138results about How to "Avoid contamination risk" patented technology

The invention discloses an experiment box for raw material medicine azacitidine, and relates to the technical field of experiment equipment, the experiment box comprises a box body and a sealing device, the left side of the box body is fixedly provided with a temperature control device, the left side of the temperature control device is fixedly provided with a button, the button is electrically connected with the temperature control device, and the front side of the box body is provided with a replacement hole. A replacing plate is slidably mounted on the front side of the box body, a sealing plate slidably penetrates through the right side of the box body, the sealing device comprises a limiting hole, a limiting rod, a limiting spring, a U-shaped rod, a T-shaped plate, a stabilizing plate and a net-shaped frame, and after an experimental container containing azacitidine is placed into the box body, the sealing plate is manually pulled to move leftwards to reset and recover sealing of the box body; when the azacitidine is degraded, moisture in air can enter the box body due to loosening of the sealing plate, so that degradation of azacitidine is accelerated, it can be ensured that the sealing plate is always tightly closed through mistaken touch prevention limitation of the T-shaped plate, and therefore the stability of azacitidine is ensured.

The invention provides a preparation method of rotaxane mechanical interlocking molecules. According to the preparation method, under the condition of not adding a catalyst, dibenzene-24-crown-8, benzene-21-crown-7, an isocyanate derivative and a rod-shaped compound are subjected to a reaction by adopting a one-pot method to obtain the rotaxane mechanical interlocking molecule. The preparation method not only can reach 100% of atom economy and meet the requirements of green chemistry, but also can reach the yield of 65% or above, and realizes efficient preparation of rotaxane mechanical interlocking molecules.

The invention discloses a sample adjusting device for a microbiological detection analyzer, and relates to the technical field of microbiological detection analysis, the sample adjusting device comprises a device main body, an inner cavity of the device main body is fixedly connected with a fixing plate, the fixing plate is fixedly connected with a servo motor, an output shaft of the servo motor is fixedly connected with a rotating disc, and the rotating disc is fixedly connected with a rotating shaft of the rotating disc. A crank is rotationally connected to the rotating disc, a loading table is rotationally connected to the end, away from the rotating disc, of the crank, a guide rail is fixedly connected to an inner cavity of the device body, and a first sample tube and a second sample tube are arranged on the loading table; in the process that the test tube moves to the position below the first sample tube and the second sample tube, a piston rod of a piston barrel moves, detection liquid in a liquid storage barrel is dropped into the test tube, meanwhile, the dropping quantity of the detection liquid can be adjusted and controlled, errors caused by different persons in manual operation are avoided, and the detection accuracy is improved. In addition, direct contact between operators and reagents and samples is reduced in the automatic process, and the risks of cross contamination and environmental pollution are avoided.

The invention provides an HPV16 and HPV18 nucleic acid detection kit based on a one-step two-channel RPA-CRISPR, and belongs to the technical field of cervical cancer detection. The kit for detecting the HPV16 and the HPV18 by the one-step method, provided by the invention, comprises an RPA (recombinase polymerase amplification) reaction reagent, a CRISPR (clustered regularly interspaced short palindromic repeats) / Cas13a detection reagent and a CRISPR / Cas12a detection reagent. The kit disclosed by the invention can be used for simultaneously detecting the HPV16 nucleic acid and the HPV18 nucleic acid on the basis of a one-step two-channel RPA-CRISPR / Cas12a-Cas13a, so that the multi-step transfer operation and the aerosol pollution risk of a two-step CRISPR reaction are effectively avoided, the HPV16 DNA as low as 2.5 copies / L and the HPV18 DNA as low as 5 copies / L can be detected in 30 minutes, and the specificity is good. The sensitivity of the kit for detecting cervix uteri and vagina swab samples is 94.7%, and the specificity is 100%.

