410 results about "Coal mine methane" patented technology

The invention discloses a gas extraction pipeline tiny leakage positioning method based on multi-sensor fusion, which belongs to the technical field of positioning, is used for gas extraction pipeline leakage positioning, and comprises the following steps: establishing a state equation and an observation equation of a motion process of an inspection robot, and realizing inspection robot positioning under a navigation system based on Kalman filtering. And realizing coal mine gas extraction pipeline leakage source positioning under a microphone array coordinate system based on a beam forming algorithm, and obtaining coal mine gas extraction pipeline leakage source positioning under a navigation system through coordinate conversion. According to the method, the leakage source position of the gas extraction pipeline under the navigation system is directly given, maintainers can conveniently and quickly reach the leakage source position, and the first-aid repair time is greatly shortened; the positioning error of the inspection robot can be effectively reduced, and the phenomenon that the positioning error is accumulated along with time when the inspection robot only uses an accelerometer and a gyroscope for positioning is avoided; the influence of background noise on a positioning result can be greatly reduced, and the spatial resolution of a leakage positioning result is improved.

The invention provides a gas extraction multi-parameter monitoring method and system based on edge calculation, and relates to the technical field of coal mine gas extraction. The method comprises the following steps: arranging multi-parameter sensor nodes in drill holes, pipelines and gas gathering stations, and accessing an edge calculation unit; performing time synchronization, zero drift correction, outlier elimination and normalization on the data of the gas concentration, the negative pressure, the flow, the temperature, the humidity and the hydrogen sulfide concentration to generate feature vectors; calling a lightweight neural network model for reasoning, and outputting an extraction efficiency score and a leakage risk degree; when the risk degree exceeds the limit, an acousto-optic alarm is triggered and a speed reduction instruction is issued; when the efficiency is insufficient, the negative pressure is adjusted; compressing and encrypting the result, and reporting the result to a cloud platform through a wireless network at regular time; and the cloud performs model incremental training based on historical data and feedback, and issues an update model through hot replacement. According to the invention, local intelligent analysis, rapid early warning and dynamic adaptive optimization are realized.

The invention relates to the technical field of data processing, and discloses a coal mining strategy analysis method and system based on coal mine gas concentration. The method comprises the steps of collecting gas concentration data through an intelligent track inspection device, performing data correction in combination with coal seam parameters to obtain concentration dynamic distribution data, performing multi-dimensional analysis based on the concentration dynamic distribution data to generate a risk thermodynamic diagram, determining differentiated mining parameters according to risk assessment, optimizing ventilation parameters through air volume regulation and control, and obtaining a risk analysis result. And finally, correlation analysis is carried out on each parameter to obtain a mining strategy scheme. The intelligent track inspection device collects gas concentration data and is matched with the sweeping assembly and the blowing assembly to keep the track clean, the detection range is expanded through reciprocating motion of the detection probe, and differential mining process parameters and ventilation regulation and control strategies are formulated in combination with multi-dimensional data analysis; the technical problems of small detection range, insufficient data analysis and unreasonable mining strategy in the prior art are solved.

The invention provides a coal mine gas extraction management and control method and system based on transparent geology, and the method comprises the following steps: integrating multi-source geological data, and constructing a transparent geological model which can reflect the actual geological condition in real time; based on geological information provided by the transparent geological model, calculating and optimizing key parameters of a drill hole in combination with coal and rock seeing parameters of a constructed drill hole to obtain preset drill hole design parameters; construction parameters and drilling parameters of drilling machine equipment are collected in real time; the drilling parameters are compared with the preset drilling design parameters; meanwhile, the drilling construction quality is analyzed and evaluated according to the construction parameters and the drilling parameters; and an extraction effect evaluation model and an extraction effect prediction model are constructed, gas parameters are collected in real time, and the gas extraction effect is evaluated. By means of the transparent geologic model, intelligent control over the whole coal mine gas extraction process is achieved.

