184 results about "Gas explosion" patented technology

The invention provides a blast suppression method and system for an underground cavity of a pumped storage power station. The method comprises the following steps: configuring and deploying a multispectral gas sensor array; carrying out gas explosion limit calculation and risk assessment; calculating the risk level of explosion by using the prediction model; performing graded explosion suppression operation by using a graded explosion suppression execution module; combustible gas is guided to enter an inerting area by utilizing a space flow guide optimization module; and the ignition source blocking module is used for cooperative control to block an ignition source. The technical problems of low mixed gas explosion risk prediction and monitoring precision, low explosion suppression efficiency, slow response speed and relatively high operation and maintenance cost are solved.

The invention discloses a building structure explosion multistage early warning and damage assessment integrated analysis method, which relates to the field of building structure safety, and comprises a BIM-FEM model conversion module, an FEM explosion response and damage assessment module, an Internet of Things gas sensor acquisition module, an early warning analysis and grading early warning module and a data storage module. And an efficient automatic model conversion interface between the BIM and the FEM is developed. The interface realizes bidirectional data conversion between the BIM model and the finite element analysis model; a gas explosion load is applied to finite element analysis software, dynamic response and damage of each component under the gas explosion load are studied through numerical simulation, and anti-explosion damage evaluation attributes of each component are formed. The problem of low modeling efficiency of a complex structure in finite element analysis software is effectively solved, and automatic data extraction, model mapping and result write-back between the BIM model and the FEM model are realized.

The invention discloses a simulation device and method for simulating goaf coal spontaneous combustion induced gas explosion, and belongs to the technical field of goaf gas explosion simulation. The simulation device comprises an explosion cavity body, a region control system, an explosion simulation system, an environment simulation system, a monitoring system and an intelligent control system; the area control system is used for dividing the space in the explosion cavity to form an explosion area and a non-explosion area at different positions; one end of the explosion simulation system is connected to an explosion area in the explosion cavity through the bottom of the explosion cavity; the environment simulation system is used for injecting gas needed by detonation of the explosion simulation system into the explosion area and injecting gas used for simulating the internal environment of the goaf into the non-explosion area. The monitoring system is used for measuring a gas explosion process in an explosion area and data change conditions of temperature, gas concentration and pressure characteristics of a coal face; according to the invention, the influence of gas explosion at different positions of the goaf in the explosion cavity on the coal face can be simulated.

The invention relates to a coal face gas concentration dynamic distribution model determination method, and belongs to the technical field of coal mine safety monitoring. The technical problems that traditional single-point static monitoring cannot reflect working face gas dynamic distribution and prediction precision is low are solved. According to the technical scheme, the method comprises the steps of deploying air inlet corner, working face middle and air return corner sensor networks to collect data in real time; a gas distribution function model y = ae (1-x) is built, a is the return air corner concentration value, and b is the dynamic attenuation coefficient; fitting measured data through a least square method to solve parameters; and setting an update period t to dynamically correct the model. The technical effects are that working face gas concentration full-space dynamic mapping is realized, ventilation condition changes are responded in real time, disaster early warning capability is improved in combination with a visual interface, gas explosion risk is obviously reduced, and safe production of a coal mine is guaranteed.

The invention relates to the technical field of underground hydraulic fracturing, and discloses a directional hydraulic fracturing device for underground hydraulic fracturing equipment, which comprises a fracturing pipe body, and the outer edge of the fracturing pipe body is fixedly sleeved with an exhaust funnel. Gas is extruded by fracturing fluid and supplies gas to the interior of a notch through a filter screen and an electromagnetic valve gas inlet pipe, propelling blades are pushed to rotate, nozzles are driven to conduct position adjustment, an angle sensor is used for assisting in detection that the nozzles at the needed angle are in butt joint with the electromagnetic valve liquid inlet pipe, and an electric telescopic rod is used for driving a friction clamping plate to clamp and limit the propelling blades. Gas enters the main clamping cylinder through the electromagnetic valve main clamping pipe, the auxiliary drum membrane deforms to further clamp and seal the self-adaptive plugging device, and the electromagnetic valve main clamping pipe is closed, so that the angle of the nozzle is convenient to adjust, and meanwhile, the sealing stability of the self-adaptive plugging device is further improved; auxiliary gas is exhausted from the electromagnetic valve main exhaust pipe and the center of the fracturing pipe body, and gas explosion caused by extrusion of gas in the device is avoided.

