金银花静电除杂装置设计与试验

Design and Experiment of Electrostatic Impurity Removal Device for Honeysuckle

针对金银花除杂过程中编织袋丝去除效果不佳的问题,本文基于静电分离技术,设计了一种金银花静电除杂装置。通过理论分析,推导了静电场中金银花和编织袋丝产生轨迹分离的临界条件,验证了静电分离技术用于金银花除杂具有一定的可行性。基于单因素试验和COMSOL电场仿真,进一步探究了各影响因素对除杂性能的影响,确定了静电极形状为圆弧形、静电极角度α为45°。以高压静电发生器的输出电压U、静电极与辊筒的间距L和辊筒转速N为试验因素,开展Box-Behnken试验,分别建立了除杂率和误除率的二次回归方程。采用响应面分析法探明了各试验因素对试验指标的影响规律。通过参数寻优,确定了该装置的最优工作参数为U=11.9 kV、N=28 r/min以及L=60 mm。台架试验结果显示,除杂率和误除率分别为94.47%和0.89%,满足金银花除杂要求。

Based on electrostatic separation technology,an electrostatic removal device for honeysuckle was designed to solve the problem of poor removal of woven bag filaments in the removal process.Through theoretical analysis,the critical conditions for the trajectory separation of honeysuckle and woven bag filaments in the electrostatic field were deduced,and the feasibility of electrostatic separation technology for honeysuckle impurity removal was verified.Single-factor experiments and COMSOL simulations were used to investigate the effects of electrostatic electrode shape,output voltage U of the high voltage electrostatic generator,electrostatic electrode angle α,the distance L between the electrode and the roller,and roller speed N on the removal performance.The electrode shape was determined as a circular arc,and the α was set to be 45°.The quadratic regression equations for the removal rate and the false removal rate were established by the Box-Behnken experiment,respectively.Response surface analysis was used to explore the influence of each experiment factor on the experiment index.The optimum operating parameters of the device were determined to be U=11.9 kV,N=28 r/min,and L=60 mm.The results of the bench experiment showed that the impurity and false removal rates were 94.47% and 0.89% respectively,which met the requirements for removing impurities from honeysuckle.The device proposed effectively removed woven bag filaments from honeysuckle and may provide a reference for the design of similar herb removal devices.