52 results about "Magnetic starter" patented technology

The invention discloses an automatic cyclic bookcase, and relates to a bookcase and a control method thereof. The bookcase comprises a box body, and a cyclic component, a driving component and an automatic cyclic control system which are mounted in the box body, wherein an output end of the automatic cyclic control system is connected with an input end of the driving component, and an output end of the driving component is connected with the cyclic component. The method comprises the steps that a bookshelf selection key corresponding to a target bookshelf is pressed; number information of the target bookshelf and number information of a bookshelf located in a book taking opening are sent to a master control circuit; the master control circuit compares the number information of the two bookshelves, judges rotation directions of motors, sends a control signal to a magnetic starter A or a magnetic starter B, and then starts the motors; and when the target bookshelf reaches the book taking opening, the master control circuit sends a motor stop control signal to a magnetic starter C, so that a motor control circuit is disconnected, the motors are stopped, and the target bookshelf stops in the book taking opening. The bookcase and the control method can increase the book collection capacity, reduce a book floor area, increase the book finding speed of a reader, and facilitate book management.

The invention discloses a mine protection power monitoring system. The mine protection power monitoring system comprises a main controller terminal and a plurality of monitoring terminals, wherein the main controller terminal and the plurality of monitoring terminals are connected through a communication network. The monitoring terminals output differential signal information to the main controller terminal and receive differential signal information of the main controller terminal. The mine protection power monitoring system can be used for a mine high-voltage distribution switch and a high-voltage magnetic starter, and contains 6kV and 10kV voltage classes and 5-630A rated operational currents. Because a double-central-controller unit is used for controlling, the power monitoring system is higher in precision, more accurate, more stable in performance and faster in processing speed, and can set and calibrate in a full digitalization mode. The power monitoring system is provided with protection functions such as undervoltage, overvoltage, overload, short circuit, phase equilibrium, earth leakage protection (grounding protection) and insulation monitoring, remote metering-remote signaling-remote controlling-remote regulating functions in a form of RS485 or a controller area network (CAN) bus, a calendar clock, and a fault memorizing and searching function. A current transformer or a hollow current transformer can be selected for use without replacing current transducers for different rated current classes.

The invention provides a power supply converter of a high-speed permanent magnetic starter generator and a control method of the power supply converter. The power supply converter comprises a currentdetection circuit, an SiC device full-control full-bridge, an SCR device phase-control full-bridge, a switching circuit, a voltage detection circuit and a control circuit. Output electrical frequencyof the generator is improved to 1-2kHz, and the weight of a starter generator system can be remarkably reduced. The applicable generator rotation speed range is quite wide. By use of a voltage increasing and decreasing power supply converter topology structure, the high voltage of armature winding voltage of the starting generator is higher than corresponding winding voltage by use of a full-control full-bridge voltage increasing topology, winding current can be effectively reduced and realizability of the motor winding is improved. Own synchronous inductance of the starter generator can be increased, there is no need to add auxiliary big inductors in the power supply converter and additional loss caused by high-frequency ripple current of a three-phase full-control full-bridge injection motor is reduced. A power device in the power supply converter is allowed to work near direct current bus voltage, and requirements on power devices imposed by working voltage and working current are quite low.

The invention discloses an AC brushless electro-magnetic starter generator employing concentrated windings. The AC brushless electro-magnetic starter generator is characterized by sequentially comprising a rotor core, a stator core, stator singe-tooth-wound concentrated exciting windings and stator single-tooth-wound concentrated armature windings from the inside to the outside along the radial direction, wherein the stator singe-tooth-wound concentrated exciting windings and the stator single-tooth-wound concentrated armature windings are evenly distributed into each stator slot; and the stator singe-tooth-wound concentrated exciting windings and the stator single-tooth-wound concentrated armature windings need to separate by an insulating material in each slot. According to the brushless electro-magnetic starter generator employing the concentrated windings achieved by the invention, the overall structure is very simple; processing and manufacturing can be finished by an existing technology; extra equipment does not need to purchase; and furthermore, the generator is very high in reliability and basically free of maintenance.

