切割厚度可调甜菜切顶机构的分析与参数优化

In order to resolve the problem that the existed beet top cutting mechanism could not adjust the cutting thickness, a new profile top cutting mechanism was proposed. Its working principle was analyzed. The kinematic model of this mechanism was established, and the equations of (angular) displacement, (angular) velocity, (angular) acceleration of the key points of this mechanism were derived. The kinematic simulation and optimization software of this mechanism was designed based on Visual Basic 6.0, with which the effect of main parameters such as the sprocket transimission ratio k, the gear pitch circle radius Rc , the swing arm length L1, the profile wheel radius Rf, etc, on the cutting curve of the cutter and the cutting thickness of the beet top were analyzed. A set of optimal parameters was obtained with the method of human-computer conversation, which was L1=520mm，Rc=100mm, k=1/2.4, Rf=180mm , whose cutting curve and cutting thickness of the beet top can meet the agronomic requirements. The linear velocity v of the profile wheel and the traction velocity v1 were analyzed and optimized by genetic algorithm based on Matlab, and the optimization results was better than the experience value.