| 摘要 |
A mobile and elevatable train is used in an underground mine to extend, or shorten, a roof-mounted conveyor system. A train is comprised of a plurality of cars, each of which has independent jacks adapted to raise, or lower, each car with respect to the roof. The plurality of cars is linked together by a mechanism which allows the cars to travel together, yet allows them to pivot with respect to another and also assume different elevations with respect to another. Each one of the plurality of cars carries at least one detachable roller structure which is elevated to the position it should have in the conveyor system, after the roof supports have been attached. Each car may also carry at least one permanently attached roller structure so that the mobile and elevatable train can temporary function as the support for a moving conveyor belt, prior to its next move. The mobile and elevatable train is equally adapted to either an advancing, or retreating, belt line.
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