Dynamic Analysis Of Rotating Transplanting Mechanisms With Different Non-circular Gears

Rice is one of the most important crops in China.Its yield determines the food security in China and the world.The mechanization level of rice cultivation in China is very backward than Japan and South Korea,so it is indispensable to improve the level of mechanization in China for rice production,development and social progress.Rotary transplanting mechanisms is the main working parts of high-speed rice transplanter,and non-circular gear is the focus of the study.Scholars in China have many research methods for non-circular gear,its kinematics can meet the target,but the dynamics analysis is rarely.There is a lack of research on the stability and vibration of mechanical system.The main research contents and conclusions are as follows:1)The development status of high-speed rice transplanter at home and abroad was studied,and the research on the transplanting mechanisms was mainly analyzed.This article analyzes the working principle of the rotary transplanting mechanisms,improves its kinematics model,establishes the dynamic model,draws the dynamic solution block diagram,and writes the dynamics auxiliary analysis software based on MATLAB software.2)Analyzed the differences of three kinds of non-circular gear,this article obtains the results about the dynamics auxiliary analysis software.The dynamic results of three kinds of non-circular gear transplanting mechanisms are analyzed,and the optimal dynamic performance is obtained.Through the dynamic simulation of the mechanism virtual prototype,the mechanism dynamics analysis and the correctness of the results are verified.3)The dynamic test bench was set up to test the bearing reaction force of three different gears under the rotary of 150r/min and 250r/min respectively.The experimental data are processed and compared,and the influence of the rotational speed on the dynamic performance is analyzed,and the analysis of mechanism dynamics and the correctness of the results are verified.4)The principle of "flywheel" is used to calculate the moment of inertia for the weight block,and the dynamic performance of the mechanism is optimized.The weight block is installed in the transplanting mechanisms to test the bearing reaction force of the intercalation mechanism.The influence of the weight block on the dynamic performance is analyzed.Finally,it is shown that the transplanting mechanisms with the weight block is more stable.