36 results about "Separation time" patented technology

The buffering structure capable of being pneumatically separated is installed between an outer cover and protected equipment and is restrained on the periphery of the protected equipment through certain extrusion force between the outer cover and the protected equipment, and impact load energy transmitted to the protected equipment is reduced through deformation energy absorption of the buffering structure capable of being pneumatically separated. Impact protection of protected equipment on an aircraft can be achieved, normal work of the equipment is guaranteed by means of pneumatic load separation, the inverted-cone-shaped structure is arranged to increase the pneumatic load during separation, separation reliability is guaranteed, and separation time is shortened; the weak part of the protected equipment is avoided by optimizing the transmission path of the impact load, the protected equipment is more effectively protected, and meanwhile, the structural weight is effectively reduced.

The invention provides a separation control method and device and a storage medium. The method comprises the steps that a gear shifting request sent by a gearbox control unit is received; the current fuel injection amount is detected; if it is detected that the current fuel injection amount is smaller than the preset fuel injection amount, the current remaining fuel amount and the current engine rotating speed are obtained; based on the current residual fuel quantity and the current engine rotating speed, the target moment is determined, and the target moment is the moment when the engine torque is reduced to the first preset engine torque; and the target interaction information is sent to the gearbox control unit, the target interaction information comprises the target moment, and the target moment is used for the gearbox control unit to control the clutch to be separated. According to the embodiment of the invention, the target moment is determined through the current residual fuel quantity and the current engine rotating speed, so that the problem of improper separation time caused by clutch separation based on the output torque under the condition that the output torque is inaccurate is avoided, and the accuracy of the clutch separation time is improved.

The invention belongs to the field of medical isotope separation and preparation, and particularly relates to a method for separating and purifying < 212 > Pb from a thorium solution, which comprises the following steps: 1) leacheate is introduced into a Pb selective adsorption column to pretreat the Pb selective adsorption column, and then < 232 > Th salt solution and leacheate are introduced in sequence; 2) continuously introducing a desorption solution into the Pb selective adsorption column, enabling the desorption solution passing through the Pb selective adsorption column to flow into the Th selective adsorption column, and collecting the outflowing desorption solution; a desorption solution only containing 212Pb is obtained; according to the method, the 212Pb in the high-concentration thorium solution can be separated and purified at the same time. While < 232 > Th impurity entrainment and pollution in a < 212 > Pb product are remarkably reduced, compared with a single-column process, the separation time is basically not increased. The separated 212Pb product has high radionuclide purity and chemical purity at the same time, and can meet related pharmaceutical requirements.

The present application relates to enzymatic hydrolysate separation device technical field, propose a kind of multistage centrifugal device for enzymatic hydrolysate separation, including separation tank, the lower block for filtering insoluble is equipped in the separation tank, the multistage centrifugal mechanism for separating oil component in enzymatic hydrolysate is equipped in the separation tank and below lower block position.This application is forced by centrifugal force produced when rotating tube, rotating rod and centrifugal plate drive enzymatic hydrolysate rotation, oil in enzymatic hydrolysate is rapidly gathered in the lower part of enzymatic hydrolysate, and under the cooperation of impurity removal annular cavity, the purpose of separating oil is realized, compared with traditional separation mode, greatly reduce the separation time required, thereby improve the separation efficiency of device, in addition, under the action of primary purification annular cavity, purification hole and material guiding pipe, enzymatic hydrolysate in primary separation cylinder can be transferred to secondary separation cylinder for secondary separation, thereby improve the separation effect of enzymatic hydrolysate, conducive to the promotion of equipment.

The application discloses a foam multiple and 25% liquid separation time on-site detection temperature compensation method, S1: different kinds of foam extinguishing agents are sampled, and each foam extinguishing agent is configured into several foam mixtures with different temperatures according to a mixing ratio; S2: the foam mixtures with different temperatures in step S1 generate foam respectively, and the foam multiple, 25% liquid separation time and generated foam temperature are measured; S3: a first fitting equation of the generated foam temperature and the foam multiple ratio of different kinds of foam extinguishing agents is established respectively, and a second fitting equation of the generated foam temperature and the 25% liquid separation time ratio of different kinds of foam extinguishing agents is established; the on-site detected foam multiple and 25% liquid separation time are corrected through the first fitting equation and the second fitting equation respectively. The application can reduce the influence of the on-site environment temperature, obtain the foam multiple and 25% liquid separation time standard data of the foam temperature of 20 DEG C on site, and improve the accuracy and authority of the detection result.

