47results about How to "Protection from burns" patented technology

Embodiments of the invention provide a detection method, a detection device and a charger. On one hand, the detection method comprises steps that in a process of supplying power to a terminal by a charging line via a charging circuit, voltages at two ends of a sampling resistor are detected, wherein the sampling resistor is positioned on the charging circuit; then according to the voltages at the two ends of the sampling resistor, whether a foreign matter exist at a charging interface or not is determined, wherein the charging interface is positioned between the charging circuit and the terminal; and if the foreign matter exist at the charging interface, power supplying to the terminal is stopped. Therefore, the technical scheme provided by the embodiments of the invention solves a problem in the prior art that a charger and a terminal are burned out as whether foreign matters exist at a charging interface of the terminal and a charging line interface of the charger or not cannot be automatically detected.

The invention discloses a composite flame retardant and a preparation method thereof. The composite flame retardant is characterized by being formed by mixing and reacting a chitin compound, a phytic acid compound, acetic anhydride, siloxane, polyamine, white carbon black, urea and water, wherein the chitin compound is at least one of chitin or chitosan; the phytic acid compound is at least one of phytic acid, sodium phytate, potassium phytate, magnesium phytate, calcium phytate, iron phytate, cobalt phytate or zinc phytate. Preparation method of the flame retardant mainly relates to a three-stage mixed reaction process: firstly, uniformly mixing the chitin compound, the phytic acid compound, water, polyamine and white carbon black; then adding acetic anhydride and siloxane to be uniformly mixed; and finally, putting urea to be uniformly mixed, and discharging, cooling and crushing the mixture to obtain a product. The composite flame retardant disclosed by the invention not only can effectively retard flames of polyolefin and woods, but also has good compatibility with polyolefin and an amino resin aqueous coating, and can effectively avoid phenomena of blooming, white spraying, dialyzing and fracturing.

The invention relates to a renal sympathetic nerve removing radiofrequency ablation electrode and system. The renal sympathetic nerve removing radiofrequency ablation electrode comprises a first electrode and a second electrode which are opposite in polarity. The two electrodes with the opposite polarities can effectively control the current flowing direction and range, and the radiofrequency ablation energy is concentrated, so that the renal sympathetic nerve on the outer wall of the renal artery blood vessel is burnt out accurately, unwanted injuries to organs and tissues outside the target treatment range are avoided, and the advantage of small destructiveness is achieved. Besides, as the radiofrequency ablation energy is concentrated, the renal sympathetic nerve on the outer wall of the renal artery blood vessel can be burnt out accurately and rapidly, the operating time is shortened greatly, and postoperative recovery of patients is facilitated.

The invention discloses an optical module lighting power control system and a control method therefor. The control system comprises a signal receiving unit, an illuminating unit, an illuminating power detection unit, an isolation unit, an amplification circuit, a current detection unit, a temperature detection unit, a feedback unit, a current control unit and a control unit. The beneficial effects of a technical solution of the optical module lighting power control system and the control method therefor are that intelligent control can be realized according to characteristics of each type of laser device, that output lighting power stabilizes within a 0.5 dB variation range at high and low temperatures of -40 to 85 DEG C can be ensured, working efficiency is greatly improved, the laser device can be prevented from being burnt out, the performance of the laser device can be assessed, service life of the laser device can be determined, early warning can be given in advance, and the laser device can be effectively protected from being burnt out due to excessive currents.

The invention discloses a preparation method of a graphene-based waterborne epoxy resin emulsion. Raw materials comprising, by weight, 10-15 parts of modified graphene, 3-5 parts of an emulsifier, 35-50 parts of epoxy resin, 5-10 parts of polyethylene glycol, 120-150 parts of propylene glycol monomethyl ether, 20-30 parts of deionized water, 1-2 parts of boron trifluoride and 1-3 parts of a leveling agent are weighed. The modified graphene has a physical barrier effect, when the emulsion is used for paint film combustion, heat transfer and combustible gas volatilization can be reduced, a carbon layer can be formed, a matrix is protected against combustion, and the emulsion is endowed with excellent flame retardant property; and the method solves the technical problem that graphene has super-strong Van der Waals' force and conjugation force, is easy to form a three-dimensional structure and has poor dispersibility in organic phase and aqueous phase solvents.

