Mechanism Of Grain Yield Sensor Based On Helical Lift

Grain yield measurement automation is an important part of the implementation of precision agriculture harvest stage,and the yield can also reflect the growth and management of grain yield,but the measurement of real harvesting machinery is always a difficult problem in agricultural production,so the yield space to obtain accurate distribution information is crucial for the implementation of precision agriculture.The key technology for the purpose of this research is through the study of grain yield monitoring system,is developed based on a spiral lifting principle yield sensor,adopts the embedded processor for real-time monitoring of the production information,to achieve low power consumption and high measurement accuracy.According to the principle of spiral lift,a set of grain yield test platform is designed,and the 12 V DC motor is used to provide the lifting force.According to the physical structure of the spiral lifting and the force of the grain in the conveying chamber,the dynamic analysis is carried out in the process of the spiral motion and the steady conveying,and the critical speed of the spiral motion is obtained.According to the DC motor parameters of spiral lifting structure of test-bed and the critical speed of the physical constraints,selected factors influence the experimental measurement(including body tilt angle and motor speed),respectively for grain yield experimental error analysis and comparison of power consumption,the final selection of the best scheme.The measurement system consists of spiral lifting grain output sensor and host computer PC,which can realize grain output information collection,calculation and storage function.The specific functions are as follows:(1)To constitute a grain output sensor,the core processor is generally selected high performance and low power consumption component,in this graduation project,is selected with the ARM Cotex-M3 STM32F103VCT6 embedded processor core type WHB20LSP5S2H;Holzer effect principle-closed-loop current sensor for current monitoring circuit of the core components.Provide a detection method with high precision and low energy consumption;in order to display and set the speed and current state of spiral conveyer,the human-computer interaction module to set screw lifting motor PWM percent,on the spiral lifting motor to startand stop at the same time,the resolution of 128*64 OLED display,parameter setting and monitoring data;(2)PC terminal assistant through the serial port and wireless receiver module,the spiral grain output sensor lifting motor speed and current real-time monitoring,collecting yield information is completed,you can save the data through the serial port assistant,the data collected in the import EXCEL,plotted for call.In this paper,the dynamic analysis of the grain in the cylindrical cavity under general dynamics and steady transportation is carried out,and a set of measuring methods for calculating the grain yield according to the parameters of the conveying motor is established.According to the research method,a grain yield monitoring system based on screw conveyor is designed,and the flow rate of the grain is calculated by collecting the relevant parameters such as voltage,current,speed and so on.The experimental results show that the scheme is feasible and the design cost of grain flow sensor is reduced.