3666 results about "Induction coil" patented technology

Embodiments of the present invention provide a therapeutic device. The therapeutic device includes a first substructure including a Printed Circuit Board (PCB), a transmitter induction coil electrically coupled to the PCB, and a power source electrically coupled to the transmitter induction coil. The therapeutic device further includes one or more second substructures including one or more of respective stimulation elements and one or more respective receiver induction coils electrically coupled to the one or more respective stimulation elements. The one or more stimulation elements are configured to be facing towards a body portion of a user, when in use. Also, the one or more receiver induction coils are configured to receive power from a magnetic field generated by the transmitter induction coil.

The invention discloses a rolling and annealing treatment process for a copper-steel composite strip, and relates to the technical field of material rolling, the process comprises the following steps: selecting a high-purity copper plate and a stainless steel plate, and depositing a nano nickel / graphene composite transition layer through a magnetron sputtering technology; the stainless steel layer is promoted to deform through front-section low-speed high-pressure rolling, and the copper layer interface bonding force is improved through rear-section high-speed low-pressure rolling; performing short-time local annealing by using a high-frequency induction coil; honeycomb-shaped micro-pits are formed in the stainless steel surface through the laser micro-texture technology, and the interface bonding force is improved in combination with the nano-nickel / graphene layer. Copper layer hardening is eliminated through low-temperature annealing, stainless steel recrystallization is promoted through medium-temperature annealing, and a nanometer precipitated phase is fixed through rapid water cooling; the heating rate is controlled, and nitrogen-hydrogen mixed gas is used for preventing oxidation; the rolling process and the annealing process are seamlessly connected, and the temperature, the stress and the atmosphere are detected in real time through an online monitoring system. The mechanical property, the corrosion resistance and the machining stability of the copper-steel composite strip are remarkably improved.

The invention relates to the technical field of cold crucible smelting furnaces, in particular to a magnetic suspension smelting device of a multi-station water-cooling crucible, which comprises a furnace chamber, an induction coil and a crucible, the top of the furnace chamber is provided with a furnace cover, the side part of the furnace chamber is provided with a furnace door and a vacuum system for vacuumizing the interior of the furnace chamber, and the induction coil and the crucible are arranged in the furnace chamber. The plurality of crucibles are arranged on a crucible support together, a driving device is arranged at the bottom of the crucible support, and the driving device can drive the crucible support to ascend, descend and rotate, so that the crucibles can enter and exit from the center of the induction coil in sequence. After the interior of the furnace chamber is vacuumized, multiple smelting operations can be carried out in the atmosphere of argon filling after a single vacuumizing state, the operation steps are simple and convenient, the middle actions such as multiple vacuumizing and vacuum breaking are omitted, in addition, only one vacuumizing device and one motor driving device are adopted in the whole device, continuous and automatic smelting can be achieved, and the production efficiency is improved. The production efficiency is greatly improved; and the cost is saved.

The invention relates to the technical field of vacuum induction heating temperature control, and discloses a vacuum induction heating temperature closed-loop control system integrated with SCADA (supervisory control and data acquisition), which is characterized in that a functional material layer with preset Curie temperature is compounded on the surface of an induction coil, and the absolute value of phase difference is analyzed by collecting voltage and current signals of the coil in real time; according to the invention, through the synergistic effect of the electromagnetic impedance sudden change characteristic of the functional material layer and the phase difference detection mechanism, non-contact accurate control of the phase change critical temperature of the workpiece is realized; and meanwhile, due to the coupling application of the asymmetric micro-pulse waveform design and the dynamic adjustment strategy, the contradiction between thermodynamic response and electromagnetic interference in a vacuum environment is effectively balanced, and the control precision and stability of the system are remarkably improved.

