24 results about "Hard coal" patented technology

The present application belongs to the field of coal mine drilling, and particularly relates to a reamer for directional long drilling of coal seams; the reamer comprises a reamer barrel, a strip-shaped groove is uniformly formed on the inner wall of the reamer barrel along the circumferential direction, a cutter seat is slidably arranged in the strip-shaped groove, and a cutter wing is mounted on the cutter seat; a top plate penetrating through the cutter seat is further hingedly arranged on the cutter seat, a driving part for driving all the cutter seats to synchronously slide up and down in the strip-shaped groove is further arranged in the reamer barrel, and the cutter wing is used for adjusting the position of the cutter wing protruding from the outer wall of the reamer barrel and further adjusting the cutting diameter during the up-and-down sliding of the cutter seat in the strip-shaped groove; the driving part further cooperates with the top plate to drive the top plate to swing and remove the coal ash in the gap of the cutter wing; the present application reduces the abrasion from layered cutting, cooperates with self-cleaning and heat dissipation to maintain the cutting efficiency, dynamically adjusts the hole diameter and real-time performs the hole wall trimming during the reaming process, and forms a functional closed loop from the local to the whole to jointly solve the problems of tool life, chip removal and hole forming accuracy in the reaming of hard coal seams.

The invention discloses an active crushing control method of a hydraulic cutter type top coal caving support, and belongs to the technical field of coal mine intelligent control. The method comprises five steps of frame moving and locking, parameter setting, active crushing, pressure maintaining and expanding and retracting and resetting, crushing parameters can be adjusted in a self-adaptive mode, an extension structure is compatible, and dual-mode control and platform butt joint are supported. The method solves the problems of poor crushing and low recovery rate of traditional passive top coal caving, is suitable for various hard coal working faces, and can be used for transforming new supports and old supports.

The invention discloses a mining device and a mining method suitable for a hard ore body, and belongs to the technical field of hard coal mining. The device comprises an unmanned mining car, an adjusting mechanical arm is installed on the unmanned mining car, a rotary rock breaking machine is detachably connected to the adjusting mechanical arm, and an ore shoveling bucket is installed on a car head of the unmanned mining car; a buffer assembly is installed at the joint of the adjusting mechanical arm and the rotary rock breaking machine, when the rotary rock breaking machine makes contact with ore for operation, the rotary rock breaking machine moves through a sliding rod and compresses a buffer spring, and then vibration force of the rotary rock breaking machine during ore excavation can be buffered; the vibration force transmitted to the adjusting mechanical arm or the unmanned mining vehicle is reduced, and when the rotary rock breaking machine makes contact with harder rock, the rotary rock breaking machine can be protected, and the service life of the rotary rock breaking machine is prolonged.

The invention discloses an intelligent cooperative system and method for graded utilization of multi-concentration gas in a deep coal mine. A high-concentration gas extraction unit conveys gas with the concentration exceeding 30% to the ground; the low-concentration gas movable in-situ utilization unit has three functions, gas with the concentration lower than 8% at different positions is collected and purified to serve as power fuel for underground movement of the gas, the surplus high-concentration gas after movement and energy consumption is merged into the high-concentration gas extraction unit, and the gas utilization rate is increased; meanwhile, in the moving process, an environment monitoring module carried by the device can carry out environment monitoring on different underground positions; according to the medium-concentration gas controllable combustion rock breaking unit, medium-concentration gas with the concentration ranging from 8% to 30% can be subjected to impact rock breaking through a water open fire restraining double-layer cavity combustion and explosion structure, and the purpose that existing rock breaking machinery is assisted in breaking hard rock (hard coal) is achieved. Under the regulation and control of a control center, the system formed by the equipment is mutually coordinated and matched, and the coal mine gas can be classified, divided into sources and accurately utilized underground.

