Remote control system for mining machines

Details Remote control system for mining machines Remote control system for mining machines

E - Fixed Constructions

21

C

262/81

E21C 35/24 (2006.01)

Patent

CA 1095939

REMOTE CONTROL SYSTEM FOR MINING MACHINES Abstract of the Disclosure 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 differen- tial 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. File 5623-A-2 G. G. Dower -1-

336220

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