1457 results about "Magnetic loop" patented technology

The invention relates to the technical field of magnetic ring detection, discloses a magnetic ring multi-dimensional nondestructive detection system and method based on multi-frequency composite electromagnetic excitation, and solves the defects of existing magnetic ring detection in the aspects of information acquisition, composite excitation and comprehensive diagnosis. The method comprises the following steps: applying multi-frequency composite excitation, and collecting and preprocessing multi-dimensional response; and extracting features, and carrying out deep learning fusion inversion to obtain magnetic characteristics, material components and defect information. The system comprises a composite excitation module, a multi-mode sensing module, a data acquisition preprocessing module, a data fusion inversion module and a control module. By adopting the technical scheme, comprehensive and efficient nondestructive detection of multi-dimensional electromagnetic information of the magnetic ring is realized, the existing limitation is overcome, and the detection precision and the comprehensive diagnosis capability are remarkably improved.

The invention belongs to the technical field of electric energy meters, and particularly relates to a single-phase electric energy meter with a magnetic ring compensation structure. The device comprises a gap magnetic ring modeling unit, a compensation coil current setting unit, a driving voltage real-time generation unit and a pulse output unit, the notched magnetic ring modeling unit is used for calculating corresponding uncompensated magnetic flux based on the magnetic conductivity after temperature correction; the compensation coil current setting unit is used for forming a compensation coil current setting value; the driving voltage real-time generation unit is used for injecting bidirectional current matched with a compensation coil current set value into the compensation coil; the pulse output unit is used for triggering metering pulse output; the method has the beneficial effects of high precision, high stability, low power consumption and high robustness.

The utility model discloses a cross-shaped winding machine capable of preventing wound wires on a magnetic ring from being scratched. The cross-shaped winding machine comprises a machine frame, a first rotary clamping unit, a second rotary clamping unit, a winding mechanism, a wire hooking mechanism and a material grabbing mechanical arm, wherein the first rotary clamping unit, the second rotary clamping unit, the winding mechanism, the wire hooking mechanism and the material grabbing mechanical arm are installed on the machine frame. The first rotating unit comprises a first thread feeding and trimming mechanism and a first rotating and clamping mechanism; the second rotary clamping unit comprises a second thread feeding and trimming mechanism, a second rotary clamping mechanism and a thread blocking mechanism; the second rotary clamping mechanism comprises a clamping device used for clamping the magnetic ring, an overturning assembly connected with the clamping device and used for driving the magnetic ring to overturn, and a rotating assembly connected with the overturning assembly and used for driving the magnetic ring to rotate. The wire blocking mechanism comprises a wire blocking plate located below the clamping device and a wire blocking driving device used for driving the wire blocking plate to move up and down. According to the utility model, the first wire wound on the magnetic ring can be protected in the winding process, and the first wire is prevented from being scratched by the second wire in the winding process, so that the yield of products is improved.

The utility model discloses a brushless servo motor easy to install and debug, which comprises a shell, a rotor, a stator and an encoder assembly, and is characterized in that the rotor comprises a rotating shaft and a magnetic ring; the shell comprises a shell and a first end cover; the stator comprises a stator core and a winding; the magnetic ring is an M-pole magnetic ring; the encoder assembly comprises a PCB and a magnetic induction device, the magnetic induction device comprises N groups of Hall sensors, and N is 1 or 2; each group of Hall sensors comprises two Hall sensors, and one Hall sensor rotates 90 degrees around the center line of the rotating shaft to reach the position of the other Hall sensor; each Hall sensor is eccentrically arranged relative to the center line of the rotating shaft, and a gap is formed between each Hall sensor and the magnetic ring in the axial direction of the rotating shaft. According to the utility model, the Hall sensor directly senses the magnetic field of the magnetic ring of the rotor to determine the angular position of the rotor, an independent sensing magnet does not need to be arranged on the rotor, the structure is simple, and the installation process is simplified.