The invention provides an ultrasonic vibration auxiliary brazing device for a superhard abrasive formed grinding wheel and an operation method of the ultrasonic vibration auxiliary brazing device, the device comprises a motion control system, an ultrasonic vibration system, a high-frequency induction brazing system and a formed grinding wheel fixing device, and the formed grinding wheel to be brazed is fixed on the fixing device through a spring chuck. The motion control system is composed of a sliding block arranged on the movable guide rail and a motor controlling the sliding block to move and can control the vertical moving speed and direction of the sliding block on the guide rail. The ultrasonic vibration system comprises two ultrasonic vibration amplitude-change poles, a piezoelectric ceramic transducer and an external ultrasonic power supply, each piezoelectric ceramic ultrasonic amplitude-change pole can provide longitudinal vibration, and two-dimensional oval ultrasonic vibration in the brazing process is achieved through synthesis of the longitudinal vibration in the two vertical directions; the motion control system drives the brazing head to move up and down according to the brazing progress, and cooling water circulates in an induction coil of the brazing head. The problems that in the brazing process of the formed grinding tool, brazing filler metal distribution is not uniform, the machining quality is low, the brazing temperature is too concentrated, and the metallurgical reaction is serious in the process are solved.

The invention discloses a method for dynamically monitoring and automatically processing abnormity of an entrance and an exit of a parking lot, relates to the technical field of intelligent parking lot management, and aims to solve the problems that existing unattended parking lot entrance and exit management depends on manpower, abnormity processing is passive, and the misjudgment rate is high. The method is based on an information acquisition and execution layer-edge processing layer-cloud platform three-layer architecture, the core realizes high-precision scene understanding through a multi-algorithm fused visual perception module, multi-modal data weighted fusion is combined with a ground induction coil, a radar and the like, and the misjudgment rate is reduced; a sensing result is converted into an automatic processing action through a configurable intelligent rule engine; and meanwhile, the cloud platform stores passing data and an evidence chain, optimizes an AI model through incremental training and returns the AI model to an edge layer, so that closed-loop evolution is realized.

An inductive position sensor, comprising: a movable part (1) which is a magnetic conductor; and an induction coil assembly (100) adjacent to the movable part (1), wherein the induction coil assembly (100) and the movable part (1) form a magnetic circuit, the induction coil assembly (100) has an input end for inputting a current and an output end for outputting a feedback current; the inductive position sensor is used to detect a position of the movable part (1) based on a relationship between the feedback current and the input current. The inductive position sensor of the present disclosure has flexible and compact structural design, and can be adjusted and arranged according to different applications and structural spaces, so it is applicable to a wide range of environments. An electromagnetic clutch is also proposed.

The invention provides a semi-aviation transient electromagnetic acquisition device and method for calibrating data drift in real time, and relates to the technical field of data calibration, and the device comprises an electromagnetic data acquisition unit which receives a secondary induction signal generated by a ground transmitting end through a transient electromagnetic hollow induction coil disposed in a coil storage cabin of an unmanned aerial vehicle, and transmits the secondary induction signal to an unmanned aerial vehicle; self-adaptive gain control is carried out according to the signal intensity to obtain real-time electromagnetic data; the flight control unit monitors the swing amplitude and frequency of the coil in real time according to the inclination angle and acceleration data fed back by the sensor in the coil storage cabin, and carries out flight attitude adjustment and control; the drift calibration unit adopts a static reference mode for calibration at the beginning stage of flight; and switching to a dynamic reference mode in the flight process, and carrying out self-adaptive calibration on the real-time data stream based on a sliding window. According to the invention, drift calibration of traditional software post-processing is migrated to a hardware acquisition stage, so that synchronous completion of data acquisition and drift compensation is realized.

The invention relates to the field of bearing heat treatment, and discloses uniform-heating bearing processing heat treatment equipment which comprises a heat treatment workbench and a heating controller mounted on the heat treatment workbench, the bearing machining heat treatment equipment further comprises an induction line connected to the heating controller, an induction coil connected to the induction line, two sets of supporting bases symmetrically and fixedly installed on the heat treatment workbench relative to the induction coil, driving rotating rods rotationally installed on the supporting bases, and driven rotating rods movably installed on the supporting bases. A moving assembly for regulating and controlling the distance between the driven rotating rod and the driving rotating rod is arranged on the supporting seat; a rotating seat is fixedly connected to the driven rotating rod, and a clamping assembly for clamping and limiting a bearing workpiece is arranged on the rotating seat; the heat treatment device can centrally limit heat treatment processing of the bearing and control the bearing to rotate during heat treatment processing, so that heat is uniformly transmitted and distributed on the bearing, and the condition of local overheating of the bearing is avoided.

