47results about How to "Reduce the possibility of security incidents" patented technology

The invention discloses a functional copper foil based on graphene and a preparation method thereof. The functional copper foil based on graphene comprises a copper foil and a material coating containing graphene. The functional copper foil with the surface uniformly coated with a graphene mixed material is used to replace a copper foil as a lithium ion battery anode current collector, the lithium storage characteristic of graphene is utilized, the foil exposure phenomenon of the current collector in the process of coating the battery material is eliminated, the safety accident incidence during usage of a lithium ion battery is reduced, the integral safety of the lithium ion battery is improved, and the electric conductivity and the heat radiation performance of a lithium ion battery electrode are improved. The provided functional copper foil based on graphene eliminates the foil exposure probability during electrode preparation, and improves the integral safety of the battery. Also, the preparation method of the functional copper foil based on graphene is simple, and easy for realizing industrialization and continuous production.

The invention discloses mobile equipment, a processing method thereof for limiting using of a driving mode and a storage medium. The method comprises the following steps of: inspecting and judging whether the mobile equipment is on a started car or not and judging whether the movement speed exceeds a predetermined threshold value or not; when the mobile equipment is on the started car and the movement speed exceeds the predetermined threshold value, carrying out control to start a front camera and a rear camera to periodically detect shot pictures in a range so as to judge whether the mobile equipment is in the cab; and when the mobile equipment is in the cab and is currently operated, carrying out prompt to prohibit the use of the mobile equipment, and when the prompt exceeds a predetermined time, carrying out control to prohibit the use of applications except the navigation. According to the method, a new function of limiting the using of the driving mode is added to the mobile equipment, so that the driving mode can be prevented from using the mobile equipment such as mobile phone tablets in the running process and the possibility of accidents is reduced.

The invention provides a method for producing a detonator explosive ignition head. The method comprises the following processes of: 1, upwards fixedly placing an ignition head explosive cavity on an operating table; 2, adjusting an explosive injection cartridge or the operating table so that the cartridge is positioned right above a cavity shell and aims at an ignition bridge wire; 3, adjusting an explosive injection head or the operating table so that the explosive injection head descends to the explosive cavity; and 4, starting an extrusion device to extrude an ignition agent, and injecting the agent into the explosive cavity so that the agent fully wraps the ignition bridge wire; and finally, extracting the explosive injection head to complete the production. The invention also provides an explosive ignition device for implementing the method, which comprises the operating table, the explosive injection cartridge, the explosive injection head, the extrusion device and an explosion-proof device for isolating a person and the operating table. A fixer on the operating table fixes the ignition head on the operating table, the extrusion device can hermetically connected with the explosive injection cartridge through an air pipe, and the explosive injection cartridge is hermetically connected with the explosive injection head. According to the technical scheme, automatic production of the explosive ignition head can be realized.

The invention discloses an internal bracing demolition construction method based on BIM (Building Information Modeling). The method comprises the following steps of creating a uniform modeling standard according to a drawing and a construction surrounding environment, and importing the two-dimensional drawing into BIM software so as to build a three-dimensional basement structure model and an internal bracing structure model; determining a bracing demolition scheme and simulating the bracing demolition scheme through the BIM software; carrying out bracing demolition stress change analysis in force analysis software, and utilizing pictures and animations of the BIM model for disclosing the scheme for construction personnel; carrying out internal bracing demolition on a construction site according to the simulated bracing demolition scheme. According to the internal bracing demolition construction method based on BIM provided by the invention, information of the internal bracing demolition scheme can be effectively transmitted.

