For ball mill this special equipment, its life cycle is long, some can even for 10 years.

对于球磨机这种特殊设备，其生命周期很长，有些甚至可以达10年之久。

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Single row angular contact ball bearing with two piece inner ring has complex construction, long design cycle, great difficulty in processing.

双半内圈四点接触球轴承结构复杂、设计周期长、加工难度大。

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Further, the principles and ways which solve the crucial question are given, that is, two supports consisted of three-ball bearing are combined with the sealing by differential gas flow cycle.

进而阐述了解决这些关键问题的原理和方法，即两个三滚珠轴承支承和差动气流循环密封相结合的方法。

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