31results about How to "Increase lump coal rate" patented technology

The invention discloses an advanced pre-splitting method for lump coal mining. The method with carbon dioxide pre-splitting and hydraulic fracturing combined is adopted, advanced pre-splitting of a working face is carried out on a coal layer needing mining in a multi-segmental mode from near to far in the advancing direction of the coal layer working face. The advanced pre-splitting method for every segment comprises the first step of hole drilling, wherein pre-splitting drill holes are drilled in the current pre-split segment; the second step of carbon dioxide pre-splitting, wherein a carbon dioxide pre-splitting device is installed in each drilled pre-splitting drill hole, the drill holes are sealed, and then pre-splitting is initiated; the third step of installation water injection pipes, wherein each pre-splitting drill hole is internally provided with one high pressure water injection pipe, and the holes are sealed; the fourth step of hydraulic fracturing, wherein water is injected into the pre-splitting drill holes through the high pressure water injection pipes to carry out hydraulic fracturing. According to the method, steps are simple, design is reasonable, the method is easy to implement and good in use effect, the problems that an existing deep hole blasting pre-splitting method is not safe, serious in pollution, high in investment cost, poor in use effect and the like are effectively solved, and the lump coal rate of a fully mechanized coal mining face is improved effectively.

The invention provides a mining machine with a rocker arm provided with coal-passing space, which comprises a machine body and a walking portion, and is characterized in that the mining machine with a rocker arm provided with coal-passing space also comprises a rocker arm, and cutting heads; the walking portion is disposed at the lower part of the machine body; the cutting heads are disposed at two ends of the machine body; the rocker arm is a rhomboid rocker arm or a single rocker arm; one end of the rocker arm is connected with the machine body, and the other end of the rocker arm is connected with the cutting heads; the rocker arm arches upwards to form the coal-passing space; the rocker arm is provided with the coal-passing space, which well solves the problem that coal falling by impact of a cutting head near a machine body of a reciprocating impact mining machine can not be conveyed out due to no coal-passing space between a straight rocker arm and a scraper conveyer, gives full play to advantages of high coal mining rate, high efficiency, energy saving, and environmental protection for reciprocating impact mining machines.

The invention relates to a semi-wedge type roller applied in coal cutter of coal mining equipment. In order to improve the block coal rate, a novel coal cutting theory and structure are adopted. The semi-wedge type roller is different from the conventional rollers mainly in three parts: the cutting disc (1), the wedge block (2), and the spiral blade (3). The cutting disc (1) is similar to the end plate in the conventional rollers and is used to dig a groove on the coal wall. The external surface of the wedge block (2) is a spacial inclined plane, the wedge block (2) is inserted into the groove as the coal cutter is moving forward, and the coal on the external side of the groove is cut off through the movement of the coal cutter and the rotation of the roller. The external edge of the spiral blade is in a shape angle shape and is not provided with any cutting pick, the spiral blade (3) is mainly used to store coals, and when the coals are not cut off, the sharp angle of the external edge of the spiral blade (3) will cut off the coals to assist the coal cutting.

The present invention relates to an underground driftway bunker, including coal scatter, running larry, belt machine and scraper conveyor, in the tunnel whose upper portion of the cross-section is made into the form of round arch, between one side wall of the tunnel and belt frame a footway is set, and on the belt frame and track rail of middle partition wall the coal scatter and running larry are set, said larry is connected with pull steel rope, under the coal scatter the belt machine is set, and between the inner side of the partition wall and outside of inward inclined partition in the tunnel the coal bunker whose upper portion is wide and lower portion is narrow can be formed. Said invention can raise block coal rate and its construction is simple.

The present invention relates to a rock helical groove anti-breaking bunker, including inlet guide device and coal-feeding machine, on the rock between upper tunnel and lower tunnel a vertical cylindrical bunker body is cut, and the upper circular hole of said bunker body is equipped with a sealing grate with inlet, and the lower end of said bunker body is equipped with a reduced cone hole whose bottom outlet is equipped with coal-feeding machine, said coal-feeding machine is equipped with helical groove cut into the inner wall of the cylindrical rock bunker body, and the upper end of the helical groove is connected with the inlet of the sealing grate. Said invention has good effect for preventing coal block from being broken, and its coal block breaking rate is low.

A gate roadway loader raw coal transporting and crushing system for underground coal mining comprises a scraper conveyer, a gate roadway loader and a belt conveyer which are sequentially connected end to end from right to left. A supporting connection piece and a roll crushing mill are arranged between the unloading end of the gate roadway loader and the self-advancing tail of the belt conveyer. A movable connection piece is arranged between the roll crushing mill and the self-advancing tail of the belt conveyer. According to the gate roadway loader raw coal transporting and crushing system for underground coal mining, the roll crushing mill and the gate roadway loader synchronously move at the self-advancing tail of the belt conveyer through the supporting connection piece and the movable connection piece; and not only can the gate roadway loader and the roll crushing mill move at the self-advancing tail of the belt conveyer, but also the position between the roll crushing mill and the unloading end is fixed relatively, and squeezing and crushing of materials are achieved.

