61results about How to "Reduce explosion accidents" patented technology

The invention discloses a gob-side entry retaining method for an anchor bolt network gangue bag wall body for coal mining without pillars. The gob-side entry retaining method comprises the following steps of: A, crushing solid wastes obtained by separating tunneling gangue and / or coal gangue until the granularity is small than 0.1m and bagging by adopting plastic woven bags to obtain gangue bags; B, conveying the gangue bags obtained in the step A to the position of a working surface, which is used for building an entry, through an underground conveying system and fixing the gangue bags for building a roadside gangue bag wall body to form a gob-side entry; C, arranging the gangue bag wall body into a plurality of steps with different heights; and D, building the gangue bag wall body to the designed position and height and then mounting anchor bolts and paving a metal net, and simultaneously, paving a vertical protection steel belt, carrying out two-way anchoring or single-side pretightening in a large-pallet lane and keeping a gangue bag filling body in the gangue bag wall body in a three-dimensional stress state to achieve the functions of increasing the side pressure of the gangue bag filling body and improving the strength and the rigidity of the filling body.

The invention discloses a fully mechanized mining gob-side entry retaining-based concrete block staggered joint longitudinal stacking wall forming method, which comprises the following steps of: manufacturing concrete building blocks comprising at least two types of building blocks of different weights and sizes; feeding the concrete building blocks to a building entry on a working surface and building a wall main body, wherein the wall main body is formed by longitudinally stacking odd-layer building blocks and even-layer building blocks, paving seams between adjacent odd-layer concrete building blocks and paving seams between even-layer adjacent concrete building blocks are formed in a staggered way, large-weight concrete building blocks are used for building below a position, which is 1.2 meters above the ground, of the wall main body and light-weight building blocks are used for building above the position which is 1.2 meters above the ground; and plugging support bags in which pulverized fuel ash is filled into the space between the wall main body and a top plate. By the method, entry cost after mining can be lowered, and the operation efficiency of a coal pillar-free mining mode is improved.

The invention discloses a helium low-pressure recycling, purification and storage device which comprises a pipeline system, a compression system, a filtration and purification system and a helium storage system, wherein the compression system and the filtration and purification system are communicated with the pipeline system; the helium storage system is arranged at the tail end; the filtration and purification system comprises a coarse helium filter, an oil-water separator, a dryer and a adsorption cylinder; the coarse helium filter is mounted on the air inlet pipe of the compression system; the oil-water separator, the dryer and the adsorption cylinder are respectively mounted on the air outlet pipe of the compression system. The invention further discloses a method for using the helium low-pressure recycling, purification and storage device to recycle, purify and store helium in an aerostatics. The helium low-pressure recycling, purification and storage device adopts a single-stage compression, low-temperature adsorption, and multistage filtering structure, so that the helium recycling and purification rate is high; in addition, the helium low-pressure recycling, purification and storage device has the advantages of simple and compact structure, simpleness and convenience in use, low manufacturing cost, portability and convenience in transportation.

The invention discloses an encapsulating material of a new energy automobile battery. The encapsulating material is prepared from the following components in parts by weight: 100 parts of vinyl-terminated silicone oil, 2 to 6 parts of hydrogen-containing silicone oil, 150 to 300 parts of modified aluminum oxide, 0.05 to 0.15 part of a platinum catalyst, 20 to 50 parts of a halogen-free flame retardant, 2 to 5 parts of white carbon black, 0.5 to 1 part of hexamethyl disilazane, 1 to 5 parts of a peroxide vulcanizing agent and 0.5 to 3 parts of a plasticizer, wherein the peroxide vulcanizing agent is prepared from dibenzoyl peroxide and bis(tert-butyl peroxy isopyl)benzene. The encapsulating material prepared through invention formula disclosed by the invention is nontoxic, has no release ofan irritant gas and is environment-friendly and safe, and not only excellent high / low temperature resistance, excellent weather resistance and excellent electric insulation performance are obtained,but also excellent mechanical performance and excellent heat conduction are obtained; during a working process, an effective protection function on a battery is achieved, heat of the battery can be dissipated in time, high-security protection can be provided for the new energy automobile battery, the safety of the battery is increased, the service life of the battery is increased, and occurrence of the accidents of catching a fire and blasting of the new energy automobile battery can be effectively reduced.

