Hydraulic control device and construction machine provided with same
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United States of America Patent
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Oct 17, 2017
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app pub date -
Dec 27, 2012
filing date -
Jan 11, 2012
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Abstract
A hydraulic control device that reduces the loss of the power of a pump in combined operation of boom lowering and arm pushing. A controller performs single control of increasing capacity of a first pump in accordance with increase in an operation amount of a boom operation member, in a single operation of the boom lowering. On the other hand, the controller restricts the capacity of the first pump compared to capacity in the single control, during a restriction control period when the combined operation of boom lowering and arm pushing is detected, and the operation amount of the boom operation member is a prescribed operation amount or more.
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