42 results about "Hard coal" patented technology

The invention relates to the technical field of coal deep processing equipment, and particularly discloses a coal preparation device which comprises coal receiving equipment, pre-crushing equipment, a coal distributing mechanism, a coal blending bin, coal blending crushing equipment and a coal tower which are sequentially arranged along a production process, and materials are conveyed among the equipment through belt conveyors; the coal receiving equipment comprises a coal receiving pit and a coal feeder arranged below the coal receiving pit; the coal distributing mechanism comprises a first coal distributing mechanism which is arranged in front of the pre-crushing equipment and is used for conveying coal types which do not need to be pre-crushed to the coal blending bin; the second coal distributing mechanism is arranged behind the pre-crushing equipment and is used for conveying the pre-crushed coal types to the coal blending bin; the plurality of coal blending bunkers are used for respectively storing different coal types, and electronic automatic batching scales are arranged below the coal blending bunkers; and iron removers are arranged between the coal receiving equipment and the pre-crushing equipment as well as between the coal blending bunker and the coal blending crushing equipment. The invention aims to solve the problems that coal with high hardness cannot be finely crushed and coal easy to crush is excessively crushed due to a process with coal blending equipment.

The invention provides a regional top coal caving dynamic control method and device for extra-thick hard coal. The method comprises the following steps: collecting top coal transportation state data; performing multi-source data processing by adopting a data-level, feature-level and decision-level fusion algorithm, and generating a top coal crushing degree evaluation result, a falling state recognition result and a top plate stability analysis result; performing multi-model collaborative reasoning by utilizing a D-S evidence theory, fuzzy logic and a Bayesian network according to a top coal crushing degree evaluation result, a falling state recognition result and a top plate stability analysis result, and generating opening and closing time prediction and control instructions of a coal discharge port of each region; and the control instruction is issued to a hydraulic support through an electro-hydraulic control system, differentiated opening and closing control over the regional coal caving openings is achieved, and a control strategy is dynamically adjusted according to real-time feedback data. According to the method, regional dynamic accurate control over the top coal caving process of the extra-thick hard coal seam is achieved, the top coal recovery rate is remarkably increased, the gangue mixing rate and the support instability risk are reduced, and the mining efficiency and safety are improved.

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 present invention relates to the technical field of coal mine equipment, and specifically to a roof stability monitoring and control and coal wall weakening method based on a hydraulic support. By constructing a roof stability monitoring and early warning model, the working face roof condition is monitored by a hydraulic support, and the hydraulic support is dynamically adjusted based on roof feature recognition and dynamic zoning to improve the crushing effect of thick hard coal seams, predict the roof condition in the working face advancement direction, change the hydraulic support pressure regulation strategy in real time, and eliminate the lag in the adjustment and adaptation of the existing pressure regulation strategy.

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 hard coal seam acoustic wave penetration method, comprising the following steps: sampling coal blocks of a hard coal seam to be penetrated, and obtaining tensile strength and shear strength of the coal blocks; drilling a working borehole in the hard coal seam, and impacting the working borehole at a set working strength, so that the strength of an impact wave generated by the impacting is lower than the strength at which the impact wave generates a crushing zone in the hard coal seam; the impact wave generated by the impacting cracks the hard coal seam around the working borehole, the impact wave attenuates after cracking the hard coal seam, and forms an acoustic wave, and the acoustic wave penetrates the hard coal seam. The application solves the problem that an effective high-strength sound source capable of being loaded to a coal seam is difficult to develop in the prior art. The application cracks the coal seam around the borehole by impacting, and the acoustic wave attenuated by the impact force excites the coal seam. The application can obtain a high-strength acoustic wave directly loaded to the hard coal seam. The application can promote gas desorption, and meets the demand of gas treatment.

The invention discloses a coal mine roof blasting scheme determining method and device, equipment, a medium and a product, and relates to the technical field of coal mine thick and hard roof blasting pressure relief. According to the engineering geological conditions, a blasting scheme determination expert system is adopted, and a coal mine roof blasting scheme of the target blasting area is obtained; a knowledge base of the blasting scheme determination expert system comprises a typical case database and a blasting rule knowledge base. The expert system is applied to determination of the coal mine roof blasting scheme, the expert system knowledge base is constructed according to the typical case database and the blasting rule knowledge base, and a basis is provided for intelligent optimization of the coal mine roof blasting scheme.