Provided are a diamond composite body capable of shortening a separation time for separating a substrate and a diamond layer, the substrate, and a method for manufacturing a diamond, as well as a diamond obtained from the diamond composite body and a tool including the diamond. The diamond composite body includes a substrate including a diamond seed crystal and having grooves in a main surface, a diamond layer formed on the main surface of the substrate, and a non-diamond layer formed on a substrate side at a constant depth from an interface between the substrate and the diamond layer.

The utility model relates to the technical field of filtration, and discloses three-in-one reaction washing and filtering equipment. The three-in-one reaction washing and filtering equipment comprises a reaction container, the filter part is arranged in the reaction container and divides an inner cavity of the reaction container into a reaction cavity and a total filter cavity, the filter part is provided with a filter channel communicated with the reaction cavity and the total filter cavity, and the filter channel is arranged to only allow liquid to flow; the pressure control unit is arranged at the upper part of the reaction container to adjust the pressure in the reaction container; the material conveying unit is used for inputting or discharging materials into or out of the reaction container; according to the three-in-one reaction washing and filtering equipment disclosed by the utility model, a pressure applying filtering mode is adopted, so that the problems of long liquid-solid separation time and low separation efficiency of a sedimentation method are solved, and the production efficiency of a whole product production line is improved.

The application discloses a separation method, characteristic spectrum and construction method of five substances in Ibeimu. The separation method comprises the following steps: subjecting a test sample solution to high performance liquid chromatography-evaporative light scattering detector detection to separate the components to be detected; the components to be detected comprise peimisine, sipeimine, ibeimine A, sipeimine and sushabeimine; and the preparation method of the test sample solution comprises the following steps: extracting alkaloids from Ibeimu standard decoction or pieces by using an ammonia solution to obtain a mixed solution; and heating and refluxing the mixed solution and a mixed solvent. The separation method can effectively separate the substances simultaneously, and the separation time is relatively short. The application establishes a quality evaluation method for qualitatively evaluating the Ibeimu standard decoction, and the method is relatively systematic, simple, easy to implement, specific and good in repeatability. The characteristic spectrum of the pieces and the standard decoction has high similarity. The method can be used for quality control of the Ibeimu standard decoction, and provides basic data support for subsequent formula granules and other researches.

The application discloses a speed-restricted separation method of a solid rocket engine-boosted vehicle, which comprises the following steps: S1, determining a first maximum speed threshold Vmax1, a second maximum speed threshold Vmax2 and a latest separation time Tmax; S2, comparing a full-missile flight speed Vt0 at the end of engine operation with the first maximum speed threshold Vmax1, and separating the vehicle in time at the end of engine operation when Vt0Vmax1, entering step S3; S3, delaying the separation of the vehicle after the end of engine operation; the specific method of delaying the separation is as follows: if the full-missile flight time is less than Tmax, comparing a full-missile flight speed Vt at the current time with Vmax2, separating the vehicle when VtVmax2, and continuing the full-missile flight when Vt≥Vmax2; if the full-missile flight time is greater than or equal to Tmax, separating the vehicle. The application can judge the separation time according to the real-time flight speed, provide a suitable speed after the separation of the main stage, and ensure the flight control requirements and speed requirements of the main stage after the separation.

The present application relates to a kind of two-phase absorption liquid phase separation device, by installing multiple limit card strip on the inner wall of phase separation tank symmetrically, according to the requirement, flow channel plate is staggered and installed to the limit card strip inside the inner wall of phase separation tank, limit insert strip on flow channel plate is inserted into the limit slot on limit card strip, to fix flow channel plate, according to the phase separation characteristics of different two-phase absorption liquid, the number of flow channel plate can be increased or reduced, the longer the absorbent phase separation time, the more the number of flow channel plate is needed, the staggered flow channel plate forms curved flow channel, extends flow channel length, and reduces flow rate, so that absorbent can be fully phase separated before discharge;By installing absorbent flow distribution mechanism in the rear end of phase separation tank, and setting rotary disc outside phase separation tank, rotary disc is connected with rotating shaft, can be separated according to the phase separation ratio of absorbent, by the cooperation of transmission gear and rack, make upper extension plate and lower extension plate move, make absorbent up and down phase separation.

