| 摘要 |
<p>In underground mining, in particular in longwall face working, the working face is continuously monitored by the movements of the pushing-cylinder piston being converted into rotary movements and then being measured and recorded in a timed sequence. This not only renders the previous manual measuring activity of mine surveyors unnecessary, but at the same time the position of the face or of the face conveyor can be continuously monitored and regulated if required. Used for this purpose is a face-position measuring device, the piston rod of which is connected to the piston of a pushing cylinder acting on the face conveying means. The pushing cylinder in turn is to be connected to the counting mechanism by a cable, which can be wound onto a cable drum, via drivers and a lever linkage. By means of this measuring device, the movements in one direction performed by the piston of the pushing cylinder can be measured in such a way that even the smallest amounts are reliably recorded. It has been found that, over panel lengths of 200 m and more, measuring differences of only 20 cm and less occur, and this despite the fluctuation coming from the face conveyor when the winning machine passes through. <IMAGE></p> |
