Methods and apparatus for maintaining longwall face alignment

Details Methods and apparatus for maintaining longwall face alignment Methods and apparatus for maintaining longwall face alignment

1990-02-26

1991-06-04

Britts, Ramon S.

Mining or in situ disintegration of hard material

Automatic control; signaling or indicating

Of hard material disintegrating machine

342126, 364420, 364560, F21D 2314, G01B 700

Patent

active

050208608

ABSTRACT:
Mine panel alignment is controlled by recording the electromagnetic phase modulation and/or signal attenuation between spaced distant transceivers in the panel and a transceiver on a cutting machine to measure the distance between the transceivers. Through trilateration, the position of the cutting machine with respect to the known fixed locations can be determined and adjustments made to the cutting machine functions to maintain desired panel alignment.

REFERENCES:
patent: 3303499 (1967-02-01), Mahoney et al.
patent: 3853185 (1974-12-01), Dahl et al.
patent: 4234924 (1980-11-01), LaVance et al.
patent: 4912643 (1990-03-01), Beirxe

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