大型立式离心铸机轴系结构的改进

Improvement of Shaft Structure of Large Vertical Centrifugal Casting Machine

针对大型立式离心铸机存在的振动问题,提出了轴系结构的改进方案,即在主轴的上端采用双列圆锥滚子轴承与推力调心滚子轴承的组合作为主承载轴承、而在其下端安装双列圆柱滚子轴承作为径向承载轴承。这一结构不仅可以提高主轴的回转精度和振动稳定性,而且还具有很高的模态频率,从而完全避开铸机工作时产生的外部激励,有效地防止共振,减小铸机的振动。设计计算表明这一改进方案是合理可行的。

Aiming at the vibration problem of vertical centrifugal casting machine, an improvement scheme of shafting structure was put forward. A combination of a double row tapered roller bearing and a spherical roller thrust bearing was used as the main load bearing. But in its lower end, a double row cylindrical roller bearing was installed for radial load bearing. This structure can improve the spindle rotary precision and stability, and has high modal frequency, so as to completely avoid the external excitation caused by the casting machine. This can effectively prevent the casting machine from sympathetic vibration and reduce vibration. The design and calculation show that the improved scheme is reasonable and feasible.