Abstract: A shearer drum for a mining machine used in underground mining is provided with cutter picks and nozzles on the periphery of the drum. The nozzles are subdivided into groups which extend substantially parallel to the rotational axis of the drum and each group of nozzles can, when disposed opposite the mine face, be connected by a controllable valve associated with the group to a line for supplying high-pressure liquid. An independent control valve and at least one cutter pick are associated with each nozzle group. The cutter pick is resiliently mounted and cutting pressure triggered by movement of the cutter pick into a mine face actuates the control valve and connects the nozzles to the high-press line.

Abstract: Track sections are attachedto the working face side of a face conveyor to form a track for a mining machine. The track sections have a rolled profile forming an L-shaped cross section with upright limbs pivotally interconnected at their ends by projecting sections of coupling plates facing the mine face to receive a chain link. A bead projects toward the mine face on the top of the upright limb to prevent collisions between the mining machine and the parts for pivotally interconnectng the track sections. The bead overlies the major part of an inclined surface of a transition section extending from the upright limb to a thickened lateral limb projecting toward the mine face for supporting the mining machine.