揉捻机是一种可保持茶叶纤维组织不致破坏，且能确保茶叶品质均一，操作简便的机器，称之为茶叶揉捻机。
因此，保持加工场所的清洁卫生和调整揉捻机揉筒和揉盘的金属组成是降低茶叶加工过程中铅和铜污染的有效途径。
Therefore, keeping clean in workshop and regulating the metal constitution of rolling machine could reduce the Pb and Cu pollution during tea processing.
介绍了基于西门子S7系列PLC的步进电机控制在茶叶揉捻机中的应用，论述了控制系统的设计方案及其硬件的实现方法。
This paper introduces the application of the stepper motor control in tea twisting machine based on the SIMATIC S7-200 series PLC.
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