The invention relates to a novel frost-free helmet which comprises a helmet body, an electrothermal wire, a power supply, a heating switch, an infrared emitter and an infrared switch. The helmet is characterized in that the electrothermal wire is arranged in a windshield on the helmet body; the power supply and the heating switch are arranged on the helmet body; the power supply is connected with the heating switch and the electrothermal wire through wires, and therefore, if people turn on the heating switch when riding a motorcycle on cold day in winter, the windshield on the helmet body can be prevented from being frosted; and furthermore, the infrared emitter is also arranged on the windshield on the helmet body, the infrared switch is arranged on the infrared emitter, and therefore, people can see surrounding things clearly at night by turning on the infrared switch when riding a motorcycle. The novel frost-free helmet is simple in structure and easy to manufacture.

The invention belongs to the field of automobile parts and relates to a dustproof heat dissipation type reversing camera. The camera comprises a shell and a camera which are fixedly mounted at the bottom of a vehicle; a protective cover is rotationally connected into the shell; the protective cover is arranged in a barrel shape; the front end of the protective cover extends out of the shell; the camera is mounted in the protective cover; the camera is rotationally connected with the inner side wall of the shell through a connecting rod; the inner side wall of the shell is fixedly connected with a dust removal brush attached to the surface of the protective cover; a horizontally-arranged wing plate is arranged below the shell; the upper surface of the wing plate is in an upwards-protrudingarc shape; the lower surface of the wing plate is in a horizontal line shape; a rack is fixedly connected to the upper end of the wing plate; and the upper end of the rack extends into the shell and is fixedly connected with the inner top face of the shell through a spring. Dust on the surface of the protective cover can be automatically brushed away, normal shooting of the camera is guaranteed, meanwhile, the cooling and heat dissipation speed of the camera can be increased, and the service life reduction caused by high temperature is avoided.

The invention discloses a safety production information sharing method based on a block chain technology, and belongs to the technical field of safety production information sharing. The safety production information sharing method is characterized in that an enterprise end is provided with information managing equipment and information publishing equipment; through the information managing equipment, the type and safety management information of an enterprise are input, and the information managing equipment uploads the safety management information to a block chain module; through an intelligent contract of the block chain, the uploaded safety management information is classified, the safety management information of the corresponding type is sent to the information publishing equipmentof the enterprise of the corresponding type, and the safety management information is publicized; the block chain module saves the safety management information uploaded through a distributed information account book. The problems are solved that in transmission sharing of existing production safety information, resource enterprise information easily leaks, and the transmission information has asymmetric lag; the enterprise can timely receive the safety management information in the field, and the leakage of the enterprise information in the information sharing process is reduced.

The embodiment o the invention discloses an automobile equipment adjusting method and device, and relates to the field of electronic techniques. The automobile equipment adjusting method and device are used for automatically conducting adaptability adjustment on automobile equipment. The method includes the following steps of collecting fingerprint information of a user, and judging whether the collected fingerprint information is matched with stored fingerprint information; storing the fingerprint information of the user if the collected fingerprint information is not matched with the stored fingerprint information, and memorizing adjustment of the user on the equipment; automatically adjusting the equipment according to memorized equipment adjustment of the user if the collected fingerprint information is matched with the stored fingerprint information; and judging whether new adjustment of the user on the equipment needs to be memorized if the user newly adjusts the equipment after the equipment is adjusted, memorizing the new adjustment of the user on the equipment if the new adjustment needs to be memorized, and not memorizing the new adjustment otherwise. By means of the automobile equipment adjusting method and device, adaptability adjustment on the automobile equipment can be automatically conducted, and the possibility that safety accidents are generated due to the fact that the automobile equipment is not adjusted in time is lowered.

The invention relates to automobile parts, and discloses a fuel tank cap lock for a car. The fuel tank cap lock for the car comprises a lock cylinder component (1), wherein a locking component (3) is arranged on the lock cylinder component (1), the locking component (3) comprises a locking ratchet wheel (301), a locking paw (302), a lock sleeve (304) and a reset torsional spring (303), at least one boss (3011) is arranged on the locking ratchet wheel (301), the locking paw (302) attaches to the boss (3011), the locking paw (302) is arranged in the lock sleeve (304), a fixture block (3041) is arranged on the lock sleeve (304), and the lock sleeve (304) is further internally provided with the reset torsional spring (303); when the fixture block (3041) and the locking paw (302) are clamped, the lock cylinder component (1) is unlocked, when the locking ratchet wheel (301) rotationally pushes the locking paw (302), the reset torsional spring (303) drives the fixture block (3041) to break away from the locking paw (302), and the fixture block (3041) drives the lock cylinder component (1) to rotate through the lock sleeve (304). The fuel tank cap lock for the car has the effects of being convenient to use, and being capable of automatically locking, and lowering potential safety hazards.

