System for monitoring the operation of a cage moving in a mine s

Details System for monitoring the operation of a cage moving in a mine s System for monitoring the operation of a cage moving in a mine s

1990-10-25

1991-12-10

Pellinen, A. D.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

187134, B66B 128

Patent

active

050709674

ABSTRACT:
A pulse encoder digitally derives a first value of speed at which the cage is moving at any given time. An analog device, such as a tachogenerator, derives the second value of the speed, in analog form, at which the cage is moving at the same time. The two speeds are compared in a comparator to determine the differences therebetween. If the difference exceeds a predetermined limit, an emergency stop is tripped to arrest the motion of the cage.

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"Automated Hoists Britain, Post-Markham", by Roger Davies, published in World Mining Equipment, Mar. 1989, pp. 29-36.
ABB Drives, "Microcomputer Based Hoist Monitor British Coal", Harworth No. 1 (1989) pp. 1 to 13.

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