620results about "Gas removal" patented technology

The invention discloses a gas extraction dynamic regulation and control system and method based on three-dimensional modeling, and relates to the technical field of three-dimensional modeling, and the method comprises the steps: constructing an underground multi-source sensor network, and collecting underground gas extraction multi-modal data flow; the method comprises the following steps: acquiring an underground gas historical extraction data set, performing dynamic early warning analysis in combination with an underground gas extraction multi-modal data flow, and establishing a gas emission abnormity early warning model and an extraction system failure early warning model; self-adaptive fusion modeling is carried out, and a three-dimensional model of the extraction drilling system is generated; and the gas emission abnormity early warning model and the extraction system failure early warning model are mapped to the extraction drilling system three-dimensional model for extraction regulation and control analysis to determine target gas extraction control parameters, and extraction closed-loop regulation and control are carried out. The technical problem of monitoring and regulation response lag caused by gas extraction data islanding in the prior art is solved, and the technical effects of real-time sensing, intelligent early warning and accurate regulation in the gas extraction process are achieved.

The invention relates to the field of coal seam anti-reflection, and particularly discloses a coal seam carbon dioxide and static expanding agent synergistic anti-reflection system and method. Slurry prepared by mixing a static expanding agent and water is injected into the expansion fracturing drill hole, in the process that the static expanding agent is subjected to hydration reaction and generates expansion stress, carbon dioxide gas is injected into the expansion fracturing drill hole through the carbon dioxide gas injection pipe, carbon dioxide and the hydration product of the static expanding agent are subjected to carbonization reaction to generate larger expansion stress, and the expansion fracturing drill hole is formed. Expanding the coal body fractures to form expansion fractures; the carbon dioxide is driven by differential pressure to seep into a coal matrix along expansion fractures, and adsorbed gas is driven to be desorbed into a free state through a competitive adsorption effect; and under the combined action of extraction negative pressure and carbon dioxide displacement, the free-state gas moves from the fracture channel to the extraction drill hole, and extraction is conducted through the gas extraction system. Carbon dioxide and the static expanding agent cooperate to improve permeability of the coal body, the displacement effect of carbon dioxide on gas is promoted, and the gas extraction effect is improved.

The invention discloses an active treatment method for multi-source residual coal gas of a waste mine, which comprises the following steps: firstly, hydraulic fracturing pressure relief permeability improvement and overlying strata separation layer grouting reinforcement are cooperated, the hydraulic fracturing pressure relief permeability improvement establishes a netted fracture network in a coal body to realize permeability improvement, and the overlying strata separation layer grouting reinforcement compacts goaf gangue through grouting and reinforces an overlying strata to form a continuous bearing consolidation body; and therefore, a pressure relief and permeability increasing-strengthening and reinforcing integrated structure is formed, a stable structure and a penetrating seepage network are provided for subsequent displacement and gas extraction, and the subsequent gas extraction efficiency is guaranteed. Then low-temperature liquid CO2 is injected into the coal seam through the injection well, gas displacement and desorption are conducted on gas adsorbed in the coal seam under the action of phase change and competitive adsorption, expansion and development are conducted on fractures to enable permeability to be secondarily enhanced, and meanwhile part of CO2 obtained after displacement is retained and sealed in a coal body and a goaf; on the premise that the gas extraction concentration and efficiency are effectively improved, CO2 can be stored, and the dual effects of resource utilization and carbon storage are achieved.

The invention discloses a CO2 directional fracturing target layer crack propagation simulation control method based on flow regulation and control. The method comprises the steps that a plurality of experimental coal samples are manufactured, and drill holes are formed; the fracturing pump inputs CO2 with set flow into the coal sample through the CO2 injection pipeline; the high-frequency dynamic pressure sensor collects fluid pressure data in the coal sample crack; the acoustic emission sensor monitors and obtains the crack initiation moment and crack initiation pressure of the coal sample; the method comprises the following steps: carrying out cracking and crack width monitoring on a coal sample, calculating a theoretical value of crack initiation pressure and a theoretical value of CO2 injection flow of the coal sample, injecting supercritical CO2 fluid into the coal sample, obtaining a first-stage correction coefficient and a second-stage correction coefficient of the CO2 injection flow, and calculating a corrected CO2 injection flow value. According to the method, under the multi-physical-field coupling environment, the crack initiation pressure of the coal body can be accurately measured and calculated, the correlation between the CO2 injection flow and the crack width of the coal body is established, and the CO2 injection flow better meets the actual requirements of field operation through a CO2 injection flow grading correction mechanism.

