粮食水分在线检测控制系统

介绍了一种用于颗粒状粮食水分在线检测控制系统。该系统将圆柱型结构的粮食水分检测传感器置于干燥设备的出口、入口处，粮食水分变化导致传感器电容量变化，经过精密的信号采集、转换与处理，完成粮食水分的在线实时检测。该传感器还借助微处理器对测量信号的非线性与温度漂移进行了数字化的修正和补偿。反馈信号输出控制变频器，从而实现控制排粮机构运行转速。根据需要，该系统可以增加打印干燥机的多个工作参量，实现对料位及热风温度的控制等辅助功能以及自动报警功能。  Online Moisture Test System for Grain

Cao Yundong1,Lin Guodong1,2,Zhang Yang2

(1.College of Electrician Engineering ,Shenyang University of Technology,Shenyang 110023,China;2.Shenyang Academy of Instrumentation Science ,Shenyang 110043,China)

Abstract：Introduces an online moisture test system for grain. The cylindrical moisture sensors are put at the entry and outlet of the drying device. When the capacitance of moisture sensor changes aroused by grain moisture change, and the changing signals are collected, transformed and conditioned, the system accomplishes its online real-time task of measurement. The moisture sensor makes digital modulation and compensation on signal non-linearity and temperature offset by adoption of microprocessor. The feedback signals are used to control frequency transformer and subsequently control the rotate speed of grain discharging device. As per requirements, the system can print many variables to realize the control function for level and temperature and alarming function.

Key Words：Control System；Grain Moisture；Online Test；Dryness