| Rice is the largest planting area, the highest yield and the most production in our country. It has a important position in food security. The rice planting area accounted for35.15%of China’s grain planting area, it’s planting area has53.3million hectares in Heilongjinag provinces that increased by47%in five years, which planting area is in the first place. At present, The cultivated land is decreasing, population scale expands unceasingly. To improve the ability of rice production, increase yield in particular that is the guarantee of our country’s food security strategy in the long strategic goals. However, the country’s increasing population leads to the growth of demand for food which supply more difficult. So under the limited labor and farming area constraint, to improve the level of rice production mechanization comprehensive appear and key. The comprehensive agricultural mechanization level is still very low stage in China, which is the most rice planting mechanization level is weak. To Speed up the development of mechanization of rice production that reduce the labor intensity of rice production, to improve labor productivity, increase production, increase revenue, reduce the production cost that is to improve the comprehensive production capacity of rice, the important measures to secure reliable supplies of food security in China.With our country’s factory machinery seedlings cultivation technology of gradual development and perfection, in the rice planting rice pot seedling transplanting machine application will be further promoted. Therefore, to develop a simple structure, reliable performance of the pot seedling transplanting mechanism which is to meet the needs of the broad masses of farmers. The transplanting mechanism should meet the development of our country national condition, which has extensive applicability, it can promote can realize super rice planting. The rice planting mechanization for the improvement of overall level is of great significance.In this paper, which is based on the non-uniform b-spline curve fitting theory invented a new type of rotary non-circular gear planetary system automatic rice pot seedling transplanting mechanism. The agency can form the rice pot seedling transplanting walk after insert special trajectory,"8" glyph successfully complete take seedlings with a set of institutions, conveying and planting three movements, has simple structure, low cost, small vibration, high efficiency, etc. The concrete research content is as follows:1) By comparing the domestic and foreign rice pot seedling transplanting’s working principle and the anslysis of motion characteristic, points out that the rice pot seedling transplanting mechanism research have a crux problem. To device a transplanting mechanism which has simple, stable, effcient structure.2) To detail b-spline non-circular gear planetary gear train working mechanism and characteristics of the rice pot seedling transplanting mechanism, by moving the non-circular gear planetary gear train itself formed by the compound movement. To make the transplanting arm that has formed special "eight" static track. Establish b-spline non-circular gear planetary gear train on foot after insert the rice pot seedling transplanting mechanism, the mathematical model and kinematics analysis of the institutions. According to the characteristics of the rotary transplanting mechanism optimization, namely multi-objective parameter, strong coupling; Based on MATLAB7.0GUI software development platform, developed the "non-circular gear rice pot seedling transplanting computer aided analysis and optimization software"(software registration number is:2013sr071209), and develop parameter optimization goal, and to quantify it. Through the optimization method of the human-computer interaction can optimize the parameters of transplanting mechanism, optimization parameters adjusted step by step, make it conform to the requirements of the transplanting mechanism of targets, pointed out the direction of the parameter optimization for transplanting mechanism, and gives out a group of transplanting mechanism of the best parameters.3) Through optimization software optimization of parameters which under the environment of AutoCAD2008draw the assembly drawing and parts drawing completed the institutions, and by using the UG8.0optimization modeling and draw2d drawings, and generate a3d figure and3d assembly as a whole.4) To establish the virtual prototype model of transplanting mechanism, and the virtual prototype in ADAMS2010dynamic simulation test. By transplanting mechanism of dynamic simulation trajectory analysis comparison in order to verify the correctness of the theory of mathematical model, and according to the analysis of the results to further optimize the structure design.5) According to the optimization of the optimal result, it have no the rotary non-circular gear planetary gear train rice pot seedling transplanting mechanism to carry on the prototype test, combining with the virtual prototype simulation results. Through field experiment, to find and solve problems, the accumulation of experience, to prepare for the next step for the perfection of transplanting mechanism. |
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