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。
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。
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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