The invention relates to a reversible magnetic starter for an underground coal mine electric power driving multiple rotary executing mechanism. A test / working mode option switch and three buttons used for starting, closing and stopping respectively are arranged on a panel of a flameproof enclosure; a display unit of the reversible magnetic starter is a touch screen, an operation unit comprises the test / working mode option switch and the starting, closing and stopping buttons, and a signal collecting and processing unit comprises a signal processing plate and an analog-to-digital conversion module; and the units are connected with a programmable logic controller of a control unit respectively. The reversible magnetic starter has high reliability and high anti-interference capability, is used for the controls of the underground coal mine electric power driving multiple rotary executing mechanism such as local / remote control, starting, closing, stoping, self-hold / instantaneous acting, journey limiting, and torque limit control, performs comprehensive and real-time protection to prevent the faults of an unclosed contact point of a contactor, an overloaded electric current, a short-circuited electric current, lacking phase, under / over voltage, an earth leakage lockout resistance; and meanwhile, the touch screen can display, record, store, and check the working state or fault type and parameters.

In a personal watercraft with a watercraft body including a hull forming a bottom portion and a deck covering the hull from above, a magnet box is integrally combined with a battery storage tray. The watercraft also includes an engine disposed within the watercraft body, and a saddle-type seat disposed above the engine. A magnet box, including a main box body and a lid member, sealingly stores an electromagnetic starter switch therein, and is disposed in front of a battery storage tray, in order to reduce the distance between the magnetic starter switch and a starter motor. The main box body is formed integrally with a battery storage tray which is disposed in back of the engine and fixedly disposed on a floor portion of the watercraft body. The lid member is adapted to sealingly close the main box body of the magnet box in a fluid-tight manner.

The invention discloses a modular vacuum magnetic starter. The modular vacuum magnetic starter is provided with a starter body, wherein the starter body comprises a contactor 1 and a controller 2, the contactor 1 is provided with a contactor shell 3, three containing cavities are arranged in the contactor shell 3 in sequence from top to bottom, an electromagnetic device 4, a vacuum pipe 6 connected with the electromagnetic device 4 through a connecting mechanism 5 and a current transformer 7 connected with the vacuum pipe 6 are arranged in each containing cavity, the controller 2 is provided with a controller box 8 which is matched with the contactor shell 3, an electric wire is connected between the controller box 8 and the contactor shell 3, and the controller box 8 and the contact shell 3 are locked together through a locking mechanism. The modular vacuum magnetic starter has the advantages that the size is small, maintenance is convenient, a control system is arranged, and mechanical and electronic integration is achieved.

The invention relates to an explosion-proof type coal mining machine motor electric control device which comprises a magnetic starter and further comprises a control transformer, a conversion controller and an isolating switch. The isolating switch is arranged on a main circuit of a coal mining machine motor and is connected with a three-phase power supply output from the secondary side of the magnetic starter, a primary side power supply of the control transformer is connected with the secondary side of the magnetic starter, a first secondary power supply circuit is connected with a remote control circuit, a second secondary side power supply circuit is connected with a left / right traction and lifting / descending control circuit of the coal mining machine motor, and a lead-out line of the magnetic starter is connected with a manual control circuit. The explosion-proof type coal mining machine motor electric control device adds the mechanical / electric locking function in an electric control circuit of an explosion-proof motor, improves the quality of the motor, prolongs the service life of the motor, avoids troubles caused by using misoperation underground a coal mine, guarantees personnel safety, reduces human and material resource loss and guarantees zero load of the isolating switch before operation from the mechanical aspect and the electric aspect.

The invention relates to a reversible magnetic starter of a power-driven multi-turn execution mechanism. A display unit comprises a touch screen; an operating unit comprises a test / working mode selection switch, the touch screen and a change-over switch; a signal acquisition unit comprises a signal processing board and an analog-digital conversion module; and the units are connected with a programmable controller of a control unit respectively. The reversible magnetic starter is high in reliability and strong in anti-interference capacity, is used for controlling local / remote places, start, closure, stop, self protection / instantaneous release, travel limit, torque limit and the like of the power-driven multi-turn execution mechanism, and carries out comprehensive protection on turn-on of a contact of a contactor, current overload, current short circuit, default phase, under-voltage, earth leakage latching resistance and the like in real time; and the touch screen displays working conditions or fault types and parameters in real time, and can carry out recording, storage and viewing.

