484results about How to "Ensure safe work" patented technology

The number of operation keys is decreased, realizing cost reduction and miniaturization of a teaching device. Further, the working efficiency and operational safety are considerably improved. Also, the operations of the robot ranging from delicate positioning and high-speed continuous operation can be readily controlled by serial manipulations. The present invention includes (a) a plurality of operation keys to designate one out of a plurality of operation coordinates of the robot arm, and (b) a controller which controls the operation of the robot arm. The controller has a function to control the robot arm so that the robot arm is positioned on the designated operation coordinates and also a function to control the operation speed of the robot arm. The controller includes a jog dial disposed in a manner such that the jog dial can be rotated and pushed. When the jog dial is rotated in a state that the jog dial is not pushed, the position of the robot arm is controlled by the rotation of the jog dial, and when the jog dial is rotated in a state that the jog dial is pushed, the operation speed of the robot arm is controlled by the rotation of the jog dial.

The invention discloses an electric vehicle energy recovery system and a control method thereof. On the basis of the pressure of a brake master cylinder of an electric vehicle, a maximal brake force Fm which is allowed to be applied to a current driving wheel is obtained by calculating according to a brake force distribution curve in an electric vehicle brake system design and a driving wheel locking curve when the electric vehicle travels on a road surface with an ideal synchronous surface adhesion coefficient; and the Fm is converted into a torque, namely a maximal motor brake torque which can be applied currently so that the overall vehicle energy of the electric vehicle can be recovered to the maximum. Simultaneously, the calculated brake torque is corrected according to the requirements on the drivability and the safety of a vehicle, so that brake energy can be recovered to the maximum on the premise of ensuring the drivability and the safety of the electric vehicle.

The invention relates to an induction cooker control circuit suitable for cookers of different materials. The induction cooker control circuit comprises an IGBT (Insulated Gate Bipolar Translator), an IGBT driving module, an LC (Launch Control) resonance circuit, a central processing unit, a synchronous sampling circuit and a sampling circuit, wherein the LC resonance circuit is connected with the IGBT, and the central processing unit is connected with the IGBT driving module; the synchronous sampling circuit is electrically connected with the LC resonance circuit; and the sampling circuit is connected with the central processing unit and provides current and voltage signals. The control circuit also comprises a resonance frequency sampling circuit which is used for sampling a resonance frequency generated when the cookers of different materials work. The sampling point of the resonance frequency sampling circuit is arranged at the output end of the synchronous sampling circuit, and the output end of the resonance frequency sampling circuit is connected with the central processing unit. The output power and a power preset value are compared and the collected resonance frequency and a resonance frequency preset value are compared to judge whether the resonance frequency is beyond the resonance frequency range of safe working of an induction cooker or not. The output power of an electromagnetic coil is adjusted through the IGBT, so that a main loop working current works in a rated range, and therefore the safe working of the induction cooker is protected.

The invention discloses a lithium ion battery pack equalizing circuit with automatic polarity switch. The circuit comprises two buses used as sampling and equalizing time-sharing multiplexing channels, a relay network, a sampling module, an equalizing module and a computation control module, wherein one end of the relay network is connected with each battery monomer of a lithium ion battery pack, and the other end of the relay network is connected with the two buses so as to realize gating of different battery monomers; the sampling module is connected to the two buses and used for scanning and collecting the voltage of each battery monomer; the equalizing module is connected to the two buses and used for automatically performing polarity switch so as to match the polarities of the two buses and performing equalizing charge or equalizing discharge on each battery monomer; and the computation control module is connected with the relay network, the sampling module and the equalizing module respectively and used for receiving and processing the data from the sampling module in real time and sending an equalizing instruction of the processing result to the relay network and the equalizing module. The lithium ion battery pack equalizing circuit with automatic polarity switch disclosed by the invention is safe and reliable, is simple in structure and low in cost, and is easy to produce in a large scale and suitable for the equalizing process of the lithium ion power battery pack of an electric vehicle formed by connecting battery monomers in series.

The invention relates to the technical field of underwater robots, and particularly relates to a deep ocean work-type modular ROV control system, which comprises a remote communication system, a motion planning processor, a gesture detection system, a manipulator motion control system, a propeller control system, a video acquisition system, an underwater light control system, a hydraulic control system, and an underwater monitoring system, wherein the remote communication system is used for receiving an order sent by a water surface controller, acquiring data of each underwater subsystem and uploading the data; and the motion planning processor carries out integrated judgment and reasonably plans ROV motion control according to the current system state and the order sent by the water surface controller. The problem that the system is low in automation is solved; a correction and automatic judgment ability is strong; when each sub part of the system is wrong, other sub parts can cooperate mutually, safety work or recovery of the system can be ensured, and intelligence is high, and the fault tolerance ability is high.

