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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揉捻之后，茶叶被运回炒锅里开始第二轮翻炒，那些紧贴着炙热铁锅的茶叶的体积将进一步缩小。

After rolling, the tea was sent back to the drying pans for a second round of firing, losing even more volume at every contact with the hot sides of the iron wok.

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这是“揉捻”，也就是给茶叶“美容造型”。

This is "rolling" namely "beauty and modeling" for tea leaves.

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