According to the deficiency of existing friction separation mechanisms of mailing machines,this paper proposed a new type of friction separation mechanism,analyzed the conditions of friction separation and obtained calculation formula of the pressure roller's gap adjustment.A dynamics simulation model of this mechanism

was established by LS-DYNA software and the speed,acceleration and the positive

pressure of the envelopes,friction forces suffered in the separating process were analyzed by finite element simulation.The problem of how to classify the envelope thickness through the adjustment of the angle of pressure roller, and the influences of different heights

of supporting roller and transmission speeds on the effectiveness of envelope

separation were studied in order to optimize the related parameters of this friction separation mechanism.The results show that the matching method of classifying envelope thickness, adjusting supporting roller's height and conveyer speed can increase greatly

the effectiveness and efficiency of the separation mechanism.

根据现有邮资机信封分离机构的不足,提出一种新型的摩擦分离机构,并建立了该机构摩擦分离条件及压辊的间隙调节计算公式。采用LS-DYNA建立了机构的动力学仿真模型,对分离过程中信封的速度、加速度以及信封所受的正压力、摩擦力进行有限元仿真分析,研究了调整压辊角度进行信封厚度分级的问题,

以及不同托辊高度和传送速度对信封分离的影响,并对摩擦分离机构相关参数进行了优化。结果表明,采用调整压辊角度进行信封厚度分级并结合托辊高度调整和传送带速度匹配的方法,能大大提高信函的分离效果及效率。

分离机构, 摩擦, 压辊角度, 有限元仿真