The invention discloses an oil abrasive particle multi-channel detection device based on Helmholtz coils, and belongs to the technical field of oil abrasive particle detection, the detection structure comprises an excitation assembly and an induction assembly, the excitation assembly comprises excitation coils and a tubular outer-layer skeleton, the excitation coils are wound around the two ends of the outer portion of the tubular outer-layer skeleton, and the induction assembly is wound around the tubular outer-layer skeleton. And a uniform magnetic field is generated. The induction assembly comprises a plurality of induction units arranged side by side. According to the invention, the Helmholtz excitation coil and the multiple groups of differential induction coils are designed, and the multiple induction units are arranged side by side to form a multi-channel detection system; the Helmholtz excitation coil generates a uniform magnetic field in a detection area, so that the detection system can keep consistent sensitivity to metal abrasive particles at different radial positions, and meanwhile, the throughput of mechanical oil is ensured by parallel connection of multiple channels; the problem of inaccurate detection caused by non-uniform radial magnetic field of an induction type oil abrasive particle detection system in a large-circulation pipeline is effectively solved.

The invention relates to the field of electromagnetic nondestructive testing, in particular to a curved surface self-adaptive eddy current testing probe, a nondestructive flaw detector and a testing method. The eddy current detection probe comprises a magnetic core bundle, an excitation coil and an induction coil. Wherein the magnetic core bundle is formed by densely arranging a plurality of ferromagnetic magnetic needles; and the excitation coil and the induction coil radially limit the magnetic core bundle. The excitation coil is wound on one end of the magnetic core bundle away from the detection surface and is used for connecting an adjustable power supply. The exciting coil generates an alternating magnetic field for detection in a target area by using the adjustable power supply, and magnetizes the magnetic core bundle by using the adjustable power supply, so that the detection surface of the eddy current detection probe is tightly adsorbed with the target area on the surface of a detected object. And the induction coil is wound at one end, close to the detection surface, in the magnetic core bundle and is used for inducing a signal generated by a detected object in the detection process. According to the invention, the problem that the existing electromagnetic nondestructive testing probe cannot be attached to various complex curved surfaces to cause signal attenuation and influence the measurement precision is solved.

The invention relates to the technical field of wafer processing, in particular to a reaction chamber and plasma processing equipment, which comprises a quartz tube, an induction coil, a Faraday shield cage, a state monitoring device, a rotation driving device and a control unit, and is characterized in that the quartz tube is arranged at the top of a processing chamber; the induction coil is arranged around the outer side of the quartz tube; the Faraday shielding cage is provided with a slit, and the orthographic projection of the slit on the circumferential wall of the quartz tube forms an erosion area; the state monitoring device is used for monitoring the erosion area; the driving end of the rotary driving device is connected with the quartz tube or the Faraday shielding cage; the control unit is in communication connection with the state monitoring device and the rotary driving device; according to the invention, through real-time monitoring and an active regulation and control mechanism, the problem of concentrated erosion of plasma to the quartz tube in a high-hydrogen process is effectively solved.

The invention discloses an efficient anti-freezing and anti-blocking integrated induction heating system and method for an oil and gas pipeline, belongs to the technical field of anti-freezing and anti-blocking of oil and gas pipelines, and aims at solving the problems that in the prior art, heating efficiency is low, energy consumption is huge, heating uniformity and adaptability are poor, the system integration degree is low, and the intelligent degree is insufficient. Comprising the steps of S1, induction heating unit arrangement and power management; s2, real-time temperature monitoring and data acquisition; s3, intelligent data analysis and precise heat management; the electromagnetic induction heating principle is adopted, the induction coil directly heats the pipeline and the internal medium, heat conduction loss and heat energy radiation loss of heating modes such as traditional resistance wires and heat tracing bands are reduced, the intelligent power management module can optimize power supply and power adjustment, and the self-adaptive environment and load adjustment strategy is combined, so that the self-adaptive load adjustment is achieved. The heating power can be automatically adjusted according to the environment temperature and the pipeline load, the anti-freezing and anti-blocking effect is guaranteed, meanwhile, energy consumption is remarkably reduced, and the burden of an electric power supply system is relieved.

