FIELD: machine building.
SUBSTANCE: hydraulic actuator can be used as control actuator for soil pressing with tunnelling shield during mining operations. It includes at least three hydraulic cylinders with feedback sensors, which are connected by means of flexible pipelines, hydraulic control unit, electric control unit, electro-hydraulic pressure control and pump station. Optimum pressure control is performed owing to electric signal that is shaped in electric control unit due to the signals from excess pressure converters from each hydraulic cylinder; at that, signal is supplied to electro-hydraulic pressure control that maintains optimum pressure in delivery line of hydraulic actuator.
EFFECT: enhanced reliability.
1 dwg
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