Hydraulic and earth engineering – Earth treatment or control – Ground stabilization or reinforcement
Patent
1978-12-12
1981-01-27
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Ground stabilization or reinforcement
91170MP, E21D 2316
Patent
active
042472261
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.
REFERENCES:
patent: 3246576 (1966-04-01), Kibble et al.
patent: 3606758 (1971-09-01), Gotze
Dettmers Michael
Weirich Walter
Corbin David H.
Gewerkschaft Eisenhutte Westfalia
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