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A device for measuring roof convergence in mechanized coal mine workings/tunnels/caverns
A device for measuring roof convergence in mechanized coal mine workings/tunnels/caverns
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机译：一种用于测量机械化煤矿工作/隧道/洞室顶板收敛性的装置
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摘要
This invention relates to a device for measuring convergence of the roof in a mechanized or semi mechanized coal mine workings, quickly and accurately as well as provides a visual warning when roof convergence reaches to a pre determined cut off value. This invention relates to a simple device which is easy to install and capable of maintaining alignment as per requirement. It provides accurate measuring and easy reading and is capable of indicating the convergence quickly as well as providing visual warning. This invention eliminates the requirement of a reference point in the floor of a roadway whose position is liable to be disturbed due to movement of heavy machines in a mechanized or semi mechanized coal mine district and also gives convergence of the roof irrespective of the position of the roof bed from where it is separated.
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