The invention provides a mine gas emission amount measuring and calculating method and system based on an ultrasonic wind speed sensor, and belongs to the field of coal mine gas monitoring. The transmitting end and the receiving end of the ultrasonic wind speed sensor are fixed to roadway sides on the two sides of a roadway respectively, and ultrasonic echo signals in the downstream direction and ultrasonic echo signals in the countercurrent direction are collected; determining ultrasonic downwind time and ultrasonic headwind time according to the ultrasonic echo signal in the downstream direction and the ultrasonic echo signal in the countercurrent direction, calculating wind speed based on an ultrasonic time difference method speed measurement principle, and transmitting the wind speed to a cloud server; introducing a wind speed correction coefficient, and calculating the air volume of each total return airway based on the wind speed, the roadway section area and the wind speed correction coefficient; the air outlet gas discharge amount is calculated based on the air volume of each total air return way and the gas amount of the corresponding total air return way, and the total gas emission amount of the mine is calculated and displayed in combination with the total gas extraction amount; the monitoring mode that a traditional wind speed sensor replaces a plane with a point is changed, and the accurate total gas emission amount is calculated.

The invention discloses a coal mine gas concentration monitoring and early warning system, relates to the technical field of safety early warning, and aims to solve the technical problems that a traditional coal mine gas concentration monitoring and early warning system is insufficient in monitoring precision and not timely in early warning, and the coal mine gas concentration monitoring and early warning system comprises a monitoring module used for monitoring the temperature, humidity, oxygen concentration and gas concentration value of the environment in real time, the temperature, the humidity, the oxygen concentration, the gas concentration value and the position data of the monitoring nodes are transmitted to a data processing module; the self-adaptive compensation module is used for receiving the temperature, humidity, oxygen concentration and gas concentration values which are transmitted by the data processing module and monitored by the monitoring nodes in real time and correcting the temperature, humidity, oxygen concentration and gas concentration values to obtain temperature, humidity, oxygen concentration and gas concentration standard values; and a data processing module. The coal mine underground gas concentration monitoring system has the advantages of accurately and comprehensively performing real-time monitoring and effective early warning on the coal mine underground gas concentration.

The invention relates to the technical field of coal mine gas disaster prediction, in particular to a while-drilling sensing coal face gas danger area division method which comprises the following steps: S1, in a detection drill hole drilling process of a coal face, detecting the gas danger area of the coal face; the method comprises the following steps: synchronously acquiring three types of parameters: direct gas parameters, drilling kinetic parameters and hole wall geophysical parameters through a measurement-while-drilling system; the measurement while drilling system comprises a sensor array arranged on a drilling tool and a data transmission module communicating with a ground data processing system. S2, performing space-time alignment and fusion analysis on the multi-source parameters acquired in the step S1, and adopting a mode recognition method based on mutation point detection and multi-parameter association; through multi-source information fusion and dynamic coupling modeling, accurate identification and graded early warning of a gas dangerous area are realized, the detection precision and early warning timeliness are improved, and a closed-loop prevention and control system integrating perception, evaluation and management and control is formed.

The invention discloses a method for rapidly and efficiently extracting coal mine gas in a broken and soft coal seam, and belongs to the technical field of coal seam gas development and coal mine gas prevention and control. According to the method, geological features of a coal mining planning area are determined, a ground U-shaped well and underground bottom-pumped rock drift layer-crossing drilling combined treatment system is deployed, and regional large-scale treatment is achieved in a well factory mode; the fracturing transformation range and the fracturing fluid distribution characteristics are detected by using a ground and underground combined micro-seismic monitoring and underground transient electromagnetic method, and the arrangement of layer-crossing drill holes is optimized; dividing the cross-layer drill holes into drainage holes and air exhaust holes, and formulating a collaborative extraction system in combination with different drainage and extraction stages; the method solves the problems that broken soft coal seam gas extraction is low in efficiency and long in period, and treatment blind areas exist, treatment time is remarkably shortened, cost is reduced, and safe and efficient production of a coal mine is guaranteed.

