发明授权
US3881557A Immersed ram hydraulic hammer 失效
沉浸式液压锤

Immersed ram hydraulic hammer
摘要:
A hydraulic hammer having a ram reciprocally moveable in a casing filled with hydraulic fluid. An axial bore in the ram maintains the end of the casing in open fluid communication. An anvil is impacted within the casing by the ram and high energy forces are transmitted out via a stem of the anvil.
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