Apparatus for automatically shifting the conveyor at the pit fac

Details Apparatus for automatically shifting the conveyor at the pit fac Apparatus for automatically shifting the conveyor at the pit fac

1977-04-05

1978-07-11

Purser, Ernest R.

Mining or in situ disintegration of hard material

Automatic control; signaling or indicating

Of hard material disintegrating machine

E21C 3508

Patent

active

040997812

ABSTRACT:
Apparatus employed at the long-walled pit face in the coal mine so as to shift the conveyor toward the pit face wherein the conveyor which is arranged in front of the pit face and on which the shearer travels, is divided into several individual portions, and responding to signals transmitted from a position sensor arranged in each portion of the conveyor, a position signal generator attached to the shearer and a stroke sensor attached to one of hydraulic cylinders belonging to each portion on the conveyor, a group of electromagnetic valves for rendering operative the hydraulic cylinders which belong to that portion of the conveyor to be shifted are controlled so as to shift automatically when required only the corresponding portion of the conveyor.

REFERENCES:
patent: 3320001 (1967-05-01), Allen et al.
patent: 3489460 (1970-01-01), Cooper
patent: 3826535 (1974-07-01), Fujimori et al.

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