| 摘要 |
FIELD: machine building.SUBSTANCE: invention relates to hammering devices. Hammering apparatus functioning with a pressurised medium, such as a pressure fluid of a hydraulic system, comprising an elongated body (19) attached to a power tool, a movable impact mass (10) for resting on body (19), equipped with a linear control part and an arrangement for lifting up movable impact mass (10). Impact mass (10) comprises first cylinder (20) with spaces (6) and (4) of cylinder and piston cylinder (16) which can be moved therein by means of a pressure fluid and rod (1) of piston. In mechanism, rod (1) is attached to said mass (10) and further comprises a valve mechanism (15) having supply pressurised line (22) and non-pressurised return line (23). With valve mechanism (15), pressure of the hydraulic fluid can be directed through tube (14) into first space (6) of cylinder in first cylinder (20) to other side of piston (16) to lift mass (10) and form gas in space (4) under pressure. Said pressure in space (6) can be quickly decreased in direction of impact mass (10). During impact of mass (10), hydraulic fluid or a portion thereof, returning from space (6) of first cylinder of cylinder (20) can be directed into expanding space (2) within rod (1) of piston through valve mechanism (15), as a result of which harmful back pressure caused by hydraulic fluid, diverted from space (6) of cylinder is substantially reduced.EFFECT: rapid removal of hydraulic fluid from cylinder.6 cl, 2 dwg |
