579 results about "Electromagnetic coil" patented technology

The invention relates to the technical field of tension control in the material processing process. The electromagnetic coil winding tension control method comprises the steps that real-time state information is input into a wire rod type recognition model to obtain wire rod type information, and a corresponding tension adjusting model is called from a tension control model library based on the wire rod type information to adjust the winding tension of the electromagnetic coil. And inputting the real-time state information into the tension adjustment model to obtain tension adjustment parameter information, comparing the tension adjustment parameter information with preset tension safety boundary information to generate limited adjustment instruction information, executing tension adjustment operation according to the limited adjustment instruction information to obtain feedback tension information, and sending the feedback tension information to the server. The feedback tension information and the limited adjustment instruction information are compared and analyzed, a real-time tension adjustment result is obtained, and if the real-time tension adjustment result meets the target tension range, the current tension adjustment state is kept. The wire winding device has the effect of achieving accurate adjustment of the wire in the winding stage.

The invention discloses an osmometer for safety monitoring of a reservoir dam, which relates to the technical field of safety monitoring, and comprises an outer shell for providing a protection effect, a water seepage hole arranged at the end part of the outer shell, a diaphragm for detecting and judging water pressure, and an electromagnetic coil for detecting the vibration frequency of a steel wire connected with the diaphragm, and the tension adjusting mechanism is used for detecting and adjusting the tension of the steel string in real time so as to ensure the detection accuracy. According to the scheme, the tension adjusting mechanism is additionally arranged at the tail end of the steel string, the tension of the steel string can be detected in real time, when the tension of the steel string is externally influenced or changes, the tension of the steel string can be adjusted in real time, the stability of the steel string in the later use process is guaranteed, and the service life of the steel string is prolonged. Secondly, in consideration of the basic principle when the steel string is used for detection, fixation and movement of the tail end need to be considered, real-time adjustment and fixation of the steel string are synchronously guaranteed according to actual requirements, and therefore it is guaranteed that the steel string can work correctly.

The invention relates to the technical field of liquid metal driving equipment, in particular to an annular channel induction type lead-bismuth electromagnetic pump. The lead-bismuth electromagnetic pump comprises an internal stator, an annular flow channel, an external stator, an electromagnetic coil and an electromagnetic pump shell; the outer wall of the annular runner is coated with a protective layer; the protective layer is made of nanometer flexible heat preservation cotton, the thickness of the protective layer ranges from 5 mm to 10 mm, and the protective layer is configured to enable the surface temperature of the protective layer to be controlled to be 100 DEG C or below. Compared with an existing annular channel induction type lead-bismuth electromagnetic pump, the annular channel induction type lead-bismuth electromagnetic pump has the advantages that the nanometer flexible heat preservation cotton with the better heat insulation performance is mainly adopted as the main material of the protection layer, the heat insulation performance of the protection layer is improved by designing the thickness of the protection layer, and the operation temperature range of the annular channel induction type lead-bismuth electromagnetic pump is widened; the problems that an existing annular channel induction type electromagnetic pump is low in running temperature, consequently, running conditions are limited, and efficiency is low are solved.

The invention relates to the technical field of metal die-casting forming, and discloses a vacuum die-casting method for a high-reliability aluminum alloy motor end cover, which comprises the following steps: carrying out acoustic levitation purification treatment on an aluminum alloy melt; detecting the acoustic purity of the purified melt on line by adopting an acoustic characteristic sensing device; feeding the melt into a mold cavity for vacuum die-casting filling; and according to the detection result of the acoustic purity, an electromagnetic coil preset at the hot spot area of the mold is controlled in a feedforward mode, and magnetic field induction partition solidification of the hot spot area is achieved. According to the method, through the synergistic effect of melt purification and solidification control, micro bubbles and inclusions in the melt are removed through acoustic levitation purification firstly, then accurate magnetic field induction partition solidification is conducted on a hot spot area through feedforward control based on melt quality real-time data, formation of microscopic and macroscopic defects is effectively inhibited, and the quality of the melt is improved. The manufactured motor end cover is high in internal density and good in mechanical property and air tightness, and the product reliability is remarkably improved.