The invention provides a multi-magnetic-circuit single-magnetic-ring dual-modulation three-rotor coaxial magnetic gear and an automobile hub motor, the magnetic gear comprises an inner rotor, a T-shaped dual-modulation magnetic ring, an intermediate rotor and an outer rotor, the inner rotor, the T-shaped dual-modulation magnetic ring and the intermediate rotor are nested in sequence and are coaxially configured to form a radial and modulation coaxial magnetic gear structure; the middle rotor, the T-shaped dual-modulation magnetic modulation ring and the outer rotor are sequentially nested and coaxially arranged to form an axial and modulation coaxial magnetic gear structure; and sum modulation is adopted between the inner rotor and the intermediate rotor, sum modulation is adopted between the intermediate rotor and the outer rotor, and the two sum modulation and sum modulation share one T-shaped dual-modulation magnetic modulation ring, so that the monotonic magnetic ring dual-modulation effect is realized. The size of the magnetic gear can be reduced, the torque transmission capacity of the magnetic gear is improved, the magnetic saturation phenomenon is restrained, the magnetic field modulation effect is enhanced, and the torque density of the magnetic gear is improved.

The invention relates to the technical field of settlement monitoring, in particular to embedded type ground settlement monitoring equipment which comprises a settlement pipe, a magnetic ring and a displacement sensor, four sliding grooves are formed in the outer wall of the settlement pipe at equal intervals, sliding blocks are slidably connected to the inner sides of the four sliding grooves, the magnetic ring is slidably connected to the outer wall of the settlement pipe, and the sliding blocks are fixedly connected to the inner side of the magnetic ring. Through the arrangement of the conical block, the insertion rod, the limiting mechanism, the removing mechanism and other structures, in the monitoring equipment installation process, after the periphery of a sedimentation pipe is backfilled, the insertion rod on the magnetic ring is automatically extruded out and inserted into surrounding backfilled soil, then the limiting rod is pushed out of a sliding groove through the removing mechanism, and the magnetic ring can be installed conveniently. And the sliding positions of the limiting rod and the inserting rod are limited, so that the downward sliding limitation of the magnetic ring is relieved, the displacement sensor moves to the side of the magnetic ring, the magnetic ring is quickly mounted, the difficulty in positioning and fixing in the mounting process of the magnetic ring is avoided, and the mounting efficiency is improved.

The invention discloses a novel photovoltaic optimizer based on PLC communication, which comprises a hardware module, a control module, a communication module and a service module, and is characterized in that the hardware module is used for constructing a system material basis and realizing electric energy calling, signal coupling and equipment protection, and the control module is used for realizing intelligent power regulation and communication control; the power generation efficiency is improved and the communication stability is guaranteed through a multi-modal algorithm, and the communication module is used for constructing a power line carrier communication system. A special PLC framework for a direct-current low-voltage environment is adopted, a communication frequency band and an impedance matching scheme can be designed according to photovoltaic direct-current side characteristics, technical field differentiation is formed from alternating-current power grid PLC patents, through dual-mode MPPT dynamic switching, the limitation of a single algorithm in a dynamic environment can be broken through through combination of local gradient prediction and a distributed collaborative algorithm, and the real-time performance of a photovoltaic power grid is improved. In cooperation with a passive impedance compensation technology, adaptive adjustment can be performed through the magnetic ring filter and the capacitor array, an additional power supply module is not needed, and the hardware complexity is reduced.

The utility model provides a power assembly and a converter. The power assembly comprises a machine-side power module, a network-side power module, a positive direct-current bus conducting bar, a negative direct-current bus conducting bar and a direct-current bus capacitor, the machine side power module is connected with a motor, the network side power module is connected with a power grid, and the positive direct current bus conducting bar and the negative direct current bus conducting bar are connected between the machine side power module and the network side power module. The direct current bus capacitor is arranged between the positive direct current bus conducting bar and the negative direct current bus conducting bar; the power assembly further comprises at least one magnetic ring arranged on the positive direct current bus conducting bar and / or the negative direct current bus conducting bar. According to the power assembly and the converter, through the at least one magnetic ring arranged on the positive direct current bus conducting bar and / or the negative direct current bus conducting bar, the ripple current of the bus capacitor is prevented from being too large, the loss of the bus capacitor is reduced, and the bus capacitor is prevented from being burnt.

