Roof sensing control of shearer in longwall mining
First Claim
1. A mining method utilizing a mining apparatus having at least upper and lower cutting means, comprisingproviding a position detector on said mining apparatus, said detector being vertically moved in association with vertical movement of said lower cutting means,projecting signals from said position detector to measure distance from said position detector to a mine roof, andvertically adjusting the position of said lower cutting means in response to said signals of said position detector so that constant cutting height between the upper and lower cutting means can be obtained when the upper cutting means is adjusted to cut along a seam.
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Abstract
The present invention is directed to a method for regulating position of a mining apparatus comprising the steps of transmission of a plurality of signals from a position detection device, interception of said signals at an edge of a mine at a distance away from the position detection device, and adjustment of the position of the mining apparatus to form an intersection between at least two signals at the edge of the mine.
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Citations
3 Claims
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1. A mining method utilizing a mining apparatus having at least upper and lower cutting means, comprising
providing a position detector on said mining apparatus, said detector being vertically moved in association with vertical movement of said lower cutting means, projecting signals from said position detector to measure distance from said position detector to a mine roof, and vertically adjusting the position of said lower cutting means in response to said signals of said position detector so that constant cutting height between the upper and lower cutting means can be obtained when the upper cutting means is adjusted to cut along a seam.
Specification