| 摘要 |
<p>The mechanism (5) has a pneumatic chamber (19) formed between exciter and flying pistons (12,13). A drive moves the exciter piston such that the flying piston is excited to periodic movement between a hammer surface (27) and the exciter piston. A preset equation relating a mass of the flying piston, a cross-sectional surface and a maximum length (L) of the chamber, a stroke of the exciter piston, a collision factor, ambient pressure and isentropic coefficient of the gas in the chamber is fulfilled, when the mechanism exhibits a preset hammer frequency during a hammer operation.</p> |