The invention discloses a diabetic foot care device. The device comprises a shell body, a washing device and a physiotherapy device. The shell body is divided into a physiotherapy washing zone and a placing zone, wherein the physiotherapy washing zone is arranged at the upper end of the interior of the shell body, a wash basin is arranged in the physiotherapy washing zone, a drainage hole is formed in the center of bottom of the wash basin, and an electronic valve is arranged on the drainage hole, the placing zone is arranged at the lower end of the interior of the shell body, a waste water collecting box is arranged at the front end of the lower portion of the placing zone, and the waste water collecting box is connected with the drainage hole through a water guiding pipe; a control device and a power supply are arranged at the rear end of the lower portion of the placing zone. The feet of a diabetic have neurasthenia, and unnecessary damage of a patient during nursing can be effectively prevented by the diabetic foot care device; meanwhile, the foot acupoint therapy is adopted to work simultaneously with the electromagnetic therapy, physiotherapy and nursing are performed on thepatient, and the treatment effect is particularly significant.

The invention relates to an optical pulse detection and protection circuit for a fiber laser, which comprises an optical pulse signal amplifying circuit, a comparison circuit and a monostable trigger circuit. The optical pulse signal amplifying circuit is connected with the monostable trigger circuit through the comparison circuit, the monostable trigger circuit changes charge-discharge time of amonostable trigger chip by setting the resistance value of a programmable potentiometer under different frequencies through a single chip microcomputer, accordingly, whether compared optical pulse digital signals are normal or not is detected, and the monostable trigger circuit outputs TTL (transistor-transistor logic) low level if the optical pulse digital signals are abnormal, and outputs TTL high level if the optical pulse digital signals are normal. The single chip microcomputer detects output signals of the monostable trigger circuit, and a power supply is immediately turned off once thesingle chip microcomputer detects that the monostable trigger circuit outputs the TTL low level, so that iridium-doped fibers are protected from excessive burnout. The optical pulse detection and protection circuit functions in protecting the pulse laser in real time, so that the pulse laser can be effectively prevented from failing and burning the iridium-doped fibers.

The invention discloses a fireman uniform capable of making a fireman safely descend and relates to the field of firefighting. The fireman uniform capable of making the fireman safely descend comprises a coat and trousers. Braces fixed to the front side and the back side of the coat are arranged on the coat. The back side of the coat is provided with a rope bag connected with the braces. The front side of the coat is provided with an emission gun connected with the braces. A three-jaw hook is arranged in the emission gun. One side of the rope bag is provided with an opening for a rope to slide out. Two sleeves of the coat are each provided with a pulley. The rope penetrates the pulleys and is connected with the three-jaw hook.

The invention provides an electronic pressure switch, comprising casing and control circuit, where a seal ring is arranged in the casing and divides the casing into active cavity and water inlet cavity, not interconnected, the side of the seal ring is fixed with active pressure plate arranged in the active cavity, a spring is arranged in the active cavity, two ends of the spring act on the active pressure plate and the casing, respectively, and the control circuit is composed of power supply, starting sensor, stop sensor, CPU and manual switch, the signals received by the starting sensor and stop sensor are inputted into the CPU, which determines if to supply power to water pump after processing them, the active pressure plate is fixed with a pressure baffle which is arranged in the active cavity and at the starting sensor and stop sensor to change the signals received by the two sensors. And it is convenient to operate and has reliable performance.

The invention discloses an improved-type medium-voltage fireproof power cable, and the cable comprises a cable core. The cable is characterized in that the cable core is formed by the twisting of a plurality of insulating wire cores; a gap of the cable core is provided with an inorganic hydrous filling layer; the cable core is wrapped by a first low-smoke halogen-free flame-retardant glass fiber belt; the first low-smoke halogen-free flame-retardant glass fiber belt is wrapped by a ceramic silicone rubber isolating sleeve; the ceramic silicone rubber isolating sleeve is wrapped by a second low-smoke halogen-free flame-retardant glass fiber belt in an extruding manner; the exterior of the low-smoke halogen-free flame-retardant glass fiber belt is provided with a zinc-plated steel tape armored layer in a braided manner; and the outermost layer of the cable is provided with a low-smoke halogen-free flame-retardant external sheath or an aluminum sheath in an extruding manner. The cable can meet the requirements of electric performances and fireproof performances at the same time, is more reasonable in structure, is simple in manufacture technology, is reasonable in price, is long in service life, is high in safety, and is mainly used for urban buildings and common places where fire prevention is needed.