The invention discloses an impact-outburst hybrid dynamic disaster prediction method based on energy chain type evolution, and relates to the technical field of coal mine underground dynamic disaster prediction. According to the method, roadway impact-outburst hybrid dynamic disaster energy under different surrounding rock mechanical parameters, gas parameters and impact load parameters is solved through automatic numerical simulation, and an impact-outburst hybrid dynamic disaster energy data set under various working conditions is automatically constructed. The invention provides a CNN-LSTM-Attention roadway impact-outburst hybrid dynamic disaster energy prediction model with energy and spatial feature constraints, the CNN model extracts roadway spatial features, the LSTM model obtains an energy sequential sequence, Attention automatically allocates space-time double-region attention mechanism weights, the three models are cooperatively fused, and the energy prediction efficiency of the roadway impact-outburst hybrid dynamic disaster energy prediction model is improved. And the energy prediction accuracy of the roadway impact-outburst hybrid dynamic disaster is improved.

The application discloses a through-layer drilling ring flow supply self-cleaning and blocking integrated hole bottom extraction non-jetting drill tool, which comprises a multifunctional rod body, an extraction inner group pipe, a radial cavity forming nozzle, an axial blocking nozzle, a conical hole screen plate strip, an air inlet transition piece, a cross-border air inlet pipe, a compression spring slide valve assembly and a ring flow opening and closing drill bit. The special slide valve control mechanism is adopted, the original radial cavity forming jet flow is reserved, and the instantaneous axial blocking jet flow is added, so that the conical hole screen plate strip is self-cleaned and blocked. The cross-border air inlet pipe and the transition air inlet piece are combined and sealed, so that the radial air inlet channel passes through the axial flow supply channel without air and water leakage. The ring flow supply anti-backflow opening and closing drill bit is designed, and the jet flow water medium pollution problem and the drill bit opening and closing problem are solved.

The invention relates to the technical field of coal mine gas control and CO2 geological storage, and particularly discloses a soft coal seam dynamic fracture self-adaptive CO2 displacement-anti-reflection integrated system which comprises a dynamic fracture monitoring unit, a CO2 collaborative anti-reflection unit, a self-adaptive regulation and control unit and a safety protection unit. The dynamic fracture monitoring unit is used for capturing coal seam fracture development dynamics and gas injection process parameters in real time; the self-adaptive regulation and control unit is in communication connection with the dynamic fracture monitoring unit, and the CO2 synergistic anti-reflection unit is in control connection with the self-adaptive regulation and control unit and is used for realizing CO2 enhanced anti-reflection displacement; the safety protection unit is used for guaranteeing system operation safety. According to the method, real-time adaptation of the coal seam fracture state and the injection-production parameters is achieved, the problems that in a traditional fixed parameter mode, the displacement efficiency attenuation is fast, and the coal body stability is poor are solved, the CH4 recovery rate and the CO2 storage rate are increased, and the safety and high efficiency of soft coal seam gas control operation are guaranteed.

The invention discloses a coal seam gas nitrogen injection flow-increasing enhanced extraction effect evaluation method, which realizes accurate quantitative evaluation of a nitrogen injection displacement effect through a method of combining standard displacement efficiency experimental determination and actual displacement efficiency dynamic calculation. The problem that the nitrogen injection flow increasing effect cannot be objectively evaluated and dynamically optimized in the prior art is effectively solved; through a displacement range determination method and a multi-parameter real-time monitoring mechanism aiming at different mine geological conditions, the environmental adaptability of the evaluation system is remarkably improved; by combining a closed-loop optimization strategy constructed by a deep learning model, nitrogen injection parameters can be automatically adjusted and the extraction trend can be predicted according to real-time data, the gas extraction efficiency is improved while safe production of a mine is guaranteed, the nitrogen injection operation cost is reduced, and efficient and reliable technical support is provided for comprehensive treatment of coal mine gas.

