HYDRAULIC CYLINDER CONTROL DEVICE OF CONSTRUCTION MACHINE

摘要

PROBLEM TO BE SOLVED: To secure constant operability regardless of variation of a load only by adding a minimum and inexpensive facility.

SOLUTION: A regeneration circuit 18 that returns one part of return oil discharged from an arm cylinder 8 in a hydraulic shovel is installed to this cylinder control device. A regeneration valve 19 whose opening degree is controlled by a controller 20 is installed to the regeneration circuit 18. An opening characteristic of the regeneration valve 19 is varied according to a load pressure, so as to keep an actuation speed of an arm cylinder 8 relative to an operation volume of a remote control valve 17 constant.

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