131 results about "Vortex mixer" patented technology

The present invention provides a process for producing lipid nanoparticles encapsulating therapeutic products, said process comprising: a) providing one or more aqueous solutions in one or more reservoirs; b) providing one or more organic solutions in one or more reservoirs, wherein one or more of the organic solutions contains a lipid and wherein one or more of the aqueous solutions and / or one or more of the organic solutions includes therapeutic products; c) mixing said one or more aqueous solutions with said one or more organic solutions in a first mixing region, wherein said first mixing region is a Multi-Inlet Vortex Mixer (MIVM), wherein said one or more aqueous solutions and said one or more organic solutions are introduced tangentially into a mixing chamber within the MIVM so as to substantially instantaneously produce a lipid nanoparticle solution containing lipid nanoparticles encapsulating therapeutic products.

An automated hot beverage dispensing machine and method for producing hot beverages is shown. The preferred apparatus includes a plurality of flavoring reservoirs connected through pumps and valves to a plenum that dispenses the flavoring directly into a mixing chamber. The mixing chamber also receives milk and steam, facilitating mixing of the milk, steam, and flavoring, and dispensing the mixture into a serving cup. The dispensing machine may include a coffee brewing system, whereby the machine can produce flavored lattés, cappuccinos, and the like. In the preferred embodiment, pressurized steam is directed through a Venturi assembly that draws in refrigerated milk and ambient air and delivers the fluids to a vortex mixer to produce steamed and / or foamed milk. The flavoring is delivered to the vortex mixer, and steam is channeled to the plenum to facilitate delivery of the flavoring and maintain the cleanliness of the plenum.

An improved suspension apparatus and method for damping vibration arising in liquid vortex mixers of the type pivotably supporting a mixing frame assembly and suspending the assembly by at least one spring for mixing a liquid coating using both spin and orbital rotational movements. A pivoting support is located between the mixing frame assembly and a base. A damper in the form of an annular ring is used to damp pivoting movement of the mixing frame assembly. Various pivoting mounts may be used to pivotably support the mixing frame on a base. A bushing provides accommodation of a misaligned spring mounting end turn using a V-groove to retain the spring mounting end turn, and may include an eccentric feature to allow adjustment of the spring mounting length.

The invention discloses preparation and an application of an MOF-derived porous carbon / graphene composite electrode material. The preparation method comprises the steps as follows: (1) a clean container is taken, a graphene or graphene oxide dispersion liquid is added, then, MOFs crystal powder is added, the container is placed on a vortex mixer for continuous mixing after being sealed, the rotating speed is adjusted repeatedly from zero to the highest rotating speed, so that a sample is fully oscillated in the vertical direction, formation of a graphene sheet or graphene oxide sheet self-assembly three-dimensional structure and full and uniform dispersion of MOFs crystals in the three-dimensional frame structure are promoted, and finally, graphene / MOF porous aerogel is obtained through freeze drying; (2) the aerogel is subjected to high-temperature roasting in the N2 atmosphere and a carbonized product is obtained; (3) the carbonized product is subjected to acid treatment and the MOF-derived porous carbon / graphene composite electrode material is obtained. The MOF-derived porous carbon / graphene composite electrode material is applied in CDI or MCDI desalination and has good effects.

A method for producing a supercritical cryogenic fuel (SCCF) includes dissolving a hydrogen gas in fuel value proportions into a supercritical hydrocarbon fluid. The method is performed by placing a hydrogen gas and a hydrocarbon fluid at a pressure greater than the critical pressure of the hydrocarbon, placing the hydrogen gas and the hydrocarbon fluid at a temperature below or approximately equal to the critical temperature of the hydrocarbon forming the supercritical hydrocarbon fluid, and then mixing to dissolve the hydrogen gas into the supercritical hydrocarbon fluid. A system for performing the method includes a vortex mixer configured to turbulently mix the hydrogen gas and the supercritical hydrocarbon fluid. The supercritical cryogenic fuel (SCCF) produced by the method and the system includes the supercritical hydrocarbon fluid with a selected mole fraction of the hydrogen gas dissolved therein.

