Control systems and arrangements for use in mineral mining insta

Details Control systems and arrangements for use in mineral mining insta Control systems and arrangements for use in mineral mining insta

1975-11-17

1977-09-06

Schwadron, Martin P.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Activation of one path disables second path

91 36, 91414, 91448, 13762411, F15B 1304

Patent

active

040460584

ABSTRACT:
In a mineral mining installation employing a series of shifting rams for advancing a scraper-chain conveyor provided with a guide for a mining machine a control system with a central control station for transmitting control signals. The control signals serve to actuate local control valves, possibly in time dependence, to cause a selected one or group of metering devices to transfer a pre-determined volume of pressure fluid to one or more of the rams to effect said advancement. This volume of pressure fluid is some fraction of the total capacity of the ram or rams in question so that by repeatedly transmitting control signals the device or devices can perform successive cycles of operation to thereby cause the ram or rams associated therewith to extend in defined increments.

REFERENCES:
patent: 3045435 (1962-07-01), Weaver
patent: 3352322 (1967-11-01), Strick
patent: 3382769 (1968-05-01), Raider
patent: 3552266 (1971-01-01), Tanenblatt
patent: 3605554 (1971-09-01), Philbrick
patent: 3625004 (1971-12-01), Holzbock
patent: 3900090 (1975-08-01), Kobelt
patent: 3926217 (1975-12-01), Ohishi
patent: 3941031 (1976-03-01), Haddenhorst

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