The invention provides coal seam multi-section type directional fracturing and permeation increasing equipment and method, and relates to the technical field of coal mine gas treatment and coal seam gas exploitation, the coal seam multi-section type directional fracturing and permeation increasing equipment comprises a machine body, a propelling mechanism, a fracturing pipe and a liquid inlet mechanism, and a plurality of sets of directional assemblies are arranged outside the fracturing pipe at equal intervals; and the fixing mechanism is used for directionally spraying the high-pressure water to the fixed direction in the coal seam and comprises a limiting component arranged on the propelling mechanism and used for limiting the fracturing pipe stretching into the fracturing seam and a connecting component arranged on the limiting component and used for locking the fracturing pipe. High-pressure water can be directionally jetted to the fixed direction in a coal seam fracturing hole, the situation that due to the fact that the high-pressure water is jetted at will, a large number of cracks are generated on the soft portion of the coal seam, and consequently permeation increasing is uneven is avoided, in addition, a fracturing pipe stretching into the fracturing hole can be fixed, and the situation that the permeation increasing effect is affected due to the fact that the fracturing pipe shakes when equipment runs is avoided.

According to the open pit coal mine methane emission monitoring equipment, the pretreatment device, the sampling air pump and the CH4 analyzer are arranged through the mounting column, and the stability of the mounting column is ensured through the base of the triangular structure support. The pretreatment device is a three-stage progressive filtering unit, dust and steam in the open pit coal mine gas can be removed, and the obtained sample gas can be cleaner and drier and is appropriate in temperature. By utilizing suction force generated by the sampling air pump, air enters an optical cavity of the CH4 analyzer after being treated by the pretreatment device. The CH4 analyzer further comprises a laser and a CH4 optical analysis module, the laser emits a laser beam with a specific wavelength to the optical cavity, and multiple reflections are formed in the optical cavity, so that the effective optical path of the laser beam reaches a preset range; the CH4 optical analysis module measures the concentration of methane in the sample gas by detecting the light intensity change of the laser beam after the laser beam passes through the optical cavity containing the sample gas. According to the scheme, the methane emission condition of the open pit coal mine can be accurately monitored.

The invention discloses a coal face upper corner gas block extraction system which comprises an advancing mechanism, an extraction mechanism and a control mechanism. The extraction mechanism realizes goaf state monitoring and gas extraction; and the control mechanism controls the received signal to perform data analysis and processing, and reasonably issues an extraction instruction. The invention further discloses a coal face upper corner gas block extraction method. The method comprises the steps that coal face goaf extraction parameters are determined; installing an extraction system on site; starting each electric appliance part; completing information collection and processing to obtain an analysis result; a related action instruction is given according to the analysis result, adjustment of the extraction position is completed, and then gas extraction of the current area is completed; when the gas concentration of the goaf meets the safety standard, it is confirmed that extraction is completed. The invention belongs to the technical field of coal mine gas extraction and solves the problems that existing extraction equipment is unreasonable in structure and cannot extract gas in time.

The invention relates to the technical field of coal mine gas concentration prediction, in particular to a coal mine gas concentration time sequence prediction method and system based on LSTM. The method comprises the following steps: collecting multi-source data such as a mining machine pose time sequence, a micro-seismic monitoring event sequence and roadway environment monitoring, constructing a damage-permeability evolution equation by combining geological information, inverting a coal-rock mass dynamic stress damage field, calculating a gas dynamic permeability field and a gushing source intensity field, and finally predicting the gushing source intensity field by combining a space-time prediction model with historical data. And predicting future gas concentration distribution. And real-time space positioning of the coal mine gas emission source is realized.

The invention discloses a coal mine gas collaborative anti-reflection extraction method, which belongs to the field of coal mine gas extraction, and comprises the following steps: S1, drilling a plurality of vertical drilling wells and a plurality of horizontal drilling wells in a coal seam area to form a three-dimensional drilling network; s2, composite electric field fracturing is conducted, specifically, transient impact is conducted through a high-voltage pulse electric field, and then low-frequency electromagnetic waves are introduced for continuous action; s3, geothermal water in the underground abandoned mine is pumped through a high-pressure pump, the geothermal water is heated to the set temperature through a heat pump and then mixed with high-pressure nitrogen, the mixture is introduced into a wellhead of the three-dimensional well drilling network in a pulse mode, and water is pumped out after the set time and returned and conveyed into the underground abandoned mine; and S4, gas is extracted from the wellhead position through negative pressure adsorption equipment. By the adoption of the coal mine gas collaborative anti-reflection extraction method, advanced technologies such as a three-dimensional well drilling network, composite electric field fracturing and pulse type geothermal water and nitrogen mixed injection are combined, and the extraction rate is greatly increased.