The system and method for decelerating space objects moving at high velocities are provided. The system comprises at least one closed volume containing a combination of gas, liquid, solid particles, or a mixture thereof. The volume can be transported to the targeted location using a range of means, including a chemical gun, light gas gun, electromagnetic coil gun, superconducting quench gun, a rocket, or a combination thereof. The volume is strategically positioned on the trajectory of the moving object. Upon penetrating the walls of the volume, the object passes through it, experiencing deceleration.

The invention discloses a carbon fiber cushion mold positioning and forming device, and relates to the technical field of composite material manufacturing, and a magnetorheological fluid positioning assembly is characterized in that firstly, magnetorheological fluid filled in an annular gap area between a stainless steel cavity and four ceramic pipe sleeves is in a liquid floating state in a pre-mold-closing stage; at the moment, the ceramic pipe sleeve does not exert any rigid constraint, so that the prepreg is allowed to be adjusted within a tiny range due to laying deviation, extrusion friction between the prepreg and the mold is eliminated through flexible adjustment of the magnetorheological fluid, the risk of fiber wrinkles or local breakage is reduced fundamentally, and along with advancing of the mold closing action of the mold, the production efficiency of the prepreg is improved. The ceramic pipe sleeve makes contact with the mold structure, contact force can be transmitted to the first pressure sensor at the top of the ceramic pipe sleeve through the ceramic pipe sleeve, and when the first pressure sensor is used for detecting and promoting a system to judge that the trigger condition of mold closing and locking is met, then the magnetorheological fluid is solidified through a magnetic field generated by the electromagnetic coil; and the ceramic pipe sleeve is in a rigid locking state.

The utility model belongs to the technical field of magnetic separators, and particularly relates to an electromagnetic separator with a heat dissipation coil, which comprises a frame, a conveying mechanism mounted on the frame, a transmission mechanism connected with the conveying mechanism, and a magnetic separation mechanism mounted on the frame. The magnetic separation mechanism comprises a shell, a winding reel is mounted in the shell, the winding reel is connected with a mounting frame, and a mounting ring is mounted on the mounting frame; each installation ring is provided with a plurality of winding supporting rods, electromagnetic wires are wound around the outer sides of the winding supporting rods of the installation rings, the electromagnetic wires sequentially wind around the winding supporting rods of the installation rings from inside to outside along the centermost installation ring, and a heat dissipation gap is reserved between every two electromagnetic wire layers. By arranging the mounting ring and the winding supporting rod, a plurality of gaps are reserved between the electromagnetic coils, heat dissipation of the electromagnetic coils is facilitated, the ventilation holes, the draught fan, the coil pipe, the oil cooler and the temperature sensor are additionally arranged, the temperature in the magnetic separation mechanism can be detected and adjusted in real time, and normal operation of the device is guaranteed.

An axial active magnetic bearing includes a rotating shaft, a magnetic yoke, a permanent magnet, a magnetic barrier structure and an electromagnetic coil. The rotating shaft includes a main shaft and a thrust plate; first and second air gaps with a projected area size having an error smaller than 5% are formed between the magnetic yoke and the thrust plate; the permanent magnet is provided on the magnetic yoke, and a third air gap is formed between the thrust plate and the permanent magnet; a permanent magnet magnetic flux is formed between the permanent magnet and the magnetic yoke; the magnetic barrier structure is provided on the magnetic yoke and positioned in the path of the permanent magnet magnetic flux, the permanent magnet magnetic flux is passed through the barrier structure, the first air gap and the third air gap; the electromagnetic coil is provided in a magnetic yoke chamber.

