The lining plate is mainly used to protect the cylinder body, so that the cylinder body from the direct impact and grinding of abrasive body and material; At the same time, different forms of linings can be used to adjust The motion state of the grinding body in each bin.
The grinding process of the material is: the particle size of the first bin is larger, and the abrasive body is mainly required to impact, and the abrasive body should be in the state of dropping, so the powder is ground The bin lining plate has higher lifting ability to the abrasive body and should have good impact resistance; After each bin material granularity decreases in turn, to make When the product is ground to the required fineness, the grinding body shall successively enhance the grinding action, that is, the grinding body shall produce rolling and sliding, that is, the grinding body shall show Falling state, so the lining board is required to have good wear resistance. Because the motion state of the grinding body depends on the rotational speed of the grinding barrel, the powder grinding
The process requires the grinding body in each bin to move in different states, which is contradictory to the grinding barrel having the same rotational speed. The solution to this contradiction is profit With different shape surface liner, to change the motion of the grinding body, to meet the requirements of the material grinding process, so as to improve the grinding efficiency, Increase output and reduce metal consumption.
Most of the ball mill linings are made of metal materials, but also a small number of non-metallic materials. Because the motion state of the grinding body in each bin is different, it is suitable In response to the requirements of this working state, the materials of each bin lining board are different. In the crushing bin, the abrasive body is mainly impacted, and the lining board is required to have impact resistance and wear resistance. High manganese steel (ZGMn13) Lining material, it has a certain impact toughness, and when subjected to a certain impact, its surface produces cold hardening, the surface becomes hard Wear resistance, general hardness in HB300-350, toughness is quite high, impact value can be reached 700Nm/cm2. But in use, it is easy to reverse convex bending prematurely Shape, pull off the fixed bolt, causing the lining plate to fall off, so that the life of the general average life in 5000-6000h .High chromium cast iron has high hardness and good wear resistance, ranking first in wear-resistant materials. High chromium cast iron is a brittle material, but it can be made with proper treatment Make coarse grinding bin liner.General high chromium cast iron is used for small impact conditions,Such as coal mill lining board and crusher lining board(anti-wear plate), etc.Wear resistance of high manganese steel is improved 6-8Times, The economic benefits are significant. High chromium cast iron, such as grate plate and grinding head liner, should not be used for complex mill structure and large thin-walled pieces. Now high chromium casting Iron has been developed in four grades, in order to improve toughness followed by the emergence of high chromium cast steel and other materials.