The application discloses a coal mine roadway coal seam tunneling pressure relief device and method, and relates to the field of coal mine roadway coal seam tunneling pressure relief devices and methods. The pressure relief device comprises a caterpillar tractor and a drill rod. The drill rod comprises a drill rod body, a first oil cavity extending along the length direction of the drill rod body, and a second oil cavity extending along the radial direction of the drill rod body and being in communication with the first oil cavity. A piston rod is adapted in the second oil cavity, and the piston rod can switch between an extended position outside the second oil cavity and a retracted position inside the second oil cavity. A first grouting pipe is arranged along the extension direction of the first oil cavity, and a second grouting pipe is arranged along the extension direction of the second oil cavity and is in communication with the first grouting pipe. The second grouting pipe is sequentially provided in the second oil cavity and the piston rod. When hydraulic fracturing is needed for the drill hole drilled by the drill rod body, the piston rod is switched from the retracted position to the extended position to form a fracture hole. When pressure relief is needed for hard coal bodies, silent expansion liquid is injected into the fracture hole through the first grouting pipe and the second grouting pipe.

The invention relates to the production of low-CO2 wood pellets with high energy density by adding coal dust, such as wood, hard coal or lignite dust, during the production process.

The invention discloses a super-large mining height extra-thick hard coal top coal caving mining ratio determination method, which comprises the following steps: S1, carrying out stability analysis on a coal wall of a working surface, and determining a first mechanical mining height range H1 of a coal mining machine according to a strain range of the coal wall; s2, constructing a top coal body cantilever mechanical model, deducing to obtain a relational expression between the top coal thickness and the limit suspended top length, and determining a second machine mining height range H2 of the coal mining machine in combination with the coal caving step pitch parameter; and S3, comparing the first mechanical mining height range H1 with the second mechanical mining height range H2, if an overlapping area exists between the first mechanical mining height range H1 and the second mechanical mining height range H2, selecting the maximum value in the overlapping area as the mechanical mining height of the coal mining machine, and if the overlapping area does not exist between the first mechanical mining height range H1 and the second mechanical mining height range H2, selecting the maximum value in the first mechanical mining height range H1 as the mechanical mining height of the coal mining machine. The method for determining the top coal caving ratio of the extra-large mining height extra-thick hard coal has the advantages of being simple in step, high in safety performance and the like.

The present application relates to the technical field of coal seam mining, in particular to a coal pillar-free mining method suitable for thick and hard coal seam fully-mechanized caving face, comprising: first reinforcing the upper section track roadway; constructing a top breaking hole and a directional long borehole in the upper section track roadway; performing hydraulic fracturing through the directional long borehole; performing blasting top breaking through the top breaking hole; performing mining on the upper section working face and second reinforcing the upper section track roadway. The present application cuts off the stress transmission path of the goaf and the roadway roof rock stratum by directional blasting top breaking, improves the stress environment of the end of the working face surrounding rock; the thick and hard top coal is weakened by directional borehole hydraulic fracturing technology, which improves the top coal caving property and the coal recovery rate of the working face; in addition, the directional blasting top breaking and directional borehole hydraulic fracturing are performed before the mining of the working face, which does not increase the construction process during the mining of the working face.

The utility model discloses coal seam directional fracturing gas extraction equipment, which relates to the field of coal mine gas anti-reflection extraction and comprises a fracturing extraction pipe, and a fracturing extraction cavity and a sealing element are fixed on the fracturing extraction pipe. When the method is used for fracturing the coal seam, if the coal seam cannot be fractured only by means of the fracturing fluid, the fracturing extraction cavity can control the fracturing fluid to violently impact the hard coal seam to force the coal seam to be fractured, so that the overall fracturing effect of the coal seam is improved, and then efficient extraction of coal seam gas is improved.

This invention discloses a method for evaluating the operational status of a mining drilling rig system based on an echo-state Bayesian neural network. This method addresses the challenges of dynamic feature extraction, model overfitting, and the lack of uncertainty quantification in deterministic assessments of drilling rig status under conditions of strong vibration and high noise in underground environments. It employs an echo-state network with a leakage integral mechanism to suppress noise and extract slowly varying dynamic features from multi-source sensor time-series data, constructing a high-dimensional feature vector through dual-view feature aggregation. A Bayesian neural network with Concrete Dropout is introduced to achieve state probability mapping based on variational inference, and Monte Carlo sampling and prediction entropy are combined to quantify cognitive uncertainty and provide early warning of high-entropy anomalies. This invention effectively filters out high-frequency noise, suppresses overfitting in small samples, and enables proactive early warning of abnormal operating conditions. It achieves high classification accuracy on hard coal seam drilling datasets, and its assessment accuracy and decision reliability are significantly superior to traditional deep learning models.

