The ball mill head which also called ball mill end cover or mill trunnion head for ball mill, sag mill and ag mill, which is the key steel casting parts for bearing load and transmitting power, and during long-term operation various problems will be occur .
The following is a detailed analysis of common problems for mill trunnion head:
 
1. Cracks or fractures in the end cover
Reasons:
Casting defects (pores, slag inclusions) or material fatigue; stress concentration caused by overload operation or frequent start-stop; uneven or loose bolt preload; residual stress after welding repair has not been eliminated.
 
2. Wear of bolt holes or bolt fractures
Reasons:
Bolts are not tightened in time after loosening, resulting in wear of the hole wall; bolt material does not meet the standard or preload is insufficient; the mating surface between the end cover and the cylinder flange is deformed.
 
3. Wear of the mating surface between the end cover and the ball mill hollow shaft
Reasons:
Poor lubrication leads to dry friction between the journal and the bearing; seal failure, slurry or dust intrusion into the mating surface; installation centering deviation (radial/axial runout tolerance).
 
4. Deformation of the ball mill end cover
Reason:
Long-term influence of alternating load or thermal stress; casting residual stress has not been completely eliminated; local overheating (such as bearing temperature rise transmission).
 
5. Seal failure and leakage
Reason:
Aging or wear of seals (such as rubber seals); corrosion of the end cover flange surface or damage to the sealing groove; excessive slurry pressure or particle erosion.
 
The solutions to the above problems for ball mill end cover will be shared in the next article.
   
If you have other problems with the ball mill steel casting parts during ball mill operation, such as girth gears, bearing seats, etc., please do not hesitate to contact us or leave a message. As the professional steel casting parts manufacturer, Tenfaye's technical engineers will give you detailed analysis as soon as possible.