Research On Key Technologies And Prototype Development In Small Head-Feeding Rice Harvester

China is a large agricultural country, agriculture is very important to the whole country. The 18th National Congress proposed to vigorously promote the process of agricultural modernization. The core of the agricultural modernization is the agricultural mechanization, crop harvest mechanization is an important link of agricultural mechanization. Rice is one of the most important grain crops in China, planting area is huge, seeking fast, efficient, high quality harvest method has positive significance to improve the level of agricultural mechanization, accelerate the process of agricultural modernization, and promote the development of the national economy. The hilly area of southern rice planting area accounts for about 1/2, as the field small fields, the whole-harvester and large head-harvester is difficult to adapt to this kind of area. In addition, hilly areas underdeveloped, rice harvesting mechanization level is very low. Other else, because of the influence of technical level, the monopoly of foreign brands, the development in china has been relatively slow. Therefore, it is necessary to research the head-harvester suitable for hilly areas.In this paper, a two-row head-harvester as the research object, through designing the overall scheme, solving the key technology,researching virtual prototyping, get physical prototypes, then the performance of the harvester is studied. The main research contents are as follows:1. Research on material separation properties of the clear system. According to the factors affecting the material sieving properties, According to the factors affecting the material sieving performance, analysis of the movement of the vibration sieve, the movement of the material in the gas flow field, the movement of the material in the sieve surface of constant motion, material of inter particle collision, material separation probability On the basis of the above analysis, using the method of uniform design, Simulated the motion of the material in the flow field and on the sieve surface, single material and material group separation process. Using the regression analysis, analyzed the simulation results, established the lowest energy consumption, the shortest separation time and material sliding displacement multi-objective optimization mathematical model. Using the optimization toolbox of MATLAB, the optimal working parameters are obtained. The optimization results has great guiding significance to cleaning structure improvement design and prototype development.2. Research on the new cutting drive mechanism. The new cutting driving mechanism use spatial linkage mechanism to replace the traditional planar linkage (patent application. patent No. CN201120105449.6). Established the mathematical model of the new mechanism, based on the similar complex vector method, derived the equations of motion. Using the harmonic characteristic parameter method, established the Numerical atlas model. Completed of the new mechanism size synthesis and optimization. Comparative analyzed of the new mechanism with pro208 from size and force transmission performance. the results show that the two indexes are better than those of traditional organization model.3. Research on the new integrated HST. Analysis of the internal structure, working principle and hydraulic system principle of the new integrated HST, Optimized the two key transmission gear in HST. Consider the cutting platform work in practical harvesting process is more severe, vibration, impact, damage characteristics of precision hydraulic components, established the optimization mathematical model of minimum volume/mass vibration acceleration to minimize for the cutting table gear. In order to adapt to the characteristics of HST highly integrated, optimized the size of the driving gear, established the optimization mathematical model of the minimum distance of center. The optimization results are obtained by using the MATLAB optimization toolbox.4. Research and Development 3D virtual prototyping. According to the general design requirements, design objectives and considering the development of the economy and feasibility, designed the overall scheme of the two row head-harvester. Using the 3D software modeling more than 4700 components, and the 3D assembly, obtained the virtual prototype of the harvester.5. Research and test of physical prototype. In 2013 August to mid September early rice harvest period, according to the test standard harvester performance, the high strength cutting test the physical prototype about 20 days. The core indicators of loss rate, the impurity rate, broken rate, stubble height, stem placement quality, productivity of harvester is tested, compared the test data and performance data currently on the market mainstream joint venture, domestic brands harvester.Through this paper research, physical prototype can well adapt to mountainous hilly area of South China, and the operating performance can reach the level of performance the same kind of joint venture brands harvester, this will undoubtedly promote the head-feeding small two row harvester in China to further in-depth study and application, has great academic significance, economic benefits and social benefits.