The invention belongs to the technical field of residual coal re-mining, and particularly relates to a gas and fire treatment method in the tunneling process of a lower-layer residual coal re-mining roadway, which comprises the following steps of: injecting gel foam into an upper-layer mining stopping line and an upper-layer open-off cut for leaking stoppage and cooling; advanced extraction is conducted on gas accumulated in a gas guide fissure zone of an overlying coal rock stratum of the upper-layer old goaf, meanwhile, carbon dioxide is injected into an air inlet and return roadway area of the upper-layer old goaf through a carbon dioxide injection drill hole in the ground, gas is displaced, and negative pressure air leakage of the upper-layer old goaf is prevented; and judging whether the residual coal in the upper-layer old goaf is spontaneously combusted or not, if the residual coal in the upper-layer old goaf is spontaneously combusted, increasing the carbon dioxide injection amount and the diffusion area, and performing advanced detection on the cavity in the process of tunneling the lower-layer roadway. According to the method, the risk probability of gas overrun, coal spontaneous combustion or gas explosion in the tunneling process of the lower-layer residual coal re-mining roadway is reduced.

This invention relates to the field of research on the operational characteristics of overpressure relief devices, and particularly to an experimental device for measuring the operational characteristics of overpressure relief devices under water hammer conditions. The device includes: a high-pressure air compressor, a frame, a piston accumulator, a quick-opening device, a high-pressure test assembly, and a high-frequency dynamic pressure sensor. This invention enables the measurement of operational characteristics under different pressure rise rate loads caused by water hammer phenomena on a test bench, providing an experimental platform for the research on the operational characteristics of overpressure relief devices under high pressure rise rates. The overall device is simple, quick, and stable. It effectively solves the problem of applying high pressure rise rate loads in current overpressure relief device operational characteristic measurement tests, overcomes the danger of using combustible gas explosions as pressure sources in existing operational characteristic measurement tests, and overcomes the shortcomings of existing test methods, such as long testing times, the need to calculate gas explosion pressure, and the difficulty in accurately controlling the pressure rise rate.

The application discloses a non-powered internal circulation integrated sewage treatment device and a sewage treatment method, and mainly relates to the field of sewage treatment. The device comprises a treatment pool (1), the side of the treatment pool (1) is provided with a water outlet groove (2), and the treatment pool (1) comprises a gas explosion area (3), a flow guide area (4) and a sedimentation area (5); an aerator (8) is arranged at the middle position of the gas explosion area (3), and gas stripping is formed in the gas explosion area (3); a water inlet pipe (9) is arranged at the bottom of the pool, the vertical position of the water inlet pipe (9) is located in the flow guide area (4) below the second partition plate (7), the water inlet pipe (9) horizontally inlets water at multiple points at the bottom of the pool, and the water inlet direction is towards the gas explosion area. The device has the beneficial effects that it is an automatic internal circulation integrated sewage treatment device, the biological denitrification and phosphorus removal function is added while the advantages of the aeration sedimentation tank are retained.

This invention discloses a numerical characterization method for gas explosion damage based on in vivo biological damage correction, belonging to the interdisciplinary field of explosion mechanics and biomedicine. The method first acquires multi-dimensional damage data of organisms in gas explosion experiments, constructs a fluid-structure interaction numerical model of the gas explosion flow field in the tunnel and a biomimetic finite element model of the organism, solves the model using an improved arbitrary Lagrange-Euler algorithm, and extracts dynamic biomechanical response parameters. A quantitative correlation between mechanical response and damage level is established through a multi-objective collaborative correction model and an ordered Probit correction model. After iterative optimization, a high-confidence gas explosion-induced biological damage prediction model is output. This invention forms a complete closed loop of simulation-experiment-correction, which can accurately characterize gas explosion biological damage, providing technical support for research on explosion injury mechanisms, assessment of protective effectiveness, and clinical diagnosis and treatment.