The invention discloses an electromagnetic radiation parameter testing system. The system is composed of a receiving subsystem, a parameter testing subsystem, a signal processing and control subsystem and an auxiliary subsystem. The system can realize automatic testing by use of a lifting rotary turntable, a program-controlled attenuator and a microwave switch, and can automatically monitor and store multiple data; a power divider is used for providing multiple testing channels so as to test and monitor multiple radiation parameters in real time; and an amplitude limiter is used for performing key protection on an easily damaged testing element, thereby guaranteeing the safe work of the system. A wave detector is used for testing the pulse power so as to conveniently acquire the electric field waveform of the wideband time domain pulse; uncorrected envelope technology is used for measuring the pulse signal envelope, and the testing system structure is simplified; the automatic testing and storage of multiple dynamic data can be realized in real time, and a mater control computer and a comprehensive data post-processing software platform can realize seamless link. A powerful means is provided for the electromagnetic radiation testing of a complex electromagnetic environment.

The invention discloses a remote monitoring method and a system of an electric motor of an oil extractor based on power-frequency communication of electric wires, which belong to the technical field of the monitoring of petroleum extracting equipment and the system is the monitoring system based on the combination of the internal network of an oil field and the bidirectional power-frequency communication of electric wires. A remote monitoring terminal on the end of an oil extracting electric motor is connected with a concentrator on the end of a converting station by an electric distributing transformer, and the concentrator and the management center are connected by internal Ethernet interfaces of the oil field. The remote monitoring terminal and the concentrator use the mode of power-frequency communication for transmitting information and are arranged on the low-voltage side with the equipment of the monitoring system. Equipment connected and combined with the high-voltage electric transmission line is not required to be additionally arranged. A descent passage and an ascent passage between the converting station and the remote monitoring terminal modulate voltage wave shapes and current wave shapes to realize communication. Relevant departments monitor the running condition of the electric motor of every oil extractor by the Ethernet and the electric supplying line of the oil field. The invention is particularly suitable for the work environment of the oil field, has low cost and can be called the economical remote monitoring system of the electric motor of the oil extractor.

The invention discloses a SiC MOSFET driving circuit with crosstalk suppression capability. The SiC MOSFET driving circuit comprises a switch tube S1 and a switch tube S2 which are in push-pull connection. A driving resistance is connected between the switch tube S1 and the switch tube S2. The output end of the driving resistor is connected with a first-stage crosstalk suppression circuit and a second-stage crosstalk suppression circuit which are connected in parallel. The first-stage crosstalk suppression circuit comprises a capacitor C1 and a diode D2 which are connected in parallel. The second-stage crosstalk suppression circuit comprises a BJT tube T, a resistor R3 which is connected between the base electrode of the BJT tube and an emitter electrode in a parallel manner, and capacitors C2 and C3 which are connected between the collector electrode of the BJT tube and the base electrode in the parallel manner. The resistor R3 and the capacitor C3 are output ends. The SiC MOSFET driving circuit prevents mis-conduction through switching on and switching off negative voltage and reduces a negative voltage peak through the crosstalk suppression circuits.

The invention provides a blade imbalance on-line fault diagnosis method of a doubly-fed wind generator. The method comprises the steps that the rotating speed of the doubly-fed wind generator and the power signal P output by the generator are synchronously sampled; the input pneumatic torque T of a fan hub is estimated according to the rotational inertia J of the fan hub and the generator output power and the rotating speed which are synchronous sampled in the sampling period; order analysis is conducted to obtain a resampled pneumatic torque Ta, and the frequency fuzzy phenomenon caused by rotating speed variation is removed; power spectrum analysis is conducted on the signals after order analysis and reconstitution, and feature extraction is conducted; a frequency doubling power spectrum amplitude Q(1) and a frequency tripling power spectrum amplitude Q(3) are compared, and if Q(1) is larger than Q(3), it is judged that an imbalance fault happen. According to the blade imbalance on-line fault diagnosis method of the doubly-fed wind generator, the blade imbalance fault of the doubly-fed wind generator is judged according to the synchronously-sampled signals of the rotating speed, the voltages and the currents of the doubly-fed wind generator, and safe and normal working of a wind generating set is guaranteed. A used sensor is simple, convenient to mount and very suitable for field service.

