50results about How to "Rapid response" patented technology

The invention discloses a method for preparing a single-layer tungsten diselenide nanoband based on a space confinement strategy. By changing the flow and the growth time of hydrogen, effective control on the width and the thickness of a nanoband can be realized. The method comprises the following steps: uniformly spraying tungsten trioxide powder to one substrate, then covering the substrate by the other substrate, and forming micro reaction space which is of a 'sandwich'-like structure. Growth of a tungsten diselenide nanoband is carried out by utilizing a constant-pressure chemical vapor deposition method; physicochemical characteristics of a one-dimensional transition metal chalcogenide strongly depend on suspension key types on the edge of the one-dimensional transition metal chalcogenide, metallic properties are displayed by an ultranarrow band, and conversion from the metallic properties to semiconductor properties can be displayed from the edge to the center of a wider band; the tungsten diselenide nanoband is widely applied to micro-nano photoelectric devices due to the special property; industrial production of the tungsten diselenide nanoband can be realized through an experimental method of the invention.

The utility model discloses a kind of rice powder microwave heating curing device and rice powder machine with the device, the curing device includes extruding component, it includes extruding cylinder, further include microwave heating assembly, microwave heating assembly is arranged on the outer wall of extruding cylinder.Microwave heating assembly includes magnetron;Extruding component includes machine cylinder component and extruding screw rod, machine cylinder component includes inner cylinder and extruding cylinder;The sidewall of the extruding cylinder is equipped with multiple microwave guide inlets;Inner cylinder is arranged in the extruding cylinder, and the feed inlet of inner cylinder is communicated with the feed pipe;Extruding screw rod is arranged in the inner cavity of the inner cylinder;Each guide inlet on extruding cylinder is equipped with a microwave heating assembly, and guide inlet is fixedly connected with the magnetron.This rice powder microwave heating curing device directly heats rice powder by microwave, is easy to control heating temperature, energy saving and environmental protection, can solve the problem that material is unevenly heated, heating time is long, energy consumption is big in rice powder heating curing process.

This invention discloses a hydraulic piston for an air booster pump, relating to the technical field of hydraulic pistons for air booster pumps. It includes a push rod, one end of which has a positioning insert that can pass through a brake piston, and the other end is a connecting end that connects to an air chamber piston. A sealing gasket is provided between the brake piston and the push rod for sealing connection. The diameter of the free end of the sealing gasket is smaller than the diameter of the contact surface of the push rod. This application eliminates the push rod seat connecting the brake piston and the push rod in conventional air booster pumps, ensuring braking sensitivity and thus increasing safety. This application achieves rapid and sensitive response by directly connecting the brake piston and the push rod, improving braking safety and saving braking reaction time.

The utility model discloses a general vehicle full -color night -vision auxiliary driving system, including multi -objective camera, individual helmet, car machine big screen and panoramic video processor, multi -objective camera all with panoramic video processor electricity is connected with individual helmet, car machine big screen, the multi -objective camera is used for gathering the image of vehicle surrounding environment, individual helmet is provided with head -mounted display, and the head -mounted display of individual helmet is used to present the image of vehicle surrounding environment after the processing of panoramic video processor, car machine big screen is used for presenting the image of vehicle surrounding environment after the processing of panoramic video processor on the vehicle. The utility model solves the problem that the imaging color of traditional vehicle night -vision auxiliary equipment is single, the detail is not clear, cannot provide panoramic visual information, is difficult to effectively integrate with vehicle system, helps the driver to be more accurate in judging the road condition under the night and complex environment, and improves driving safety and convenience.

This utility model belongs to the field of liquid transportation technology, and specifically relates to a quantitative liquid transportation device. It includes a cavity, a driving fluid circulation mechanism, pneumatic valve I, pneumatic valve II, a storage bottle, a nozzle, and a pneumatic valve control module. The cavity is divided into a left cavity and a right cavity by a diaphragm. The left cavity is filled with a delivery fluid, and the right cavity is filled with a driving fluid. The right cavity is connected to the driving fluid circulation mechanism, which changes the volume of the right cavity by increasing or decreasing the amount of driving fluid, thus changing the volume of the left cavity accordingly. The nozzle is connected to the left cavity via an outlet pipe and pneumatic valve I, and is used to quantitatively deliver the delivery fluid. The storage bottle is connected to the left cavity via an inlet pipe and pneumatic valve II. Both pneumatic valves I and II are connected to the pneumatic valve control module, which controls the on / off state of pneumatic valves I and II. This utility model has a simple structure, small size, fast response, precise control, and good fatigue resistance.

