An electrical balanced oil cylinder potential energy recovery system

Abstract

The invention discloses an electrical type balance oil cylinder potential energy recycling system. On the basis of an original movable arm drive system, a balance oil cylinder, a double-direction hydraulic pump / motor and an electric motor / electric generator are additionally arranged, conversion storage is achieved through the hydraulic pump, the electric motor / electric generator and a power battery, gravitational potential energy of a movable arm device is converted into electric energy to be stored, or the electric energy is converted into hydraulic energy to drive the movable arm to ascend, through control over the rotating speed of the electric motor / electric generator, releasing of electric energy can be controlled, the ascending speed of the movable arm can be controlled, and the defect that in hydraulic energy storage, the releasing process of energy stored in a hydraulic energy accumulator is not controlled is overcome. The electrical type balance oil cylinder potential energy recycling system is suitable for a hydraulic excavator, on the basis of not changing the operation structure of an original power system, gravitational potential energy of the movable arm is stored and released, energy is saved, and the very high economic value is achieved.

Description

Technical field [0001] The invention relates to a potential energy recovery system, in particular to an electric balance oil cylinder potential energy recovery system suitable for hydraulic excavators. Background technique [0002] Energy saving and environmental protection are the basic requirements of global economic development for energy installations. Hydraulic excavators, as a wide range of engineering machinery, play an important role in urban construction, mining, road construction, etc. However, the high energy consumption of hydraulic excavators has also aroused the attention of researchers, and has carried out corresponding research on it. At present, the potential energy recovery of hydraulic excavating arm is mainly divided into two types: electric and hydraulic. The electric potential energy recovery and reuse is realized by converting the rodless cavity of the driving cylinder into electric energy through the hydraulic motor-generator, and the lowering speed of t...

AI Technical Summary

Problems solved by technology

However, the direct recovery and regeneration of hydraulic accumulators has the following disadvantages: 1) energy can only be stored when the external pressure is higher than the internal pressure of the hydraulic accumulator, and regeneration can only be performed when the internal pressure of the accumulator is higher than its external pressure. And the energy storage and discharge process cannot affect the operating characteristics of the actuator; 2) During the recovery process, the pressure of the hydraulic accumulator will gradually increase, which will cause the pressure difference at both ends of the actuator speed control valve to change, which will inevitably affect The controllability of the actuator; 3) The pressure required by the boom actuator in the drive mode is generally greater than the pressure required in the recovery mode, and the pressure of the hydraulic accumulator is difficult to release directly

Therefore, when energy is recovered from the boom with a balance unit, the hydraulic accumulator is generally used as the energy storage unit, which inevitably has the above-mentioned shortcomings after using the accumulator

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