Main shaft integrated magnetic roller for magnetic separator and mounting method of main shaft integrated magnetic roller

The invention discloses a main shaft integrated magnetic roller for a magnetic separator. Comprising a bottom frame, a main shaft installed on the bottom frame through a bearing seat, two side plates installed on the main shaft through bearings, a barrel skin installed between the two side plates, a large gear installed on the barrel skin, a driving motor installed on a machine frame and a small gear arranged on an output shaft of the driving motor. The small gear is meshed with the large gear, the magnetic system is installed on the portion, between the two side plates, of the main shaft, the small gear is controlled by the driving motor to drive the large gear to rotate, then the roller skin is driven to rotate, and the adjusting mechanism controls the main shaft to rotate. The problems of short service life of a bearing, easy deformation of a barrel skin and low bearing capacity caused by a split type main shaft structure can be effectively solved, the large gear and the small gear can be prevented from be