| 摘要 |
<p>A rock drill having a tunnel profile control system comprises a boom assembly, a converting unit for converting the position of one of various positioning points on an orthogonal coordinate system representative of the transverse section of a tunnel to be driven, into a respective value on a boom coordinate system. A positioning control positions the boom assembly according to a value from the converter unit, and an ultrasonic distance measuring instrument mounted on the boom assembly determines the distance between the positioning point and a point on the peripheral wall defining the tunnel. An arithmetic unit utilizes the distance measured between the positioning point and the point on the peripheral wall defining the tunnel, the direction of travel of the ultrasonic waves, and the value of the positioning point, to calculate, in terms of the value in the orthogonal coordinate system, the value of a measuring point on the transverse section of the tunnel. The arrangement achieves easy and exact measurement of the profile of the tunnel being driven.</p> |
