Hydraulic control system for a rock drill

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

1980-10-06

1982-11-02

Kunin, Stephen G.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

173 11, 173 19, B23Q 500, E21C 516

Patent

active

043568718

ABSTRACT:
A rock drill having a hydraulic system for controlling a 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. A switching valve is provided between the advancing and retreating conduits for the feed actuator so that the direction of movement of the feed actuator is automatically changed when there is an abrupt decrease in the pressure in the striker conduit.

REFERENCES:
patent: 3561542 (1971-02-01), Hanson
patent: 3823784 (1974-07-01), Feucht
patent: 3979944 (1976-09-01), Salmi et al.
patent: 4074771 (1978-02-01), Morrison
patent: 4246973 (1981-01-01), Mayer

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