OPERATING METHOD AND APPARATUS FOR OUTRIGGER IN MOVABLE CRANE

摘要

PURPOSE:To make the road face reaction of an outrigger symmetric on both sides by mutually connecting outrigger oil cylinders respectively on the head side and the rod side during the setting operation of the outrigger and intercepting these connections after the operation is finished. CONSTITUTION:Each oil cylinder 8-11 is connected to the discharge port of an oil pump 13 via each change-over valve 14-17 on the head side and the rod side, and constructed to be extended, contracted, or stopped by the operation of each change- over valve 14-17. Among these oil pressure circuits, left and right oil cylinders 10 and 11 on the rear side are connected with each other respectively on the head side and the rod side via conduct pipe lines 20 and 21, on which switching valves 22 and 23 are provided.