This is the second post in a two-part series about kiln lubrication – specifically less-often discussed components. Last week, we covered trunnion wheel support bearings and the trunnion wheel riding ring interface. This week, we’ll cover the riding ring and the thrust roller.
The kiln riding ring, also called the rotary kiln tire, supports the weight of the kiln and helps to increase the rigidity of the shell. During kiln operation, the inner-diameter of the riding ring must be lubricated as the kiln shell and riding ring rotate at different rates. This rotational difference is called “creep” and results in sliding contact between the shell and riding ring.
The sliding motion that predominates during creep creates friction, and may result in increased heat and wear, causing weld fractures. Lubricants used to reduce this possibility include:
The residual colloid has an auto-ignition point of up to 530⁰C, so it can withstand most kiln shell temperatures and has proven effective in reducing friction related heat and wear. Typically four colloidal bars are required per kiln riding ring and are applied once a week. The spray requires several gallons per application and is reapplied every two days.
One word of caution: kilns operate in a contaminant rich environment. It is advisable to clean the area between the riding ring and the shell during each shutdown. Removing the old colloid prevents contaminated lubricant from becoming impregnated with debris, resulting in lapping wear. Fresh lubricant should be applied once the cleaning process is complete.
The Thrust Roller
Kilns are installed at an incline, and as a result are subjected to a downward or thrust movement. This movement must be limited and is controlled by a thrust roller. Though applied separately, the thrust roller uses the same lubricants as the trunnion wheel roller and support bearings.
The thrust roller bearing requires either grease or oil:
To summarize, in this tip series, we have covered lubrication of the riding ring, trunnion wheel, trunnion support bearings and the thrust bearing. Thanks for the opportunity to provide a little bit of knowledge. I hope you enjoyed this tip, and “Like” this post if you found it useful!
Yes - cement and paper as well.
For the first time I see this structure in a Fertilizer factory, does it could be used in another industries?
Thanks so much
Good guide article to help which is suitable lubricant for an Oven, and its parts as Support ring, stump wheel, stump support Bearings and thrust bearing, one question has to be performed calculations for these components.