| 摘要 |
PURPOSE:To drop soil adhered to a bucket by vibrating the bucket by reciprocally moving a bucket cylinder at the stroke end of the bucket cylinder only when contraction signal is sent out. CONSTITUTION:In controlling the hydraulic circuit of an excavator in which soil adhered to a bucket is dropped by generating fine vibration at the stroke end of the bucket cylinder 10, a pilot pressure switch direction control valve 11 is provided between the excavating cylinder 10 of bucket and a hydraulic pump 16, and a direction switching solenoid valve 14 and a proportional control valve 15 is provided to the pilot paths 12 and 13. Under the condition that a reciprocally movable control switch 27 is closed, a contraction signal for the bucket cylinder 10 is sent out, and when stroke end signal is sent out of a stroke end sensor 35, the solenoid valve 14 is switched in a short period and the cylinder 10 is reciprocally moved. |
