125results about How to "Realize automatic protection" patented technology

The invention discloses a method for carrying out overload protection on equipment in a POE system. The method comprises the following steps: A, configuring the priority for each port supporting power over Ethernet (POE) of power supply equipment (PSE), and setting a threshold power; B, detecting the real-time power of the PSE, judging whether the real-time power is larger than the threshold power, and executing step C if the real-time power is larger than the threshold power; and C, cutting off the power supply at the PSE ports in an ascending order based on the priority until the real-time power is equal to or smaller than the threshold power. By setting the priority for each port of the PSE equipment, and cutting off the power supply at the PSE ports in the ascending order based on the priority when the PSE is overloaded, the invention prevents the PSE end equipment from being overloaded, and ensures the power utilization of the important PD equipment as much as possible, realizes the automatic protection set by the PSE, further reduces the equipment damage probability, and enhances the accessibility and the reliability of the equipment.

The invention discloses a vision protection method. The vision protection method comprises the following steps of: monitoring time of a human face continuously facing an electronic display device; judging the relationship of the sizes of the time of the human face continuously facing the electronic display device and a preset threshold; and triggering a preset vision protection functional operation when the time is larger than or equal to the threshold. The invention further provides a vision protection system, wherein the vision protection system can monitor the time of the human face continuously facing the electronic display device and the distance between the human face and the electronic display device and carries out a certain protection measure when the time or the distance is close to the threshold, so that the electronic display device has the functions of preventing nearsightedness and protecting vision health, can automatically protect eyes of a user and avoids of the nearsightedness or the increase of nearsightedness degree due to incorrect usage of the eyes when the user uses the electronic device.

An intelligent motorcar body network system comprises a semaphore input module, a front motorcar lamp module, a rear motorcar lamp module, a CAN / LIN gateway module, an electric window module, a wiper module, a central lock module and a rearview mirror module. The present invention applies both CAN and LIN buses for networking, realizing the distributed layout of a network, wherein the front motorcar lamp module, the rear motorcar lamp module, the semaphore input module and the CAN / LIN gateway module are connected together via the CAN bus to construct a network, along with which a motorcar power CAN network forms a large network, and the electric window module, the wiper module, the central lock module, the rearview mirror module and the CAN / LIN gateway module are connected together via the LIN bus to form a LIN network. The present invention is connected with the upper-layer CAN network by means of the CAN / LIN gateway module to perform information interaction. The present invention realizes the functions of information interaction with the motorcar power CAN bus, power supply management, etc. and reduces cost and cabling difficulties.

The invention discloses a privacy protection implementing method and device. The method includes: according to a command entered by a user, acquiring the type of target privacy data of a target contact to be protected; according to feature data of the target contact, searching for target privacy data matching with the feature data and belonging to the data type; subjecting the target privacy data to privacy setting. The feature data is used for identifying the target privacy data of the target contact. In this way, the privacy protection implementing method and device allows the different types of privacy data of the target contacts to be self-protected, and operating is simple and convenient.

The invention discloses an automatic fault protection method for a bulldozer, which comprises the followings: acquiring operational parameters of the bulldozer in real time; making a comparison between the operational parameters and a pre-set value, judging whether the operational parameters meet the pre-set value or not, if not, making a comparison between the operational parameters and date stored in a fault database, and determining corresponding fault grades and fault codes; generating corresponding control signals to control an engine according to fault grades. The invention further discloses an automatic fault protection system for the bulldozer. According to the invention, in the case of faults on the bulldozer, the fault grades can be determined according to the data stored in the fault database, and corresponding control to the engine can be performed according to corresponding fault grades. Therefore, automatic protection to the bulldozer can be achieved.

The invention relates to a vehicle-ground integrated operation safety protection system and method. In the process that on-site operators carry out operation on a railway, accurate position information of the operators is obtained through satellite differential positioning, train operation information is obtained through external vehicle-mounted equipment, signal state information of a station yard is obtained through an interface for connection with an external TDCS, comprehensive operation processing is carried out by combining the accurate position information of the operators, the train operation information and the signal state information of the station yard and basic data, then operation safety protection information is output and transmitted to the on-site operators and the systemvehicle-mounted equipment through mobile wireless communication network / GSM-R network, and the on-site operators stop operation and get off for avoidance in time when receiving early warning information or alarm information. The system has the following advantages that accurate positioning of the on-site operators, automatic identification and alarm of collision between an on-site operation area and an approach train route, vehicle-ground integrated linkage protection and remote operation assistance are realized, and personal safety protection under single-person or multi-person operation on site is effectively achieved.