The utility model relates to the technical field of thermal insulation boxes, in particular to a fully-assembled passive thermal insulation box inner temperature control chamber structure, which comprises a gel type PCM (Pulse Code Modulation) plate used for maintaining a specific temperature interval; the gel type PCM plate hanging bag is used for accommodating and fixing the gel type PCM plate; the supporting frame is used for supporting the gel type PCM plate hanging bag and comprises a top supporting rod, a vertical supporting rod, a bottom supporting rod and a supporting top plate, and all the parts are fixedly connected through bolts. According to the utility model, a temperature control chamber framework in the box body can be built and a gel type PCM can be fixed by matching with a hanging bag through a small number of standard general structural rod pieces and auxiliary components, the disassembly and assembly are simple and convenient, the operation convenience is improved, the rapid size switching of the box body is realized on the premise of not increasing any components, and the cost is reduced. The space utilization rate in the transportation and storage process is improved, the size of the box body can be flexibly changed and adjusted through the universal structural design, and the development time and cost of a new-size box type are greatly shortened and reduced.

The invention belongs to the field of biology, relates to a salmonella gene detection technology, and discloses a one-pot detection method combining LAMP (loop-mediated isothermal amplification) and CRISPR / BrCas12b mediated nucleic acid molecule detection. The method comprises the following steps: designing an LAMP primer, a small guide RNA (Ribonucleic Acid) and a transcription template overlapping PCR (Polymerase Chain Reaction) primer, performing loop-mediated isothermal amplification, constructing CRISPR / Cas shearing recognition (Cas-LAMP), constructing a single-tube one-pot reaction system of the CRISPR / Cas shearing recognition, detecting the specificity and sensitivity of Cas-LAMP amplification, and the like. In order to solve the technical problem that amplification and shearing recognition cannot be carried out synchronously, the invention provides a Cas-LAMP technology capable of linking two-step reaction of amplification and shearing recognition, and accurate, sensitive and rapid detection of nucleic acid molecules is realized in an in-vitro single reaction tube system. Compared with a traditional nucleic acid molecule detection method, the method has the following advantages that one-pot detection can be directly carried out without step-by-step operation, high sensitivity and strong specificity are achieved, and rapid field detection can be achieved. The method provides technical support for conventional nucleic acid detection, and has a wide field instant detection application prospect.

The embodiment of the invention provides a sterile nanobubble lavage fluid for cleaning silicone oil filled in eyeballs, and is characterized in that the sterile nanobubble-containing lavage fluid comprises nanobubbles with the size range of 100-500nm; the concentration of the nanobubbles is not lower than 2.0 * 10 < 7 > / mL. According to the sterile nano-bubble-containing lavage fluid, no chemical agent is used in the process of preparing the nano-bubble-containing lavage fluid and using the nano-bubble-containing lavage fluid to clean silicone oil in eyes, the risk of silicone oil removal operation is greatly reduced, residual silicone oil in the eyes can be safely and effectively removed, the existence time of nano-bubbles is longer, the nano-bubbles are easy to store, the silicone oil removal rate is higher, and the application range of the nano-bubble-containing lavage fluid is widened. The nano-bubble perfusate does not need to be prepared on site, can be prepared into the perfusate firstly, is stored under proper conditions and can be transported for a long distance, so that the risk of bacterial contamination caused by on-site preparation is avoided.

The invention discloses a low-pulsation rolling wheel internal rotation parallel multi-pipe peristaltic pump which is characterized in that an extrusion mechanism, a driving mechanism, a rolling wheel rotating mechanism and a pipeline mechanism are arranged on a mounting table plate, the pipeline mechanism comprises an inlet and outlet liquid distribution pipe and a hose, and the liquid distribution pipe is arranged outside the extrusion mechanism in the vertical direction; the hoses are arranged in the extrusion mechanism in parallel at equal intervals in the vertical direction, and the two ends of the hoses are connected with the liquid distribution pipes correspondingly; the roller rotating mechanism is positioned on the inner side of the hose and connected with the driving mechanism; the driving mechanism drives the roller rotating mechanism to rotate and extrude the hoses, the single-pipe-multi-pipe-single-pipe fluid conveying process is achieved, continuous and uniform time differences exist when all the hoses are extruded and loosened, and continuous low-pulse fluid conveying is achieved. The peristaltic pump has the advantages of being low in abrasion loss of the inner wall of the hose and high in continuous filling precision, pulsation during fluid transmission is effectively reduced, and the problems that in an existing peristaltic pump, due to the fact that the inner wall of the hose is seriously abraded, a large number of particles are generated, fluid is polluted, and the continuous filling precision is low are solved.