This invention provides a process for producing a nanocellulose-lignin material, comprising: providing a starting material comprising lignin and discrete cellulose fiber fines, chemically and physically separate from the lignin; and mechanically refining the starting material to form a nanocellulose-lignin material comprising cellulose nanofibrils and / or cellulose nanocrystals chemically or physically associated with the lignin. In certain embodiments, the starting material contains about 60 wt % lignin and about 40 wt % cellulose fiber fines on a dry basis. The starting material may be obtained from an AVAP® process. The refining may utilize single disk refiners, double disk refiners, conical refiners, cylindrical refiners, beaters, grinders, homogenizers, microfluidizers, vortex mixers, rotor-stator mixers, and / or high-shear mixers, for example. A novel nanocellulose-lignin composite material is obtained.

The present invention relates to a water quality purifying equipment formed from high-frequency pulse power supply, active oxygen generator, vortex mixer and infrared controller. It adopts the low-temp. plasma technique to produce the free radicals of active oxygen, and utilizes the technique of activating water particles and vortex-mixing lots of free radicals, at the same time uses induction control switch, safe isolated transformer, antispattering water-saving device and perform filter so as to make the complete equipment work have the advantages of stable and reliable preformance, high sterilization efficiency, quick speed, simple structure, having no residue and having no secondary pollution, so that it has extensive application.

The invention discloses a gas-solid mixed heat carrier quick pulverized coal pyrolysis process and a device. The device includes a diameter variable pyrolysis reactor, the top outlet of the pyrolysis reactor is provided with a pyrolytic oil gas collector, a vortex mixer is hidden in the middle part, a breathable heat storage layer is arranged at the lower part, two hot semicoke outlets are arranged at the bottom, one outlet is used for discharging hot semicoke, and the other outlet is connected to a tobacco pipe type refeeder, the tobacco pipe type refeeder is connected to a simple separator through a combustion lift pipe, the bottom of the simple separator is provided with an L-shaped high temperature semicoke control valve, the bottom of a dry raw material coal bunker is equipped with an L-shaped dry raw material coal control valve, outlets of the two valves are respectively connected to two inlets of the vortex mixer, the pyrolytic oil gas collector is in connection with an oil gas inlet manifold box of a box type multi-tube cyclone dust collector, the outlet of the box type multi-tube cyclone dust collector is connected to a high temperature centrifugal fan, the outlet of the high temperature centrifugal fan is connected to the L-shaped dry raw material coal control valve and the L-shaped high temperature semicoke control valve. Therefore, disadvantages of the prior art are overcome.

The invention discloses a device based on a microorganism electrolytic tank technique for on-line biochemical oxygen demand measurement. The device comprises a microorganism electrolytic tank, a constant potential meter, connecting tubes, a liquid conveying pump, a hydrocyclone, an automatic sample diluter, a static vortex mixer, an on-line degassing machine, a liquid storage tank, an incubator, a computer and a control system, wherein the computer and the control system are respectively connected with a microorganism electrolytic tank sensor; the microorganism electrolytic tank is connected with the liquid conveying pump, the hydrocyclone, the automatic sample diluter, the static vortex mixer, the on-line degassing machine and the liquid storage tank through the connecting tubes. As the influence of oxygen is eliminated, the device disclosed by the invention has the advantages of high sensitivity, short detection time, wide linear range, low limit of concentration detection, simplicity in operation and the like, the biochemical oxygen demand can be measured on line, and the monitoring level is greatly improved.

An improved suspension apparatus and method for damping vibration arising in liquid vortex mixers of the type pivotably supporting a mixing frame assembly and suspending the assembly by at least one spring for mixing a liquid coating using both spin and orbital rotational movements. A pivoting support is located between the mixing frame assembly and a base. A damper in the form of an annular ring is used to damp pivoting movement of the mixing frame assembly. Various pivoting mounts may be used to pivotably support the mixing frame on a base. A bushing provides accommodation of a misaligned spring mounting end turn using a V-groove to retain the spring mounting end turn, and may include an eccentric feature to allow adjustment of the spring mounting length.

The present invention relates to new technology of producing capillary chromatographic column sieve plate simply, fast and in low cost and reliable and efficient column filling method. Compared with available technology, the present invention has the following advantages: the utilization of common efficient liquid chromatographic connection tube suitable for filling milligram level stuffing as homogenating tube and vortex mixer with high efficiency and no stuffing lamination for vibration; the utilization of stainless steel or engineering plastic tube capable of being bent into U-shape before filling resulting in easy operation; and utilization of high pressure lab constant-flow pump for filling resulting in high column filling efficiency and low cost.

