292 results about "Magnetic switch" patented technology

According to the megawatt-level half-cycle power generator based on the magnetic pulse compression system, by designing the constant-current magnetic switch reset circuit and the PID voltage stabilization charging technology, the pulse jitter characteristic within 10 ns can be achieved on the premise that megawatt-level power is output, the control precision is greatly improved, and stable output of high-power pulses is achieved. The problem that pulse generated by a traditional magnetic pulse compression amplifier is large in delay jitter is solved, high-precision output of megawatt-level pulses can be achieved, the high-precision magnetic pulse compression amplifier can be applied to a high-power transmitter needing to accurately control pulse output time, the high switching frequency and high switching efficiency of an MOS tube and the pulse compression characteristic of a magnetic switch are combined, and the high-precision magnetic pulse compression amplifier is achieved. The magnetic pulse power source has the advantages of high output power and high efficiency, improves the amplitude and phase stability of the output pulse compared with the traditional magnetic pulse power source, and expands the application scene and platform.

The application discloses a kind of excitation control circuit with multiple de-excitation loop for aviation three-stage power generation system, including: resonant de-excitation capacitor C2, de-excitation switch S1, de-excitation switch S2, anti-reverse diode D1, freewheeling diode D2, freewheeling diode D3, transient voltage suppression diode D4, voltage regulating MOS tube Q1, voltage regulating MOS tube Q2, de-excitation resistor R1 and excitation winding L;Wherein, the positive terminal of DC power supply DC+ is connected to the anode of anti-reverse diode D1, the cathode of anti-reverse diode D1 is sequentially connected to the negative terminal of DC power supply DC- by de-excitation switch S1 and resonant de-excitation capacitor C2;The cathode of anti-reverse diode D1 is respectively connected to the drain of voltage regulating MOS tube Q1, the negative electrode of freewheeling diode D3 and one end of de-excitation switch S2, the source of voltage regulating MOS tube Q1 is respectively connected to the positive electrode F+ of excitation winding L, the negative electrode of freewheeling diode D2;The anode of freewheeling diode D3 is respectively connected to the negative electrode F- of excitation winding L, the drain of voltage regulating MOS tube Q2 and the negative electrode of transient voltage suppression diode D4, the other end of de-excitation switch S2 is respectively connected to the positive electrode of transient voltage suppression diode D4 and one end of de-excitation resistor R1;The anode of freewheeling diode D2, the source of voltage regulating MOS tube Q2 and the other end of de-excitation resistor R1 are respectively connected to the negative terminal of DC power supply DC-.The technical scheme of the application solves the problem that the freewheeling diode added between excitation voltages in the existing excitation circuit cannot consume the energy of magnetic field, and the de-excitation speed is slow.

The invention provides a high-performance integrated electric actuator, and belongs to the technical field of automatic control. The motor drives the ball screw assembly to rotate through the transmission mechanism. The ball screw assembly is fixedly connected with the piston rod; the piston and the piston rod are assembled and then arranged in the main body cylinder barrel to do linear reciprocating motion; a self-lubricating structure is arranged on the inner wall of the main body cylinder barrel; a piston rod is rigidly connected with a nut of the ball screw assembly, a rod body penetrates through a guide sleeve at the front end of the body, and the front end of the piston rod is connected with a transmission load through a socket. A guide sleeve made of a thermal compensation material is arranged at the guide part of the piston rod; the magnetic switch is fixed outside the main body through a mounting groove or a screw and is aligned with the magnetic ring on the piston rod; the magnetic ring is embedded into the piston rod; and the anti-vibration supporting ring and the wear-resistant ring are arranged at the supporting part of the ball screw assembly. Stepless and multi-point positioning in a range can be realized according to working requirements, and multi-point free positioning is ensured.

