Mineral mining installation

Patent · Tue Jan 24 04:00:00 EST 1984

OSTI ID:6843263

Weirich, W

A longwall mineral mining installation has a conveyor and a plurality of roof support units positioned side-by-side on the goaf side of the conveyor. Each roof support unit has a roof shield having an advanceable shield extension. Each unit has a first hydraulic ram for extending its shield extension, and a second hydraulic ram for advancing the conveyor. The extension of each first ram is controlled in dependence upon the retraction of one of the second rams (either the second ram of the same unit or that of an adjacent unit). This control is effected by controlling the supply of pressurized hydraulic fluid to the first rams. In one embodiment this is carried out by a control valve which has a springloaded plunger which engages with a series of equispaced cams on the movable cylinder of the associated second ram. In another embodiment, the piston rods of the rams are provided with series of equispaced magnets. The cylinders of the rams are provided with sensors, which sense the magnets and generate control signals. A control box is provided to direct the control signals to control valves associated with the rams, so that the first rams are extended by the same distance as that through which the second rams are retracted.

• Assignee: Gewerkschaft Eisenhutte Westfalia (Germany, Federal Republic of)
• Patent Number(s): US 4427321
• OSTI ID: 6843263
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
012000* -- Coal
Lignite
& Peat-- Mining
CONTROL EQUIPMENT
CONTROL SYSTEMS
CONVEYORS
DESIGN
EQUIPMENT
FLOW REGULATORS
FLUIDS
HAULAGE EQUIPMENT
LONGWALL MINING
MATERIALS HANDLING EQUIPMENT
MECHANICAL STRUCTURES
MINE ROADWAYS
MINING
MINING EQUIPMENT
POSITIONING
POWERED SUPPORTS
PUMPS
ROOFS
SHIELDS
SUPPORTS
TUNNELS
UNDERGROUND FACILITIES
UNDERGROUND MINING
VALVES
WORKING FLUIDS