华中农业大学学报2025，Vol.44Issue(2)：94-104,11.DOI:10.13300/j.cnki.hnlkxb.2025.02.010
基于电容法的溜管式颗粒物料质量流量计设计与试验
Design and experiment of a chute mass flowmeter of granular materials based on capacitance method
摘要
Abstract
A chute mass flowmeter of granular materials was designed based on capacitance method and according to the difference in dielectric properties between granular materials and air to achieve online automatic measurement of the mass flow rate of granular materials in the chute.The device was equipped with an STM32 microcontroller,a capacitance-to-digital Converter chip AD7746,and a plate conversion circuit with MT8816 as the core chip to build a data acquisition system,achieving effective acquisition of capacitance of eight-plate rotary excitation sensors.A test bench of mass flowmeter was built.Maize,wheat and granular compound feed were used to calibrate the relationship between the mass flow rate and the val-ue of cumulative capacitance.The models of predicting the mass flow of three kinds of granular materials were constructed,with determination coefficient R2 of 0.990 4,0.993 9,and 0.987 9,respectively.The re-sults of verifying the accuracy of chute mass flowmeter showed that the average relative error(MRE)of measurement accuracy for maize,wheat and granular compound feed was 3.11%,3.76%,and 3.75%,when the inclination angle of the chute was 15°,25°,35°,45°,and 55°,the mass of maize and wheat mass was 30,50 and 70 kg,the mass of granular compound feed was 30,50,and 65 kg,respectively.It is indicated that it is feasible to use the capacitance method in the online measurement of mass flow rate in the process of transporting granular materials through a chute,which can achieve the automatic online measure-ment of the mass flow rate of granular materials.关键词
电容/传感器/颗粒物料/质量流量/在线测量/溜管Key words
capacitance/sensors/granular materials/mass flow rate/on-line measurement/chute分类
农业科技引用本文复制引用
路开新,赵延辉,曹清,雍淦文,王田彬,刘静,牛智有..基于电容法的溜管式颗粒物料质量流量计设计与试验[J].华中农业大学学报,2025,44(2):94-104,11.基金项目
国家重点研发计划项目(2021YFD1300305) （2021YFD1300305）