A method for measuring the content of melamine in a solid sample uses a portable Raman spectrometer to directly measure Raman spectrum for the solid sample. The method specifically includes the following steps: 260 to 300 mg solid sample to be measured is weighed and loaded in a glass tube for testing, and the cover is closed; the solid sample is fully mixed for 2min on a turbine mixer and is inserted on a sample holder of the portable Raman spectrometer; and the Raman spectrum in the range of 450 to 1050 cm is recorded. The method is convenient, practical and economical without pretreatment process, thereby having quick measurement and being applicable to field high-flux detection; the method is portable, needs few consumption of sample, and can be qualitative and quantitative; and the method is particularly applicable to monitoring and detection for high concentration melamine added milk source at milk source gathering stations.

The invention discloses an underwater multifunctional feeding device for ocean net cage culture. The underwater multifunctional feeding device is suitable for multifunctional underwater feeding of a full-floating net cage, a semi-submersible net cage and a bottom-sitting net cage. The device comprises a cyclone vortex mixer, seawater pipelines, a main feeding pipeline and feedstuff feeding manifolds, wherein the cyclone vortex mixer comprises an air-assisted feed dispersing bin and a seawater turbine bin; the seawater turbine bin comprises a plurality of seawater inlets and a vortex guide plate, and the bottom of the vortex guide plate is connected with the main feeding pipeline; the upper end of each seawater pipeline communicates with the corresponding seawater inlet, and the lower end of each seawater pipeline is connected with a seawater submersible pump immersed in seawater, so that seawater is pumped into the seawater turbine bin to form a vortex rotating downwards, and feed is driven to enter the main feeding pipeline; and the multiple feedstuff feeding manifolds are arranged at the lower end of the main feeding pipeline, so that the feed in the main feeding pipeline can befed into an aquaculture water space in a multi-point mode through the feedstuff feeding manifolds.

The invention discloses a detection method for antibiotic residue in milk. The detection method comprises the steps of (1) taking and adding 2 to 4mL of milk into a centrifuge tube, adding 0.3 to 0.5g of demulsifying agent, ultrasonically oscillating for 15 to 30min, then adding 10 to 20mL of ethyl acetate, uniformly dispersing, adding 10 to 30mL of phosphate buffered solution, ultrasonically extracting for 10 to 20min, centrifuging, then transferring 5mL of liquid supernatant, adding 5mL of phosphate buffered solution, uniformly mixing, then dissolving in a sodium hydroxide solution or a potassium hydroxide solution, adding methylbenzene for extraction and taking an upper solution as a standard solution; (2) transferring the standard solution in the step (1) to a solid phase extraction column, leaching by using 5mL of water and 5mL of methanol aqueous solution in sequence, discarding effluent, decompressing and pumping, then eluting with 5mL of methanol and collecting eluant. Blowing to nearly dry with nitrogen at 50 DEG C water bath, adding 5mL of acetonitrile water solution, mixing by a turbine mixer, and obtaining filter liquor through a microfiltration membrane for being detected; (3) adding the filter liquor into a gas chromatograph for detection. The detection method provided by the invention can effectively improve detection result accuracy and provides guarantee for food safety.

The invention provides a urea vortex mixer comprising a cylinder. The main improvement on the urea vortex mixer is that the two ends of the cylinder are both open, one end is used as an intake opening, and the other end is used an exhaust opening; a Z-shaped baffle is arranged in the cylinder, the inner cavity of the cylinder is divided into a front cavity and a back cavity, a vortex piece and a porous pipe are arranged in the cylinder, the vortex piece and the porous pipe are connected to the transverse portion of the Z-shaped baffle and communicate, the vortex piece is located in the front cavity of the cylinder, the porous pipe is located in the back cavity of the cylinder, the vortex piece is provided with vortex blades, the top end of the vortex piece is connected with a spray nozzle,the spray nozzle extends out from the circumference face of the cylinder, and the pipe wall of the porous pipe is provided with multiple air holes. The urea vortex mixer enables urea to be completelyhydrolyzed, the urea is not prone to crystallization, the backpressure is low, and the well-knit rhythm is achieved.