The utility model provides a double-push-rod bidirectional opening high-pressure air cavity device, which relates to the technical field of explosion suppression and comprises an anchor rod, a left shock wave receiving plate, a left push rod, a left hanging device, a left triggering device, a lower pressure gauge, a high-pressure air cavity and a powder storage bin. By means of the design that the left shock wave receiving plate and the right shock wave receiving plate are located on the left side and the right side of the device respectively, explosion shock waves from different directions can be received in an omnibearing mode, and it is ensured that no matter which direction of explosion occurs in a roadway, shock wave signals can be sensed in time; therefore, the response sensitivity and reliability of the device to explosion are improved, and explosion suppression failure caused by a receiving blind area is effectively avoided. Meanwhile, the left push rod and the right push rod are connected with the shock wave receiving plate and the trigger device respectively, it is guaranteed that the trigger device can act rapidly and accurately, the flameproof medium can be sprayed out in time, explosion flames are effectively prevented from spreading, and harm caused by gas explosion is reduced to the minimum.

The application discloses a non-explosive seismic source device and a shock method for seismic exploration, relates to the technical fields of seismic exploration and blasting, and comprises a blasting cylinder, a top cover and a pipe plug, the pipe plug is arranged in the blasting cylinder, one end of the blasting cylinder is sealed, the other end is connected with the top cover through threads, and a gas-stopping pad, a sponge column and a gas generator are sequentially arranged in the blasting cylinder. The non-explosive seismic source device and the shock method for seismic exploration have the advantages of simple structure, easy material acquisition, no influence of the use environment, no harmful gas generation, no need of approval procedures, no need of a blasting operation certificate for an operator, easy operation after simple training, good coupling between the device and a stratum, use in complex terrain areas, use in water areas such as lakes and oceans, and high safety and good operability compared with a gas explosion seismic source.

This utility model discloses a safety performance testing chamber for mining electromechanical equipment, including a chamber body, an explosion-proof door, an observation window, a top sealing mechanism, an intermediate sealing partition, a foundation, and pipeline interfaces. The chamber body is a rectangular steel structure, using a composite design of steel plates and grid-shaped reinforcing ribs, and is made of carbon steel and stainless steel composite materials, making it vibration-resistant and explosion-proof. The intermediate sealing partition is removable, dividing the chamber body into two small compartments or forming a complete large chamber, flexibly adapting to the testing of small or large diesel engines. The top sealing mechanism uses a U-shaped groove and a venting membrane seal, allowing for rapid pressure relief in the event of an explosion. The side walls are equipped with a rotating explosion-proof door and a high-temperature tempered glass observation window for easy entry, exit, and observation. The foundation is fixed with anchor bolts, and the interior and exterior of the chamber are coated with antistatic, flame-retardant, and rust-proof paint. This utility model can withstand the impact of a methane-air or methane-hydrogen-air mixture explosion, ensuring safety; it is suitable for verifying the safety performance of diesel engines in underground coal mines, and has the advantages of high efficiency, safety, and economy.

The utility model discloses a semi-explosion type transverse wave source based on high-pressure gas explosion near-field waveform regulation and control, which comprises a cylindrical detonation tube, a gas chamber is arranged in the detonation tube, one side of the gas chamber is an arc-shaped surface, the central axis of the arc-shaped surface is consistent with that of the detonation tube, the other side of the gas chamber is an isolation surface, and the isolation surface is arranged on the detonation tube. A groove consistent with the detonation tube in the extending direction is formed in the side, close to the isolation face, of the tube wall of the detonation tube to form a waveform regulation and control chamber, an annular notch groove is formed in the side, close to the arc-shaped face, of the tube wall of the detonation tube, and sealing heads are arranged at the two ends of the detonation tube. The semi-explosive shear wave source realizes near-field waveform regulation and control on a high-pressure gas detonation pressure field through structural design, performs near-field waveform regulation and control on the pressure field generated by detonation through structural design of the detonation tube, enables the energy proportion of a generated shear wave signal to be amplified, is a brand-new shear wave source generation way, and can be applied to the field of high-pressure gas detonation. The system has the advantages of being strong in transverse wave signal, environmentally friendly, good in economical efficiency, good in field adaptability and the like.