The bedside monitoring room alarm bracelet comprises a monitor and a bracelet body, a bracelet watchband is connected to the bracelet body, a wireless transmission module is installed on the monitor and is used for wirelessly transmitting monitoring information on the monitor, a processor module, a display module, an alarm module and a power module are installed on the bracelet body, the wireless transmission module is electrically connected with a wireless receiving module through wireless connection, the monitoring information collected by the monitor and received by the wireless receiving module is collected and processed by the processor module, alarm information is transmitted to the display module on the bracelet body, and the processor module simultaneously alarms and reminds medical staff wearing the bracelet through the alarm module, so that the medical staff can timely understand the condition of the patient, the bracelet is muted after alarming, the medical staff can know which patient under their jurisdiction alarms first, the alarm content and make a quick response.

The application belongs to the technical field of polyurethane grouting materials, and discloses a high polymer grouting material capable of being rapidly cured in a low-temperature environment, which is formed by mixing A component and B component, and the content of each component is as follows in terms of weight fraction: A component: 100 parts of polymethylene polyphenyl polyisocyanate; B component: 35 parts of polyether polyol A, 15 parts of polyester polyol B, 5-15 parts of Mannich base, 10 parts of flame retardant, 1.5 parts of foaming catalyst, 0.5 parts of gel catalyst, 0.5 parts of surfactant, 5 parts of physical foaming agent, 1.0 parts of chemical foaming agent and 5 parts of plasticizer. The Mannich base curing agent is added to the B component during preparation of the two-component polyurethane grouting material, and is uniformly mixed with other materials, so that the high polymer grouting material can be rapidly cured in a low-temperature environment.

This invention provides a method and device for anti-pinch control of electric seats. The method includes real-time acquisition of current, speed, and physical angle during motor operation; when the current motor current exceeds a dynamic current threshold or the transient collision energy exceeds a collision energy threshold, and the current speed is less than a expected reference speed, the motor is controlled to stop or reverse. The dynamic current threshold is determined comprehensively based on a preset angle reference ammeter, load mass compensation, ambient temperature compensation, and a mechanical wear self-learning factor updated with the number of opening and closing cycles; the transient collision energy is calculated only when the transient current change rate exceeds a dynamic slope threshold, at which point an integral observation window is activated. The electric seat anti-pinch control method and device provided by this invention achieve anti-pinch functionality during the operation of the electric seat.

The application discloses a kind of high adhesion hydrogel for electroencephalogram test and its preparation method and application, belong to biomedical engineering technical field.The hydrogel includes the following components crosslinked product: anionic monomer, cationic monomer, monomer and mutual penetration agent;The anionic monomer is any one of malic acid, gluconic acid, citric acid and lactic acid, cationic monomer is betaine or acetyl L-carnitine, monomer is N, N-dimethyl acrylamide, acrylic acid, sodium acrylate, 4-acryloyl morpholine or sodium acrylamidomethyl propane sulfonate, mutual penetration agent is sodium chloride aqueous solution or sodium chloride water-retaining agent solution.Preparation, cationic monomer is mixed and dissolved, vacuum drying, adding photo initiator mixing, then mutual penetration agent is added, and it is obtained by ultraviolet light crosslinking.The hydrogel of the application has high adhesion (adhesion strength reaches 203.22 kPa), high ion mobility and excellent biocompatibility, and the signal gain in EEG and ECG test reaches 2-3 times of traditional conductive paste, which can be widely used in medical conductive paste field.

The application provides proline dehydrogenase, genes and mutants and applications thereof. The enzyme is derived from Pseudomonas xantholysinigenes and is recombinantly expressed in Escherichia coli. The target gene is codon-optimized when constructing a plasmid. The optimized DNA sequence is shown in SEQ ID NO. 2. The proline dehydrogenase is subjected to mutation modification. The enzyme and the mutants thereof can be used for efficiently catalyzing L-proline degradation to complete biological resolution of DL-proline, and high-purity D-proline is obtained. The application has great economic value in the field of green production of D-proline.

