72 results about "Soft Coals" patented technology

The invention provides a high-quality cross-boundary continuous grading support system suitable for a soft coal rock roadway in a complex environment, which relates to the technical field of coal mine roadway support and comprises a first-stage foundation support system, a second-stage reinforced support system and an intelligent monitoring system, the first-stage foundation support system, the second-stage foundation support system and the third-stage foundation support system cooperate with one another to achieve continuous graded support and long-time stable control of roadway surrounding rock, and the first-stage foundation support system is used for achieving surrounding rock shallow constraint, preliminary stress release and preliminary rock mass consolidation; through continuous cooperative control of first-stage foundation support and second-stage reinforced support and application of a novel support material, rheological and swelling deformation of surrounding rock can be effectively restrained, and practical application verifies that side deformation and top deformation of a roadway are reduced, and the bulging amount of a bottom plate is controlled within safety limit values; through the design of lagging grouting full anchoring and collaborative anchoring, fractured rock mass is effectively consolidated and repaired, the stress concentration degree of surrounding rock is improved, and the problem that an existing support is poor in long-term stability is 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 device and method for preventing soft coal seam gas extraction drill hole deformation and hole collapse, and relates to the technical field of coal seam gas extraction, the device comprises an anti-collapse mechanism used for ensuring the accuracy and controllability of the reinforcing range and effectively preventing invalid slurry loss, and the anti-collapse mechanism comprises a hole protection sleeve unit, a connecting unit and a bag unit; the bag unit is arranged on the outer side of the connecting unit and comprises a stacked bag installed on the outer side of the stacked casing pipe through the connecting unit, a bottom bag is installed on the outer side of the bottom casing pipe through the connecting unit, and high-strength grout is injected into the bag unit through a high-pressure grouting pump, so that the stacked bag and the bottom bag expand in a drill hole to fill surrounding cracks; and the invalid diffusion path of the slurry is blocked, targeted reinforcement of the soft coal seam is achieved, the problem that the slurry is lost along the maximum crack channel in traditional grouting is solved, the stability of the gas extraction drill hole is remarkably improved, and the service life of the gas extraction drill hole is remarkably prolonged.

The application discloses a soft coal seam acoustic wave penetration method, comprising the following steps: sampling the rock of one side rock stratum of the soft coal seam to be penetrated, obtaining the tensile strength and shear strength of the rock, the one side rock stratum being the coal seam roof or the coal seam floor; drilling a working borehole in the one side rock stratum; implementing impact in the working borehole; the impact wave generated by the impact cracks the rock stratum around the working borehole, the impact wave cracks the rock stratum, and the acoustic wave is formed after the impact wave attenuates, the acoustic wave is used for penetrating the soft coal seam, wherein the stress wave pressure entering the soft coal seam is lower than the tensile strength and shear strength of the rock. The application solves the problems that it is difficult to develop an effective high-strength sound source capable of being loaded to the coal seam and it is difficult to implement drilling in the soft coal seam in the prior art. The application converts the strong impact into high-strength acoustic wave by using the coal seam roof or the coal seam floor rock stratum, the high-strength acoustic wave is used for penetrating and exciting the coal seam, and the required acoustic wave can be obtained, and the gas desorption is promoted.

The utility model discloses a top coal caving hydraulic support for a soft coal seam, and relates to the technical field of hydraulic supports. The top coal caving hydraulic support for the soft coal seam comprises a hydraulic support structure, the bottom end of the hydraulic support structure is movably connected with a movable base, and an adjusting type traction device is fixedly installed at the top end of the movable base; according to the top coal caving hydraulic support for the soft coal seam, by arranging an adjusting type traction device, a U-shaped plate can be driven by an extension rod to vertically slide on the outer side of a driving box, the U-shaped plate is promoted to drive a traction head to conduct height adjustment, and then height locking can be conducted on the extension rod through a gear ring in cooperation with distance adjustment of a movable rack and a fixed rack; the traction head is positioned after height adjustment, so that the support can be adjusted according to the actual traction height of field traction equipment, normal traction of external traction equipment is guaranteed, and the withdrawing efficiency of the support is improved.