The utility model discloses a dry-type flame arrester for a coal mine gas conveying pipeline, which relates to the technical field of flame arresting of the coal mine gas conveying pipeline and comprises a shell component, a flame arresting part and a fastener. Through the combined design of the fire-retardant sleeve, the stainless steel wire mesh and the corrugated plate type fire-retardant disc, flame propagation can be effectively blocked, and gas explosion accidents are prevented; the flame arrester adopts the design of the shell assembly and the flame arresting part which are in mirror symmetry, is convenient to install and maintain, and ensures the stability of the structure through the connection of a fastener; the flame arrester is suitable for gas conveying pipelines with different pipe diameters, can meet the use requirements under different pressure conditions, and is wide in application range; when the gas passes through the flame arrester at the average flow speed of 15m / s, the pressure drop is less than or equal to 1kPa, so that the gas conveying efficiency is not influenced; in conclusion, the dry type flame arrester provided by the utility model can effectively solve the explosion problem in a coal mine gas conveying pipeline, insulates flame propagation, ensures the production safety of a coal mine, and has a wide application prospect.

The utility model discloses a rocking-turn type steel slag cooling granulator, which relates to the technical field of energy conservation and environmental protection in the ferrous metallurgy industry, and comprises a rocking-turn roller, the rocking-turn roller comprises a steel slag treatment section, the two ends of the steel slag treatment section are fixedly connected with roller supporting sections, the outer side of the steel slag treatment section is provided with a steel slag material port, and the steel slag material port is connected with the roller supporting sections. A plurality of kick-out devices are arranged in the steel slag treatment section, and the outer surface of the roller supporting section is fixedly connected with a roller body supporting ring and a roller body transmission wheel. By the adoption of the structure, water does not need to be pumped in the steel slag treatment process, cooling and granulation of high-temperature molten steel slag are achieved through circulating cooling air and external circulating cooling water, and waste heat resources, absorbed by the cooling air and the cooling water, of the molten steel slag can be recycled through an external waste heat boiler and other processes; the cooling water pipe bundle is arranged externally, so that leakage caused by abrasion of the membrane wall structure roller is avoided, and the problems of gas explosion and the like caused by water jacket blockage of a jacket type roller are avoided.

The invention discloses a goaf residual coal spontaneous combustion and gas symbiosis disaster simulation experiment system and method, and belongs to the field of coal mine residual coal spontaneous combustion and gas symbiosis disaster. According to the invention, evolution laws of mass, temperature, pressure, gas components and content in the spontaneous combustion and gas explosion process of the residual coal are explored. The residual coal combustion chamber in the simulation experiment system provided by the invention can be independently used, and is provided with a plurality of interfaces for being connected with monitoring equipment, so that the residual coal combustion process can be independently researched, and the evolution of residual coal spontaneous combustion and gas symbiosis disasters in a goaf can be comprehensively researched; and a necessary basis is provided for prevention and control of residual coal spontaneous combustion and gas symbiosis disasters in the mine goaf while the experiment cost is reduced.

The invention belongs to the technical field of explosion mechanics and experimental stress analysis, and particularly discloses a high-pressure gas explosion test system in a porous digital caustic experimental system. The system comprises a high-pressure gas explosion generation subsystem, a porous caustic optical measurement subsystem, a data acquisition and processing subsystem and an integrated control and synchronous triggering subsystem. Real-time segmentation and feature extraction are carried out on the image through the FPGA module to compress data, accurate synchronization of time sequences of explosion, illumination and acquisition is ensured through synchronous triggering, and efficient, reliable and automatic observation and analysis of an explosion transient physical field are achieved. The system is not only suitable for standard blast wave research, but also can be flexibly adapted to simulation of a complex turbulent flow field, research of wave system interaction and other frontier scientific problems, and the application boundary and scientific research value of the porous digital caustics technology are expanded.