The invention belongs to the technical field of solid rocket engines, and relates to an electromagnetic mechanical safety type solid rocket engine igniter. An electromagnetic mechanical safety deviceis arranged in a fuel gas ignition channel, between an ignition tube and an ignition powder cartridge, in the igniter, the electromagnetic mechanical safety device is controlled by an electric signalto control the fuel gas ignition channel to opened or closed, safe ignition control of the igniter is achieved, it is ensured that even if an ignition system ignites by mistake, ignition of the wholeignition device cannot be caused, the safety factor is greatly improved, the possibility of a safety accident is reduced, electrified control over the mechanical safety device is further improved, andthe igniter is safer and more convenient to use.

The present invention particularly relates to a vehicle safe traveling method and system. The method comprises the following steps: collecting audio data in a normally traveling vehicle; judging whether the audio data meet a preset condition, if so, executing a step 3, if not, maintaining the normal traveling state of the vehicle; generating a safe traveling signal and sending the signal to a vehicle control system, so as to drive the vehicle control system to control the vehicle to adopt a preset safe traveling scheme. According to the invention, the audio data in the normally traveling vehicle are collected to judge whether the driver is in the normal traveling state, namely, whether the driver is arguing with others and whether the driver is excited, after the driver is found to argue with others, the vehicle control system is automatically driven to control the vehicle to travel in a safer way, so that the safety of the driver, passengers and passers-by is ensured, and the possibility of accidents is reduced.

The invention relates to an operation board control device capable of achieving automatic power off. The operation board control device comprises a box body, card plug-in cases, an operation board and outer interfaces. A plurality of card plug-in cases are arranged on the front side of the box body, each card plug-in case is provided with a plurality of plug-in slots, and the back side of the box body is provided with a plurality of outer interfaces corresponding to the card plug-in cases on the front side. A plurality of powering-off devices are connected in series and connected with the outer interfaces. A sliding mechanism comprises a horizontal slide block, a horizontal slide way, a horizontal cushion block, a longitudinal slide way, a longitudinal cushion block, a connecting rod, spring pads and a push rod. The horizontal cushion block with the spring pad and the horizontal slide block are arranged in the horizontal slide way in sequence, the longitudinal cushion block with the spring pad and the push rod are arranged in the longitudinal slide way in sequence, and two ends of the connecting rod are respectively and movably connected with the horizontal slide block and the push rod. The operation board control device has the advantages of achieving the automatic power off without the operation board, fundamentally achieving the possibility that the device can not be operated again without the operation board and reducing the possibility of safety accidents caused by errors.

The invention provides an aluminum diethylphosphinate flame retardant, which contains a telomer as shown in a structure I, in which R1 = CnH2n + 1, n = 1, 2, 3, 4, 5, 6, 7 or 8, R2 = CnH2n + 1, n = 1, 2, 3, 4, 5, 6, 7 or 8, and n = 1, 2, 3, 4, 5, 6, 7 or 8. R2 is phenyl.