The invention discloses a simple preparation method of 1,1-diamido-2,2-binitroethylene (FOX-7). The preparation method comprises the following steps: continuously adding a mixed acid nitrating agent into a reactor in which 2-methyl-4-6-dyhydroxyl pyridine and an inert solvent are added in advance and continuously stirring at normal temperature till the end of reaction; then continuously adding water into the reaction system to realize hydrolysis; and recycling the solvent and byproducts, carrying out solid-liquid separation, washing and drying to obtain a solid product of 1,1-diamido-2,2-binitroethylene. The preparation method has the advantages that the reaction efficiency is improved remarkably; the operation is simplified; since the nitrating agent is added into the reactant continuously and the inert solvent is also added to the reactant, heat released during reaction can be dissipated uniformly in time, potential safety hazards caused by local heating can be avoided, requirement for reaction temperature control is reduced, the possibility of occurrence of side reactions can be lowered and the essential safety of the preparation method is improved further.

The invention discloses a conductive anti-falling filtering bag which comprises a bag body, wherein the bag body adopts a three-layer complex filtering material structure and comprises a dust meeting layer, a base cloth layer and a bottom layer in sequence from outside to inside, wherein the dust meeting layer and the bottom layer are of meshed structures formed by irregularly winding one or multiple fibers of polyester fibers, acrylic fibers, polyimide fibers, polyphenylene sulfide fibers and polytetrafluoroethylene fibers; the base cloth layer is of a warp-weft intercrossed meshed structure; the filtering bag further comprises a metal conductive sheet; a vertical seam overlapping edge is arranged on the side surface of the bag body; the metal conductive sheet is vertically arranged at the seam overlapping edge of the bag body and is fixedly seamed together with the bag body through a PTFE (polytetrafluoroethylene) seam line; a thin copper wire connected to a bag cage is arranged on the top of the metal conductive sheet. The invention also discloses a preparation method for the filtering bag. The conductive anti-falling filtering bag has the advantages of high overall intensity, long service life and high conductivity and has static electricity prevention performance; the preparation method for the filtering bag is simple; the raw materials are readily available; the preparation cost is low; the preparation method is suitable for large-range popularization and application.

The invention discloses an anti-static mixer for ethanol gasoline, which comprises a mixed cabin and a static relaxation cabin. The mixed cabin further comprises a component oil inlet flange, a denatured fuel ethanol inlet flange and a denatured fuel ethanol ejection hole. The static relaxation cabin further comprises an ethanol gasoline outlet flange. The component oil inlet flange is a port between the anti-static mixer for the ethanol gasoline and the component oil, and the component oil enters the mixer through the port during mixing. The denatured fuel ethanol inlet flange is a port between the anti-static mixer for the ethanol gasoline and the denatured fuel ethanol. The anti-static mixer for the ethanol gasoline combines the mixing of the component oil and the denatured fuel ethanol and the relaxation of electrostatic charges, has simple and practical design, and fully discharges the electrostatic charges produced by mixing during mixing the component oil and the denatured fuel ethanol so as to achieve the aim of reducing combustion and explosion accidents during loading the ethanol gasoline.

The invention provides a safety process capable of reducing hot disintegrating explosion of steel slag. The process comprises a first step of controlling main chemical components of liquid steel slag as follows by mass: 30-55% of CaO, 9-22% of SiO2, 0.5-5% of Al2O3, 14-26% of TFe, 6-14% of MgO, 0.6-2% of MnO and 0.4-0.81 of P2O5; a second step of loading 202-315 kg of coke powder in an empty slag tank in advance, wherein the particle size of the coke powder is smaller than 1mm, and the carbon content of the coke powder is 75%; a third step of slowly adding the liquid steel slag of the first step into the empty slag tank, wherein the temperature of the liquid steel slag is 1,580 + / -20 DEG C, an adding amount is 9-14 tons and the liquid steel slag is completely added in 15 min; and a fourth step of excavating iron-containing materials solidified at the bottom of the slag tank by an excavator when the reaction is finished, wherein the residual steel slag is subjected to hot disintegration treatment according a normal hot disintegration slag process, so that the explosion caused by CO is reduced.

