Slow turning drum for a miner
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United States of America Patent
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Dec 17, 2013
Grant Date -
Apr 4, 2013
app pub date -
Nov 10, 2011
filing date -
Sep 30, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
Methods and systems for turning a cutting drum of a mining machine at a maintenance speed. One mining machine includes a cutting drum with a plurality of bits mounted on the drum and a cutting drum turning mechanism. The cutting drum turning mechanism includes a power source, a cutter motor, a switch, and a variable frequency drive. The state has a first and a second state. The first state electrically couples the power source and the cutter motor to operate the cutting drum at a cutting, and the second state electrically couples the variable frequency drive and the cutter motor to operate the cutting drum at a maintenance speed less than the cutting speed.
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