136results about How to "Precise control of flow rate" patented technology

The invention relates to a leaching device used in vertical transfer of pollutants in soil. The leaching device comprises a spray nozzle, a water flow meter, a leaching column for holding an experimental earth pillar and a percolate accommodating container, wherein, the leaching column is internally provided with at least two filter layers capable of filtering leaching liquid, a filter layer structure is respectively arranged on the upper and lower ends of the experimental earth pillar, and each filter layer is provided with a filter screen layer, a filter bulb layer and a filter paper layer; and in addition, the height of the leaching column body is 90cm-150cm, and the inner diameter of the cross section of the column body is 5cm-15cm. The leaching device has the advantages that on the basis of the large axial size of the leaching column, vertical transfer of the pollutants in the profile of the deeper soil can be simulated; by setting the water flow meter, the flow velocity and flow rate of injection water can be accurately controlled; by setting the upper filter layer, the injection water can be uniformly sprayed; and by setting the lower filter layer, the filter effect can be ensured and percolate can be timely and effectively discharged.

The invention discloses a high-precision micro-injection pump and application of the high-precision micro-injection pump and relates to the technical field of medical instruments. The high-precision micro-injection pump solves the problems that an existing micro-injection pump is poor in adaptability and the stability is poor when syringes are clamped. The high-precision micro-injection pump comprises a shell, a display input module, a stepping motor pushing mechanism and a master control module and is characterized in that the shell is provided with a syringe tube handle clamping groove and a syringe tube bracket used for supporting a syringe tube in an attached mode, the shell is further provided with an elastic clamping mechanism, and the elastic clamping mechanism is matched with the syringe tube bracket and used for clamping and fixing the syringe tube; the elastic clamping mechanism comprises a first L-shaped support and a second L-shaped support which are arranged side by side; a displacement sensor for detecting the distance between the first L-shaped support and the second L-shaped support is arranged between the first L-shaped support and the second L-shaped support. According to the specifications of syringes, different specifications of syringe tube brackets, first clamping pieces and second clamping pieces are selected and matched, the sectional area of the syringe tube is calculated by the displacement sensor according to the distance between two different containing marks, the high-precision micro-injection pump is suitable for various specifications of syringes, the stability is good when the syringes are clamped and fixed, and the flow speed of fed medicine of the syringes can be accurately controlled.

The invention discloses an online total organic carbon water quality analyzer and an online total organic carbon water quality analyzing method. The analyzer comprises a sample introduction system, a detecting system, a control system and a cleaning system, wherein a pipeline fitted between the sample introduction system and the detecting system is connected in parallel with a measured water system, an original water sample system and an oxidized water sample system and provided with a switching device; the measured water system is respectively and normally communicated and connected with the sample introduction system and the detecting system; the cleaning system is arranged in front of the detecting system and communicated with the detecting system; and the control system is electrically connected with the sample introduction system, the detecting system, the measured water system, the original water sample system and the oxidized water sample system and used for respectively controlling the sample introduction system, the detecting system, the measured water system, the original water sample system and the oxidized water sample system to work. The analyzing method comprises the following steps of: A. establishing four sequentially-connected systems; B. establishing the control system and controlling the actions of all the system in the step A; C. preparing for detection; and D. detecting. The online total organic carbon water quality analyzer is capable of realizing online detection, high in detection precision, low in detection limit and simple to operate.

The invention relates to a method for preparing epoxypropane in a microchannel reactor. The method mainly solves the problems of existence of explosive danger, low conversion rate and low selectivity in the prior art. The technical scheme is as follows: by adopting the method for preparing epoxypropane in a microchannel reactor, gas-phase propylene contacts hydrogen peroxide generated by hydrogen and oxygen in-situ compounding in the microchannel reactor to directly generate the epoxypropane under the action of a catalyst; and propylene and oxygen directly react under the action of a catalyst to generate the epoxypropane, the epoxypropane is collected at the lower reach of the microchannels in the liquid-phase form, and the unreacted gas cyclically enters the microchannel reactor inlet or is evacuated after being diluted. The microchannel reactor comprises at least one microchannel, wherein the sectional dimension of each microchannel is 1 micrometer-1 centimeter, and the sectional dimensions of the microchannel in positions of different lengths are identical or different; and the catalyst is positioned in at least one part of the axial length of the microchannel. The technical scheme well solves the problems, and can be used for preparing epoxypropane.

