15 results about "Longwall mining" patented technology

This invention discloses a method for coordinated unloading-support-filling roadway protection in a longwall mining face of a steeply inclined coal seam. The method includes: arranging pre-reinforcing anchor bolts and cables at certain intervals in the transport roadway to reinforce the transport roadway in advance; pre-excavating a gap in the upper side of the transport roadway by blasting, and adding reinforcing anchor bolts and cables to the cross-section of the pre-excavated gap; arranging pressure-relief boreholes at certain intervals in the center of the coal seam roof at the pre-excavated gap, and implementing pressure-relief blasting after the support is moved; using I-beams and retractable modular roadway protection supports as the first and second layers of rock-blocking support, respectively; filling and sealing the goaf area above and on the sides of the retractable modular roadway protection supports with local filling materials; and arranging single hydraulic props for delayed support at a certain distance from the coal wall of the lagging face inside the roadway along the goaf. This method provides good support, significantly increases the speed of roadway retention in a longwall mining face of a steeply inclined coal seam, and effectively ensures safe and normal production.

The invention relates to a shearer loader for longwall mining, having a machine body (1) which is movable along a face conveyor (7) in the longitudinal direction (S) of the longwall by means of a drive device and having at least two drum arms (4) which are pivotally attached to the machine body (1) and at the free ends of each of which a cutting drum (5) is rotatably mounted, the machine body (1) having a support structure which is formed by a bracing of at least two support elements (3) in the longitudinal direction (S) of the longwall, and the machine body (1) comprising functional units (2). The aim of the invention is to further develop the shearer loader in such a way that the structural design of the machine body (1) allows larger dimensions of the shearer loader in order to work face thicknesses of 10 m and more. According to the invention, this is achieved in that the support elements (3) are designed as frame elements (8), each of which has an installation space (9) for the functional units (2).

This invention discloses a method for intelligent roof control and diversion to prevent sudden and abnormal gas outbursts in goaf areas. This method involves determining the initial and cyclical pressure step distance, optimizing the design and construction of roof control and diversion borehole parameters, introducing a controllable, slow-release static fracturing agent into key strata, installing stainless steel screens and sealing and continuously pumping out the gas, intelligently controlling the coupling of roof fracturing and diversion / extraction parameters, evaluating and optimizing the effects, and cyclically executing the method as the working face advances. This forms a collaborative prevention and control system of "active weakening - intelligent control." This invention shifts the disaster management operation space from the longwall mining face to the floor drainage roadway, and the roof weakening method shifts from traditional blasting to a safe, environmentally friendly, and controllable static fracturing agent pre-fracture method. The management approach shifts from single-hazard management to multi-hazard collaborative management, achieving intelligent roof control and diversion to prevent sudden and abnormal gas outbursts in goaf areas. This fundamentally eliminates the adverse effects of strong mine pressure manifestations and abnormal gas outbursts in goaf areas on safe production, curbing risks at the source.

This invention discloses a method for determining the grouting layer and timing of artificially consolidated bodies, comprising: obtaining the theoretically calculated grouting layer of the artificially consolidated body based on shallow-buried fully mechanized longwall mining parameters; obtaining the grouting layer and earliest grouting timing of the artificially consolidated body using measured overburden movement data; determining the latest grouting timing of the artificially consolidated body using measured surface subsidence data; establishing an evolution model of the artificially consolidated body controlling the porosity of the mining space using computer numerical simulation, and determining the optimal theoretical grouting timing and theoretical grouting timing range for the artificially consolidated body with the largest porosity; finally, verifying and adjusting the grouting timing based on measured grouting volume of key rock strata, grouting timing, and porosity below the artificially consolidated body to obtain the final grouting timing range for the artificially consolidated body. This method achieves precise control of the mining space in shallow-buried fully mechanized longwall mining by accurately and reasonably determining the grouting layer and grouting timing of the artificially consolidated body.

The utility model relates to dust removal technical field, concretely relates to a coal mine fully mechanized caving and continuous mining dust falling device, including support pipe, the upper end of support pipe is equipped with the open -ended downward air outlet, the lower extreme is equipped with the air inlet, the plugging disc and filter cartridge are equipped with cleaning mechanism between, the multiple of cleaning mechanism are evenly arranged at intervals, cleaning mechanism includes outer partition, inner partition, outer partition is equipped with cleaning groove, the inside of cleaning groove is equipped with sweep ash subassembly, inner partition is equipped with auxiliary groove, auxiliary groove and cleaning groove enclose the closed cleaning cavity, multiple cleaning mechanism divide filter cartridge into the filter area and cleaning area of alternately arranged, the process of power mechanism drive plugging disc drive cleaning mechanism rotation, the filter area of filter cartridge carries out filtration, sweep ash subassembly carries out cleaning to the cleaning area of filter cartridge, realizes the synchronous of filter cartridge's filtration and cleaning, simultaneously, along with the rotation of plugging disc, the filter area and cleaning area of filter cartridge are alternately converted, make filter cartridge keep higher filtration efficiency all the time, has improved dust removal efficiency.

