Idler Drums

The vast majority of idler drums used in cast link belt furnaces today are eleven inches in diameter and are smooth on the contact surface. Because their main function is to support the cast link belt on the charge end of the furnace and provide “take-up” pressure to the belt, the smooth surface is desired. If the belt is not stretched more on one side than the other, it should remain centered over the idler drum. If the belt is not uniform, if some hearth rolls are not aligned perpendicular to the belt or if some hearth rolls are not level, the belt will track to one side or the other. This can only be seen if the idler drum is smooth, thus it is the warning alarm that something is not right and must be fixed.

Some furnaces are fitted with a toothed idler drum so as to provide consistent uniform tracking. This is fine if all other measures have been taken to insure against the above problems. However, if the problems exist, the stress produced by those errors will be applied to the belt and damage will occur. The most prevalent problem is broken belt pins due to fatigue stress.

Idler drum construction is much the same as drive drum construction with trunnions inserted to the depth of one diameter. It is preferable to keep trunnion diameters to near the maximum of four inches so as to prevent metal fatigue due to take-up pressure.

Contact Us today with your heat resistant, high temperature, cast alloy furnace idler drum needs. We have the staff to help you select the correct standard parts, or to engineer and then fully cast the high quality alloy parts for your specific application.

Omega Castings, Inc.
301 Fritz Keiper Blvd.
Battle Creek, MI 49037
Phone: 269-968-8105
Fax: 269-968-1661



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