37results about How to "Reduce coal mining costs" patented technology

The invention relates to a pick having a bimetal structure and a preparation method thereof, in particular to a pick and a preparation method applicable to coal mining machines and tunneling machines capable of cutting coal seams and rock strata, belonging to the technical field of the research on mining machinery metallic materials and geotechnical engineering. The pick is characterized in that the pick body consists of two metals, wherein the most wear-prone top end of a pick head of the pick is made of tailor-made alloy steel; the wear-resistant lower ends of the pick handle and pick head are made of medium carbon alloy steel; a plurality of ring-shaped grooves are formed below the top end of the pick head; an interlayer is arranged between every two adjacent ring-shaped grooves; the ring-shaped grooves are subjected to full-surfacing process by using the tailor-made alloy steel welding rods; and since the interlayer is thin, the integral wear-resistant tailor-made alloy steel can be formed at the top end of the pick head. The pick of the invention has the advantages of simple structure, novel design, high practicability, convenient fabrication, high hardness and wear resistance and good impact-resisting and corrosion-resisting performance; and according to industrial tests, compared with the homemade pick, the service life of the pick is prolonged by 20 to 30 times, thus saving a great deal of alloy steel materials for our country and reducing the mining cost.

The invention discloses a helical shearer roller. The roller comprises a roller body and combined helical blades arranged on the drum body, wherein pick seats are installed on the helical blades; cutting picks are installed on the pick seats through pick sleeves; the cutting picks comprise rods and heads arranged at one ends of the rods; the heads are of a conical structure; and conical alloy heads are welded at the front ends of the heads. The roller has the following beneficial effects: the heads of the cutting picks of the roller are of a conical structure and the conical alloy heads are fixed at the front ends of the heads, so the mined coal is briquette when the shearer with the cutting picks of such a structure is adopted for mining; and the roller not only has a simple structure but also has high mining efficiency, thus relatively lowering the mining cost.

The invention discloses a gas-water injection device and a dust control system for dust produced by cutting of a coal cutter. The dust control system adopts the structure that a rocker is arranged on a coal cutter, a coal cutting roller is arranged at the front end of the rocker, an extracting dust removal blower is arranged on each of two sides of the coal cutter, air intake cylinders of the extracting dust removal blowers are arranged along the rocker and extend to the coal cutting roller; an obliquely arranged mounting bar is arranged on the rocker; the center of the tail end of the mounting bar and the center of the coal cutting roller are located on the same horizontal line; three gas-water injection devices are uniformly arranged at the tail end of the mounting bar with 120 degrees' angles formed among the gas-water injection devices. According to the gas-water injection device and the dust control system, the particle diameters of fog drops are reduced, a compact gas-water curtain with a relatively large gas specific weight is finally formed, dust is controlled by the gas-water curtain generated by the air-water linkage injection device, and dust produced by cutting of the coal cutter is extracted and processed by the extracting dust removal blowers, so that the dust concentration on a coal face is effectively reduced, the dust control system is formed, and at the same time, the visibility of the working face is improved.

The invention discloses a steep coal-seam coal mining and transportation apparatus and coal mining and transportation method. The steep coal-seam coal mining and transportation apparatus comprises a coal mining unit, a coal transportation unit and a control system, wherein the front end and the rear end of the coal mining unit are serially connected onto an annular flexible traction element, the flexible traction element is driven by a positive-inversion-output rotating drive unit to drive the coal mining unit to go forward or withdraw, and the rear part of the coal mining unit is provided with a coal mining part for intercepting a lower coal and rock mass to form a trough; the flexible traction element of a set length which is arranged behind the coal mining unit is of a traction chain structure, a plurality of rows of coal scraper plates which can go deep into the trough are distributed in the length direction of a traction chain section, and the traction chain and the coal scraper plates form the coal transportation unit. The method is implemented by utilizing the steep coal mining and transportation apparatus. The method comprises the following steps: facilitating the forward rotation of the drive unit, and driving the coal mining unit to go forward to intercept coal; enabling the drive unit to rotate reversely, and driving the coal scraper plates on the traction chain to transport the coal by virtue of the trough formed after the coal is intercepted. The apparatus and the method have the beneficial effects that the coal mining apparatus is simple in structure and low in manufacture cost, and the coal mining method is high in coal mining efficiency and safe in coal mining.

