花生捡拾联合收获机捡拾装置参数优化及试验

为了提高花生捡拾收获机捡拾机构的作业质量,提高捡拾率,降低落果率,在已有研究基础上,以机器前进速度、弹齿回转速度、齿尖弯曲角度为影响因素,以捡拾率和落果率为考察指标,运用Box-Benhnken中心组合试验方法对捡拾收获机捡拾机构的工作参数进行了试验研究,建立响应面数学模型,分析了各影响因素对作业质量的影响,对相关参数进行了综合优化。结果表明:各因素对捡拾率影响显著顺序依次为回转速度、前进速度、弯曲角度;对落果率影响显著顺序依次为前进速度、回转速度、弯曲角度;最优参数组合为前进速度为0.8 m/s、回转速度5.0 rad/s、弯曲角度1 6 5°,捡拾率为9 9.3 6%,落果率为0.5 8%。

Experiment and Parameters Optimization for Pickup Mechanism of Peanut Harvester

In order to raise working quality of pickup mechanism of peanut harvester, increase the pickup rate and reduce the rate of peanut pods drop, in this paper, a experiment was designed on the basis of existing research.The forward speed of machine,rotary speed of spring-finger and tip angle of spring-finger were taken as the influencing factors.The pickup rate and the rate of fruit drop was used as test indexes.According to the above factors and indexes, this paper took Box-Benhnken central composite experimental design method to arrange experiments, established mathematical model about the response surface through Design-Expert 8.0.6,analyzed these factors how to influence the working quality of the pickup mechanism,and optimized relevant parameters.The results showed that trial factors had great effects on the working quality.The significant effects of rotary speed of spring-finger,forward speed of machine and tip angle of spring-finger on increasing pickup rate were in a decreasing order.The significant effects of forward machine speed, rotary speed of spring-finger and tip angle of spring-finger on reduce the rate of peanut pods drop were in a decreasing order.The optimal parameter combination was obtained, which was 0.8m/s as the forward speed of machine,5.0rad/s as rotary speed of spring-finger,165o as tip angle of spring-finger, with this optimal parameter combination, the pickup rate was 99.36% ,the rate of peanut pods drop the rate of peanut pods drop was 0.58%.