The invention provides a grouting-curing-intercepting cross-cut rapid coal uncovering method, and relates to the technical field of cross-cut coal uncovering. The method comprises the steps that drilling topological mapping is conducted on a target area, a connected gas interception and extraction network is constructed, and gas attenuation characteristics are extracted to determine a grouting permeation resistance coefficient; then, a high-pressure grouting dynamic pressurization gradient sequence is formulated, and an in-situ test execution unit is configured in a negative pressure guide reserved area; establishing a process response state diagram containing bag strength, sieve tube smoothness and crack filling test nodes, generating an optimal grouting path by adopting closed-loop feedback logic, and collecting a multiphase flow grouting response data set; and finally, generating a complete solidification curtain map by using the data set, executing a solidification-gas interception collaborative verification decision, and outputting a safe coal uncovering instruction. By means of digital closed-loop control, accurate solidification of superfine cement on coal seam microcracks and efficient interception and extraction of gas are achieved, and the safety and operation efficiency of cross-cut coal uncovering are remarkably improved.

This invention discloses a method for eliminating fracturing islands in the roof and floor of a fractured and soft outburst-prone coal seam through drilling and drainage. The method involves two stages: the first stage uses directional long boreholes in the roof for hydraulic fracturing, constructing a network of fracturing fractures within each fracturing section of the target coal seam via hydraulic perforation, and then implementing networked gas extraction to enhance regional permeability; the second stage addresses fracturing islands formed between adjacent fracturing sections during the segmented hydraulic fracturing of the roof by using floor boreholes and high-pressure water injection to forcibly remove fragmented, water-bearing coal from the target coal seam, followed by networked gas extraction to eliminate these fracturing islands. This invention utilizes roof hydraulic fracturing and bottom drainage roadway drilling for synergistic coal seam gas control. High-pressure water injection forcibly removes the coal-water mixture accumulated at the bottom of the coal seam, effectively eliminating fracturing islands and gas extraction blind spots, achieving safe and efficient permeability enhancement and gas extraction.

This utility model discloses a gas staged extraction pipeline structure, including an upper branch pipe, a lower branch pipe, and a connecting pipe. The upper branch pipe is located above the lower branch pipe and the two are connected by the connecting pipe. Multiple connecting pipes are provided, spaced at predetermined intervals. Each connecting pipe connects to a borehole extraction pipe, which in turn connects to a borehole. One end of the upper branch pipe is closed, and the other end is connected to the main gas pipe via a branch pipe. One end of the lower branch pipe is also closed, and the other end connects to a water drainer. By setting up the upper and lower branch pipes and connecting them with the connecting pipe, which is then connected to the boreholes, the gas and accumulated water from each borehole are discharged together into the short connecting pipe. Gas enters the upper branch pipe, and accumulated water enters the lower branch pipe. The upper branch pipe connects to the gas extraction pipeline, and the lower branch pipe connects to the water drainer, achieving separate extraction of gas and accumulated water, improving extraction efficiency, avoiding the need for a separate water drainer, and reducing equipment costs.

The application discloses a kind of coal mine underground mining wear-resistant active resistance-reducing drill pipe and its use method, including drill pipe body, spiral steel sheet is arranged around the outer wall of drill pipe body, spiral steel sheet is arranged along the length direction of drill pipe body, ball is rotationally arranged on the side wall of spiral steel sheet away from drill pipe body, part of ball is located in spiral steel sheet, another part is located outside spiral steel sheet.In using the application, after setting the position of drilling machine and the angle of holder, the drill bit is connected with the new wear-resistant resistance-reducing drill pipe, and then the drill bit and the drill pipe are clamped with the holder, the drill bit and the drill pipe are rotated and drilled into the coal wall or rock wall, the coal slag and rock slag generated during drilling are discharged from the drill hole through the spiral steel sheet, the rotatable ball embedded on the spiral steel sheet, the resistance during drilling process is reduced, the efficiency is improved, the drill pipe wear is reduced, and the friction heat is reduced.For the service life of drill pipe, drilling efficiency and construction safety, all have been improved.

The application discloses a gas extraction water ring vacuum pump fouling degree online detection system and method, relates to the technical field of vacuum pump fouling degree detection, and comprises a sound signal acquisition module, an excitation control module, a parameter sensing module, a signal processing module, a feature compensation module, a fouling inversion module and a model calibration module; the sound signal acquisition module is arranged on the outer wall of the pump body and is used for acquiring structural vibration signals generated in the operation process and outputting original vibration data; the excitation control module is connected with a piezoelectric excitation device and receives the operation state feedback of the sound signal acquisition module, is used for triggering the piezoelectric excitation device to apply high-frequency pulse signals to the pump shell when the suction negative pressure fluctuation is stable and continuously meets the steady-state condition, and synchronously starts the sound signal acquisition module to collect response signals; and the parameter sensing module is used for monitoring the cooling water inlet / outlet temperature and motor current waveform and outputting environmental and operation parameters.