The invention discloses a self-adaptive hole protecting and sealing device and method for soft coal seam gas extraction drilling, the device comprises a sectional type screen pipe, an active hole protecting assembly and a hole sealing assembly, the active hole protecting assembly comprises a multi-section type center hollow rod, a cable and a dynamic hole protecting supporting array; the dynamic hole protection supporting array comprises a supporting unit which stretches out and draws back in the radial direction of the multi-section type center hollow rod, and the supporting unit is used for actively supporting the drilling hole wall and adjusting the supporting force in a real-time and self-adaptive mode. Through a dynamic sensing-active regulation-cooperative sealing closed loop mechanism, the defect of separation of static passive sealing and hole protecting and sealing is overcome. The network distributed electric push rod carries a sensor to monitor hole wall changes in real time, supporting force is independently adjusted, and real-time dynamic hole protection is achieved. And the automatic liquid supplementing cavity is matched with the double-back-pressure valve to automatically maintain the sealing pressure. Hole protecting and hole sealing are in two-way coupling linkage, dynamic sensing and real-time self-adaptive adjustment can be achieved, effective sealing of a drilled hole can be maintained all the time, and organic unification of active hole protecting and hole sealing can be achieved.

The utility model relates to the technical field of coal mining, especially relates to a soft coal seam drilling hole wall stability reinforcing device, including the drill rod installation head, the outer surface of drill rod installation head is provided with the first outer thread, the rear end of drill rod installation head is fixedly connected with the guide assembly, the outer surface front part of guide assembly is fixedly sleeved with the grouting assembly, the outer surface middle part of guide assembly is movably sleeved with the support reinforcing assembly. The utility model discloses a soft coal seam drilling hole wall stability reinforcing device, through inflatable rubber support ring inflation, makes it swell and lets the embedding convex head embeds the hole wall, and the pre-support is formed quickly, and then the slurry is injected into the guide sleeve, and the slurry flows out from the annular array distribution slurry outlet hole and penetrates the coal seam fracture, and the inflatable rubber support ring and the solidified slurry jointly reinforce the hole wall, greatly improve the hole wall stability and the anti-deformation ability, guarantee the safety of soft coal seam drilling operation.

The invention relates to the technical field of coal mine safety engineering, in particular to water injection equipment and a water injection method for a strong-adhesion difficult-to-wet three-soft coal seam. The equipment systematically integrates a water injection pressure adjusting device, a moistening agent adding device, a water injection monitoring device and a protection device. According to the invention, by constructing a closed-loop feedback intelligent water injection system, the technical bottlenecks of poor water injection wettability, non-uniform water transverse dispersion and sweating or water leakage caused by easy plastic deformation of the coal wall due to complex coal body pore structure and low surface free energy in the strong-adhesion and difficult-to-wet three-soft coal seam are effectively solved; the dust falling efficiency and the engineering reliability of coal seam water injection are remarkably improved, and meanwhile the synergistic enhancement effect on coal mine rock burst prevention and control is achieved.

This invention discloses a nitrogen-driven pneumatic directional drilling equipment for downhole cuttings removal in soft coal seams, comprising a nitrogen drive mechanism and a directional drilling rig. The directional drilling rig has a directional drill string assembly structure, which includes a drill rod. A probe outer tube is coaxially sleeved inside the drill rod, and a measuring probe is coaxially sleeved inside the probe outer tube. The measuring probe is used to measure the gas flow rate and pressure in the borehole. An annular downward air chamber for nitrogen gas flow is formed between the inner wall of the probe outer tube and the outer wall of the measuring probe. An air inlet is opened on the outer wall of the drill rod at the lower part, and an annular upward air chamber for nitrogen gas flow is formed between the inner wall of the drill rod above the air inlet and the outer wall of the probe outer tube. A trumpet-shaped wind shield, wider at the bottom and narrower at the top, is connected to the outer wall of the drill rod above the air inlet. This invention also discloses a corresponding borehole cuttings removal method. This invention significantly reduces the resistance to airflow, achieving faster drilling speeds and removing more cuttings under the same air volume and pressure.

