| 摘要 |
<p>A drill bit (6) for percussion rock drilling including: - an impact portion (26) with an impact surface (9) for striking against rock in an impact direction (R), - an engagement portion (27) with: i) holder means (10) for holding the drill bit axially in a drill head of a drill string, and ii) rotation engagement means (11) for connecting the drill bit with the drill head for the purpose of rotation of the drill bit (6), - an anvil surface (14) being directed opposite to the impact direction for receiving shock waves from a striker rod (15) of the drill string, and - flushing channel means for transfer of flushing fluid to the impact surface (9). The holder means (10) and the anvil surface (14) are inside a holder recess (17) having an opening that is directed opposite to the impact direction (R). The invention also concerns a drill string component, a system and a method.</p> |
