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US 4,247,226 AGranted
Hydraulic conduit systems for mine installations
AssigneeGewerkschaft Eisenhutte Westfalia
InventorsWalter Weirich, Michael Dettmers
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AssigneeGewerkschaft Eisenhutte Westfalia
InventorsWalter Weirich, Michael Dettmers
Estimating the term…
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.
In a mineral winning installation, an improved hydraulic conduit system comprising:
A mineral mining installation comprising roof support units with hydraulically-operated telescopic props arranged in a mine working, a mineral winning machine, a guide for guiding the machine for movement back and forth along a mineral face, shifting rams disposed between the guide and the support units, control means for selectively operating the rams and the props of the units and a hydraulic fluid supply conduit system comprising a first pressure fluid feed conduit, a second pressure fluid feed conduit, a pressure fluid return conduit providing a common fluid return path for both the first and second pressure conduits, said conduits extending along said working and being connected to said control means to feed fluid to and from the selected props and rams and means, including a pump, arranged in a heading or gallery at one end of the working for delivering pressure fluid at a substantially constant delivery quantity to the first and second conduits to establish a higher pressure in the first conduit in the range 300 to 400 bars and a lower pressure in the second conduit in the range 100 to 200 bars, wherein:
Dependencies are inferred from the claim text.