Group control means for hydraulic mine-roof supports

Details Group control means for hydraulic mine-roof supports Group control means for hydraulic mine-roof supports

1989-01-19

1990-01-09

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Ground stabilization or reinforcement

405291, 299 11, E21D 1544

Patent

active

048924466

ABSTRACT:
An electro-hydraulic control system for self-advancing mine-roof supports in a high-output longwall mine is used to form a sequence zone behind the mining machine whereby individual supports simultaneously operate in the sequence of prop drawing, advancing and setting so that, during the sequence, the roof in the sequence zone is supported by at least each second support with the length of the sequence phase so depending on the cutting speed of the mining machine that it increases with increasing speed to ensure that the roof exposed by the mining machine is supported without delay.

REFERENCES:
patent: 3507122 (1970-04-01), Schmidt
patent: 4050256 (1977-09-01), Phillips et al.
patent: 4134270 (1979-01-01), Small et al.
patent: 4378027 (1983-03-01), Weirich et al.
patent: 4379662 (1983-04-01), Block
patent: 4679856 (1987-07-01), Lubojatsky et al.
patent: 4708394 (1987-11-01), Trox et al.

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