The invention discloses a pair-twist polyvinyl chloride insulated double-layer steel-tape armored polyvinyl chloride sheath power cable, and the power cable comprises a cable core. The cable core is formed by the twisting of a pair of insulating wire cores. The insulating wire cores respectively consists of a conductor, a polyvinyl chloride insulating layer wrapping the conductor in an extruding manner, and a multilayer tightening belt wrapping a cross-linked polyethylene insulating layer. An inorganic hydration filling layer is disposed in the gaps of the cable core, and the exterior of the cable core is provided with a heat tape. The exterior of the heat tape is provided with a first steel tape armored layer, and the exterior of the first steel tape armored layer is wrapped by a rubber and plastic inner sheath. The exterior of the rubber and plastic inner sheath is provided with a steel wire shielding layer, and the exterior of the steel wire shielding layer is provided with a mica flame-retardant tape. The exterior of the mica flame-retardant tape is provided with a second steel tape armored layer. Finally, the outermost layer of the cable is provided with a polyvinyl chloride external sheath in an extruding manner. The power cable is high in insulation reliability, is good in flame-retardant effect, is good in water-resistance effect, is resistant to cold, can prevent the damages to the animal and plant, and can improve the wear resistance.

The invention discloses cooling and washing equipment for high-temperature coal gas. The cooling and washing equipment is characterized by comprising a pressure bearing casing, wherein a washing water inlet and a synthesis gas outlet are formed in two sides of the pressure bearing casing respectively; a liquid discharge opening and a slug discharge opening are formed in the bottom; the upper part of the pressure bearing casing is a gasification chamber, and the bottom of the pressure bearing casing is a dreg pool; the lower side of the gasification chamber is connected with a water ejecting ring; the water ejecting ring comprises an outer water ejecting ring and an inner water ejecting ring; the washing water inlet is communicated with the inner water ejecting ring; an opening is formed in the upper side of the inner water ejecting ring; the inner water ejecting ring is communicated with the outer water ejecting ring through the opening; the lower side of the water ejecting ring is connected with a downcomer; at least one atomization nozzle is arranged on the outer side of the outer water ejecting ring at the position outside the downcomer. According to the invention, double-layer structure water ejecting rings which are communicated in the inner part are adopted, the requirement that the cooling water enters the downcomer from the inner layer is met, and the requirement of water supply for the atomization nozzle on the outer layer is met; the downcomer with the double ring wall structure can effectively overcome uneven distribution of the water film, and can effectively protect the downcomer from burning damage.

The invention relates to the technical field of firecracker dragons, in particular to a colorful lamplight firecracker dragon. The firecracker dragon is characterized by comprising a dragon head, a dragon body, a dragon tail and dragon claws; the dragon head comprises a dragon mouth, dragon eyes, dragon horns and dragon fins, and colorful lamps are arranged according to structures of the dragon mouth, dragon eyes, dragon horns and dragon fins; dragon bead and dragon teeth are arranged in the dragon mouth, colorful lamps are arranged on the round surface of the dragon bead, and colorful lamps are arranged on the dragon teeth; colorful lamps are arranged on the dragon fins; colorful lamps are arranged on the dragon body according to the direction of the dragon fins; the surface of the dragonbody is coated with a refractory coating; colorful lamps are arranged on the dragon tail according to the direction of each part of the dragon tail; circumferentially arranged colorful lamps are arranged at claw centers of the dragon claws; the colorful lamps are connected through circuits. The colorful lamps are arranged on the whole body of the firecracker dragon, so that the firecracker dragonhas the characteristics that the brightness and visual stereoscopic impression of the firecracker dragon can be increased, the firecracker dragon can resist to firecracker burning and explosion, theservice time of the firecracker dragon can be prolonged and the like.

The invention discloses a reinforced fire-resistant high-voltage cable, which includes a cable core. The cable core is formed by twisting three insulated wire cores; ‑1.5mm composite flame-retardant tape, the composite flame-retardant tape is extruded with a PVC inner liner with a thickness of 2.35‑4.75mm, and a soft water pipe with a thickness of 1‑2cm is arranged outside the inner liner, and a thick water pipe is provided outside the soft water pipe It is a metal armor layer of 3-6mm, and the metal armor layer is provided with a PVC outer sheath with a thickness of 2-4mm; the water supply hole and the water outlet hole are provided in the soft water pipe. The invention has the advantages of good flame retardancy, good strengthening performance, good self-supporting performance, good fire resistance, etc., and has the function of automatic cooling.

