| 摘要 |
<p>The hydraulic hammer for stone drilling has its piston (12) controlled by a valve arrangement incorporated in the hammer housing (10). The hydraulic motor is in series with the piston, connected by a supply line (22) and both are connected to an external reversing valve (20) by a supply line (21) and return line (25) in parallel with it. The piston (12) is in series with a stop valve (24) only when driven forwards. In parallel with this is a second stop valve (26) which opens for the piston to be driven in the opposite direction. In parallel with the motor (17) is a throttle (28), in a by-pass line (27).</p> |
