| At present,the domestic research in precision seeding is relatively backward abroad,because the working environment of the seeder is relatively harsh,so it puts forward higher requirements for the reliability of its seeding performance,the traditional seeder is generally driven by the ground wheel,easy to produce the phenomenon of ground wheel slippage,resulting in unsatisfactory sowing qualification rate.In this study,an electrically driven soybean seeding control system was designed according to the actual situation of Heilongjiang Province and the working characteristics of soybean seeding,and the ground-wheel drive was changed to electric drive,aiming to improve the seeding performance of the seeder.In this study,STM32 single-chip microcomputer is used as the core controller,using stepper motor to drive the seeder,and using the radar velocimeter to monitor the working speed of the implement,so that the speed of the seeder is synchronized with the working speed of the implement,so as to improve the qualification rate of seeding.The specific The specific research contents of this study are as follows:(1)Select the most suitable seeder type for seeding objects,and improve the performance of the seeder in the test by optimizing the structural parameters.(2)An electronically controlled seeding scheme including a data acquisition module,programmable controller and actuator is proposed,aiming to solve the problem of missed broadcasting caused by ground wheel slippage.(3)Write the program of the electronic control arrangement system,first model according to the connection between mechanical components and hardware systems,and write the corresponding command modules and functions according to the modeling results.The main structural parameters and operating parameters of the seeder were analyzed,and the seeder was simulated and trained by EDEM software.(5)The seeder control system was bench tested,the whole system was optimized in the test,and its performance indicators were tested and analyzed in detail.The system was then applied to a prototype soybean seeder for field trials.In the test,through actual operation and observation,the performance and stability of the system are comprehensively evaluated,and the coefficients in the software are corrected accordingly to ensure the accuracy and reliability of the system.(6)Field test of the control system shows that when the tool is driving in the stabilization stage,the maximum value of the average error is 7.87%,the minimum value is 2.19%,and the control accuracy is high;Among the driving conditions,medium and high speed(8km/h<v≤10km/h)has the best stability,the minimum error is 0%,and the maximum error is 6.41%;Under the three traveling conditions of low speed,medium and high speed and low to high,the qualification index and coefficient of variation of each passing species were ideal,among which the qualification index was ≥ 89.5% and the coefficient of variation was ≤ 0.41;in the process of high-speed travel(≥10km/h),the qualification index and plant spacing coefficient of variation showed obvious changes,and the pass rate was low.The plant distance correction coefficient k1=1.06 can be obtained from the experimental data.k2=1.04。... |
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