Double drum shearer is generally used inComprehensive mechanized coal miningProcess, cutting without cutting.Normal coal cutting is top coal cutting with front drum and bottom coal cutting with rear drum.hydraulic support And working faceScraper conveyorThey are connected by jacks and can be moved as supporting points for each other.
Chinese name
Double drum shearer
Foreign name
Double drum mining machine
Discipline
Coal engineering
Field
exploitation
Application
Comprehensive mechanized coal mining technology
Principle
The front drum cuts the top coal and the rear drum cuts the bottom coal
In order to improve the technology and production level of ordinary mechanized coal mining, the double rocker drum shearer with larger power is popularized to realize full height, reciprocating shuttle coal mining with one knife, oblique feed without cutting, and chain free traction to ensure safety and improvelabour productivity；For working face conveyorTwo speed motor, side discharge head and bottom sealing chute, etctechnologyThe chainless traction gear rail is installed to increase the conveying length, improve the conveying capacity and effectively solve the problem of heavy load starting.
Adopt new typeSingle hydraulic propAnd hinged top beam (or added with metal long joist) to support the working face. At the same time, roof cutting pillars can be used according to roof conditions.Light alloy single prop can be selected for the working face with large mining height (more than 2.5m).
This new generation of conventional mining equipment is suitable for mining coal seams with a height of 1.2-3m and an inclination of 0 ° - 25 °. The working face length can reach 200m. The MXP-240 shearer with a narrow and short body is suitable for crushing roof conditions.SZQ-75 and SZQ-90 transfer machines, SD-80 and SJ-80 can be used in the transportation lane of the working faceRetractable belt conveyor。
Compared with conventional mining with single drum shearer, the output and efficiency of this new conventional mining face can be increased by 20% - 30%.In Fengfeng Mining Area, the annual output of conventional mining teams adopting this process can generally reach 400000 t, and some can reach 800000 t[1]。
Machine application
Announce
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Comprehensive mechanized coal miningThe difference from ordinary mechanized coal mining technology is that the support of working face is mechanized.This process mode enables coal breaking, coal loading, conveyor transfer and supporthydraulic support All the main operations such as are mechanized, which greatly reduces the labor intensity and improves the unit yield and safety.
Comprehensive mechanized coal miningGenerally, double drum shearers are used in the process, without cutting.Normal coal cutting is top coal cutting with front drum and bottom coal cutting with rear drum.hydraulic support And working faceScraper conveyorThey are connected by jacks and can be moved as supporting points for each other.After coal cutting, the hydraulic support and conveyor can be moved in sequence in time;The conveyor can also be moved section by section, and then the support can be moved in sequence. The former is called the timely support mode, and the latter is called the lagging support mode;After cutting the coal to the upper roadway of the working face, the shearer can cut another knife or empty return and clean the floating coal when returning. The former is called two-way coal cutting mode, and the latter is called one-way coal cutting mode[2]。
main features
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Double drum shearer working face
Generally, the right drum of the shearer (in the direction of propulsion) is a right screw, which rotates clockwise when cutting coal;The left cylinder is a left spiral and rotates counterclockwise when cutting coal.When the shearer works normally, the front drum generally cuts along the roof, and the rear drum cuts along the floor.This arrangement is safe for drivers to operate, with less coal dust and good coal loading effect[2]。
Position and turning direction of drum of double drum shearer
Under some special conditions, for example, when there is hard dirt band in the middle of the coal seam, the left spiral right roller can be used to rotate counterclockwise;The left cylinder is a right spiral and rotates clockwise.In operation, the front drum cuts the bottom coal and the rear drum cuts the top coal. In the case of the lower part being mined out, the hard dirt band in the middle is easy to be broken down by the rear drum.
For some models of thin seam shearers, the drum and the machine body are on the same axis, and the front drum cuts out the bottom coal for the machine body to pass through, so the "front bottom and rear top" layout is also adopted.Sometimes it is necessary to adopt the "front bottom and rear top" type when passing through the geological structure. After the top coal is cut by the rear drum, the support shall be moved immediately to prevent the top coal or debris from collapsing[3]。
