中国铁道科学2012，Vol.33Issue(5)：47-53,7.DOI:10.3969/j.issn.1001-4632.2012.05.08
清筛机挖掘链闭式液压系统低压侧压力对系统输出特性的影响
Effect on the System Output Characteristics by the Low Pressure of Excavating Chain Closed Hydraulic System of Ballast Cleaning Machine
摘要
Abstract
In the solution of the motor damage problems of excavating chain hydraulic system of a certain type of domestic ballast cleaning machine, based on the closed hydraulic system structure and considering the pressure changes of low pressure side, characteristic qualitative analysis model of the closed hydraulic system output characteristics was established and the load changes of the motor were analyzed. The analysis was verified by simulation and tests. The results show that the low pressure of closed hydraulic system changes with the load of the motor, while the low pressure fluctuations can amplify the high pressure and flow turbulence, which makes the motor cavity piston rings under the load of high frequency and high amplitude and makes them break in very short time. According to the variable mechanism requirements of the pump and motor, the low pressure should at least meet the requirements for the maximum variable of the pump or motor. For load fluctuation condition, the short of flow and pressure of the low pressure side should be considered when load is at its maximum, and the flow match of oil supply pump, flushing valve and the system should be determined reasonably. For the closed hydraulic system with higher requirements, independent constant voltage source should be used to provide control oil to the variable mechanism. The setting pressure of the overflow valve by the oil supply pump should be no less than 2 Mpa, and the low pressure can be maintained a constant by connecting a 10 mL ? R-1 oil supply pump to the low pressure side.关键词
清筛机/马达/闭式液压系统/驱动系统/油路压力Key words
Ballast cleaning machine/ Motor/ Closed hydraulic system/ Driving system/ Oil-way pressure分类
交通工程引用本文复制引用
胡军科,周创辉,刘鑫..清筛机挖掘链闭式液压系统低压侧压力对系统输出特性的影响[J].中国铁道科学,2012,33(5):47-53,7.基金项目
铁道部科技研究开发计划项目(2010G008-D) （2010G008-D）
