发明名称 |
Actuator e.g. lift pad, operating apparatus for e.g. drill head, has actuator controlling earth working device, where working device is configured to advance along predefined drilling route |
摘要 |
<p>The apparatus has an actuator (1) e.g. lift pad, controlling an earth working device e.g. drill head. A valve assembly operates the actuator by utilizing pressure of a drilling fluid e.g. bentonite, where the valve assembly has a set of seat valves (3, 6, 8) actuated by a camshaft of the valve assembly. The working device is configured to advance along a predefined drilling route, and an expansion tool of the device corrects an advance of the earth working device. A drilling liquid pump (7) is switched on to build up the pressure in the actuator to raise the actuator. Independent claims are also included for the following: (1) a drilling or flushing medium for use in an operation of an actuator (2) a method for operating an actuator for controlling an earth working device.</p> |
申请公布号 |
DE102007016821(A1) |
申请公布日期 |
2007.10.11 |
申请号 |
DE20071016821 |
申请日期 |
2007.04.05 |
申请人 |
TRACTO-TECHNIK GMBH & CO. KG |
发明人 |
SCHAUERTE, MANFRED |
分类号 |
E21B7/08;E21B7/20;E21B10/26;E21B47/00 |
主分类号 |
E21B7/08 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|