This invention discloses a method for determining the separation time between stages containing thrust reversers and springs. This method can accurately determine the separation time between the booster and the main stage, providing support for separation safety and a reference for the main stage engine ignition time. The method mainly includes three parts: spring reverser time calculation, initial separation time calculation, and complete separation time calculation. First, aerodynamic simulation is used to calculate the aerodynamic forces in the initial state of the spring reverser and the fully extended state of the spring, thereby obtaining the spring reverser time through variable acceleration motion calculation. Then, using the fully extended spring state as the initial time point, the time it takes for the main stage and booster to reach a 5mm gap is calculated as the initial separation time. Subsequently, through coupled computational fluid dynamics and rigid body dynamics simulation, the separation trajectory of the booster under aerodynamic forces is obtained, thus obtaining the time for complete booster separation. Finally, the total separation time including thrust reversers and springs is obtained by summing the three time components.

The invention discloses a foam multiple and 25% drainage time on-site detection temperature compensation method, which comprises the following steps: S1, sampling different types of foam extinguishing agents, and preparing each foam extinguishing agent into a plurality of foam mixed liquids with different temperatures according to a mixing ratio; s2, respectively generating foams by the plurality of foam mixed liquids at different temperatures in the step S1, and measuring the foam multiple, 25% drainage time and the temperature of the generated foams; s3, a first fitting equation of the ratio of the foam temperature generated by the different types of foam extinguishing agents to the foam multiple is established, and a second fitting equation of the ratio of the foam temperature generated by the different types of foam extinguishing agents to the 25% drainage time is established; the foam expansion and 25% drainage time detected on site are corrected through the first fitting equation and the second fitting equation respectively. According to the method, the influence of the field environment temperature can be reduced, the foam expansion at the foam temperature of 20 DEG C and 25% drainage time standard data can be obtained on site, and the accuracy and authority of a detection result are improved.

The invention belongs to the technical field of gas absorption and separation, and discloses a phase separation rate adjustable method-ethanol accelerant which comprises 5mol / L of monoethanolamine, 5mol / L of sulfolane and water as a solvent. The phase splitting speed is obviously increased; the phase splitting time is 32 minutes and 50 seconds before the absolute ethyl alcohol is not added, and the phase splitting time is 6 minutes and 9 seconds after the absolute ethyl alcohol with the volume fraction of 5 percent is added; the method is suitable for different temperatures and concentration ratios, energy loss is reduced, and the method has a good industrial application prospect.

The invention relates to a method for separating acetone in a tetramethylpiperidone reaction liquid, which adopts a double-tower continuous rectification system to separate acetone in the tetramethylpiperidone reaction liquid, and the double-tower continuous rectification system is used for treating the reaction liquid through two rectification towers in sequence. Separation is continuously carried out, separation efficiency is remarkably improved, separation time is shortened, and equipment size is reduced.

The invention provides a carrier rocket interstage cold separation time sequence optimization design method considering a safety gap. The carrier rocket interstage cold separation time sequence optimization design method comprises the steps that the optimization target of the interstage cold separation process is determined as the minimum separation total time; establishing a constraint condition of inter-stage separation, wherein the constraint condition comprises that an inter-stage unlocking moment is greater than or equal to a first-stage engine shutdown moment; in the separation process, the minimum gap between the upper-stage engine jet pipe and the interstage section is larger than or equal to zero; the relative displacement of the upper stage and the lower stage in the separation process reaches or exceeds the preset stage separation stroke requirement; and based on the optimization target and the constraint condition, determining an optimal inter-stage unlocking moment through iterative calculation. According to the method, the optimal inter-stage unlocking moment is determined on the basis of the optimization target and the constraint condition by determining the optimization target of the inter-stage cold separation process, so that the purpose of remarkably shortening the separation time on the premise of ensuring the separation safety is achieved.

The gas-liquid separation device comprises a separation box body, the outer surface of the separation box body is fixedly connected with a separation mechanism, the inner wall of the separation mechanism is fixedly connected with a detection mechanism, and the separation mechanism comprises a separation shell fixedly connected to the upper surface of the separation box body. The inner wall of the separation shell is fixedly connected with a fixing frame. The gas-liquid separation device facilitating the low-temperature evaporator belongs to the technical field of gas-liquid separation devices. According to the gas-liquid separation device convenient for the low-temperature evaporator, the centrifugal suction fan is started, negative pressure is generated during operation, the gas filtering speed is remarkably increased, a gas-liquid mixture rapidly passes through the flow equalizing plate, the flow guide plate and other multi-stage separation assemblies under the action of the negative pressure, liquid drops are separated at the position of the flow guide plate and the metal net through inertia, and fine impurities are further intercepted through the filter screen; compared with a traditional separation mode, the device shortens the separation time and improves the separation efficiency of gas and liquid.