This invention discloses a device for detecting and clearing ice and snow debris from power lines, comprising five parts: a crawling mechanism, an obstacle-crossing and clearing mechanism, an eddy current heating device, an autonomous power-collecting device, and a drone docking and flight device. The autonomous power-collecting device includes an electromagnetic power-collecting device and a pantograph contact power-collecting device. The crawling device and the eddy current heating device are located inside an openable structure, while the outside of the openable structure is connected to the electromagnetic power-collecting device and the obstacle-crossing and clearing mechanism. Drone docking and flight devices are located on both sides of the crawling device, with the pantograph contact power-collecting device placed on top of the drone docking and flight devices. A main control unit is located between the crawling device and the electromagnetic power-collecting device. This invention solves the problem that traditional mechanical clearing methods easily damage power lines and accelerate wear. Simultaneously, this invention also addresses the safety hazards faced by existing clearing equipment and personnel, as well as the problem of short single-operation time due to battery performance limitations.

The disclosure provides a low dropout linear regulator circuit and a memory, the circuit comprising: a first transistor, a second transistor and a feedback control circuit; the gate dielectric layer thickness of the first transistor is less than a preset threshold; the first end of the first transistor and the second end of the second transistor are connected to receive a power supply voltage; the second end of the first transistor and the first end of the second transistor are connected to output a target voltage; the control end of the second transistor receives a power-on control signal, and the second transistor is used to output the target voltage during the power-on process; the feedback control circuit is connected with the control end of the first transistor, the feedback control circuit is used to receive the power-on control signal, control the first transistor to be disconnected during the power-on process, and control the first transistor to output the target voltage after the power-on is completed; wherein the power-on control signal is in an enabled state during the power-on process, and is in a disabled state during the remaining period. The disclosure can reduce the circuit area, avoid overvoltage and simplify the timing.

This invention provides a rapid colorimetric reagent for the detection of manganese and iron ions. The reagent consists of carbon dots, a 3,3′,5,5′-tetramethylbenzidine solution, and a phosphate buffer solution. The reagent itself is a brown, transparent solution. When manganese ions are added to the 3,3′,5,5′-tetramethylbenzidine solution and phosphate buffer solution, it turns blue (visible to the naked eye) upon irradiation with a 365 nm UV lamp; upon contact with iron ions in the 3,3′,5,5′-tetramethylbenzidine solution, it turns dark green (visible to the naked eye). This reagent exhibits an extremely low detection limit and good selectivity. The detection process does not require complex analytical equipment, enabling rapid trace detection of manganese and iron ions. The reagent is simple to prepare, overcoming the shortcomings of cumbersome and expensive synthesis of manganese and iron ion detection probe molecules, and providing effective technical support for trace detection in food safety.

A rack strap guide rail guide claw and tensioning mechanism of an automatic strap tool capable of passing through two holes, characterized in that: comprising: a rack, a strap guide rail, a guide claw mechanism, a tensioning mechanism; the rack is provided with a U-shaped groove for guiding the strap, and is also provided with a pit for positioning the head of the strap; the strap guide rail is installed close to the rack; the strap guide rail has a square-shaped guide channel matching the shape of the strap head; the square-shaped guide channel of the strap guide rail is in communication with one end of the U-shaped groove in the rack; the guide claw mechanism comprises at least two guide claws, at least one or each of the at least two guide claws has a U-shaped groove; the guide claw mechanism makes a translational motion or a swing around a fixed shaft; the first guide claw swings relative to the second guide claw to realize automatic bundling of the strap passing through two holes of the bundled workpiece.

The application discloses a household intelligent electric baking pan and a use method thereof, and belongs to the technical field of intelligent kitchen appliances. The household intelligent electric baking pan comprises the following steps: S1, an upper disc and a lower disc and a flexible hinge are arranged, and an annular waveguide type ultrasonic array is arranged on the edge of the lower disc; S2, food materials are placed, and the pre-tightening force of a spring is adjusted to make the upper disc flexibly contact the surface of the food materials; S3, heating is started, a heat field is modulated through an independent high-frequency duty cycle, and internal heat flow of the food materials is directionally guided; S4, ultrasonic assistance is started, and micro-vibration is conducted by using an annular array standing wave, thereby breaking a steam film effect and improving efficiency; and S5, an acoustic impedance feedback signal is acquired in real time, and doneness is determined according to signal mutation characteristics and cooking is stopped. The application realizes self-adaptive optimization of micro-environment pressure during cooking.