The invention relates to a coal anisotropy-based cross-layer drilling gas extraction productivity prediction method, which belongs to the technical field of coal mine gas disaster prevention and control, and comprises the following steps: quantifying the sensitivity weight of a permeability main control factor, determining the evolution law of permeability under the action of different effective stresses and coal structures, and determining the permeability evolution law; determining a coal body permeability anisotropy multi-factor response mechanism; establishing a hole periphery effective stress field space function taking a radial distance, a tangential distance and an annular angle as variables, constructing a hole periphery permeability anisotropy space distribution model of the crossing drill hole, and establishing a stress-damage-seepage multi-field coupling mechanism and a permeability anisotropy time-space evolution model of a drill hole unloading area; and analyzing inter-hole interference characteristics of a plurality of cross-layer drilling extraction gas migration flow fields, a cross-layer drilling group extraction interference effect and a bedding seepage control productivity prediction model, clarifying a scale effect of a group hole topological structure and a productivity marginal decline rule, and constructing a three-dimensional cross-layer drilling group extraction productivity prediction model controlled in a bedding direction.

The invention provides a large model and retrieval enhanced intelligent gas risk studying, judging and handling method and device.The method comprises the steps that a gas over-limit alarm semantic description text is obtained, and structured risk elements are extracted through a large language model subjected to instruction fine adjustment; mapping the risk elements into standard terms based on a gas over-limit risk standardized ontology model; executing multi-dimensional weighted retrieval in the coal mine safety domain knowledge base according to a standardized result, calculating a comprehensive correlation score by combining semantics, ontology, regulations, cases and trend consistency, and screening knowledge fragments; and finally, constructing a scenario semantic context, driving the large language model to perform causal reasoning and generating a risk disposal strategy. Through ontology standardization and a multi-dimensional retrieval mechanism, the problems of insufficient specialty and illusion of a general model are solved, accurate study and judgment and scientific disposal of the coal mine gas risk are realized, and it is ensured that the finally generated risk disposal strategy has a clear regulation source and data support.

The invention discloses a coal mine methane emission estimation method based on backward Lagrange random particle simulation. The method comprises the following steps: S1, acquiring satellite methane concentration monitoring data, meteorological data, EDGAR emission list data and GFEI global fuel development emission list data of a research area; s2, selecting a pixel as an observation point, obtaining an influence factor of methane emission of a virtual emission point pixel on the methane concentration of the observation point pixel through a backward Lagrangian random particle simulation model by utilizing meteorological data to reversely track the motion trail of particles, and constructing a source receptor matrix according to the influence factor; s3, the Bayesian methane emission estimation model carries out observation and prior constraint based on the objective function to obtain posterior emission data of the research area. According to the method, the source receptor matrix is constructed by using the motion trail of the meteorological data reverse tracking particles, and the Bayesian methane emission estimation model performs observation and prior constraint based on the target function to obtain posterior emission data of the research area, so that high-precision methane emission inversion estimation of the coal mine in the research area is realized.

The invention provides a coal mine gas risk virtual deduction early warning method and system based on multi-source information fusion, and belongs to the technical field of gas risk early warning. The method comprises the steps that firstly, geological, mining and environment multi-source data are collected, and after preprocessing and feature extraction, high-dimensional risk feature vectors are fused and constructed; then, the vector is used for driving a virtual working face system containing mining, ventilation and gas emission intelligent agents to perform evolution, a Monte Carlo tree search algorithm is used for prospectively deducing a future multi-step state, and the risk entropy of each path is calculated; and finally, generating a dynamic risk probability graph based on a deduction result, and solving a Pareto optimal decision set giving consideration to safety, efficiency and economy through multi-objective optimization. According to the method, the conversion of the gas risk from passive monitoring to active early warning is realized, the problem of early warning hysteresis is effectively solved, and advanced and accurate scientific decision support is provided for gas disaster prevention and control through risk visualization and spatial positioning.

