【摘要】 本文主要介绍兰石所抽油机在驴头、连杆、曲柄销等零部件结构方面的改进和使用效果。更多还原

【Abstract】 Some structural improvements on parts and components of the LPMRI’s pumping units, including horse head, pitman and crank pin, and substantial results obtained through practice are mainly introduced here.更多还原