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本科毕业设计（论文）通过答辩

摘 要

本文介绍了一种基于PLC的矿井通风控制系统，以瓦斯浓度为主控参数，通过PLC控制变频器实现变频调速，调节通风电机转速实现最优控制，达到安全监控与节能的目的，可以有效地解决以前矿井通风控制负荷波动大、系统故障率高、能源浪费严重等一系列问题。同时，系统具有自动和手动两种控制方式，便于对系统进行维护，并能通过应用软件对矿井通风控制系统进行监控和远距离控制，提高效率，从而实现自动控制。

关键词：PLC，变频调速，自动控制

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PLC-based mine ventilation control system design

Abstract

This paper introduces a PLC-based control system of the mine ventilation, gas concentration of the control parameters, by PLC control achieving VVVF inverter and motor speed regulation of ventilation to achieve optimal control, achieve security monitoring and energy efficiency. It can be effectively addressed mine ventilation control load fluctuations, the system failure rate is high and the serious waste of energy and other issues. Meanwhile, both manual and automatic control system to facilitate maintenance of the system repair, Application software and pass on mine can be controlled by application software. Improve efficiency, so as to achieve automatic control.

Keywords: PLC, Speed Regulation by Frequency Variation, Automatic Control

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目 录

1 引言 ...................................................................................................................... 3 2 设计方案的拟定 .................................................................................................. 3 3 系统的结构及工作原理 ...................................................................................... 4 3.1 系统的结构 ................................................................................................. 4 3.2 系统的控制原理 ......................................................................................... 4 3.3 系统的运行方式 ......................................................................................... 5 3.4 变频调速原理 ............................................................................................. 6 3.5 PID调节原理介绍 ................................................................................... 7 4 提高通风机装臵综合效率 .................................................................................. 9 4.1 风机调速 ..................................................................................................... 9 4.2 调整轴流风机叶片安装角度 ................................................................... 10 4.3 更换电机 ................................................................................................... 10 4.4 采用“子母”风机 ................................................................................... 11 5 硬件的设计 ........................................................................................................ 11 5.1 PLC类型的选用 .................................................................................... 11 5.2 变频器类型的选用及接线方式 ............................................................... 12 5.3 瓦斯传感器的选择 ................................................................................... 12 5.4 压力传感器的选择 ................................................................................... 13 5.5 变送器的选择 ........................................................................................... 13 5.6 电机的选择 ............................................................................................... 14 5.6 电源的供电方式 ....................................................................................... 14 5.7 故障处理及保护功能 ............................................................................... 16 6 软件的实现 ........................................................................................................ 17 6.1 PLC的I/O分配 ..................................................................................... 17 6.2 PLC接线图 ............................................................................................ 18 6.3 程序控制流程图 ....................................................................................... 18 6.4 程序的调试、测试和监控 ....................................................................... 19 6.5 上位机联机调试 ....................................................................................... 20 6.6 软件操作应注意事项 ............................................................................... 21 7 结束语 ................................................................................................................ 21 谢辞 ........................................................................................................................ 22 参考文献 ................................................................................................................ 22 附录1 程序清单 ................................................................................................... 24

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