A high-position drilling and coal mining face gas extraction-treatment dynamic collaborative prediction method belongs to the technical field of coal mine gas extraction and treatment, and comprises the following steps: firstly, screening out physical parameters influencing a goaf gas extraction effect and an upper corner gas treatment effect according to a porous medium multi-field coupling theory and a field actual working condition; corresponding parameters are collected in real time to form a time sequence data set; and secondly, multivariable input and multivariable collaborative prediction are carried out by adopting a mixed LSTM-Transform method, and an online learning module is adopted, so that the dynamic capture capability of a complex multivariable time sequence mode in an underground coal mine is remarkably improved, and extraction-treatment dynamic collaborative prediction is carried out on high-position drilling and coal mining surface gas. According to the method, the gas extraction effect and the accuracy, stability and real-time performance of upper corner gas result prediction can be effectively improved, meanwhile, optimization of gas extraction pressure parameters can be achieved, and reference is provided for the high-position drilling gas extraction technology.

The invention discloses a coal mine gas cloud contour infrared spectrum inversion method. The method comprises the following steps: 1, simulating an underground gas cloud formation environment; 2, acquiring infrared image data containing gas cloud by using an infrared spectrum detection device; step 3, carrying out de-noising processing on the infrared image data; 4, performing temperature drift correction and radiation calibration on the denoised infrared image, and converting a DN value into radiation brightness; 5, based on the multi-frame de-noised image, performing target detection and contour extraction on the gas cloud by using a Methane-YOLO model, performing multi-view geometric matching of feature points, performing adjustment optimization of three-dimensional coordinates in combination with a bundle method, generating a point cloud model, and reconstructing a curved surface; 6, based on the three-layer radiation transmission model and the Lambert-Beer law, inverting the gas concentration; and step 7, based on the CEEMDAN-VMD secondary decomposition and CNN-LSTM hybrid network, carrying out joint training on the space contour and time sequence data, and carrying out three-dimensional space concentration distribution prediction.

The invention discloses a fractured zone gas extraction technology optimization method based on absolute gas emission amount, and relates to the technical field of coal mine gas extraction, and the method comprises the following specific steps: constructing a coal seam mining three-dimensional stratum model, reproducing a coal seam excavation overlying strata fracture dynamic development process, representing an overlying strata void ratio spatio-temporal evolution law by using an image processing technology, and obtaining a fractured zone gas extraction result. Obtaining an overlying strata void ratio distribution function; the permeability distribution is deduced, the gas emission amount of the working face is calculated, the gas seepage process in a fracture network is simulated, and a fractured zone gas control targeted area is delineated; a linkage control rule of extraction technical parameters on gas emission, migration and distribution is disclosed, and a fissure zone gas extraction technical library is constructed; and defining an absolute gas emission critical threshold applicable to the extraction technology, constructing a multi-factor hierarchical extraction technology optimization judgment criterion taking the absolute gas amount as a core and considering an occurrence mode, a coal mining method and a ventilation mode, and further providing an adaptive extraction technical scheme and a parameter optimization suggestion for a specific working face. According to the method, differentiated treatment of gas emission of the working face is achieved, the coal mine gas extraction effect is effectively improved, and a reference basis is provided for selecting a gas extraction technology according to local conditions.

1. Name of the designed product: coal mine gas extraction pipe elbow (series appearance). 2. Use of the designed product: used for the flow direction change of gas in the pipeline. 3. Design points of the designed product: in shape. 4. Picture or photo that best shows the design points: design 1 perspective view. 5. Design 1 is designated as the basic design.

The invention relates to the technical field of coal mine gas extraction technologies and equipment, in particular to intelligent plugging-displacement yield increasing-redundancy protection integrated equipment and method for a gas extraction drill hole. The equipment comprises a carbon dioxide displacement system, a grouting system, a gas extraction system and an intelligent control system, according to the intelligent plugging device, intelligent plugging can be conducted on the gas extraction drill hole, the sealing performance of the drill hole is guaranteed to the maximum extent, adsorption-state gas in each layer can be displaced, the gas extraction amount is increased, the gas outburst danger is reduced, redundant protection such as an emergency sealing device is additionally arranged, and the safety of extraction equipment is improved. The manual intervention cost is greatly reduced, the sealing effect of drill hole plugging is improved, compared with common drill hole plugging, the gas yield is increased, and the safety of gas extraction operation is improved.