The invention discloses a directional blasting ring capable of synchronously constructing a gas extraction channel and application of the directional blasting ring. The directional blasting ring takes a semi-circular-ring-shaped steel structural part as a supporting body, the supporting body is composed of an outer arc steel plate and an inner arc steel plate, and a hollow cavity penetrating in the axial direction is formed between the outer arc steel plate and the inner arc steel plate; the support body forms a directional opening on one side of the inner arc steel plate by utilizing the arc recess of the inner arc steel plate; a rock stratum extraction pipe is arranged in the hollow cavity in the axial direction, a rock stratum extraction channel is formed by the rock stratum extraction pipe, and the portion, located in the hollow cavity, of the rock stratum extraction channel is surrounded by a supporting body. And a grain is placed in the arc recess of the inner arc steel plate, so that the grain gathers energy by utilizing the arc recess of the inner arc steel plate, and directional blasting is implemented towards one side of the target coal seam by utilizing a directional opening formed by the arc recess. According to the method, the gas treatment efficiency is effectively improved by synchronously constructing the gas extraction channel.

The utility model belongs to the field of coal mine drilling blowout prevention holes, and aims to solve the problems that water and coal cinder in a hole easily and directly enter a main pipeline, gas fluctuation is easily caused by opening small negative pressure, and hidden dangers are caused to production efficiency and production safety in a traditional gas-water separation device. The utility model provides a common drill four-hole gas-water separator which comprises an upper-layer barrel, a lower-layer barrel and a pipeline connected between the upper-layer barrel and the lower-layer barrel. The upper surface of the upper-layer barrel body is provided with a pipe orifice for connecting a main pipeline negative pressure, an orifice blowout preventer, an orifice standby negative pressure and a hole wall standby negative pressure; the lower-layer barrel is located at the lower end of the upper-layer barrel, a second valve is arranged at the bottom of one side of the lower-layer barrel, and a first valve is arranged on a pipeline between the upper-layer barrel and the lower-layer barrel. The device is high in reliability, the problem that water and coal slag enter an extraction system in the drilling machine construction process can be effectively solved, and gas fluctuation caused by water drainage is avoided.

This invention discloses a valve control device and system for extraction pipelines and its usage method, including a valve drive motor, a valve drive linkage, a trolley, and a track. The valve drive linkage is fixed to the rotational power output shaft of the valve drive motor, and the valve drive motor is fixed to the trolley via a motor frame. The trolley can slide along the track. The trolley drives the valve drive motor to move, and the valve drive linkage controls the valve status of each borehole pipeline. This invention controls the valve drive motor to rotate the valve drive linkage, thereby driving the valve wrench to rotate, achieving valve control of the extraction pipeline. Furthermore, by moving the trolley, the valve drive motor and valve drive linkage are moved and positioned, enabling valve control of multiple extraction pipelines. Compared to previous methods using explosion-proof electric three-way valves and explosion-proof electric check valves, this invention offers advantages such as low cost, small size, light weight, easy installation, no need for significant modifications to the extraction pipelines and valves, and a simple control system.

The invention belongs to the field of coal seam gas extraction, and discloses an upper and lower rock stratum drill hole collaborative arrangement method for inclined soft outburst coal seam extraction, which comprises the following steps of: forming a first drill hole in a lower rock stratum below a coal seam, and forming a second drill hole in an upper rock stratum above the coal seam; the first drill holes and the second drill holes are arranged along the trend of the coal seam; staged hydraulic fracturing treatment is carried out in the first drill hole, so that a fracture network used for flow guiding is formed in the lower rock stratum and the adjacent coal seam, and particulate matter is added after fracturing and serves as a first propping agent to prop a fracturing gap; by means of the inclination angle of the coal seam, liquid and waste residues in the fracture network are automatically discharged through the first drill hole depending on gravity, and meanwhile gas in the kerfs is extracted through the second drill hole; the problems that in the prior art, the drainage function and the extraction function are mixed, the drilling hole arrangement does not conform to the gas-water natural separation rule, fracturing fluid and gas interfere with each other in an extraction system, and stable and effective gas extraction is difficult to achieve are effectively solved.