The invention relates to a winding method of an inductance coil, which comprises the following steps of: fixing a wire rod, hooking the wire rod by a crochet hook, hooking the wire rod by a wire hook, unhooking the crochet hook, lifting the crochet hook and reversely rotating by a certain angle to separate the crochet hook from the wire rod, and continuously rotating a wire hooking disc until one end of the wire rod with a wire end is completely wound on the periphery of the wire hooking disc. Winding: a wire clamping mechanism drives the wire to perform arc-shaped winding action, and the wire is moved to the position above the magnetic ring and crosses an inner hole of the magnetic ring; and the steps are repeated, so that the wire is uniformly wound on the magnetic ring. According to the wire winding method, the wire is wound on the periphery of the wire hooking disc, the size of the wire storage mechanism can be greatly reduced, the wire is in a controlled state in the winding process, the phenomena of winding, knotting and the like are avoided, the tail of the wire cannot float disorderly, and the problem that an insulating layer is scratched can be effectively solved. And a longer wire can be wound by using equipment with a smaller size, so that the space of a plant is saved.

The invention belongs to the technical field of mechanical transmission systems, and particularly discloses a method and a system for calculating, regulating and controlling the vibration isolation rate of a rigidity-variable magnetic torsional vibration buffer, and the method comprises the following steps: obtaining a real-time working condition, modeling a single permanent magnet magnetic field by adopting an equivalent magnetic charge method, and calculating the vibration isolation rate of the rigidity-variable magnetic torsional vibration buffer; a magnetic block negative stiffness model and a spring torsion sheet positive stiffness model of the annular Halbach array are constructed, the total coupling stiffness is calculated, the vibration isolation effect of the magnetic torsional vibration buffer is solved, vibration suppression effects and resonance interval distribution under different working conditions are obtained, and based on the vibration isolation effect of the magnetic torsional vibration buffer, the vibration suppression effect of the magnetic torsional vibration buffer is calculated. The gap adjustable mechanism adjusts the rigidity of the spring torsion sheet and the gap of the magnetic ring in real time. By the adoption of the technical scheme, the gap between the inner magnetic ring and the outer magnetic ring is flexibly set according to multi-working-condition requirements, so that applicability and reliability are improved, and low-frequency torsional vibration is effectively restrained while efficient torque transmission is ensured.

The invention discloses an integrally sintered neodymium iron boron Halbach ring multi-pole rotating excitation magnetic field press which comprises a rack, a base, a die assembly, an upper die servo electric cylinder mechanism, a lower die servo electric cylinder mechanism, an excitation structure and a rotating excitation device. The base is fixedly arranged on the ground or a working platform; the rack is mounted above the base; the die assembly comprises an upper annular male die, a lower annular male die, a non-magnetic steel female die, a magnetic conductive die core and a die base. The excitation structure comprises an excitation frame, an excitation coil, an excitation pole and a magnetic conductive pole shoe; excitation forming of any even number of poles can be carried out by using a mold of the same size, the requirement for multiple pole numbers is met, the equipment investment is reduced, the production cost is reduced, the production period is shortened, the production flexibility and efficiency are improved, the diversified requirements of different clients and application scenes for the Halbach magnet ring are met, and the production efficiency is improved. The problems that an existing magnetic field press is single in forming pole number and uneven in surface magnetic field distribution are solved, and technical conversion and marketization are promoted.

