机械毕业设计236PLC在矿井通风控制系统中的应用

论文题目：PLC在矿井通风控制系统中的应用

学生姓名：

所在院系： 机电学院

所学专业： 电气工程及其自动化

导师姓名：

完成时间：

摘 要

本系统将PLC与变频器有机地结合起来，采用以矿井气压压力和瓦斯浓度为主控参数，实现对电动机工作过程和运转速度的有效控制，使矿井通风机通风高效、安全，达到了明显的节能效果。且PLC控制系统具有对驱动风机的电机有过热保护、故障报警、机械故障报警和瓦斯浓度断电等功能特点，为煤矿矿井通风系统的节能技术改造提供一条新途径。与常规继电器实施的通风系统相比，PLC系统具有故障率低、可靠性高、接线简单、维护方便等诸多优点，PLC的控制功能使通风系统的自动化程度大大提高，减轻了岗位人员的劳动强度。

关键词：PLC，变频器，传感器，通风机组，压力检测

The Application of the Mine Ventilation System in Controller Based

on the PLC

Summary

The system PLC and inverter organically are combined with the pressure and the gas pressure in order to mine the concentration of controlling the parameters of the working process and operation of the motor speed control, so mine ventilation fan efficiency, safety, achieved significant energy savings. And the PLC control system on the drive fan motor with overheating protection, fault alarm, mechanical failure alarm and the concentration of power and other features of gas for coal mine ventilation system to provide a new way to energy transformation. Here to enter the need to translate words and general relay in the implementation of the ventilation system, the system has the plc failure rate low and high reliability, the simple, easy and with the advantage of the plc, the control function of the ventilation system of automation is greatly increased, the posts of staff labour intensity.

Keywords: PLC, Inverter, Sensors, Ventilation units, Pressure testing

目 录

1 引言 ............................................................................................................................ 1 2 系统结构和控制方案 ................................................................................................ 1 2.1 系统的设计功能 ................................................................................................. 1 2.2 系统组成及方案 ................................................................................................. 2 3 系统硬件构成及各部分功能 .................................................................................... 3 3.1 PLC可编程控制器部分 ...................................................................................... 3 3.1.1 PLC概述 ........................................................................................................ 3 3.1.2 PLC的一般构成和基本工作原理 ................................................................ 3 3.1.3 可编程控制器的工作方式 ........................................................................... 4 3.1.4 PLC选型及特点 ............................................................................................ 4 3.1.5 PLC内部分配 ................................................................................................ 5 3.1.6 CPU模块的外部连接 ................................................................................... 5 3.1.7 扩展模块的外部连接 ................................................................................... 5 3.2 传感器部分 ......................................................................................................... 8 3.3 变频器部分 ......................................................................................................... 9 3.3.1 变频器的基本构成 ....................................................................................... 9 3.3.2 变频器选型 ................................................................................................. 10 3.3.3 变频器与PLC的外部连接 ........................................................................ 10 3.4 通风机组部分 ....................................................................................................... 10 3.41 KXJT型矿用通风机结构 ............................................................................... 10 3.42 KXJT型矿用通风机技术参数 ....................................................................... 11 4 软件设计 .................................................................................................................. 11 4.1 温度控制部分 ................................................................................................... 12 4.2 瓦斯浓度控制部分 ........................................................................................... 14 4.3 压力控制部分 ................................................................................................... 15 5 结束语 ...................................................................................................................... 19 致谢 .............................................................................................................................. 19 参考文献 ...................................................................................................................... 19 附录(程序清单) ........................................................................................................... 21

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