| 摘要 |
PROBLEM TO BE SOLVED: To avoid complication of the piping of an oil supply and discharge line of a hydraulic cylinder driving a chuck of attachment detaching equipment of a hydraulic type shovel excavator and thereby to lower the cost for the piping. SOLUTION: Attachment detaching equipment A has a detaching equipment main body having an expansible and contractible chuck, a chuck driving cylinder S3, a cancel-side supply and discharge line L4 which is branched from a rod-contraction-side main supply and discharge line L2 of an attachment driving cylinder S2 and connected to an oil supply and discharge port on the rod contraction side of the chuck driving cylinder S3 and which is switchable to open and close, a fixing-side supply and discharge line L3 which is branched from a rod-extension-side main supply and discharge line L1 and connected to the oil supply and discharge port on the rod extension side of the chuck driving cylinder S3 and which is switchable to open and close, a solenoid operated valve V2 for switching the oil supply and discharge line of the attachment driving cylinder S2 to open and close and a pilot controlled check valve V4 provided on the fixing-side supply and discharge line L3.
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