Bochumer Eisenhütte Heintzmann Gmbh&co. Kg

Bochumer Eisenhutte Heintzmann Gmbh & Co. Hg

Gustav Neu

Karl-Heinz Berger

Gunter Blumenthal

Siegmar Block

Ernst-Gunter Nerlich

A mining system comprises a laterally deflectable segmented conveyor extending longitudinally along a longitudinal face from which material is to be cut, a mining machine displaceable longitudinally along the conveyor and engageable with the face to cut material therefrom and deposit in the conveyor, and a longitudinal succession of support frames each having a respective actuator connected to a respective segment of the conveyor and each also having a respective a respective retractile roof-engaging flap. The process of this invention comprises bracing the frames and conveyor in a safety zone immediately adjacent the mining machine against the roof with their flaps retracted. The machine is advanced in the safety zone while cutting the face in the safety zone, and the flaps of the frames in a zone immediately downstream of the safety zone are sequentially retracted and the flaps of the frames in a zone upstream of the safety zone are sequentially advanced. The number of frames in the upstream and downstream zone is determined by the stability of the material of the mine roof. The conveyor segments are meanwhile pushed toward the face by extension of the actuators of the frames in a second zone immediately upstream of the upstream zone and the frames are themselves drawn toward the face by contraction of the actuators of the frames in a third zone immediately upstream from the second zone.

Electrohydraulic coal-mining system

A method in underground coal mining for separating the upper coal of the seam from the roof during the advancement of the upper sliding cap of a support frame, wherein the front edge of the cap is forced in a plane of the cap between the upper coal to be separated and the rock from which the coal is to be separated. During the advancement of the sliding cap, the sliding cap is alternatingly moved backwardly and forwardly, so that the from edge of the sliding cap separates the upper coal during its forward movement. Alternatively or additionally, when the front edge of the sliding cap contacts the upper coal, alternatingly higher and lower pressure can be admitted to the sliding cap in order to obtain a shaking effect. In this combined method, the sliding cap is advanced, the shaking procedure is carried out as the front edge contacts the upper coal, and the sliding cap is subsequently moved backwardly. The cycle is then repeated several times.

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Bochum, Germany

Gustav Neu