The invention belongs to the field of baked wheat cake processing and particularly relates to an efficient baked wheat cake machine. The efficient baked wheat cake machine comprises a shell and is characterized in that the center of an inner cavity contained by the shell is provided with a longitudinal rotating shaft, and a rotating disc is fixed to the rotating shaft; heating pipes are arranged in a cavity below the rotating disc; the bottom end of the rotating shaft is provided with a variable speed transmission box, and the variable speed transmission box is driven by an electromotor; the outer side of the shell is further provided with a numerically controlled panel which is connected with and controls the heating pipes and the variable speed transmission box; the shell is further provided with an inlet and an outlet communicated into the inner cavity; the outlet is provided with a collecting plate for collecting baked wheat cakes, the collecting plate is of a structure similar to the shape of L, the corner inner side of the collecting plate is hinged and fixed to the inner cavity wall, the tail of the collecting plate is tensioned and fixed to the inner cavity wall through a spring, and the top of the collecting plate is maintained to be tightly attached to the lower surface of the rotating disc all the time. The efficient baked wheat cake machine has the advantages that when the completely cooked baked wheat cakes on the rotating disc are rotated to the collecting plate, the collecting plate upwarps the baked wheat cake automatically, so that the collecting plate is separated from a rotating plate and slides to an outlet slideway, collecting work of the baked wheat cakes is finished, the efficient baked wheat cake machine is efficient and fast, and manpower is liberated.

The invention relates to an anti-springback device of a circuit breaker. The anti-springback device comprises a main shaft (11), a cantilever (1) welded on the main shaft (11), a limiting rod a (6) arranged below the main shaft for limiting a rotational position of the cantilever, a hanging plate (8) connected with the cantilever (1) by means of a rotating shaft b (7), and an assistance plate (4), wherein the assistance plate (4) is a bent plate and comprises a side plate a and the side plate b, and the assistance plate (4) is connected with the cantilever (1) by means of a rotating shaft a (5); in an initial state, the side plate a is located in front of the side wing of the cantilever (1); and in a switching-off state, one end of the hanging plate (8) is connected with the cantilever (1), and the other end of the hanging plate (8) is tangent to and compresses the limiting rod a (6). Compared with the prior art, the anti-springback device of the circuit breaker makes the anti-springback function more obvious, and plays the role of preventing springback and reducing springback, so that the springback of a moving contact in the switching-off process is reduced to prevent re-striking of electric arcs, thereby protecting the entire circuit against burning down.

The invention discloses a stable-structure flame-retarding power cable, which includes a cable core and a protective sheath which coats the outer side of the cable core. The protective sheath includes, by weight, 70-90 parts of nitrile butadiene rubber, 20-40 parts of chloroprene rubber, 20-30 parts of polyurethane rubber, 3-6 parts of a plasticizer, 20-30 parts of modified magnesium hydroxide, 10-20 parts of melamine phosphate, 40-50 parts of expanded graphite, 1-2 parts of a silane coupling agent, 2-4 parts of hydroxyethyl cellulose, 0.5-0.9 parts of chlorinated polyethylene, 1-2 parts of anantioxidant AT-215, 1-3 parts of an ultraviolet absorber UV-327, 1-2 parts of a photostabilizer 744, and 5-9 parts of a crosslinking agent. The stable-structure flame-retarding power cable has high density and high binding force, is further improved in flame-retarding performance, has very excellent mechanical performances, is balanced in flexibility and hardness and is not liable to fracture, and has good structural stability in the protective sheath.

This invention discloses a gas-proof gaseous ring used as the seal between piston and cylinder body of the internal-combustion engine. This gaseous ring includes the upper ring that shapes L and nether ring that is rectangle. The two rings have separate openings set up with 65- 75degree. Since the place of the openings is mutually staggered and stuffed, this eradicates air loss passage and lowers the air leakage so as to improve the mean effective pressure and the thermal efficiency. With the simple structure and low manufacturing cost, this invention makes voltage-sharing to the cylinder wall and reduces the abrasion of the cylinder which prolongs the life expectancy of the cylinder body.

