A number of plausible mechanisms can explain kiln and dryer vibrations. The company explains eight common reasons and offers recommendations in a white paper on its website.
Possible causes include:
1. The transfer of load from one pinion tooth to the following tooth may have an impact component.
2. The helical design of gears guarantees smooth tooth-to-tooth load transfer because the load is shared by two adjacent teeth at the time of the load transfer.
3. Often, there is sufficient leverage on the pinion support mechanism to allow the pinion to move toward the kiln/dryer axis in response to pinion tooth pressure.
4. On a kiln, drive vibration can be caused by a shell dogleg condition on units with three or more piers.
5. Typically, resonance vibration only occurs if the tooth contact frequency is close to the resonance frequency of the kiln/dryer system.
6. The vibration frequency of a body is a function of the inverse of the square root of its weight.
7. If the kiln drive motor control system responds to a speed change in a time period that is close to the time interval between two adjacent gear teeth, drive load cycling can occur with resonance characteristics.
8. The maximum vibration amplitude at the peak of the condition can be so low that if one does not look for it, it goes undetected.
To learn more and download the white paper, visit http://www.industrialkiln.com/technical-reference.php and click on "Kiln and Dryer Vibration."
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