The utility model relates to the technical field of coking wastewater treatment of steel mills, in particular to efficient wastewater purification and waste heat recovery integrated equipment for coking of steel mills, which comprises a rough filtration tank, an aeration tank is fixedly mounted on the outer surface of the rough filtration tank, and a heat preservation water tank is buried on the ground of one side of the rough filtration tank. And heat dissipation fins are fixedly mounted in the filtering sedimentation tank. According to the efficient wastewater purification and waste heat recovery integrated equipment for coking in the steel mill, wastewater is filtered by a filtering fence after being discharged into a coarse filtering box and then enters a filtering and settling pond to be filtered step by step, and when the wastewater flows through the filtering and settling pond, heat of the wastewater is absorbed by heat dissipation fins, so that the heat dissipation efficiency of the wastewater is improved. At the moment, the first circulating water pump is started to pump out the water in the heat preservation water tank and take away heat, so that the temperature can be reduced while impurities in the waste water are settled, the temperature can be stored in the heat preservation water tank, and the heat of the waste water can be recycled for other purposes.

This invention relates to an ultrasonic field-enhanced gas-filled leaching tank, comprising a tank body, a stirring device, a gas filling device, and an ultrasonic generator. The tank body has a leaching chamber with an open upper end. The stirring head of the stirring device is located inside the leaching chamber. The gas filling device includes a gas filling pipe, with its inlet located outside the leaching chamber for connecting to an external gas supply device, and its outlet located inside the leaching chamber. The ultrasonic generator includes an ultrasonic probe, which is disposed inside the gas filling pipe to generate an ultrasonic field enhancement effect when gas is transported through the gas filling pipe. Compared with the prior art, the ultrasonic field-enhanced gas-filled leaching tank provided by this invention enhances the synergistic oxidation of oxidants and non-ferrous metals through ultrasound, achieving rapid and efficient leaching of non-ferrous metals. The advantage of this technology is that ultrasound can generate strong liquid flow shear force and microbubbles, increasing the contact area between the liquid and the metal surface, promoting the reaction between the oxidant and the non-ferrous metals, and improving leaching efficiency.

This utility model discloses a prefabricated building integrating concealed heating and ventilation channels, relating to the field of building equipment technology. It includes a prefabricated building body, with an air supply component fixedly installed on the outer wall of the prefabricated building body. A sensing component is connected to the top of the air supply component, which includes a distribution box. A mixing pipe is fixedly connected to the end of the distribution box away from the air supply component. A connecting component is fixedly connected to the end of the mixing pipe. A first ventilation pipe is fixedly connected to the end of the connecting component away from the mixing pipe. A second ventilation pipe is connected to the end of the first ventilation pipe. This utility model features a structure linking the air supply component and the sensing component, enabling stable introduction and delivery of external air to the distribution box. The rotation of the air guide plate is driven by the thermal expansion and contraction effect of ether within the annular cylinder, automatically adjusting the opening state of the cold and hot air ducts according to the ambient temperature. This achieves a passive temperature control function that switches between cold and hot air without the need for an electrical control system. The structure is simple, the response is sensitive, and the energy consumption is extremely low.

The utility model relates to resin production technical field especially resin production line's reation kettle, solved the problem that part material will be attached to the inner surface of heat preservation jar body in prior art, lead to the problem of reaction rate reduction and resource waste. A kind of resin production line's reation kettle, including support seat, the inside fixed mounting of support seat has reation kettle body, the inside of reation kettle body is provided with cleaning component, cleaning component includes support rod, rotating motor, transmission rod, stirring piece, bearing, connecting table, gear ring, scraping strip, gear and transmission disc. The utility model not only can improve the uniformity of material mixing, accelerate the reaction between materials, simultaneously still can scrape off the mixture attached to the inner surface of reation kettle body, avoid material attachment in the inner surface of reation kettle body lead to the reaction rate reduction, and when discharging, still can avoid the mixture attachment in the inner surface of reation kettle body lead to unable to discharge.

The application discloses a preparation method of a lithium ion battery negative electrode material of g-C3N4 doped with CuO with a sandwich-shaped morphology. Firstly, g-C3N4 is prepared by using a thermal polymerization method and calcining melamine as raw material; then, a CuO / C3N4 composite material is obtained by adding g-C3N4 in the process of preparing CuO by using a precipitation method. The preparation process is simple and convenient, and the cost is low. The negative electrode material prepared by the method has a high specific surface area, which is helpful to improve the specific capacity of the material. The g-C3N4 is inserted into the middle of CuO layers, which relieves the volume expansion of CuO during large-current charging and discharging. The CuO / C3N4 composite material has excellent rate performance and charging and discharging cycle stability as a lithium battery negative electrode material.

