Common Factors Affecting Roller Bearing Life

For the vertical mill, the roller is the heart of vertical grinding, and roller bearings is the heart of roller, the normal work of roller bearing is the key to reliable operation of vertical mill. Extending its life has been the concern issue for the user and the designer. Zhengzhou mining machinery co.ltd, in production practice, summed up the factors affecting roller bearing life mainly in the following areas: the bearing itself, bearing the use of the operation of the mill, the bearing storage and so on.

1.1 The bearing itself
Bearing materials, heat treatment process, as well as its strength and wear resistance, surface structure, internal geometry, etc. will affect the bearing life. For users and designers, should understand the bearing conditions and load conditions, in the selection of bearings should provide the relevant parameters and conditions, bearing the specific issues can be considered by the bearing manufacturers.

1.2 The usage of bearings
In the usage of bearing, the user can subjective control aspects, but also affect the key of bearing life, from the installation to the specific operation and maintenance of all aspects of the penetration of the factors affecting bearing life.

Installation: Roller bearing installation quality is an important factor affecting its service life, a lot of roller bearings are premature failure or damage associated with improper assembly. Users must be in strict accordance with the requirements of the specification in the replacement of roller, too loose or too tight will cause the roller bearing damage in advance.

Uses: mainly include sealing, lubrication and monitoring.
Sealing also has a great impact on the bearing life. The role of sealing is to prevent oil leakage from the bearing outward, while preventing dust into the outside world. In the dusty working environment, if a large number of tiny hard particles into the vertical grinding roller bearing internal will deteriorate the bearing working environment and reduce the lubrication effect, and even the formation of indentation in the raceway surface, causing pitting and even rolling surface peeling, reduce the working life of bearings. Therefore, the choice of high reliability of the sealing components, to improve the bearing life is essential. Grinding roller bearings are sealed in the form of wind, which is compressed air to prevent the grinding chamber of dust into the bearing lubricants. Seal the wind to have a certain pressure, while the air ring Department of the gap cannot be too large for the MLS vertical mill, the sealing air pressure to reach more than 5000Pa, air ring gap is less than 3 ~ 5mm, to ensure that the wind ring at 50m / S or more, can play an effective sealing effect.

1.3 Mill operation condition
Mill vibration will affect the life of the bearing, so in the mill operation should reduce vibration, especially the level of vibration, roller bearings for the good operation to provide reliable protection. MLS vertical mill loading mode for the pressure frame concentrated load, with the disc rotation, the pressure at the frame will produce a horizontal tangential additional force, so for large vertical mill, where are added a buffer device, the buffer device is effective work is the key to reducing horizontal vibration.