The invention relates to the technical field of raw coal conveying of thermal power plants, in particular to a feeding and conveying device of a coal feeder of a thermal power plant, and adopts the technical scheme that the feeding and conveying device comprises a machine shell, a feeding cylinder is fixedly connected to the top end of the machine shell, and a coal outlet is fixedly connected to the bottom of one side of the machine shell. Raw coal in the coal bunker can be controlled to fall down through the feeding cylinder, after the raw coal falls onto the conveying belt, the raw coal can be conveyed to one side through the conveying belt, by arranging the flattening assembly, the raw coal can be evenly spread on the conveying belt, and when caked coal blocks are encountered, the large coal blocks can be crushed through the crushing assembly, so that the coal blocks are crushed, and the coal blocks are conveyed to one side through the conveying belt. And when the raw coal passes through the flattening assembly, the crushing assembly can generate vibration to promote the hard coal briquettes to be crushed when the raw coal meets the hard coal briquettes, the weighed raw coal can be conveyed into and out of the coal inlet through the conveying belt and enters the coal mill through the coal outlet, and the problem that the caked coal briquettes are prone to being stacked on the conveying device is solved.

The application discloses an integrated device suitable for coring and coal removing in hard coal seam and a use method thereof, and comprises a coal removing power unit (34), a coring unit (35), a supporting unit (39) and a buffer collecting unit (40). The power output end of the coal removing power unit (34) is connected with one port of the coring unit (35), the coring unit (35) is arranged on the supporting unit (39), and the other port of the coring unit (35) is connected with the buffer collecting unit (40). The application is specially suitable for coring sampling and coal removing operation in hard coal seam. The integrated device can realize labor-saving, rapid and successful removal of coal samples in a coring cylinder, does not need to use electricity, has high safety in underground operation, and can improve the correctness of gas content testing and the coring efficiency.

The invention discloses an intelligent proportioning grinding pretreatment method and device which are used for solving the problem of over-grinding or under-grinding of a coal mill caused by coal quality fluctuation in the process of blending combustion of low-calorific-value coal and conventional coal in a coal-fired power plant. The system is composed of three core modules: a multi-modal online coal quality analysis module is fused with near infrared spectrum, a piezoelectric hardness sensor and machine vision, and coal quality characteristics are identified with high precision through a CNN-Transform model; the double-cavity type graded crushing module is used for respectively carrying out differentiated crushing on the soft coal and the hard coal, and ensuring that the discharging granularity is stabilized at 10-30mm; the separated raw coal bunker and the proportion control module are of a four-bunker structure, the coal feeding proportion is dynamically adjusted in combination with a random forest algorithm, and the proportion precision of + / -2% is achieved. All the modules are linked through a Siemens S7-1500 PLC central control system, a'sensing-decision-execution-feedback 'closed loop is constructed, and the granularity deviation of coal to be ground is smaller than or equal to 5%.

The application discloses a thin coal seam cutting device, a coal mining machine and a coal mining system. The thin coal seam cutting device comprises a drum and a plurality of first cutting teeth. The plurality of first cutting teeth are arranged on the end face of the first end of the drum at intervals. Compared with the first cutting teeth far away from the central axis of the drum, the tooth tip of the first cutting tooth close to the central axis of the drum is farther away from the end face of the first end of the drum. The tooth tips of the plurality of first cutting teeth are located on a first arc surface, and the first arc surface is an arc surface protruding in the direction away from the end face of the first end of the drum. Compared with the end part of the feed cutting device in the related art which is generally a plane structure, the thin coal seam cutting device provided by the embodiment of the application can more efficiently destroy the coal wall and cut the coal wall when feeding, greatly improving the coal mining speed and the coal mining efficiency. Moreover, the thin coal seam cutting device provided by the embodiment of the application has strong cutting strength and is suitable for cutting of hard coal rock.