The invention belongs to the field of clay oven roll processing, and particularly relates to an automatic electrical heating clay oven roll machine which comprises a shell. The automatic electrical heating clay oven roll machine is characterized in that a longitudinal rotating shaft is arranged on the central position of an inner cavity contained in the shell, and a rotating disk is fixed on the rotating shaft; a heating tube is arranged in an inner cavity below the rotating disk; a change gear box is arranged at the bottom end of the rotating shaft, and the change gear box is driven by a motor; a numerical control panel is arranged on the outer side of the shell, and the numerical control panel is connected with and controls the heating tube and the change gear box; an inlet and an outlet which are communicated with the inner cavity are formed in the shell. The automatic electrical heating clay oven roll machine has the advantages that the heating tube replaces traditional charcoal and coal baking, smoke and sulfur dioxide cannot be produced, and the environment is protected; the heating tube cannot product the smoke, contamination to clay oven rolls is avoided, and eating is healthy; meanwhile, the heating tube is controlled through the numerical control panel, the temperature in a pot is balanced, and the quality of the clay oven rolls is improved.

The invention discloses an electronic throttle valve which comprises a throttle valve body and a servo motor. The throttle valve body comprises an air throttle main body, a throttle valve shaft and athrottle valve main body. The position of the throttle valve main body can be changed by driving the throttle valve shaft, and the magnitude of the opening-closing angle of a channel of the air throttle main body is decided by the position of the throttle valve main body. The servo motor comprises a driver, an encoder and a motor body, the drivers controls the rotation angle of a motor, the motorbody directly drives the throttle valve shaft, and the encoder feeds back the actual rotation angle of the motor to a driving plate. According to the electronic throttle valve, the rotation angle of the throttle valve main body is directly driven by the servo motor, the throttle valve is composed of the servo motor and the throttle valve body, the structure is compact, and the size is small; during working, three-ring control specific to the servo motor is achieved so that the rotation position of the valve can be more accurately controlled, and the motor can further be protected against burning up by limiting the maximum current of the motor; and the control response speed of the electronic throttle valve is high, and the application range is wide.

The invention relates to an anti-springback device of a circuit breaker. The anti-springback device comprises a main shaft (11), a cantilever (1) welded on the main shaft (11), a limiting rod a (6) arranged below the main shaft for limiting a rotational position of the cantilever, a hanging plate (8) connected with the cantilever (1) by means of a rotating shaft b (7), and an assistance plate (4), wherein the assistance plate (4) is a bent plate and comprises a side plate a and the side plate b, and the assistance plate (4) is connected with the cantilever (1) by means of a rotating shaft a (5); in an initial state, the side plate a is located in front of the side wing of the cantilever (1); and in a switching-off state, one end of the hanging plate (8) is connected with the cantilever (1), and the other end of the hanging plate (8) is tangent to and compresses the limiting rod a (6). Compared with the prior art, the anti-springback device of the circuit breaker makes the anti-springback function more obvious, and plays the role of preventing springback and reducing springback, so that the springback of a moving contact in the switching-off process is reduced to prevent re-striking of electric arcs, thereby protecting the entire circuit against burning down.

The invention discloses a constant-temperature water discharging assembly facilitating mounting. The constant-temperature water discharging assembly comprises a water storage part, a constant-temperature control valve, a water changing valve, a water discharging nozzle and a shower head, wherein a hot water inlet is formed in the right end of the water storage part; a cold water inlet is formed in the left end of the water storage part; the water discharging nozzle and the shower head are arranged between the hot water inlet and the cold water inlet; a first inner cavity and a second inner cavity are formed in the water storage part; a connection pipe is arranged in the water changing valve; and the connection pipe and the cold water inlet relatively slide left and right through a sliding chute. The constant-temperature water discharging assembly is designed to enable cold water to enter from the left side and enable hot water to enter from the right side, so that the problem that the constant-temperature water discharging assembly can be still mounted even if a water entering pipeline is installed upside down is solved. The constant-temperature water discharging assembly can precisely adjust the temperature and save energy and water, can avoid the phenomenon that the water discharging temperature is affected by water pressure change and water flow change, and achieves the comfortableness during bathing; and furthermore, the constant-temperature water discharging assembly has a water temperature too-high protection function so as to protect children from being scalded due to sudden stop of the cold water.

