The bearing bush is a core sliding support wearing part of the entire drive and support system of a ball mill, and an exclusive matched bearing bush component for ball mills. It is divided into two core types: the spherical bearing bush (the core component of the mill main unit) and the motor bearing bush (the matched component for the drive system), which are installed at the cylinder support position of the ball mill main unit and the shafting position of the matched drive motor respectively. Together with the ball mill's hollow shaft, large gear ring, pinion gear, reducer and drive motor, it forms the dual-core "support-transmission" system of the entire mill unit. Through its core functions of sliding support, friction reduction and heat dissipation, it bears the heavy-duty rotational loads of the entire ball mill and its motor, and is adapted to the 24-hour continuous, wet and heavy-duty grinding working conditions in mining and mineral processing. As a dual-core basic matched component that ensures the stable rotation of the ball mill cylinder and the smooth power output of the drive motor, the material performance and processing precision of the bearing bush directly determine the operational stability of the ball mill, the continuity of grinding operations and the service life of the entire unit.