The utility model relates to the technical field of gas control, in particular to a drilling blowout preventer for gas control, which comprises a single two-cavity pneumatic delay gas-water-slag separating device, one end of the outer surface of the single two-cavity pneumatic delay gas-water-slag separating device is fixedly connected with a fixing pipe, and one end of the fixing pipe is fixedly connected with a fixing flange. According to the drilling blowout preventer for gas control, due to the arrangement of the single two-cavity pneumatic time-delay gas-water-slag separation device, the fixing pipe, the connecting pipe, the positioning pipe and the air bag, when the drilling blowout preventer is used, the single two-cavity pneumatic time-delay gas-water-slag separation device can conduct two-stage separation on gas, water and slag, a two-cavity locking gas sealing chamber structure is adopted, and the gas-water-slag separation device can conduct two-stage separation on the gas, the water and the slag; a pneumatic delay valve element is used for acting according to a certain time period to alternately open and close water slag discharge port valves of the two cavities, gas, water and slag are automatically separated in the closed cavities, space body exchange in the extraction state is achieved, gas overflow is effectively eradicated, and gas alarm over-limit of the environment nearby drilling is prevented.

The utility model belongs to the technical field of coal mine disaster prevention and control, and particularly relates to a coal mine goaf disaster control system which comprises a discharge unit, an extraction unit, a fire preventing and extinguishing unit and a control unit. The discharging unit comprises a discharging pipeline, one end of an inlet of the discharging pipeline penetrates through the closed wall to enter the goaf, one end of an outlet of the discharging pipeline is connected with a check valve and arranged in the return airway, the extraction unit comprises an extraction pipeline, and one end of the extraction pipeline is connected with the discharging pipeline through a three-way valve. The other end is sequentially connected with the filter pump, the filter compressor and the storage part; the fire preventing and extinguishing unit comprises a nitrogen injection pipeline, one end of the nitrogen injection pipeline is connected with the nitrogen supply component, and the other end penetrates through the closed wall and is inserted into the goaf; the control unit comprises a processing module and a gas detection assembly and is used for work conversion among the discharging unit, the extraction unit and the fire preventing and extinguishing unit. The device can be used for carrying out self-adaptive adjustment treatment on gas in various modes, and is high in safety performance and better in treatment effect.

A kind of block discrete element-finite element combined modeling gas enrichment zone intelligent identification method, collects the stratum geological data and mine production data of abandoned mining area;Obtain stratum mechanical parameters and gas occurrence parameters;Establish a three-dimensional mine geological model in block discrete element UDEC;Carry out excavation, balance simulation of stoping section, and extract the stope fracture image after excavation;The stope fracture image is imported into image recognition software Coreldraw, and the coordinates of each stope fracture are obtained;A space grid model is established in MATLAB, and the permeability is given by using the relationship between the coordinates of the stope fracture and the space grid;The obtained permeability is imported into finite element software COMSOL in the form of interpolation method for gas flow simulation, and the gas emission and enrichment area are comprehensively determined. This method can accurately determine the enrichment area of underground gas in abandoned stope, and can provide scientific guidance for the layout of ground gas extraction well.

The utility model provides an auxiliary punching device for coal mining, and relates to the technical field of coal mining equipment, the auxiliary punching device comprises a movable punching vehicle and an auxiliary assembly, when the auxiliary punching device is used, a main body frame is moved to a designated punching position of a coal face, main body supporting legs are adjusted, the main body frame is perpendicular to the surface of a coal seam, and if the coal seam is complex and the ground is uneven, the auxiliary assembly is started; when the main body supporting legs are used for supporting, the four main body supporting legs can have the conditions of infirm supporting, non-uniform supporting area and insufficient supporting levelness, and at the moment, the positioning and guiding piece is unfolded and adjusted to ensure that the end part of the positioning and guiding piece is kept away from the uneven ground; the end of the positioning guide piece is tightly attached to the surface of the coal seam, meanwhile, the main body frame is perpendicular to the surface of the coal seam, the initial position and direction of drilling are determined at the moment, then the auxiliary supporting piece is unfolded and supported on the ground, extra supporting force is provided for the main body frame, and the stability of the main body frame in the working process is guaranteed.

