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通过几何分析详细推导出了旋转驴头抽油机驴头弧面理论节线计算的极坐标公式，并给出了计算该抽油机冲程长度的两种计算方法，最后介绍了驴头侧板的两种下料方法及驴头剖分成主、副驴头的设计原理。
Through the geometric analysis, the polar coordinate formula of the theoretical calculation of the donkey head arc surface of the donkeyhead pumping unit is deduced in detail. Two calculation methods for calculating the stroke length of the donkey head are given. Finally, The two cutting methods and donkey head into the main, vice donkey head design principles.