The invention relates to a selective crusher for underground use, which comprises a supporting stand, a supporting roller mechanism and a revolving drum body, wherein the supporting roller mechanism is arranged on the supporting stand, and the revolving drum body is horizontally installed on the supporting roller mechanism through a rolling ring which is arranged around the drum body and is matched with a supporting roller in the supporting roller mechanism; the inner cavity of the roller is provided with a pre-screening section, a pushing and screening section, a crushing and screening section and a discharge section sequentially backwards from the feed end, wherein a pre-screening section discharge opening is arranged below the pre-screening section, and a discharge chute is arranged below the crushing and screening section; a center shaft which is coaxial with the roller and is driven by a power source to rotate is installed in the roller, a beater plate is arranged on the shaft body of the center shaft at the section matched with the pre-screening section, a rotor in the shape of an oblique tooth is arranged on the shaft body of the center shaft at the section matched with the crushing and screening section, and a spiral discharge auger is arranged on the shaft body of the center shaft at the section matched with the discharge section; and a plurality of axially arranged lifting plates and nail plates are installed on the inner wall of the screening drum of the crushing and screening section at intervals.

The invention provides a control and protection device, with the power supplied by the complementation of wind and light, of an aeration oxygenation machine, relates to the environment protection field and in particular to an oxygenation aeration water quality purifying device technology in the environmental engineering subject. The device is characterized by consisting of a wind driven generator, a solar panel, a rectifying device, a protection switch, an AC contactor, an inspection switch, a storage battery, an inverter, a DC monitor, a storage battery low-voltage protection contact and a storage battery overvoltage protection contact. The positive effects brought by the implementation of the invention are: the use of the complementation system of wind and light for power supply solves the problem that energy can not be supplied stably in a single power generation and supply process by either wind energy or solar energy, saves coal energy; realizes the auto starting function of aeration equipment and automatically accumulates the working time of the aeration equipment; realizes the auto protection function against insufficient battery voltage caused by excessive electricity consumption of the aeration equipment and excessive saturation of batteries caused by excessive electricity generated by wind and light and ensures the long-term safe and stable work of the equipment.

The invention relates to the field of air startup of diesel engines, in particular to an air startup protection device of a diesel engine. On a control air course of the air startup protection device of the diesel engine, a first reversing valve is arranged in front of a manual valve serving as a start button; or the first reversing valve is arranged between the manual valve serving as the start button and a starting valve; and a second reversing valve is arranged between the first reversing valve and a manual valve serving as a parking button. After the diesel engine works normally, an air compressor outputs a path of compressed air to control the reversing valves to reverse, so that the manual valve (the start button) fails, tooth breakage caused by restart of an air motor due to error operation or damage of the manual valve is avoided, a gear or the air motor is prevented from being damaged, the problem of tooth breakage of the motor due to error operation is radically solved, and the air motor is better protected. The air startup protection device does not contain electric elements, so the device has simple principle structure. Moreover, the invention also discloses the air startup diesel engine comprising the air startup device.

The invention discloses a voltage reference circuit. On the basis of the conventional common band gap reference voltage source circuit structure, a fixed bias circuit and a starting and over-voltage protection circuit are arranged; monoploid bipolar transistor base emitter PN junction voltage VBE and diploid bipolar transistor base emitter PN junction voltage 2VBE are realized in the fixed bias circuit; comparison control between the bipolar transistor base emitter PN junction voltage and reference voltage output by a band gap reference voltage source is realized through the starting and over-voltage protection circuit, so the output reference voltage during the normal work of the band gap reference voltage source is defined in a safe range; when the output reference voltage is over-high,automatic protection of the circuit can be realized; and the circuit has a simple structure and is suitable to be manufactured by the various bipolar transistor and metal oxide field effect transistor compatible processes.

The invention discloses an operation mode of capacitance-adjusting type arc suppression coil complete device. A damping resistance is arranged at the secondary winding side of the arc suppression coil, so as to prevent a system from generating resonance under normal condition, when in single phase earth fault, a secondary damping resistance automatically exits, the capacitance-adjusting type arc suppression coil automatically compensates induced current, residual current at fault point is restricted to be in the required range; wherein the operation mode that presetting is combined with real time adjusting is adopted, so that impact to system which is caused by system compensation is less, thus being safe and reliable.

