Importance

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Abstract

Problem to Be Solved: To investigate an opening area control of a flow control valve disposed on upstream side of the stick's direction change-over valve when using the flow control valve as a valve for restricting the supply flow rate to stick cylinder during interlocking operation of the swiveling motor and stick cylinder. Solution: A configuration is provided to control the opening area of the stick's first flow control valve based on a target supply flow rate to the stick cylinder, target differential pressure between first hydraulic pump A and supply pressure to the stick cylinder, and opening area of supply valve passage to the stick's direction change-over valve and also control that the differential pressure is set larger as operating amount of swiveling manipulator increases during interlocking operation of the swiveling motor and stick cylinder and the opening area of stick's first flow control valve is made smaller as the differential pressure increases.

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First Claim