of solution treatment per ton is only 25-37.5% of that of a traditional process, secondary pollution is avoided, the process is simple, the method is suitable for industrial production, and the economical efficiency and environmental friendliness of the sodium modification vanadium extraction process are remarkably improved.

The application discloses a device for clamping batch digestion beakers, and belongs to the technical field of laboratory apparatuses, comprising: a vertical clamping mechanism, comprising a rod sleeve, a pull rod and a clamping plate, the clamping plate is hinged to the pull rod, and is used for realizing vertical clamping; an active cleaning module, comprising a scraper folded on the side surface of the clamping plate, and used for actively cleaning the beaker. The vertical clamping mechanism of the application realizes one-hand operation clamping through the mechanical structure of the rod sleeve, the pull rod and the clamping plate, and then realizes the effect of simplifying operation, while the scraper of the active cleaning module is unfolded by using the energy of clamping action, and the beaker is cleaned in time through friction before moving and working, the clamping plate displacement linkage triggers the scraper action, so that clamping transfer and surface cleaning are completed in sequence in a single operation, the experimental efficiency is improved, and the pollution risk is avoided.

This invention discloses a pesticide residue detection sample oscillation extraction device with solid-liquid separation function, relating to the field of detection equipment. When extracting pesticide residue samples using this device, the sample to be tested is placed in a combined testing cylinder, and a clamping and positioning component clamps the lower clamping plate. A motor drives a rotating plate, a placement cylinder, and the combined testing cylinder to rotate via a telescopic cylinder. Because the lower clamping plate is wavy and annular, the rotating plate vibrates up and down, and the combined testing cylinder vibrates along with the plate, ensuring that the substances in the sample are fully dissolved in the solvent within the combined testing cylinder. When solid-liquid separation is required, the clamping and positioning component is moved to another slot, clamping the upper clamping plate. Because the upper clamping plate is circular and annular, the rotating plate drives the combined testing cylinder to rotate at high speed, achieving solid-liquid separation through high-speed centrifugal force.

The application discloses a back contact photovoltaic module and a preparation method thereof. The method comprises the following steps: providing a cell piece and a solder strip; the cell piece is provided with a main grid; the solder strip is stretched, and tin paste is sprayed on one side surface of the solder strip; the tin paste sprayed on the solder strip is pre-solidified to connect the tin paste and the solder strip; one side of the solder strip, on which the tin paste is sprayed, is attached to the main grid of the cell piece and heated to remove the tin paste, so that the main grid of the cell piece and the solder strip are fixedly connected to form a cell string; and the cell string is encapsulated and laminated to form the back contact photovoltaic module. By pre-solidifying the solder strip with the tin paste, the tin paste is preliminarily solidified, the initial temperature difference between the solder strip and the cell piece is reduced, the welding stress is reduced, the probability of hidden cracks in welding is greatly reduced, and the performance of the photovoltaic module is ensured.