| 摘要 |
The invention relates to a hammer drill that comprises a shank (9) connected to at least one drill rod (12) including a tool (13) to be brought into contact with a rock to be drilled (14), a guiding device (16) for the shank (9), and a fluid injection circuit adapted for supplying an injection fluid from a fluid supply duct (15) up to the tool (13) and the rock to be drilled (14) in order to extract, upon drilling, the rock debris out of the drilling hole, wherein the injection fluid is to be in contact with the guiding device and the shank. The hammer drill includes an anode (23) provided in the fluid injection circuit and in contact with the injection fluid, the anode being arranged so as to ensure a cathodic protection of the metal surfaces of the guiding device (16) and/or the shank (9) against a corrosive attack caused by the injection fluid. |
