在某些抽油机上，旋转平衡块可由改变其在曲柄臂上的位置进行调整。
On some pumpers, the rotary counterbalance can be adjusted by shifting the position on the crank arms.
并对两种机型提出了曲柄平衡位置工作实用图表，可供前置式抽油机设计和使用者参考。
Practical working charts for the crank balanced position of two types of units, which will give a reference to the designers and operators, are offered.
(上止点)-当活塞离曲轴最远时，曲柄和活塞的位置。
TDC (top dead center) - the position of the crank and piston when the piston is farther away from the crankshaft.
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