An electromagnetic-actuator (EA) including a coil-element (CE) having a coil-core (CC) / coil arranged about the CC-circumference. The CC has a symmetrical first-region (FR) having an axis-of-symmetry (AOS), the CC being surrounded by the coil, and a movable-magnetic-armature-body (MM AB) as a movable-actuator-element (MAE) interacts with the CE to produce an AB activation-movement, and is supported in the actuator by a bearing-device (BD) and movable from a first / second-position by activating the CE. The BD is radially-offset to the CC AOS, and the AB extends from the BD radially over the CC from a first / second-side of the CC, which has a second-region (SR) extending radially beyond the FR and is on second-side (SS) of the CC between the coil / AB in the direction of AOS such that an air-gap between CC / AB in direction of the AOS is smaller on the SS of the CC than on first-side when the AB is in first-position.

The invention belongs to the field of aircraft missile pylon ejection system control, and particularly relates to a switch array pilot aircraft missile pylon ejection valve and a control method. The ejection valve comprises a flow valve and a pilot stage for controlling the flow valve, and the pilot stage forms a hydraulic half-bridge through a plurality of electromagnetic switch valves connected in parallel, a fixed damping hole and a switch type damping valve controlled by pressure difference. During working, when the electromagnetic switch valve is fully closed, the switch type damping valve is normally opened, and the flow valve is closed; any electromagnetic switch valve is opened, the switch type damping valve is closed under the action of differential pressure, and the flow valve is rapidly opened to supply oil. The redundant design that the multiple electromagnetic switch valves are connected in parallel is adopted, a traditional single pilot electromagnetic valve low in reliability is replaced, normal work under the condition that the single electromagnetic switch valve breaks down can be achieved, and the overall reliability of the system is remarkably improved. During ejection work, the drift diameter of the switch type damping valve is decreased under the action of differential pressure, it is guaranteed that a valve element of the flow valve is rapidly opened, and the response speed of the ejection valve is increased.

The utility model discloses a permanent magnet switch over-travel adjusting structure and device. The permanent magnet switch over-travel adjusting structure comprises a permanent magnet switch body, an over-travel adjusting piece and an over-travel locking assembly. The permanent magnet switch main body comprises a contact spring, an insulating pull rod, a screw rod and an iron core, the contact spring is installed in the insulating pull rod, the lower end of the insulating pull rod is provided with a first inner threaded hole matched with the screw rod, the lower end of the insulating pull rod is connected with the upper end of the screw rod through the first inner threaded hole, and the over-travel adjusting piece is provided with an inner threaded through hole matched with the screw rod. The lower end of the screw rod sequentially penetrates through the internal thread through hole and the iron core and is in threaded connection with the over-travel locking assembly; the lower end face of the over-travel adjusting piece and the upper end face of the over-travel locking assembly abut against the iron core, the scientific principle that the contact spring and the over-travel adjusting piece are spatially separated can be achieved, and therefore the over-travel adjusting device can be directly applied to a high-speed switch under the condition that no part needs to be additionally arranged, and the over-travel adjusting range is effectively enlarged.

The invention discloses an overheating protection function. The overheating protection function comprises the following steps that a protection module is powered on and initialized; recording the initial voltage, and starting timing for continuous working time; the temperature acquisition module judges whether the current temperature of the temperature acquisition point is lower than a preset power-on threshold value or not; if not, the relay is disconnected, and the starter stops working; if yes, the protector controls the relay to be switched on, and the electromagnetic switch is turned on; in the continuous power-on process of the relay, the temperature acquisition module continuously monitors the current temperature of the temperature acquisition point; the protector parallelly executes the following judgment: (1) whether the continuous working time reaches a preset delay protection threshold value or not; (2) judging whether the current temperature reaches or exceeds a preset protection threshold value; and if any one of (1) and (2) is established, the protector controls the relay to be powered off so as to stop the starter from working. Through cooperation of the protector and the temperature sensor, dual and intelligent monitoring and protection of the temperature and the working time of the starter are achieved.