The invention relates to the technical field of flywheel energy storage equipment, in particular to a flywheel rotor dynamic balance self-adaptive adjusting method and system based on magnetorheological fluid. The method comprises the steps that the sealing state of a magnetorheological fluid cavity is detected through a pressure sensor, and it is ensured that the pressure in the cavity is stable and free of leakage; the non-contact displacement sensor executes zero calibration, and output signal fluctuation is controlled within a preset range; carrying out no-load test on a current output port of the self-adaptive control module; when the rotating speed rises from a static state to a preset rotating speed value, a sensor of the real-time monitoring module synchronously collects a radial vibration signal of the rotor, decomposes a fundamental frequency vibration component with the same frequency as the rotating speed, and calculates the amplitude and the phase of the unbalance; when the rotating speed is stabilized in a preset rotating speed interval, the self-adaptive control module enters a closed-loop adjusting state, and when an unbalanced phase is calculated according to detection, a corresponding compensation quadrant fan-shaped cavity is locked, and the current of an electromagnetic coil is adjusted; the problem of traditional adjustment lag is solved, and over-compensation and under-compensation under variable working conditions are avoided.

The invention discloses a node structure electric arc fuse wire additive manufacturing method, and belongs to the technical field of electric arc additive manufacturing. According to the method, the problems that in the prior art, due to uneven heat distribution, the joint binding force is insufficient, the machining allowance is low, and the welding gun collision risk is caused by too high material accumulation in a joint area are solved; the method comprises the steps that a welding gun deposits a first welding bead along an arcing point, when a second cross welding bead is deposited, a coaxial electromagnetic coil is arranged outside the welding gun, an external alternating magnetic field is generated to act on an electric arc, the electric arc and a molten pool oscillate periodically, and therefore the metal fluidity of the molten pool is enhanced; by applying the external alternating magnetic field, non-contact stirring of the molten pool can be achieved, an additional mechanical movement device is not needed, the molten pool has the advantages of being safe and clean, the fluidity of the molten pool subjected to magnetic arc oscillation stirring is higher, and the problems that materials at nodes excessively accumulate and protrude, and joints of the nodes are heated unevenly and shrink are solved.

This invention discloses a magnetorheological vibration isolator with negative stiffness characteristics, comprising a magnetorheological elastomer (MRE), an iron sheet, a circular magnet, a cylindrical central shaft, an electromagnetic coil, upper and lower base plates, an outer sleeve, and a bar magnet. The MRE, iron sheet, and circular magnet form a multi-layered MRE structure, with the circular magnet providing a portion of the initial magnetic field to the MRE. The electromagnetic coil, located between the multi-layered MRE structure and the outer sleeve, can control the magnetic field strength acting on the MRE in real time, thereby controlling the stiffness and damping of the MRE isolator. The bar magnet and magnet brackets form a negative stiffness generating unit, respectively installed on both symmetrical sides of the isolator. This invention introduces negative stiffness characteristics into a semi-active vibration isolator, improving the vibration reduction effect of semi-active control to the level of active control, while also offering good stability and low system cost. This invention can be applied to lateral vibration control in high-speed trains, improving stability and safety during high-speed operation, and has broad application prospects.

The invention discloses a high-temperature-resistant electromagnetic coil for a control rod driving mechanism of a nuclear power station, which comprises a shell internally provided with a high-temperature electromagnetic coil, a lead end of the high-temperature electromagnetic coil upwards penetrates out of the shell, an electrical penetration piece is arranged at the joint of the lead end and the shell, the electrical penetration piece is arranged on the upper end surface of the shell, and the high-temperature-resistant electromagnetic coil is arranged in the shell. The lead wire end upwards penetrates out of the electrical penetration piece; the outer side of the electrical penetration piece is sleeved with an insulating cloth sleeve, the lower end of the insulating cloth sleeve is arranged on the outer side of the electrical penetration piece in a sleeving mode, and the upper end of the insulating cloth sleeve is arranged on the outer side of the lead wire end in a sleeving mode. Through the collaborative design of the shell, the electrical penetration assembly and the insulating cloth sleeve, the problems of difficult maintenance and poor heat dissipation of a traditional resin encapsulation process are solved, the dustproof, insulating and high-temperature-resistant performances are considered at the same time, and a more efficient and reliable high-temperature electromagnetic coil solution is provided for a control rod driving mechanism of a nuclear power station.

