Electro-hydraulic control systems

Details Electro-hydraulic control systems Electro-hydraulic control systems

1988-05-09

1990-03-06

Corbin, David H.

Hydraulic and earth engineering

Earth treatment or control

Ground stabilization or reinforcement

91170MP, 405299, E21D 2318

Patent

active

049061437

ABSTRACT:
An electro-hydraulic control system has a valve unit allocated to a roof support (support shield, support trestle or the like) and equipped with electromagnetic valves. The unit is controlled by a control unit via a cable which includes two current supply leads serving as a common current supply for all the electromagnetic valves and at least one data bus through which an actuator connected with the valve unit is actuated from a microprocessor of the control unit. The actuator itself consists preferably of a shift register through which all the electromagnetic valves can be actuated.

REFERENCES:
patent: 4050256 (1977-09-01), Phillips et al.
patent: 4089182 (1978-05-01), Takahashi et al.
patent: 4451181 (1984-05-01), Trumper et al.
patent: 4518285 (1985-05-01), Weber et al.
patent: 4692067 (1987-09-01), Ward et al.

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