毕业设计（论文）-VD炉PLC控制系统设计.docVIP

VD炉PLC控制系统设计 摘 要 目前，真空脱气处理工艺作为炉外精炼的一种在冶金工业得到广泛使用其原理是利用对真空室进行抽真空在真空状态下对钢水进行脱气，降低钢水中的[H]、[N]。在大型现代化冶金生产中，VD钢包处理已成为现代二次冶金的基本手段。 The Design of Programmable Logic Controller Control System in Vacuum Furnace Abstract At present，the Vacuum Degassing (VD) process craft，as one kind of the stove outside fining，obtains the widespread use in the metallurgical industry. Its principle is using the vacuum chamber takes out the vacuum，degassing to the molten steel under the vacuum state, reduce the hydric and nitrogen of molten steel. In the large-scale modernized metallurgy production, VD ladle processing has become the essential method of modern two metallurgy. This process craft system realization including lower position machine control programme realization and on position machine supervisory system realization two parts. This topic main research is the design of vacuum degasification system lower position machine (PLC) the automatic control system , specifically includes the system general design, the electrical equipment composition design, the PLC control circuit, the input module, the output module design, compile the program, as well as with on position machine communicate. The lower position machine programming mainly completes the data acquisition, the transformation, the transmission duty as well as realizes each control loop functions and so on craft control, chain-like protection. Finally，carries on the communication with on position machine. Keywords: Programmable Logic Controller，Vacuum Degassing，control 目录 1 绪论 1 1.1课题背景与研究意义 1 1.2 国内外发展现状与应用情况 2 1.3 PLC技术概况 3 1.4 本文所作的工作 4 2 VD炉系统概况 5 2.1电气设备组成 5 2.2 电气系统分析 5 2.2.1 低压电源 5 2.2.2 液压传动 5 2.2.3 盖车传动 6 2.2.4 PLC控制 6 2.3 VD抽真空系统原理 7 2.3.1 VD处理工艺操作 7 2.3.2 抽真空原理 7 2.3.3 节约蒸汽和缩短抽气时间的实现 8 2.4 VD生产过程中的注意事项 9 3 可编程控制器（PLC）基本原理介绍 10 3.1可编程控制器的产生与发展 10 3.1.1可编程序控制器的产生 10 3.1.2 可编程控制器的发展与展望 11 3.2 可编程控制器的定义 13 3.3 可编程控制器的特点 14 3.4 PLC的工作原理 15 3.5 PLC的组成 17 3.6 可编程控制器的应用 20 3.7 PLC的编程语言 21 4 VD炉PLC控制系统的设计 23 4.1 PLC控制系统设计的原则及步