Hydraulic control system for a rock drill

Details Hydraulic control system for a rock drill Hydraulic control system for a rock drill

1983-05-05

1984-04-03

Mackey, Robert

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

173 9, B23Q 5033, E21C 516

Patent

active

044402368

ABSTRACT:
A rock drill having a hydraulic system for controlling striking, rotating and advancing movements of a drilling rod. The advancing or forward feeding conduit for a feed actuator is provided with a relief valve which is responsive to the pressure in the positive rotating conduit for a rotary actuator so that the pressure in the forward feeding conduit is relieved to weaken the advancing force when the load on the rotary actuator is increased. A further relief valve is also provided for relieving the pressure in the striker conduit to weaken the striking force.

REFERENCES:
patent: 3802514 (1974-04-01), Ein et al.
patent: 3823784 (1974-07-01), Feucht
patent: 4064950 (1977-12-01), Salmi et al.
patent: 4246973 (1981-01-01), Mayer
patent: 4356871 (1982-11-01), Fujikawa
patent: 4369848 (1983-01-01), Salmi et al.

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