基于PLC的曲轴运输线的设计

Design of Crankshaft Transport Line Based on PLC

摘要: 为适应现代制造业对自动化与柔性化生产的需求，本文设计并优化了一条基于可编程逻辑控制器(PLC)的曲轴自动化运输线。针对曲轴作为发动机核心精密部件，在转运过程中易碰伤、且生产节拍要求高的特点，本设计以西门子S7-1500系列PLC作为核心控制单元，结合传感器检测技术、变频器及伺服驱动技术，构建了完整的电气控制系统。通过模块化编程方法，在TIA Portal平台中完成了包括自动运行、手动调试、单机运行及急停保护在内的多种控制模式的程序设计，确保了系统运行的可靠性与灵活性。在优化方面，重点针对传统运输线超调量高的问题，采取了以下措施引入MPC控制算法，减少了整线换产时间以及避免因超调量发生的事故。其次，设计了安全互锁和故障诊断机制，通过实时监控气缸位置及传感器状态，实现了故障的快速定位与报警，极大提高了系统的平均无故障运行时间。最后，增设了人机界面(HMI)，为操作人员提供了直观的设备状态监控与参数设置平台。

Abstract: To meet the needs of modern manufacturing for automation and flexible production, this paper designs and optimizes a crankshaft automated transportation line based on a programmable logic controller (PLC). Considering that the crankshaft is a core precision component of the engine, which is prone to damage during transfer and requires a high production rhythm, this design uses the Siemens S7-1500 series PLC as the core control unit, combined with sensor detection technology, inverters, and servo drive technology to construct a complete electrical control system. Through a modular programming approach, various control mode programs—including automatic operation, manual debugging, single-machine operation, and emergency stop protection—were completed on the TIA Portal platform, ensuring the reliability and flexibility of system operation. In terms of optimization, special attention was given to the issue of high overshoot in traditional transport lines, and the MPC control algorithm was introduced to reduce overall line changeover time and prevent accidents caused by overshoot. In addition, a safety interlock and fault diagnosis mechanism were designed, achieving rapid fault localization and alarm through real-time monitoring of cylinder positions and sensor status, greatly improving the system’s mean time between failures. Finally, a human-machine interface (HMI) was added to provide operators with an intuitive platform for monitoring equipment status and setting parameters.