The invention relates to a paraxial powder-feeding working head for laser powder processing. The paraxial powder-feeding working head comprises a powder-gas separator, a powder-gas input chamber, a fast-plug connector, a powder collecting chamber, a first powder conveying tube, a processing gas input chamber, a processing gas collecting piece, a processing gas input joint, a fixed frame, a second powder conveying tube, a third powder conveying tube and a powder spray nozzle, wherein the processing gas collecting piece is a gradual-contraction funnel shaped component; a throttle valve is used for outputting a powder-carrying gas input by a powder feeder; a stainless steel wire net is arranged at the front end of the throttle valve. According to the paraxial powder-feeding working head disclosed by the invention, separation of metal powder and conveyed powder-carrying gas is realized, so that on one hand, outflow rate of the metal powder from the spray nozzle is lowered to ensure stability of powder conveying amount, and therefore, stable powder output amount requirements in laser powder processing processes of laser cladding, and the like are satisfied; on the other hand, a gas different from the powder-carrying gas is input from the processing gas input joint to achieve a purpose of protecting a processing piece; meanwhile, powder spraying speed of the powder feeding spray nozzle can be adjusted in an assisted manner, so that processing effect is controlled better.

The invention discloses a gas-liquid-solid three-phase abrasive flow plane polishing system based on a cavitation effect, comprising a two-degree-of-freedom moving device, a gas-liquid-solid mixing device, a rotary driving device, a cavitation polishing tool, a workpiece clamping device, a workpiece processing pool, an abrasive flow circulation device, a high-pressure gas injection device and a console, wherein the cavitation polishing tool comprises an outer constraint block and an inner constraint block which jointly form an annular narrow-slit flow channel with a large inlet and a small outlet; and the annular narrow-slit flow channel communicates with a through hole in a rotary spindle through an internal flow channel in an outer constraint body. The gas-liquid-solid three-phase abrasive flow plane polishing system based on a cavitation effect uses the principle of structural cavitation to set the annular narrow-slit flow channel on a cavitation polishing tool, and realizes the structural cavitation of the liquid by using a flow channel design with a larger inlet and a smaller outlet, and realizes the high-efficient material removal rate of the workpiece surface; and the liquidsecondary cavitation is realized by the design of a round corner on the cavitation polishing tool, so that the efficiency of fluid polishing is improved.

The invention provides a grain drying method based on Kalman filtering.According to the method, the grain flow speed is accurately controlled by real-time detection of the grain moisture content and environment temperature parameters, measurement parameters are corrected in real time, Kalman filtering is adopted for conducting prediction-correction on measurement results of a near-infrared grain analyzer, a BP neural network is adopted for training, the influences of environmental factors on the detection of the grain moisture content are weakened, and accurate control over the drying period and the drying results is achieved.

The invention discloses a valve lift control device of a fully variable hydraulic valve mechanism and an internal combustion engine, and belongs to the field of air distribution mechanisms and fuel supply systems of internal combustion engines. When a plunger of the valve lift control device ascends to the position where a circumferential annular groove and an oil leakage hole communicate, hydraulic oil in a plunger oil cavity and a piston oil cavity flows into an energy storage cavity through an axial straight groove, the circumferential annular groove, the oil leakage hole and a first low-pressure oil duct, and the pressure and amount of oil in the plunger oil cavity and the piston oil cavity are reduced, so that the maximum lift of a valve is reduced, and the valve falls back in advance. By controlling the rotation angle of the plunger, changing duration of communication of the circumferential annular groove and the oil leakage hole, adjusting the minimum effective circulation area formed by the circumferential annular groove and the oil leakage hole, and controlling the amount of hydraulic oil flowing out of the oil leakage hole, the maximum lift and descending time of the air valve are changed. The valve lift control device is simple in structure, reliable in operation, low in cost and suitable for internal combustion engines with cam shafts on the upper portions, lower portions and middles.

