Depending on the type of grinding required, two types of ball movement are distinguished:
- Cataract movement (grinding because of impact and friction)
- Cascade movement (grinding because of friction)
At the cataract movement balls are lifted higher and more balls are ejected from the surface at the top of the mill. These balls fall freely. Grinding takes place mainly because of the impact forces. Cataract movement is used for coarse grinding in the 1. compartment. Lifting liners in this compartment assist the cataract movement.
Cascade movement is used in the fine grinding compartment. The balls are carried up by friction and roll down at the surface. Grinding takes place mainly because of friction.
The movement of balls depends on:
- Mill speed
- Ball charge
- Liner shape
- Mill diameter
- Replace the lubricant within the specified period. The lubricating oil at the main bearing of the newly installed mill shall be completely renewed after the mill runs for 1 month.
- Regularly check the quality and quantity of lubricating oil, remove impurities in the oil, and replenish in time.
- Pay attention to the temperature change of the main bearing and hollow shaft at any time.
- Pay attention to whether there are abnormal vibration and noise in the operation of the equipment.
- Check the wear of lining plates in different parts frequently and replace them in time.
- Check the sealing condition of the machine and whether the bolt is loose.
| Wearing Part | Raw Material |
| Liner plate | ZGMn13 |
| Pinion | 35SiMn |
| Lifter blade | Q235A |
| Grate plate | ZGMn13 |
| Blind plate | ZGMn13 |
| Sieve plate | 1Cr8Ni9Ti |
| Bolt | Q235A |