The application provides a phase-change detonation directional metal jetting permeability enhancement process method, which is suitable for coal seam roof and floor rock mass and medium-hard coal body. Single or multiple phase-change detonation metal jetting equipment is installed on a drill rod and pushed into a target area, and the target area is subjected to directional pressure relief and permeability enhancement by using the phase-change detonation metal jetting equipment. The phase-change detonation metal jetting equipment comprises a pressure-bearing packer, a perforator and a gas tank, the gas tank is filled with liquid carbon dioxide, and a phase-change exciter and a phase-change instantaneous delay exciter are arranged on the gas tank. The liquid carbon dioxide is excited to change into a gaseous state, high-pressure detonation energy is generated, a bullet head is directed to jet into the target area, and a permeability enhancement hole is formed. Single or multiple continuous composite permeability enhancement can be realized, and the permeability of the coal seam is improved. The phase-change detonation directional metal jetting equipment has a reasonable structure, is easy to operate, has a wide application range, and can effectively improve the gas extraction rate and the mining safety. The application has the advantages of high efficiency, safety and controllability, overcomes the limitations of traditional permeability enhancement methods, has a remarkable permeability enhancement effect, and has a wide application prospect.

The present invention discloses a combined storage and improvement method of sand-carrying oxidant pulse injection-static fracturing for hard coal seams. The method comprises the following steps: first, a sand-carrying oxidant liquid is pulsed injected into the coal seam, and the oxidant liquid impacts the coal body under the water wedge degradation effect of the pulse wave. Simultaneously, the oxidant liquid contacts the coal body during the impact process to carry out an oxidation reaction, so that the coal body forms a fracturing weak surface and generates microcracks. Then, small quartz sand particles and the oxidant liquid are squeezed into the microcracks to expand and extend the microcracks, while increasing the contact area between the oxidant liquid and the coal body, thereby enhancing the oxidation effect and providing more fracturing weak surfaces for subsequent static fracturing. Subsequently, the sand-carrying fracturing fluid is injected into the coal seam for static fracturing, so that the microcracks in the fracturing weak surface converge, develop and expand longitudinally, and large quartz sand particles are squeezed into the expanded cracks to further expand and extend the hole. By alternately performing the oxidant pulse injection and static fracturing processes, a complex fracture network is continuously formed inside the coal seam, and finally in-situ oxidation-static fracturing progressive permeability enhancement of the coal seam is completed.

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.

This invention discloses a hammer-type coal cutter, comprising a trolley, a motor, and a cutting drum. The trolley includes a frame, handles, and wheels, with the handles and wheels connected to the frame. The motor is mounted on the frame. The cutting drum includes a drum shaft and several hammers. The drum shaft is rotatably mounted on the frame and extends horizontally. One end of each hammer is movably connected to the drum shaft. The motor drives the drum shaft to rotate. The hammer-type coal cutter disclosed in this invention has high coal cutting efficiency. Through the high-speed rotation of the cutting drum, the hammers repeatedly strike the coal at the bottom of the drum, peeling away the hard coal layer by layer, saving manpower. Furthermore, the hammer-type coal cutter has a simple and compact structure, small dimensions, and the cutting drum can extend to the bottom of the bottom conveyor belt for operation, making it suitable for use in narrow roadways.

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 invention relates to a method for producing smokeless and odorless briquettes from fine-grained heterogeneous coal fractions using tamarind seed gum as a binder.

The invention discloses a coal blending system which is characterized in that all hard coal blending units and non-hard coal blending units in the coal blending system are arranged in a row along a first direction, namely all the coal blending units are arranged in a single row; different kinds of coal in the coal transfer station can be conveyed to the corresponding coal blending units only by arranging one first conveying component above the coal blending units, the number of conveying devices above the coal blending units is reduced by one time, the height of a feeding conveyor is reduced, dust removal devices are reduced, and the civil engineering investment cost is reduced.

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.

