Design And Simulation Analysis Of Seedling Feeder Mechanism Of A New Kind High-Performance Wide-Narrow Row Rice Transplanter

Grain is the most essential means of livelihood for human kind. However, in recentyears, food crisis has been a great threat to food supply in every country all over the world,some African countries even lack of grain badly.China has been developing rapidly in recent years and of which economicachievements have been the focus of attention of the world. However, accessible cultivatedland are decreasing fast because of economic development and quick urbanization. Thereare data showing that the area of cultivated land has got very close to the ‘two bottomlines’. Paddy rice is grown in most regions in China and rice is one of the staple foodgrains. Therefore, it is important to ensure yield of paddy rice so as to ensure food security,which requires us to effectively guarantee and increase yield per unit area of land. Sometests shown that mechanization of cultivation of paddy rice is beneficial to increase yield ofpaddy rice and wide-narrow-line plantation technology features high quality, high yield,reduction of cost and increase of efficiency. By combining those two together,wide-narrow line paddy rice planter has been developed. However, because China has avast territory and paddy rice is planted in most areas, it is necessary to design one kind ofhigh-speed rice planter of which width of planting line can be adjusted so as to adapt todifferent conditions in each area.This article mainly described the design and simulation analysis of the movablecompartment mechanism of a new high-speed adjustable wide-narrow-line rice planter andverification of key components and design of test platform for fatigue test of such movablecompartment.The over-all structure of such movable compartment is mainly designed by usingmethod of reverse engineering with reference to figuration structures and selection ofmaterials of existing mature machine models. Basic design tasks are finished afterpreliminary design and optimization and then screw shafts of key components areredesigned. Curve of rotation of spiral groove are calculated by using the establishedspring impact reduction model. Cam shaft of longitudinal seeding delivering mechanism isalso redesigned. Corresponding positions of cams at two sides are changed withconsideration to stroke of seeding compartment and change of phase of rotation. Slider,sliding bush, connecting bracket and other parts are same to original designs or slightlychanged.3D modeling of each part is done by Pro/E3D modeling software and thengeneral assembly is finished.After that, by analyzing movement process of slider in movable compartment andcalculating based on equivalent spring impact reduction model established when designingscrew shaft, maximum load of slider is got. Afterwards, ANSYS/Workbench finite elementanalysis software is used to analyze statics strength and fatigue strength to verify thestrength of parts.Because screw shaft is long and thin, model analysis module of ANSYS/Workbenchsoftware is used to carry out the model analysis of screw shaft and the formation drawingof phase one to phase eight is acquired, which helps to fully understand relevant information about vibration of screw shaft. At the same time, conclusion that vibrationfrequency of movable compartment mechanism under normal working conditions wouldnot incur damages to screw shaft is reached.In order to further testify the correctness of model analysis to screw shaft by thevirtual simulation software, model analysis testing equipment supplied by JiangsuDonghua Testing Technology Limited has been used to carry out model test to screw shaftand the test result is same to the result of simulation analysis.However, there will be abrasion in different levels on different components ofmovable compartment mechanism, especially the slider and the sliding bush. For thatreason, it is planned to set up one test platform for testing and assessing fatigue strengthand degrees of other damages of movable compartment mechanism. Because the time islimited, only theoretical design and3D modeling of such test platform are finished. Furtherworks remain to be finished.