The invention discloses an earth surface-underground continuous gas extraction method based on a single shaft. The method comprises the steps that an L-shaped horizontal well track is planned based on a coal seam group geology-engineering coupling model; earth surface horizontal well drilling and completion are carried out, and a magnetic positioning short section is preset at a target point; performing multi-stage segmented hydraulic fracturing to construct a fracture network; earth surface drainage and mining pressure reduction is carried out; the underground magnetic steering technology is used for guiding a drill hole to drill through a target spot to achieve physical penetration; installing an underground gas-water separation and control device; and calculating a critical switching threshold value based on a heat-fluid-solid multi-field coupling model, and timely switching from surface drainage to underground negative pressure extraction. According to the method, the wide coverage advantage of surface well drilling and the strong negative pressure advantage of underground extraction are organically combined through the single shaft, the problems that the gas treatment period of the soft coal seam cross-cut coal uncovering area is long, residual gas is difficult to reach the standard, and the underground engineering amount is large are solved, full-life-cycle continuous extraction of gas is achieved, and the gas extraction efficiency is improved. And the parameters are reduced to be below the preset safety threshold value.

The double-wall drilling tool comprises a double-wall water tank, a double-wall drilling rod, a double-wall non-magnetic drilling rod, a double-wall spraying and pumping short section, a pneumatic screw drilling tool and a drilling bit which are connected in sequence, and double channels allowing high-pressure gas, guniting slurry and accumulated water in a hole to pass through are formed. A double-wall drilling tool is adopted, a double-medium flowing channel is formed, wall protection while drilling is achieved in the pneumatic directional drilling process under the condition of the water-containing broken soft coal seam, one part of slurry permeates into micro cracks of the hole wall to play a role in consolidating and reinforcing the hole wall, the other part of slurry can form a wall protection layer with a certain thickness on the periphery of the hole wall of the drill hole, and the effect of protecting the wall is achieved. The effect of supporting the hole wall to be stable is achieved; and the accumulated water in the hole can be reversely pumped and drained by utilizing underground coal mine extraction high negative pressure and through double channels formed by the double-wall drill rod, so that the problem that the hole is difficult to form when meeting water during pneumatic directional drilling is solved.

The invention provides a broken soft coal seam drill-lifting-free directional drilling and punching protection collaborative gas forced pumping machine tool and exploring tube. A high-speed pulse wireless measurement and control while drilling exploring tube is installed in a multi-flow-channel positioning drill rod in a salvageable mode; the high-speed pulse wireless measurement and control while drilling probe tube comprises a transmission seat and a shunting positioning seat, wherein the transmission seat is positioned behind the shunting positioning seat; a flow limiting disc and a flow fixing disc are mounted in the transmission seat; a flow dividing valve and a flow guiding disc are installed in the flow dividing positioning base, and a flow dividing groove is formed in the flow dividing positioning base. The high-speed pulse wireless measurement and control while drilling probe tube has three working states of directional drilling, hydraulic punching and data transmission; the signal transmission rotating motor drives the flow limiting disc to rotate, a high-pressure water flowing channel is changed, and switching of the two working states of directional drilling and data transmission is achieved. The flow channel controls the rotating motor to drive the flow divider valve to rotate, a high-pressure water flowing channel is changed, and switching of the two working states of directional drilling and hydraulic punching is achieved. According to the method, the drilling efficiency, the coverage range and the gas extraction effect of the gas extraction directional drilling of the broken and soft low-permeability coal seam are improved.

The application discloses a self-adaptive hole protection and hole sealing device and method for gas extraction drilling in soft coal seams, the device comprising a sectional screen pipe, an active hole protection assembly and a hole sealing assembly, the active hole protection assembly comprising a multi-section center hollow rod, a cable and a dynamic hole protection support array, the dynamic hole protection support array comprising a supporting unit radially extending and retracting along the multi-section center hollow rod, the supporting unit being used for actively supporting the hole wall and real-time self-adaptive adjustment of the supporting force. The application solves the defects of static passive sealing and separation of hole protection and hole sealing through a dynamic sensing-active regulation-coupled sealing closed loop mechanism. The network distributed electric push rod carries a sensor to real-time monitor the hole wall changes, independently adjust the supporting force and realize real-time dynamic hole protection; the automatic liquid supplementing cavity cooperates with the double back pressure valve to automatically maintain the sealing pressure. The hole protection-hole sealing two-way coupling linkage not only can realize dynamic sensing and real-time self-adaptive adjustment, always maintain the effective sealing of the hole, but also can realize the organic unity of the active hole protection and the hole sealing.

