Ring-inlaid bull gear of mining excavator

A ring-inlaid bull gear of a mining excavator belongs to the technical field of gears and comprises a ring-inlaid gear ring, a ring-inlaid wheel core, an expansion sleeve and a fastener, the ring-inlaid wheel core is arranged in the ring-inlaid gear ring to be assembled into a whole, an expansion sleeve mounting hole is formed in the position, corresponding to the ring-inlaid gear ring, of the ring-inlaid wheel core, the expansion sleeve is arranged in the expansion sleeve mounting hole, and the fastener is arranged in the expansion sleeve mounting hole. A fastener mounting hole is formed in the position corresponding to the expansion sleeve mounting hole, a fastener is arranged in the fastener mounting hole, and the expansion sleeve comprises an upper wedge block, an expansion sleeve, a lower wedge block, an expansion sleeve bolt and an expansion sleeve nut. The embedded ring gear ring and the embedded ring wheel core are manufactured in a split mode, the expansion sleeve is adopted for expansion positioning