The invention discloses a mechanical control device for automatically controlling a forced draught fan in the soft environment. A pilot valve, a discharge valve, a pneumatic switch, a pneumatic time delay valve and a pneumatic control valve are added into a pneumatic control loop which is formed by sequentially connecting a forced draught fan oil vapor tank, the pneumatic control valve, a hand operated valve, the discharge valve, an inverse proportion valve, a butterfly valve control cylinder, the pilot valve, a shuttle valve, a pressure maintaining valve and a ball valve pneumatic element; an explosion-proof electric contact pressure gauge is arranged in an electric pneumatic control loop; a time relay and an intermediate relay are connected in parallel with a magnetic starter control loop; a pressure gauge on the forced draught fan oil vapor tank is replaced by the explosion-proof electric contact pressure gauge; and a forced draught fan remote-control staring button loop is connected in series with the mechanical automatic control device of a toggle switch. When a pressure of a compressed air system is low, the forced draught fan automatically starts; and when the pressure of the compressed air system is high, the forced draught fan automatically delays and performs soft stop, and the system pressure is kept in a certain range. The automatic control device realizes automatic control, and automatic delay buffer stop, so that impact of high pressure gas on mechanical devices, such as an engine body and the like is relieved, potential safety hazard caused by overpressure of compressed air is removed, automatic start and automatic delay loading, automatic unloading, and automatic delay buffer stop are realized, and the whole procedure has the functions of automatic control and protection. The automatic control device for the forced draught fan has the advantages of simple structure, easy operation, convenient maintenance, safety, reliability and the like.

The invention discloses a twin portable blower failure diagnosis and automatic switchover closedown integration device. The device comprises a main board, a locking, a display board and a distribution block. The control main board is connected with the display board, the display board is connected with the distribution block through a terminal, the sensor signal input terminals on the control main board, electric relay control output and 36V alternating current input terminals are connected with the distribution block. Corresponding on-the-spot apparatus magnetic starters are controlled through gathering down-hole face of heading sensor signal output to monitor the operating status of main and sub portable blower and working area in order to realize collection mash gas fault location indication and twin portable blower automatic switchover control. The distribution block provides all input and output terminals of device. The circuit accords local safe claim, solves a series of difficult problems such as twin portable blower failure diagnosis and automatic switching and monitoring, mash gas fault location, wind, electric and gas reliable locking and so on for middle or small coal mines without monitoring executive supervisor, and can be abroad used in mash gas mines.

The invention discloses an underground coal mine short-distance multi-purpose special hoisting vehicle device including a mining vehicle chassis, an equipment placing frame, a lifting arm, a rotatingshaft, support leg hydraulic cylinders, a lifting hydraulic cylinder, two sets of wheel pairs, two bump heads, a complete chassis, channel steel, a transition frame, a steel plate, a connection plateand a base. The equipment placing frame is provided with a hydraulic station and a magnetic starter, the hydraulic station is connected with the magnetic starter through a cable, a travel motor and apipe of the hydraulic station are connected and installed, the four corners of the transition frame are equipped with the support leg hydraulic cylinders, the two ends of the lifting hydraulic cylinder are connected to the lifting arm and the rotating shaft, the lifting hydraulic cylinder supports the lifting arm, the magnetic starter converts electrical energy into hydraulic energy through the hydraulic station, the hydraulic energy enters all functional electromagnetic reversing valves through high-pressure oil pipes, the electromagnetic reversing valves are operated to control the hydrauliccylinder and the motor, and therefore the functions of travelling, lifting and stable supporting are realized; and by rotating the lifting arm, material transfer within a large angle range can be realized.

The invention provides an automatic drainage control system. The automatic drainage control system comprises a magnetic starter, a power module, an electrode sensor, a relay J1, a relay J2, a first control loop and a second control loop. The magnetic starter controls the on-off state of a water pump, the normally open contact of the relay J1 is connected with the normally open contact of the relay J2 in series, and the normally open contact of the relay J1 and the normally open contact of the relay J2 are separately connected with three pins of the magnetic starter in parallel. The electrode sensor comprises a lower limit water level sensor body and an upper limit water level sensor body. The first control loop comprises a first input end, a second input end and an output end. The first input end is connected with the upper limit water level sensor body, the second input end is connected with the output end of the power module, and a coil of the relay J1 is arranged between the output end of the first control loop and a power end. The first control loop is identical with the second control loop. The system has the advantages of being capable of achieving automatic drainage and effectively preventing the situation that a water pump idles due to insufficient water.

