| 摘要 |
PURPOSE: A regulator of a hydraulic circuit for a pile driver is provided to vary a flow rate regardless of an external operating pressure and enhance the efficiency by accurately controlling output and increasing its response speed. CONSTITUTION: In a regulator(100), the oil pressure of a hydraulic pump(4) is sequentially transferred to a hammer control valve(11), a spool valve(14) and a hydraulic cylinder to control the operating time for lifting a ram. The output current of the regulator(100) is varied by a controller(110), whereby pilot pressure applied to the hammer control valve(11) through a reduction valve(7) is controlled by a proportional control valve(120). That is, the operating time of the ram is surely controlled because the regulator(100) responds to the accurate setting value of the controller(110).
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