The invention relates to the technical field of liquid metal, in particular to a liquid metal droplet forming device. The device comprises a liquid metal droplet generator and a first micro-injectionpump, wherein the liquid metal droplet generator comprises a generation block, a first pipeline for accommodating liquid metal and a second pipeline for accommodating a continuous phase; a through hole is formed in the generation block, a first end of the first pipeline and a first end of the second pipeline extend into the through hole from two ends of the through hole respectively, and the firstend of the first pipeline and the first end of the second pipeline are coaxial and arranged oppositely; an output end of the first micro-injection pump is connected with a second end of the first pipeline, so that liquid metal is input into the first pipeline and pushed into the second pipeline from the first end of the second pipeline. The device can precisely control the size and distribution of liquid metal droplets, and the formed liquid metal droplets have uniform sizes.

The invention relates to a hydraulic damper without idle stroke, which comprises an enclosed cylinder body (4). A piston (7) which can slide in the cylinder body and a piston rod (2) which is connected with the piston are arranged in the inner chamber of the cylinder body (4). The invention is characterized in that the inner chamber of the cylinder body (4) is further provided with a floating-ring (8) which can slide in the cylinder body, the inner chamber of the cylinder body (4) is separated into a first working chamber (A), a second working chamber (B), and a third working chamber (C) by the piston (7) and the floating-ring (8), the piston rod (2) is penetrated through the first working chamber (A) and is conducted hermetically from one end of the cylinder body (4), the other end of the cylinder body (4) is provided with a plug (9), the first working chamber (A) and the second working chamber (B) are separated by the piston and are fed with hydraulic liquid, and the third working chamber (C) is positioned between the floating-ring (8) and the plug (9) and is fed with air with pressure intensity. The invention has the advantages of no idle stroke, long service life, excellent radiation, low costs of material, and controlled amplitude precision and the like.

The invention relates to a method for preparing active carbon by using a coke reactivity testing device. The method comprises the following steps: adding coke powder into a potassium hydroxide solution by using the coke reactivity testing device, grinding until the grain size is 0.07-0.08mm, adding coal tar and water, and heating a crucible at a temperature raising rate of 8-12 DEG C/minute; when the temperature reaches 400-410 DEG C, introducing nitrogen, wherein the flow rate of nitrogen is 1.0-1.5L/min; when the temperature reaches 850-880 DEG C, insulating for 40-60 minutes; obtaining coarse active carbon; and crushing, washing and drying the coarse active carbon to obtain active carbon. The method for preparing active carbon provided by the invention is carried out in the coke reactivity testing device which is good in tightness. The coke reactivity testing device is capable of precisely controlling the temperature raising rate and the reaction temperature, preventing the active carbon from being oxidized in the preparation process, improving the specific surface area of the active carbon, strictly controlling the change of introducing nitrogen and preventing the coke powder from being oxidized, and moreover, the rate of an activating reaction is accelerated by virtue of the flow rate of nitrogen.

The invention relates to obtaining of reaction heat during a tubular reaction, in particular to a testing method and device for obtaining calorimetry of a gas-gas, gas-liquid, gas-solid, liquid-liquidand liquid-solid solid-phase tubular reaction through a constant-temperature heat flow mode. According to the device, through the constant-temperature heat flow mode, calorimetry testing of the gas-gas, gas-liquid, gas-solid, liquid-liquid and liquid-solid solid-phase tubular reaction is conducted, and real-time on-line measurement and data analysis can be accurately implemented. The device comprises a reactor system, a temperature control system, a pressure control system, a gas replacement system, a gas feeding control system, a liquid feeding control system, a calibration system, a sampling system, a material collecting system, a gas-liquid separating system, a central control system and a data processing system, so that calorimetry testing of the heat release and heat absorbing tubular reaction is realized.

The invention relates to multi-dripper UV photocuring water-based capsule production equipment; the capsule production equipment comprises a feeding system A, a forming system B, a circulating systemC and a control system D; by using the multi-dripper UV photocuring water-based capsule production equipment disclosed by the invention, the consistency of the capsule materials is ensured from the source; meanwhile, equipment parts can be utilized to the maximum extent, the production efficiency is improved, the production cost is lowered, and the equipment is rapid, efficient, energy-saving andenvironment-friendly, and does not need to be subjected to excessive treatment in the later period, so that subsequent processing and transportation and storage can be conveniently carried out, and the UV light-cured water-based capsule capable of effectively storing contents for a long time can be obtained.

