31results about How to "Reduce the rate of penetration" patented technology

The invention relates to a long-wall coal method, which can be used in stable coal bed, rigid top plate, non-broken incline middle-thickness coal bed, and thick coal bed layered long-wall method. Wherein, it arranges hydraulic support, scrape transporter, and roller coal machine at the long-wall working surface; arranges groove transporter and flexible band transporter at the transport channel; the working surface has ultra long length, which is two times of integrated coal surface; it uses two coal machines on one scrape transporter, to scrape the upper half surface and the lower half surface; and it can arrange middle channel at the middle of integrated surface as the transport channel; and arranges scrape transporters at the upper and lower half working surfaces. The invention has high efficiency, while it can reduce the digging rate and improve the resource recycle rate.

The invention discloses a method for coal mining to the greatly oblique coal layer, comprising two steps: designing the method and back producing technique, placing slit flexible shielding support in the coal layer of 8-10m and deciding return airway and cutting point; the back producing technique includes enlarging airway, installing support, put down support and desinence of working face, etc. The method has simple operational steps as well as remarkable economic benefit.

The invention provides a method for mining coal from a heavy pitch thick coal seam in a horizontal and segmental short wall manner. The method comprises the following steps of: supporting and caving coal by using a top coal caving hydraulic support in a work surface; drilling holes, blasting coal, and conveying the coal with a scraper conveyor; performing gob-side entry retaining by using a prefabricated metal shed or a plastic bucket. The coal-mining method can realize mechanical mining of the heavy pitch thick coal seam, greatly improves yield and efficiency of the working face and ensures safe production.

The invention discloses a gob-side entry retaining method for an anchor bolt network gangue bag wall body for coal mining without pillars. The gob-side entry retaining method comprises the following steps of: A, crushing solid wastes obtained by separating tunneling gangue and/or coal gangue until the granularity is small than 0.1m and bagging by adopting plastic woven bags to obtain gangue bags; B, conveying the gangue bags obtained in the step A to the position of a working surface, which is used for building an entry, through an underground conveying system and fixing the gangue bags for building a roadside gangue bag wall body to form a gob-side entry; C, arranging the gangue bag wall body into a plurality of steps with different heights; and D, building the gangue bag wall body to the designed position and height and then mounting anchor bolts and paving a metal net, and simultaneously, paving a vertical protection steel belt, carrying out two-way anchoring or single-side pretightening in a large-pallet lane and keeping a gangue bag filling body in the gangue bag wall body in a three-dimensional stress state to achieve the functions of increasing the side pressure of the gangue bag filling body and improving the strength and the rigidity of the filling body.

The invention discloses a method for supporting a retained gob-side entry of the blasting-mining working faces of a small-area thin seam. The retained gob-side entry of the blasting-mining working faces of the small-area thin seam is supported through an I-shaped steel shed and timber, and single hydraulic props are adopted for reinforcing supporting. The supporting method includes the following steps of 1, advance supporting, wherein anchor rods are additionally anchored on the advance blasting-mining working face in a gate road, and the I-shaped steel shed is erected on the advance blasting-mining working face; 2, lagging supporting, wherein after the I-shaped steel shed is completely erected, single hydraulic props are erected on the lagging blasting-mining working face to reinforce supporting; 3, gob side caving, wherein after materials are fed back to the blasting-mining working faces, if a roof can not automatically fall, explosive-charging caving is carried out. According to the method, entry retaining is achieved through the I-shaped steel shed, the single props and explosive-charging caving; the gob-side entry retaining mode is low in investment, quick in effective response and high in benefit and safety factor, and is one of extremely-beneficial ways for enhancing safe production of a mine.

The invention provides a large-mining-height dual-fully mechanized mining face stoping process. The stoping process comprises the following steps: (1) determining whether the coal-seam thickness of a mining area of a working face to be mined is within the range of 3.5-7.0m, whether the geological structure is simple and relatively stable in thickness and whether the inclination angle is smaller than 12 degrees; and (2) arranging three parallel stoping tunnels in a main tunnel of a vertical mining area, communicating every two adjacent tunnels by use of an open-off cut to form a large-mining-height fully mechanized mining face, and then forming a left large-mining-height fully mechanized mining face and a right large-mining-height fully mechanized mining face, wherein the dip separation of the two faces is determined according to a formula as described in the specification. The large-mining-height dual-fully mechanized mining face stoping process is used for solving the technical problem that the large-mining-height fully mechanized mining face is incapable of breaking through the yield of 10 million tons/a to a large extent, and meanwhile, provides the enough security guarantee and cost control.

The invention discloses a large inclined angle coal seam gob-side entry retaining flexible roadway protection method which comprises the following specific steps: at the lower end of a working face, adopting a digging and blasting manner to construct an advance groove with the length being 5-10 m and the width being 3-5 m along the working face trend; in the advance groove, fixing an anchor rod through a top plate and a bottom plate, and arranging a specially-made reinforcing mesh to form a flexible structure; intercepting and wrapping gangue collapsing and sliding from a goaf to form a roadway-side supporting body; and enabling the roadway-side supporting body and a cable anchor in the roadway to jointly support and act to maintain the stability of roadway retained surrounding rock. The large inclined angle coal seam gob-side entry retaining flexible roadway protection method has the characteristics of being small to influence to working face production, low in roadway retained cost,simple in technology and high in roadway retained speed.

The invention discloses a mining, digging, transporting, supporting and ventilation integrated intelligent mining technology. The working surface arrangement manner is simplified, so that the tunneling work amount of a half-coal-rock tunnel is reduced effectively; and unmanned working surface mining with mining, digging, transporting, supporting and ventilation coordinated control is realized through automatic devices such as a double-drum coal cutter, a scraper conveyer capable of realizing right-angle turning, an automatic loading and unloading type support, a telescopic air duct and the like. Compared with traditional mining, the technology has the characteristics of simple working surface arrangement, low roadway tunneling rate, high coal production rate, high device automation degree,safe, capability of realizing efficient and intelligent mining and the like and has the broad popularization and application prospects.

The invention provides a thin coal seam coal pillar-free advancing type coal mining method. The method comprises the following steps: determining a mining area, arranging a roadway, arranging a working interval, mining and filling, and completely mining. The thin coal seam coal-pillar-free advancing type coal mining method has the following beneficial effects that a coal mining system is simple inarrangement, two working faces can be mined at the same time at a time, and the production efficiency is high; the working faces adopt a forward mining process, and three roadways simultaneously serve two working faces, so that the roadway driving rate is low, the coal discharging speed is high, and the mining connection tension is favorably relieved; a jump mining mode is adopted, the formed solid waste storage space is regular in shape, the two sides of the solid waste storage space are of solid structures, and regular filling bodies are easily formed; the goaf is used as a solid waste storage space, so that the underground waste space is effectively utilized, the mine pressure is weakened, the roadway retaining difficulty is reduced, and the surface subsidence is prevented; no coal pillar is left on the working face, and the coal resource recovery rate is increased.