The present application belongs to the field of coal mine gas control, and particularly relates to a floor gas extraction control method based on floor rock excavation and hole expansion. The present application forms a U-shaped large-diameter floor extraction hole system connected with the upward transportation roadway and the upward air return roadway in the soft rock floor on the basis of the existing U-shaped single-lane arrangement system, wherein the air return floor extraction hole is located in the floor mining fissure zone directly below the O-shaped ring of the stoping working face, thereby being connected with the goaf after the working face is mined. The U-shaped large-diameter floor extraction hole system constitutes a second air intake and return system, which is independent of the air intake and return system of the U-shaped single-lane arrangement system, the air volume can be freely adjusted, the interference with the air intake and return system of the U-shaped single-lane arrangement system can be reduced, the gas control effect is improved, and the emergency treatment capacity can be increased. By setting the U-shaped large-diameter floor extraction hole system, the existing floor extraction roadway or roof extraction roadway can be replaced, thereby greatly reducing the construction workload of the floor extraction system.

The application discloses a far-near field cooperative roof cutting method and relates to the technical field of roof cutting. It comprises the following steps: using single hydraulic prop to cooperate with metal hinged roof beam and cross beam to pre-support the roof of the roadway, wherein the pre-roadway reinforcement is performed before the working face is mined, and the length of the pre-roadway reinforcement of the roadway to be left is appropriately lengthened, considering that the directional pre-splitting cutting hole is better in cutting seam outside the pre-pressure range. The application has the beneficial effects that: when in use, the pre-splitting roof cutting and the forced roof falling of the goaf block most of the mining pressure transmission to the roof of the roadway to be left, and the falling gangue supports the roof of the roadway to be left, thereby ensuring the stability of the roof of the roadway to be left along the goaf, and auxiliary support is performed during the roof cutting, so as to prevent the deformation of the roadway to be left from being too large and affecting the roadway to be left.

The invention relates to a rapid outburst elimination system for cross-cut coal uncovering. The rapid outburst elimination system comprises an extraction pipe, an injection pipe and an ultrasonic transducer which are arranged in a drill hole. The outer end of the injection pipe is connected with a gas injection stop valve, a pressure pump, a heater and a carbon dioxide storage tank through an injection pipeline, a four-way valve is arranged on the injection pipeline between the injection pipe and the gas injection stop valve, and the four-way valve is connected with a temperature sensor and a gas injection pressure gauge; the outer end of the extraction pipe is connected with a heat exchanger, a gas separation tower, a pressure adjusting device and an extract separation tower through an extraction pipeline; the upper end of the extract separation tower is connected with a carbon dioxide storage tank through a circulating pipeline; and the outer end of the ultrasonic transducer is electrically connected with the ultrasonic generator. According to the ultrasonic-assisted supercritical carbon dioxide cyclic extraction anti-reflection technology, organic matters in the coal seam can be extracted through supercritical carbon dioxide, so that the permeability of the coal seam is improved, and the technology is reasonable in structure, simple in device, convenient to implement, safe and reliable.

A sleeve signalling system enables robust, mechanical and highly visible binary signalling. The system comprises an elongated signalling element comprising a signal marking, and a sleeve disposed over the signalling element. The sleeve is slidable along the elongated signalling element between a first position that covers the signal marking and a second position that uncovers the signal marking.

The invention relates to a slippage type cutting system of a coal mining machine, which comprises a slippage part, a non-slippage part and a slippage oil cylinder, the slippage part and the non-slippage part are in sliding connection left and right through the matching of a guide chute and a guide slide rail, and the two ends of the slippage oil cylinder are respectively hinged on the slippage part and the non-slippage part; an upper row of supporting oil cylinders and a lower row of supporting oil cylinders are further arranged at the outer end of the non-sliding part, each row of supporting oil cylinders are arranged at intervals in the front-back direction, and when the sliding part moves to the front position or the rear position relative to the non-sliding part, piston rods of the upper row of supporting oil cylinders and the lower row of supporting oil cylinders located on the front portion or the rear portion extend to the sliding part and abut against the guide sliding rails. The piston rod retracts to break away from the sliding part. When the device is applied to the mining and drilling all-in-one machine, the conveyor can be normally pushed in each coal mining stroke, a passing space does not need to be reserved for a roller which stops in the drilling operation, the gas drilling drainage operation of a working face is greatly facilitated, and the mining efficiency of the mining and drilling all-in-one machine is improved.