The invention discloses a loudspeaker control method and a loudspeaker control device. The loudspeaker control method comprises the steps of: acquiring an input digital signal; filtering and buffering the input digital signal separately to obtain a buffer signal at the current moment; and adjusting gain of the buffer signal based on a voltage signal and a current signal at two ends of a loudspeaker at the current moment, so as to control structural performance parameters of the loudspeaker within a preset range. The loudspeaker control method and the loudspeaker control device can improve quality of audio signals output by the loudspeaker.

The present invention relates to a high-power electrical electronic rectification and inversion apparatus, and specifically relates to a valve tower for thyristor converter valves, applicable in the fields of high-power high-voltage power transmission engineering and high-power direct-current ice melting. The valve tower comprises two or more valve layers which are laminated from top to bottom. Each valve layer includes at least two converter valve assemblies arranged side by side, and adjacent two converter valve assemblies in the same valve layer are arranged with an interval therebetween and fixedly connected together. A maintenance area is formed in the interval between adjacent two converter valve assemblies in the same valve layer, and a maintenance channel for maintenance personnel to get in and out is formed by the maintenance areas in different valve layers in up-down correspondence. According to the invention, the valve tower has the maintenance channel which provides a space for the operation of the maintenance personnel, such that the operation of the maintenance personnel is convenient, and the problem of the inconvenience in the maintenance caused by the small maintenance space of the conventional valve tower for the converter valves is solved.

The invention discloses a lithium ion power battery pack balanced discharge management system, which comprises an MCU central control unit, a voltage, current and temperature monitoring module for monitoring battery information, a balanced discharge module, a battery radiating module, a battery module and a high voltage power bus. The voltage, current and temperature monitoring module feeds monitored information back to the MCU central control unit; and after the monitored information is analyzed by the MCU central control unit, the operation of the battery radiating module and the balanced discharge module is controlled, and the battery module discharges through the high voltage power bus in a balanced way, wherein the balanced discharge module consists of a plurality of resistances and a plurality of analogue switches; each battery in the battery module is connected with the resistances and the analog switches; the resistances are used for distributing the current of the batteries; and the analog switches are used for controlling the operation of the resistances. The lithium ion power battery pack balanced discharge management system has the advantages of accurate control of the balanced discharge, higher safety and support of heavy-current discharge.

The invention discloses a device for wiping glass. The device for wiping glass comprises two adhesive discs respectively provided with a lifting mechanism which is used for making the adhesive disc being close or keeping away from the glass; two lifting mechanisms are connected through a feed mechanism and used for changing the horizontal distance of two adhesive discs; the upper parts of two adhesive discs are respectively provided with a rotating mechanism, which is used for rotating the adhesive disc along the vertical direction; a liquid injection mechanism is arranged for injecting the clear water or washing liquid; a wiping mechanism is arranged at the bottom of the adhesive disc and used for wiping the glass; each adhesive disc is connected with a vacuum generator and the adhesive disc is absorbed to the surface of the glass; a monitoring unit comprises a negative pressure sensor arranged in the adhesive disc, and a gravity sensor and a collision detector arranged outside the adhesive disc; a control unit is used for controlling the device for wiping glass for working according to the preset program and the monitoring signal feedback of the monitoring unit; the conventional work mode for manual operation of prior art is replaced by the device for wiping glass.

The invention relates to a method for detecting the mixed gas density of single beam and multi wavelengths in the mine and relative device, belonging to the optical gas detecting technique. Wherein, selecting electric modulated (AT89C52) low-temperature heat radiate infrared electric light source (2); selecting the range of special gas density inversion formula of double wavelength method according to the detecting accuracy; filtering light (16, 17, 18, 15) that using detected gas characteristic adsorption peak wavelength and the non-adsorption wavelength as the filter wavelength; calculating math average on the light strengths of several points at the rising edge of each module period of filter light; using k=6.21713*10-6 to correct the self excursion of light source power; calculating the mixed gas explosion limit and the dangerous degree; the invention comprises a stabilize power source (ADP200), opening gas chamber (12), collecting processing circuit (9), temperature and zirconia sensor (6, 10) and dew-remove clean element (4). The invention can real-time detect variable dangerous gases, densities under mine, with high sensitivity, accuracy and quick response. And it can match present detecting system to process continuously analysis and automatic control.

