基于物联网的热泵式低温循环粮食烘干机监控系统研究

Design of Monitoring System for Heat Pump Grain Low Temperature Circulating Dryer Based on Internet of Things

摘要:

针对热泵式低温循环粮食烘干机监控手段落后、信息化程度低等问题，设计了基于物联网的热泵式低温循环烘干机监控系统。系统采用感知层、传输层和应用层相结合的体系架构，以可编程控制器（Programmable logic controller，PLC）和HMI触摸屏为核心，设计开发控制系统，实现对烘干机和热泵的实时监测、图形化显示、安全保护和自动化控制；采用Linux的CentOS系统开发服务端系统框架，通过EG8000mini模块将采集的数据接入AP基站并存储至数据库，使用户可以通过计算机端或手机APP对热泵式低温循环粮食烘干机进行远程实时监控。试验验证结果显示，系统通信成功率高于98%，对环境温度、热风温度、热风相对湿度及热风风速实时检测平均绝对误差分别为0.3℃、0.26℃、1.2%和0.47 m/s，可满足热泵式低温循环烘干机远程监控需求。

Abstract:

Aiming at the problems of backward monitoring means and low information level of heat pump low-temperature circulating food dryer, a monitor and control system of heat pump low-temperature circulating food dryer based on the Internet of things was designed and developed. The architecture design of the system used perception layer, transmission layer and application layer, and the system took programmable logic controller (PLC) and HMI touch screen as the core to design and develop a control system to realize real-time monitoring, graphical display, safety protection and automatic control of dryers and heat pumps. The server system framework was developed by Linux CentOS system. The data connected by EG8000mini module was sent to AP base station and stored in database. Users can remotely monitor and control the heat pump low temperature circulating food dryer through computer or mobile APP. The experimental results showed that the communication success rate of the system was higher than 98%, and the average absolute error of real-time detection of ambient temperature, hot air temperature, hot air humidity and hot air wind speed was 0.3℃, 0.26℃, 1.2% and 0.47 m/s, respectively, which can meet the remote monitor and control requirements of heat pump type low temperature circulation dryer.