螺纹管吸附式名优茶采收器设计与试验

Design and Experiment of Threaded Tube Adsorption Type Famous Tea Harvester

针对名优茶选择性采摘时,因茶叶附壁导致收集成功率低的问题,根据一芽二叶的物理参数设计了一种螺纹管吸附式茶叶采收器。通过预试验得到了影响茶叶收集成功率的因素:负压、螺纹线数和螺纹导程的参数范围;采用Fluent仿真和Box-Behnken响应面分析法,研究各因素对茶叶收集成功率的影响。试验结果表明:3个因素改变管内近壁面处的空气切向速度;各因素对收集成功率的影响显著性主次排序为:负压、螺纹导程、螺纹线数;以茶叶收集成功率为优化目标对各参数进行优化并对优化后的参数取整,得到参数为:负压H=120 Pa、螺纹线数N=9、螺纹导程S=95 mm。以优化后的参数进行吸附式收集试验,结果表明收集成功率为98%,即优化后收集成功率相较于优化前提高26个百分点,试验值与预测值的相对误差小于5%,优化模型结果可靠。

In order to solve the problem of low collection success rate caused by the attachment of tea leaves to the wall during selective picking of famous tea,a tea harvester was designed according to the physical parameters of one bud and two leaves.The factors that affecting the success rate of tea collection were obtained through pre-test:the negative pressure value,the number of thread lines and the parameter variation range of thread lead.Fluent simulation and Box-Behnken response surface analysis were used to study the interactive influence of various factors on the success rate of tea collection.The experimental results showed that three factors changed the tangential velocity of air near the wall in the pipe;in the order of significance,the influence of each factor on the success rate of collection was negative pressure value,thread lead and thread number;taking the success rate of tea collection as the optimization goal,the parameters were optimized and rounded,and the parameters were obtained as follows:negative pressure value H=120 Pa,thread number N=9,thread lead S=95 mm.The optimized parameters were used to carry out adsorption collection test,the results showed that the success rate of tea collection under this condition was 98%,that was,the success rate of tea collection after optimization was 26 percentage points higher than that before optimization,and the relative error between the experimental value and the predicted value was less than 5%,so the optimization model was reliable.