基于PLC控制的桥式起重机的设计.pdf

基于 PLC 控制地桥式起重机地设计 开封大学 付志乾 指导老师 杨志邦 内容摘要： 本文研讨基于可编程序控制器（ PLC ）和变频器地桥式起重机控制系统地改进 .阐述了 交流桥式起重机在实际中地应用以及 PLC 在改造方案中地确定，亦涉及在改造过程中设备 地选型 .本文以西门子 S7-200 系列 PLC 为例，讲述了 PLC 在交流桥式起重机改造中地地控 制方案 .与传统控制方案相比，采用 PLC 控制地桥式起重机可以简化繁重地设备，使控制更 加安全可靠 .从经济效益与环境效益地角度分析，本设计虽然前期投入一部分资金用于购买 PLC 及变频器等设备，但是长期运行后地维修成本远低于原系统，并且节能可达 30%左右 . 设计中变频器通过 PLC 进行无触点控制，使设备运行更加准确，并且减轻了人员地劳动强 度，提高了工作效率 . 关键词：桥式起重机 变频器 PLC 控制系统 The Design of PLC-based Bridge Crane System Abstract: This textdiscussion the improved design of bridge crane control system based on PLC and frequency converter. Introduced the application of Bridge crane, the application of PLC in reconstructive transform and choosing the device. The text takes Siemens S7-200 PLC series as an example, introduced the control project of Bridge crane system. Compared withtraditional control scheme，PLC-based Bridge Crane can Simplify the heavy equipment ， and make control more safety and reliable. Analysis from economic benefits and environmental benefits, The maintenance cost is far below original system after long-term operation ，and Saves about 30% of energy ， beside a fond musts put into buying PLC and inverter and other equipment . In this design, Inverter non-contact programmable controller controls the equipment to run more accurate, as well as reduced labor strength, increased efficiency. Key words: bridge crane 。 frequency converter 。 PLC 。 control system 目录 前言 1 1 设计要求及方案选择 1 1.1 系统设计要求 1 1.2 题目分析 2 1.3 系统方案选择 2 2 系统硬件设计 4 2.1 PLC 实现地主令控制器 4 2.2 限位器及安保电路 5