The utility model discloses an electromagnetic coil winding device, which belongs to the technical field of winding equipment and comprises a fixed table and a movable frame, a tensioning and positioning mechanism is arranged on the rear side of the top of the fixed table, clamping mechanisms are arranged on two sides of the movable frame, each clamping mechanism comprises a mounting plate, a driving ring, an air cylinder, a connecting ring and a plurality of clamping plates, l-shaped plates are fixedly installed on the sides, away from each other, of the multiple clamping plates, inclined rods are fixedly installed at the other ends of the L-shaped plates, a plurality of inclined holes are formed in one side of the connecting ring, the inclined rods are slidably installed in the corresponding inclined holes, an annular rail is fixedly installed on one side of the connecting ring, and the annular rail is fixedly installed on the other side of the connecting ring. And a plurality of connecting rods are fixedly mounted on one side of the driving ring. The two ends of the coil framework can be clamped and fixed in multiple directions through the two clamping mechanisms, the clamping and fixing stability is guaranteed, the coil framework is prevented from inclining in the winding process, and the winding uniformity is guaranteed.

The application provides a one-time forming electron beam welding method for a titanium alloy component with single-sided incidence and double-layer welds, which comprises the following steps: a closed cavity structure titanium alloy component is formed by a plurality of mutually shielded multi-layer thin plates through single-direction electron beam incidence; the focusing current of the electron beam is adjusted; the converging effect of the electromagnetic coil is changed to change the focus position, and then the electron beam keyhole depth and size are changed; the keyhole is adjusted to be an energy channel through which the electron beam passes; the electron beam energy can pass through the first layer of welds to reach the second layer of welds; the controllable linear energy is provided by combining the acceleration voltage, the welding current and the welding speed to ensure that the remaining energy that penetrates reaches the second layer of welds to complete the welding of the second layer of welds again; the low-frequency scanning is combined with the electron beam movement to drive the first layer of molten pool metal to flow and fill the rear channel, and the front channel is opened, so that the channel is dynamically smooth and stable, and the electron beam keyhole effect behavior is adjusted.

The invention belongs to the technical field of offshore wind power, and particularly discloses a floating type fan foundation platform capable of absorbing wave flow energy, which comprises a middle buoy and a plurality of outer buoys annularly distributed on the peripheral side of the middle buoy, and the outer buoys are fixedly connected with the middle buoy through connecting beams; each buoy is movably connected with an energy absorption bracket, and the energy absorption bracket comprises a middle sleeve arranged on the middle buoy in a sleeving manner, an outer sleeve arranged on the outer buoy in a sleeving manner, and a supporting rib plate fixedly connected with the middle sleeve and the outer sleeve; an electromagnetic coil is sealed in the outer sleeve, a permanent magnet is fixed in the outer buoy, and the electromagnetic coil and the permanent magnet are matched to be used for converting reciprocating motion kinetic energy of the energy absorption support into electric energy; the energy-absorbing buoy sleeves the periphery of the middle buoy and is positioned at the bottom of the energy-absorbing bracket; and the energy-absorbing buoy is used for driving the energy-absorbing bracket to reciprocate along the axial direction of the middle buoy. The stability of the platform in a complex marine environment is remarkably improved, the influence of vortex-induced vibration and large-amplitude motion on the draught fan is reduced, wave and water flow energy can be recycled, and electric power is generated.

