| 摘要 |
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.
|