The invention discloses a method for detecting benzoic acid in food. The method comprises the following steps of 1) crushing or grinding a food sample by utilization of a medical crusher; 2) taking 1 g of the food sample processed in the step 1, adding 0.5 ml of NaOH solution withconcentration of 1 mol / L, and diluting with water to a volume of 20 ml; 3) mixing the diluted solution through a vortex mixer, putting the mixed solution into a centrifugal tube with a volume of 100 ml for centrifugation, and taking supernate; 4) adding 10 ml of ethyl acetate and 10 ml of normal hexane into the supernate, and separating an oil phase from a water phase after stirring the supernate for a period of time; 5) taking the water phase to perform high-performance liquid chromatographic determination. The invention aims to provide the method for detecting the benzoic acid in the food, which has the advantage of accuracy in measurement.

The invention relates to the technical field of molecular biology, in particular to a method for extracting soil microbial genome DNA. The method comprises the following concrete steps: a soil sample and quartz sand are mixed and put into extracting buffer solution in a centrifugal tube, and the centrifugal tube is placed in a nucleic acid extraction apparatus for vibrating for 40-60 seconds, or on a turbine mixer for vibrating for 10-20 minutes; the mixture obtained is added with 50-100mul of lysozyme, treated by warm bath at the temperature of 30-40 DEG C for 30-60min, added with 75-125mul of SDS and mixed evenly, and further treated by the warm bath at the temperature of 50-60 DEG C for 30-60min, and supernatant is obtained after centrifugation; and the supernatant is further extracted and purified to obtain the soil microbial genome DNA. The soil microbial genome DNA extracted by the method has high purity, the OD260nm / OD280nm can reach over 1.6, the output can be up to 100ug / ml, and the whole process takes about 10 hours; the method can be directly used for PCR reproduction without purification kit for further purification in the whole process; and by taking the obtained DNA as a template, and the target product can be smoothly reproduced.

The invention relates to a diesel engine exhaust gas after-treatment device, and provides a horizontal box type maintainable exhaust gas after-treatment device for a ship engine. The horizontal box type maintainable exhaust gas after-treatment device comprises a gas inlet pipe, a urea nozzle, a mixer, a tank body, a catalysis assembly and a gas outlet pipe, wherein the urea nozzle is arranged on the gas inlet pipe; the mixer comprises a vortex mixer and a split mixer which are oppositely arranged; the vortex mixer is connected with an inner end of the gas inlet pipe; the split mixer is arranged outside a front end cover of the tank body; the catalysis assembly is arranged in the tank body; a rear end cover of the tank body is connected with the gas outlet pipe. The horizontal box type maintainable exhaust gas after-treatment device has a compact structure, solves problems of arrangement and disassembly of a square industrial catalyst carrier, adopts a replaceable catalyst and cleanable urea crystals to reduce use costs, improves a urea mixing effect by two mixer structures, and solves problems of uneven urea mixing and high risk of urea crystallization of a ship engine after-treatment device.

The invention relates to a quantitative detection method for fat in food, and belongs to the measuring technical field. The method particularly comprises fatty acid methyl esterification operation and adopts the following method: weighing 0.5 g of an evenly-mixed walnut kernel sample, placing in a 50 mL centrifugal tube with a plug, adding 0.1 mL of 1:1 hydrochloric acid and 10 mL of n-hexane, covering with a lid of the centrifugal tube, carrying out sufficient oscillation for 3 min, carefully opening the lid, releasing gas, centrifuging for 10 min at a speed of 7000 r / min, sucking the supernatant with a rubber-head dropper to a test tube with a plug, and thus obtaining a n-hexane-fat liquid; and taking more than or equal to 2.0 mL of the prepared n-hexane-fat liquid in a 10 mL graduated test tube with a plug, adding 0.8 mL of a 0.5% KOH-methanol solution, carrying out sufficient oscillation for 2 min in a vortex mixer, allowing to stand for 2 min, and sucking the supernatant, namely a fatty acid methyl ester sample liquid. The method is simple to operate, allows the reaction to be carried out only at room temperature, has the advantages of good data repeatability and reproducibility, high precision degree and simple steps, reduces errors caused by incomplete extraction or methyl esterification, internal standard substance preparation and other many aspects, and has fewer error introducing factors.

A vortex oil and gas mixed delivery system with a function of casing natural gas recycling and crude oil delivering for oil wells relates to the recycling and delivering technology of casing natural gas and crude oil at wellheads and is applied to recycling casing natural gas, reducing kinematic viscosity in crude oil delivery, realizing uniform delivery of the natural gas and the crude oil in the same pipeline and reducing wax precipitation and blockage in crude oil delivery during crude oil exploration. By recycling the natural gas generated during crude oil exploration and pressurizing, the crude oil and the natural gas can be delivered mixedly, benefit of crude oil exploration is maximized, benefits and safety are guaranteed by the aid of pressurizing delivery of a gas delivery pump, flow-state optimization of a vortex mixer, full-automatic working control and safety protection.

