crank counterbalance
... crank counterbalance 曲柄平衡重 semaphore counterbalance 臂板平衡锤 ; 臂板平衡锤;臂板重锤 counterbalance design 衡设计 ...
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作者还认为,常规式抽油机的曲柄旋转方向应规定为逆时针,并建议研制可调相位角的曲柄平衡重。
The author holds further that the crank pin rotation on conventional pumping units should be assigned in counterclockwise...
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