发明名称 |
CONTROL SYSTEM FOR LONGWALL FACE SUPPORT FRAMES |
摘要 |
A control system for longwall face support frames as used in mines, the system comprising pushing rams which are adapted to be actuated at two different pressures (for example, a low pressure of about 70 to 120 bar for non-defined cutting and a high pressure of 120 to 350 bar for defined cutting) with each pushing ram being individually actuatable by a respective non-return valve arrangement, the pushing rams being connected by a common pressure line to an hydraulic pressure unit.
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申请公布号 |
US5181451(A) |
申请公布日期 |
1993.01.26 |
申请号 |
US19910716924 |
申请日期 |
1991.06.18 |
申请人 |
HERMANN HEMSCHEIDT MASCHINENFABRIK GMBH & CO. |
发明人 |
GEUNS, GUY;REINELT, WERNER |
分类号 |
E21D23/16;E21D23/12;E21D23/18;E21D23/26 |
主分类号 |
E21D23/16 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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