盾构主驱动液压系统为刀盘驱动提供动力。本文根据现场调试中遇到的某盾构主驱动泵零位偏移的故障案例,分析了主驱动泵液控变量控制原理,阐述了零位偏移产生的原因以及电气零点、液压零点、机械零点的判别方法和相应处理措施,对类似闭式泵的故障诊断与调试具有重要的借鉴意义和参考价值。 The shield-driven main drive hydraulics power the cutterhead drive. Based on the fault case of zero displacement of the main driving pump of a shield driven in on-site commissioning, this paper analyzes the control principle of the main drive pump’s liquid-controlled variable, expounds the reason of the zero offset and the causes of the electrical zero, hydraulic zero, Zero point of identification methods and the corresponding treatment measures for similar closed-loop pump fault diagnosis and debugging has important reference and reference value.