This invention relates to the field of coal mining technology and discloses a high-pressure rotary jetting method for depressurizing thick, hard coal seams with topsoil. The method includes: quantitatively screening key layers using stiffness weighting and strength dual-control indicators; establishing a constraint relationship between the jet cutting radius and the top thickness, and planning a multi-level, layered, and vertically staggered borehole layout; treating the top as a fixed-support beam structure and calculating the ultimate span to determine the axial spacing of the cutting grooves; based on the principle of energy consumption per unit volume of crushing, back-calculating the dynamic parameters for matching the target cutting depth; using the fluid reaction torque generated by the eccentric nozzle to drive the tool, and achieving adaptive and stable speed control through a viscous damping mechanism. This invention, through scientific quantitative design and downhole self-balancing control, achieves precise full-thickness coverage of extremely thick, hard topsoil, eliminates depressurization blind spots, ensures cutting depth and rock-breaking efficiency under deep hard rock conditions, and effectively cuts off the stress transmission path of the suspended roof in the goaf.

The invention relates to the technical field of safe and efficient mining of coal mines, and discloses a static fracturing and hydraulic fracturing synergy-based hard coal weakening method, which comprises the following steps of: determining a drill hole arrangement mode and a quantity ratio; drilling holes are constructed according to a preset interval meeting the physical penetration requirement, and track control is carried out; the constructed packaging type static expansion device is arranged in the static fracturing drill hole and sealed; water is injected into the hydraulic fracturing drill hole to generate a water guide crack, and communication characteristics are monitored; after confirmation of cut-through, an expansion device is activated through crack water flow, and generated radial expansion stress and a hydraulic fracturing stress field are superposed to form a synergistic weakening effect; and determining coal body parameters to evaluate the weakening degree. The static fracturing units are communicated and activated through the hydraulic fractures, the fractures are supported through static stress to prevent closing, meanwhile, composite stress is overlaid at the tip ends of the fractures to induce secondary fractures, the problems that single hydraulic fracturing fractures are prone to closing, and static fracturing deep crack initiation is difficult are solved, and efficient volume breaking of hard coal is achieved.

The invention relates to the technical field of mining and discloses a hard coal seam cracking tool and method.The hard coal seam cracking tool comprises a cracking assembly, the cracking assembly comprises a first barrel, a second barrel, an overload component and a plugging component, a through hole is formed in the side wall of the first barrel, the second barrel is arranged in the first barrel, and the overload component is arranged in the second barrel; the second barrel can move along the first barrel and has an initial position and a working position, the second barrel blocks the through hole when located at the initial position, the second barrel opens the through hole when located at the working position, and the overload component is arranged between the first barrel and the second barrel and has overload force for preventing the second barrel from being separated from the initial position. The plugging part is used for plugging one end of the second barrel, and when the first barrel is filled with a medium, the medium can push the second barrel to overcome the overload force so as to open the through hole and enable the medium to flow out of the through hole; according to the gas-liquid mixed fracturing device, gas-liquid mixed fracturing with large displacement, large liquid amount and timely temporary plugging can be achieved, sectional fracturing can be achieved, and the fracturing effect is remarkable.

The invention discloses a control method of an annular feeder, and particularly relates to the field of automatic control of feeders, and the method comprises the steps: setting three control modes of maintenance, local and remote, enabling the maintenance mode to support independent start and stop of a plough coal layer and a discharge layer, collecting the real-time current of a plough coal motor through a built-in unit of a frequency converter, distinguishing a plurality of motion states, and precisely converting the plough coal resistance, the output power of the motor is dynamically adjusted based on a preset resistance threshold value, power is reduced and energy is saved during low resistance, power is gradually increased during high resistance, and when hard coal briquettes exist in the coal seam or the density of the whole coal seam is high, the adjusting module is driven to switch the coal ploughing state, and the problem of high-density accumulation of the hard coal briquettes and the coal seam is solved. Motor overload caused by hard coal briquettes and overhigh coal seam density is avoided, and continuous and stable operation of the coal conveying line is guaranteed.

The application discloses an intelligent collaborative system and method for multi-concentration gas grading utilization in a deep coal mine, wherein a high-concentration gas extraction unit is used for conveying gas with a concentration higher than 30% to the ground; a low-concentration gas mobile in-situ utilization unit is used for collecting and purifying gas with a concentration lower than 8% at different positions to serve as power fuel for its underground movement, and surplus high-concentration gas after the movement is integrated into the high-concentration gas extraction unit to improve the gas utilization rate; meanwhile, an environmental monitoring module carried by the low-concentration gas mobile in-situ utilization unit can perform environmental monitoring on different positions in the underground; a medium-concentration gas controllable combustion and explosion rock breaking unit is used for impacting and breaking rocks by combusting and exploding medium-concentration gas with a concentration between 8% and 30% through a water fire suppression double-cavity combustion and explosion structure, so that the existing rock breaking machine is assisted to break hard rocks (hard coal). Under the regulation and control of a control center, the system composed of the above equipment is cooperatively matched with each other, and can realize grading, source separation and precise utilization of coal mine gas in the underground.