A magneto-rheological damper includes a cylinder including a magneto-rheological fluid with a viscosity that is changeable in accordance with magnetic field application, a piston movable in the cylinder and partitioning the cylinder into first and second compartments, a fluid passage enabling the first compartment and the second compartment to communicate with each other, and an electromagnet including an electromagnetic coil and an iron core pipe. A magnetic field is applicable to the fluid passage by energizing the electromagnetic coil to increase a flow resistance of the magneto-rheological fluid in the fluid passage so that movement resistance is applied to an object connected to the piston. The fluid passage includes: a first fluid passage facing one end portion of the iron core pipe and to which the magnetic field is applied by the electromagnetic coil, and a second fluid passage extending through the iron core pipe.

The invention discloses a carton board printing device, which relates to the technical field of package printing, and comprises a magneto-rheological dynamic impressing assembly, a self-calibration pressure sensing paper guide assembly and a bracket, and the magneto-rheological dynamic impressing assembly is arranged on one side of the outer wall of the bracket; according to the magnetorheological dynamic imprinting assembly, firstly, a laser triangulation range finder and an ultrasonic sensor are used for detecting tiny concave-convex and overall thickness difference of the surface of a paperboard in real time, a partitioned electromagnetic coil in an imprinting roller is driven, the magnetic field intensity is dynamically adjusted by means of the millisecond response characteristic of magnetorheological fluid so as to change the damping characteristic of the magnetorheological fluid in the imprinting roller, and then the paperboard surface is impressed. When the local part of the paperboard is detected to be thicker or bulged, the magnetic field of the electromagnetic coil in the corresponding subarea is weakened, and the magnetorheological fluid is in a low-viscosity state to avoid excessive pressure in the area, and when the local part of the paperboard is detected to be thinner or sunken, the magnetic field of the electromagnetic coil in the corresponding subarea is enhanced, and the magnetorheological fluid is in a high-hardness state to ensure sufficient pressure in the area; therefore, precise pressure compensation of the local area of the paperboard is achieved.

The invention discloses a water-rich broken surrounding rock directional grouting method based on an external magnetic field. The method comprises the following steps that 1, geological exploration is conducted on a target water-rich broken surrounding rock area; step 2, mixing the base material, the nano ferroferric oxide magnetic particles, the rheology regulating agent, the dispersing agent and the coagulation accelerator according to a mass ratio; 3, injecting alternating current with the frequency of 50-500Hz into the electromagnetic coil to generate a rotating magnetic field with the intensity of 3-10kA / m, and driving the slurry to directionally migrate along the main fracture area; 4, the grouting pressure of the pre-buried pressure sensor is monitored in real time, when the pressure change rate delta P / delta t is larger than or equal to 0.1 MPa / min, the electromagnetic coil injection frequency is switched to alternating current of 1 kHz to 10 kHz, so that the intensity of a magnetic field is improved to 8 kA / m to 15 kA / m, and grouting on the micro-crack area is enhanced; and 5, when the pressure change rate delta P / delta t is smaller than + / -0.1 MPa / min and lasts for 5-10 min, grouting operation is ended. The method aims at solving the problems that in grouting reinforcement of the water-rich fractured stratum, slurry is lost along with water flow, micro-cracks are difficult to fill, and reinforcement bodies are distributed unevenly.

The embodiment of the invention discloses an intrinsic frequency on-line adjusting system and method, a parameter adjusting method, equipment and a medium, and the device comprises at least one electromagnetic coil, an electromagnetic coil drive circuit, an optical fiber loop and a light beam processing module. The electromagnetic coil driving circuit is electrically connected with the electromagnetic coil and is used for providing target driving current for the electromagnetic coil so as to change the magnetic field of the electromagnetic coil through the target driving current; the electromagnetic coil is used for adjusting the refractive index of the optical fiber loop through a generated magnetic field; the optical fiber loop penetrates through the at least one electromagnetic coil, and the tail ends of extension branches at the two ends of the optical fiber loop are connected with the light beam processing module and used for maintaining the target eigenfrequency of the target equipment based on the current refractive index. According to the technical scheme provided by the embodiment of the invention, the on-line adjustment of the eigenfrequency of the optical fiber ring can be realized in a full-temperature range, so that the environmental adaptability of equipment is improved.