The invention provides an ultra-thin coal seam longwall mining method based on an N000 construction method, and relates to the technical field of mining. The ultra-thin coal seam longwall mining method includes the steps that advancing operation is performed on a working face in the direction perpendicular to the working face to form a first roadway, and the first roadway is supported to form a first gate road; an advance working area is formed in the first gate road; coal mining machines are adopted to simultaneously mine coal in the advance working area in the direction parallel to the working surface towards both sides of the first gate road, and a mined coal body is transported to a scraper conveyor; when the coal mining machine located on one side of the first gate road runs to a first preset position, the working face is blasted to form a second roadway, and the second roadway is supported to form a second gate road; and when the coal mining machine located on the other side of the first gate road runs to a second preset position, the working face is blasted to form a third roadway, and the third roadway is supported to form a third gate road. According to the ultra-thin coalseam longwall mining method based on the N000 construction method, roadway tunneling in advance can be avoided, the coal mining cost is reduced, the coal mining efficiency is improved, and the wasteof resources is avoided.

The invention relates to a beam-reserving open pit mining technology in a narrow mining area. The beam-reserving open pit mining technology comprises the following steps that a, mining areas are divided, an open-pit mining right realm is divided into the multiple long-strip-shaped mining areas, the position of a mining pit is divided in each mining area, and soil beams are reserved between every two adjacent mining pits as well as between the mining pits and the mining right realm; b, excavation equipment is used to conduct mining on the first batch of mining areas, and mining is conducted according to the preset positions of the mining pits; c, mining is conducted on coal, mined from the first batch of mining areas, under the soil beams on the peripheries of the mining pits by using a slope coal cutter; and d, mining is conducted on the second batch of mining areas, mining is conducted according to the preset positions of the mining pits, and the mining pits are subjected to downwardmining through a spiral linear adit mode. The mining method is suitable for all open-pit mines, revolutionary changes can be generated on open-pit mining, and the mining technology further greatly reduces the open-pit mining cost while improving the adaptability of open-pit coal mine mining.

The invention discloses a shield support without a front beam of the shield support and a withdrawing method and relates to a shield hydraulic support and a withdrawing method by means of the shield support. The invention aims to solve the problem that an existing shield hydraulic bracket needs to be provided with the front beam of the shield support, which is large in weight and inconvenient to move. One end of a base is fixedly connected or hinged to one end of a shield beam connecting plate or a shield beam connecting rod, and the middle of the base is fixedly connected or hinged to the low end of a top beam hydraulic column; one end of the shield beam is hinged to the other end of the shield beam connecting plate or the shield beam connecting rod; the other end of the shield beam is hinged to one end of the top beam while the other end of the top beam is a top beam edge which is not connected to any devices, and the middle of the top beam is hinged to the top end of the top beam hydraulic column; the top beam is 2.1m long; and one end of the shield beam hydraulic support column is hinged to the middle of the shield beam while the other end of the shield beam hydraulic support column is hinged to the base. The shield support disclosed by the invention is suitable for the withdrawing operation of a hydraulic bracket on an underground coal face.

The invention discloses a hole cutting and slope expansion construction technology for a fully-mechanized working face of a complex coal bed, and relates to the technical field of coal mining. The construction technology solves the problems that an existing mining method is low in efficiency and safety coefficient, high in labor intensity and long in construction period, and safety production and rapid installation of cut holes are not facilitated. The construction technology includes the steps: firstly, respectively performing slope expansion on two sides of an original hole cutting area by the aid of a shipment system of an original cut hole; secondly, performing undercutting for an area below the original hole cutting area; finally respectively performing undercutting for two sides of the area below the original hole cutting area until hole cutting and slope expansion are finished. Simultaneous slope expansion of two sides of the original hole cutting area are performed, double drilling machines can parallelly work on the working surface, exposed time of roofs is shortened, working efficiency is improved, workload manually sweeping coat is reduced, and labor intensity of workers is relieved. Compared with a past construction method which is characterized in that roof brushing is firstly performed, slope expansion is performed, and upper coal is reserved, secondary supporting caused by roof brushing is avoided, and coal mining cost is reduced.

The invention relates to a coal mine pressure bearing plate and a manufacturing method thereof, the coal mine pressure bearing plate comprises an ultra-high molecular weight polyethylene plate body, a clamping block is arranged in the middle of a first side edge of the plate body, an opening matched with the clamping block is formed in a second side edge opposite to the first side edge, a plurality of grooves are formed in the back surface of the plate body, and the grooves are matched with the clamping block. The bearing plate is made of ultra-high molecular weight polyethylene with the molecular weight not lower than 350,000 and double-resistance master batch in a mold pressing mode according to the proportion not larger than 3: 2. When in use, the pressure-bearing plates are directly spliced on the road surface, and after splicing is completed, a support transfer trolley can pass through the pressure-bearing plates. Compared with the prior art, the method has the advantages that the existing hardening process required by cement is omitted, the splicing operation is fast and convenient, the pavement can be hardened more efficiently, the coal mining operation is accelerated to a certain extent, and the coal mining cost is saved.