Theory and experiment of high-speed seed filling in limited gear-shaped side space based on seeds group stress
In order to solve the problem of arch lifting and leakage of hole-type seeder in high-speed operation(more than 4 km/h),a new method of high-speed seed filling with arrangement and state-of-motion adjustment guided by limited gear-shaped side space(seed holding space)based on stress of the seed group was proposed,and the corresponding seed tray was designed.By establishing the kinematic model of the filling process of cotton seeds in the seed holding space,the mechanical analysis of the cotton seeds with arrangement and state-of-motion adjustment is carried out,and how to quantitatively separate the seeds step by step through the three stages of semi precision filling,self-adaptive state-of-motion adjustment and migration,and rotating quantitative filling is described,so as to avoid the arch lifting and leakage in the filling process.The box Behnken central combination method was used to carry out the three factor and three level regression orthogonal test,and the regression models of qualified index,leakage index and multiple index were established respectively.The parameters of each influencing factor were optimized with the qualified index,leakage index and multiple index as the objectives.The optimal parameter combination was:the friction coefficient was 0.46,the seed height was 0.4 kg(in this paper,the total mass of seeds in the seeder was used to replace the seed height),the rotate speed is 1.8 r/s(the linear speed is 9.36 km/s),providing a maximum qualified index 98.03%,a minimum leakage index 0.40%,and the multiple index is 1.57%.Under these conditions,the qualified index is 92.86%,the leakage index is 6.43%,and the multiple index is 0.71%in the bench test,which has little error with the simulation results.
mechanical design and theoryhill-drop plantergear-shaped side spacehigh speedstate-of-motion adjustment and arrayment
万方数据
维普
