| 摘要 |
A percussive hammering assembly comprises a tool assembly (24, 25). The tool assembly (24, 25) is arranged to be oscillated in a direction (P) within a casing. An impact piston (27) is arranged slideably in a housing (28), together with a control valve (29) forming a hammer assembly. An optional rotation module (37) is connected to the tool assembly (24, 25) to index the tool head (24) in contact with material to be removed. A drive assembly comprises a hydraulic pump (35) and a drive means (36), supplying pressure to a closedloop hydraulic circuit. Constant liquid volume accumulators (30a, 30b) are arranged between a high pressure line (HP) and low pressure line (LP) within the closed-loop hydraulic circuit. A differential pressure compensator (38) is arranged between the LP line of the closed-loop hydraulic circuit and environmental pressure. The respective components are all accommodated within a liquidfilled casing. |