The invention belongs to the technical field of high polymer materials, and particularly relates to a low-viscosity self-adhesion protective film and a preparation method thereof. The protective film comprises an outer contact layer, a support layer and a self-adhesive adhesion layer. The outer contact layer is made of a modified elastomer material; the supporting layer is made of a modified polyolefin material; the self-adhesive layer is a modified acrylate hot-melt pressure-sensitive adhesive and comprises an acrylate monomer, a reversible cross-linking agent, a plasticizer, an initiator, a hindered phenol antioxidant, a hindered amine light stabilizer and a reaction control aid; the acrylate monomers comprise butyl acrylate, isobornyl methacrylate and hydroxyethyl acrylate, the reversible cross-linking agent is bis (2-methallyl) ethyoxyl disulfide, the plasticizer is a polyurethane elastomer, and the hindered phenol antioxidant is an antioxidant 1010; the hindered amine light stabilizer is a light stabilizer 770, the reaction control aid is diethyl hydroxylamine, and the initiator is di-tert-butyl peroxide.

The invention discloses a tubular double-membrane ammonia nitrogen removal and recovery device. The device comprises a shell, a cation exchange membrane and a hollow fiber hydrophobic membrane which are sequentially arranged from outside to inside, a wastewater inlet chamber is formed between the shell and the cation exchange membrane; a driving chamber is formed between the cation exchange membrane and the hollow fiber hydrophobic membrane; a recovery chamber is formed in the hollow fiber hydrophobic membrane; the hollow fiber hydrophobic membrane comprises a plurality of bunchy hollow membrane filaments, and a regulation and control device for adjusting the opening degree is arranged corresponding to an acid liquor inlet of the hollow fiber hydrophobic membrane, so that the number of the membrane filaments participating in acid liquor contact work can be adjusted. Due to the fact that the number of the membrane filaments is adjustable, waste of acid liquor and pollution of the membrane filaments are greatly reduced, meanwhile, due to the fact that the multiple membrane filaments are arranged, efficient mass transfer of ammonia gas is achieved, and the decontamination capacity and the recovery efficiency of the whole device are improved. In addition, due to the reasonable arrangement of the electric driving assembly, composite driving of an electric field and a concentration field can be formed, and then high-concentration ammonia-nitrogen wastewater is effectively treated.

The invention relates to a flame-retardant sponge based on a biomass flame retardant and a preparation method of the flame-retardant sponge. The flame-retardant sponge is prepared from the following components in parts by weight: 90 to 110 parts of polyether polyol, 50 to 90 parts of MDI (methylene diphenyl diisocyanate) or TDI (toluene diisocynate), 0 to 0.5 part of chain extender, 0.05 to 4 parts of efficient foam stabilizer, 0.05 to 0.5 part of efficient composite catalyst, 0 to 6 parts of external foaming agent, 1 to 5 parts of water and 0.1 to 2 parts of biomass flame retardant, the preparation method of the biomass flame retardant comprises the following steps: reacting sodium phytate with hydroxypropyl-beta-cyclodextrin, carrying out suction filtration, washing, and carrying out vacuum drying to obtain the biomass flame retardant of the phytic acid cyclodextrin ester. The preparation method has the advantages that the biomass material-grade halogen-free flame retardant is added in synthesis of a polyurethane flexible foam material, and phytic acid cyclodextrin ester with flame retardance is anchored to PU, so that a durable flame-retardant effect is achieved; the flame retardant is free of pollution and harm, the addition amount of the biomass flame retardant is small, the performance of the PU is not affected, and the effect of being free of smoke poisoning can be achieved.

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.

This invention provides a membrane-coupled distillation dehydration method and system for the recovery of electronic-grade ultra-high purity isopropanol, belonging to the field of wastewater treatment and isopropanol recovery technology. The method includes: S1 raw material pretreatment, S2 distillation concentration, S3 membrane separation dehydration, and S4 product output and quality control, recovering the latent heat of vapor at the top of the distillation column and the residual heat on the membrane permeate side for preheating the raw material and heating the membrane feed. The distillation module concentrates the isopropanol to near its azeotropic composition, simultaneously removing the main water and high-boiling-point impurities; the NaA-type zeolite molecular sieve membrane utilizes the molecular sieving effect to overcome the azeotropic limitation, deeply dehydrating to a water content ≤100ppm; variable-temperature operation is used to restore membrane flux online; and unqualified products are automatically refluxed for recycling. This invention eliminates the need for external azeotropic agents or extractants, achieving zero-additive, continuous operation, low energy consumption, and high-purity electronic-grade isopropanol recovery.

