Hydraulic and earth engineering – Earth treatment or control – Ground stabilization or reinforcement
Patent
1983-02-28
1985-05-21
Taylor, Dennis L.
Hydraulic and earth engineering
Earth treatment or control
Ground stabilization or reinforcement
91170MP, 91527, 299 33, E21D 2312, E21D 2316, F16B 1300
Patent
active
045182850
ABSTRACT:
A control system for longwall mining roof supports which are controlled in dependence on the position of the mining machine at any time. All of the roof supports are connected to a central computer via common conductors. Each of the roof supports includes a control unit having a code corresponding to the number of that support. This code serves as an address and enables the central computer to transmit its control command signals positively, in response to the mining machine position signals, through an appropriate address control unit for a particular roof support. In order to enable roof supports to be actuated manually also, the control units of all of the roof supports are connected to the central computer by two common conductors, one of which carries an automatic enable signal and the other of which carries a manual enable signal. The system is such that whenever automatic command signals are being transmitted by the computer, manual control cannot be effected; and when manual control signals are being employed, automatic control cannot be effected.
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Beckmann Wolfgang
Gebauer Hartmut
Weber Karl-Heinz
Gebr. Eickhoff Maschinenfabrik und Eisengiesserei mbH
Murray Thomas H.
Stodola Nancy J.
Taylor Dennis L.
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