The invention discloses an aluminum bar deep well fusion casting production line system with a safety monitoring function. The system comprises a smelting furnace, a launder and a deep well casting machine, liquid level sensors are arranged at the position of an aluminum outlet of the smelting furnace, the connector position of the aluminum outlet and the launder and the connector position of thelaunder and a die disc, an automatic mechanical locking device is arranged on the aluminum outlet and is used for automatically blocking or opening the aluminum outlet at the different casting stages,a first overflow opening is formed in the connector position of the aluminum outlet and the launder, and communicates with at least one emergency liquid storage pool, a molten aluminum emptying valveis mounted, a dual-filter system and an emergency cutoff valve are arranged on the launder, a water inlet temperature sensor, a water inlet pressure sensor, a water inlet flow sensor and a water returning temperature sensor are arranged between the deep well casting machine and the cooling water system, a monitoring platform is further included, the smelting furnace, the launder and the deep wellcasting machine are interlocked, automatic safe flow control and failure warning can be achieved, the whole process of casting can be intelligently monitored, and safety is high.

The embodiment of the invention discloses a blasting operation supervising method and system and a storage medium. The method comprises the steps of acquiring an operation request; giving a detectioninstruction to a first operator according to the operation request; receiving the detection result fed back by the first operator; identifying image information of the first operator carrying out detection operation from image information of the to-be-blasted area preset range; and giving a first notification message of stopping operation to a second operator carrying out blasting operation when determining that the image information does not meet blasting operation conditions according to the detection result or the image information of the first operator carrying out detection operation. Through the blasting operation supervising method, the conditions in a to-be-blasted area are comprehensively, autonomously and effectively detected in real time, and the detection contents include the blasting environment, operation standards of the operators and the like. Accordingly, occurrence of major blasting accidents is reduced, personnel casualties and property loss are reduced, and the safety production and management level of a coal mine is improved.

The invention discloses a dust removing device. The dust removing device comprises a shell and a waste gas inlet and is characterized in that a control panel is connected to the right end of the shell, a hollow column is connected to the upper end of a transverse rod, a spring is arranged inside the hollow column, the upper end and the lower end of the spring are connected with a pressing rod andthe transverse rod, the upper end of the shell is provided with an air outlet, an alarm is arranged on the left end of the air outlet, antistatic electric filter bags are connected to the lower end ofthe transverse rod, a spark capture device is arranged at the right end of a waste gas inlet, a settling chamber is arranged at the lower end of a stainless steel ring, a hot air inlet pipe is arranged at the left end of the shell, an upper pipeline and a lower pipeline are connected to the right end of the hot air inlet pipe, a valve is mounted on each of the upper pipeline and the lower pipeline, a conveyor is connected to the lower end of the settling chamber, and a temperature sensor is mounted on the inner wall of the shell. The dust removing device can shake the multiple antistatic filter bags on the transverse rod to remove dust in one step and can increased dust removing efficiency.

The invention provides a waste gas adsorption treatment device comprising a first adsorption box, a second adsorption box, a communication pipe for communicating the first adsorption box and the second adsorption box, a first-level flame retardant adsorber and a second-level flame retardant adsorber; the second adsorption box is stacked on the first adsorption box; the first adsorption box comprises a first ventilation opening and a first desorption port which are formed in the side wall; the second adsorption box comprises a second ventilation opening and a second desorption port which are formed in the side wall; the first-level flame retardant adsorber is arranged in the first adsorption box; the second-level flame retardant adsorber is arranged in the second adsorption box; the first ventilation opening, the first-level flame retardant adsorber, the communication pipe, the second-level flame retardant adsorber and the second ventilation opening successively communicate to form a ventilation duct. The invention also provides a treatment method based on the waste gas adsorption treatment device. Compared with the related technology, the waste gas adsorption treatment device saves space and can reduce harm of explosion accidents.