The invention relates to the technical field of coal seam tunneling, in particular to three-soft low-permeability coal seam gas anti-reflection equipment and a using method thereof, and provides the three-soft low-permeability coal seam gas anti-reflection equipment aiming at the problem that existing gas anti-reflection equipment cannot be flexibly adjusted according to the occurrence form, the thickness and the trend of a three-soft coal seam. A U-shaped plate capable of lifting up and down is arranged at the upper end of the moving trolley, a supporting plate capable of overturning up and down is arranged at the upper end of the U-shaped plate, a long rotating shaft capable of rotating is arranged at the upper end of the bottom plate, a drill bit is further arranged at the upper end of the bottom plate, and when the long rotating shaft rotates, the drill bit can move towards one side while rotating; the oscillating mechanism comprises an annular wheel, and when the annular wheel deflects, the long rotating shaft rotates so that the drill bit can oscillate while rotating and moving towards one side; the multi-angle drilling adjustment function can be achieved, the coverage and pertinence of gas anti-reflection are greatly improved, the reciprocating oscillation tunneling stroke can be adjusted according to the coal seam hardness, adaptability is extremely high, and safety is higher.

This invention belongs to the field of coal resource mining, and specifically discloses a method for coordinated support of mining roadways in soft coal seams. This invention utilizes anchor cables, irregular supports, and individual props for coordinated support in mining roadways in soft coal seams. Targeted backing materials are selected to fit the surrounding rock and avoid empty sides and roofs. Precise anchor cable placement ensures strong anchoring force, improving the overall bearing capacity of the roadway and effectively controlling surrounding rock deformation. Material selection and anchor cable placement can be adjusted as needed, reducing construction difficulty and improving efficiency.

The application discloses a kind of soft coal seam area progressive gas extraction method, belong to gas control technical field.The method includes the following main steps: A, first area gas extraction construction:a, construction first stage gas extraction borehole;B, form first stage effective extraction area;C, construction second stage gas extraction borehole;D, form second stage effective extraction area;E, construction third stage gas extraction borehole;F, form third stage effective extraction area;B, other area gas extraction construction: repeat step a to step f in step A, and first stage gas extraction borehole in the latter area is located in the third stage effective extraction area in the former area;C, repeat step B, i.e., gradually complete the gas extraction work of entire coal seam between already excavated roadway and to be excavated roadway.The method can reduce drilling workload, improve hole completion rate, improve gas extraction efficiency and soft coal seam mining safety.

The invention relates to the technical field of tunnel construction, in particular to a medium-air-pressure deslagging construction process under the geological condition of a super-large-burial-depth high-stress soft coal seam, which comprises the following steps: S1, establishing a deslagging system which comprises a medium-air-pressure conveying system and a ground deslagging system, and communicating the ground deslagging system with a coal uncovering hole through a deslagging channel, the slag discharging channel and the axis of the coal uncovering hole intersect at an included angle M, and the included angle M is larger than or equal to 30 degrees and smaller than 90 degrees; s2, drilling construction is conducted; s3, installation of an extraction pipe; and S4, regular extraction is conducted, and the extraction concentration is checked. Gas can be diluted through air pressure, gas concentration is reduced, construction safety is guaranteed, meanwhile, coal cinder is conveyed to a ground slag discharging system by independently building a slag discharging channel intersecting with a coal uncovering hole in an acute angle mode, the coal cinder can smoothly enter the slag discharging channel in the axis direction of a drill hole, the coal cinder conveying distance between a drill rod and the ground slag discharging system is prolonged, and construction efficiency is improved. The situation that coal cinder blocks the orifice and sprays the orifice is avoided, the deslagging efficiency can be improved, and the orifice spraying risk is reduced.

