Hydraulic roof support control system

Details Hydraulic roof support control system Hydraulic roof support control system

1978-05-24

1980-03-04

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Ground stabilization or reinforcement

91404, 405291, E21D 1544

Patent

active

041914988

ABSTRACT:
A hydraulic control system is provided for a roof support unit of an underground mining installation. The roof support unit is provided with a roof cap supported by hydraulic props. The control system comprises a valve for controlling the supply of pressurized hydraulic fluid to the props, and an actuator for closing the valve when the props have been retracted by a predetermined amount.

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patent: 3259024 (1966-07-01), Kibble et al.
patent: 3306050 (1967-02-01), Andrews et al.
patent: 3309880 (1967-03-01), Potts et al.
patent: 3530490 (1970-09-01), Ward et al.
patent: 3541926 (1970-11-01), Grebe
patent: 3821880 (1974-07-01), Weirich et al.
patent: 3967539 (1976-07-01), Williamson
patent: 4151978 (1979-05-01), Frei

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