The invention discloses a warm bath vortex mixer for reagent tubes. The warm bath vortex mixer comprises a base, a motor, a vibrating mechanism and a reagent tube placing box, wherein the motor is arranged in the base, the vibrating mechanism is connected with the motor, the reagent tube placing box is arranged at the upper end of the base, the lower end of the reagent tube placing box is fixedly connected with the vibrating mechanism, the reagent tube placing box is internally provided with a warm bath groove, a grid rack and a sealing cover plate are arranged at the upper end of the warm bath groove, the grid rack is horizontally arranged in the warm bath groove, the sealing cover plate covers the warm bath groove and is in sealing connection with the warm bath groove, a heating device is arranged at the bottom of the warm bath groove, the base is internally provided with a vortex mixer circuit, and the vibrating mechanism and the heating device are respectively connected with the vortex mixer circuit. By the manner, the warm bath vortex mixer not only can uniformly mix reagents, but also can provide a warm bath heat preservation function during mixing of reagents in the reagent tubes so as to guarantee the stability of the reagents.

The invention provides a vortex mixer for three phases including sewage, air and a chemical agent. The mixer comprises a main body, the main body is formed by embedding an inner cylinder with two sealed ends into an outer shell with two sealed ends, wherein the inner cylinder and the outer shell are respectively arranged vertically, an annular passage is formed between the inner side of the outer shell and the outer side of the inner cylinder, and the upper part of the side wall of the outer shell is provided with a water inlet communicating with the annular passage; the upper end of the main body is provided with an air inlet, the lower end is provided with a water outlet, and the air inlet and the water outlet respectively communicate with a mixing chamber in the inner cylinder; and through holes communicating with annular passage and the mixing chamber are uniformly distributed in the side wall of the inner cylinder. According to the vortex mixer having a unique structure for the three phases including the sewage, the chemical agent and the air provided by the invention, a water flow automatically forms a vortex, the vortex is dispersed and sufficiently mixed with the air in the inner chamber under the action of the through holes, so that the mixing efficiency is high.

The invention provides a detection method for antibiotic residues in meat products. The detection method comprises the following steps: (1) preparing homogenate from a to-be-measured meat product by using a pulverizer, placing the homogenate in a centrifuge tube, successively adding de-emulsifier, hexane and a phosphate buffer solution and carrying out ultrasonic extraction and centrifugation so as to obtain to-be-purified liquid; (2) transferring the to-be-purified liquid into a solid-phase extractioncolumn, carrying out purifying, collecting eluate, blowing the eluate with nitrogen in a water bath until the eluate is nearly dry, adding an aqueous acetonitrile solution, mixing the eluate with the aqueous acetonitrile solution in a turbine mixer, carrying out filtration with a microfiltration membrane and standing obtained filtrate for subsequent measurement; and (3) carrying out determination and affirmation by using liquid chromatography-tandem mass spectrometry and carrying out quantification by using an external standard method. The detection method for antibiotic residues in meat products can effectively improve accuracy of detection results and effectively guarantees food safety.

The present invention provides a sample preparation device for extracting drug residue. It comprises a case, in which a water bath, a vortex mixer, and a homogenizer are integrated. The case also has on it an integrated control panel for controlling heating temperature of the water bath and homogenization time of the homogenizer.

A method for detecting antibiotic residues in milk comprises the following steps: (1) the milk is placed in a centrifuge tube, a demulsifier, ethyl acetate and a phosphate buffered solution are added sequentially, a mixture is subjected to ultrasonic extraction, an extract is centrifuged, and a liquid to be purified is obtained; (2) the liquid to be purified is transferred to a solid-phase extraction column for purification, and an eluent is collected; the eluent is blown with nitrogen in a water bath until the eluent is almost dry, an aqueous acetonitrile solution is added, the materials are mixed on a turbine mixer, a mixture passes through a millipore filter, and a filtrate is to be detected; (3) an LC-MS (liquid chromatography-mass spectrometry) method is used for determination and confirmation, and an external standard method is used for quantification. According to the method for detecting the antibiotic residues in the milk, the accuracy of a detection result can be improved effectively, and beneficial guarantee is provided for food safety.