The invention relates to a seal (20) for cooking appliance comprising a vessel terminating at its upper part by a flange (4) and a tub lid (5), said seal having a heel (21) from which extends at least a first lip comprising a support surface terminating in an end edge (24) intended to rest on the flange (4) of the vessel, said seal being characterized in that the first lip is pierced at least one through opening (25) such that the said first lip may flow towards the heel (21) when the pressure in the cooking chamber exceeds the predetermined threshold so as to place said at least one through opening (25) in communication with the outside of the enclosure so that the end edge (24) still rests on the flange (4) of the vessel. The invention also relates to food pressure cooking appliances.

The present invention discloses a PID resistant device for a solar photovoltaic component using a non-isolated inverter. The device comprises a direct current power supply, a grounding switch, a diode, a timer and a control circuit. The PID resistant device of the present invention is able to automatically apply a positive to-earth direct current close to an open-circuit output voltage value of the solar photovoltaic component between the cathode at the voltage output of the solar photovoltaic component when the solar photovoltaic component is at a night inactive state, thereby counteracting the influence caused by the fact that the cathode at the voltage output of the solar photovoltaic component is at a negative voltage in the daytime, and realizing the suppression of PID phenomenon and performance recovery for the solar photovoltaic component and achieving the restoration of polarization effect generated in the daytime; furthermore, when the solar photovoltaic component is at an electricity generation state at the day time, the grounding switch 6 is automatically opened so as to effectively prevent the PID resistant device of the present invention from influencing the normal operation of the solar photovoltaic component.

An exercise device includes an upright post extended upwardly from a base, a pair of connecting members pivotally coupled to the upright post with an axle, two wheels rotatably attached to the axle, two lower brake arms and two upper brake arms pivotally attached to the upright post and each having a brake shoe for engaging with the wheels, a bar engaged with the free ends of the lower brake arms, and a follower engaged with the free ends of the upper brake arms and adjustable toward and away from the bar for adjusting a resistive force of the brake shoes onto the wheels and for adjusting the resistive force to the swinging movement of the handles and the elliptical movement of the foot supports.

The present invention discloses a burr eliminating circuit which comprises a delay module which is used for detecting the width of the burr and a delay output module for eliminating the burr problem generated in specific condition. The delay module is connected with a feedback control circuit module. The delay module controls the feedback control circuit module to reset with an accelerated speed when the burr is detected and sets with an accelerated speed when the valid data is detected. The circuit of the invention totally satisfies the functions of determining and eliminating the burr and can expands the width of the valid narrow pulsewidth signal to a safe width for securing the safe operation.

The invention discloses a driving circuit of a silicon-carbide semiconductor field-effect transistor. The driving circuit comprises a PWM control circuit, a driving signal amplifying circuit, an opening circuit, a turning-off circuit, a gate current-increasing circuit and a voltage change rate control circuit. With the gate current-increasing circuit, the driving current is increased during the opening process of the SiC MOSFET and the rising of the gate-source voltage of the SiC MOSFET is accelerated, so that the opening speed of the SiC MOSFET is increased. With the voltage change rate control circuit, the Miller capacitance between the SiC MOSFET drain and gate is enhanced and the SiC MOSFET drain-source voltage change rate is reduced, so that the current spike during opening of the SiCMOSFET is reduced. After the SiC MOSFET drain-source voltage does not change, a voltage control switch is turned off to avoid the SiC MOSFET false conduction caused by the crosstalk, so that the safeoperation of the SiC MOSFET is ensured.

The invention discloses an online monitoring system for deformation of a transmission line tower material. The online monitoring system comprises a measurement and analysis module, a wind speed and direction sensor, a monitoring center and a plurality of wireless acceleration sensors arranged at different positions of a transmission tower. The wind speed and direction sensor, the monitoring centerand the plurality of wireless acceleration sensors are connected with the measurement and analysis module. The wireless acceleration sensors are installed at 15 key positions of the transmission tower, and are used to measure the vibration acceleration at these positions. The real-time monitoring of the deformation of the transmission line tower material is realized, guarantee is provided for thesafe operation of a transmission line, and the safety hazards of the operation of the tower are reduced. The invention also discloses an online monitoring method for deformation of a transmission line tower material, the method including firstly performing system installation and arrangement, then carrying out data acquisition and pre-processing, next, further analyzing and processing the pre-processed data in the monitoring center, and determining whether the state of the tower structure is normal according to the change of the obtained modal parameters.

