微型土压平衡盾构机液压系统故障分析

Fault Analysis of Hydraulic System of Micro EPB Shield Machine

以微型土压平衡(Earth Pressure Balance,EPB)盾构机推进液压系统作为研究对象,介绍了推进系统的工作原理,对混入空气后的油液黏度和有效体积弹性模量进行分析,建立了推进系统数学模型,并对混入不同百分比空气的系统进行仿真运算,得到了液压缸位移响应和速度响应随系统含气量变化的关系。研究表明:随着液压系统空气含量的增加,液压缸位移响应发生迟滞,速度响应变慢,液压缸在运动时产生振动。结合各液压元件工作原理,依次对实际盾构机推进系统元件进行排气,最终排除了液压系统中混入的空气,为实现盾构机平稳推进提供了理论依据。

Taking the propulsion hydraulic system of micro earth pressure balance shield machine as the research object,the working principle of the propulsion system is introduced.The oil viscosity and effective bulk modulus of elasticity after mixing with air are analyzed.The mathematical model of the propulsion system is established,the displacement response and speed of the hydraulic cylinder are obtained by simulating the system mixed with different percentage of air response varies with the gas content of the system.The results show that:with the increase of air content in the hydraulic system,the displacement response of the hydraulic cylinder is delayed,the speed response becomes slow,and the hydraulic cylinder vibrates when it moves.Combined with the working principle of each hydraulic component,exhaust the components of the actual shield machine propulsion system in turn,and finally eliminate the air mixed in the hydraulic system,which provides a theoretical basis for the smooth propulsion of the shield machine.