This invention relates to the field of mine sealing technology and discloses a fixed-point sealing device for underground coal mine boreholes, comprising: a gas extraction pipe, with two grouting and sealing mechanisms symmetrically arranged at both ends of the mine gas extraction hole sealing section on the outer wall of the gas extraction pipe; the grouting and sealing mechanism includes: a grouting bag, the outer wall of which is divided by an isolation layer into an independent sealing grout injection chamber and an external expansion coating bag, the external expansion coating bag being composed of multiple ring arrays of bag units connected end to end; and a coating supply component, which is connected to the feed end of the external expansion coating bag through a pipeline, the outer wall of each bag unit of the external expansion coating bag being provided with a bursting membrane, the bursting pressure threshold of the bursting membrane being matched with the coating spray coverage requirements; the invention adopts the design of the external expansion coating bag and the bursting membrane, which can realize the instantaneous spraying of liquid sealing coating, uniformly covering the inner wall of the extraction hole, forming an initial adhesive layer, and enhancing the adhesion between the sealing material and the hole wall.

The utility model provides a slag storing and discharging system of a drainage pipe. The slag storing and discharging system of the drainage pipe comprises a slag discharging box, an overflow pipe and a slag discharging pipe. When the slag storage and discharge system for the drainage pipe is used, liquid in the drainage pipe is discharged into the slag discharge box, coal slag in the liquid is precipitated in the slag discharge box and can be discharged through the slag discharge pipe, and the liquid in the slag discharge box can overflow from the overflow pipe below and then flow into the water drainage device. When the height of coal slag in the slag discharging box exceeds the height of the lowest overflow pipe or the lower overflow pipe is blocked, liquid in the slag discharging box can overflow from the upper overflow pipe. When an operator inspects or inspects on site, after liquid is discharged from the automatic water discharging device corresponding to the overflow pipe located on the upper portion, abnormity can be found in time, deslagging operation can be carried out, dredging maintenance can be carried out on the overflow pipe located on the lower portion, and the situation that liquid cannot be discharged from the interior of the deslagging box, and later gas drainage is affected is avoided.

The invention discloses a refined deslagging and drainage system, and relates to the technical field of operation and maintenance of coal mine gas pipelines. The system comprises a multi-sensor fusion sensing module, a dynamic adaptive control module, a graded deslagging execution module, an anti-blocking self-cleaning module, a distributed fault self-diagnosis module and a modular extensible control framework. The multi-sensor fusion sensing module collects working condition data such as slag particle concentration and pressure in a pipeline, the dynamic self-adaption control module judges working conditions and blocking risks in a grading mode and outputs accurate instructions, and the grading type slag discharging execution module adapts to different working conditions through main and auxiliary pump grading operation and energy recovery. The anti-blocking self-cleaning module cooperates with forward and reverse rotation of a pump body to prevent blocking through high-pressure pulse washing, the distributed fault self-diagnosis module monitors and early warns faults in real time, and flexible expansion and system compatibility are achieved through a modular architecture. According to the system, accurate deslagging, anti-blocking, energy-saving and stable operation under the high-concentration slag-containing working condition are achieved, and the operation adaptability and the operation and maintenance convenience are improved.

The invention relates to the technical field of gas control, and discloses a coal-pillar-free self-formed roadway 110 construction method well up-down integrated area gas control method which comprises the following steps: S1, dividing a coal resource into a planning area, a preparation area and a production area according to the time of mine construction or mining operation of the coal resource; s2, gas pre-extraction treatment on the well in the planning area; s3, advanced treatment of underground gas in the preparation area; s4, precise advanced treatment of underground gas of the working face is carried out; and S5, working face stoping. According to the method, the above-well drilling pre-extraction technology is utilized, the above-well extraction purpose of replacing space with time is achieved, accurate advanced underground extraction is conducted on gas of the continuous working face through the coal-pillar-free self-formed roadway of the upper working face in the production area, and the underground extraction purpose of replacing time with space is achieved; the supporting pressure of the working face is reduced, the stress distribution rule is changed, the pressure difference between coal seam gas and roadway atmospheric pressure is reduced, and the crossheading gas emission amount is reduced.