52results about How to "Reduce resource loss" patented technology

The invention discloses a continuous mining method of a gently inclined vein based on a combined checkerboard type bottom structure. The continuous mining method comprises the following steps that (1) an ore body with the inclined angle being 20-35 degrees is divided into middle sections along the tendency of the ore body, inclined top pillars, ore rooms and ore pillars are reserved at the upper ends and the lower ends of the middle sections correspondingly, the ore rooms and the ore pillars are divided and alternately arranged along the trend of the ore body, and an extraction sequence that the ore rooms are mined firstly and then the ore pillars are mined is implemented; (2) a checkerboard type ore removal structure is set below the ore body, and V-shaped trenches are formed at the bottoms of each ore room and each ore pillar; (3) a plurality of short draw shafts are arranged at the bottom of each V-shaped trench at intervals in the horizontal direction of each V-shaped trench, the upper portions of the short draw shafts are connected with the V-shaped trenches, and the lower portions of the short draw shafts are connected with mining roadways of the checkerboard type ore removal structure; (4) extraction is conducted on the ore rooms; and (5) under the protection of a cementation body of an ore room goaf, extraction is conducted on the ore pillars. The continuous mining method of the gently inclined vein has the advantages that production capacity of a panel stope is large, ore removal time is short, the mining safety is high, resource loss is little, and the ore removal structure is reasonable.

The invention relates to a method for cutting and pre-breaking top coal to improve mining efficiency by utilizing water power, which solves the problem that a relatively hard and complete roof coal seam, particularly a coal seam tightly attached to an upper rock body, is difficult for top coal caving, large in coal falling lumpiness and not high in mining efficiency. The method comprises the following steps of: drilling advanced boreholes in a roof coal body to a coal rock boundary surface on a mining working surface by utilizing a drilling machine; extending a high-pressure water pipe in the boreholes; and cutting a plurality of subhorizontal semicircular transverse slots by utilizing the impact force of high-pressure water from top to bottom in the top coal. A plurality of yielding regions are formed by the boreholes in linear distribution in the roof coal body, the mechanical conditions in the coal body are changed, the hard and complete coal body is promoted to be deformed and broken under the effect of advanced concentrated stress, and a plurality of cracks are generated; the coal-rock and coal-coal contact areas are reduced through the transverse slots, and the coal body on the boundary surface is further extruded under the effect of roof high stress, so that the coal body is broken, the adhesive power is lost, manual layering is achieved, and coal is convenient to fall. The method is simple and quick, high in operability and good in timeliness, the coal mining speed can be efficiently increased, and the mining efficiency of the top coal is improved.

The invention discloses an energy-saving electronic scale, comprising support plates, a turnover piece, a sensor I, a scale body, a scale plate, a lifting piece, a display screen and a sensor II, wherein the surface of the covered scale body is rectangular, the scale body is composed of left and right cylinders and a middle combined plate, the sensor I is arranged on the left of the scale body, the scale plate is arranged on the left surface of the scale body, the sensor II is arranged on the right of the scale body, the display screen is arranged on the right surface of the scale body, the support plates are arranged on the two sides of the scale body, and the inner sides of the support plates are movably connected with the turnover piece in a rotating fit manner. The electronic scale is provided with the lifting piece, and when the support plates cover the scale body and are fixed, inner fasteners are held and a supporting part is pulled via special elasticity of a spring damping piece, and the supporting part drives the scale body to move, so that the electronic scale held on hands is prevented from slipping due to external force, the loss of resources can be reduced, and the electronic scale is energy-saving.

The invention discloses a middle-waisted bidirectional filling and mining method under canopy guard in a thick and great metal mine in sea bed, which is characterized in that a safety isolating layer is preserved between an ore body and the sea bed; the ore body is divided into an upper part and a lower part at the middle waist in the altitude direction; the altitude from the middle waist position to the sea bed sea mud is 100-150m; stoping is carried out from the middle waist position of the ore body, wherein the upper part adopts upstroke mining and the lower part adopts downstroke mining; a rock trackless quasi-upward slicing cemented method with a regular post pillar is adopted in the upstroke mining method; a rock trackless quasi-ordinary slicing cemented method is adopted in the downstroke mining; the gob in the stope is filled with filling materials. The invention is characterized by having high safety of mining, little loss of resources, high degree of mechanism, low labor intensity, great production capacity, short stoping time, low mining settlement and the like.