A long distance digital supersonic wave / variable frequency antiscale and descale equipment is provided, which is composed of an inductance power, a digital module, a digital crystal displayer, a supersonic power, a cable conductor, a transducer, a protecting cover, a ring piezoelectricity ceramic plate, a metal amplitude transformer, an engine body, a flange, a metal energy collecting block, a pipeline, a pipeline front flange, a rear flange, an inductance coil. Wherein, the supersonic wave engine and the pipeline have an ideal inclined angle range of 30 to 60 degree and are welded on the pipeline, the communication of the supersonic wave and the flow direction are same. As that, the invention in not only helpful to the communication of the supersonic wave and is not easy to produce standing wave and rejection wave, but also reduces the repeat shocking to the pipeline of the cavitation effect of the supersonic wave, thus prolonging the service life of the pipeline. A twist wire connected with multicircuit or variable frequency circuit board is winded on the industrial pipeline. The invention uses the cavitation effect of the supersonic wave to work on the dirt on the inner wall of the pipeline in lateral wave and vertical wave, which realizes the descaling of equipment, and the long and short distance in the pipeline, and procede variable frequency antiscale and descale to the pipeline fluid in distance by using variable frequency magnetic field. The equipment can remove furr in advance, but also can prevent forming dirt, which can make the longer pipeline provided with no furr producing condition, ensures the whole pipeline smooth. The invention saves water resource, improves equipment efficiency, reduces the maintaining cost and prolongs the service life of the equipment, which can realize digital controlling and automatic protection functions.

The invention relates to the field of coal mine roadway drifting mining transportation, in particular to an anti-explosion diesel engine automatic protection device of coal mine vehicles, which can solve the problems of the protection of the diesel engine in the process of using the anti-explosion diesel engines of underground coal mine special vehicles, and the like. The device comprises a sensor, an altitude valve, an air shut-off valve, an air shut-off air cylinder, a fuel shut-off air cylinder, a lubrication oil pilot operated valve, a two-position three-port air control valve, a shuttle valve, a two-position five-port air control valve, and the like, wherein the sensor is integrated with the air valve; the air valve and the altitude valve are connected with a pressure gas circuit behind the two-position five-port air control valve; the altitude valve is respectively connected with the air shut-off valve and the fuel oil shut-off air cylinder; the air shut-off valve is connected with the air shut-off air cylinder; the two-position three-port air control valve is connected with the pressure supply gas circuits of the two-position five-port air control valve, the shuttle valve, the pressure gas circuit, and the sensor; the lubrication oil pilot operated valve is connected with the two-position five-port air valve, the shuttle valve, the diesel engine and the pressure gas circuit. The invention can be used in the coal mine underground environment containing explosive gases.

The invention relates to the technical field of artificial intelligence, and discloses a sensitive data anti-peeping processing method, which comprises the following steps: detecting whether sensitivedata is displayed in an APP interface displayed on current terminal equipment; if yes, calling a camera of the terminal device to collect a current environment image in real time; processing the grayscale image of the current environment image, and identifying whether a plurality of users exist in the current environment image or not; if a plurality of users exist in the current environment image, performing face recognition on the current environment image by judging the texture features of the face image so as to recognize whether illegal users exist or not; and if an illegal user exists and sensitive data is displayed in the current APP interface, performing anti-peeping processing on the sensitive data based on a sensitive data protection strategy. The invention further discloses a sensitive data anti-peeping processing device and equipment and a computer readable storage medium. An illegal user can be prevented from peeping sensitive information of others, and then the security of sensitive data display of the user is improved.

The invention relates to an electric heating device based on a communication platform. The electric heating device comprises an indoor temperature detecting device, a box body, a heater and a remote controller, wherein the heater is connected with the box body by a pipeline; the box body and the temperature detecting device are in remote communication connection with the remote controller by a network. The electric heating device provided by the invention can realize intelligent control on electric heating, can realize constant-temperature heating and is high in heating speed, high in efficiency, long in service life and capable of automatically controlling the temperature so as to realize automatic protection such as electric leakage prevention, high temperature prevention, burning prevention and freezing prevention; moreover, the heating time can be set as needed, so the aim of saving electricity and energy is realized.