This invention discloses a microscopic method for assessing coal and gas outburst risk based on nanoindentation creep, relating to the field of coal and gas outburst technology. The method includes: sampling and performing gridded nanoindentation testing on target soft coal layers to obtain test data for the soft coal layer samples; analyzing the data obtained through the load-bearing function of a nanoindenter to obtain the creep deformation curve of the coal body; calculating microscopic creep parameters based on the creep deformation curve, and constructing a quantitative relationship between the microscopic creep parameters and macroscopic outburst risk indicators; and making a judgment based on the quantitative relationship between the microscopic creep parameters and macroscopic outburst risk indicators. When the coal seam data meets the preset conditions in the quantitative relationship between the microscopic creep parameters and macroscopic outburst risk indicators, the target coal seam area is judged to have a high outburst risk. This invention enables early prevention and control of mine dynamic disasters and improves the level of safe and efficient coal mine production.

A kind of thick soft coal seam working face roof following excavation along floor mining process method, coal seam thickness and mechanical parameters are obtained by advanced detection technology, and based on coal seam thickness and mechanical parameters, target thick soft coal seam is screened, at the same time, working face size is set, roof following of airway and floor along of working face layer position arrangement mode are determined, and the geometric parameters of layer position transition are calculated;In layer position transition section, gradually down to the floor from the roof layer position of airway along the tendency direction of working face, smoothly transition to the floor layer position of working face;In the airway advanced floor section, gradually down to the floor along the advancing direction of working face, realize the strike smooth connection of airway and working face mining layer position;According to the layer position requirement of roof following excavation and floor mining, fully mechanized caving mining is implemented, and the mining ratio and caving step distance are controlled.The method can realize safe and efficient mining of thick soft coal seam.

The invention discloses a wireless communication fire preventing and extinguishing monitoring system for broken and soft coal seam drilling, and belongs to the technical field of drilling fire preventing and extinguishing. The monitoring system takes an oxidation range dynamic analysis module as a core, and combines a coal seam type judgment module, a wireless communication module, a multi-dimensional data acquisition module, an automatic control module and a ground management and control platform; the method comprises the following steps: by collecting four groups of characteristic parameters, namely CO concentration gradient, temperature field distribution, gas negative pressure fluctuation and coal body micro-displacement in a coal body oxidation process, constructing a three-dimensional oxidation range prediction model coupled with oxidation dynamics and finite element analysis, and tracking the diffusion trend of an oxidation fire source point in real time; meanwhile, parameter transmission and flexible arrangement are achieved through wireless communication, and the hidden danger of the non-spontaneous combustion coal seam is judged in combination with composite parameters. Accurate and dynamic monitoring of the oxidation range of the spontaneous combustion coal seam is achieved, the risk is early warned in advance, and the fire prevention and extinguishing safety and the intelligent level of broken and soft coal seam drilling construction are remarkably improved.

The utility model provides a three-soft coal seam gob-side tunneling collaborative supporting device, and relates to the field of supporting devices, the three-soft coal seam gob-side tunneling collaborative supporting device comprises a plurality of supporting assemblies, the supporting assemblies are sequentially connected, each supporting assembly comprises a base, a telescopic rod, a supporting frame and a telescopic support, the telescopic support is provided with a plurality of cross beams, one end of the telescopic rod is provided with a first plug pin, and the other end of the telescopic rod is provided with a second plug pin; when the coal seam supporting device is used, the coal seam supporting device is moved to the side portion of a coal seam, the supporting frame and the telescopic support are made to be close to the coal seam, then the base is fixed through the second plug pins, the height of the telescopic support is adjusted, and the coal seam supporting device is used for supporting the coal seam. The height of the telescopic rod can be adjusted according to the height of a coal seam and the strength of the coal seam, and the telescopic rod is convenient to mount, dismount and use.