This invention relates to a dedicated clutch chainring assembly for a mid-drive motor. This chainring assembly, used to control the speed of the mid-drive motor, includes a bottom bracket, a first crank, and a second crank. A first chainring is mounted on the bottom bracket, and a rotating component is concentrically mounted on the first chainring. A first spring is provided between the rotating component and the first chainring to generate rotational resistance and to reset the rotating component during rotation. The magnitude of the rotational resistance is positively correlated with the rotation angle of the rotating component. This invention modifies the chainring so that the teeth on the chainring can rotate, and achieves stepless control of the mid-drive motor based on pedaling force. It not only accurately and quickly identifies and responds to pedaling force, allowing the mid-drive motor to adjust accordingly and improve the riding experience, but also integrates sensors with the chainring, simplifying the vehicle's structure and size, making the vehicle more aesthetically pleasing.

This invention belongs to the field of pharmaceutical chemical synthesis technology, specifically relating to a method for preparing high-yield dicyandiamide by urea pyrolysis. The method includes a reaction process using urea and alkaline earth metal oxides as raw materials in a sealed environment, wherein the reaction pressure is 0.1 to 0.3 MPa. Experiments show that by maintaining a positive pressure environment of 0.1 to 0.3 MPa in a dynamically sealed continuous rotary kiln, the volatilization loss of isocyanate (HNCO) is suppressed from a physical process perspective. This reduces the degree of escape of volatile isocyanate (HNCO) during pyrolysis and promotes its further reaction with the solid matrix (alkaline earth metal oxide matrix), thereby improving the raw material utilization rate and dicyandiamide yield. In particular, when the pressure in the dynamically sealed continuous rotary kiln is 0.2 MPa, the yield of the obtained dicyandiamide is 93.5% while maintaining a purity of 99.88%.

The application discloses an alumina ceramic membrane sintering aid and a preparation method and application thereof, relates to the technical field of ceramic membranes, and the alumina ceramic membrane sintering aid is composed of nano silicon oxide and foamed powder, wherein the foamed powder comprises 20 parts of alumina powder, 50-80 parts of potassium feldspar, 5-20 parts of sodium feldspar, 0.1-1 part of sodium carboxymethyl cellulose, 0.1-1 part of sodium tripolyphosphate, 0.5-3 parts of sodium hexametaphosphate, 0.3-1 part of 1000-mesh manganese dioxide, 0.1-0.6 part of 1000-mesh silicon carbide and 100 parts of water. The alumina ceramic membrane sintering aid is controllable in particle size, and the temperature can be controlled when the alumina ceramic membrane sintering aid is applied to the preparation process of an alumina ceramic membrane support. In the preparation process of the alumina ceramic membrane support, the nano silicon dioxide in the sintering aid can adjust the viscosity of high-temperature liquid, accelerate the reaction between the sintering aid and the alumina powder, has a larger bridging effect, and the porous liquid at high temperature can guarantee the strength of the alumina ceramic membrane support and increase the porosity.

The application discloses a method for obtaining high-yield and high-purity epsilon-caprolactone (epsilon-CL) through thermal catalytic depolymerization of PCL, which comprises the following steps: drying and impurity-removing pretreatment of hydroxyl-terminated PCL; mixing the pretreated PCL with a metal ion coordination catalyst, reducing viscosity at a temperature higher than the melting point of PCL by 10-100 DEG C, then performing thermal decomposition reaction under a pressure of 0.01-0.05 MPa, and simultaneously performing vacuum distillation to separate the generated epsilon-CL, caprolactone oligomer and water from the system. In the application, the reversible dynamic coordination metal coordination catalyst dissociates active centers such as ruthenium ions, iron ions, copper ions and cobalt ions at a lower temperature, the metal ions are coordinated with ester groups in the PCL main chain to reduce the breaking energy, and the breaking occurs under the attack of end hydroxyl groups; at this time, the metal ion coordination and the backbite of end hydroxyl groups synergize, the breaking continuously expands to the center, the PCL is gradually broken in a 'unzipping' depolymerization mode and is circularly formed into epsilon-CL.