The invention relates to a drying device for gunpowder. The drying device comprises a drying cylinder, a screening device, an exhaust device, a front supporting assembly, a rear supporting assembly, two guide rails and an electric control box. The drying cylinder comprises an outer cylinder body, an inner cylinder body, a spiral heating pipe, a front cover plate, a rear cover plate and a rotating valve. The spiral heating pipe is located between the inner cylinder body and the outer cylinder body. The front cover plate and the rear cover plate are used for sealing the front end and the tail end of the drying cylinder respectively. The rotating valve is communicated with the spiral heating pipe through fluid. The screening device is located at the tail end of the drying cylinder and is connected with the inner cylinder body. The exhaust device comprises an exhaust pipe. One end of the exhaust pipe stretches in the inner cylinder body. The two guide rails are arranged on the periphery of the outer cylinder body in a sleeving manner and are fixed to the front supporting assembly and the rear supporting assembly respectively. The drying cylinder rotates under the guidance of the two guide rails. The electric control box is electrically connected with the drying cylinder, the screening device, the exhaust device and the rear supporting assembly. According to the drying device for gunpowder, the drying problem of tablets prepared through wet granulation can be effectively solved, and the drying device for gunpowder has the beneficial effects of being efficient, environmentally friendly, safe, capable of saving labor, extensive in use and the like.

The invention discloses fireproof and flame retardant aramid fiber filter material base cloth. The fireproof and flame retardant aramid fiber filter material base cloth comprises a base cloth body; aplurality of uniformly distributed transverse wefts are sewed in the base cloth body; a plurality of uniformly distributed vertical warps are sewed in the base cloth body; the connecting parts of theplurality of wefts and the plurality of warps are connected with each other through connecting pieces; primary tensile fiber filaments and secondary tensile fiber filaments are sewed between the adjacent connecting pieces through a needle and a thread; the primary tensile fiber filaments and the secondary tensile fiber filaments are arranged in a crossed manner; a aramid fiber mesh layer is bondedon the upper surface of the base cloth body through a bonding agent. As stainless steel fiber conductive yarns are additionally arranged, a transferring passage is available for static electricity torealize an anti-static effect; in addition, anaphylaxis of a user, which is caused because a fabric is uneasy to adsorb dust or pollen due to frictional electrification, is avoided; in addition, an anti-static fiber possesses excellent washing fastness, bending resistance and wear resistance; therefore, the anti-static fabric is easy to take care and is durable.

The invention discloses an antistatic polytetrafluoroethylene filter bag. The filter bag comprises a bag head, a bag body and a bag bottom, wherein the bag head, the bag body and the bag bottom are made from a polytetrafluoroethylene filter material; the polytetrafluoroethylene filter material comprises basic cloth; the basic cloth is made from a polytetrafluoroethylene filament fiber and a stainless steel fiber by twisting and strand merging and through weaving warps with wefts; nonwoven layers symmetrically cover the upper surface and the lower surface of the basic cloth; the nonwoven layers are made from a polytetrafluoroethylene fiber or the polytetrafluoroethylene fiber and one or more of high-performance fibers of a polyphenylene sulfide fiber, a polyamide fiber, a polyamideimide fiber and the like by blending; a stainless steel metal net layer is sewed at a landing edge of the bag body. The filter bag prepared by the invention is resistant to a high temperature and corrosion, is excellent in electrical conductivity, further has the functions of enduringly removing static electricity and reducing fire hazards or explosions generated due to electrostatic sparks, and can be widely applied to high-temperature fire protection, explosion protection and dust removal in the fields of steel and iron smelting, refuse incineration, coal-fired power plants, cement, chemical engineering and the like.

A microcomputer arc-extinguishing, harmonic-eliminating and overvoltage-protecting device relates to the technical field of arc extinguishing and harmonic eliminating of an electric power system. The microcomputer arc-extinguishing, harmonic-eliminating and overvoltage-protecting device comprises a high-voltage current-limiting fuse, a voltage transformer, a three-phase combined type overvoltage protector, a vacuum contactor, a microcomputer arc-extinguishing controller, a high-voltage fuse and a zero-sequence current transformer, wherein three-phase ports of the three-phase combined type overvoltage protector are connected with a three-phase high-voltage isolation switch; a grounding terminal of the three-phase combined type overvoltage protector is connected with the voltage transformer and then grounded; the high-voltage fuse is connected in series between three-phase ports of the voltage transformer and the three-phase high-voltage isolation switch; a voltage transformer control terminal of the microcomputer arc-extinguishing controller is connected with the voltage transformer; a vacuum contactor control terminal of the microcomputer arc-extinguishing controller is connected with the vacuum contactor; three-phase ports of the high-voltage current-limiting fuse are respectively connected with the three-phase high-voltage isolation switch, while the other ends of the high-voltage current-limiting fuse are connected with the vacuum contactor; a grounding terminal of the vacuum contactor is grounded; and the zero-sequence current transformer is arranged between the grounding terminal of the vacuum contactor and a grounding point. The overvoltage-protecting device is high in action speed and capable of arc-extinguishing and harmonic-eliminating.

