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 article introduces systematically the schematic method for the six-bar modification of a conventional pumping unit by use of Stephenson' chain.
圆柱链低矮式超长冲程抽油机是一种新型高效有杆采油设备。
The cylinder chain lower super long stroke pumping unit is a kind of up to date and high efficiency equipment.
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