Hydraulic control for a longwall support

Details Hydraulic control for a longwall support Hydraulic control for a longwall support

2005-10-26

2008-12-02

Leslie, Michael (Department: 3745)

Motors: expansible chamber type

Relatively movable working members with one having motive...

C091S526000

Reexamination Certificate

active

07458307

ABSTRACT:
A hydraulic control for a longwall support with a plurality of face support frameworks (1-3), which are adapted to be actuated in the sense of longwall support functions, in particular in the sense of the longwall support operations: robbing, advancing, and setting, comprises hydraulic control valves (8, 9) for each of the biasing elements, which are each arranged in close spatial relationship with the biasing elements, and subdivided into groups. Each group connects to a hydraulic pressure line (16), which extends over the longwall length of a plurality of face support frameworks, via a group connection line (18), which can be blocked by a group stop valve (20) as a function of the actuation of the control valves, specifically, when all control valves are not actuated and all biasing elements of the group are in a static state.

REFERENCES:
patent: 4306822 (1981-12-01), Weirich et al.
patent: 4657443 (1987-04-01), Blumenthal
patent: 4679489 (1987-07-01), Jasinski et al.
patent: 6282893 (2001-09-01), Porter et al.
patent: WO 02/068798 (2002-09-01), None

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