The invention relates to the technical field of electric signal data processing, in particular to a cable life prediction method based on working condition movement. The method comprises the following steps of: sleeving a leakage flux ring on the periphery of a cable shielding layer, wherein a Hall array is arranged in the leakage flux ring; an acoustic emission patch is attached to the surface of the shielding layer; a mechanical trigger is arranged at the joint of the cable drag chain; when the mechanical trigger detects a complete bending stroke every time, the Hall array and the acoustic emission patch are started synchronously, and a magnetic flux leakage pulse amplitude value and an ultrasonic elastic wave energy value of the current stroke number are generated; dividing the magnetic flux leakage pulse amplitude value of the same stroke number by the ultrasonic elastic wave energy value to obtain a broken wire coefficient of the stroke number; and accumulating the broken wire coefficients of the continuous stroke numbers of the cable to form a theoretical accumulated broken wire index. According to the invention, through the magnetic flux leakage and acoustic emission monitoring technology and in combination with the accelerated bending test, accurate quantification and life prediction of the broken wire state of the cable are realized, and finally, the reliability of the whole life cycle management of the cable is improved.

The present invention relates to the technical field of encoders, and particularly to a high-performance magnetic ring encoder and a method for detecting the absolute angle of the magnetic ring encoder. The high-performance magnetic ring encoder includes a second multi-pole magnet, a first multi-pole magnet, a single-pole magnetic conductor assembly, a first group of Hall elements, a second group of Hall elements, and a third group of Hall elements; the single-pole magnetic conductor assembly has a toothed portion and a smooth portion, the first group of Hall elements and the second group of Hall elements are respectively arranged adjacent to the first multi-pole magnet and the second multi-pole magnet, the third group of Hall elements is arranged between the toothed portion and the smooth portion, and the three groups of Hall elements output corresponding detection signals according to the pole signals of the corresponding magnets. The present invention calibrates the rotation angle of the magnetic ring encoder by obtaining a mechanical angle with a certain accuracy, thereby greatly improving the measurement accuracy. The present invention is particularly suitable for meeting the actual requirements of angle detection of large-diameter shaft parts.

The utility model belongs to the technical field of magnetizing, and discloses a multi-pole magnetic ring magnetizing device which is characterized in that a rotating plate is rotatably connected to a first supporting plate around the central axis of the rotating plate; the fixed plate is fixedly connected to the first supporting plate and stacked on the rotating plate. The multiple positioning magnetizing structures are distributed at intervals and are all slidably connected to the fixing plate. And the positioning magnetizing structure can magnetize the multi-pole magnetic ring. The rotating plate is configured to drive the multiple positioning magnetizing structures to be synchronously close to or away from each other when rotating around the central axis of the rotating plate. And when the plurality of positioning magnetizing structures are close to each other, the multi-pole magnetic ring can be clamped among the plurality of positioning magnetizing structures and is supported on the fixed plate or the rotating plate. The multi-pole magnetic ring can be accurately rotated to an optimal magnetizing state, so that a plurality of magnetic poles of the multi-pole magnetic ring are accurately in one-to-one correspondence with the distribution positions of a plurality of positioning magnetizing structures, and each magnetic pole of the multi-pole magnetic ring can be accurately magnetized. And the working performance of the multi-pole magnetic ring magnetizing device is effectively improved.

The utility model relates to switch rail longitudinal displacement monitoring equipment which comprises a stock rail device arranged on a stock rail and composed of a rear-end clamp, a stock rail front-end clamp, a small-aperture base plate, a large-aperture base plate, a magnetostrictive sensor, a bolt, a cotter pin and the like; the switch rail device is arranged at the heel end of the switch rail and is composed of a rear end clamp, a switch rail front end clamp, a switch rail clamp base plate, a magnetic ring and the like. The high-precision measurement of the longitudinal displacement of the switch rail is realized by measuring the relative position of the magnetic ring and the measuring rod of the magnetostrictive sensor. The switch rail longitudinal displacement measuring device does not need to be driven by big data, can realize high-efficiency and high-precision measurement of switch rail longitudinal displacement under different environmental conditions, and meets the requirements of low-cost, high-stability and high-precision railway field monitoring.

