毕业设计-VD炉PLC控制系统设计.doc

第 PAGE 1 页 共 64页 VD炉PLC控制系统设计 摘 要 目前，真空脱气（VD）处理工艺作为炉外精炼的一种，在冶金工业中得到广泛使用。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。该处理工艺系统控制的实现包括下位机控制程序的实现和上位机监控系统的实现两个部分。本课题主要研究的是真空脱气系统下位机（PLC）自动控制系统的设计，具体包括系统的总体设计，电气设备组成设计，PLC控制电路、输入模块、输出模块的设计，程序的编写，以及与上位机的通信。下位机程序编制主要完成数据采集、转换、传递任务以及实现各种工艺控制、连锁保护等控制回路功能。最后，与上位机进行通讯。 关键词：PLC,VD,控制 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 TOC \o 1-3 \h \z \u 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