Kiln axis
The axis of the kiln in a vertical plane is directly related to the value of the under-tire clearance and temperature distribution. In the case of changes of temperature distribution of the kiln, both the axis position and the value of clearance is not constant. Besides, any change in position of the axis in the vertical plane causes different load distribution on support rollers bearings. That is why it is recommended to keep correct kiln shell temperature.
Correct kiln axis geometry is responsible for the even distribution of weight, coating, brick lining, components for all the supports. Alignment of the kiln in vertical plane ensures proper load on each individual support, but alignment in the horizontal plane ensure equal distribution on left and right rollers.
Consequently, any changes in the geometry of the kiln axis over time cause changes in the load distribution and thereby change the longitudinal bending stress distribution in the kiln shell. Such load changes are closely related to the kiln stiffness (the relation between the diameter, shell thickness and distance between supports etc.) may involve the risk of failure or reduced service life of the kiln components. Frequent checks of the kiln axis position are recommended as an integral part of the kiln maintenance.
To properly assess the impact of the axis geometry to the kiln operation, you need a detailed knowledge of the mechanical stiffness of the kiln shell and the current status of components on the supports. Mechanical condition of kiln must be carefully examined. In addition, the position of kiln axis must be measured during normal operation (in hot condition).