| 摘要 |
PCT No. PCT/FI94/00297 Sec. 371 Date Dec. 27, 1995 Sec. 102(e) Date Dec. 27, 1995 PCT Filed Jun. 29, 1994 PCT Pub. No. WO95/01496 PCT Pub. Date Jan. 12, 1995An arrangement for controlling the oscillation of a rock drilling equipment, comprising oscillation cylinders acting between a body and two crawlers, an oscillation selector valve allowing the oscillation cylinders to be interconnected. Locking valves are mounted in the oscillation cylinders, which valves prevent the flow of pressure fluid from the oscillation cylinders e.g., in the case of a hose damage, thus locking the crawlers and the body against movement relative to each other. |
