In fact, the role of the liner in the mill is multi-faceted, not only to protect the simplicity of the grinding mill, but also to affect the motion state of the medium. According to the kinematic analysis of some grinding media, the effect of the media motion state on the grinding is decisive. In the autogenous pulverizer and the pebble mill, the shape of the lining plate and the height of the wave crest greatly affect the lifting height of the medium, which in turn affects the process of autogenous and pebble grinding.
The coordination of the height of the wave crest of the liner and the rotation speed can adjust the smooth progress of the self-grinding: when the rotation speed is high and the wave crest of the liner is also high, the medium fragmentation speed will exceed Shaanxi. Insufficient crushing force causes self-grinding to fail. The rough mill needs a large crushing force, and the medium should be lifted to a large height, so a non-smooth lining plate is used. On the contrary, the crushing force required by the fine mill is not large, the medium does not need to be lifted very high, and a smooth liner is often used.
It can be seen that the shape of the lining plate should be considered in combination with the requirements for the moving state of the medium. If the shape of the lining plate and the rotational speed of the grinding mill are well matched to make the moving state of the medium more suitable for the grinding requirements, more accurate results can be produced. The crushing force has a strong selective grinding effect.
The grading lining plate is spirally distributed along the axial direction of the grinding mill, so with the rotation of the cylinder, the small balls in the outer layer can be pushed to the discharge end, and the large balls in the center part also roll to the feeding end, resulting in the feeding end. Large balls are distributed at the mine end, and small balls are distributed at the discharge end. The distribution of steel balls tends to be reasonable, the crushing force tends to be accurate, and the selection of grinding action is naturally improved. This can not only reduce the over-grinding of materials and improve the selectivity of dissociation, but also increase the production capacity of the grinding mill by 10% to 15%.
The currently emerging angle spiral lining plate can not only play a certain role in grading the medium, but also fully mix the material and the medium, which is beneficial to the grinding effect. Therefore, although the volume of the mill is reduced after installing the angle spiral liner, the productivity of the grinding mill is still increased by 10% to 15%, and the power consumption is also reduced. It can be seen that the form of graded liner is preferable.