The invention relates to a solar pumping irrigation system. The solar pumping irrigation system is characterized by comprising a solar panel array, a control cabinet, a vanadium battery pack, an inverter, a soft starter, a solar pumping inverter, a control device, a high-lift water pump, an impounding reservoir, and a sprinkler plant, wherein the solar panel array is connected with the solar pumping inverter, a change-over switch and the high-lift water pump in series; meanwhile, the solar panel array is connected with the control cabinet, the vanadium battery pack, the inverter, the starter, the change-over switch and the high-lift water pump in series; the high-lift water pump is connected to a mountain reservoir through an upper water pipe and a check valve, and then connected with a sprinkler gun through a lower water pipe. The solar pumping irrigation system is suitable for being popularized and applied to villages in remote and mountain areas and power shortage areas.

The invention discloses a power distribution box with self-adaptive function, which comprises a box body and a box door hinged with the box body, a cooling fan is arranged in the box body, several groups of ventilation devices are arranged in the box body, and the ventilation device includes an upper block plate; the upper baffle includes an upper support portion and an upper shielding portion, the side wall of the box is provided with an upper vent that can be blocked by the upper shield, and the side wall of the box at the upper vent is provided with a The upper chute of the upper part, the upper shielding part is slidingly connected with the upper chute; the lower end of the upper supporting part is connected with an airbag, and the airbag expands to push the upper shielding part to move upwards along the upper chute to open the upper vent. A photosensitive sensor for light intensity, and the controller controls the speed of the cooling fan according to the light intensity sensed by the photosensitive sensor. The invention can solve the problem that the current distribution box cannot automatically adjust heat dissipation according to the external environment.

A large-power LED street lamp power supply circuit system is characterized in that the large-power LED street lamp power supply circuit system comprises an LED power supply controller unit, an LED power supply unit, an LED street lamp bead array unit, a wireless communication module and a temperature sensor. An adjusting method is an intelligent control method based on an expert rule algorithm of an LED life mechanism model, and an LED array temperature prediction model unit and an expert rule unit of the LED life mechanism model. The system and the method have the advantages that reasonable illumination is realized, electric energy is saved, safe working of LED street lamps is ensured, and the failure of the LED and the relatively short service lifetime, which are caused by overheating, are prevented.

The invention discloses a field emulsion explosive mixing and charging system and charging method suitable for underground engineering. The drug outlet of a mixing machine is connected with the drug inlet end of a drug conveying pump; the drug outlet end of the drug conveying pump is communicated with a drug conveying hose through a water ring adding device; a mixing shaft is arranged in the drug mixing cavity of a mixing machine shell; a premixing chamber is formed above the feeding hole of the mixing machine shell; a drug spray device is arranged at the drug outlet end of the drug conveying hose; a spray head of the drug spray device has a cylindrical structure; and the spray head is provided with a main drug spray hole along the axial lead of the spray head. The aim of ensuring the explosion effect is fulfilled mainly through technical innovations on three aspects: I, the pre-mixing chamber is formed on the top of the mixing machine shell; II, the sensitizing way of the emulsion explosive is physical sensitization; and III, the drug spray device is additionally arranged at the upper end of the drug conveying hose. Meanwhile, specific to the aim of lowering the working pressure of the drug conveying pump, a shearing device arranged on the drug conveying hose and used for increasing the viscosity of the emulsion explosive in the prior art is eliminated.

The invention discloses a device and method for online monitoring the looseness of bolts on a transmission tower. The device is characterized in that it comprises a front-end monitoring device, a 4G communication module and a monitoring center which are connected successively; the front-end monitoring device comprises a piezoelectric acceleration sensor, a conditioning circuit and an Xbeepro s2c module which are connected successively; a wind speed and direction sensor is connected with the Xbeepro s2c module; the Xbeepro s2c module is connected to the 4G communication module. The intrinsic frequency matrix of an iron tower member is calculated by the monitoring center, and is compared with an intrinsic frequency matrix where no bolt looseness happens and obtained by modal analysis, thus,the bolt looseness of the transmission tower is determined. The invention also discloses a method for online monitoring the looseness of bolts on a transmission tower, which solves the defect of the traditional manual line inspection, realizes the on-line monitoring of the loosening of the bolts of the transmission line, and reduces the safety hidden troubles of the tower operation.