The invention discloses post-processing equipment for a rolled strip, relates to the technical field of strip rolling post-processing, and aims to solve the problems of waved edge warping and overall warping caused by non-uniform residual stress distribution of edge and central areas after a metal strip is rolled in the prior art. Comprising a gradient annealing device and an edge stress grading regulation and control device, the gradient annealing device at least comprises a plurality of heating roller groups; the plurality of heating roller groups are arranged at equal intervals along the moving direction of the strip, each heating roller group comprises two heating rollers, the two heating rollers respectively heat the upper surface and the lower surface of the rolled strip, each heating roller at least comprises a magnetic induction coil, and the coil density of the magnetic induction coil is gradually reduced from the edge part to the middle part; the edge stress grading regulation and control device at least comprises a plurality of edge pressing roller sets arranged in the strip moving direction. The included angle between each edge pressing roller set and the width direction of the strip is gradually reduced in the moving direction of the strip. The method is used for realizing precise regulation and control of the residual stress.

The invention relates to the technical field of transformers, and discloses a transformer with dustproof and moistureproof functions. Comprising a rotary dust removal mechanism, a variable-frequency heating and dehumidifying mechanism, an induction coil which is fixedly mounted in a second gas flowing cylinder and cooperates with a high-frequency current generator to generate an alternating magnetic field phenomenon, and a metal rod which is mounted in the center of the induction coil and generates a heating phenomenon after being influenced by the alternating magnetic field. According to the transformer with the dust-proof and moisture-proof functions, the dust-proof effect can be achieved on gas entering the transformer protection cabinet, the filter cover used for dust removal rotates at a high speed, the gas attached to the outer surface of the filter cover can be thrown away by centrifugal force, and therefore the normal working time efficiency of the filter cover is guaranteed; the device can perform a heating dehumidification effect on dedusted gas, so that humid gas is prevented from entering a transformer protection cabinet, the working environment of a transformer is improved, and the effective service life of the transformer is prolonged.

The new energy automobile outdoor charging pile with the rainy day electric leakage detection function comprises a box body, supporting legs, a charging wire, a charging gun, a charging module, a controller and a spraying mechanism, a first motor is arranged at the bottom of the box body and is in drive connection with a disc, the disc is connected with a rotating plate through a first electric push rod, and a vertical plate is arranged on the top face of the rotating plate; the two sides of the vertical plate are connected with a first shell and a second shell through a second electric push rod and a third electric push rod respectively, the first shell is provided with an analog interface, the second shell is provided with a moving mechanism, the bottom of the moving mechanism is provided with an arc-shaped plate, the inner side wall of the second shell is provided with a cylinder, the cylinder is sleeved with a sealing ring, and the end of the charging gun is provided with an annular groove. A sealing ring and an air bag are arranged in the annular groove, the air bag is connected with an air pump, and the charging wire is sleeved with an induction coil. The spraying mechanism is arranged to simulate the rainy day environment, the induction coil is used for detecting the leakage current of the charging line, the sealing ring is replaced when the leakage current exceeds a preset value, the sealing performance is improved, and electric leakage accidents during charging in rainy days are avoided.

The invention discloses a device and a method for preparing single-wall and few-wall carbon nanotubes, and relates to the technical field of nano carbon materials, the device structurally comprises a heating system, a feeding system, a gas path system, a cooling system and an electrical system, the heating system comprises a medium-frequency induction furnace, an induction coil and a graphite crucible; the gas path system comprises a gas inlet; the feeding system comprises a second catalyst feeding hole and a discharging hole; wherein the feeding hole is formed above the graphite crucible, the air inlet is formed in the side surface of the medium-frequency induction furnace, and the discharging hole is formed in the other side of the medium-frequency induction furnace. The metal molten pool is used as a heat source, a steady-state heat source is provided for catalyst evaporation and single-wall / few-wall carbon nanotube growth, compared with a plasma method and an electric arc method, catalyst evaporation is more uniform and mild, the catalyst utilization rate is increased, and the single-wall / few-wall carbon nanotube growth efficiency is remarkably improved.

