The internal clearance of the bearing is too small. The operating temperature rises rapidly: the bearing inner ring taper hole and the adapter sleeve fit too loosely, and the bearing is prone to failure and burnout in a short time due to the looseness of the mating surface. The internal clearance of the bearing is too small or the design and manufacturing accuracy of the machine parts is not good, which are the main reasons for the high operating temperature Wholesale non-standard bearings of the extension bearing.Therefore, the large-scale fan adopts automatic centering Adjusted spherical roller bearings. However, when the internal clearance of the bearing is insufficient, the automatic centering function of the rolling elements in the bearing will be affected due to the limitation of the movement space, and the vibration value will increase instead. It was found that the bearing roller at a specific position on the shaft was also rolling in the non-load area. After the reinstallation is completed, the fan is restarted, and the bearing vibration value and operating temperature have returned to normal. After re-testing, the failure of the free end bearing with high temperature and high vibration value occurred. Remedy: When handling, pull down the adapter sleeve, re-adjust the tightness of the shaft and inner ring, and take 0. Bearings with ring-fitted housings, however, are prone to problems due to negligence in the installation procedure, especially the adjustment of the appropriate clearance. The measurement shows that the internal clearance of the bearing is only 0. It is convenient for the installation of the fan equipment; disassembly and maintenance. The internal clearance of the bearing decreases with the increase of the fit tightness, and the lubricating film cannot be formed.08mm; due to the large span between the left and right bearings, it is difficult to avoid the deflection of the rotating shaft or the error of the bearing installation angle. and the eccentricity of the rotating uranium reaches 0. Generally, the adapter sleeve bearing taper hole is generally used in the design.