The lining is an important part of the ball mill equipment, and its function is to protect the cylinder and the end cover (plate) from being worn. The liner needs to be replaced periodically, so its construction should be easy to replace. The materials for manufacturing the lining are: metal materials (manganese steel, chrome steel, etc.) and rubber. At present, there are many domestic metal material linings, and rubber linings are also used in mines. It has obvious advantages.
The shape of the barrel liner has a great influence on the work of the ball mill. When handling coarse-grained materials, the lining of the ball mill cylinder should be undulating (such as wave shape, convex shape, lap shape and stage shape). This shape liner has the ability to raise the grinding media to a higher height, thereby enhancing the impact of the medium and increasing the productivity of the ball mill. Commonly used in the first stage of grinding.
Fine grinding (often referred to as the second stage of grinding) is mainly by grinding and stripping. The smooth lining is easy to slide the steel ball, and the grinding and peeling effect is strong. Therefore, the fine grinding ball barrel is mostly made of smooth lining. The type I, II and III linings shown in Figure 5-6 are screwed directly. On the cylinder, the IV and V-type liners are fixed by steel wedges and bolts, which have the advantage of being easy to install at the factory. The thickness of the liner is determined by the diameter of the ball mill, typically between 50 and 150 mm.
The strip lining of the ball mill cylinder, which is not bolted, but is fixed by extrusion of the end lining. The end cap (plate) liner is made of the same material as the ball mill liner liner, usually in the form of a fan. The hollow journal can be smooth and threaded on the inner surface of the sleeve. The thread of the hollow journal bushing of the mine end is used to transport the material to the ball mill and the reverse thread of the hollow journal bushing of the discharge end prevents the coarse material and the steel ball from being discharged. When the ore feeding capacity is large, the hollow shaft bushing of the ore end can be provided without a thread, because the thread will limit the amount of ore.