The invention relates to the field of construction safety protection, in particular to a protective safety helmet with a remote communication function and a safety management method. The protective safety helmet comprises a safety helmet body, an information collection module, a first voice communication module, an early warning module and a communication module, and the information collection module, the first voice communication module, the early warning module and the communication module are arranged on the safety helmet body; the information acquisition module is used for acquiring current position information and construction site environment information; the communication module is used for communication between other modules and the back-end management platform; a back-end management platform comprises an information analysis module, a display module and a second voice communication module; and an information analysis module performs analysis processing according to the current position information and the construction site environment information, judges whether the site is safe or not according to an analysis result, and sends alarm information to the communication module if the site is not safe. According to the scheme, the construction safety can be better guaranteed, the construction process is monitored in an all-around mode, remote guidance is achieved, constructors are reasonably scheduled, and the construction quality can be conveniently controlled.

The invention belongs to the field of power grid automation control, and particularly relates to a network security protection method suitable for a high-frequency emergency control system. The high-frequency emergency control system comprises a control main station, a management system and an execution station. The method comprises the following steps: carrying out network security protection oncommunication information transmitted on the management system and a communication link which are in communication connection with the control main station; wherein the communication link comprises the communication link between the management system and the control main station and the communication link between the execution station and the control main station. The embodiment of the invention provides a network security protection method suitable for a high-frequency emergency control system. Omnibearing network safety protection of the high-frequency emergency control system is realized, the possibility of power grid safety accidents caused by network invasion or hacker attack of the high-frequency emergency control system in the related technology is greatly reduced, and a safe operation environment is provided for the high-frequency emergency control system.

The invention provides a step-by-step pressure reduction method of three-phase fluid as well as a design method and an application thereof. The three-phase fluid flows through at least pressure-reducing valves of two stages for completing pressure reduction, in order to separate light components; the pressure of the three-phase fluid before a first pressure reduction is equal to or higher than 15MPa, and the pressure of the three-phase fluid after the last pressure reduction is equal to or lower than 5MPa; contents of gas phase, liquid phase and solid phase in the three-phase fluid are equal to or high than 1wt%. The pressure drop range of each stage is reduced by the step-by-step pressure reduction method, so that degrees of expansion type wearing and cavitation type wearing of equipment and valves are directly and greatly reduced; especially the reasonable pressure reduction range is optimally and further designed, so that medium flows more stably when the pressure drop range is reduced, wearing brought by solid-phase friction is greatly reduced, service life of pressure-reducing valves is prolonged, and possibilities of apparatus shutdown and accident appearance are reduced.

The invention discloses a vehicle anti-lock control system and slip ratio vibration suppression method based on an LQG controller. By designing a brake torque threshold control unit, the output braketorque range output by a brake anti-lock control unit is subjected time-varying limiting, and the brake torque threshold control unit is composed of front and rear road surface adhesion coefficient estimation units, front and rear wheel ideal brake torque estimation units and front and rear wheel brake torque constraint units. The brake torque range is limited in the following control steps that 1, the front and rear road surface adhesion coefficient estimation units estimate front and rear road surface adhesion coefficients; 2, the front and rear wheel ideal brake torque estimation units determine front and rear wheel ideal brake torques through the polynomial fitting relation between the road surface adhesion coefficients and the brake torques; 3, upper and lower limit thresholds of thefront and rear wheel brake torques are set, so that the brake torques output by the LQG controller are subjected to limit constraint of the upper and lower limit thresholds, and then actual control signals of the brake torques output by the brake anti-lock control unit are obtained.

The invention discloses a novel forklift. The novel forklift comprises a car body, the car body comprises front wheels, rear wheels and a control chamber, the control chamber is internally provided with a seat and a workbench, and the car body is internally provided with a garbage can and a water tank. A supporting frame a and a supporting frame b is arranged in front of the car body, the supporting frame a and the supporting frame b are fixedly welded to the car body, a connecting frame is fixedly connected to the top end between the supporting frame a and the supporting frame b, a bearing plate is arranged at the bottom end between the supporting frame a and the supporting frame b, a base is arranged at the bottom of one side of the bearing plate, and the base is connected with a bearingplate. A supporting platform is arranged above the base, the base is connected with the supporting platform through a lifting assembly, a driving device is arranged in the base, the driving device isconnected with the lifting assembly, and a pallet fork is fixedly connected to the upper part of the supporting platform. The novel forklift can fork and load cargos directly and then lift the cargosto perform high altitude operations, the conditions of the cargos can be observed in real time, meanwhile, a workshop or the floor can be further cleaned, and the work efficiency of the forklift is improved.