The invention discloses a concrete conveying pump for a mine sump. The concrete conveying pump comprises a hopper, a motor and stirring mechanism, an S pipe valve and swing mechanism, an outer cover,a setting accelerator box, a hydraulic system, a conveying pump motor, an oil tank, a vacuum magnetic force starter, and a rack; the hopper is arranged on the right side of the rack, the motor and stirring mechanism is arranged in the hopper, the S pipe valve and swing mechanism is arranged on the left side of the hopper, the outer cover is wholly arranged on the top of the rack, the setting accelerator box is arranged on the top of the right side in the outer cover, the hydraulic system is arranged in the middle of the right side in the outer cover, the conveying pump motor is arranged on theleft side in the outer cover, the oil tank is arranged on the left side of the outer cover, and the vacuum magnetic force starter is arranged on the left side of the top of the rack. The conveying pump is simple in structure, reasonable in design, stable in work state, reliable in property, high in environment adaptation capacity and capable of achieving mechanical automation of mine sump clearing and excavating.

The invention relates to an automatic liquid adding device of an underground coal mine emulsified liquid. The particular technical scheme is that the emulsified liquid adding device comprises an emulsified liquid tank, a liquid intake pipe, a liquid discharge pipe, a filter, a check valve, a liquid level switch and an emulsified liquid adding pump, wherein two ends of the emulsified liquid tank are connected with two flanges; the liquid intake pipe and the liquid discharge pipe are respectively connected to the emulsified liquid tank and the liquid adding pump; a liquid guide pipe at the other side of the liquid adding pump is connected with an emulsified liquid barrel; the liquid level switch is installed at the top of the emulsified liquid tank. The automatic emulsified liquid adding device is characterized by also comprising an automatic control system consisting of a vacuum magnetic force starter and an anti-explosion button which can be used for controlling the liquid adding pump. The automatic emulsified liquid adding device consists of simple parts, the design and manufacture are very simple, meanwhile, the use is very convenient; parts are also very convenient to replace when being damaged; the automatic emulsified liquid adding device can be adaptive to severe underground working environment, cannot generate adverse environmental influences, and is very suitable for underground coal mine working environment.

A broken chain monitoring and protecting system for a scraper conveyor comprises a machine head infrared sensor, a machine tail infrared sensor, a motor, a current transformer, a magnetic starter, an electric parameter collection module, a machine head controller, a machine tail data transmission module, a monitoring host, a horizontal chain ring, a vertical chain ring, a support, an air chamber, air holes, a base, an anti-explosion infrared sensor, a sealing cover, glass, an air channel sealing sleeve, an air inflow nozzle, an air way, a starting button and a shutdown button. The magnetic starter is connected to the motor through the current transformer. The current transformer is also connected to the electric parameter collection module. The electric parameter collection module is connected to the machine head controller. The starting button and the shutdown button are connected to the machine head controller. The base is arranged at one end of the anti-explosion infrared sensor. A protective sleeve is arranged on the outer wall of the anti-explosion infrared sensor. The air chamber is connected to the other end of the anti-explosion infrared sensor through the glass. The sealing cover is arranged on the side wall of the air chamber. The broken chain monitoring and protecting system is simple in overall structure, good in stability and high in reliability.

