Optimization Design of an Electrical Closed-Loop Control System for Gate Hoist Travel Limit
闸门启闭行程限位电气闭环控制系统优化设计

摘要

闸门启闭设备在高水头、长行程、频繁启停及潮湿振动环境下运行，传统单一机械限位控制容易受到触点粘连、 凸轮松动、线路断线和惯性越程等因素影响，难以同时满足位置精度、动作可靠性与故障可诊断性要求。本文依据液 压式启闭机、水电工程启闭机设计及机械电气安全相关标准，分析行程限位控制系统的信号链与典型失效模式，提出 由绝对位置检测、工作限位、终端极限限位和液压压力反馈组成的多源冗余闭环架构，并从PLC逻辑、减速控制、联 锁切断、失电保持及人机界面诊断等方面进行优化。在此基础上，建立“位置比较—速度修正—终端校验—异常切断 —状态追溯”的控制流程，给出关键参数整定与验收方法。研究表明，行程限位优化的核心不在于增加单个开关，而 在于形成检测、判断、执行和反馈相互校核的闭环，使一般限位故障能够被及时识别并由独立保护链切断危险动作， 为水闸、船闸和泵站启闭设备的电气改造与运行维护提供技术参考。

Abstract

 Gate hoist equipment operates under conditions of high water head, long travel distance, frequent start-stop operation, humidity, and vibration. Traditional single mechanical limit control is easily affected by contact adhesion, cam loosening, circuit disconnection, inertial overtravel, and other factors, making it difficult to meet the requirements of positioning accuracy, action reliability, and fault diagnosability at the same time. Based on relevant standards for hydraulic hoists, hydropower engineering hoist design, and mechanical and electrical safety, this paper analyzes the signal chain and typical failure modes of travel limit control systems, and proposes a multi-source redundant closed-loop architecture composed of absolute position detection, working limit, terminal extreme limit, and hydraulic pressure feedback. The system is optimized in terms of PLC logic, deceleration control, interlock cut-off, power-loss holding, and human-machine interface diagnosis. On this basis, a control process of “position comparison—speed correction—terminal verification—abnormal cut-off—state tracing” is established, and key parameter setting and acceptance methods are provided. The study shows that the core of travel limit optimization lies not in adding a single switch, but in forming a closed loop in which detection, judgment, execution, and feedback verify one another, so that general limit faults can be identified in time and dangerous actions can be cut off by an independent protection chain. This study provides technical reference for electrical renovation and operation and maintenance of hoist equipment in sluices, ship locks, and pumping stations.