The utility model discloses a kind of gas combustion type gravel blasting pipes, belong to gravel blasting pipe technical field.It is provided with core combustion chamber in pipe body, oxygen storehouse is fixedly arranged in core combustion chamber, oxygen hole is opened in the side of oxygen storehouse center, oxygen sealing strip that oxygen hole is sealed is arranged on oxygen hole, the top of pipe body is fixedly connected with expansion cap, the inside of expansion cap is hollow and is formed into gas storage warehouse, electric detonator is installed in the inside of expansion cap, the bottom of electric detonator extends into core combustion chamber.The utility model, when expansion cap is blocked to gravel lead hole, make gas explosion tube more stable and be fixed in lead hole, after pipe body detonation, the energy generated will be blown from lead hole, effectively reduce energy from lead hole leakage, gravel effect is better, and adopt hydrogen and oxygen as combustible gas, clean energy, more environmentally friendly and safe, after ignition, it can be detonated, detonation efficiency is high, meet engineering immediacy demand.

This invention provides a gas explosion-resistant building structure, comprising: a building foundation; a building side facade, fixed to the building foundation and enclosing the building's interior area; wherein the building side facade is composed of multiple alternating reinforced steel columns and multiple building wall panels, each wall panel comprising: two corrugated steel plates, and a reinforcing layer and an explosion-proof layer stacked between the two corrugated steel plates; and a building roof slab, made of two corrugated steel plates and an explosion-proof layer disposed between the two corrugated steel plates, the building roof slab being fixed to the building side facade. This gas explosion-resistant building structure and its construction method, through the reinforced steel columns and building wall panels fixed to the building foundation, and the building roof slab located at the top of the building side facade formed by the reinforced steel columns and building wall panels, improves the structural strength and overturning resistance of the gas explosion-resistant building structure, solving the problems of low structural strength, easy overturning, and weak explosion resistance in existing technologies.

The utility model discloses a sediment stirring machine and relates to the technical field of engineering machinery. The device comprises a support and an upper opening stirring box at the top of the support, an air explosion pipe with an air outlet hole is longitudinally arranged in the box and connected with an air pump, a chain transmission mechanism with a baffle is arranged at the top of the box, and a double-rotating-shaft tool bit assembly and a mud driving plate are arranged on the lower portion of a transverse rod movably installed on a chain. Bubble flow is generated through a gas explosion pipe to prevent sediment deposition, a motor drives a chain to drive a cross rod to reciprocate, the rotary tool bit achieves all-directional stirring cutting, and stirring dead angles are eliminated in cooperation with a mud driving plate. A chute I controlled by a pneumatic gate is arranged on the right side of the stirring box, is connected with a rotary filter cage in the sludge storage box for impurity separation, and is matched with a cleaning brush self-cleaning and water pump drainage system. The equipment integrates the functions of gas explosion disturbance, mechanical cutting and scraping and sweeping, adopts the automatic control box to coordinate the operation of each unit, effectively solves the problem of sediment hardening, and remarkably improves the stirring uniformity and the treatment efficiency.

This invention discloses a self-mixing gas explosion limit testing device, belonging to the technical field of gas explosion limit testing devices. The self-mixing gas explosion limit testing device includes a base, a mounting frame mounted on the base, an explosion chamber mounted on the mounting frame, an exhaust component mounted on the explosion chamber, an igniter mounted on the explosion chamber, an inlet component and a stirring component inside the explosion chamber, and an exhaust component below the base. The exhaust component includes a transmission component and an energy storage component. Simultaneously with the input of gas, the stirring component mixes the gas, improving mixing uniformity and speed. This stirring method achieves rapid gas homogenization without compromising sealing, improving mixing effect while preventing gas leakage and ensuring testing effectiveness. By combining the exhaust component and the energy storage component, the high-pressure gas generated during the explosion test is utilized to clean the explosion chamber, further improving testing effectiveness and resource utilization.

