The mixer shaft bearing mainly bears the radial force, followed by the axial force. Bearing selection can choose two kinds of bearings, can withstand the radial force can also support the axial force, such as angular contact ball bearings, tapered roller bearings or thrust roller bearings, angular contact is suitable for high-speed ball bearings. Conical roller bearing or ball bearing plus thrust dynamic bearing, used to determine the relative motion of the rotating shaft and other parts, in the guide parts play an auxiliary role or play a guiding part of the supporting role. Its main function is to support the mechanical rotating body, reduce the friction of the mechanical load coefficient in the transmission process. The friction properties of moving parts are different, and the bearing can be divided into rolling bearing and sliding bearing.