The embodiment of the invention provides a garage door protection method suitable for an FAO system. The method comprises the steps: judging whether a target garage door meets a control triggering condition of a command for opening and closing the target garage door or not if the command, transmitted by a TIAS, for opening and closing the target garage door is received; if yes, a garage door opening and closing instruction is output to an executing mechanism of the target garage door so as to drive the executing mechanism of the target garage door to execute a control action corresponding to the target garage door opening and closing instruction on the target garage door; and judging whether the target garage door is in a state after the control action corresponding to the command of opening and closing the target garage door is executed or not, if not, judging whether driving is overtime or not, if yes, sending garage door action overtime alarm information to the TIAS, and otherwise,returning to the step of outputting a garage door opening and closing command to an executing mechanism of the target garage door. According to the embodiment of the invention, potential safety hazards possibly caused by manually controlling the garage door can be effectively avoided, and the garage door control operation efficiency is improved.

The invention provides a high-speed filtration and high-temperature and high-pressure squeezing and drying flexible pipe typed solid / liquid processing device; during the filtrating process, a piston slag scraper is used for removing the filtrated slag remained on the filter medium and replace a compressor and a filter machine at the same time; during the squeezing process, the solid / liquid separation is completed by a squeezing principle of changing volume of a filter chamber; the volume of the filter chamber can be near zero after the volume is changed; high pressure pump can not be needed to convey the raw material and additional squeezing water pump systems or squeezing air systems are not required to be taken as the filter pushing force of a press-filter; the mechanical pushing force is large and the pressurizing is quicker; repeated nipping filtration can be adopted; the washing filter slag is dipped; during the squeezing process, the alternative change of the thickness of the raw material improves the filtration speed, the washing speed and the efficiency; the humidity of a filter cake is uniform; the filtration and squeezing can be carried out at the same time when the vacuum or steam drying is carried out; the production quantity of each sequence batch is easily changed according to the requirement of production capability; the washing regeneration of the filter medium is automatically completed; the slag drainage is automatically completed; during the production process, automation can be completely realized, the energy dissipation is reduced and the production efficiency is high.

The invention provides an electrolytic tank and an automatic protecting system and a method for the electrolytic tank. The automatic protecting system for the electrolytic tank comprises a switch unit, a circuit parameter detecting unit, an electrolyte parameter detecting unit and a control unit. The switch unit is connected with a circuit formed of an anode and a cathode of the electrolytic tank and a power source, the circuit parameter detecting unit is connected in the circuit and used for detecting circuit parameters of the circuit, the electrolyte parameter detecting unit is mounted in the electrolytic tank and used for detecting electrolyte parameters, the control unit is connected with the switch unit, the circuit parameter detecting unit and the electrolyte parameter detecting unit and used for receiving the circuit parameters from the circuit parameter detecting unit and the electrolyte parameters from the electrolyte parameter detecting unit, respectively judging whether the received circuit parameters and / or the received electrolyte parameters meet conditions of switching off or not, and controlling to switch off the switch unit when the circuit parameters and / or the electrolyte parameters meet the conditions of switching off. Accordingly, the electrolytic tank can be kept safe automatically.

The invention provides a mounting structure of a straight retractable door combined with a retractable barrier. The barrier is arranged in a middle gap of the retractable door and is connected with a machine head of the retractable door, a barrier rod guiding wheel is fixed on an aluminum plate of the machine head, a barrier rod is disposed on guiding wheels, and the three groups of guiding wheels are driven by a motor to rotate via a conveying belt so that the barrier rod is driven to extend and retract. The barrier rod is provided with an induction magnet which is used for sensing persons or vehicles so as to control actions of the barrier rod. The mounting structure of the straight retractable door combined with the retractable barrier realizes convenience in combination and installation of the retractable barrier and the retractable door, is low in cost, convenient in use and safe in running, can stop suddenly when encountering resistance, and automatically protects the barrier rod.