The invention relates to the technical field of wafer processing equipment, in particular to a reaction cavity and plasma processing equipment, comprising a quartz tube, an induction coil and a shielding member, the quartz tube is arranged at the top of a processing chamber; the induction coil is arranged on the outer side of the quartz tube in a surrounding manner and comprises a plurality of annular sections which are arranged at intervals in the axial direction of the quartz tube and a plurality of connecting sections which are arranged between every two adjacent annular sections and are used for connecting every two adjacent annular sections; the shielding component is annularly arranged between the quartz tube and the induction coil and comprises a plurality of annular shielding parts arranged in the axial direction of the quartz tube and a plurality of arc-shaped shielding parts arranged between every two adjacent annular shielding parts and used for connecting every two adjacent annular shielding parts; a slit is formed between two adjacent annular shielding parts; concentrated bombardment of high-energy ions on the inner wall of the quartz tube can be obviously prevented, so that erosion of the quartz tube is effectively reduced, particulate matter is reduced, the service life of a machine is prolonged, and the process yield is increased.

The utility model discloses a liquid suspension optical energy rotation device and a device core body thereof. A core body of the device comprises a rotating shell, a control circuit board, a field magnet located in the rotating shell, a plurality of induction coils matched with the field magnet, a light energy plate used for converting light energy into electric energy and a base body located in the rotating shell. The suspension body is located in the rotating shell and fixedly connected with the base body, and the inner suspension liquid is located in the rotating shell and used for enabling the suspension body to float upwards to a preset position in the direction where the rotating center line is located. The base body and the rotating shell can rotate relatively around a rotating center line. The field magnet is fixedly connected with the rotating shell, all the induction coils are arranged around the rotating center line at intervals and assembled on the base body, the control circuit board is assembled on the base body and electrically connected with the light energy plate and the induction coils, and the light energy plate is assembled on the base body. The core body of the device counteracts the gravity by means of buoyancy, so that the friction resistance of rotation is effectively reduced.

The invention provides an infrared pulse thermal radiation grinding burn nondestructive testing method and system, and belongs to the technical field of nondestructive testing. Comprising the following steps: inputting an excitation signal to an induction coil, and inducing a pulsed eddy current in a tested part for heating; a thermal infrared imager and a depth camera are used for obtaining a thermal response temperature matrix of a measured area of the part and a three-dimensional point cloud of the measured area; then, constructing a thermal response model of the part; extracting a time sequence temperature curve of the heating stage and the natural cooling stage of the detected area, and establishing a grinding burn discrimination function to judge whether a grinding burn area exists or not; and the thermal infrared imager and the depth camera are calibrated, the grinding burn area under the coordinate system of the thermal infrared imager is projected into the three-dimensional point cloud of the depth camera, the position of the grinding burn area under the world coordinate system is obtained, and detection and positioning of the grinding burn area are achieved.

The invention discloses a method for measuring a circumferential alternating current loop of a magnetic microwire based on LabVIEW. The method realizes loop measurement based on LabVIEW program control, and comprises the following steps of: connecting a magnetic microfilament and a resistor in series and then connecting the magnetic microfilament and the resistor into a signal generator, and simultaneously connecting another channel of the signal generator into an oscilloscope. The other two channels of the oscilloscope measure voltage signals at the two ends of the magnetic microfilament and the resistor at the same time and are connected to a computer to achieve control. The LabVIEW program reads a voltage signal measured by the oscilloscope, and carries out digital filtering processing, numerical integration processing, image display processing, and data recording and storage. Through the two steps, the circumferential alternating-current hysteresis loop of the magnetic microfilament can be measured. According to the method, the use of an induction coil is avoided, an indirect measurement method is obtained and demonstrated through physical derivation, the annular alternating-current hysteresis loop of the material is obtained, the measurement mode is simple enough, and only two common devices, namely a signal generator and an oscilloscope, are needed.

