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.
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.
这是“揉捻”，也就是给茶叶“美容造型”。
This is "rolling" namely "beauty and modeling" for tea leaves.
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.
对于绿茶，新鲜的茶叶在揉捻和干制以前先经加热或汽蒸，使酶失活。
For green tea, the fresh leaves are heated or steamed to inactivate enzymes before they are rolled and dried.
对于绿茶，新鲜的茶叶在揉捻和干制以前先经加热或汽蒸，使酶。
For green tea, the fresh leaves are heated or steamed to inactivate enzymes before they are rolled and dried.
对于绿茶，新鲜的茶叶在揉捻和干制以前先经加热或汽蒸，使酶。
For green tea, the fresh leaves are heated or steamed to inactivate enzymes before they are rolled and dried.
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