Control system for longwall face support frames

Details Control system for longwall face support frames Control system for longwall face support frames

1991-06-18

1993-01-26

Look, Edward K.

Motors: expansible chamber type

Relatively movable working members with one having motive...

91459, 91518, 91447, 417303, 417442, 60427, F01B 100, F01B 700

Patent

active

051814510

ABSTRACT:
A control system for longwall face support frames as used in mines, the system comprising pushing rams which are adapted to be actuated at two different pressures (for example, a low pressure of about 70 to 120 bar for non-defined cutting and a high pressure of 120 to 350 bar for defined cutting) with each pushing ram being individually actuatable by a respective non-return valve arrangement, the pushing rams being connected by a common pressure line to an hydraulic pressure unit.

REFERENCES:
patent: 4473324 (1984-09-01), Cook
patent: 4485724 (1984-12-01), Demircan et al.
patent: 4622803 (1986-11-01), Lech
patent: 4718329 (1988-01-01), Nakajima et al.
patent: 5040367 (1991-08-01), Kauss

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