| 摘要 |
<p>There is a release device on a substructure fitted with a sliding ski (36) supported on the prop structure, (34, 39-41) and a winch (25) supplying pressure for this, on the mineral excavating machine which can be applied to a sloping face (2) underground. This involves use of the machine's jib arm (12, 16) esp. of the telescopic type, and percussion hammer (21), as release device. The face may have a very steep slope.</p> |