The present application belongs to the technical field of nuclear power plant plug sealing, and particularly relates to a tin-bismuth alloy filling mode and a sealing detection method for nuclear power. The plug is sealed by combining tin-bismuth alloy sealing and mechanical sealing. When the fast reactor is running, the tin-bismuth alloy is in a condensed solid state, and the temperature of the condensed tin-bismuth alloy is not higher than 90 DEG C, so that the tin-bismuth alloy is completely solidified, and the plug cannot be rotated at this time. Before refueling maintenance, the alloy is melted, and the temperature is kept between 160 DEG C and 180 DEG C after melting. At this time, the plug is rotated in the molten tin-bismuth alloy through a skirt plate, so that the reactor cavity is isolated from the reactor top shield, and the refueling maintenance work is completed. The plug is sealed to the rotating surface by using tin-bismuth alloy and mechanical sealing. When the tin-bismuth alloy is in a solid state, the mechanical sealing structure can ensure the integrity of the reactor pressure boundary and prevent argon in the reactor vessel from leaking into the atmosphere. When the tin-bismuth alloy is in a molten state, the mechanical sealing structure is lifted, so that the rotation of the plug is not affected, and the sealing reliability is ensured.

This utility model belongs to the field of intelligent connected vehicle safety alarm technology, and particularly relates to an intelligent connected vehicle safety alarm device, including a fixing plate. In this intelligent connected vehicle safety alarm device, limit blocks are fixedly connected to both sides of the fixing plate, a protective frame is provided on the top of the fixing plate, and a dustproof and heat dissipation component is provided on the side of the protective frame. By setting the dustproof and heat dissipation component, a slider first slides inside a groove, thereby driving the dustproof net inside the mounting plate to move up and down. Then, a second movable block moves up and down on top of the first movable block. When the dustproof net is closed, a locking block is engaged in a rectangular groove, and under the action of a spring, a limiting rod is engaged inside the groove, thus fixing it. Conversely, it can be disassembled and cleaned regularly, which can reduce the occurrence of such problems from the source and provide strong protection for the safe driving of intelligent connected vehicles.

The invention belongs to the technical field of dissolution of bauxite, and particularly relates to a low-alkali-consumption dissolution method for bauxite with high chlorite content. Carrying out phase detection on the bauxite in each ore spot, respectively using the bauxite according to the types of the ore components, independently stacking the bauxite with the chlorite content higher than 10% for use, and independently dissolving out the bauxite. In the high-temperature dissolution process of the high-chlorite bauxite, chlorite does not react with sodium hydroxide to generate sodium silicon slag, the content of sodium oxide in the red mud is low, and alkali consumption in aluminum oxide production is low.

This invention relates to a nitrogen-phosphorus co-doped composite carbon nanotube catalyst, its in-situ growth preparation method, and its application. The in-situ growth preparation method includes the following steps: immersing a conductive nickel-containing substrate with a three-dimensional porous structure in a precursor solution containing both nitrogen and phosphorus elements; removing and drying the substrate; and then subjecting it to a calcination reaction in a flame under a combustible atmosphere. This causes the precursor to burn and decompose on the substrate surface, resulting in an in-situ reaction and growth of a three-dimensional network structure of nitrogen- and phosphorus-doped carbon nanotubes embedded with nickel nanoparticles. After cooling, the nitrogen-phosphorus co-doped composite carbon nanotube catalyst is obtained supported on the substrate. Compared with existing technologies, this invention enables the one-step, rapid, and inexpensive preparation of a non-precious metal catalyst with a highly conductive network, abundant active sites, and excellent stability on a conductive substrate, which can be directly used for efficient water electrolysis to produce hydrogen, thereby promoting its large-scale industrial application.

The application provides a low-voltage large-current test device and a control method thereof, and belongs to the technical field of current test. The test device comprises a man-machine interface unit, an industrial control computer, a closed-loop control and acquisition unit, a programmed voltage source, a logic control unit and a multi-magnetic circuit current generating device. The man-machine interface unit and the industrial control computer are in bidirectional communication. The industrial control computer is electrically connected with the closed-loop control and acquisition unit, the programmed voltage source and the logic control unit respectively, and is used for data processing and control scheduling. The output end of the programmed voltage source is connected with the logic control unit, and the output end of the logic control unit is connected with the multi-magnetic circuit current generating device. The closed-loop control and acquisition unit is electrically connected with the industrial control computer and the multi-magnetic circuit current generating device respectively. The application can connect the test loop according to the phase angle of the setting requirement, test the current protection function of the test product, and has the characteristics of accurate phase angle, rapid reaction, low cost and simple maintenance.