The invention relates to an electromagnetic coil excitation signal modulation device and method. A control module outputs a PWM signal of a target frequency to a signal adjustment module, and sends a control voltage corresponding to the target frequency to a voltage-controlled adjustable center frequency point band-pass filter; the signal adjusting module receives the output voltage sent by the control module, performs feedback adjustment according to the output voltage and a sampling signal output by the feedback sampling module, and outputs an amplified PWM signal with the same frequency as the PWM signal to the voltage-controlled adjustable center frequency point band-pass filter; the voltage-controlled adjustable center frequency point band-pass filter modulates the amplified PWM signal into a same-frequency sine wave signal according to the control voltage sent by the control module and sends the same-frequency sine wave signal to the power amplification module; and the power amplification module performs power amplification on the same-frequency sine wave signal and outputs an excitation signal to the electromagnetic coil. On-line continuous adjustment of a center frequency point is supported, signal modulation is more accurate, and the use reliability in a complex electromagnetic environment is improved.

The invention relates to the technical field of lithium battery pole piece rolling, and provides a heat-based roller type regulation and control method and system for a lithium battery pole piece roller press. The method comprises the following steps: S1, establishing a roller finite element mechanism model; s2, performing simulation by using a roller finite element mechanism model; s3, performing thermocouple distribution preliminary screening based on the temperature comprehensive contribution degree; s4, redundant preliminary screening thermocouple distribution points are eliminated based on data clustering analysis; s5, determining an optimal thermocouple distribution point combination; s6, constructing a dynamic thermal field matrix; s7, constructing a data driving model; s8, obtaining a joint prediction thermal convexity through joint prediction; and S9, the power of the electromagnetic coil and the edge water cooling flow are adjusted. The system comprises a roller heating device, an edge water cooling device, a temperature sensing network, a control platform, a regulation and control execution unit and a lithium battery pole piece roller press. Through accurate prediction of the thermal crown of the roller, real-time dynamic compensation of the roller shape is realized, and the thickness stability of the pole piece is improved.

The utility model discloses a loading device for researching a material impact sliding coupling wear test, which comprises a top plate and a sliding block, and the sliding block is arranged on the bottom side of the top plate in a sliding manner; the driving assembly is arranged on the top plate and one end is connected with the sliding block to drive the sliding block to slide; the connecting block is arranged on the bottom side of the sliding block, and a groove distributed in the vertical direction is formed in the bottom side of the connecting block. The electromagnetic coil is vertically arranged on the inner wall of the groove; the top end of the impact rod vertically penetrates through the electromagnetic coil and is arranged in the groove in a lifting manner, and the bottom end of the impact rod is used for fixing an experimental material; the base is arranged below the bottom end of the impact rod and is used for abrading an experimental material; the console is arranged on the connecting block. The driving assembly and the electromagnetic coil are connected with the console. The loading device for researching the impact sliding coupling wear test of the material, provided by the utility model, can be used for simultaneously carrying out a sliding wear test and an impact wear test on the experimental material, and brings convenience to the research of the wear test.

The invention relates to a material dynamic mechanical property testing technology, in particular to an impact mechanical loading device and method based on a locked-rotor test of an electromagnetic coil emitter, and the device comprises a pulse power supply module, an electromagnetic loading module, a constraint fixing module and a measurement and control system. Capacitor charging voltage is set through an upper computer, a control switch is switched on to discharge an electromagnetic loading module to generate pulse current, and an electromagnetic coil generates a pulse magnetic field to enable a conductor armature to induce eddy current to generate axial electromagnetic force; the position of the armature is rigidly restrained to form locked rotor, impact electromagnetic force is directly loaded to a sample through an impact head to form impact stress, and dynamic response, fatigue damage and aging accumulation experiments of materials are carried out by monitoring the working performance of a monitoring device such as voltage, current and impact force. The device has the advantages of being small in size, flexible and adjustable in impact stress wavelength and amplitude, high in efficiency and the like, and the problems that a traditional mechanical impact device is large in size, the impact stress pulse width is not easy to regulate and control, and the test efficiency is low are solved.

