采用蓄能器的大负载液压缸制动系统设计及其能量回收率仿真分析

为有效减缓大负载液压缸制动阶段产生的冲击影响,并且有效减少能量损耗,采用液压蓄能器构建重力势能回收系统,通过AMESim仿真平台对动态制动过程和能量回收率进行分析。研究结果表明:在前0.5 s大负载液压缸处于匀速运动,后续系统进入制动并开始回收能量;从1.4 s开始,系统出现泄漏,蓄能器无法继续回收能量,需要利用切断阀将制动回路切断;在切断阀最初产生制动效果时,回油路流量已处于很低的状态,因此缓冲腔并不会受到较大冲击;不同的蓄能器体积并不会引起系统制动状态的变化,可达到基本相同的能量回收率。提高蓄能器初始压力后,在更短时间内可完成制动过程,并且回收的能量基本不变。

Design and Energy Recovery Simulation Analysis of Hydraulic Cylinder Braking System with Large Load Using Accumulator

In order to effectively mitigate the impact of hydraulic cylinder braking and effectively reduce the energy loss, a hydraulic accumulator was used to build a gravitational potential energy recovery system. The dynamic braking process and energy recovery were analyzed by using AMESim simulation platform.The results show that: in the first 0.5 s, hydraulic cylinder is in uniform motion, subsequently the system enters the braking process and begins to recover energy;starting from 1.4 s, the system is leaking, and the accumulator cannot continue to recover energy, so the brake circuit needs to be cut off by the cut off valve;when the cutting valve initially produces the braking effect, the return oil flow is already in a very low state, so the buffer chamber will not be greatly impacted;under different accumulator volumes, the braking state of the system does not change, and the energy recovery is basically the same;after increasing the initial pressure of the accumulator, the braking process can be completed in less time and the energy recovered is lower.