The invention relates to a flexible tube side-by-side series connection high-speed high-pressure pressing and dryness solid-liquid treatment device. In filtration, a traction mechanism is utilized for pulling a piston scraping residue plate so as to remove the filter residue cut off by a filter medium, and a concentrator and a filter are simultaneously replaced; when pressing, the theory of transfiguration and pressing of a filter chamber is utilized for finishing solid-liquid separation, the filter chamber can approach to zero after the capacity is varied, a pressing water pump system or a pressing compressing air system does not need to be equipped additionally as the filter driving force of the pressure filter, mechanical driving force is larger, and pressure is increased quickly; repeated massage filtration can be adopted, filter residue is soaked and washed, when pressing, the alternative change of thickness of the raw material improves the filter speed, washing speed and efficiency; the degree of wetness of the filter cake is even; filtration and pressing can be carried out simultaneously in vacuum or steam dryness; according to demands of production ability, the amount of production of each order can be changed easily; washing and regeneration of filter mediums can be finished automatically; residue slagging can be finished automatically; complete automation during production can be realized, energy consumption is lowered, and the production efficiency is higher.

The present invention discloses a system for implementing elastic permanent virtual connection and its method. The system includes successively-connected data layout module, elastic PVC module, signalling module and route module. It also provides the function of the above-mentioned every module, and said invented method is characterized by that the headend VPI and VCI values and terminal end VPI and VCI values are loaded into wideband high-layer information unit or wideband low-layer information unit, and the transparent transmission can be made in intermediate node so as to create the elastic permanent virtual connection.

The invention discloses an electric mower capable of realizing automatic protection and lawn reseeding. The mower comprises a vehicle body, a detection mechanism is arranged at the right part of the vehicle body, the detection mechanism comprises a detection vertical chute arranged in the vehicle body, a detection vertical spring is fixedly arranged on the inner wall of the upper side of the detection vertical chute, a detection sliding block is fixedly arranged at the lower end of the detection vertical spring, and the detection sliding block can slide up and down in the detection vertical sliding groove. According to the lawn mower, automatic protection and lawn reseeding of the lawn mower can be realized; when encountering stone and other obstacles, the mower can automatically bypass the obstacles by means of a poking wheel, and meanwhile, the mower can automatically move around the obstacles to prune surrounding lawns; and meanwhile, whether the lawns are damaged or not can be automatically detected through friction force, and when the mower finds that some part of the lawns are damaged or withered, reseeding can be automatically conducted.

Disclosed is a wall-mounted switch. Tilting action of a lever (16) is transmitted to a movable contact (25) on a spindle (26) through a small support (18), a slider (17) and a connecting shaft (29) to drive the movable contact (25) to complete open and close action. A free trip device comprising a snap catch (27) and a lock catch (28) can also be arranged on the wall-mounted switch, and functions of earth leakage protection, short-circuit protection and overload protection are realized by cooperation of various trippers arranged beside the lock catch and a detection circuit. An operating mechanism is arranged on one side of a switch center, so that enough wiring space and radiating space of a load end can be reserved for arrangement of essential devices for making and breaking large load on the condition of small-size standard household switch, or enough space can be reserved for arrangement of test buttons on a panel, a test circuit inside, indicating lights and the like when a socket is used as an output device, and therefore, the wall-mounted switch is light, attractive and convenient.

The invention belongs to the field of safety protection of a coal bed gas drilling machine, and relates to a safety protection system, in particular to a safety protection system for a coal bed gas drilling machine engine. The system is provided with a combustible gas sensor, a poisonous gas sensor, a rotating speed sensor, an acousto-optic alarm lamp, a controller, a scram switch and an electromagnetic turn-off valve. The combustible gas sensor and the poisonous gas sensor are installed at the portion of a vehicle-mounted drilling machine construction orifice, and the rotating speed sensor is installed on a flywheel of the engine or an electricity generator; after the electromagnetic turn-off valve is installed on an engine air filter, the controller, the acoustic-optic alarm lamp and the scram switch are integrated together and installed on a drilling machine control console, and all the components are communicated through a circuit. According to the safety protection system, the purpose of safety protection of an engine in the coal bed gas exploitation and development process can be achieved, prejudgment protection, emergent turn-off and safety shutdown of risk working conditions of the engine can be achieved, and therefore equipment and personnel safety can be guaranteed.

An automatic rain and snow protective cover used for a handlebar and a saddle of a sharing bicycle comprises a rain and snow sensing system, a mechanical operation system, a protective cover system, apower system, a guaranteeing system, a controller and a support. The automatic rain and snow protective cover used for the handlebar and the saddle can accurately judge rainy and snowy weather in time and can automatically protect the handlebar and the saddle of the sharing bicycle on rainy and snowy days. The automatic rain and snow protective cover used for the handlebar and the saddle can effectively solve the problem that rain and snow remain on the surfaces of the handlebar and the saddle of the sharing bicycle after the rainy and snowy days, the surfaces of the handlebar and the saddleof the sharing bicycle are prevented from being stained by muddy water generated by rain and snow, normal use of the sharing bicycle is achieved, development of a green travel habit is further facilitated, and environment protection is facilitated.