The invention discloses a pharmaceutical wastewater treatment device. The device comprises a precipitation cylinder, a stirring mechanism and a main control module. The precipitation cylinder is composed of a cylinder body and a cylinder cover, and the stirring mechanism comprises a stirring shaft, an electromagnetic pulse stirring module, a turbine stirring module and a negative pressure aeration module. The stirring shaft penetrates through the shaft hole of the barrel cover and can freely rotate and move up and down in the shaft hole. The electromagnetic pulse stirring module realizes intermittent up-and-down movement of a stirring shaft through an electromagnetic coil and a magnetic chuck to generate a pulse stirring effect; the turbine stirring module forms a vortex by using inclined blades on a turbine when the stirring shaft moves; the negative pressure aeration module realizes unpowered aeration through an aeration wheel and a passive one-way valve, increases dissolved oxygen in wastewater and promotes turbulence. According to the device, a three-dimensional mixing field of gas-liquid mixed turbulent flow is formed in a pulse-vortex-aeration coupled composite stirring mode, so that a flocculating agent and wastewater are quickly and uniformly mixed, and the flocculation reaction efficiency is effectively improved.

The invention provides a magnetic field enhanced SF6 circuit breaker intelligent control method and device. According to the method, waveform feature extraction and spectral analysis are carried out by acquiring arc state parameters, an intelligent decision model is constructed by adopting a hybrid machine learning and reinforcement learning algorithm to generate an optimal arc extinguishing control strategy, and differential control is implemented in different stages of an arc: an electromagnetic coil is activated in the initial stage to generate a high-intensity magnetic field to apply Lorentz force; synergistically adjusting the magnetic field and airflow in the middle stage, and strengthening airflow cooling in the later stage; meanwhile, the medium recovery characteristic is monitored, the reignition probability is calculated in real time, protection measures are triggered, the fault diagnosis function is integrated, intelligent arc extinguishing control over the SF6 circuit breaker is achieved, and the large-current breaking capacity and reliability are remarkably improved.

The invention discloses an infrared induction feedback type permanent magnet magnetic field auxiliary TIG (Tungsten Inert Gas) welding device and a working method thereof, and the device comprises a TIG welding gun arranged above a workpiece, a welding power supply connected with a tungsten electrode in the TIG welding gun, a permanent magnet group arranged above the workpiece, and a magnet driving mechanism for driving the permanent magnet group, the infrared temperature detector is arranged on the side surface of the workpiece; the driving permanent magnet set and the infrared temperature detector are both connected with the control system, the infrared temperature detector detects the arc temperature distribution condition in real time and feeds back the detected arc temperature to the control system, and the control system compares the arc temperature with a preset threshold value and sends a control signal to the magnet driving mechanism according to the comparison result. The magnet driving mechanism adjusts the distance between the two permanent magnets in the permanent magnet group and the electric arc based on the control signal, and dynamic adjustment of the magnetic field intensity is achieved. According to the invention, the size of the magnetic field can be flexibly changed, and high energy consumption and electromagnetic interference of the electromagnetic coil can be avoided.