The invention discloses a device for detecting the leakage current of a post insulator in a switch cabinet and an evaluation method thereof, and relates to the technical field of on-line monitoring of power equipment, the device comprises a TMR sensor, a magnetic ring with an air gap, a signal conditioning module and a microprocessor, the TMR sensor is arranged in the air gap, and the magnetic ring detachably sleeves the post insulator in the switch cabinet; the TMR sensor is used for collecting a magnetic signal caused by the leakage current of the post insulator and transmitting the magnetic signal to the signal conditioning module. The signal conditioning module is used for processing the magnetic signal and sending the processed magnetic signal to the microprocessor; and the microprocessor is used for analyzing the processed magnetic signals and determining multi-dimensional parameters of the leakage current. In the method, the operation state of the post insulator is evaluated by using the multi-dimensional parameters of the leakage current, so that the sensing capability of a weak magnetic field can be greatly improved, and the operation state of the post insulator can be accurately evaluated.

The invention relates to the technical field of power cables, and discloses a parallel power cable current sharing optimization method and device based on a magnetic ring current equalizer, and the method comprises the steps: carrying out the simulation of a three-dimensional finite element model, and determining first simulation impedance; obtaining an equivalent circuit model, determining theoretical impedance according to the equivalent circuit model, and determining current impedance according to the theoretical impedance and the first simulation impedance; obtaining an electromagnetic field coupling model, determining a magnetic ring compensation parameter, and simulating the electromagnetic field coupling model according to the magnetic ring compensation parameter and the current impedance to determine an impedance compensation mapping relation; and determining an impedance compensation sensitivity matrix according to the impedance compensation mapping relation, and setting values of magnetic ring compensation parameters so as to perform current sharing optimization on the parallel power cables. According to the invention, the mapping relation between the magnetic ring compensation parameter and impedance compensation of the magnetic ring current equalizer can be quantified, thereby accurately generating an optimal compensation scheme, greatly improving the reliability of the parallel power cable, and facilitating the realization of power transmission safety.

The invention relates to a coaxial line transformer-based power synthesis circuit and synthesizer, which comprises an impedance reducing sub-circuit and an impedance increasing conversion sub-circuit, and is characterized in that the output end of the impedance reducing sub-circuit is connected with the input end of the impedance increasing conversion sub-circuit; the input end of the impedance reducing sub-circuit is constructed as the input end of the power synthesis circuit, and the output end of the impedance increasing conversion sub-circuit is constructed as the output end of the power synthesis circuit; the impedance reducing sub-circuit and the impedance increasing conversion sub-circuit comprise coaxial line magnet ring transformers, coaxial lines penetrate through magnet rings to form the coaxial line magnet ring transformers, inner conductors of the coaxial lines serve as primary coils of the transformers, and outer conductors of the coaxial lines serve as secondary coils of the transformers. The impedance reduction sub-circuit is used for performing power synthesis and impedance reduction through the turn ratio of the coaxial line magnet ring transformer, and the impedance rising conversion sub-circuit is used for impedance matching and power transmission optimization so as to convert a medium-low impedance value back to a standard impedance value required by a load and ensure that the maximum power is transmitted to the load.

The invention discloses an electric drill motor overload protection device, and relates to the technical field of circuit overload protection, the electric drill motor overload protection device comprises an electric drill main body, the side part of the electric drill main body is provided with a driving module, the electric drill main body is internally provided with an overload assembly, the overload assembly comprises a hard through pipe and an elastic through pipe, and the hard through pipe and the elastic through pipe are internally provided with connecting wires in a penetrating manner; composite connecting pieces are assembled outside the sides, close to each other, of the two connecting rods; the whole composite connecting piece is of a double-layer structure, the inner layer is an electrified contact head used for achieving circuit conduction, the outer layer is an adsorption magnetic ring playing a role in adsorption and fixation, thermal expansion of the heat sensitive piece is a continuous process, but the action of triggering the upper inclined plate to move to disconnect the circuit is completed instantly, and therefore the heat sensitive piece is not damaged. The delayed process of temperature accumulation is converted into the instant action of mechanical triggering, so that the response of the protection device is quicker and more reliable, timely intervention can be performed when the temperature of the motor just exceeds the safety range, and the operation time of the motor at the dangerous temperature is effectively shortened.

