我厂81台21号浮选机中的48台原设计使用有拔销的1213双列调心球轴承。这种轴承与竖轴固定是通过一个带有拔销的紧定套来实现的。多年来,由于这种紧定套的加工精度要求较高,加工较困难,很难保证质量,结果造成大多数浮选机轴承固定不牢,经常发生故障,使用寿命短(半年左右)。针对 My factory 81 sets of 21 flotation machines in the original design of 48 have pulled out of 1213 double row aligning ball bearings. This bearing is fixed to the vertical shaft by means of a pull-off adapter sleeve. Over the years, due to the tight set of high precision machining requirements, processing more difficult, it is difficult to ensure quality, resulting in most of the flotation machine bearings are not firmly fixed, frequent failures, short life expectancy (about six months). against