The invention discloses a circuit breaker device with a fireproof function and a method, and relates to the technical field of circuit breaker fire prevention. The device comprises an insulating shell and an insulating auxiliary shell, the insulating shell and the insulating auxiliary shell are the same in specification, the insulating auxiliary shell is fixedly installed on one side of the insulating shell, a circuit breaker assembly and an active circuit breaking protection assembly which are used for protecting a circuit are arranged in the insulating shell, and the two ends of the insulating shell are each provided with an auxiliary clamping assembly used for limiting a wire. According to the invention, through the arrangement of the active circuit break protection assembly and a dual circuit break mechanism of component conventional short circuit protection and active temperature linkage protection, when the conventional short circuit protection mechanism is not triggered due to a fault, the electromagnetic coil continuously bears large current to generate joule heat, and after the temperature sensor monitors a supercritical temperature, the electromagnetic coil is switched on; a temperature control signal is transmitted to the active circuit breaking protection assembly to trigger the active circuit breaking protection assembly depending on a miniature electric telescopic rod, a lifting block and other structures, a turnover block is driven to turn over, a circuit is forcibly broken, and fire hazards caused by heating due to faults are effectively avoided.

The invention provides a current-sensitive resonance eliminator driven by grounding current, and belongs to the technical field of grounding protection. The current-sensitive resonance eliminator is used for being connected between a neutral point of a voltage transformer of a distribution network system and the ground, and is structurally characterized in that a high-voltage lead, a circuit board, an electromagnetic switch and a low-voltage connecting line are electrically connected in sequence from top to bottom and are arranged in an inner cavity of an insulating sheath, the low-voltage connecting wire is led out from the tail of the electromagnetic switch; the high-voltage lead is connected with a wiring terminal of a neutral point of the voltage transformer The low-voltage wire holder is sleeved at the bottom of the insulating sheath; the low-voltage connecting wire is connected with the grounding end through the low-voltage wire holder; a current-sensitive resistor is arranged in the circuit board; when the zero-sequence current of the neutral point of the system is increased suddenly, the resistance value of the current-sensitive resistor is increased suddenly to reduce the loop current; an electromagnetic coil in the electromagnetic switch is connected with a low-voltage connecting line, the electromagnetic switch is driven to be disconnected when grounding current large enough flows through the electromagnetic coil, and the normally-closed state is automatically recovered after a safe duration.

The invention discloses a driving circuit of a display panel, an array substrate and the display panel, and belongs to the technical field of display. The driving circuit of the display panel comprises a gate driving unit; the electromagnetic coil winds the grid driving unit according to a preset direction; the driving chip is connected with the electromagnetic coil; the temperature detection unit is used for detecting the current temperature of the gate driving unit and outputting a temperature detection signal; and the control unit is respectively connected with the temperature detection unit and the driving chip, and the control unit is used for controlling the driving chip to supply power to the electromagnetic coil according to the temperature detection signal, so that the temperature of the gate driving unit is increased. The grid driving unit is heated through the electromagnetic eddy current effect, compared with a traditional electric heating wire heating scheme, the grid driving unit is more efficient and energy-saving, the low-temperature characteristic of the grid driving unit can be effectively improved, and the phenomenon that low-temperature cross grains are drawn differently on the display panel adopting the grid driving unit is prevented.

The utility model discloses a circuit capable of inhibiting surge voltage between contacts when a relay acts. The circuit comprises a relay, a resistor, a piezoresistor, a diode, a direct current electromagnetic coil and a binding post. When a high-capacity inductive load in a circuit loses power, a relatively high reverse electromotive force, namely a surge voltage, is generated. A resistor-diode series follow current loop and a piezoresistor-diode series surge suppression loop are reversely connected in parallel to the two ends of an inductive load, when the load loses power and generates reverse electromotive force, the follow current loop eliminates or reduces the electromotive force, and the surge suppression loop is conducted and shunted when the electromotive force exceeds a threshold value, so that surge voltage is prevented from being generated through dual protection; and a relay contact and a circuit are protected. The scheme is a passive suppression protection circuit, has the advantages of simple structure, low cost, fast response, recoverability, dual protection and the like, and improves the operation stability and reliability of equipment.