The application discloses a plasma separation device, which comprises a shell, a cavity arranged in the shell, an opening arranged on the cavity, a sealing mechanism hinged at the opening, a support platform arranged in the cavity, a plurality of slidingly connected limiting pieces arranged on the support platform, a magnetic attraction fixing piece arranged in the cavity, one end of the magnetic attraction fixing piece being insertedly fixed with the sealing mechanism, the magnetic attraction fixing piece facing the plurality of limiting pieces respectively, a plurality of color sensors fixed on the bottoms of the corresponding limiting pieces respectively, a plurality of pushing components arranged on the support platform and arranged in one-to-one correspondence with the plurality of limiting pieces respectively, the driving end of the pushing component being detachably connected with the corresponding limiting piece, and a driving mechanism arranged in the cavity. Therefore, the separation time of different plasma can be reasonably controlled, the separation effect of the plasma is improved, and unnecessary sample loss is avoided.

The invention relates to the field of petroleum processing, and discloses an efficient spiral-flow type oil-gas-water three-phase separator which comprises a separation tank and further comprises a spiral-flow unit arranged in the separation tank and communicated with a feeding port in the separation tank; the control unit is arranged in the separation tank and is connected with a discharge pipe on the separation tank; the rotational flow unit comprises a rotational flow tank, a separation tank and a plurality of rotational flow nozzles, wherein the rotational flow tank is arranged in the separation tank and is fixed in the separation tank through a retainer; according to the invention, rapid separation is realized, compared with a traditional gravity settling separation mode, the separation time is shortened, the separation efficiency is improved, a relatively high separation effect can be realized in a relatively small equipment volume, and the occupied area and the cost of the equipment are reduced; the problems of water inclusion in an oil phase, oil mixing in a water phase and the like caused by liquid level fluctuation are avoided, the stability of separation quality is ensured, and the separation efficiency is further improved.

The application provides a simulation test method and device for water separation performance of machine oil after emulsification, and relates to the field of water separation performance simulation test. The method comprises the following steps: adjusting the reaction temperature of a reaction device; controlling a liquid storage device to deliver machine oil with a predetermined water content to the reaction device; controlling a measuring device to measure the separated water content corresponding to the separated water in the reaction device in real time to obtain a first separated water content, wherein the separated water content is the ratio of the mass of the separated water to the mass of the water in the machine oil with the predetermined water content; and determining the current reaction temperature as the minimum temperature of the engine when the machine oil with the predetermined water content is used under the condition that the reaction time of the reaction device is equal to the maximum water separation time of the engine and the first separated water content is equal to the separated water content threshold, wherein the maximum water separation time is the maximum time for the engine to separate water from the machine oil, thereby solving the problem that the engine is prone to wear due to the difficulty in determining the water separation performance of the engine after the emulsification of the machine oil in the prior art.

The application discloses a boost separation method considering speed constraint of unpowered flight section, comprising the following steps: S1, recording the time when the engine stops working as the earliest separation time tp0; S2, determining the latest separation time tp_max, wherein the tp_max is the latest time when the control system can control the aircraft to reach the target position according to the required speed and height; S3, obtaining the altitude-speed curve of the ideal trajectory as the ideal speed curve, and recording the ideal speed curve as the H-V curve; S4, determining the separation time of the aircraft according to the H-V curve in the actual flight process. The separation method provided by the application limits the speed of the separation time of the aircraft and the boost stage, provides a suitable initial speed for the unpowered flight section of the aircraft, and is simple, efficient and easy to implement.

The invention provides a method and a device for separating boron isotopes through membrane chromatography. The invention provides a method for separating boron isotopes by membrane chromatography, which comprises the following steps: by taking a composite membrane material as a stationary phase and a boron-containing solution as a mobile phase, directly enabling the boron-containing solution to flow through a composite membrane to enrich 10B in a membrane phase and enrich 11B in a liquid phase, wherein the composite membrane contains a compound capable of separating boron isotope functional groups. The invention provides a membrane chromatography technology which has the advantages of a membrane technology and a chromatography technology, on one hand, through structural modification and functionalization of membrane ligand pore channels and surfaces, selective adsorption separation of the membrane on different target objects can be achieved, separation factors are increased, and the abundant membrane pore channel structure can effectively reduce internal diffusion resistance and improve separation efficiency; on the other hand, by constructing a multi-stage membrane chromatographic separation system, chromatographic column separation factors can be effectively increased, the separation time can be shortened, and the cost can be reduced.