The invention provides an oxygen cylinder fixing device for medical nursing. The oxygen cylinder fixing device comprises an oxygen cylinder base on which a vertical baffle plate is fixed. The verticalbaffle plate is provided with a cylinder body clamping device which can clamp the cylinder body of the oxygen cylinder, and a bottleneck clamping device which can clamp and fixes the bottleneck of the oxygen cylinder. The cylinder body clamping device and the bottleneck clamping device are mounted on the vertical baffle plate, or the bottle body clamping device and the bottleneck clamping deviceare fixedly mounted on different fixing modules. According to the oxygen cylinder fixing device, the oxygen cylinder is fixed through a spring sleeve half ring, a bottle clamp and an oxygen cylinder sink tank, thereby effectively preventing overturning or collision of the oxygen cylinder in a storage or use process, improving safety and reducing explosion accidents.

The invention provides an electric vehicle fire extinguishing device which comprises a sealing cover covering an electric vehicle. A temperature sensing probe, a smoke sensing probe and a carbon dioxide gas inlet are arranged in the sealing cover; a main control box and a carbon dioxide gas cylinder as well as a 220V power source, a smoke alarm, a temperature alarm and a charging control cabinet which are electrically connected with the main control box are arranged outside the sealing cover; two gas paths are connected between the carbon dioxide gas cylinder and the sealing cover; one gas path is provided with a temperature control electromagnetic release valve, and the other gas path is provided with a smoke control electromagnetic release valve; and the temperature control electromagnetic release valve, the smoke control electromagnetic release valve, the temperature sensing probe and the smoke sensing probe are all electrically connected with the main control box. According to the electric vehicle fire extinguishing device, fire can be automatically detected when the electric vehicle is charged or parked, and fire extinguishing is automatically performed.

The invention discloses an anti-static mixer for ethanol gasoline, which comprises a mixed cabin and a static relaxation cabin. The mixed cabin further comprises a component oil inlet flange, a denatured fuel ethanol inlet flange and a denatured fuel ethanol ejection hole. The static relaxation cabin further comprises an ethanol gasoline outlet flange. The component oil inlet flange is a port between the anti-static mixer for the ethanol gasoline and the component oil, and the component oil enters the mixer through the port during mixing. The denatured fuel ethanol inlet flange is a port between the anti-static mixer for the ethanol gasoline and the denatured fuel ethanol. The anti-static mixer for the ethanol gasoline combines the mixing of the component oil and the denatured fuel ethanol and the relaxation of electrostatic charges, has simple and practical design, and fully discharges the electrostatic charges produced by mixing during mixing the component oil and the denatured fuelethanol so as to achieve the aim of reducing combustion and explosion accidents during loading the ethanol gasoline.

A microcomputer arc-extinguishing, harmonic-eliminating and overvoltage-protecting device relates to the technical field of arc extinguishing and harmonic eliminating of an electric power system. The microcomputer arc-extinguishing, harmonic-eliminating and overvoltage-protecting device comprises a high-voltage current-limiting fuse, a voltage transformer, a three-phase combined type overvoltage protector, a vacuum contactor, a microcomputer arc-extinguishing controller, a high-voltage fuse, and a zero-sequence current transformer, wherein three-phase ports of the three-phase combined type overvoltage protector are respectively connected with a three-phase high-voltage isolation switch; a grounding terminal of the three-phase combined type overvoltage protector is connected with the voltage transformer and then grounded; the high-voltage fuse is connected in series between three-phase ports of the voltage transformer and the three-phase high-voltage isolation switch; a voltage transformer control terminal of the microcomputer arc-extinguishing controller is connected with the voltage transformer; a vacuum contactor control terminal of the microcomputer arc-extinguishing controller is connected with the vacuum contactor; three-phase ports of the high-voltage current-limiting fuse are respectively connected with the three-phase high-voltage isolation switch, while the other ends of the high-voltage current-limiting fuse are connected with the vacuum contactor; a grounding terminal of the vacuum contactor is grounded; and the zero-sequence current transformer is arranged between the grounding terminal of the vacuum contactor and a grounding point. The overvoltage-protecting device is high in action speed and capable of arc-extinguishing and harmonic-eliminating.

