公开(公告)号：US3991578A

公开(公告)日：1976-11-16

申请号：US560723

申请日：1975-03-21

申请人： John Cooke ,  Derek Alker

发明人： John Cooke ,  Derek Alker

IPC分类号： E21D23/16 ,  E21D15/58 ,  E21D23/26 ,  E21D15/44 ,  F15B21/02

CPC分类号： E21D15/585 ,  E21D23/26

摘要： A control means, for a mine roof support having hydraulically extensible prop means and some other pressure-fluid-operated component (e.g. a hydraulic ram for advancing the support), comprises a control valve having selectable positions in one of which (the prop extend position) it will select for a supply of hydraulic pressure-fluid to said prop means. The control means also include a valve device having a position in which it will provide for a supply of pressure-fluid to the prop means and having means adapted to cause it to move to that position, when the control valve is operated to the prop extend position, and to keep it in that position even position. the control valve is operated from the prop extend positon. By this arrangement a pressure-fluid supply to the prop means will still be maintained so as to ensure proper setting thereof and to make up any leakage of fluid. The operation of the control valve from the prop extend position may be, for example, to bring it into a neutral position or to a position in which pressure-fluid is supplied to the advancing ram of the support.In one preferred embodiment of the invention the valve device has a pressure-fluid responsive movable member and is adapted to be connected, for its operation, to a pressure-fluid supply via the control valve.

摘要翻译： 对于具有液压可伸长支撑装置和一些其它压力流体操作部件（例如，用于推进支撑件的液压柱塞）的矿山屋顶支撑件的控制装置包括控制阀，该控制阀具有可选择的位置，其中一个（支撑延伸位置 ）将选择供应液压压力流体到所述支承装置。 控制装置还包括一个阀门装置，该阀装置具有一个位置，在该位置中，它将提供压力流体供给支承装置并具有适于使其移动到该位置的装置，当控制阀被操作到支柱延伸 的位置，并保持在这个位置即使位置。 控制阀从支柱延伸位置操作。 通过这种布置，仍然保持对支柱装置的压力流体供应，以确保其适当的设定并弥补流体的任何泄漏。 控制阀从支柱延伸位置的操作可以是例如使其进入中间位置或将压力流体供应到支撑件的推进柱塞的位置。