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1、本科毕业设计本科毕业设计( (论文论文) )题目：基于题目：基于 PLCPLC 程控输煤系统的设计与控制程控输煤系统的设计与控制本科毕业设计本科毕业设计( (论文论文) )题目：基于题目：基于 PLCPLC 程控输煤系统的设计与控制程控输煤系统的设计与控制基于基于 PLCPLC 程控输煤系统的设计与控制程控输煤系统的设计与控制摘摘 要要火力发电厂燃煤输送系统是保证电厂锅炉安全可靠运行的十分重要的支持系统， 主要负责对发电机组燃煤的卸载、储存和上煤。如何保证设备运行的可靠性、减少操 作人员与维护人员劳动强度、提高经济效益，成为一个值得研究的课题。 可编程逻辑 控制器（PLC）是近年来发展极为迅速
2、，应用面极广，以微处理器为核心，集微机技术、 自动化技术、通信技术于一体的通用工业控制装置。它具有功能齐全、使用方便、维 护容易、通用性强、可靠性高、性能价格比高等优点，已在工业控制的各个领域得到 了极为广泛的应用，成为实现工业自动化的一种强有力工具。 本文基于西门子公司的S7-200型PLC，设计了程控输煤系统。各设备之间均实现了 安全联锁保护控制功能：系统中的输煤电机启停是有着严格的控制顺序。起动时，为 了避免在前段运输皮带上因煤料堆积而造成事故，系统要求逆煤料的流动方向按一定 时间间隔顺序起动。停止时为了不使运输皮带上因残留煤料而造成事故，系统要求顺煤料流动方向按一定时间间隔顺序停止。P
3、LC控制系统硬件设计布局合理，工作可靠， 操作、维护方便，工作良好。用 PLC程控输煤程控系统，不但实现了设备运行的自动 化管理和监控，提高了系统的可靠性和安全性，而且改善了工作环境，提高了企业经 济效益和工作效率。因此PLC程控输煤系统具有一定的工程应用和推广价值。关键词关键词：锅炉；输煤系统；皮带运输机；可编程逻辑控制器；梯形图；锅炉；输煤系统；皮带运输机；可编程逻辑控制器；梯形图；Based On PLC,Program-controlled Coal Conveying SystemAbstractThermal power plant coal conveying system is
4、 the guarantee of safe and reliable operation of the power plant boiler is very important support system, is mainly responsible for generating sets of coal unloading, storage and coal. How to ensure the reliability of equipment operation, reduce the operating and maintenance personnel the labor stre
5、ngth, improve the economic benefit, has become a topic worth studying. Programmable logic controller (PLC) is developing very rapidly in recent years, a wide application, microprocessor as the core, integrating microcomputer technology, automation technology and communication technology in the integ
6、ration of general industrial control device. It has complete functions, convenient use, easy maintenance, strong commonality, high reliability, high ratio of performance to price, has been in the areas of industrial control is widely used and become a powerful tool to realize industrial automation.
7、This article is based on Siemens S7-200 PLC, program-controlled coal conveying system is designed. Between various devices are realized safety interlock protection control function: the coal conveying system motor start-stop is fairly strict control sequence. When starting, in order to avoid in fron
8、t transport belt accident caused by the accumulation of coal material, system requirements inverse coal material flow direction in a certain time interval starting sequence. Stops in order not to make the transport belt accident, caused by residual coal feeding system requirements along the coal flo
9、w direction in a certain time interval sequence stops. PLC control system hardware design layout is reasonable, reliable work, convenient operation and maintenance, good work. With PLC program-controlled coal SPC system, not only has realized the automation of the equipment operation management and
10、monitoring, to improve the reliability and security of the system, and improve the working environment, improve the enterprise economic benefit and work efficiency. So the PLC program-controlled coal conveying system has a certain value for engineering application and promotion.Key Words: Boiler；Coa
11、l conveying system；Belt conveyor；Programmable logic controller；Ladder diagram；目目 录录中文摘中文摘要要（I） 英文摘要英文摘要 （II）1 1 绪论绪论 .1 11.1 课题背景 .11.2 设计任务 .21.3 本文主要研究内容 .21.4 本文研究的目的及意义 .32 2 可编程逻辑控制器可编程逻辑控制器 PLCPLC 概况概况 .4 42.1plc 的概念及发展.42.1.1 可编程序控制器的历史.42.2 可编程序控制器的硬件及工作原理 .52.2.1 可编程序控制器的基本结构 .52.2.2 可编程序控制器的物理结构 .63 3 系统的硬件设计系统的硬件设计 .7 73.1PLC 机型选择 .73.2 电动机的选型 .93.3 电机主电路图设计 .104 4 S7-200PLCS7-200PLC 及其开发环境介绍及其开发环境介绍.11114.1S7-200PLC 介绍 .114.2Microwin32 介绍 .155 5 系统的软件设计系统的软件设计 .2 22 25.1 系统软件控制 .225.2 程控输煤系统启动部分控制 .255.3 程控输煤系统停止部分控制 .265.4 程控输煤系统紧急停止和故障停止部分控制 .27- 5.4.1 紧急停止部分控制 .