This disclosure proposes an intelligent recognition method and device for video images from fully mechanized mining faces, relating to the field of coal mine safety image recognition technology. The method includes: acquiring video monitoring images of the fully mechanized mining face, including images acquired by an image acquisition device mounted on a hydraulic support; identifying the fully mechanized mining face based on the video monitoring images to obtain successfully identified target objects and assigning them numbers; acquiring feature data of the target objects and updating their status information based on the feature data; and generating a display image based on the updated status information, the target object's number, the video monitoring images, and the physical number of the hydraulic support. Thus, by acquiring video monitoring images, identifying target objects, and obtaining their feature data, the status information of target objects can be accurately monitored and updated in real time, increasing the efficiency and accuracy of video monitoring recognition.

This invention discloses a method and apparatus for coordinating coal and gangue roughing and backfilling of the goaf in a fully mechanized longwall mining face, belonging to the field of green coal mining and underground solid backfilling technology. This invention aims to solve the technical problems in existing fully mechanized longwall mining faces, such as high cost of gangue removal from the surface, significant water waste, limited underground disposal capacity, and delayed goaf backfilling. The method of this invention includes: longwall mining and raw coal transportation, underground coal and gangue roughing, reverse gangue transfer, and dry gangue backfilling in the goaf. The apparatus of this invention includes a coal mining device, a transportation device, a sorting device, a transfer device, and a backfilling device, which work in coordination through an optimized arrangement of scraper conveyors, belt conveyors, gangue removal supports, and a high-speed gangue thrower. This invention realizes an integrated closed-loop process of "coal mining-roughing-backfilling", which allows gangue to be backfilled as it is mined without having to be brought to the surface. This significantly improves the efficiency of gangue disposal, reduces mining costs and water consumption, effectively controls roof collapse, and ensures operational safety. It is an important innovation in the field of green mining.

The invention relates to a drum shearer for longwall mining, comprising a machine body (1) that is movable along a longwall conveyor (6) in the longitudinal direction (S) of the longwall by means of a drive device, at least two drum arms (4) pivotably attached to the machine body, at the free ends of which a cutting drum (5) is rotatably mounted, wherein the machine body (1) has a supporting structure and wherein the drive device comprises two or more drive units (3), each with at least one drive motor (3c), a winch gearbox (3b), and a wheel housing gearbox (3a). The object of the invention is to further develop the drum shearer in such a way that the drum shearer is more flexible overall in operation.The invention proposes that the supporting structure of the machine body (1) is formed by a frame element (11,8) and that the drive units (3) can be fixed to the frame element (11,8) in a height-adjustable manner via connecting means.

This invention discloses a method for determining the extraction locations of horizontally oriented long boreholes within the overlying strata of longwall mining, comprising the following steps: S1, based on the mining method and parameters of the working face, and the lithological characteristics of the overlying strata, and after analyzing the distribution of gas migration fracture channels in coal seam mining and the stability of boreholes affected by mining activities, the range of extraction locations for directional long boreholes is determined; S2, within the range of extraction locations for directional long boreholes, the location criterion value for each location is calculated; S3, based on the magnitude of the location criterion value for each location, the specific location and order of each borehole are determined. This invention reveals the extraction mechanism of horizontally oriented long boreholes from three aspects: the degree of gas accumulation within mining fractures, the permeability of mining strata, and the stability of mining boreholes. It proposes location criteria for horizontally oriented long boreholes and provides a method flow for determining the extraction locations of boreholes.

The invention relates to a shearer loader for longwall mining, having a machine body (1) which is movable along a face conveyor (6) in the longitudinal direction (S) of the longwall by means of a drive device and having at least two drum arms (4) which are pivotally attached to the machine body and at the free ends of each of which a cutting drum (5) is rotatably mounted, the machine body (1) having a support structure, and the drive device having two or more drive units (3), each of which has at least one drive motor (3c), a winch transmission (3b), and a wheel house transmission (3a). The aim of the invention is to develop the shearer loader such that the shearer loader is more flexible overall during use. For this purpose, the invention proposes that the support structure of the machine body (1) is formed by a frame element (11, 8), and the drive units (3) can be fixed to the frame element (11, 8) at an adjustable height via connecting means.

