电液提升装置能量回收系统设计及分析

Design and analysis of energy recovery system for electric hydraulic lift device

电动叉车普遍存在作业范围小、能量利用率低的问题,提出了一种新型电动叉车提升装置,具有自由提升区和第2提升区两个升降机构.通过分析能量回收系统工作原理,推导了各元件的数学模型及节能率模型,设计能量回收系统,研究了不同下降速度和有效载荷下两个提升区节能率,并在Matlab/Simulink中建立了能量回收微分方程模型,对比仿真和实测结果.结果表明:自由升力区的节能率从0%~49.5%不等,而第2提升区的节能率在23.6%~67.2%之间,说明系统最大节能效果发生在第2提升区;不同下降速度和有效载荷对两个提升区节能影响较大,合理设置下降速度和有效载荷能够实现最大节能效果.因此,所提的能量回收方法是可行的.

Electric forklifts generally have low operating range and low energy utilization.In this paper,a new type of lifting device for electric forklift truck is proposed,which has two lifting mechanisms,the free lifting zone and the second lifting zone.The energy recovery system is designed,the working principle of the energy recovery system is analyzed,the mathematical model of each component and the energy saving rate model are deduced,and the differential equation model of energy recovery is established in Matlab/Simulink.The results show that the energy-saving rate varies from 0% to 49.5% in the free lift zone,and the energy-saving rate ranges from 23.6% to 67.2% in the second hoisting zone.The maximum energy-saving effect of the system occurs in the second hoisting zone.Different falling speed and effective load have a great influence on the energy saving of two lifting zones,and reasonable setting of falling speed and effective load can achieve the maximum energy saving effect.Therefore,the energy recovery method presented in this paper is feasible.