Self-adaptive hydraulic rock drill

Details Self-adaptive hydraulic rock drill Self-adaptive hydraulic rock drill

1975-06-18

1977-05-17

Purser, Ernest R.

Tool driving or impacting

Automatic control of power operated means

Tool advance causing or controlling means

173 12, E21C 320

Patent

active

040236269

ABSTRACT:
A hydraulic drill, more particularly a rock drill, having a self-adaptive servo control system comprising three separate but interdependent hydraulic circuits, one for operating and controlling the drill rotation motor, one for controlling and operating the drill impact unit and a third for operating and controlling the drill feed motor. Control valves are disposed in each hydraulic circuit and are automatically operated such that when the pressure in the rotation motor circuit increases beyond a predetermined limit, the pressure in the impact unit circuit is decreased so as to decrease the power of the impact unit, and when the pressure in the rotation motor circuit decreases below a predetermined limit, the pressure in the impact unit circuit is decreased so as to decrease the power of the impact unit, and also comprising a differential pressure valve in the feed motor circuit which controls the operation of the feed motor such that when the impact power is decreased, the feed is also decreased, and vice versa.

REFERENCES:
patent: 3186103 (1965-06-01), Attebo et al.
patent: 3561542 (1971-02-01), Hanson et al.
patent: 3670826 (1972-06-01), Hanson et al.
patent: 3822752 (1974-07-01), Montabert
patent: 3823784 (1974-07-01), Feucht

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