The invention discloses a gas extraction negative-pressure pipeline leakage detecting device and method. The pipeline leakage detecting device comprises a distributed optical fiber sensor, a first-endcoupler, a Faraday rotation mirror, a photoelectric signal detection system and a computer signal processing system. The distributed optical fiber sensor is arranged in a gas extraction negative-pressure pipeline. The Faraday rotation mirror is arranged at the tail end of the distributed optical fiber sensor. The first-end coupler is arranged at the front end of the distributed optical fiber sensor and connected with the photoelectric signal detection system, and the photoelectric signal detection system is connected with the computer signal processing system. According to the pipeline leakage detecting device, through photoelectric signal conversion and signal optimization treatment, whether leakage happens in the gas extraction negative-pressure pipeline or not can be detected in time,the leakage point can be accurately positioned, a leakage detection system is high in safety index and good in stability performance, and the detection efficiency and the positioning precision are greatly improved.

The invention belongs to the technical field of office chairs, and in particular relates to an office chair realizing safe rise and fall. The office chair comprises a chair base, a lifting rod, a triggering mechanism and a base. For the office chair, limiting clamping plates, a gear, a triggering block and a threaded sleeve are designed at the inner side of the lifting rod, due to the match amongthe limiting clamping plates, the gear, the triggering block and the threaded sleeve, the rise and fall of the lifting rod realize the mechanical transmission, and when the triggering block is triggered by the triggering mechanism to move downwards, the trigging block squeezes the limiting clamping plates so that the limiting clamping plates lose the limitation for the gear and the threaded sleeve; and after the chair base bears the weight, the chair base transmits the weight-bearing pressure to the threaded sleeve through a lifting inner rod, through the threaded match between the threaded sleeve and internal threads on a lifting outer sleeve, the lifting inner rod can slide downwards relative to the lifting outer sleeve, the lifting function is realized, and through the mechanical realization of the lifting function of the lifting chair, the accident of air cylinder explosion caused by using the air-pressure type lifting chair is reduced.

The invention relates to the technical field of hazardous waste treatment, and particularly relates to a hazardous waste incineration online management system. The hazardous waste incineration onlinemanagement system comprises a server, wherein the server comprises an inventory management module, a compatibility management module, a production information monitoring module and a comprehensive safety management module; the inventory management module is used for counting inventory information of hazardous waste; the compatibility management module is used for acquiring compatibility information of the hazardous waste and monitoring and managing parameter information about the hazardous waste in the compatibility information in real time; the production information monitoring module is usedfor dynamically monitoring index data of an incinerator when the hazardous waste is put into the incinerator for incineration; and the comprehensive safety management module is used for sending out warning information in time when key parameter information or key index data of the inventory management module, the compatibility management module and the production information monitoring module isfound through monitoring. The hazardous waste incineration online management system can perform safety monitoring and management of the whole process in the incineration process of solid hazardous waste, and reduces occurrence of safety accidents such as explosion.

The invention belongs to the technical field of fire safety of oil storage tanks, and particularly relates to an inflatable oil-gas-free sealing structure of an external floating roof oil tank. According to the technical scheme, the inflatable oil-gas-free sealing structure of the external floating roof oil tank comprises an annular primary sealing structure and an annular secondary sealing structure which are connected to a floating disc, and the primary sealing structure and the secondary sealing structure are located between a tank wall and the floating disc; the secondary sealing structure is connected with an inflatable capsule, an embedded connecting nut is fixed in the inflatable capsule, the secondary sealing structure comprises a rain baffle, one end of the rain baffle is connected to the floating disc, and the embedded connecting nut is connected with the rain baffle through an inflatable capsule fixing piece. One end of the inflatable capsule fixing piece is connected with the embedded connecting nut, and the other end of the inflatable capsule fixing piece penetrates through hole sites of the rain baffle, a supporting limiting plate and an oil separation film and is fixed to the rain baffle, so that reliable connection is guaranteed. The invention provides the inflatable oil-gas-free sealing structure of the external floating roof oil tank.