The invention relates to a quick measuring method of pyrethrin, which can quickly and effectively measure the content of the pyrethrin in dried flowers. The method comprises the following steps of: picking up 10-20 capitulums when tubular pyrethrum flowers bloom by 50-99 percent, and placing the capitulums into an oven at 40-80 DEG C for drying for 36-72 hours; pulverizing, then weighing 50-200mg of powder and putting the weighed powder into a glass centrifuge tube; adding 2-10mL of normal hexane, covering the glass centrifuge tube and then oscillating for 20-40s on a vortex mixer; placing the glass centrifuge tube in an ultrasonic water bath for 5-15min, taking out and then continuing to oscillating for 20-40s; centrifuging for 3-8min at a speed of 1,500-3,000 turns / min at room temperature of 20-25 DEG C; absorbing 0.1-0.5mL supernate, and metered by the volume, diluting for 40-80 times with absolute ethyl alcohol as a solution to be measured; measuring the light absorbing valve by an ultraviolet and visible spectrophotometer under the condition of a wavelength of 225nm; and calculating the content of the pyrethrin. The invention has the advantages of simple pretreatment, low testing cost, high speed and good accuracy and can improve the field breeding measuring efficiency and the selecting efficiency of good genotypes.

The invention discloses an electroantennogram reaction test method of corn borer female silkworm to corn plant volatile substances. The method comprises the steps of feeding asiatic corn borer by an artificial feed in an artificial climatic box, continuously breeding multiple generation, at the day when adults are subjected to eclosion, freely copulating the male worm and the female worm in a breeding cage according to the proportion which is not less than 2:1, feeding 10% hydromel to supply nourishment, and taking the female silkworms which copulate after 3 days as a experimental worm resource for test; selecting 20 kinds of corn volatile substance standard chemical compounds, dissolving each sample into liquid paraffin, adequately mixing in a vortex mixer, and preparing 5*10<-4>g / ml of solution for EAG test; and carrying out electroantennogram test on the worm resource for test. The method shows that the corn borer has different EAC reaction values to the different volatile matter components of the corn, and illustrates that the osmoceptor of the asiatic corn borer has different sensibility and selectivity to the smell from the host habitat, so that the basis for researching the oviposition attractant or repellent of the asiatic corn borer can be provided, and the novel pest control means can be explored.

The invention discloses a device of achieving denitration and multistage ammonia spray of SCR (selective catalytic reduction) flue gas and a flue gas denitration method. The device comprises a reactor body, wherein the reactor body sequentially comprises a first vertical section, a level connection section and a second vertical section in a flue gas flow direction; a flue gas inlet pipeline is arranged before the first vertical section; the second vertical section is internally provided with a plurality of layers of catalysts arranged horizontally; a flue gas outlet pipeline is arranged after the second vertical section; the first vertical section is internally provided with a first stage mixing and uniform distribution system; the second vertical section is internally provided with a second stage mixing and uniform distribution system; the first stage mixing and uniform distribution system comprises a vortex mixer and a plurality of ammonia spray pipes with nozzles over against a standing vortex area of the vortex mixer; the second stage mixing and uniform distribution system is arranged above the catalysts and comprises a plurality of high-pressure spray guns flushly and oppositely arranged on a front wall and a back wall of the second vertical section; and the high-pressure spray guns adopt conical multihole nozzles. The device and the method can effectively solve the problem of a concentration deviation of ammonia in a posterior-anterior depth direction of the reactor.

The invention relates to a biological sample pretreatment system. The system comprises a body, an upper computer arranged on the body, a scanning module, a vortex mixer, a positioning centrifugal machine and an on-line solid-phase extraction module, the scanning module, the vortex mixer and the positioning centrifugal machine are electrically connected with the upper computer in sequence, the on-line solid-phase extraction module is installed on the body, an opening for taking and placing a sample is formed in the positioning centrifugal machine, and after the sample is put into the positioning centrifugal machine and centrifuged, the sample can always correspond to the opening. The body is provided with a mechanical arm system, the mechanical arm system comprises a mechanical claw and a vertically arranged sample injection needle, after a sample is placed on the body, the sample injection needle can transfer liquid to the sample, and the mechanical claw completes taking and placing of the sample in the positioning centrifugal machine through the opening. The sample pretreatment device has the effects of automatically carrying out sample pretreatment, improving the working efficiency of sample pretreatment, reducing errors and improving the accuracy of test results.