This system ensures that power supply to the vehicle can continue even when the power source switches from the grid to the vehicle. [Solution] The controller, when power is being supplied from the grid power supply (YES in S150) and a power supply request is received (YES in S152), performs the following steps: start supplying power from the vehicle (S154); check the vehicle power supply voltage (S156); if the vehicle power supply voltage is greater than a threshold Va (YES in S158), turn off the first electromagnetic switch and turn on the second electromagnetic switch (S160); and if the vehicle power supply voltage is less than or equal to a threshold Va (NO in S158), maintain the off state of the second electromagnetic switch (S162).

The embodiment of the invention provides a unit excitation de-excitation system and method, and the system comprises a controller which is used for controlling the trigger angle of a three-phase full-control bridge to be switched from a rectification state to an inversion state during normal shutdown so as to achieve inversion de-excitation, and recognizing a fault signal and triggering a de-excitation switch during accidental shutdown; the three-phase full-control bridge is electrically connected to an excitation winding of the generator and is configured to provide rectification or inversion voltage under the control of the controller; the field suppression switch is connected in series in the excitation loop and is configured to respond to a signal of the controller to disconnect the excitation loop during accidental shutdown; the non-linear resistor is connected to the excitation winding in parallel and is configured to absorb residual energy in the rotor when the field suppression switch is switched off; and the protection device is configured to monitor the excitation current and voltage in real time and trigger a protection action when an abnormality is detected. Energy waste of traditional resistor de-excitation is avoided, reliable de-excitation can still be ensured under the extreme fault condition, and the rotor is prevented from being damaged due to overheating.

The invention belongs to the field of vehicle switch control, and provides a self-learning protection electromagnetic main switch for a vehicle and a control method thereof, and the self-learning protection electromagnetic main switch comprises an electromagnetic main switch body and a control circuit connected with the electromagnetic main switch body. The control circuit comprises an input detection module and a voltage comparison module. The input detection module is connected with a current sensor of the electromagnetic main switch and the seat pressure switch. And the voltage comparison module is respectively connected with a power supply and an output driver of the control circuit so as to monitor a comparison result between the input power supply voltage and the standard under-voltage value and between the output power supply voltage and the standard under-voltage value. When the vehicle runs or is parked for a long time, the actual working states of the vehicle and a driver are judged by collecting power supply current, a control switch, an ignition switch, a starting signal, an engine revolution signal, a whole vehicle voltage signal, a driver off-seat signal and the like; the electromagnetic switch coil is controlled to keep a pull-in state, and power supply of a vehicle main circuit is guaranteed.

The utility model discloses an electromagnetic switch spin riveting positioning tool and spin riveting equipment, the positioning tool comprises a first positioning assembly, a second positioning assembly and a slide block jacking assembly, the first positioning assembly comprises a slide block and a slide block positioning seat, the slide block positioning seat is provided with a first placing groove matched with the slide block in appearance, and the slide block jacking assembly is provided with a second placing groove matched with the slide block in appearance; the sliding block is slidably arranged in the first placing groove and forms a second placing groove for placing the movable iron core of the electromagnetic switch, and the second placing groove is matched with the movable iron core in shape; the second positioning assembly is arranged at the top of the sliding block positioning seat, a third placing groove for placing an electromagnetic switch body is formed in the second positioning assembly, and the third placing groove is matched with the body in shape and is communicated with the first placing groove; the sliding block jacking assembly abuts against the bottom of the sliding block, and the sliding block jacking assembly can drive the sliding block to move towards the second positioning assembly along the first containing groove under the action of external force so that the movable iron core can make contact with the electromagnetic switch body.

