Dynamics Analysis And Tests Of A Rotary Rice Pot-seedling Transplanting Mechanism

Rice is one of the most important food crops in China, its output accounts for nearly half of the total grain output.it is a kind of food crops with largest planted area, high production per unit area and highest total production. With the increase of population, industrialization and urbanization in China, the area of arable land is decreasing year by year, and it is becoming more and more important and urgent to realize the mechanization of rice planting. In 2015, the State Council issued the "Made in China 2025", agricultural equipment was listed as one of ten priority areas of manufacturing. Therefore, rapidly improving the rice planting mechanization level and fully relying on scientific and technological progress is very important to ensure food security in our country, to promote the development of manufacturing strategy.According to different agronomic methods, rice cultivation is divided into direct seeding and transplanting. The pot-seedling transplanting is directly planting the pot-seedling with its nutrition solid to paddy field. It has a lot of advantages, such as strengthening seedling, shorter adjustment period, more effective tiller, saving water, saving hours of work, saving seeds, saving fertilizer, and so on. It is recognized as the best way to increase production in addition to breed improvement, but the corresponding machine of rice seedling transplanting has developed slowly. The rice pot-seedling transplanting mechanism is the core components of the pot-seedling transplanting machine, and its development directly affects the development and application of the pot-seedling transplanting equipment. Therefore, it has great scientific significance and application value to deeply study the kinematics and dynamics characteristics of the rice pot-seedling transplanting mechanism, and to establish the theoretical design method and test method systematically.The paper takes an innovatively designed rice pot-seedling transplanting mechanism of planetary gear train with ellipse gears and incomplete non-circular gear as the research object, further improves the kinematics model of the mechanism. And the dynamic modeling and analysis of the mechanism and the related experiments are deeply studied. The main research contents and conclusions are as follows:1) The kinematics model the transplanting mechanism was improved. The mathematical equations of displacement, velocity and acceleration of the key points were listed, and the kinematics equation of the buffer was established. Kinematics analysis software was written, based on the Visual Basic 6.0 software. The theoretical analysis results of the mechanism were obtained by using it.2) According to the purpose of dynamic analysis, the assumptions and basic ideas of analysis were put forward. The dynamics equations were established by using the methods of dynamic static analysis and the dynamics equation group sequence-solution. The dynamics model was solved with the use of a dynamics analysis software which was independently developed. Finally, combined with the structure and working mechanism of the transplanting mechanism, the calculation results were analyzed in detail, and the dynamic characteristics and vibration law of the mechanism were mastered basically.3) The dynamics experimental scheme of the transplanting mechanism was established. The test prototype and the dynamic test bench were made, and the mechanism dynamics test was carried out. The support force of the mechanism in a working cycle under 130 r/min,160 r/min, 190 r/min 3 kinds of different working speed was obtained. Through the analysis of the test data, the dynamics performance of the mechanism was mastered. By comparing the test curves and the theoretical curves of the support force, the correctness of dynamic theoretical model analysis method and analysis results was verified.4) The impact of transplanting mechanism during working was analyzed. The dynamics performance of the transplanting mechanism was optimized by changing the motion law of the buffer device and improving its structure. The design and analysis software of the buffer device was written and its kinematics and dynamics analysis were carried out. The results showed that the impact of transplanting mechanism was improved obviously.