| 摘要 |
<p>The device (1) has a rotary drive (10) for rotatably driving a tool threaded end (3) of a striking piston (22), and a pressure-controlled fluid-feeding device (50) variably controlling supply of hydraulic fluid i.e. oil, and pressure from a pressure source to pressure chambers (42, 44). One of the pressure chambers with a return stroke surface (24) is spacer-connected with another pressure source in the turning operational position for the tool threaded end. The latter pressure source operates the rotary drive, where the pressure sources are designed as hydraulic pumps. An independent claim is also included for a method for operating an impact drilling device.</p> |
