摘要
针对工程机械铲刀平地作业铲刀与地面的刚性冲击问题,提出一种工程机械平地作业液压浮动系统,通过增加阀芯行程在铲刀联主控阀芯上增加浮动工作位,详细阐述了液压浮动系统工作原理,基于AMESim搭建负载敏感控制的铲刀液压浮动系统仿真模型,进行了仿真参数设置,模拟了铲刀平地越障浮动升降过程,得到了铲刀油缸压力和位移动态曲线,并基于平地越障铲刀油缸易产生震动问题,在铲刀油缸大腔增加蓄能器进行减震,铲刀相同负载工况下进行了浮动升降仿真,研究结果表明:铲刀浮动平地作业越障易抬起铲刀,有效提升铲刀寿命;蓄能器对铲刀油缸平地越障的震动具有很多的吸能减震作用;铲刀油缸大腔冲击压力降低31%,活塞冲击速度降低42%。
Aiming at the problem of the rigid impact between the construction machinery leveling blade and the ground,a hydraulic floating system for the construction machinery leveling operation is proposed.Add a floating position on the blade linkage main control valve core by increasing the spool stroke.The working principle of hydraulic floating system is described in detail.The simulation model of the blade load sensitive control hydraulic floating system is built based on AMESim.The simulation parameters are set.The floating lifting process of the blade across obstacles on flat ground is simulated.The dynamic curves of the blade cylinder pressure and displacement are obtained.And aiming at the blade cylinder vibration problem in crossing obstacles on the flat ground,an accumulator in the blade cylinder large cavity is add to absorb shock.The blade floating lifting simulation is carried out under the same load condition.The results show that:the blade is easy to lift when the blade crossing obstacles,improving the the blade service life effectively;the accumulator has a lot of energy absorption and damping effects on the blade cylinder vibration when crossing obstacles;the impact pressure in the blade cylinder large chamber decreases by 31%,and the piston impact speed decreases by 42%.
作者
张丽
黄续芳
罗骁
文仁兴
李旭东
ZHANG Li;HUANG Xu-fang;LUO Xiao;WEN Ren-xing;LI Xu-dong(College of Mechanical Engineering,Sichuan Vocational College of Chemical Technology,Luzhou,Sichuan 646099;Sichuan Bangli Heavy Machinery Co.,Ltd.,Luzhou,Sichuan 646099)
出处
《液压与气动》
北大核心
2023年第9期182-188,共7页
Chinese Hydraulics & Pneumatics
基金
智能制造泸州市重点实验室开放基金课题(ZZ202002)。
关键词
平地作业
铲刀
液压浮动
蓄能器
减震
leveling ground operation
blade
hydraulic floating
accumulator
absorb shock