The utility model relates to the technical field of agricultural machinery, and provides a gas explosion fertilizer applicator. Comprising a lifting device, a gas explosion device, a fertilizer discharging device and a current sensor, the lifting device is connected with the gas explosion device; a lifting driving motor assembly for driving the gas explosion device to lift is arranged in the lifting device; a gas explosion generator is arranged in the gas explosion device, an exhaust port of the gas explosion generator is connected with a first end of a tee joint, a second end of the tee joint is connected with a fertilizer adding hopper, and a third end of the tee joint is rotationally connected with a fertilizing pipe; and a rotary driving motor assembly for driving the fertilization pipe to rotate is arranged in the gas explosion device. The device has the beneficial effects that the current sensor is adopted to collect the working current of the lifting driving motor assembly and the rotating driving motor assembly, the working current can represent the shearing strength of soil, data reference is provided for gas explosion pressure parameters, and the fertilization working quality is improved.

The application provides a gas conveying pipeline fine water mist explosion-proof device, which comprises a long pipe, a plurality of atomizing nozzles, a communicating cavity arranged in the long pipe, a water pipe communicated with one end of the communicating cavity, and a drainage cleaning mechanism arranged on the arc surface of the long pipe. The drainage cleaning mechanism comprises a leakage hole, a cylinder and a fan blade assembly. The leakage hole is arranged on the arc surface of the long pipe, the cylinder is inserted into the leakage hole, and the fan blade assembly is arranged in the cylinder. The arc surface of the long pipe is provided with a square hole. The gas in the pipeline is sprayed by the atomizing nozzles, so that the concentration of the gas is reduced, and the gas explosion is prevented to a certain extent. The water in the pipeline is discharged through the cylinder and the leakage hole, so that the rusting of the pipeline caused by excessive water in the pipeline is avoided.

The invention relates to the technical field of mine safety monitoring and disaster prevention and control, and provides a mine thermodynamic disaster detection and prevention integrated intelligent cooperative emergency method and system aiming at the problems of detection and prevention separation, response lag and model staticization in the prior art. Establishing a disaster identification model by using a machine learning algorithm to realize dynamic identification and risk grading of coal spontaneous combustion and gas explosion; a cooperative emergency instruction is automatically generated according to the risk level, and an underground prevention and control device is linked based on the cooperative emergency instruction to perform operations such as gas extraction, ventilation adjustment and spray cooling, so that synchronous response of early warning and prevention and control is realized; the system has a self-learning optimization capability, and continuously corrects a model and a strategy through backtracking analysis. According to the invention, accurate early warning, quick response and dynamic optimization of disaster prevention and control are realized, and the intelligent level and intrinsic safety capability of mine safety management are remarkably improved.

The invention relates to the technical field of tungsten carbide powder production, in particular to a ton barrel connection table and method, the ton barrel connection table comprises a base, a bearing frame, a material receiving pipe and a control system, the base is provided with a weighing mechanism, and the bearing frame is installed on the base and provided with a vibration mechanism; the material receiving pipe is elastically installed on the bearing frame and connected with a discharging opening of the ton barrel and the feeding pipe. A gas explosion device, a cover replacing device and a ton barrel locking mechanism can be additionally arranged, and all the components are electrically connected with the control system. The ton barrel connection method comprises the steps of parameter setting, ton barrel butt joint valve opening, weighing vibration triggering and empty weighing valve closing barrel changing, and full-process automation of ton barrel fixing, discharging, residue cleaning and cover changing is achieved. Intelligent linkage of weighing and discharging is achieved, material loss is reduced, the residue cleaning efficiency and the equipment universality are improved, the device is matched with an AGV and an upper-layer production system, and the continuous operation requirement of an intelligent tungsten carbide powder production line is met.