The invention belongs to the technical field of mine disaster detection robots, and particularly relates to an advancing device suitable for the terrain after a coal mine disaster, a mine disaster detection robot and a method. The traveling device of the present invention comprises: a traveling bracket; four groups of crawler belt mechanisms; a cross beam frame; a travel motor; an output turbine shaft; the left crawler mechanism and the right crawler mechanism are in transmission connection with the upper crawler mechanism through a third reversing gear set; one advancing motor rotates to drive the four sets of crawler belt mechanisms to synchronously advance or retreat through linkage of the output turbine shaft, the first reversing gear set, the second reversing gear set and the third reversing gear set. According to the invention, machine body distortion or lateral deviation caused by inconsistent crawler belt speed is avoided, and any crawler belt in contact with the ground can actively output power even if the robot rolls over and rolls on one side, so that the problem that a traditional robot slips and sinks on soft coal cinder or wet and slippery road surfaces due to suspension of driving wheels is thoroughly solved.

The invention discloses an underground pneumatic directional drilling device for a soft coal seam, and relates to the field of directional drilling of the soft coal seam, and the underground pneumatic directional drilling device comprises an air compressor arranged on the surface of a bottom layer needing to be drilled; the drill rod is connected to the output end of the air compressor; the drilling tool is rotationally arranged at the bottom of the drilling rod; the foam filtering assembly is arranged on the ground surface of the drill hole and annularly sleeves the outer wall of the drill rod; the device can adaptively adjust the working state according to the amplitude difference of the drilling tool in different coal seams, and the drilling stability is improved.

A method for analyzing the gas concentration in a goaf of a steeply inclined soft coal seam having a high mining height, relating to the field of coal mine exploitation. The method comprises: determining the distribution of fractures in surrounding rock of a stope during mining of a steeply inclined soft coal seam having a high mining height, and determining a source of gas and influencing factors of gas emission in a goaf of the steeply inclined soft coal seam having a high mining height; on the basis of the distribution of fractures in the surrounding rock of the stope, the source of gas, and the influencing factors of gas emission, configuring a plurality of monitoring levels within a gas monitoring area, and dividing each monitoring level into a plurality of monitoring cross-sections; dividing meridians and parallels within each monitoring cross-section, and using intersections of the meridians and parallels as gas monitoring points; acquiring gas concentration data at each gas monitoring point, and acquiring coal seam inclination angle information; drawing a gas concentration contour map on the basis of the coal seam inclination angle information and the gas concentration data of all gas monitoring points; and, on the basis of the gas concentration contour map, determining a gas concentration distribution in the goaf of the steeply inclined soft coal seam having a high mining height, thereby improving the accuracy of gas concentration analysis.

The present application relates to a kind of soft coal seam gas extraction borehole repair method based on pressure transmission impact energy, belong to coal mine safety field, solve the problem that the effect of gas extraction is influenced by the plugging of borehole caused by conventional collapse in the process of gas extraction in soft low permeability coal seam;Through the connection of underground mine pressure wind source and pressure booster, so that the impact inclined block is in contact with the trigger latch, the bottom of the trigger latch is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact spring, and the impact spring is contacted with the impact

The application discloses a kind of soft coal seam drilling with bionic self-drilling robot system, including hole outside assembly and hole robot body;Hole outside assembly includes hole outside assembly support, also includes high-pressure air pump, hole protection foaming A liquid delivery pump, hole protection foaming B liquid delivery pump, coil pipe device, flexible transmission pipe, explosion-proof computer, power controller and gas control valve fixed on hole outside assembly support;Hole robot body includes connection joint, measurement short section while drilling, drilling support mechanism, gas driving force mechanism, wheel groove rotating mechanism, rotating switching mechanism, hole foaming mechanism, angle-adjusting bent shell and cone drill bit connected in sequence.The application adopts wind pressure to drive hole drill bit to advance, retreat, and through the uniform rotation and locking of control drill bit tool face angle, respectively realizes straight drilling and directional build-up angle drilling, realizes long distance directional drilling in soft coal formation.