The invention relates to the field of dam deformation monitoring, and discloses a dam deformation monitoring device based on a settlement magnetic ring and an MEMS accelerometer, and the device comprises an inclinometer pipe which is buried in a dam body drill hole and is used for synchronously deforming along with a dam body; the flexible intelligent displacement meter is formed by connecting a plurality of single-section flexible displacement meters in series through flexible joints, an MEMS accelerometer and a microprocessor are arranged in a side wall slot of each single-section flexible displacement meter, and the MEMS accelerometer and the microprocessor are used for measuring the inclination angle of each section; the settlement magnetic ring synchronously moves along with the settlement of the dam body; the magnetic probe detects the elevation change of the settlement magnetic ring; and after the data acquisition equipment receives the measured data, the data processing center calculates the horizontal displacement and settlement of the dam body. According to the invention, the flexible displacement meter is combined with the settlement magnetic ring to obtain the three-dimensional coordinates of each single section, so that the horizontal displacement and settlement of the dam body are calculated, the deformation of the dam body is monitored under the condition that the flexible displacement meter is only vertically mounted, the limitation of an embedding mode is overcome, and the adaptability and practicability of monitoring are improved.

The embodiment of the invention provides a power conversion device, and relates to the technical field of power supplies, the power conversion device is used for power conversion between direct current and alternating current, the power conversion device comprises a device shell, a circuit board and a power inductor, the device shell comprises a top cover and a bottom shell which are fixedly connected, and the top cover and the bottom shell define a containing cavity; the circuit board is located in the containing cavity. The power inductor is located in the containing cavity and fixed between the circuit board and the bottom shell. The power inductor comprises an installation base, a magnetic core, a magnetic ring, a first winding and a second winding. The mounting seat is fixed on the circuit board, the magnetic core and the magnetic ring are both fixed on the mounting seat, the first winding and the second winding are both wound on the magnetic core, one pin of the first winding and one pin of the second winding both penetrate through the magnetic ring, and at least one pin of the first winding and at least one pin of the second winding are both connected with the circuit board. According to the technical scheme, unified installation of the inductor and the magnetic ring is facilitated, installation procedures are reduced, and the risk that the magnetic ring is damaged is also reduced.

The present invention discloses a magnetic ring with a curved surface and a manufacturing process thereof, which belongs to the field of soft magnetic material production technology, and comprises the following steps: first preparing a preset amount of FeSiCr alloy powder; then, using ball milling to flatten it; then, performing surface phosphating on it; after it is fully dried, passivating it, and then, insulating and coating the material after secondary acidification; and then, after respectively pressing and forming, curing treatment and auxiliary processing, a magnetic ring product with a curved surface can be obtained. The stoichiometric ratio of the core molecular formula of this magnetic ring product is a mass percentage, wherein Fe is 87.80-91.75, Si is 3.65-8.20, and Cr is 4-5.55, and the sum of the percentages of the above three components is 100. The present invention solves the technical problem of large high-frequency loss of magnetic ring products in the prior art.

The utility model relates to the technical field of settlement monitoring equipment, and discloses a railroad bed layered settlement monitoring device which comprises a plurality of protection pipes and a lifting conical block, sleeves are installed on the outer sides of the protection pipes in a penetrating mode, magnetic rings are installed on the outer sides of the sleeves in a penetrating mode, and installation rings are arranged in the protection pipes. A plurality of connecting blocks are fixedly connected between the mounting ring and the magnetic ring, and inserting plates are movably mounted between the mounting ring and the connecting blocks and between the mounting ring and the magnetic ring. The installation sleeve is inserted into the outer side of the protection pipe in a penetrating mode, the installation ring at the same horizontal position as the magnetic ring is installed in the protection pipe through cooperation of the multiple connecting blocks, and therefore the multiple insertion plates can be installed among the magnetic ring, the installation ring and the connecting blocks in a penetrating mode; one end of the inserting plate is inserted into an original soil layer on the inner side of a drill hole, the contact area with the soil layer and anchoring force can be increased, the magnetic ring can deform along with the soil layer more tightly, slippage lag is reduced, and therefore the data accuracy is improved.

