Research And Parameters Optimization On Threshing And Separating Device Of Rape

This dissertation presents the present development of rape combine home and abroad and the running principle of typical threshing and separating system. And comparative experimental investigations are done between different threshing and separating systems, such as axial-flow -short-rasp-bar- plate-tooth drum with grid concave and spike-tooth drum with grid concave.In this paper, firstly, we measured the rape's configuration parameters, agricultural characteristics, physical and mechanical characteristics of rapeseed. Especially, introducing the quality of rape pod resisting and quantitative determination the strength of rape pod dehiscence is significative to fix the working parameter of threshing device. Secondly, based on the characteristics of rape and the developmental situation of combine in our country at the present time, we choose two kinds of threshing and separating system mentioned previously as subjects investigated and carry out experimental investigations on the DF-1.5 experimental bench. Through experiments we get the regularities of distribution of outlier along cylinder's axial direction, entrained loss, unthreshed loss, the proportion of every components below system and power consumption of the two devices, and make a comparison with them between the different systems. Furthermore, by means of regression analysis, applying MATLAB software , established the mathematical models of threshing and separating system-short-rasp-bar-plate-tooth drum with grid concave, including threshing and separating total loss rate and power consumption. Lastly, we precede a multi-objective optimization on the system based on MATLAB optimum toolbox, so as to get the comprehensively optimistic running parameters for it.Based on the understanding of characteristics of rape, analytical studying on the experimental results of two different types of threshing and separating system, we make out the differences of working performance of them, which deepens our understanding on working regularity of different threshing and separating systems. At the same time, the best working parameters are determined through establishing mathematical models and proceeding multi-objective optimization for the threshing and separating system with short-rasp-bar-plate-tooth drum and grid concave. Moreover, all these research results provide some theoretical basis for further study on the threshing and separating system of rape combine, and play an important and realistic role in accelerating mechanization of rape harvest in our country.