Fluid circuit null for work cylinder of engineering works

摘要

PURPOSE: To securely vibrate the cylinder at a high frequency with a simple structure circuit a bucket (work) cylinder furnished to a hydraulic shovel or the like. ;CONSTITUTION: When a high pressure fluid is supplied to the head side chamber 38a of a bucket cylinder 20, a control valve 124 is changed over to a vibration position S, then the high pressure fluid is supplied alternately to a head, rod side chambers 38a, 38b by means of a changeover means 53, and high frequency vibration is conducted in the state of a piston 39 being moved (bucket being turned to a digging up side) to a projecting side. Hereupon, because of bucket vibration, the bucket cylinder 20 of conventional provision is used without providing a special cylinder so that the structure becomes simple.;COPYRIGHT: (C)1995,JPO