Mining or in situ disintegration of hard material – Automatic control; signaling or indicating – Of hard material disintegrating machine
Patent
1978-10-10
1980-03-11
Purser, Ernest R.
Mining or in situ disintegration of hard material
Automatic control; signaling or indicating
Of hard material disintegrating machine
91459, 299 30, E21C 3524
Patent
active
041925513
ABSTRACT:
An intrinsically safe system controls all miner hydraulic and electrical functions from a hand held miner remote control pendant. Pendant control devices provide on/off control signals to interfaces with miner drive and pump controllers, as well as a group of .+-.6 VDC differential proportional and on/off control signals to respective electronic valve drivers. Valve driver outputs are fed to respective force motors on pilot stage valves which control each hydraulic function. Each valve driver output is modified by offset and dither signals to overcome power stage valve dead band and frictional characteristics. Pilot stage valves have an internal feedback sleeve coacting with a pilot valve spool in a hydraulic servo circuit. Pilot stage valves operate in a pilot oil system which may be isolated from power oil systems.
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Cable & Wireless Remote Control of Continuous Miners, Mining Congress Journal, Oct., l974, pp. 34-39.
Remote Control for Continuous Miner, Coal Age, Aug. 1958, pp. 98-101.
Remote Control Mining & Cont. Roof Bolting, Mining Congress Journal, Sep. 1976.
Locks William S.
Miller Francis G.
Weimer James C.
Wilson Edwin B.
Bethlehem Steel Corporation
Delaney Michael J.
Dower George G.
O'Keefe Joseph J.
Purser Ernest R.
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