The invention relates to an application of a purple-leaf plum leaf extract in inhibiting hydrogen production of active metal dust when encountering water, and belongs to the field of hydrogen production explosion prevention and treatment of a wet dust removal system. The industrial hydrogen inerting agent which is efficient, non-toxic and low in cost is developed through a simple water-based extraction process by taking a renewable plant resource purple-leaf plum leaf as a raw material, the behavior that active metal dust in a wet dust removal system generates hydrogen when encountering water can be effectively inhibited, and gas explosion caused by hydrogen accumulation in the system is prevented. The purple-leaf plum leaf extract provided by the invention is used as a hydrogen explosion inerting agent of a wet dust removal system and has the characteristics of economy, environmental protection and degradability.

The utility model discloses a gas explosion fountain device with the spraying height of 25 meters. The gas explosion fountain device comprises a frame system, a compressed air system, a gas storage system, a water storage system, a nozzle system, a lighting system, a U-shaped pipeline connecting system and an air pipeline connecting system. The fountain is higher in spraying height, compact in equipment size, easy to install, low in operation and maintenance cost and free of potential safety hazards.

The application discloses a piezoelectric high-pressure detonation mud cake cleaning device for a shield cutter, which comprises a plurality of through holes formed on the shield cutter, and gate valves and piezoelectric gas explosion mechanisms arranged at the front end and the rear end of the through holes respectively; the piezoelectric gas explosion mechanism comprises an alternating current transformer, a piezoelectric ceramic, an inflation mechanism and a sealing plate; the gate valve comprises an electromagnetic valve and a gas explosion valve; the gas explosion valve comprises a cylinder, a compression spring and a piston rod, the front end surface of the cylinder is provided with a sealing end plate and is provided with a through hole in the center, one end of the piston rod penetrates through the through hole and is fixedly provided with a top plate, the other end of the piston rod is fixedly provided with a disc and is slidably connected with the inner wall surface of the cylinder, and a gas explosion channel is formed in the wall surface of the cylinder; a plurality of booster channels are formed in the outer surface of the top plate, and a flexible sealing bag is sealed on the outer surface of the top plate. The piezoelectric high-pressure detonation mud cake cleaning device has the advantages that it is suitable for the narrow space of the shield cutter, and the piston rod and the flexible sealing bag on the top plate realize the secondary cleaning of the mud cake.

The utility model discloses an anti-reflux device used under a mine, which comprises a fixed plate fixedly mounted on a wall surface, the fixed plate is positioned above an adjusting air window, two support rods are vertically and forwards arranged on the front surface of the fixed plate, a separation plate is hinged below the support rods through a connecting seat, and a rotating shaft is rotatably connected between the two support rods. When coal and gas outburst or gas explosion occurs, shock waves generated by the explosion firstly impact the shock wave bearing plate, the shock wave bearing plate rotates backwards, the lap joint of the isolation plate and the shock wave bearing plate is loosened, and the isolation plate and the shock wave bearing plate naturally rotate and droop. An adjusting air window or a belt hole is closed, poisonous and harmful gas is prevented from diffusing out of the air door, and safety risks are reduced.

The coal mine gas explosion early warning protection device comprises a cleaning box, one side of the cleaning box fixedly communicates with a mixing cover, one side of the mixing cover is provided with a first draught fan, an air inlet of the first draught fan fixedly communicates with an air inlet pipe, and a plurality of rotating sleeves are rotationally assembled between the inner walls of the two ends of the mixing cover; a third fan is fixed to the rear wall of the cleaning box, an air outlet of the third fan fixedly communicates with a conveying pipe, branch pipes fixedly communicate with the end of the conveying pipe, the outer ends of the multiple branch pipes penetrate through the mixing cover, exhaust ports are evenly formed in the outer wall of the rotating sleeve, and fan blades are fixedly installed on the outer wall of the rotating sleeve. Fresh air is fed into a rotating sleeve through a conveying pipe and a branch pipe by a third fan and then is exhausted through an exhaust port, gas entering a mixing cover drives fan blades to rotate, so that the rotating sleeve rotates, the exhaust port can exhaust gas at different positions, the fresh air is driven by the fan blades to be mixed with the gas, and the gas mixing efficiency is improved. And the concentration of the gas in the mine can be better diluted.