| Our country is agricultural country,corn is the important food crops in our country,the northeast is an important base for China's corn production,but at the same time,although the application of chemical fertilizers ensures the production of grain,the environmental pollution problem cannot be underestimated.So the study of corn hole fertilization mechanism can play a positive role in reducing the application of chemical fertilizers and increasing the utilization rate of chemical fertilizers.In this paper,based on the theory of corn hole fertilization,a set of corn variable hole fertilization control system and supporting test bed were designed according to the two modes of corn seed and fertilization and medium-term top application.Based on the previous research on variable fertilization by the outer trough fertilizer apparatus,the corn hole fertilization is realized by controlling precise operation of the stepper motor and design of the precise operation of the stepping motor and the rotation of the stopper opening of the fertilizer discharge port.Meanwhile,the synchronization of seed and fertilizer can be realized by cooperating with the monitoring device of corn seed distributor.The main research methods and conclusions in this paper are as follows:(1)This paper analyzed the principle and process of common corn fertilization technology,according to the national and industrial standards,the agricultural technical requirements of the corn hole fertilization were proposed;(2)The hardware and software design of the corn variable hole fertilization test bed and its control system were designed out.It mainly includes the design of the test bed,the circuit construction of the control system each module and selection and calculation of the stepper motor.In software design,the Keil C software is used to modularize the control system software.At the same time,MATLAB R2016 a software is used to establish the mathematical model of two-phase hybrid stepper motor.The problem of stepper motor losing step is solved by fuzzy-PID control algorithm,and create a control Simulink simulation module in Matlab to simulate,the simulation result shows that the fuzzy-PID control algorithm has superiority in the highly nonlinear stepper motor control,and ensures the accuracy of the corn hole fertilization and fertilizer discharge mechanism rotation control;(3)The experiment of corn variable hole fertilization was adopted.Through the performance test,under the two control modes of autonomous hole fertilization and synchronous hole fertilization,the total variability coefficient of the hole fertilization,the horizontal distance of the fertilizer and the hole distance qualification index met the fertilization requirements.In addition,the multi-factor experimental study was conducted with the vehicle speed,the speed of the fertilizer shaft and the working length of the fertilizer discharge device as the factors,the error value of the fertilizer application as index.Through the Design-Expert8.0.6 software,the primary and secondary factors affecting the amount of fertilization were analyzed,and the primary and secondary factors affecting the amount combination of fertilizer applied by vehicle speed,the speed of the fertilizer shaft and the working length of the fertilizer discharge device as well as the optimal combination of working parameters were obtained,the test results show that the system meets the relevant requirements.In summary,according to the agronomic requirements,the experiment of corn variable hole fertilization test bed and control system designed in this study was adopted.The test results obtained that all meet the relevant requirements.It could provide a theoretical basis for future research on corn hole fertilization. |
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