At present, there are broken line shaped and circular arc shaped ultrafine vertical mill in the market. The angle of each stage of impact plate has a great influence on the effective crushing force of the material impacting the impact plate, and also has a great influence on the impact and shear crushing effect of the material.The broken line impact plate has a simple structure, but it can not guarantee the most effective impact crushing of ore. therefore, when purchasing and debugging the impact plate, we must pay attention to the angle of the impact plate, so that when the material collides with the impact plate, it can be perpendicular to the impact plate, so as to improve the production capacity of the impact plate.The arc-shaped impact plate is commonly used in involute linear structure. The characteristics of this structure are that at each point of the impact plate, the ore is impacted in the vertical direction, resulting in higher crushing efficiency and higher production capacity.