公开(公告)号：US5000622A

公开(公告)日：1991-03-19

申请号：US439822

申请日：1989-11-21

申请人： Siegmar Block

发明人： Siegmar Block

IPC分类号： E21D23/06 ,  E21D23/22

CPC分类号： E21D23/22 ,  E21D23/063

摘要： A shaking control unit for a hydraulic cylinder, wherein a first predetermined pressure is admitted to the piston space of the cylinder through a first hydraulic line. A three/two-way valve connects in its zero position a second hydraulic line to a return tank, the second hydraulic line being connected to the first hydraulic line through a check valve. A first control line leads from the first hydraulic line to a first control area of the three/two-way valve. A second control line leads from the second hydraulic line to a second control area of the three/two-way valve. The three/two-way valve is constructed in such a way that, when the pressure in the first hydraulic line reaches a second predetermined pressure which is greater than the first predetermined pressure, the three/two-way valve switches and connects the first hydraulic line to the second hydraulic line. If the piston of the hydraulic cylinder meets an obstacle, the pressure in the first hydraulic line rises above a certain limit value. This pressure acts on the first control area of the valve and switches the valve, so that the high pressure of the first line becomes suddenly effective in the piston space through the valve and the second line. This pressure switches back the valve after a certain period of time over the second control line.

公开(公告)号：US3672174A

公开(公告)日：1972-06-27

申请号：US3672174D

申请日：1970-09-08

申请人： HANSJEACKIM VEN HIPPEL

发明人： HIPPEL HANSJEACKIM VEN

IPC分类号： E21D23/00 ,  E21D23/22 ,  E21D11/16

CPC分类号： E21D23/22 ,  E21D23/0017

摘要： A walking mine roof support wherein one or more roof engaging caps are pivotable on the upper end of at least one extendable pit prop which is mounted on the floor engaging base. Balancing rams connect the rear ends of the caps with the base or such rams carry bars which are movable against the roof behind the caps. The props and the rams are operated by a hydraulic control system in response to signals from pressure gauges mounted on the front and rear ends of the caps. Such signals indicate changes in pressure which the mine roof exerts against the respective ends of the caps.

摘要翻译： 一种行走的矿顶支撑件，其中一个或多个屋顶接合盖可在安装在地板接合基座上的至少一个可延伸的凹坑支撑的上端枢转。 平衡的公柱将盖子的后端与基座连接，或者这样的公柱带有可抵靠盖子后面的屋顶的杆。 道具和公柱由液压控制系统操作，以响应来自安装在盖的前端和后端的压力计的信号。 这种信号表示矿山屋顶对盖的相应端部施加的压力变化。

公开(公告)号：US4907918A

公开(公告)日：1990-03-13

申请号：US95562

申请日：1987-09-10

申请人： Siegmar Block

发明人： Siegmar Block

IPC分类号： E21D23/06 ,  E21D23/22

CPC分类号： E21D23/22 ,  E21D23/063

摘要： A shaking control unit for a hydraulic cylinder, wherein a first predetermined pressure is admitted to the piston space of the cylinder through a first hydraulic line. A three/two-way valve connects in its zero position a second hydraulic line to a return tank, the second hydraulic line being connected to the first hydraulic line through a check valve. A first control line leads from the first hydraulic line to a first control area of the three/two-way valve. A second control line leads from the second hydraulic line to a second control area of the three/two-way valve. The three/two-way valve is constructed in such a way that, when the pressure in the first hydraulic line reaches a second predetermined pressure which is greater than the first predetermined pressure, the three/two-way valve switches and connects the first hydraulic line to the second hydraulic line. If the piston of the hydraulic cylinder meets an obstacle, the pressure in the first hydraulic line rises above a certain limit value. This pressure acts on the first control area of the valve and switches the valve, so that the high pressure of the first line becomes suddenly effective in the piston space through the valve and the second line. This pressure switches back the valve after a certain period of time over the second control line.

摘要翻译： 一种用于液压缸的摇动控制单元，其中第一预定压力通过第一液压管路进入气缸的活塞空间。 三通/二通阀在零位置将第二液压管路连接到回油箱，第二液压管路通过止回阀连接到第一液压管路。 第一控制线从第一液压管路引导到三通阀的第一控制区域。 第二控制线从第二液压管路引导到三通阀的第二控制区域。 三通阀构造成使得当第一液压管路中的压力达到大于第一预定压力的第二预定压力时，三通/二通阀开关并连接第一液压 到第二条液压管线。 如果液压缸的活塞遇到障碍物，则第一液压管路中的压力升高到某一极限值以上。 该压力作用于阀的第一控制区域并切换阀门，使得第一管路的高压通过阀门和第二管路在活塞空间中突然起作用。 这个压力在第二条控制线上经过一定的时间后将阀门转回。

公开(公告)号：US4465408A

公开(公告)日：1984-08-14

申请号：US490529

申请日：1983-04-29

申请人： Karl Krieger ,  Gunter Kuschke ,  Werner Reinelt

发明人： Karl Krieger ,  Gunter Kuschke ,  Werner Reinelt

IPC分类号： E21D23/16 ,  E21D23/22 ,  E21D23/26

CPC分类号： E21D23/26 ,  E21D23/22

摘要： A control line connects an annular space in an auxiliary hydraulic cylinder of an hydraulically-movable mine-roof support (the auxiliary cylinder being provided to advance a forward, auxiliary, roof-support canopy in the direction of the working face of a mine) to the displacement space of an hydraulic measuring cylinder which is longitudinally displaceable in a direction parallel to the hydraulic advancing cylinder in order to advance the auxiliary roof-support canopy, which is pivoted to the main roof-support canopy, in synchronism with the advancing cylinder mounted in the base of the mine-roof support and attached to an abutment on the working face side of the support. A control valve is connected to the control line and responds to the control line pressure in such a way that, when the pressure falls, it supplies pressurized fluid into the pressure space of the auxiliary cylinder to extend the piston rod thereof, and shuts off again when the pressure increases. An axial bore in the piston rod of the advancing cylinder preferably serves as the measuring cylinder.

摘要翻译： 控制线连接液压可移动的矿顶支撑件的辅助液压缸中的环形空间（辅助缸被提供以在矿井的工作面的方向上向前推进，辅助的，顶部支撑的顶盖）到 液压量筒的位移空间，该液压量筒可在与液压前进缸平行的方向上纵向移动，以便与安装在行进气缸上的辅助车顶支撑罩一起转动，该辅助车顶支撑罩枢转到主车顶支撑罩 在矿顶支架的底部，并附着在支架的工作面一侧的支座上。 控制阀连接到控制线并响应于控制线压力，使得当压力下降时，其将加压流体供应到辅助气缸的压力空间中以使其活塞杆延伸并再次关闭 当压力增加时。 前进缸的活塞杆中的轴向孔优选用作量筒。