Rotary decelerating and braking energy recovery system of hydraulic excavator

A technology for braking energy recovery and hydraulic excavators, which is applied to earth movers/shovels, construction, etc., can solve the problem of increased engine load changes of excavators, affecting the operating habits and work efficiency of operators, and reducing engine output. minor issues
CN101736771AInactive Publication Date: 2010-06-16ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2010-06-16
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention discloses a rotary decelerating and braking energy recovery system of a hydraulic excavator, comprising two valve blocks. Each valve block is provided with a hydraulic control unloading valve, a hydraulic control conversion valve, a hydraulic control reversing valve and two one-way valves; in each valve block, the hydraulic control reversing valve is respectively communicated with a multi-way valve, the hydraulic control conversion valve, the hydraulic control unloading valve, the second one-way valve, a pilot oil path control handle and a rotary motor; the second one-way valve is communicated with a energy accumulator; the hydraulic control conversion valve and the hydraulic control unloading valve are communicated with the energy accumulator via the first one-way valve; the multi-way valve is respectively communicated with the hydraulic control conversion valve and the hydraulic control unloading valve via the first one-way valve; the hydraulic pump and the controller are connected with the second pressure sensor; and the energy accumulator and the controller are connected with the first pressure sensor. The invention enables the hydraulic excavator to automatically judge the motion state of the rotary system and recover the braking energy and enables the engine to work in the high-efficiency interval.
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Description

technical field

[0001] The invention is suitable for engineering machinery with a hydraulic slewing system, especially for hydraulic excavators with a hydraulic slewing system. Background technique

[0002] Hydraulic excavators are used in a wide range of applications and have a lot of energy loss. It is of great economic value to study the energy saving of hydraulic excavators. The traditional hydraulic excavator slewing system often achieves the braking effect through reverse back pressure when decelerating and braking. The kinetic energy of the slewing body is converted into the heat energy of the pressed oil, which is lost in vain, causing the hydraulic system to heat up, and various hydraulic systems such as cavitation Defects reduce the life of the hydraulic system. Since the slewing action is a very frequent action in the hydraulic excavator, the energy loss caused by it is very serious, and the recovery and reuse of the lost energy has very considerable economic ben...

Claims

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