The invention belongs to an anchoring force monitoring method and device and relates to a real-time monitoring method and device of anchoring force of double-plate anchor bolt. The method comprises: welding five short columns between two plates, including a hollow column in the middle and four centrosymmetric solid columns around, and each column is axially and centrosymmetrically provided with four strain gauges, a Wheatstone full-bridge circuit is formed, and a strain gauge arrangement direction is along the axes of the columns. A current column surface strain value is acquired by a strain bridge circuit, and a controller computes anchor bolt anchoring force according to current axial strain values of the columns and controls a display instrument and an alarm to send out corresponding indicative signals; in the device, a double-plate structure, a strain bridge, an analog digital converter, the controller, the display instrument and the alarm are connected in order. The monitoring method and device is low in cost, simple and easy to use, easy to popularize and apply, capable of monitoring anchor bolt anchoring force accurately in real time, and capable of sending a warning in case that the anchoring force is insufficient or overloaded, effectively reducing the occurrence likelihood of coal mine safety accidents.

The invention discloses a safety production information sharing method based on block chain technology, which belongs to the technical field of safety production information sharing. The category and safety management information of the information management device uploads the safety management information to the block chain module; through the smart contract of the block chain, the uploaded safety management information is classified, and the corresponding type of safety management information is sent to the corresponding type of The enterprise's information release equipment releases safety management information; the blockchain module stores the uploaded safety management information through the distributed information ledger; it solves the problem of information leakage and dissemination of resource enterprises that are prone to occur in the dissemination and sharing of existing production safety information There is a problem of asymmetry and lag in information; it can allow enterprises to receive safety management information in this field in a timely manner and reduce the leakage of enterprise information during the information sharing process.

The invention discloses a backward air inlet fuel cell stack. The fuel cell stack comprises flat plate-shaped membrane electrode assemblies and pole plate assemblies, wherein the pole plate assemblies comprise an oxygen flow field plate, a hydrogen flow field plate and a cooling flow field plate, and the oxygen flow field plate and the hydrogen flow field plate are the same in structures; and the fuel cell stack is formed by stacking the membrane electrode assemblies and the pole plate assemblies repeatedly. Two gas inlet and outlet closed areas and an active reaction closed area on the front faces of the oxygen flow field plate and the hydrogen flow field plate are all surrounded by closed bosses. Each membrane electrode assembly comprises an active reaction area positioned in the middle and a boundary area arranged on the periphery of the active reaction area; and four groups of backward air inlet and outlet through holes are formed in the boundary area. According to the backward air inlet fuel cell stack provided by the invention, a backward air inlet function is realized, the pile sealing reliability can be improved further, the possibility of triggering safety accidents after cell overheating combustion can also be reduced, and the backward air inlet fuel cell stack is higher in practicability.

The invention relates to the technical field of an electric short-circuit protection device, in particular to a multifunctional fireproof short-circuit protector with a redundant device. The multifunctional fireproof short-circuit protector comprises a switch power supply, a current sampling device, a digital signal processor, a large-current power module, an isolation driving module, a redundant device, a charge absorption circuit and a load; the redundant device is a controlled mechanical switch, and an end L of an alternating-current power 220V is respectively connected with a resistor R1, the input end of the switch power supply, the input end of a differential amplifier and one end of the current sampling device. The multifunctional fireproof short-circuit protector is used in different alternating-current strong current fields such as household power, industrial power and the like, when the load is short-circuited, the abnormal power supply circuit is disconnected instantaneously at a microsecond speed, and no dangerous spark is produced on the short-circuit position; when the abnormal situation such as electric leakage happens in an electrical loop, the electric-leakage circuit is also disconnected at a high speed by the device; through the redundant device, even when the extreme situation that the large-power current module or the digital signal processor is abnormal occurs, the reliability of the device also can be guaranteed.