The invention discloses a rolling brush assembly for a steel formwork steel wire grinding machine in civil construction. The rolling brush assembly comprises a spindle, and seven rolling brushes are sequentially installed on the spindle in a sleeving mode. The left part of the spindle penetrates through a left bearing seat, the right end portion of the spindle is inserted into a center hole of a right bearing seat, a driven pulley is installed on the left end portion of the spindle. The left and right bearing seats are fixed to a base, a motor is installed at the edge of the base, a driving pulley is installed at the output shaft end of the motor. The driving pulley is connected with the driven pulley through a V-belt, a magnetic starter external-connecting remote control button is arranged on the base, a safety protective cover is installed on the left and right bearing seats, and sprayers are arranged on the inner side of the safety protective cover. U-shaped steel wire rope bristlesare clamped between two pieces of brush plates, and positioning is carried out by screwing nuts on brush plate bolts, so that the other ends of the U-shaped steel wire rope bristles are arranged in acircumferentially flush structure mode. The rolling brush assembly for the steel formwork steel wire grinding machine in civil construction is developed on the basis of recycling steel wire rope materials in a reserve warehouse, the manufacturing cost is low, waste is turned into treasure, and the construction cost is reduced.

The invention discloses a magnetic starter, which comprises a shell, a magnetic energy storage device, a speed increasing gear, an engaging and disengaging gear and starting shafts which are arranged on the shell, wherein an external magnet of the magnetic energy storage device is fixed on the shell; an internal magnet is arranged on a hollow shaft; the hollow shaft is provided with a ratchet wheel, a control clamping hole and a gear a; a control rod is arranged in the hollow shaft, extends out of the shell, and is provided with a handle; the gear a is meshed with a pinion b on the speed increasing gear; a bull gear e on the speed increasing gear is meshed with a gear d fixed on a starting shaft a, is provided with a pinion c, the pinion c is meshed with an engagement and disengagement control gear, and the engagement and disengagement control gear is fixed on an engagement and disengagement control shaft; an engagement and disengagement control wheel, a ratchet wheel and a ratchet wheel handle are arranged on the engagement and disengagement control shaft; the engagement and disengagement control wheel is used for controlling an engagement and disengagement control rod; the engagement and disengagement control rod is used for realizing separation of the starting shafts through reciprocating movement; an engagement and disengagement sheet is arranged at a position where the starting shaft a is combined with a starting shaft b; and the starting shaft b extends out of the shell, and is provided with a starting gear.

The invention discloses an earthing and turn-to-turn short circuit testing device of a rotor of a permanent magnetic starter motor. The device comprises an earthing tester, a turn-to-turn tester, a test bench, a test rack fixed on the test bench and a drive mechanism which drives a rotor of the permanent magnetic starter motor to rotate, wherein the test rack comprises two oppositely arranged support plates, and are respectively provided with a slot which is clamped on each end of the rotor of the permanent magnetic starter rotor; and in the drive mechanism, the end part of a stand column is hinged with one end of a test rod, and one end of a connecting rod is connected with a turn-to-turn box of the turn-to-turn tester which is lifted through a through hole along with rotation of the test rod. The testing device has the advantages that: 1, the turn-to-turn box leaves from the rotor in an earthing short circuit test, and an earthing test head leaves from the rotor in a turn-to-turn short circuit test, so that automatic switching of the two tests is realized; and 2, the earthing short-circuit test and turn-to-turn short circuit test can be automatically, safely and stably carried out on the rotor, so that the testing quality and the testing efficiency are improved.

The invention discloses an automatic drainage device of an underground magnetic starter. The drainage device comprises a drainage control device and a backstop, the drainage control device comprises an isolation switch QS, a comprehensive protector JDB1, a comprehensive protector JDB2, a switch SB1, a vacuum contactor KM, an intermediate relay ZJ and a switch SB2, the output end of the switch SB1is connected with a contact K and a contact KM2 in series and is connected with a 2# line, and the input end of the switch SB1 is connected with a 1# line in parallel; and a 9# output terminal of thecomprehensive protector JDB1 is connected with a 9# line. According to the automatic drainage device for the underground magnetic starter, a first floating body, a magnet, a second floating body, a magnet, a high-water-level normally-open contact KM5 and a low-water-level normally-open contact KM6 are arranged, so that the purpose of automatic drainage according to water level changes is achieved.The backstop is mounted, so that water cannot flow back to a water accumulating pit, and people do not need to guard. The whole automatic drainage is unattended, so that the labor force requirement is reduced, and the cost is saved.

