车间输煤机组控制系统设计毕业论文

目 录

第1章 引言 ··········································································错误！未定义书签。

1.1设计内容及要求 ····················································错误！未定义书签。 1.2输煤机系统简介 ··················································································2 1.3 PLC简介 ································································································3

第2章 PLC控制系统设计 ·······································································4

2.1硬件系统设计 ······················································································4

2.1.1控制系统主电路图设计 ······················································4 2.1.2电器元件的选择 ····································································5 2.2软件系统设计 ······················································································6

2.2.1 I/O地址分配表 ····································································6 2.2.2 PLC控制电路接线图 ···························································8 2.3梯形图 ····································································································8 2.4语句表 ·································································································· 25

设计总结 ················································································································· 30 谢辞 ···························································································································· 31 参考文献 ················································································································· 32

1

第1章 前言

1.1设计内容及要求

本课程设计任务主要是锅炉车间输煤机组系统的设计，有多个电动机带动，具体内容如下:

输煤机组控控制系统示意图如图1-1所示。

图1-1 输煤机组示控制系统意图

输煤机组的拖动系统由6台三相异步电动机M1～M6和一台磁选料器YA组成。SA1为手动/自动转换开关，SB1和SB2为自动开车/停车按钮，SB3为事故紧急停车按钮，SB4～SB9为6个控制按钮。HA为开车/停车时讯响器，提示在输煤机组附近的工作人员物煤机准备起动请注意安全。HL1～HL6为Ml～M6电动机运行指示，HL7为手动运行指示，HL8为紧急停车指示，HL9为系统运行正常指示，HL10为系统故障指示。 输煤机组控制要求如下

1、手动开车/停车功能 SA1手柄指向左45°时，接点SA1-1接通，通过SB4～SB9控制按钮，对输煤机组单台设备独立调试与维护使用，任何一台单机开车/停车时都有音响提示，保证检修和调试时人身和设备安全。

2、自动开车/停车功能 SA1手柄指向右45°时，接点SA1-2接通，输煤机组自动运行。

1) 正常开车 按下自动开车按钮SB1，音响提示5s后，电动机M6-M1逆序启动起动运行，并点亮指示灯HL6-HL1； 10s后，点亮HL9系统正常运行指示灯，输煤机组正常运行。

2) 正常停车 按下自动开车按钮SB2，音响提示5s后， 电动机M1-M6顺序停车 并熄灭HL1-HL6指示灯，同时，熄灭HL9系统正常运行指示灯； 并熄 输煤机组全部正常停车。

1

3) 过载保护 输煤机组有三相异步电动机M1～M6和磁选料器YA的过载保护装置热继电器，如果电动机、磁选料器在输煤生产中，发生过载故障需立即全线停车并发出报警指示。系统故障指示灯HL10点亮，HA电铃断续报警20s，HL10一直点亮直到事故处理完毕，继续正常开车，恢复生产。

4) 紧急停车 输煤机组正常生产过程中，可能会突发各种事件，因此需要设置紧急停车按钮，实现紧急停车防止事故扩大。紧急停车与正常停车不同，当按下红色蘑菇形紧急停车按钮SB3时，输煤机组立即全线停车，HA警报声持续10s停止，紧急停车指示灯HL8连续闪亮直到事故处理完毕，回复正常生产。

5) 系统正常运行指示 输煤机组中，拖动电动机M1～M6和磁选料器YA按照程序全部正常起动运行后，HL9指示灯点亮。如果有一台电动机或选料器未能正常起动运行，则视为故障，系统故障指示灯HL10点亮，输煤机组停车。

相关设备参数如下： (1) M1-M6及磁选料器YA。 (2) 指示灯HL：0.25W，DC24V。 (3) 电铃HA：8W，AC220V。

1.2 输煤系统简介

随着生产过程的控制规模不断增大，运行参数越来越高，生产设备及其相应的热力设备和系统更加复杂。输煤系统是热力系统的重要组成部分，是锅炉车间燃料供应的有力保证。输煤机组工作效率的提高是整个工艺过程的关键因素，而整个输煤过程往往采用远程控制，这就对自动控制系统的设计提出了更高的要求，传统方法不能得到满意的测控效果。因此，在输煤系统中往往选择比较有优势的PLC（可编程控制器）控制系统，使整个控制过程具有正常运行、事故处理、参数监测、故障报警、装置调控、危险保护等功能。

输煤系统的主要特点有：

1.系统设备多。设备种类多。给煤机、翻车机、斗轮堆取料机、皮带输送机、碎煤机、筛煤机、犁煤器、三通挡板、除尘器、取样机、煤味监测装置、皮带秤等。设备数量多。电厂输煤系统设备数量一般均为100多台。

2.系统分部广。输煤系统设备布设分散、作业线长、运行方式灵活多变， …… 此处隐藏：463字，全部文档内容请下载后查看。喜欢就下载吧 ……