Method and apparatus for controlling rock drilling
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United States of America Patent
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May 19, 2015
Grant Date -
Apr 26, 2012
app pub date -
May 28, 2010
filing date -
Jun 26, 2009
priority date (Note) -
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Abstract
Method and apparatus for controlling rock drilling with a percussion device belonging to a rock drill to deliver stress waves to rock through a tool by pushing the tool against the rock by means of a feed motor and rotating simultaneously the tool by means of a rotation motor, whereby the maximum feed force is determined, pressure medium is supplied to the feed motor and to the rotation motor and the feed force is controlled according to the drilling conditions. The feed force is controlled on the basis of the feed speed and the rotation torque. The apparatus has a load control valve which controls the feed.
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