The present invention belongs to the technical field of drilling safety plugging devices, and specifically relates to a drilling plugging device, which is designed for the existing problems of plugging the gap between the working pipe and the drilling hole in the coal mine gas drainage drilling hole. The existing grouting pipe is outside the working pipe, and there are defects such as poor sealing and non-recyclable components. The drilling plugging device of the present invention includes a working pipe, a bladder, a grouting pipe and a locking and closing component. The grouting pipe is placed inside the working pipe, and the locking and closing component can control the action of the grouting pipe according to the grouting situation of the bladder and close the grouting hole. The grouting pipe includes a main section, an abutting section and a limiting section, and the locking and closing component is composed of a closing piece, an elastic piece and a limiting piece. The device can effectively reduce the risk of gas leakage in terms of safety, ensure the safety of personnel and the mine; in terms of cost, the components can be recycled and reused to reduce losses; environmentally, it reduces the accumulation of waste. It has application and promotion value in the field of plugging gas drainage drilling holes.

The invention discloses a gas extraction and roadway environment parameter collaborative prediction system and method, belongs to the technical field of coal mine gas extraction and safety monitoring, and aims at improving the precision and accuracy of gas concentration prediction and improving the working face gas extraction efficiency and safety. The system comprises a wind speed acquisition system, a fire beam tube monitoring system, a high-position drilling gas extraction monitoring system, a corner gas concentration monitoring system, a PLC (programmable logic controller) and a computer. A partial differential physical equation and related information of boundary conditions and initial value conditions of the partial differential physical equation are integrated into a loss function of a full-connection neural network, a neural network model approaching a partial differential equation solution is obtained through learning, a mapping relation between gas extraction parameters and extraction effects is established, flow characteristics of gas in a coal mine tunnel are accurately simulated and predicted, and the gas extraction efficiency is improved. And gas over-limit early warning can be carried out, so that a guarantee is provided for safe production of a stope face.

The invention discloses a method and a device for determining the gas content of a coal body by using tunneling face gas emission parameter inversion, and relates to the technical field of coal mine gas detection and safety. The method comprises the following steps: acquiring gas concentration, wind speed, roadway section parameters, geological parameters and environmental parameters of a tunneling face through a multi-parameter dynamic acquisition system; on the basis of the collected parameters, gas emission quantity characteristic values are calculated according to drilling operation shifts and non-drilling operation shifts through a dynamic inversion algorithm, and the gas content of the coal body in the current area is inversed; a coal sample is collected through an underground one-stop measuring system, the accurate gas content is measured, and parameters of a dynamic inversion algorithm are optimized; and inputting the multi-source data into an intelligent inversion and early warning system to obtain a predicted value of the gas content in front of the tunneling face and a gas outburst risk level, and adjusting the acquisition frequency and an inversion model. A measurement closed loop is formed, the measurement accuracy and timeliness of the gas content are improved, and the safety of coal mine tunneling operation is guaranteed.

The invention relates to an excavation arrangement method for advanced treatment of roadway combined large-area gas, and belongs to the technical field of coal mine gas prevention and control. The method comprises the following steps that firstly, a mining area system is constructed, and a main vertical shaft, an auxiliary vertical shaft, a main transportation roadway, a main rail roadway and a mining area uphill are arranged; a ventilation vertical shaft is constructed at the boundary of a mining area, and regional advanced directional long drill holes are formed in a shaft bottom concentrated parking lot and the middle section of an uphill of the mining area for gas pre-extraction; an extraction pump room is arranged on the ground and connected with the drill hole through a ventilation vertical shaft to form a gas extraction system; after coal seam gas is pre-extracted, a coal roadway is constructed to connect the mining area uphill and the ventilation vertical shaft, a negative pressure ventilation system is formed, and partition ventilation is achieved; advanced directional drill holes or conventional parallel drill holes can be further constructed in the coal roadway to pre-pump coal seam gas adjacent to the stope face. Through combined arrangement of the well and the roadway, the functions of efficient extraction of underground gas, partition ventilation, emergency rescue channels and the like are achieved, the underground gas extraction system has the advantages that one well has multiple purposes, the gas treatment efficiency is improved, the ventilation path is shortened and the like, and the safety and economical efficiency of a coal mine are remarkably improved.