The invention belongs to the field of coal mine drilling, and particularly relates to a reamer for coal seam directional long drilling. Comprising a chambering cutter cylinder, strip-shaped grooves are evenly formed in the inner wall of the chambering cutter cylinder in the circumferential direction of the chambering cutter cylinder, cutter holders are slidably arranged in the strip-shaped grooves, and cutter wings are installed on the cutter holders; the tool aprons are further provided with ejector plates penetrating through the tool aprons in a hinged mode, driving parts used for driving all the tool aprons to synchronously slide up and down in the strip-shaped grooves are further arranged in the broaching tool cylinder, and the tool aprons are used for adjusting the positions, protruding out of the outer wall of the broaching tool cylinder, of the tool wings in the up-down sliding process in the strip-shaped grooves so that the cutting diameter can be adjusted. The driving part is further matched with the ejector plate to drive the ejector plate to swing to remove coal ash in gaps of the cutter wings. Layered cutting is used for reducing abrasion, self-cleaning heat dissipation is matched for maintaining the cutting efficiency, meanwhile, the hole diameter is dynamically adjusted in the reaming process, hole wall finishing is conducted in real time, the three parts form a function closed loop from a local part to an overall part, and the problems of cutter service life, chip removal and hole forming precision in hard coal seam reaming are jointly solved.

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 invention discloses an underground soft and hard coal identification method based on fine-grained image classification, and the method comprises the steps: constructing a BSMF-MobileNetV2 model, employing a gray histogram and a gray co-occurrence matrix to extract color and texture features through setting a single channel for the color and texture feature attributes of an image, carrying out the screening of the color and texture features based on a random forest algorithm, and carrying out the recognition of the soft and hard coal. Preferentially selecting the feature with the maximum inter-class difference to construct a feature fusion model; and the color texture attributes and the soft and hard coal image enhanced by the MSRCR algorithm are subjected to adaptive feature fusion, so that the characterization capability of the model on color and texture features can be enhanced, and the accuracy of the model is further improved.

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 invention discloses a large-dip-angle'double-hard 'fully mechanized caving face fracturing top cutting method based on a thickener, and relates to the technical field of large-dip-angle hard coal seam fracturing. The method comprises the following specific steps: determining technical parameters of viscous agent fracturing; topping presplitting drill holes are designed and arranged; selecting and preparing a thickening agent; carrying out viscous agent fracturing construction; and monitoring the fracturing effect and evaluating pressure relief. Through a customized thickener formula and a segmented packing fracturing process, the limitation of traditional blasting, water injection and hydraulic fracturing application scenarios is broken through, pressure relief treatment can be conducted on a large-dip-angle double-hard fully mechanized caving face, a crossheading roof rock stratum is made to generate cracks, a roof cantilever is cut off under stress during stoping advancing, it is guaranteed that a goaf roof caves smoothly, and the working efficiency is improved. And the goaf top suspending risk is reduced.

The present application provides a kind of extra-thick hard coal sub-region caving coal dynamic control method and device.The method collects top coal migration state data;Multi-source data processing is carried out using data level, feature level and decision level fusion algorithm, to generate top coal fragmentation degree evaluation results, caving state identification results and roof stability analysis results;According to top coal fragmentation degree evaluation results, caving state identification results and roof stability analysis results, multi-model collaborative reasoning is carried out using D-S evidence theory, fuzzy logic and Bayesian network, to generate the opening and closing time prediction and control instruction of each area caving gate;The control instruction is issued to hydraulic support through electro-hydraulic control system, to realize the differential opening and closing control of sub-region caving gate, and dynamically adjust the control strategy according to real-time feedback data.The present application realizes the sub-region dynamic precise control of extra-thick hard coal seam caving coal process, significantly improves the top coal recovery rate and reduces the gangue mixing rate and support instability risk, improves the mining efficiency and safety.

This invention relates to the field of coal mine roadway deformation control, specifically a method for preventing floor heave in coal mine roadways based on floor blasting pressure relief. The method includes: S1: determining the side support pressure curves of the coal seam and the side support pressure curves of the coal pillar or roadway backfill in the mining roadway; introducing Rankine earth pressure theory to analyze the stress characteristics of the mining roadway floor, determining the range of the coal seam side slip body and the range of the coal pillar or roadway backfill side slip body; S2: determining the blasting pressure relief strata in the floor; S3: determining the blasting pressure relief range; S4: blasting the determined blasting pressure relief range using blasting pressure relief boreholes. This invention selects the blasting pressure relief zone in the thick, hard coal seam floor, close to the slip body, allowing for floor heave prevention based on the minimum blasting pressure relief zone during construction; simultaneously, after determining the slip body using Rankine earth pressure theory, this invention determines a reasonable blasting pressure relief zone range based on the slip body and the support pressure.

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.