The utility model relates to the technical field of electromagnetic switches, and discloses an automobile starter electromagnetic switch based on new material application, which comprises a shell, two anti-magnetic interference shells are rotatably connected outside the shell, connecting mechanisms are arranged outside the two anti-magnetic interference shells, and the connecting mechanisms are used for opening and closing the two anti-magnetic interference shells. The device comprises a shell, the upper end and the lower end of the shell are fixedly connected with mounting seats, the opposite sides of the two mounting seats are slidably connected with connecting wires, clamping mechanisms are arranged in the two mounting seats, and the clamping mechanisms are used for stably connecting the two connecting wires into the two mounting seats. According to the utility model, the electromagnetic switch is subjected to external magnetic interference during operation, and the two anti-magnetic interference shells which can be rotatably closed are arranged on the outer side of the shell, so that the service life of the electromagnetic switch is prolonged by closing the two anti-magnetic interference shells during normal operation of the device, the use cost of the device is reduced, and the practicability of the device is improved.

The application discloses a kind of mine drilling rig automation upgrading device and working method, belong to mechanical equipment field, the device includes main support frame (1), mobile frame structure (2), drill pipe gripper (3), drill pipe holder (4), water braid (5), electromagnetic switch valve (6), drill pipe storehouse (7), control system (8), joystick executor (9), main support frame (1) is fixedly installed on the support frame of drilling rig propeller, mobile frame structure (2) is arranged in main support frame (1) upper portion with two degrees of freedom, drill pipe gripper (3) is placed on mobile frame structure (2), drill pipe holder (4) is fixedly connected with drilling rig main shaft, water braid (5) is arranged at the tail end of drilling rig main shaft, electromagnetic switch valve (6) is arranged between water braid (5) and water pipe, drill pipe storehouse (7) is placed on main support frame (1), for storing drill pipe, joystick executor (9) is used to drive joystick action, the device realizes the automation of drilling rig drilling, by installing such a set of drilling rig automation upgrading device on existing manual drilling rig, the automation, intelligent transformation to existing manual drilling rig can be realized.

The present disclosure belongs to the technical field of keyboard keys, and a magnetic switch key is provided. The magnetic switch key comprises a shell and a movable shaft. A perforating hole is formed in a top wall of the shell. The movable shaft is inserted into the perforating hole to be capable of reciprocating motion. The magnetic switch key is more reasonable in magnet layout. The movable magnet can drive the movable shaft to reset in absence of external force. A paragraph hand feeling or linear hand feeling can be realized through the height adjustment of the magnets, so that the using comfort feeling is greatly promoted.

A rack level cage physical security system with magnetic sensor shield is described herein. The rack level can be a physical security system that can include a rack cage, a body defining an internal volume that can contain at least one server, a door coupled to the body and moveable between an open position and a closed position, and a magnetic securement system that can prevent an external magnetic field from affecting a magnetic switch. The internal volume of the body can be accessible via the door when the door is in the open position.

The utility model relates to the technical field of excitation systems, in particular to an automatic field suppression device and an excitation system, comprising a primary excitation power supply which is electrically connected with a generator rotor according to a current output direction; the de-excitation loop comprises a de-excitation switch and a de-excitation resistor which are sequentially connected between the positive electrode and the negative electrode of the primary excitation power supply, and the de-excitation resistor is connected with the generator rotor in parallel; and the overvoltage protection loop is connected in parallel with the de-excitation resistor and comprises an overvoltage jumper and an overvoltage resistor which are connected in sequence. According to the utility model, the primary excitation power supply, the field suppression circuit and the overvoltage protection circuit are used in cooperation, overvoltage protection can be provided for the field suppression circuit, the reset button is used in cooperation with the remote / local control module, manual reset is realized, and the problem of remote and local control switching is solved.