The invention discloses an evaluation device for fan point location risk and an evaluation method. The evaluation device comprises a fan tower drum state monitoring device, a fan blade state monitoring device, a central computing device, a movable video monitoring device and a high-risk article monitoring device, and the fan tower drum state monitoring device is arranged in a fan tower drum of a fan unit; the fan blade state monitoring device is arranged in fan blades of the fan unit; the movable video monitoring device is arranged in a to-be-selected area of a wind power plant; the high-risk article monitoring device is mounted on a high-risk building or article near the to-be-selected area of the wind power plant; and the central computing device is respectively connected with the fan tower drum state monitoring device, the fan blade state monitoring device, the movable video monitoring device and the high-risk article monitoring device through a communication device. The wind power plant site selection risk can be effectively judged, and the evaluation device can assist an early-stage investigation team of a wind power plant developer in determining a wind power plant site selection point location, and helps the wind power plant developer to select a safe wind power plant site.

The invention discloses a helicopter deck hanger bolt hole plugging structure. The structure comprises a plugging piece and a fixed piece, and the plugging piece comprises a plugging part penetratingthrough and being arranged in the hanger bolt hole, and a limit part clamped and arranged on an aluminum antiskid surface; the plugging part comprises a cylindrical section and a circular truncated cone, a top end of the cylindrical section is fixedly connected with a lower bottom surface of the limit part, diameter of the cylindrical section fits the diameter of the hanger bolt hole, and a bottomsurface of the limit part completely cover an upper top surface of the cylindrical section; a bottom end of the cylindrical section is fixedly connected with one end, having relatively bigger cross section, of the cylindrical section; the limit part, the cylindrical section and the circular truncated cone are coaxially arranged; the upper top surface of the limit part is provided with several fixed pieces to fix the plugging piece on the aluminum antiskid surface; and waterproof layers are respectively arranged in the hanger bolt hole, on the limit part and on a sidewall of the cylindrical section. The helicopter deck hanger bolt hole plugging structure provided by the invention can effectively plug the hanger bolt hole so as to prevent dirty oil and rainwater from entering into an orlopdeck, and thus, possibility of occurrence of safety accidents is reduced.

The invention provides chain processing equipment, and relates to the field of processing equipment. The chain processing equipment comprises a box body, wherein a partition plate, a discharge box, a support and an ejector rod are fixedly installed in the box body; a gear is rotatably installed at the bottom of the support; a rotating assembly, a left-right adjusting assembly, a guide shaft and two traction shafts are rotatably installed in the box body; an up-down adjusting assembly is arranged in the box body, and the up-down adjusting assembly and the left-right adjusting assembly are both attached to the rotating assembly; a center shaft is arranged in front of the up-down adjusting assembly; and a square plate is fixedly installed on the front surface of the center shaft. Through cooperation of the rotating assembly, the left-right adjusting assembly, a pushing assembly, the discharge box and the like, automatic discharging and two-time automatic pushing of bars can be achieved, meanwhile, automatic leading-out of the processed chain is achieved, and workers do not need to discharge to take parts for multiple times, so that the labor burden of the workers is relieved, and the possibility of safety accidents is also reduced.

The invention relates to the field of office supplies, and particularly discloses office quick-drying glue and a preparation process thereof. The quick-drying glue is prepared from the following raw materials in parts by weight: 2-20 parts of an emulsifier, 50-150 parts of styrene, 200-500 parts of acrylate, 50-350 parts of vinyl acetate, 2-10 parts of an initiator, 1-5 parts of a pH buffering agent and 350-550 parts of water. The preparation process comprises the following steps: S1, preparing an emulsion; S2, performing a polymerization stage; and S3, carrying out post-treatment; and the office quick-drying glue is obtained. According to the quick-drying glue disclosed by the invention, styrene, acrylate and vinyl acetate are selected as monomers, so that the solid content can be effectively improved, the addition amount of water is reduced, and the drying speed of the water in the finally obtained glue is reduced, and therefore, the solidification speed of the prepared glue is high,and the paper bonding time is finally reduced.