This invention discloses a multi-field coupled method and device for controlling the stability of narrow coal pillars in fully mechanized longwall mining, relating to the field of coal mining safety. The method includes: collecting basic parameters of the coal and rock mass; constructing a four-field coupled mathematical model of stress, damage, seepage, and temperature; calculating the stability coefficient and dividing the region into stable, plastic development, and critical instability zones; employing layered grouting with deep and shallow holes, constant resistance large deformation anchor cable support, and large-diameter precise pressure relief coordinated control; and achieving full life-cycle regulation through long-term dynamic monitoring and feedback correction of the model and control parameters. The device includes modules for data acquisition, model construction, region division, coordinated control, and dynamic regulation. This invention overcomes the shortcomings of traditional single-field analysis and fixed control, ensuring long-term stability of the coal pillar through multi-field coupled precise evaluation, zoned differentiated control, and dynamic feedback, and is suitable for controlling narrow coal pillars in fully mechanized longwall mining faces.

This invention relates to the field of coal mining technology and discloses a static fracturing device and construction method for the end of a fully mechanized longwall mining face with a water-rich roof. The method includes the following steps: opening seepage holes in a rigid push pipe, wrapping it with long-filament non-woven geotextile, and installing a one-way check valve; covering it with a high-extensibility waterproof flexible membrane and arranging hydrophilic polyester fiber strips to seal and form an annular cavity; loading high-energy gas-free static fracturing agent components, folding and compressing the high-extensibility waterproof flexible membrane after vacuuming, and binding it with polyvinyl alcohol water-soluble tape; pushing the device into the borehole for water injection; maintaining pressure and using the one-way check valve to seal the high-pressure water column. This invention isolates external water bodies through a high-extensibility waterproof flexible membrane, eliminates gaps through high-pressure water injection, and uses hydrophilic polyester fiber strips for radial water guidance. The one-way check valve achieves synergistic fracturing through hydraulic pre-tensioning and chemical expansion, effectively solving the problems of easy failure of fracturing agents and low stress transfer efficiency in water-rich roofs.

The invention relates to a drum shearer for longwall mining, comprising a machine body (1) that is movable along a longwall conveyor (7) in the longitudinal direction (S) of the longwall face by means of a drive device, at least two drum arms (4) pivotably attached to the machine body (1), at the free ends of which a cutting drum (5) is rotatably mounted, wherein the machine body (1) has a supporting structure formed by a bracing of at least two support elements (3) in the longitudinal direction (S) of the longwall face, and wherein the machine body (1) comprises functional structural units (2). The object of the invention is to further develop the drum shearer in such a way that the structural design of the machine body (1) enables a larger dimension of the drum shearer for processing longwall thicknesses of 10 m and more.The invention proposes that the supporting elements (3) are designed as frame elements (8), each of which has installation space (9) for the functional building units (2).

This invention discloses a method and apparatus for detecting impact hazard zones in a longwall mining face based on direct current resistivity. The method includes: setting up a data measurement device in the impact hazard zone of the longwall mining face, including electrodes, measuring lines, and a measurement host; the electrodes are connected sequentially by measuring lines, and the ends of the measuring lines are connected to the measurement host; after selecting the observation device type, the measurement host emits current outward using the power supply electrodes, and the measuring electrodes receive the current emitted by the power supply electrodes, forming a covered measurement range through the emission and reception of current; the measurement host calculates the apparent resistivity distribution characteristic data within the measurement range based on the current differences received by the measuring electrodes; the apparent resistivity distribution characteristic data within the measurement range is processed according to a three-dimensional resistivity inversion algorithm to obtain the three-dimensional apparent resistivity distribution result within the measurement range; and the impact hazard level within the impact hazard zone of the longwall mining face is determined based on the three-dimensional apparent resistivity distribution result.

The application discloses a kind of determination methods of precision protection separation layer grouting parameters of surface target in mining area, and the application is finally obtained grouting drilling depth, grouting pressure, grouting drilling position according to the mining geological conditions of working face, surface and overburden movement and deformation parameters, surface protection target grade and the relative position relationship of surface protection target and working face.Through the grouting drilling of surface protection target construction, separation layer grouting is carried out, the change from yes to no of mining influence from far to near surface protection target is realized, the normal mining of longwall working face is not affected, and the surface movement and deformation near surface protection target is eliminated, so as to realize the precision protection of surface protection target facilities in the mining influence range of longwall mining working face.The precision protection of surface (only protection arrangement is carried out to surface protection target) is realized, the double purposes of safe and efficient recovery of working face and the stability of surface protection target are ensured.