The invention discloses a half-open type thrust magnetic levitation bearing. The bearing comprises a first magnetic ring, a second magnetic ring and a third magnetic ring, wherein the first magnetic ring, the second magnetic ring and the third magnetic ring are arranged in annular and laminating manners so as to form an annular magnetic pole; the magnetic pole of each of the magnetic rings is different from that of the adjacent magnetic ring; a first winding and a second winding of the annular magnetic pole are wound according to a predetermined half-open way, the lower part of the middle magnetic pole is recessed inwards so as to generate a winding space which meets predetermined conditions; and the magnetic pole arranged at the upper end extends, and thus, a complete circle of magnetic pole is formed after splicing. Based on the bearing, continuity and consistency of magnetic field strength of the magnetic poles of the half-opened axial thrust bearing can be basically reserved, and the half-open type thrust magnetic levitation bearing can be applied to high-speed rotation machines; and moreover, a more flexible mounting way can be obtained, particularly to large-size rotation machines.

The utility model discloses fan dispensing inspection and magnetic ring assembly equipment which comprises a control module and a lower rack, the pushing mechanism, the dispensing mechanism, the visual camera inspection mechanism, the module carrying mechanism, the grabbing and moving mechanism, the tape clip automatic push-out mechanism, the automatic tape winding mechanism, the tape assembling and pressing mechanism, the discharging mechanism and the control module are in circuit connection with the control module. The visual camera inspection mechanism is used for detecting the dispensing condition and feeding back the dispensing condition to the control module, so that the production efficiency is greatly improved and the reject ratio is reduced; the equipment adopts an automatic assembly operation mode, so that the assembly precision is greatly improved, the dynamic balance is very stable, the noise of the cooling fan in the rotating process is reduced, and the service life is also greatly prolonged; by replacing the positioning carriers of the products, the products of various specifications can be compatible at the same time, and the products are convenient and fast to replace and produce; the labor is reduced, the yield is increased, and the product quality is improved.

The invention discloses a porcelain insulator zero value rapid detection method and device based on impulse current characteristics. The method comprises the steps that high-voltage pulses are applied to the two ends of a to-be-detected porcelain insulator; an impact current signal in an insulator loop is sensed by using a magnetic ring, and the impact current signal is converted into an integral voltage signal through an integral circuit; the integral voltage signal is compared with a preset threshold value, if the integral voltage signal is higher than the preset threshold value, it is judged that the insulator is a zero-value insulator with the internal breakdown defect, and the preset threshold value is predetermined according to the given multiple of the integral voltage measured by a normal insulator under the same condition. By detecting the integral voltage signal of the breakdown current, misjudgment and missed judgment caused by different surface states or internal defect types of the insulator are effectively avoided, the detection accuracy and reliability are improved, and a new effective means is provided for rapid detection of the porcelain insulator.

The invention relates to a large-negative-stiffness magnetic spring device for heavy-load low-frequency vibration suppression. The large-negative-stiffness magnetic spring device comprises an inner magnetic ring pile structure and an outer magnetic ring pile. The inner magnetic ring pile structure can reciprocate in the hollow part of the outer magnetic ring pile; the inner magnetic ring pile structure comprises an upper magnetic ring pile and a lower magnetic ring pile; the upper magnetic ring pile and the lower magnetic ring pile respectively comprise a plurality of inner magnetic rings which are coaxially arranged; the outer magnetic ring pile comprises a plurality of outer magnetic rings which are coaxially arranged; in the axial direction of the inner magnetic ring pile structure, the inner magnetic ring pile structure is provided with a first symmetry plane, and the magnetization directions of the inner magnetic rings of the upper magnetic ring pile and the lower magnetic ring pile are symmetrical about the first symmetry plane; in the axial direction of the outer magnetic ring pile, the outer magnetic ring pile is provided with a second symmetry plane, and the magnetization direction of outer magnetic rings in the outer magnetic ring pile is symmetrical about the second symmetry plane; when the first symmetry plane and the second symmetry plane coincide, the resultant magnetic force between the inner magnetic ring pile structure and the outer magnetic ring pile structure is zero, and the maximum negative stiffness is generated. According to the scheme, the low-frequency vibration is effectively suppressed.

