Hydraulic conduit systems for mine installations

US4247226A · kind A · utility

Assignee

• Gewerkschaft Eisenhutte Westfalia GmbH · DE

Inventors

• Walter Weirich · Dortmund, DE
• Michael Dettmers · Kamen, DE

Key dates

• Filing date: Dec 12, 1978
• Grant date: Jan 27, 1981
• Expiry date: Dec 12, 1998

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E21F17/08
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

In a mine installation which employs a winning machine moved back and forth along a guide in a working and coupled via shifting rams to roof supports, the invention provides a hydraulic fluid supply conduit system for supplying the pressure fluid for operating the shifting rams and the props of the roof supports. The system employs a first conduit containing fluid at a pressure of 300 to 400 bars for setting the props of the roof supports, a second conduit containing fluid at a pressure of 100 to 200 bars for use as a robbing aid during retraction of the props, a third conduit containing fluid at a pressure of 100 to 200 bars for operating the shifting rams and a common fluid return conduit. The conduits are laid along the working and the first and the second or third conduits are fed by separate pumps in a heading or gallery while the third or second conduit is connected via a pressure-reducing valve to the pump feeding the first conduit. The cross-sections of the conduits are designed in a specific relationship defined hereinafter, to provide adequate pressure fluid flow while maintaining the desired pressure levels and minimizing back pressure.