The article introduces systematically the schematic method for the six-bar modification of a conventional pumping unit by use of Stephenson' chain.
系统地介绍了采用斯蒂芬森链对常规型游梁机进行六杆式改造的图解方法。
The conventional pumping unit is still the main pumping unit in the field at present, the main reason is that its structure is simple, operation and maintain are convenience, and its use life is long.
目前各油田的抽油设备主要仍为常规游梁式抽油机，其主要原因是该机结构简单，操作维护方便，使用寿命长。
A dual variable-diameter wheel pumping unit, which has long stroke and low pumping speed and large load capacity, is designed based on conventional beam pumping units.
双变径轮式抽油机是在继承常规游梁式抽油机优点的基础上设计而成的大载荷、长冲程、低冲次节能型抽油机。
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