The invention discloses a method for detecting the content of tetrahydrofuran in soil, which comprises the following steps: S1, weighing the soil, placing the soil in a purging bottle, adding water and a stirrer, adding an internal standard sample, and preparing for detection; and S2, carrying out detection by adopting a gas chromatograph-mass spectrometer. According to the method, the tetrahydrofuran in the soil is detected by purging and trapping, particularly the low-content tetrahydrofuran in the soil is detected, and the method has relatively high sensitivity and low detection limit. The sample inlet temperature of 250 DEG C is adopted, so that the separation time in a chromatographic column is prolonged, the detection sensitivity of tetrahydrofuran in soil can be improved, and the detection accuracy is improved. By adopting the chromatographic column with the specification of 20m * 0.18 mm * 1mu m, the accuracy of tetrahydrofuran detection can be improved, and the interference of impurities is reduced. The method has a linear relation within the concentration range of 100-500 [mu] g / L, the relative standard deviation is low, and the adding standard recovery rate is high.

The invention discloses a precise regulation and control method and system for a separation process of negentropy small molecule water preparation, and relates to the technical field of water treatment. The method comprises the following steps: performing turbidity detection and judgment on purified small molecule water, determining an initial negentropy separation parameter based on historical data, performing separation operation, calculating a negentropy separation deviation value, and generating a corresponding regulation and control signal in combination with a comparison result of a separation negentropy value and a target negentropy value; and feedback strategies such as temperature and pressure parameter adjustment, separation time increase and decrease or separation stop are adopted according to different regulation and control signals. The system comprises a data acquisition module, a turbidity judgment module, a separation execution module, a parameter calculation module, a signal generation module and a precise regulation and control module, and is used for executing the method. According to the method, the technical problems of large negentropy value fluctuation and overhigh energy consumption in the negentropy small molecule water preparation process are solved, the optimal balance between the separation effect and the energy consumption cost is realized, and the technical scheme can be clearly implemented.

The application provides a liquid scintillation spectrometer Kr-85 detection parameter control adjustment method and system, relates to the technical field of parameter control, and comprises the following steps: collecting the gas component data of the gas input into a primary enrichment unit after pre-impurity removal, inputting a pre-trained dynamic parameter controller, outputting obtained adsorption control parameters, and performing adsorption of the gas by using the adsorption control parameters; collecting the impurity residual amount of the gas in a separation process in real time by using a nitrogen oxygen sensor, and dynamically adjusting and controlling a preset separation time; collecting the Kr residual amount in the primary enrichment unit in an analysis process, and dynamically adjusting and controlling analysis control parameters; collecting the gas component data of the gas input into a secondary enrichment unit, and dynamically adjusting and controlling the adsorption control parameters, the separation time and the analysis control parameters; acquiring the Xe / Kr concentration ratio of the gas input into a chromatographic separation unit through the secondary enrichment unit, and dynamically adjusting and controlling a TCD chromatographic column temperature. The technical problem of low detection accuracy of the liquid scintillation spectrometer Kr-85 in the prior art is solved.

The invention provides a simulation test method and device for water separation performance after engine oil emulsification, and relates to the field of water separation performance simulation tests.The method comprises the steps that the reaction temperature of a reaction device is adjusted; controlling the liquid storage device to convey the engine oil with the preset water content to the reaction device; the measuring device is controlled to measure the separated water content corresponding to the water separated from the reaction device in real time, the first separated water content is obtained, and the separated water content is the ratio of the mass of the separated water to the mass of the water in the engine oil with the preset water content; under the condition that the reaction duration of the reaction device is equal to the maximum water separation duration of the engine and the first separated water content is equal to a separated water content threshold value, the current reaction temperature is determined as the lowest temperature of the engine when the engine oil with the preset water content is used, and the maximum water separation duration is the maximum duration of water separation of the engine oil by the engine; the problem that in the prior art, the water separation performance of the engine after engine oil emulsification is difficult to determine, and consequently engine abrasion is likely to occur is solved.

