Method for the controlled maintaining of a distance between the top canopy and the coal face in longwall mining operations
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United States of America Patent
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Oct 29, 2013
Grant Date -
Dec 23, 2010
app pub date -
Feb 19, 2008
filing date -
Feb 19, 2008
priority date (Note) -
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Abstract
A method for maintaining, in a controlled manner, a top canopy/coal-face distance expedient for rock mechanics, in longwall mining operations in underground coal mining, using a face conveyor, at least one extraction machine, and a hydraulic shield support frame. Inclination sensors are disposed on at least three of the four main components of the shield support frame, including floor skid, gob shield, support connection rods and gob-side area of the top canopy. An inclination of the top canopy and floor skid are ascertained via the sensors. From the ascertained inclination data, in a computer, the effects on a top canopy/coal face distance are determined when changes in an angle of inclination of the top canopy occur. An automatic adjustment of decisive cycle parameters of the shield support frame are carried out, wherein the work cycle comprises retraction, advancement and setting processes.
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