Ball Mill Feed end cover

This paper details the ball mill feed end cover, a key component connecting the cylinder and feeding device, which guides materials into the cylinder, seals the cylinder end to prevent dust leakage, and forms a support structure with the hollow shaft. It requires strength and toughness, with Q235B and Q355B steel as common materials, featuring a disc or flanged structure with a central feed port and internal wear-resistant screw blades. The manufacturing process of large Q355B end covers is elaborated, including raw material pretreatment, cutting, forming, rough machining, welding (with post-heat treatment), finish machining (flange surface and feed port processing), and surface treatment. Comprehensive inspection procedures are also outlined, covering raw materials (chemical composition, mechanical properties), welding quality (non-destructive testing), dimensional accuracy (flange flatness, hole position tolerance), and final assembly compatibility and sealing performance tests. These ensure the feed end cover meets operational requirements, with a service life of 8-10 years, supporting stable feeding and sealed operation of the ball mill.