Apparatus for controlling the supply of high-pressure liquid to a cutter drum assembly
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United States of America Patent
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-
Jan 21, 1986
Grant Date -
N/A
app pub date -
Dec 9, 1983
filing date -
Dec 18, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
High-pressure liquid is controlled for delivery to nozzles disposed near cutting tools or on the periphery of a shearer drum for a longwall mining machine. The shearer drum includes a central shaft which is extended to project from a support arm for the drum containing drive gearing to rotate the drum. The shaft rotates in the same direction and speed as the drum. The extended end of the shaft is used to support a live seal by which high-pressure liquid is introduced to a central bore in the shaft. Between the live seal and the support arm for the drum, there is provided a casing that does not rotate with the shaft and includes sector recesses in the bore thereof to supply liquid to separate bores in the shaft for controlling the discharge of liquid from valves. The valves are separately controlled by the liquid pressure in the sector recesses so that only nozzles directed to the coal face receive the pressurized liquid.
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