| 摘要 |
In this fluid pressure hammering device, which automatically switches/controls the stroke of a piston in accordance with the rock quality of a rock to be pulverized, control accuracy is increased. A strike-switching pilot hole (40) for removing high-pressure oil during hammering is provided to a reversal chamber (5). By means of a fluid ejection valve (41) that operates by incurring the hydraulic pressure from the stroke-switching pilot hole (40), oil is successively collected in a fluid chamber (32) provided to a stroke switching valve (30), and when the amount of oil in the fluid chamber (32) exceeds a baseline amount, short strokes are switched to long strokes by means of the switching of the stroke switching valve (30). |
