公开(公告)号：US4142449A

公开(公告)日：1979-03-06

申请号：US761017

申请日：1977-01-21

申请人： Manfred Koppers ,  Otto Dombrowski

发明人： Manfred Koppers ,  Otto Dombrowski

IPC分类号： E21D15/51 ,  E21D15/44 ,  F15B13/042

CPC分类号： E21D15/512

摘要： A hydraulic mine prop comprises a cylindrical top ram portion and a bottom ram portion which is telescopically engageable in said top ram portion and has an upper piston portion in sliding sealing engagement with the interior of said top ram portion. A ram head closes the top of said ram portion and a valve seat body is disposed between the ram head at a spaced location therefrom adjacent the top of the top ram portion and defines a vent space therebetween. The valve seat body also encloses a pressure space between itself and the piston and a passage is defined through the valve body within a valve seat portion thereof which communicates the pressure space to the vent space. The passage is closed by a spring-biased valve which may open against the biasing force of the spring. The construction includes one or more passages extending through the valve seat and through various generally radially extending passages defined in the body from the pressure space to the vent space and additional passages which are defined outwardly from the vent space to the atmosphere. The construction also includes a ring around the top ram portion having an annular passage which is communicatable through a port or bore of the top ram portion cylinder to a pressure holding valve space which is closable by a rotatable globe valve.

摘要翻译： 液压矿井支柱包括圆柱形顶部活塞部分和底部活塞部分，其可伸缩地接合在所述顶部活塞部分中，并且具有与所述顶部活塞部分的内部滑动密封接合的上部活塞部分。 冲压头封闭所述冲头部分的顶部，并且阀座主体设置在冲头头部之间的间隔位置处，邻近顶部压头部分的顶部并且在其之间限定通气空间。 阀座体还包围其本身与活塞之间的压力空间，并且在其阀座部分内通过阀体限定通道，该阀座部分将压力空间连通至通气空间。 通过弹簧偏压的阀门关闭通道，该阀门可以抵抗弹簧的偏压力而打开。 该结构包括一个或多个通道，其延伸穿过阀座并且通过限定在主体中的从压力空间到通气空间的各种大致径向延伸的通道以及从通气空间向大气限定的附加通道。 该结构还包括围绕顶部压头部分的环，其具有环形通道，该环形通道可通过顶部活塞部分气缸的端口或孔连通到可由可旋转球阀闭合的压力保持阀空间。