Research On Design Of Energy-saving System Of Working Device Of Hydraulic Excavator

In this article, a combined energy-saving simulation platform of moveable armand rotary table has been established under the simulatioX environment by taking the20t excavator as an example. This platform can convert the potential energy generatedin the descending process of moveable arm into electric energy and store it into thesupercapacitor to be released by the time when the rotary table rotates for driving therotary table. Under the precondition of ensuring the optimum rotating speed androtational acceleration of the rotary table, the rotary table is divided into two kinds ofoperating modes in accordance with the state of charge (SOC) of the supercapacitor,namely, compound drive by the electric machine and hydraulic motor as well asindividual drive by the hydraulic motor. Strategy concerning conversion between thesetwo kinds of operating modes has been established consequently. Oil return flowfeedback control on the descending speed of the moveable arm has been taken to ensurea constant descending speed of the moveable arm, which further stops the conversion ofpotential energy to kinetic energy of the moveable arm, improves the energy recoveryrate and reduces the impact generated during moveable arm descending. The studyresults indicate that this system can save fuel oil by up to3.98%under the rotatingcondition of the rotary table within a standard cycle possessing certain energy savingeffect.