The invention relates to the technical field of industrial process control, and discloses a vacuum induction heating process closed-loop control system applying an industrial mechanism model, which comprises the following steps: acquiring the input active power of an induction coil through a power monitoring unit, and measuring the total external radiation heat flux of the outer wall of a vacuum chamber by a heat flow sensing unit; the embedded decision-making module calculates the thermal-electric response ratio and the time derivative thereof in real time, judges the phase change critical state of the material based on the derivative change and generates a regulation and control instruction, through dynamic capture of the thermal-electric energy balance relation, recognition of the phase change critical point of the material is achieved, and by combining working condition pre-judgment of the vibration spectrum entropy and current ripple characteristic arbitration, the phase change critical state of the material is judged. An anti-interference multi-verification mechanism is constructed, and the robustness of the control system under the preset working condition is improved.

The invention relates to the field of helicopter wing anti-icing and deicing, in particular to a helicopter anti-icing and deicing system applying rotor wing kinetic energy recovery and an operation method. The helicopter anti-icing and deicing system applying rotor wing kinetic energy recovery comprises an electric heating deicing device, a kinetic energy recovery device and a helicopter rotor wing key assembly. The electric heating deicing device is composed of a high-resistivity metal heating wire and an icing detector, and the device transfers heat to the surface of the wing for deicing through heating of the high-resistivity heating wire. The kinetic energy recovery device is composed of an electric energy rectification, voltage stabilization and energy storage device, a permanent magnet and a magnetic induction coil. Kinetic energy generated when the rotor rotates is converted into electric energy through the electromagnetic induction technology and stored in a battery pack. The helicopter rotor key assembly is composed of a helicopter blade and a helicopter swash plate and is a key component of the helicopter rotor. According to the invention, the kinetic energy of the helicopter rotor is recovered to prevent and remove ice, so that the overall energy utilization efficiency is improved, and the environmental adaptability and safety of the system are also improved.

Disclosed are a laser manufacturing microstructure partition regulation and control device and a corresponding method based on matrix modular temperature control. An inner portion of the device's console provides a plurality of temperature regulation and control elements arranged in a matrix form so that a workpiece is divided into different areas. During the laser manufacturing process, the temperature of the workpiece is monitored in real-time via a temperature detector; a wireless communication device is used for feeding back the collected data to a computer; the computer judges whether the workpiece needs to be heated or cooled, then the signal is transmitted to the wireless communication device, and the console controls an induction coil or a cooling nozzle to perform partition regulation and control on the temperature of the workpiece according to the signal so that the workpiece has a specific temperature gradient from a cladding layer to a substrate direction.

The invention relates to the technical field of sensors, and provides a fluxgate current sensing chip, a manufacturing method and an application method. The fluxgate current sensing chip comprises a first sensing unit, a second sensing unit and a conductor channel between the first sensing unit and the second sensing unit, each sensing unit comprises a magnetic core and a coil, the coil comprises an excitation coil and an induction coil, the excitation coil and the induction coil are wound on the magnetic core, and the conductor channel is arranged between the first sensing unit and the second sensing unit. A shaft of a magnetic core wound by the induction coil is used as a sensitive shaft of the sensitive unit; the first sensing unit and the second sensing unit detect current to be detected by sensing a magnetic field near the upper surface and a magnetic field near the lower surface of the conductor channel. The differential detection structure is formed by the two sensing units and the conductor channel between the two sensing units, a magnetism gathering ring structure does not need to be used, chip formation of the current sensor is achieved, the detection precision is high, the anti-interference capacity is high, open-loop and closed-loop current detection can be achieved, and the current detection requirements of various application scenes can be met.

The invention relates to the technical field of automatic welding, and discloses a micro welding seam tracking method and system based on electromagnetic induction. According to the method, a high-frequency alternating magnetic field is applied to a welding seam area through an exciting coil in the micro electromagnetic sensing core; an induction coil in the electromagnetic sensing core is used for detecting magnetic field disturbance caused by geometric shape changes of the weld groove, and induction signals are obtained; processing the induction signal through a signal processing circuit integrated in the probe, namely converting the impedance change of the coil into a voltage signal, demodulating and filtering the voltage signal, and extracting a direct-current voltage signal corresponding to the deviation of the probe relative to the central position of the welding seam; the direct-current voltage signals serve as position feedback information to be output to a welding robot control system; and the movement track of the welding robot is adjusted in real time according to the position feedback information, and welding seam tracking and path deviation correction are achieved.

