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1. 发明授权

US5511626A Hydraulically operated subsoil displacement apparatus 失效
标题翻译：液压操作底土位移装置
公开(公告)号：US5511626A
公开(公告)日：1996-04-30
申请号：US370880
申请日：1995-01-10
申请人： Henrik Steen
发明人： Henrik Steen
IPC分类号： E21B4/14 , E21B7/26
CPC分类号： E21B4/14 , E21B7/26
摘要： A hydraulically operated mole has a reciprocating hammer operated by means of an impact mechanism which may be readjusted from forward to backward wiring by displacement of a valve tube secured to a piston near the rear end of the apparatus. The piston is activated by the switching of oil supply and withdrawal respectively to the tank between two pipeline stubs at the rear end of the apparatus. The fluid connections between the stubs and the piston are completely separated as regards the flow. As a result, complicated and vulnerable valve elements used in known hydraulic moles are avoided.
摘要翻译：液压操作的鼹鼠具有通过冲击机构操作的往复式锤，该冲击机构可以通过在装置的后端附近固定到活塞的阀管的位移从正向布线重新调整。活塞通过将供油和抽出分别切换到设备后端的两个管线柱之间的罐来激活。流道与管柱之间的流体连接完全分开。结果，避免了以已知液压摩尔数使用的复杂而脆弱的阀元件。

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