This utility model discloses an impact monitoring system for a hard coal seam roof under intense mining pressure working face, including an underground working face coal seam and an upper roof. Multiple coal seam stress sensors are installed within the working face coal seam, and multiple roof stress sensors are installed inside the roof and at the interface with the working face coal seam. The roof stress sensors and coal seam stress sensors are electrically connected to a mine data transmission station, which is electrically connected to a monitoring server above ground. This hard coal seam roof under intense mining pressure working face impact monitoring system, by installing multiple stress sensors at the interface between the coal seam and the roof, forms a monitoring unit without blind spots, enabling comprehensive monitoring of the stress distribution characteristics under intense roof pressure, thus improving monitoring accuracy.

The invention relates to the technical field of coal mining equipment, and discloses a hydraulic cutter type directional crushing top coal caving hydraulic support which is suitable for mining medium-hard coal, hard coal and extra-hard coal thick coal seams with uniaxial compressive strength of 5-30 MPa and undeveloped joint fissures. An active pressurization type hydraulic cutter mechanism is additionally arranged on a fixed bearing section on the rear portion of a base of a hydraulic support body, and a guide opening accurately matched with a cutter body is formed in the tail end of a top beam and matched with a double-side spring elastic closing mechanism. The mechanism is provided with an independent hydraulic control branch, active pressurization and directional crushing of top coal are achieved, and the passive crushing bottleneck is broken through. The triangular tool bit cutter body is driven by the 500-3000kN adjustable thrust stand column to vertically cut coal, the coal body is guided to directionally collapse towards a goaf, an existing support can be transformed in batches (the transformation cost is 15%-20% of that of a new support), the coal caving recovery rate is increased by about 10%, the problems of insufficient hard coal crushing and irregular coal body collapse are solved, and the coal caving device has operation safety, working condition adaptability and industrialization prospects.

The invention relates to the technical field of coal mine safety, in particular to an air blasting and directional fracturing control method and system for the end of a fully mechanized coal mining face of a hard coal rock layer. The method comprises the steps that S1, air blasting holes and directional fracturing holes are formed in a staggered mode, and the bottoms of the air blasting holes and the directional fracturing holes are intersected in an end suspension top core weakening area; s2, high-pressure air is injected into the air blasting holes, sodium thiosulfate solid particles are carried in the high-pressure air, net-shaped presplit cracks are formed in the top coal through blasting, the sodium thiosulfate solid particles expand rapidly in the blasting process and are sprayed to the terminals of the presplit cracks, the cracks are elastically supported, and meanwhile the air permeability is achieved; s3, fracturing fluid is injected into the directional fracturing hole, the fracturing fluid is guided by means of a guiding slotting device, and a penetrative cut-off crack is formed; and S4, monitoring the top plate subsidence and the coal stress value in the end area, and dynamically adjusting the system parameters according to the monitoring data. Through cooperation of air blasting and liquid fracturing, filling of the proppant is synchronously completed while blasting is conducted, and the filling lag phenomenon is eliminated.

The invention provides a double-motor parallel wire passing arrangement method for a cutting part of a coal mining machine. The double-motor parallel wire passing arrangement method comprises the following steps: connecting two motors in a roller of the coal mining machine in parallel; a first cable wiring channel is designed, and the wiring channel surrounds the outer edge of the motor on one side of the end cover and is communicated with a binding post of the motor on the other side; a screw space is reserved when the rear end cover is mounted on each motor, and the screw spaces of the two motors are partial wiring channels; the motor cable is connected with the motor on one side through the second cable wiring channel, and the cable of the motor on the other side is connected with the motor on the other side through the first cable wiring channel. In order to meet the mining requirements of ultra-thin and medium-thickness coal seams, an explosion-proof motor used by a cutting part of the coal mining machine adopts a double-motor transverse arrangement mode. The capacity of cutting hard coal and dirt band can be enhanced through double-motor parallel driving, and the device is particularly suitable for medium-thickness coal seams and gangue-containing geology.