The invention provides an energy-saving building curtain wall waterproof heat preservation outer wall structure, belongs to the technical field of building outer walls, and solves the technical problems that an existing outer wall is wide in solar radiation area and long in time, resource waste is caused when the existing outer wall is not used, and the outer wall is mildewed and peeled off due to water seepage caused by gap expansion in rainy days. The waterproof heat-preservation outer wall structure of the energy-saving building curtain wall comprises a wall body part, a ventilation cavity is formed in the wall body part, the upper end and the lower end of the ventilation cavity communicate with ventilation holes, the upper portions and the lower portions of the ventilation holes communicate with slope water retaining covers, two pieces of angle steel distributed front and back are fixed to the slope water retaining covers, and a heat conduction plate is detachably connected between the two pieces of angle steel; a first magnetic ring is fixed on the temperature conducting plate, a second magnetic ring is magnetically connected to the first magnetic ring, and a flexible photovoltaic film is clamped between the first magnetic ring and the second magnetic ring. The device has the advantages that rainwater is prevented from entering the ventilation holes, and meanwhile solar energy on sunny days is received and converted into electric energy to be used by buildings.

The utility model discloses an electromagnetic relay and a power utilization device. The electromagnetic relay comprises a static contact assembly provided with a static contact, a movable spring assembly, a first magnetic conductive piece and a second magnetic conductive piece. The movable spring assembly comprises a movable spring body and a movable contact arranged on the movable spring body; one end of the movable spring body is a fixed end, and the other end is a movable end; and the movable contact can be in contact with or separated from the static contact. The first magnetic conducting piece is fixedly connected with the insulating structure and is located in a magnetic field corresponding to the part, used for current circulation, of the movable spring body; the second magnetic conducting piece is fixedly connected to the side, away from the static contact, of the movable spring body, the second magnetic conducting piece and the first magnetic conducting piece are oppositely arranged, and when the movable contact and the static contact are closed and conducted, the first magnetic conducting piece and the second magnetic conducting piece form a closed magnetic loop based on current flowing in the movable spring body and generate electromagnetic attraction force; and the movable contact and the static contact are driven to resist the electric repulsive force and keep a closed conduction state. The relay provided by the embodiment of the utility model has the advantages of excellent short-circuit resistance, low consumption of copper consumables and low cost.

The invention provides a magnetic loop assembly matched with a thin voice coil, which is used for combining a vibrating diaphragm and the thin voice coil, the thin voice coil is combined with the vibrating diaphragm, and the magnetic loop assembly comprises a magnetic conductive yoke, an auxiliary magnet, a main magnet unit and an outer magnetic conductive plate, the auxiliary magnet is arranged on the magnetic conductive yoke, and the magnetic conductive yoke protrudes out of the lateral periphery of the auxiliary magnet. The main magnet unit is arranged on the auxiliary magnet, and the auxiliary magnet protrudes out of the lateral periphery of the main magnet unit and is provided with an annular flange. The outer magnetic conductive plate is arranged between the magnetic conductive yoke and the vibrating diaphragm, the top of the main magnet unit, the thin voice coil and the outer magnetic conductive plate correspond to each other in the horizontal position, and the thin voice coil is movably arranged among the main magnet unit, the outer magnetic conductive plate and the magnetic conductive yoke and movably arranged above the annular flange. Therefore, the volume of the magnetic loop assembly can be increased to generate higher magnetic field induction intensity, and the efficiency, the tone quality and the volume of the loudspeaker are further improved.