The invention relates to the field of coal-cutting machinery, and particularly relates to a duplex pickaxe type cutting tooth holder of a drum shearer. The lump coal rate, the powdered coal quantity, the cutting tooth specific energy consumption and the like are influenced by a geometric construction and a spatial arrangement of an existing pickaxe type cutting tooth holder. The invention provides a novel tooth holder, which is capable of being simultaneously provided with two pickaxe type cutting teeth and can be arranged in a parallel, outwards inclining or inwards inclining manner along a spiral blade, and is directly welded on a spiral drum through a tail handle according to a certain principle. Under the condition that structure parameters and cutting tooth quantities are same, the quantity of cutting teeth distributed on the blade of the spiral drum can be reduced so that the unit area of the cutting teeth acting on the coal petrography is large. The duplex pickaxe type cutting tooth holder has the beneficial effects that the coal petrography is crushed by adopting the pickaxe type cutting teeth of the duplex pickaxe type cutting tooth holder, a gap between every two adjacent cutting teeth can be increased to ensure that the coal cutting capacity is enhanced and the unit area of the cutting teeth acting on the coal petrography can be increased, the grinding force on the contact surface is reduced, the lump coal rate is increased, the powdered coal quantity is reduced, and the unit cutting energy consumption is lowered.

The invention relates to a crossheading bidirectional transporting, screening, crushing and transloading system and relates to the technical field of transloading machines. The crossheading bidirectional transporting, screening, crushing and transloading system comprises a crushing device, a screening device and a bidirectional transporting device. The crushing device and the screening device arearranged a landing section and are connected. The screening device is a screening groove and comprises a screening middle plate and a screening bottom plate. The screening middle plate is located on the upper part of the screening bottom plate, and screening holes are formed in the screening middle plate. The bidirectional transporting direction of the bidirectional transporting device is matchedwith arranging positions of the crushing device and the screening device, so that raw coal on the crossheading transloading machine is screened and crushed successively and transported to a belt conveyor. The length of a suspended section is reduced greatly while the lump coal rate is improved, so that the length of a self-moving tail of the belt conveyor is further reduced. The crossheading bidirectional transporting, screening, crushing and transloading system is matched with a complex environment under a coal mine, so that it is ensured that the device is shifted relatively smoothly, problems as a result of too long self-moving tail of the belt are further avoided, and safety accidents are reduced.

The invention discloses a drilling and planing part of a thin coal seam drilling and planing combined coal mining machine. Two sets are symmetrically arranged front and back relative to a coal miningmachine fixing box, the two sets of thin coal seam drilling and planing combined coal mining machine drilling and planing parts are installed on the front portion and the rear portion of the coal mining machine fixing box through drilling and planing box shells respectively, each drilling and planing part of the thin coal seam drilling and planing combined coal mining machine comprises a transmission device and a drilling and planing coal mining device, and each drilling and planing coal mining device comprises a hollow drilling part, a crushing drilling part and a coal planing disc part. Thedrilling and planing part of the thin coal seam drilling and planing combined coal mining machine adopts two-stage planetary reduction transmission, and the modes of high-speed stage planetary carrierfloating and low-speed stage sun wheel shaft floating are adopted in the two-stage planetary reduction transmission process, so that the drilling and planing combined coal mining machine is compact in structure, small in size, large in transmission ratio and stable in operation; the mode that drilling and planing combined coal mining is conducted through the drilling and planing coal mining device is adopted, the thin coal seam mining production efficiency can be improved on the premise that the machine body length is effectively shortened, the coal loading effect is improved, the lump coal rate is increased, and the drilling and planing part of the thin coal seam drilling and planing combined coal mining machine is particularly suitable for thin coal seam mining.

The invention relates to the technical field of coal mine equipment, particularly to a coal leakage preventive device of a belt conveyor. The coal leakage preventive device comprises a coal stop board arranged above a belt and used for stopping coal briquettes, and the coal stop board is provided with a concave camber surface with the opening facing the direction of the coal briquettes and used for reducing the speed of the coal briquettes. Compared with the prior art, the opening of the concave camber surface of the coal stop board faces the direction of the coal briquettes, when the coal briquettes bump against the concave camber surface, not only speeds of the coal briquettes are reduced, but also stressed areas of the coal briquettes are reduced, the possibility that the coal briquettes are crashed is reduced, and therefore the lump coal rate of the coal briquettes can be improved.

The invention discloses an anti-falling alloy cutter head, which comprises a work section and a connecting section, wherein two parts including a wave-shaped curve surface section and a cone surface top end are processed on the work section; a diamond layer is arranged on the cone surface top end; and the diamond layer and the wave-shaped curve surface section are in smooth transition connection. The anti-falling alloy cutter head has the advantages that the design is reasonable; the structure is simple; the problem of hard alloy falling is solved; the hardness, the strength and the wear-resistant performance of the alloy cutter head are greatly improved; and the service life of the alloy cutter head is prolonged.

The invention provides a drilling and plowing type coal winning machine plow head which comprises a coal plowing device; the coal plowing device is composed of a plane cutter, cutter seats, a planing body which has an asymmetric structure and a coal drilling device; the cutter seats on the left and right sides are arranged in a staggering manner; the coal drilling device is composed of four explosion-proof motors and four conical drills; the explosion-proof motors are arranged in the planing body; the output ends of the explosion-proof motors are directly connected with the conical drills respectively; and the conical drills are arranged on the left and right sides of the planing body in the staggering manner. The drilling and plowing type coal winning machine plow head can effectively lower the coal plowing difficulty, greatly improves the coal plowing efficiency, can effectively solve the problem of mining thin coal seams with large hardness and no joint development, greatly improves the mining efficiency of the thin coal seams and is wide in application range.