The invention belongs to the technical field of electronics and discloses a protection circuit and a switching power source. The protection circuit comprises a detection module, a short-circuit feedback module, a driving control module and a power source switching module; the power source switching module is connected with the primary winding of an external power source module; the acquisition endof the detection module is connected with the secondary winding of the external power source module; the output end of the detection module is connected with the input end of the short-circuit feedback module; the detection module is used for detecting the voltage signal of the secondary winding of the external power source module and outputting the voltage signal to the short-circuit feedback module; the output end of the short-circuit feedback module is connected with the input end of the driving control module; the short-circuit feedback module is used for preprocessing the voltage signaland outputting the preprocessed voltage signal to the driving control module; the driving control module is used for controlling the power source switching module to be turned off when the received voltage signal is lower than a first preset voltage value. With the protection circuit of the invention adopted, the automatic overcurrent or short circuit protection of each output branch is realized,and devices are not damaged. The protection circuit has the advantages of low cost and convenient maintenance.

The invention discloses an automatic weft protection device for shutdown of an air-jet loom. The automatic weft protection device for shutdown of the air-jet loom comprises an air-jet loom control system, an air-jet loom body, a main spraying and weft insertion mechanism, an air compressor and a weft accumulator. The air-jet loom control system is used for sending a start signal and a shutdown signal to the air-jet loom body and the weft accumulator. The air-jet loom body is connected with the air compressor through a crank-link mechanism. An air delivery passage is arranged between the air compressor and a main spraying and weft insertion mechanism. A solenoid valve is arranged on the air delivery passageway, and opening and closing of the solenoid valve are controlled by the air-jet loom control system. The air delivery passageway is divided into a supply air channel and a residual air discharge branch after passing through the solenoid valve, the supply air channel is connected with a main spray nozzle of the main spraying and weft insertion mechanism, and the residual air discharge branch is communicated with the outside atmospheric environment. The automatic weft protection device for shutdown of the air-jet loom is compact in structure, high in automation degree and capable of automatically protecting wefts when the air-jet loom is shut down.

The invention discloses an electrical fire monitoring and early-warning method based on anintegration algorithm and a device, which comprises steps: S1 residual current of an electrical loop is detected; S2 the residual current is integrated for time to obtain a residual current integral parameter; S3 the voltage and the load current of the electrical loop are obtained; S4 electrical fire hidden trouble situations of the electrical loop are monitored and early-warmed according to integral parameters of various time periods; S5 the electrical fire hidden trouble situations of the electrical loop are alarmed and controlled according to the detection results of the residual current, the voltage and the load current; S6 the temperature on presupposed positions in the electrical loop is detected; and S7 an overtemperature integral parameter is obtained when the temperature is bigger than a setting threshold. The electrical fire monitoring and early-warning method based on the anintegration algorithm and the device are beneficial to check in hadden troubles in time in early stage by monitoring the residual current integral parameter, the redidual current, the voltage, the load current, the temperature and the overtemperature integral parameter and particularly monitoring the residual current integral parameter and the overtemperature integral parameter, and prevent the problem that electrical fire hidden troubles are not found in time.

The invention discloses a fiber laser mode stability monitoring device and method. The monitoring device comprises a photoelectric detector, a filter, an attenuator and a control circuit, wherein a detection end of the photoelectric detector is used for being arranged in a cladding light stripper so as to receive cladding light stripped from an optical fiber by the cladding light stripper; the filter is arranged on the outer side of the detection end and used for filtering pump light in the cladding light; the response wave band of the photoelectric detector comprises a signal light wave band;the attenuator is arranged on one side of the filter and used for attenuating the signal light so as to enable the power of the signal light to be below a saturation threshold of the photoelectric detector; and the control circuit receives an electric signal detection value of the signal light output by the photoelectric detector, acquires a continuously changing current value of a driving powersupply, judges whether the mode of the fiber laser is in a stable state or not, and disconnects the driving power supply of the fiber laser when the judgment result is that the mode is unstable. The monitoring device is low in cost and capable of guaranteeing high sensitivity in the monitoring process.