| 摘要 |
Apparatus for mechanically breaking up rock comprises a hydraulically operated piston-cylinder assembly, a slider wedge connected to the piston rod of the assembly and presser cheeks mounted on a tubular extension of the cylinder of the assembly for engagement with opposite sides of the slider wedge. A web extending transversely within the outer end of the tubular extension has an elongate opening through which "T"-shaped heads of the presser cheeks can be inserted into the tubular extension so that, on rotation through 90 DEG about the longitudinal axes of the presser cheeks, the heads are locked behind the edges of the elongate opening but capable of lateral movement along the opening as a result of axial movement of the slider wedge. Preferably, the lateral extremities of the T-shaped heads are seated between two pairs of semicircular shaped supporting plates which are retained within the tubular extension by the transversely extending web. The presser cheeks are resiliently clamped to the slider wedge by a C-shaped retaining spring which is rotatable within the tubular extension for alignment of the gap with the elongate opening in the transverse web to allow removal of the heads of the presser cheeks. Alternatively, the presser cheeks are clamped by the cranked ends of spring-loaded pins which may be rotated so that the cranked ends clear the presser cheeks. |