The invention provides excitation winding structure of an exciter of a brushless electro-magnetic starter generator, and a starting / power generation switching method thereof. The winding structure comprises an N-pole winding, an S-pole winding, a first contactor and a second contactor. The N-pole winding is wound on the spaced magnetic pole iron cores in the exciter in series, and the S-pole winding is wound on the remaining spaced magnetic pole iron cores in series; one end of one winding is connected with the static contact of the first contactor, and the other end is connected with one contact of the second contactor and one pole of the excitation power supply; one end of the other winding is connected to one movable contact of the first contactor and the other pole of the excitation power supply, and the other end is connected to the other movable contact of the first contactor and the other contact of the second contactor; and the polarities of the two windings connected to the second contactor are the same. By changing the series-parallel connection structure of the windings, the number of effective series connection turns of the windings during starting is reduced, the output capacity of the exciter during starting is improved, and the number of effective series connection turns of the winding during power generation is increased, the winding resistance is increased, the excitation current is reduced, and the excitation voltage is increased.

The invention discloses an earthing and turn-to-turn short circuit testing device of a rotor of a permanent magnetic starter motor. The device comprises an earthing tester, a turn-to-turn tester, a test bench, a test rack fixed on the test bench and a drive mechanism which drives a rotor of the permanent magnetic starter motor to rotate, wherein the test rack comprises two oppositely arranged support plates, and are respectively provided with a slot which is clamped on each end of the rotor of the permanent magnetic starter rotor; and in the drive mechanism, the end part of a stand column is hinged with one end of a test rod, and one end of a connecting rod is connected with a turn-to-turn box of the turn-to-turn tester which is lifted through a through hole along with rotation of the test rod. The testing device has the advantages that: 1, the turn-to-turn box leaves from the rotor in an earthing short circuit test, and an earthing test head leaves from the rotor in a turn-to-turn short circuit test, so that automatic switching of the two tests is realized; and 2, the earthing short-circuit test and turn-to-turn short circuit test can be automatically, safely and stably carried out on the rotor, so that the testing quality and the testing efficiency are improved.

The invention relates to a coal mine power supply control device capable of being stopped when not used. The coal mine power supply control device comprises a load controller which is arranged in a load anti-explosion vacuum magnetic starter and a power supply controller which is arranged in an anti-explosion power supply vacuum switch. The load controller comprises a starting button and a stopping button, wherein the starting button is in parallel connection and in mechanically follow-up with a starting switch of the load anti-explosion vacuum magnetic starter, and the stopping button is in serial connection and in mechanically follow-up with a stopping switch of the load anti-explosion vacuum magnetic starter. When the starting button is pressed down, the load controller can send out a first signal. When the stopping button is pressed down, the load controller can send out a second signal. The load controller is in communicated connection with the power supply controller. When the power supply controller receives the first signal, the anti-explosion power supply vacuum switch is controlled to be closed. When the power supply controller receivers the second signal, the anti-explosion power supply vacuum switch is controlled to trip. The coal mine power supply control device can effectively improve power supply safety and reduce electric leakage accidents.

The invention discloses a control device for an explosion-proof air compressor, and relates to the technical field of air compressors. The control device comprises an explosion-proof control box, anda controller and an electric control element unit are arranged in the explosion-proof control box. According to the control device for the explosion-proof air compressor, explosion proofness of a control system is achieved through the explosion-proof control box, so that the technical upgrading and research and development cost is lower, and the advancement of the control system can be easily kept; an explosion-proof operation button, an explosion-proof emergency stop button and an explosion-proof signal lamp are arranged on an outer guide control panel through the remote control function of acommunication module arranged in the controller in an outer guiding manner, so that the requirement of daily operation is met; and therefore, the problem that an existing control system for existingexplosion-proof air compressor usually depends on a magnetic starter to control parameters such as pressure and flow of the air compressor, and adjustment generally depends on a mechanical mode, resulting in existence of great limitation is solved.

The invention discloses a heat pump type incubator temperature control device. The device mainly comprises a magnetic starter, a double-point temperature control instrument, a low-temperature sensor and a high-temperature sensor, wherein the low-temperature sensor and the high-temperature sensor are arranged in an incubating box and respectively connected with the double-point temperature control instrument; and one end of the magnetic starter is connected with a heat pump host machine compressor, and the other end is connected with the double-point temperature control instrument. The invention favorably solves the problem of frequent starting of the heat pump host machine compressor in a double-point temperature control incubating way; meanwhile, the heat pump type incubator temperature control device is beneficial to the reduction of the starting load of the compressor. In addition, the invention can realize bionic incubation and improve environmental adaptability and survival rate of a hatched young bird.