The invention provides a microcomputer arc-extinguishing resonance-elimination overvoltage protection device and relates to the technical field of electric power system arc-extinguishing and resonance-elimination. The microcomputer arc-extinguishing resonance-elimination overvoltage protection device comprises a high-voltage current limiting fuse, a voltage transformer, a three-phase combined overvoltage protector, a vacuum contactor, a microcomputer arc-extinguishing controller, a high-voltage fuse and a zero-sequence current transformer. Three phase ports of the three-phase combined overvoltage protector are respectively connected with a three-phase high-voltage isolation switch. A grounded end is connected with the voltage transformer and then is grounded. The high-voltage fuse is serially connected between three phase ports of the voltage transformer and the three-phase high-voltage isolation switch. A voltage transformer control end of the microcomputer arc-extinguishing controller is connected with the voltage transformer, and a vacuum contactor control end is connected with the vacuum contactor. Three phase ports of the high-voltage current limiting fuse are respectively connected with the three-phase high-voltage isolation switch, and the other end of the high-voltage current limiting fuse is connected with the vacuum contactor. A grounded end of the vacuum contactor is grounded, and a zero-sequence current transformer is arranged between the grounded end and a grounding point. The overvoltage protection device provided by the invention is high is action speed and is capable of realizing arc-extinguishing and resonance-elimination.

The invention provides a control device and a control method for a plasma generator and a plasma generator, and belongs to the field of plasma. The control device comprises a detection unit used for detecting the concentration of combustible gas in the surrounding environment of the plasma generator, the concentration of combustible gas in a gas inlet pipeline and the concentration of combustiblegas in the plasma generator; and a processing unit, which is used for controlling the gas that can reduce the concentration of combustible gas to enter the plasma generator through a blowing pipelineso as to reduce the concentration of the combustible gas that enters the plasma generator, when the concentration of the combustible gas in the environment surrounding the plasma generator is in a safety threshold range and one of the concentration of the combustible gas in the plasma generator and the concentration of the combustible gas in the gas inlet pipeline exceeds the safety threshold range. Through the technical scheme, the plasma generator can be applied to occasions with high safety requirements, large waste gas concentration fluctuation, easy formation of a burning and explosion environment and the like.

The invention discloses an airtight mechanism for protecting a bearing chamber. The airtight mechanism comprises the bearing chamber (1) and is characterized in that a gas inlet (2) is formed in a shell of the bearing chamber (1); the gas inlet (2) is connected with a minitype gas feeding pump (4) through a gas inlet pipe (3); gas generated by a gas generator (5) inputs trace gas into the bearing chamber (1) through the minitype gas feeding pump (4) so as to protect the bearing chamber (1). According to the invention, trace gas is inputted to the bearing chamber so as to protect the bearing chamber, so that the running of the bearing chamber is stable and the cost is low; the probability of blast accident of the bearing chamber is reduced; the structure is simple; the current equipment is conveniently modified, so that the airtight mechanism is fit for popularization and application.

The invention discloses equipment for drying pyrotechnic composition. The equipment is characterized by comprising a drying module (1), a screening module (2), an air suction module (3), a front support and speed-regulation module (4), a rear support module (5) and an electric cabinet (6). Steam or hot water enters a heating pipe of the drying module to heat the inside of the drying module; after entering the drying module from a rear end inlet of the drying module, the pyrotechnic composition moves towards the front end gradually under the action of rotation at a horizontal inclination angle, and when the pyrotechnic composition passes through the screening module at the front end, grains are separated from composition in the rolling process. The screening module is in serial connection with the front end of the drying module. An air suction pipe of the air suction module is fixed in the center of the drying module to suck away hot air and dust which are generated in the drying module and collect the hot air and the dust through a water washing system, and the safety is guaranteed. The front and rear support modules support the drying module, power is provided by a speed-regulation motor of the front support module, and the drying module is driven by a guide wheel to rotate. The equipment solves the problem of drying of grains in a wet granulation method for the pyrotechnic composition. The equipment has the characteristics of safety, environment friendliness and high efficiency.