The flexible shaft coupling consists of two half couplings, an outer casing, and several non-metallic elastic pins. The pins are inserted into the mating holes formed by the arc teeth of the half couplings and the inner arc teeth on the outer ring, to connect the two halves of the couplings.

Ball mills are one of the widely used high-fine grinding machines in industrial production, with various types available. They can be categorized into grid type and overflow type based on the discharge method. According to the shape of the cylinder, they are divided into four types: short cylinder ball mill, long cylinder ball mill, tube mill, and cone mill.