The invention discloses a liquid metal electromagnetic flowmeter capable of eliminating the influence of an environmental magnetic field and a use method. The flowmeter comprises a flow channel, a magnet exciting coil, a first environment magnetic field eliminating coil, a second environment magnetic field eliminating coil, a first signal receiving coil, a second signal receiving coil and a measuring device. Induced electromotive forces generated by an environment magnetic field on the four induction coils are equal, and the electromotive forces of the elimination coil and the signal receiving coil are superposed and counteracted through a specific connection mode, so that the influence of the environment magnetic field is reduced, and the signal-to-noise ratio is improved. When the flow needs to be measured, firstly measuring the phase difference, then adjusting the frequency to determine the working frequency, obtaining the relationship between the flow velocity and the phase difference, inputting the relational expression, finally measuring the phase difference, performing interpolation calculation to obtain the flow velocity, and calculating the volume and mass flow by combining the geometric parameters of the flow channel and the liquid metal density. The device and the method have the advantages of wide measurement range, high precision, strong applicability and the like, are suitable for various environmental magnetic fields and flow channel sizes, are higher in measurement precision and are stable, and measurement signals are not influenced by corrosion of working media.

The invention discloses reservoir underground pore connectivity transformation simulation equipment, a reservoir underground pore connectivity transformation simulation system and an evaluation method. The equipment comprises a rock core transformation clamping device, a first magnet, a second magnet, a nuclear magnetic resonance signal controller, a storage and collection tank and a fluid displacement device, wherein a magnetic induction coil is arranged in the rock core transformation clamping device, and the first magnet and the second magnet are oppositely arranged on the two sides of the rock core transformation clamping device; the nuclear magnetic resonance signal controller is electrically connected with the first magnet, the second magnet and the magnetic induction coil respectively and is used for controlling the magnetic field intensity formed by the first magnet, the second magnet and the magnetic induction coil and measuring a nuclear magnetic signal of a rock core sample in the rock core transformation clamping device; the rock core modification clamping device comprises a fluid inlet, the fluid inlet is communicated with the storage and collection tank, and the fluid displacement device is connected with the storage and collection tank, so that fluid is displaced into the rock core modification clamping device under the action of the fluid displacement device, and modification and evaluation on the pore connectivity of the rock core sample under different fluid pressures are realized.

The invention relates to the technical field of electromagnetic heating temperature rise uniformity optimization, and discloses a train frozen coal induction heating temperature rise uniformity optimization method based on a response surface method and multi-parameter optimization. A second-order polynomial response surface model is designed and established by adopting a central composite test, an axisymmetric coil layout based on a first constant parameterization linear dynamic tolerance sequence is designed, and temperature uniformity is represented by sample standard deviation by applying an NSGA-II multi-objective optimization algorithm under the condition that thawing temperature constraints are met. And carrying out Pareto optimization by taking temperature sample standard deviation minimization and average temperature maximization as targets, and finally determining an optimal parameter combination through a TOPSIS decision method. According to simulation verification, the method can effectively improve the uniformity of the electromagnetic heating temperature field of the inner surface of the frozen coal carriage, and a theoretical basis is provided for engineering application.

Disclosed in the present invention is a ground fault device end-of-life self-test system. An induction coil and a neutral coil are used for sensing and acquiring a ground fault leakage current signal of a live wire or a neutral wire. A trip device is used for cutting off the power supply to a load in the event of a ground fault by driving a solenoid by means of a thyristor which is triggered by an IC1 to turn on. A manual test button is used for manually testing the function of a ground fault device. A rectifying circuit is used for rectifying an alternating current (AC) and outputting same to a direct current, and providing the direct current to IC1 and IC2 direct current power supplies. A ground fault detection circuit is used for completing ground fault detection, and controlling the drive to trigger the thyristor to turn on or off. A ground fault self-test control circuit is used for controlling the testing of a ground fault detection function without affecting normal ground fault detection and protection functions.