By taking 135 three-screw pump as an example, the geometric parameter design, the forming of spiral surface and the characteristic of screw gearing are investigated.
以135型三螺杆泵为例，对螺杆几何参数设计、螺旋型面的形成、螺杆啮合特性进行了探讨。
Because planet differential gearing has some weakness someone suggests we can use hydraulic transmission to drive the horizontal screw decanter.
采用行星传动差速器的卧螺离心机存在很多不足，提出了用液压方式驱动卧螺离心机的方法。
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