The present invention discloses a pumping and drainage device, which relates to the technical field of coal mine gas drainage. The pumping and drainage device includes a pumping and drainage assembly and a flushing assembly. The pumping and drainage assembly includes a pumping and drainage pump, a liquid storage tank and a pumping and drainage head. The pumping and drainage pump and the pumping and drainage head are both connected to the top of the liquid storage tank. The pumping and drainage pump can extract the air in the liquid storage tank and generate negative pressure to attract the coal water in the downward hole to the liquid storage tank through the pumping and drainage head. The flushing assembly includes a flushing pump and a switching mechanism connected to each other. The pumping and drainage head is connected to the top of the liquid storage tank through the switching mechanism. The switching mechanism can selectively connect the flushing pump with the liquid storage tank, connect the flushing pump with the pumping and drainage head, or connect the top of the liquid storage tank and the pumping and drainage head. The flushing pump can inject water into the liquid storage tank when connected to the liquid storage tank to flush the liquid storage tank, and the flushing pump can also supply water to the pumping and drainage head when connected to the pumping and drainage head to flush the pumping and drainage head. The pumping and drainage device can drain the accumulated water in the downward hole and has the characteristics of good pumping and drainage effect.

The invention relates to the technical field of coal mine security and protection, in particular to a coal mine gas detection and early warning intelligent control system based on the 5G communication technology. The invention aims to provide a coal mine gas detection and early warning intelligent control system based on a 5G communication technology in order to overcome the defects existing in an existing coal mine underground working face coal mine gas detection and control system. The system is suitable for effectively detecting the concentration of the combustible gas on the working face in the coal mining process, accurately, intelligently and quickly reducing the concentration of the combustible gas exceeding the set concentration, and transmitting the real-time concentration of each detection point on the working face to the central control system for display. The gas detector can conveniently and directly check the gas concentration of each gas detection point in a monitoring room, time and labor are saved, the safety is good, and the gas detector is convenient to popularize and use. And life and property safety of workers on the mine working face is guaranteed.

The invention relates to the technical field of coal mine gas geological disaster prevention and control and intelligent identification, and discloses an underground coal mine gas geological abnormal body intelligent identification and grading early warning method and system, and the method comprises the steps: S1, collecting multi-source heterogeneous monitoring data in an underground coal mine target region, and carrying out the standardization processing and time-space reference unification; s2, constructing a multi-dimensional feature fingerprint database based on a historical or accumulated standardized data set; s3, acquiring real-time multi-source monitoring data for the current tunneling process or detection process, and extracting features of the real-time multi-source monitoring data; based on the multi-dimensional feature fingerprint database, adopting an evidence theory to carry out fusion calculation on a plurality of extracted real-time feature evidences to obtain a comprehensive confidence identification result of a specific type of gas geology anomalous body existing in a front unrevealed area; and S4, generating graded early warning information according to the comprehensive confidence identification result and a preset risk grade threshold. According to the invention, advanced identification, risk assessment and targeted early warning of geological disasters such as underground gas outburst are realized.

The invention discloses a large-dip-angle coal seam group coal roadway strip advanced fracturing and gas extraction method, and relates to the technical field of coal mine gas extraction. The method comprises the following steps: arranging a crossing hydraulic fracturing drill hole in an overlying first coal seam roadway to form an anti-reflection crack; a directional long drill hole of the coal seam is formed in the position of a to-be-tunneled roadway of the underlying coal seam, and strip advanced fracturing is formed based on the fracture extending direction; and ordered connection of drilling construction, gas pre-pumping, roadway tunneling and simultaneous tunneling and pumping is realized through closed-loop operation. The drilling distance, the hole sealing length and the pump injection parameters are optimized, the gas extraction period is remarkably shortened, the coal wall gas emission amount is reduced, and the tunneling efficiency is improved. According to the method, the problems of low gas extraction efficiency and high safety risk of the large-dip-angle coal seam group are effectively solved through a combination mode of gas extraction and strip advanced fracturing, the method is suitable for various coal seam conditions, and the safety and sustainability of coal mine production are remarkably improved.