To supply power from a vehicle to a power load with a simple system configuration.SOLUTION: In the power supply system 101, the power supply device 3 supplies AC power from the vehicle 4 to the load 123 when the vehicle 4 is connected. The first electromagnetic switch 51 can switch between electrical connection and disconnection between the earth leakage breaker 1 and the overcurrent breaker 113. The second electromagnetic switch 52 can switch electrical connection and disconnection between the first electromagnetic switch 51 and the power supply device 3, and can switch electrical connection and disconnection between the overcurrent breaker 113 and the power supply device 3. The ammeter 130 measures a current value between the overcurrent breaker 113 and the load 123. The power supply system 101 closes the first electromagnetic switch 51 and opens the second electromagnetic switch 52 when the vehicle 4 is connected to the power supply device 3 and the measurement value measured by the ammeter 130 exceeds the threshold value β.SELECTED DRAWING: Figure 1

1. Name of this product design: Keyboard switch (KT magnetic switch). 2. Purpose of this design: This design is used as an accessory for keyboard keys. 3. The key design feature of this product is its shape. 4. The picture or photo that best illustrates the key design points: Design 1 3D diagram 1. 5. Design 1 is designated as the basic design.

A flow rate sensor that can be integrated with a component of a fluid system includes a housing having fluid ports attached to the component and an internal cavity having a spindle and a rotor comprised of a plurality of paddles attached to a hub rotatably mounted on the spindle. The paddles rotate the hub around the spindle when a fluid is introduced into the cavity from a fluid port. A magnetic element attached to the hub rotates along with the rotor. A magnetic switch located in a sealed compartment is in magnetic alignment with the magnetic field produced by the magnetic element. Rotation of the magnetic element causes the magnetic switch to generate electrical signals corresponding to the rate of fluid flowing into the sensor from the component.

The utility model provides an electromagnetic coil assembly and semiconductor processing equipment. The electromagnetic coil assembly comprises a direct current power supply; an electromagnetic coil; the current steering device is connected between the electromagnetic coil and the direct-current power supply; the current steering gear comprises a first magnetic switch and a second magnetic switch, and the first magnetic switch and the second magnetic switch comprise a movable contact, a normally open contact and a normally closed contact; a movable contact of the first magnetic switch is connected with a first end of the electromagnetic coil, and a normally open contact and a normally closed contact are respectively connected with a positive electrode and a negative electrode of the direct current power supply; a movable contact of the second magnetic switch is connected with the second end of the electromagnetic coil, a normally open contact and a normally closed contact are connected with the negative electrode and the positive electrode of the direct-current power source respectively, and the first magnetic switch and the second magnetic switch are switched synchronously. The current direction of the electromagnetic coil can be conveniently controlled, and the stability of the deposition process and the product quality are improved.

The invention discloses a breaking hammer with a piston reset function and a storage control method, and belongs to the technical field of breaking hammer control, the storage control method comprises the following steps: acquiring a signal that an excavator is switched to an intelligent storage mode, starting to receive a nitrogen pressure feedback signal in a rear cylinder body, and if the nitrogen pressure is greater than 0, starting to control the piston reset function; if yes, an electromagnetic switch on the rear cylinder body is controlled to be turned on to release nitrogen, and nitrogen pressure is gradually reduced; if the nitrogen pressure is reduced to 0, a main pump starts to be controlled to work, and high-pressure oil is supplied to a middle cylinder body, so that a piston continuously ascends under the action of the high-pressure oil; and when a reversing point on the piston reaches the position of a signal groove in the middle cylinder body, a piston tail end position signal is obtained, the main pump is controlled to stop working, and then the electromagnetic switch on the rear cylinder body is controlled to be turned off. Manual operation is not needed, automatic nitrogen discharging of the breaking hammer and automatic retraction of the piston can be achieved, and the corrosion phenomenon of the sealing section of the piston during long-term storage is prevented.

A hydraulic pump assembly for DHT (Diverterless Hydrodynamic) and its operating method are disclosed, belonging to the field of vehicle transmission technology. The assembly includes a top cover assembly stacked along the assembly axis for integrating oil supply and hydraulic control functions; a valve body partition for orderly isolation of multiple hydraulic channels; a reaction support for supporting the integrated oil circuit and providing one-way protection; and fixing bolts for locking and securing. The top cover assembly, using the valve body top cover as its mounting base, integrates an electromagnetic switching valve, a temperature sensor, a pressure regulating valve, a locating pin, a flow divider valve, and a mechanical pump rotor assembly. The valve body partition employs a customized partition structure matched to the internal oil circuit layout. The reaction support, using the lower valve body plate as its mounting base, is equipped with a cup-shaped plug and a one-way valve assembly. This invention shortens the oil circuit path, reduces system leakage points and hydraulic pressure loss, and improves the control response speed and operational stability of the hydraulic system.