The invention relates to a capillary electrophoresis-chemiluminescence detection interface device and a preparation method thereof. The interface device comprises organic glass, a reaction capillary and an isolation capillary, a transverse through channel and a longitudinal luminescence detecting window are arranged in the middle of the organic glass, the reaction capillary is arranged in the transverse through channel, at least two positioning gaskets are arranged between the outer wall of the reaction capillary and the inner wall of the transverse through channel, one end of the isolation capillary is inserted into a feeding end of the reaction capillary while the other end of the isolation capillary penetrates through a rubber plug which is mounted on a corresponding end port of the transverse through channel, and a luminescence reagent channel and an electrode mounting channel are further arranged on two radial sides of the isolation capillary. The capillary electrophoresis-chemiluminescence detection interface device is low in preparation cost, an interface is small and exquisite, and the device is easy and convenient to operate, can effectively solve the problems of lowering of isolation efficiency, sensitivity and stability and the like due to introduction of CL (chemiluminescence) reagent, has high CE (capillary electrophoresis) isolation efficiency and high CL detection sensitivity and can be used for analysis of biological samples, food and environmental samples.

The invention discloses a fire coal combustion source discharged carbonyl compound sampling device. The sampling device comprises an air inlet part, a first-grade dilution system, a second-grade dilution system, a staying chamber and a sampling part. A combustion temperature can influence carbonyl compound gas-particle distribution and thus in order to simulate cooling, dilution and coagulation of flue gas discharged into air, the staying chamber is built and used after flue gas dilution. The sampling part adopts a self-made sampling tube coated with a pentafluorophenyl hydrazine (PFPH) Tenax-TA adsorbent to acquire a sample and utilizes a steam coating process and an introduction port thermal desorption analysis method so that solvent-caused influence on a detection result is avoided. The device is simple and easy, utilizes a dilution system to adjust a dilution ratio and is suitable for acquisition of other high-flue gas concentration gas substances.

The invention provides a pleural effusion drainage device which comprises a puncture cannula, a puncture needle, a drainage tube set, a first connection part and a drainage bottle. The drainage tube set comprises a first drainage tube and a second drainage tube, and one end of the puncture cannula is provided with a first blocking body. The puncture needle is provided with a second blocking body and a puncture handle, and the second blocking body on the puncture needle is matched with the first blocking body on the puncture cannula, so the puncture cannula can be fixed to the puncture needle, and the puncture handle is convenient to operate during an operation. The puncture cannula is arranged at the end, far away from the puncture handle, of the puncture needle in a sleeved mode, one end of each drainage tube penetrates through the first blocking body and is connected to the puncture cannula, and the other end of each drainage tube is connected with the first connection part and the drainage bottle in sequence. Hydrops and pneumatosis in a pleural cavity of a human body are discharged through the first connection part, the hydrops and pneumatosis which are discharged out of the body are collected in the drainage bottle through the drainage tubes, testing, metering and processing are facilitated, the puncture cannula is easy to fix after puncture, operation is easy, trauma is small, flow speed can be adjusted, pain of patient can be relieved, and safety performance is good.

The invention relates to a shallow sea well drilling high-yield gas well production tubular column vibration deformation experimental device and method. The device comprises an air compressor, a buffer tank, a pressure regulating valve, a splitter plate, a pressure sensor, a guide tube, a gas collector, a computer, a fixing device, a cable, a fixing plate, a spherical radial air inlet head, a gaspressurization chamber, a rock chamber, a rubber layer, a one-way valve, a gas storage bottle and an air pressure valve. The air flow generated by the air compressor enters the gas pressurization chamber after being regulated by the buffer tank and the pressure regulating valve through the one-way valve, and the rock chamber is formed in the gas pressurization chamber. The air compressor, the buffer tank, the pressure regulating valve, the one-way valve, the gas storage bottle and the gas pressurization chamber are combined to adjust the same air pressure with gas collected under the actual situation, and then data of the pressure sensor that the air pressure vibrates when passing the guide tube so that the guide tube deforms is collected on the computer. The shallow sea well drilling high-yield gas well production tubular column vibration deformation experimental device and method have the advantages that the device is safe and reliable, the operation is simple, measurement data is accurate, the operation is simple, and a gas production working state of a tubular column under the actual situation is reduced highly.