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 invention provides a transformer facilitating installation of a heat dissipation module, and relates to the technical field of transformers, the transformer comprises a fixed pipe installed on the side wall of a transformer body in a communicating mode, an external pipe is installed on a heat dissipation device in a communicating mode, and a cross sleeve and an attaching disc are installed in the external pipe and the fixed pipe respectively; the two cross sleeves are internally and slidably connected with push rods respectively, follow-up sleeves are coaxially installed on the push rods, opposite sleeves are coaxially arranged on the sides, close to the two follow-up sleeves, of the two follow-up sleeves, the modular design of the transformer body and the radiator is achieved through the design, and the detachable structure improves the transportation convenience of equipment; the damage risk of the large radiator in the transportation process is effectively reduced, and the transformer body and the radiator are separately transported, so that the transportation difficulty is reduced, the transportation cost is also reduced, and greater flexibility is provided for long-distance transportation and installation of equipment.

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 invention provides intelligent seed germination monitoring equipment with a circulating lifting mechanism, belongs to the technical field of artificial climate box equipment, and is used for solving the problems that in the culture process of an artificial climate box in the prior art, a traditional method for observing the culture condition is low in efficiency, and large-scale experiments are not facilitated. Comprising a climate box main body, a circulating lifting mechanism, a culture mechanism, a safety mechanism and a monitoring mechanism, according to the artificial climate incubator, the circulating lifting mechanism is installed in the artificial climate incubator to be matched with the intelligent high-definition camera, the observation efficiency of a culture is improved, the safety mechanism arranged on the outer side of the circulating lifting mechanism in a sleeving mode can prevent the culture mechanism from falling off, and the auxiliary box is additionally installed on the side wall of the climate box body to be matched with a push-out assembly in the culture mechanism; the culture dish is ensured to be always in a horizontal state by additionally arranging the annular positioning groove and the positioning roller, so that the problems of culture solution overflow, culture damage and the like caused by inclination are avoided, and the culture quality is further improved.

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 invention discloses a laser heating device for accurately controlling the temperature of a silicon material melting zone and the diameter of a silicon core, which comprises a furnace chamber, and an induction heating coil is arranged in the furnace chamber and is used for integrally heating a master batch rod; a plurality of lasers are arranged outside the furnace chamber and are used for preheating a master batch rod, or heating the master batch rod in different areas, or heating the bottom of a drawn silicon core; a plurality of light-transmitting openings are evenly formed in the side wall of the furnace chamber, and laser beams emitted by the laser irradiate into the furnace chamber through the light-transmitting openings so as to heat the master batch bar. The invention also discloses a method for heating the master batch rod by using the laser heating device. According to the method, the temperature of the silicon material melting zone can be accurately controlled, and silicon core diameter deviation caused by non-uniform induction heating is eliminated.

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 invention relates to the technical field of dairy leavening agents, and discloses a preparation method of a direct vat set yoghurt leavening agent with high fermentation activity, and the preparation method comprises the following steps: S1, scribing a fermentation strain in a flat plate for rejuvenation, screening a single colony, and preserving a preferred mother strain; s2, inoculating the preferable mother strain into a liquid culture medium, activating for two generations, then transferring into skim milk powder fermentation liquor, and culturing by using an acid-base neutralizing agent; s3, after fermentation is finished, adding a polysaccharide protection buffer agent, and uniformly mixing the polysaccharide protection buffer agent with the fermentation liquid under a low-temperature condition; s4, after the thalli are enriched through disc centrifugation, vacuum freeze drying is conducted, and the direct vat set yoghurt leavening agent is prepared. According to the method, two generations of screening are carried out on the activity of the zymophyte mother strain, then the fermentation activity and the stability of characters are guaranteed, a polysaccharide protection buffer agent is added into the fermentation liquor obtained after fermentation of the optimized mother strain, then disc type centrifugal treatment is adopted, mechanical damage of centrifugation to thalli is reduced, and the effective viable count and the fermentation activity in zymophyte powder are improved.