This invention relates to the field of electricity meter metering box technology, and particularly to an IoT lock device and method for online monitoring and control of the opening and closing of the metering box. The device includes a metering box, a door, and a lock plate. The door is rotatably mounted on the metering box, and the lock plate is fixed to the outside of the door. Inside the lock plate are an IoT lock and lock monitoring equipment. The IoT lock has an electronic latch, and an IoT lock power induction coil is installed on the lock plate and electrically connected to the IoT lock. A metering switch inside the metering box is connected to the IoT lock via a composite contact through a CAN bus and power supply. A door magnetic switch on the door frame communicates with the IoT lock. The method transmits commands containing a unique lock management code via the CAN bus. After verification by the IoT lock, it controls the electronic latch to move. The door magnetic switch provides feedback on the door status, and the lock monitoring equipment verifies the status. This invention achieves authorized control and operation traceability, improves security level and monitoring reliability, provides dual interlocking to ensure equipment safety, optimizes installation and maintenance, and is suitable for outdoor environments.

The invention relates to a fail-safe disconnecting unit (100, 200) having a DC connection (12) for connecting a DC load (30) and an AC connection (11) for connecting an AC network (20), wherein the disconnecting unit (100, 200) is designed to safely disconnect a power path between the DC connection (12) and the AC connection (11), wherein the disconnecting unit (100, 200) has an activatable and deactivatable alarm device (102) and two electromagnetic switch units (K1, K2) arranged in the power path between the AC connection (11) and the DC connection (12), wherein a first switch unit (K1) is arranged in a DC region of the power path and wherein a second switch unit (K2) is arranged in an AC region of the power path, wherein the disconnecting unit (100, 200) is designed, in an activated state of the alarm device (102), to control the first switch unit (K1) with a target state, to open a first main contact (K1.1) of the first switch unit (K1) in order to disconnect the power path in the DC region, and, depending on an actual state of the first main contact (K1.1), to separate the power path in the AC region by means of the second switch unit (K2). The invention also relates to a rectifier (10) and to a method for operating a rectifier (10).

This invention relates to an anti-collision system for a home elevator, which includes a car, a counterweight, and a traction assembly connecting the two. The anti-collision system includes a primary anti-collision trigger, a secondary anti-collision trigger, and an electromagnetic switch assembly. The primary anti-collision trigger is located on the movement trajectory of the car or counterweight and is triggered at its trigger end in response to compression by the car or counterweight. The secondary anti-collision trigger is located on the movement trajectory of the car or counterweight and is located after the primary anti-collision trigger; its trigger end is triggered at its trigger end in response to compression by the car or counterweight. The electromagnetic switch assembly is connected in series with the traction assembly in the safety circuit of the home elevator. Both the primary and secondary anti-collision triggers are connected to the electromagnetic switch assembly, and the electromagnetic switch assembly disconnects upon triggering either one. This achieves anti-collision and improves the safety performance of the home elevator.

The invention relates to a magnetic switch for starting an automobile, which relates to the technical field of new energy automobile manufacturing and comprises a switch body and two binding posts fixedly arranged at one end of the switch body. Two opposite protective shells are arranged outside the end face, facing the binding post, of the switch body, and protective cavities are formed in the side faces, close to each other, of the two protective shells. A mounting opening is formed in the side face, facing the switch body, of the protective shell, a locking piece is arranged, a wiring notch is formed in the edge of an opening of the mounting opening, and a positioning protruding block is fixedly arranged on the inner wall of the opening; a limiting groove is formed in the switch body; the side edges, away from the switch body, of the two protective shells are rotationally connected through a rotating shaft. According to the invention, after the binding post and the connecting cable are in butt joint, the two protective shells are rotated oppositely to a protection state that the two protective shells are close to each other, and muddy water, dust and other impurities splashed on a muddy road surface are effectively prevented from making contact with the joint of the binding post and the cable.

