Hydraulic control system for working machine

A technology for hydraulic control systems and working machines, which can be applied to fluid pressure actuation system components, mechanical equipment, earth movers/shovels, etc., and can solve problems such as wasted energy loss
CN101438064AInactive Publication Date: 2009-05-20CATEPILLAR SARL
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Patent Information

Authority / Receiving Office
CN Ā· China
Current Assignee / Owner
CATEPILLAR SARL
Publication Date
2009-05-20
Estimated Expiration
Not applicable Ā· inactive patent

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Abstract

A hydraulic control system for a working machine, where potential energy of a working section that vertically moves is reliably recovered and reused and where an inconvenience such as reduction in the speed of the working section is avoided in reuse of the recovered potential energy. The hydraulic control system has a first main pump (9) for drawing oil from an oil tank (11) and discharging it, an accumulator for accumulating under pressure the oil discharged from a head side oil chamber (8a) of a boom cylinder (8) when the working section is lowered; and a hybrid pump (32) for drawing the oil accumulated under pressure in the accumulator. The hydraulic control system is constructed such that, when the a boom is lifted, oil discharged from the hybrid pump (32) is supplied to the head side oil chamber (8a) and, when the supply flow rate from the hybrid pump (32) is insufficient, the deficiency is supplied to the head side oil chamber (8a) from the first main pump (9).
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Description

technical field

[0001] The present invention belongs to the technical field of a hydraulic control system in a working machine that can recover and reuse potential energy of a working unit that has a working unit that moves up and down. Background technique

[0002] Generally, work machines such as hydraulic excavators and cranes have a work unit that can be raised and lowered, and the work unit is raised and lowered based on the expansion and contraction of a hydraulic cylinder that is supplied with pressure oil from a hydraulic pump. When the working part is lowered, the oil discharged from the weight holding side oil chamber of the hydraulic cylinder to the oil tank is throttled by the control valve installed on the control valve that controls the oil supply and discharge of the hydraulic cylinder in order to prevent the sudden drop caused by the own weight of the working part. orifice for meter-out control. That is, the working part located above the ground has potentia...

Claims

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