A surfacing roller sleeve of a bowl coal mill and a method of sectional surfacing of a roller sleeve surfacing layer thereof

摘要

The present invention disclosed an overlaid grinding roll of bowl mill, comprising a conical rollbody with two ends, one big and the other small. Each end of the rollbody is provided with an annular boss, respectively, with the height of the boss at the big end greater than that of the boss at the small end; the rollbody is provided on its outer surface with an overlaid layer; the roll overlaid layer extends from the boss at the big end to the boss at the small end; the roll overlaid layer is divided into four sections, and the sum of the first overlaid section at the big end of the roll body and the axial dimension of the boss at the big end occupies 113 of the axial dimension of the roll body. The present invention, in accordance with the actual wear characteristics of the grinding roll of bowl mill in grinding raw coal containing more coal ore, pyrite, quartz sand and so on, reasonably determines the shape of the roll overlaid layer, and uses the method of sectional overlaying welding, giving full play to the wear resistance of overlay materials, thereby effectively extending service life of the roll wear parts of the bowl mill. The present invention further discloses a method of sectional overlaying welding of the roll overlaid layer.