The barrel is an important part of the vertical roller mill, and the price is relatively expensive. After the liner is installed in the barrel, the barrel will not directly bear the impact and grinding of the grinding medium and the material to be ground, thereby protecting the barrel and extending the barrel and the entire The service life of the equipment. The lining board and the cylinder body are tightly combined, and also play a role in enhancing the rigidity of the cylinder body.

Automatic grading linings such as angle spiral linings, cone grading linings, etc., can make the grinding bodies of different gradations in the cylinder, along the axial direction of the mill, according to the change of the grinding particle size, reasonably positively classify, so that various Grinding bodies of different diameters exert their greatest function in the process of crushing materials of corresponding particle sizes.

In other words, the automatic grading liner can gather the larger steel balls in the same grinding bin at the feed end of the bin to smash larger pieces of material, and at the same time make the smaller steel balls gather at the discharge end of the bin.