The invention relates to the technical field of organic synthesis, and particularly discloses a method for continuously synthesizing O-ethyl-S-sec-butyl thiophosphoryl chloride. The preparation method comprises the following steps: respectively and continuously adding a chlorinating agent, an organic solvent and di-sec-butyl disulfide into a tubular reactor for chlorination reaction to obtain a sulfur chloride intermediate; then, the sulfur chloride intermediate is in contact with chlorinated diethyl phosphite which is continuously introduced, an oxidation reaction continues to be carried out, concentration is carried out, and an O-ethyl-S-sec-butyl thiophosphoryl chloride product is obtained. By adopting continuous reaction, the problem of solvent chlorination is effectively reduced, the content of solvent chloride in the final product is reduced to 0.02% or below, the product quality is effectively improved, recycling of the reaction solvent is facilitated, the hazardous waste treatment cost is reduced, the economic benefit and the environmental benefit are relatively high, the market competitiveness of enterprises is improved, and the method has a wide application prospect. And the method has extremely high popularization and application values.

The invention provides a crawling ladder for maintenance. The crawling ladder comprises a first longitudinal beam, a second longitudinal beam and a plurality of crossbeams, wherein at least one crossbeam is a safety protecting beam, each safety protecting beam comprises a safety transverse rod, a transverse rod sleeve sleeving the safety transverse rod, a support and a sensor, one end of the support is connected with the first longitudinal beam, the first end of the safety transverse rod is rotatably connected with the other end of the support through a rotary shaft, a retaining block in slide fit with the inner wall of the transverse rod sleeve is arranged on the outer surface of the second end of the safety transverse rod, an elastic telescopic part is arranged between the retaining block and the bottom plate of the transverse rod sleeve, a mounting hole is formed in the second longitudinal beam, the sensor is arranged at the mounting hole, a mounting shaft is arranged on one side, away from the retaining block, of the bottom plate, and the mounting shaft penetrates the mounting hole to be abutted against the telescopic probe of the sensor. The crawling ladder for maintenance has the advantages that maintenance staff can be well protected and possibility of safety accidents is lowered greatly.

The embodiment of the invention provides a safety early warning method and a wearable device, relates to the technical field of electric power safety, and aims to reduce hidden dangers of operators during electric power engineering construction. The safety early warning method provided by the embodiment of the invention is applied to the wearable device comprising a physical sign detection unit. The safety early warning method comprises the following steps: acquiring physical sign indexes of an operator wearing the wearable device by using the physical sign detection unit; determining physical state information of the operator based on the physical sign indexes; determining task information of the operator; determining whether the physical state information of the operator is matched with the task information, and sending out first warning information if the physical state information of the operator is not matched with the task information; determining the distance between the operator and an electrified body; determining whether the distance between the operator and the electrified body is smaller than a safety distance or not, and sending out second warning information if the distance between the operator and the electrified body is smaller than the safety distance.

The invention belongs to the technical field of solid rocket motors, and relates to an igniter of an electromagnetic mechanical insurance type solid rocket motor; in the invention, a set of electromagnetic mechanical insurance is placed in the gas fire transmission channel between the ignition tube and the ignition cartridge in the igniter, The opening and closing of the gas fire transmission channel is controlled by the electric signal control electromagnetic mechanical insurance, which not only realizes the safety control ignition control of the igniter, but also ensures that once the ignition system ignites by mistake, it will not cause the entire ignition device to ignite, which greatly improves the safety factor. , reduce the possibility of safety accidents, and further realize the electrification control of the mechanical safety device, which is safer and more convenient.