The invention relates to an automatic remote centralized control system and a centralized control method for main shaft loading. The system comprises a main shaft loading chamber, a main shaft truck room pressure monitoring system and a centralized control room, wherein the main shaft loading chamber, the main shaft truck room pressure monitoring system and the centralized control room exchange data through an optical fiber network to realize acquisition and control of equipment state information, the hardware of the centralized control room is composed of a network switch, an optical fiber transceiver and an industrial computer, a loading chamber control system comprises a programmable controller and a mining explosion-proof vacuum magnetic starter, the main shaft truck room pressure monitoring system comprises a network switch, an optical fiber transceiver and an industrial computer, and the loading chamber is provided with a console, and the working mode of the loading system is selected through a far and near control switch. The automatic remote centralized control system for main shaft loading not only realizes visual equipment operation and controllable equipment state, but also can perform self-diagnosis on the equipment through a powerful data processing function, and provides guarantee for preventive maintenance of a main lifting system.

The invention discloses a magnetic starter, and particularly relates to a double-line fast switch magnetic starter capable of recovering running fast when a line of controller breaks down. The double-line fast switch magnetic starter comprises a main loop and a control loop, the main loop comprises three-phase supply X1, X2 and X3, a separating change-over switch HGK, normally open contacts CKJ11 and CKJ21 of a vacuum contactor, a resistance-capacitance absorption device RC, electric motor comprehensive protectors JDB1 and JDB2 and wiring cavities of the starter D1, D1 and D3. The control loop comprises a control transformer KB, relays ZJ1 and ZJ2, a fuse protector RD1, fuse protectors RD2 and RD3, vacuum contactors CKJ1 and CKJ2, a stop button TA, electric motor comprehensive protectors JDB1 and JDB2 and a selector switch. When one line breaks down, the double-line fast switch magnetic starter can fast shift to a second loop by turning the micro change-over switch on the outer shell of the starter, the starter is enabled to work continuously, fault handling time is greatly shortened, the influence to the coal production is reduced, and production efficiency and production effect are improved.

The invention provides a movable continuous stirring and spraying system for a mine, and belongs to the technical field of stirring and spraying systems. An explosion-proof reversible magnetic starter, an explosion-proof vacuum magnetic starter and an electric cabinet are fixed on a second plate mine car; the spraying system comprises a concrete sprayer and a third plate mine car on which the concrete sprayer is fixed; a first plate mine car, the second plate mine car and the third plate mine car are connected to form a train; an outlet of a scraper is opposite to a stirring device; the outlet of the stirring device is opposite to an inlet of a conveyor; and the outlet of the conveyor is opposite to the inlet of the concrete sprayer. The system integrates conveying, stirring and spraying, can flexibly move under the shaft, completes the underground spraying at one time, greatly reduces the labor intensity of workers, improves the efficiency of underground spraying, reduces spraying rebound ratio and reduces the dust concentration in an underground space.

The invention relates to a circuit breaker with selective protection. The circuit breaker has a main electrically conductive path and a current-limiting electrically conductive path between a set of incoming line terminals and a set of outgoing line terminals, wherein the current-limiting electrically conductive path is connected in parallel with the main electrically conductive path. The main electrically conductive path comprises a breakpoint, a compression bar and a magnetic starter, the current-limiting electrically conductive path comprises a breakpoint, a bimetallic strip, a current-limiting resistor, and a shunt resistor, wherein the current-limiting electrically conductive path is connected in parallel with the main electrically conductive path between the incoming line terminals and the outgoing line terminals, the bimetallic element and the current-limiting resistor are connected in series in the current-limiting electrically conductive path, and two ends of the bimetallic element is connected in parallel with the shunt resistor. According to the invention, in the protection process of the selective protection circuit breaker, current flowing through the bimetallic strip when a short circuit exists can be reduced to protect the bimetallic strip from inferiority permanent deformation so as to prolong life endurance of the short circuit protection effectively.