The invention discloses a magnetic circuit positioning structure and an electromagnetic switch, and relates to the technical field of electromagnetic structures.The magnetic circuit positioning structure comprises a yoke plate and a coil frame, the yoke plate is provided with a positioning boss and a first center hole for a movable iron core to penetrate through, the positioning boss is configured to be a circular truncated cone, and the first center hole is formed in the circular truncated cone; the first center hole and the circular truncated cone are coaxially arranged; a positioning ring table is arranged on the coil frame, a second center hole for the movable iron core to penetrate through is formed in the positioning ring table, the positioning ring table and the second center hole are coaxially arranged, and a positioning part is arranged on the inner circumferential wall of the positioning ring table; when the yoke iron plate is connected with the coil rack, the circular truncated cone extends into the positioning ring table, and the outer curved surface of the circular truncated cone is in interference fit with the positioning part, so that the first center hole and the second center hole are coaxial. According to the technical scheme provided by the invention, the positioning accuracy of the magnetic circuit structure of the electromagnetic switch is improved, and the normal use of the electromagnetic switch is ensured.

A bistable electrical switching device (1) is provided. The bistable electrical switching device (1) includes a controller and an electromagnetic drive unit (2), wherein the electromagnetic drive unit includes a movable armature (3) movable between a first stable position and a second stable position. The controller is configured to provide a first actuation signal (800, 900) to move the movable armature (3) from the first stable position to the second stable position, wherein the first actuation signal includes at least two first pulses (801) having a first polarity, and wherein the controller and the electromagnetic drive unit are configured such that the pulses having the first polarity accelerate the armature from the first stable position toward the second stable position.

The application provides a refrigerator door state detection method, a controller, a refrigerator, a medium and a program product, and comprises the following steps: collecting historical operation parameters of the refrigerator in a first time period before a current time, preprocessing the historical operation parameters to obtain a first parameter time sequence; inputting the first parameter time sequence into a pre-trained prediction model, and outputting a second parameter time sequence in a second time period after the current time through the prediction model; collecting an actual parameter time sequence of the refrigerator in the second time period, determining a residual error sequence according to the actual parameter time sequence and the second parameter time sequence, and calculating a residual error characteristic value of the residual error sequence; obtaining a door magnetic switch signal of the refrigerator door through a door magnetic sensor, and determining a door opening and closing state of the refrigerator door according to the door magnetic switch signal and the residual error characteristic value. The application can solve the problem that the existing refrigerator cannot identify door body virtual masking and chronic leakage, and accurately distinguish the door body state.

The utility model relates to the technical field of dismounting machines for magnetic switches of automobile starters, and discloses a dismounting machine for a magnetic switch of an automobile starter, which comprises a machine body, supporting legs are fixedly mounted at the bottom of the machine body, a hydraulic station is arranged at the bottom of the machine body, and a hydraulic clamping mechanism is arranged in the machine body. A pushing ejection mechanism is arranged in the machine body, the pushing ejection mechanism comprises an ejection assembly and a pop-up assembly, the ejection assembly is arranged on the inner wall of the left side of the machine body, and the pop-up assembly is arranged outside the ejection assembly. According to the disassembling machine for the magnetic switch of the automobile starter, through the arranged pushing ejection mechanism, in the using process, an ejection block is pushed through a hydraulic rod to eject out an inner core of the magnetic switch of the automobile starter, meanwhile, an outer shell of the magnetic switch of the automobile starter is ejected out of the machine body through a pushing frame, and therefore the inner shell does not need to be manually taken out; and the use process is more convenient.