The invention discloses a net cover structure of an engineering air bag. The movable net cover structure is formed by longitudinal hanging bands 2 and transverse hanging bands 5. The transverse hanging bands 5 penetrate through inner holes of rubber pipes 4 and fixing holes in the longitudinal hanging bands 2 to realize even distribution and limiting, on the circumference of a bag body, of the longitudinal hanging bands 2 in the circumferential direction. The two ends, located on the air bag 1, of each longitudinal hanging band 2 are provided with hanging lugs, the other end of each longitudinal hanging band 2 is located in the middle of the bag body and longitudinal tensioning of the longitudinal hanging bands 2 is realized by winding rope 5 in a crossed mode. The net cover structure can be fixedly bonded on an air bag with any diameter, and multi-point bearing binding of lateral floating force when the air bag is placed horizontally and single-point bearing binding of axial floating force when the air bag is placed longitudinally are realized. The net cover structure can be installed, disassembled and transported on the air bag easily, and the problem that floating-assisting binding cannot be conducted on large-diameter air bags is solved. The net cover structure is reasonable in stress, improves the construction safety, is high in reutilization rate, reduces construction investment and has wide application prospects in the fields such as ocean engineering construction and boat fishing.

The invention provides a welded IGBT and solderless diode-based series structure module, which belongs to the field of power electronics semiconductor device application. The module comprises a radiator, a solderless diode and welded insulated gate bipolar transistors (IGBT), wherein a plurality of welded insulated gate bipolar transistors (IGBT) are connected in series, and the solderless diode is pressed between two adjacent welded insulated gate bipolar transistors (IGBT), the welded insulated gate bipolar transistors (IGBT) are connected in series by way that the emitting electrode of the first IGBT module is connected with the collecting electrode of the next IGBT module by a low-induction conductor, and the solderless diode is parallelly connected between the collecting electrode and emitting electrode of the IGBT module for free-wheeling and protection. The welded IGBT and solderless diode based series structure module of the invention has the advantages of well solving the problem that the open circuit fails generated in the series connection application of the IGBT, and providing a new technical path for the practicability of the series connection application of the IGBT.

The all-rotation towboat rudder paddle control system includes central processing unit, steering handle, handle rotating signaling potentiometer, handle rotating coder, signal amplifier, signal poweramplifier, proportional electromagnetic valve, hydraulic element, rudder blade, rudder blade feedback signalling potentiometer and feedback rotating coder. It is characterized by that it adopts AMD80188ES embedded microprocessor as central processing unit, the input end of said microprocessor is equipped with RS 485 interface. Said microprocessor is connected with flash memory of storage control software and electrically-erasable programmable read-only memory for storing control parameters, and two serial ports of said microprocessor have a RS232 interface.

The invention discloses a battery state monitoring method, an edge processor, a system and a storage medium. The method comprises: receiving real-time running data, collected by a battery management system, of a battery and calculating battery state data by the battery management system according to the real-time running data and a battery model; correcting parameters of the battery model according to the real-time running data and the battery state data to obtain corrected parameters; on the basis of the real-time running data, verifying the corrected parameters; and after successful verification, returning the corrected parameters to the battery management system, verifying the corrected parameters again by the battery management system, and updating the corrected parameters to the battery model after successful verification again to monitor the battery state by using the updated battery model. Therefore, the accuracy of the battery model is ensured; and the working state of the battery can be monitored accurately by using the battery model, so that the safe operation of the battery is guaranteed.

The invention belongs to the technical field of conveyor protection devices and particularly relates to a belt conveyor protection device for a coal mine. The belt conveyor protection device for the coal mine comprises a core mine intrinsic safety type programmable logic controller and a signal detection unit connected with the programmable logic controller. The signal detection unit comprises sensors and amplified phones. The sensors comprise the coal piling sensor, the mine smoke sensor, the speed detection sensor, the mine temperature sensor, the mine belt deviation sensor and the mine intrinsic safety type longitudinal tear sensor. The amplified phones comprise the mine intrinsic safety type sudden stop amplified phone, the mine intrinsic safety type pull rope sudden stop amplified phone A and the mine intrinsic safety type pull rope sudden stop amplified phone B. The belt conveyor protection device for the coal mine has the advantages that programming can be conducted on site, the number of input / output points can be increased, work is reliable, operation is convenient, expansion is flexible, the design is flexible, protective functions are complete, display information is abundant, and control interlocking and protection functions of related devices can be achieved reliably and conveniently.