The invention discloses an overcurrent latch-up protective circuit of a pumping laser. The overcurrent latch-up protective circuit comprises a current sampling part A, a sampling current analysis part B, a current adjusting part C, an overcurrent detecting part D and an overcurrent protection part E. The overcurrent latch-up protective circuit of the pumping laser has the advantages that the current sampling part, the sampling current analysis part and the current adjusting part are arranged, so that the current can be adjusted in real time, and the operation of the laser is more stable; and the overcurrent detecting part and the overcurrent protection part are arranged, so that the laser can be protected from being burned down when sudden high-current occurs.

The invention provides a stator and coil integrated liquid cooling electric eddy current speed retarder, which comprises a left stator and a right stator, wherein the left stator and the right statorare fixedly connected; then, a magnetic separation welding plate is arranged at the outside of the left stator and the right stator; a water inlet and a water outlet are formed in the outer side of the left stator; a cavity structure is formed inside the left stator and the right stator; a water passage is distributed in the cavity; a coil part is fixed in the cavity and a wire is led out in the side surface; the coil part separates the inside of the whole cavity into two circulation flow passages; the rotor part comprises a rotor tooth and a rotor support frame; the rotor support frame is arranged at one side of the rotor tooth; the rotor support frame performs coaxial rotation relative to the left stator; a gap is formed between the rotor support frame and the right stator; gaps are formed both between the rotor tooth and the left stator and between the rotor tooth and the right stator; the rotor support frame is connected to a rotating shaft through a magnetism isolation flange. Thestator and the coil integrated liquid cooling electric eddy current speed retarder has the advantages that the structure is simple; the processing is convenient; the cost is reduced; the magnetic path is simplified and the braking effect is improved.

The invention provides a device for improving the reliability of panel driving equipment. The device mainly comprises the following modules: an input power supply module for providing a working voltage, a control signal module for outputting a control signal to control the working state of liquid crystal display equipment, a voltage selection module for selecting a rated working voltage for a liquid crystal load, a voltage stabilization module, an overcurrent protection module and the liquid crystal load. The voltage stabilizing module receives a high / low level control signal output by the control signal module, can control an input working voltage to preferentially charge a delay capacitor at the moment of power-on, provides a certain power-on delay buffer time for a liquid crystal load, and prevents the liquid crystal load from being burnt out due to the increase of the instantaneous voltage; and the overcurrent protection module is used for detecting the working current of the liquid crystal load by using a sampling resistor and an operational amplifier, rapidly pulling down a control signal to GND when the current is too large, and rapidly closing the whole working device. The protection device has the advantages that the liquid crystal screen is effectively protected, equipment work is stabilized, the structure is simple, and cost is low.

The invention provides a flat single-phase pole-changing speed-regulating energy-saving motor, and relates to the field of energy-saving motors. The flat single-phase pole-changing speed-regulating energy-saving motor comprises a motor shell; a stator is installed on the inner side of the motor shell; a rotor rod is installed at the end penetrating through the motor shell; a rotor electric coil is installed on the outer side of the rotor rod; a first rotating shaft is installed on the outer side of one end of the rotor rod; the outer side of the first rotating shaft is fixedly connected with the motor shell; the rotor rod is movably connected with the motor shell through the first rotating shaft; a ventilation cover is installed at the end, away from the first rotating shaft, of the motor shell; and the rotor rod comprises a main core rod, a heat transfer groove is formed in the inner side of the main core rod, and a heat transfer assembly is installed on the inner side of the heat transfer groove. The problems that when the device works, only the same system can be used when objects with different weights are hoisted, so that the working efficiency is low in some time, and meanwhile, the loss of the device is increased are effectively solved.

The invention provides a protection device for a pulsed secondary radar device in a multi-pulse environment, and aims at providing a device which can complete the measurement task and can effectively protect the pulse secondary radar from being damaged in a multi-pulse environment. The invention is realized by the following technical scheme that a pulse secondary radar receiver carries out envelope detection of a received pulse carrier signal through a video detection circuit, performs video amplification and shaping by the video detection circuit, and performs conversion to form a high and low pulse level to an FPGA digital circuit; and in the FPGA digital circuit, the input high and low pulse level is subjected to pulse counting by a pulse counter, and the repetition frequency of the received pulse is calculated, and the pulse counter sends the calculation result to a pulse repetition frequency comparator and a fire and control circuit, comparison with the maximum safety withstand pulse repetition frequency of the pre-set pulse secondary radar in a memory is performed, the pulse repetition frequency comparator sends the comparison result to the fire and control circuit, so as to carry out the sequential control of the pulse secondary radar device.