Avoid high stress concentrations at the ends of the work roll barrel. Ensure good control of roll bending.

避免在工作辊辊端部位应力过于集中。确保弯辊得到很好的控制。

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The bending of pump barrel will not happen as low part fixed pumping piston going downward that only happens when it works in heavy oil well.

而泵筒下部固定泵柱塞上行时，泵筒不会发生弯曲，只是其柱塞在稠油井中下行时泵筒才会发生纵向弯曲。

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