The invention belongs to the field of coal seam gas extraction, and discloses a soft coal seam gas extraction method and equipment based on CO2 fracturing permeability increase and nanofluid synergy, and during soft coal seam gas extraction, uniform fracturing is difficult to realize in traditional fracturing, or local fracturing is insufficient, or coal is excessively crushed, the coal seam fracture connectivity rate is low, and gas flow is influenced. The method comprises the steps that liquid CO2 phase change fracturing holes and gas extraction holes are formed according to the interval of 3-5 m in a grid mode, after supercritical CO2 (the temperature is increased to 31.1 DEG C or above or the pressure is larger than or equal to 7.38 MPa) fracturing and permeation increasing are conducted, nanofluid (the permeation speed is increased by 30%-50% compared with clear water) is injected, the hole sealing length is larger than or equal to 5 m (the gas leakage rate is smaller than or equal to 0.5% / d), and then extraction equipment is connected; the equipment comprises a deslagging tank, a swingable blowpipe and an automatic deslagging mechanism. The coal seam fracture connectivity rate can be increased, the gas displacement efficiency is improved by 25%-35%, the fracture stabilization time is prolonged, the coal collapse risk is reduced, the separation rate of the equipment for coarse coal powder with the particle size larger than or equal to 0.1 mm reaches 92% or above, and the device is suitable for safe and efficient gas extraction of soft coal seams.

The application provides a soft coal seam hole collapse early warning method and device, electronic equipment and storage medium, and belongs to the technical field of mine monitoring. The method comprises the following steps: acquiring standardized time sequence data of a drill bit in a drilling process in a current period; performing space-time alignment and feature enhancement processing on the standardized time sequence data of the drill bit in the drilling process in the current period to obtain feature enhancement data; extracting space-time correlation features of different monitoring dimensions in the feature enhancement data through a space-time attention convolution network to generate a multi-field coupling feature tensor; inputting the multi-field coupling feature tensor into a double-branch adversarial time sequence prediction model to obtain a hole collapse risk precursor feature set in a future period; generating a hole collapse early warning level based on the hole collapse risk precursor feature set in the future period; and performing risk early warning on a hole collapse of a soft coal seam based on the hole collapse early warning level. The application can improve the accuracy of mine risk early warning and ensure the safety of mine operation.

The invention discloses a coal mine underground soft coal seam directional drilling device, and relates to the technical field of coal mine equipment. The drilling connecting device is fixed at the front end of the drilling rod; the drill bit is fixed at the front end of the drilling connecting device; the protective sleeve is arranged between the drill rod and the wall of the drill hole, and the outer wall of the protective sleeve is attached to the inner wall of the drill hole; the conveying assembly is arranged between the drill rod and the protective sleeve, and the outer wall of the conveying assembly is attached to the inner wall of the protective sleeve; the clamping and positioning device is arranged on the outer wall of the drill rod and located at the rear end of the protective sleeve, the drill rod is rotationally connected with the clamping and positioning device, and the clamping and positioning device is fixed through external equipment. A drilling-chip removal-supporting integrated system is formed, the multiple technical effects of efficient drilling, stable orientation, hole collapse prevention, drill rod deformation prevention and rapid depth adaptation are achieved in the soft coal seam, and the operation safety and the drilling efficiency are remarkably improved.

The invention relates to the technical field of roadway drilling safety, and discloses a soft coal seam underground drilling dust-falling blowout preventer which comprises a drill rod and an auxiliary assembly used in cooperation with the drill rod, the auxiliary assembly comprises a fixing flange, and the fixing flange is fixedly installed on a roadway wall near a drill hole; an adjusting assembly is fixedly installed on the fixed flange and comprises a fixed plate and a movable plate, the fixed plate is fixedly installed on the side, away from the sliding bin, of the fixed flange, a sealing bag is fixedly installed between the fixed plate and the movable plate, a plurality of fixing holes are formed in the fixed plate, and the movable plate is fixedly installed on the fixed plate. And a plurality of insertion rods are fixedly mounted on the movable plate. The movable plate is matched with the sealing bag. When shrinkage or collapse occurs in the drilled hole, the movable plate is matched with the sealing bag, so that the sealing bag moves and is arranged on the outer side of the movable plate in a sleeving mode, and the effects of improving the sealing performance and reducing gas and coal leakage are achieved.