This invention discloses an apparatus and method for preparing a high specific activity Tb-161 solution, belonging to the field of radioisotope preparation technology. It includes: a shielded box and a target material processing system, a separation system, a radioactivity detection system, and a control system housed within the shielded box. The separation system is used to adsorb the target material solution, elute it with an organic carboxylic acid eluent, and process the obtained Tb-161-containing eluent to obtain a Tb-161-containing solution. The apparatus for preparing a high specific activity Tb-161 solution provided by this invention separates Tb-161 from irradiated Gd-160-enriched target material using ion chromatography, significantly improving the yield and specific activity of terbium-161 and simplifying the separation process. The constant column temperature during separation greatly reduces waste liquid volume, shortens separation time, and avoids the problem of insufficient terbium-161 specific activity caused by gadolinium tailing.

The utility model discloses a separating device for a product and a jig, which comprises a separating mechanism and a connecting mechanism, the separating mechanism comprises a first driving piece, a bearing platform, a first fixing assembly and a second fixing assembly, the first fixing assembly is used for fixing the product, and the second fixing assembly is used for fixing a rubber plug. A first separating assembly and a second separating assembly are arranged on the bearing platform, the first separating assembly is used for unlocking and separating the product from the jig body, and the second separating assembly is used for unlocking and separating the rubber plug from the jig body; the connection mechanism comprises a connection positioning assembly, and the connection positioning assembly is used for fixing the rubber plug to a product; when the separating device for the product and the jig works, the first driving piece drives the bearing platform to move to the preset position, the connection positioning assembly fixes a rubber plug to the product, the first separating assembly and the second separating assembly work, unlocking and separating of the product and the jig are achieved, the design is ingenious, manual operation is omitted, the separating time is greatly saved, and the working efficiency is improved. The separation efficiency is high.

The invention relates to a liquid chemical preparation production device, and belongs to the field of production devices, the liquid chemical preparation production device comprises a separation tank and a reboiler, the separation tank is communicated with the reboiler through a feeding pipe, an isolating membrane is arranged in the separation tank, the isolating membrane and the feeding pipe are oppositely arranged, and the reboiler is communicated with the separation tank. And the separation tank is provided with a regulation and control assembly for regulating the distance between the isolating membrane and the inner wall of the separation tank. Materials entering the separating tank are isolated through the isolating membrane, so that the materials are concentrated between the isolating membrane and the inner wall of the separating tank, heavy-component materials can be conveniently deposited to the bottom of the separating tank along the inner wall of the separating tank, the separating time of light-component materials and the heavy-component materials is shortened, and therefore the overall production efficiency of the production device is improved.

The invention relates to a rapid solid-liquid separation process for colloidal turbid liquid. The rapid solid-liquid separation process comprises the following steps: S1, flocculation pretreatment; s2, micro-nano bubble synergistic air flotation; s3, high-frequency microwave vibration strengthening; and S4, filtering to obtain a solid product and a filtered liquid. After separation by the scheme of the invention, the turbidity of the final upper-layer clarified liquid is reduced to 10-100NTU, the solid recovery rate is greater than or equal to 95%, the industrial-grade raw material standard is met, and the total separation time is 10-30 minutes. The colloid concentration in the separated liquid product is reduced to 0.02 g / L or below, and the removal rate of particles with the particle size larger than 1 micron exceeds 98%; the turbidity is reduced from more than 500 NTU to 10-100 NTU, and the solid content is reduced from more than 5% to less than 0.1%; the free water filtering rate reaches 92%, efficient separation of particles and water is achieved, and key parameters all meet deep treatment requirements.

The utility model relates to the technical field of yoghurt processing devices, and discloses yoghurt whey separation equipment which comprises a filtering barrel, a pressurizing device, a separation device, a whey receiving device and a weighing device. When the cold-extracted yoghourt is prepared, the yoghourt is put into the filter barrel, whey in the yoghourt flows into the separation device from the filter barrel after being pressurized by the pressurizing device, and then enters the whey receiving device, so that the separation of the whey is realized, manual operation is replaced, the labor intensity of workers is reduced, the separation time is shortened, and the defects of quality risk and the like caused by manual separation are eliminated; meanwhile, the mass of whey in the whey receiving device is weighed through the weighing device, the whey separation proportion can be accurately controlled, whey separation and extraction can be efficiently and accurately achieved, the separation efficiency is greatly improved, and the large-scale production requirement of cold extraction yogurt is fully met.