| 摘要 |
A hydraulic drill hammer with a ram (2a) supported in a spring-loaded manner in the percussion direction relative to the drill rod (15) is driven via reduction gearing (7) with eccentric (12) and connecting rod (6), a liquid jet (25) being deflected as power source via a turbine wheel (20) which is connected to gearing (7). With its residual kinetic energy, the liquid jet (25) then entrains air in a collecting nozzle (26) according to the injector principle and after passing through the narrowest cross-section (27) is decelerated in order to increase pressure. Of the liquid-air mixture developed, a portion is fed as flushing and cooling liquid through the hollow drill rod to the drill bit, while another portion is sprayed for cooling the surrounding rock. The rotary movement for the drill chuck (16) is produced by the gearing (7) via a separate output (13). …<IMAGE>… |
