Mounting method for heavy-weight rotor and spherical bearings of long coupling unit

The invention belongs to the technical field of mechanical mounting, and discloses a mounting method for a heavy-weight rotor and spherical bearings of a long coupling unit. The mounting method comprises the following steps that S1, circular arc faces of bearing box bodies are ground by using circular arc faces of bush backs of the spherical bearings until the contact area ratio of the bush backsof the spherical bearings to the spherical arc faces of the bearing box bodies is more than or equal to 75%; S2, the spherical bearing are arranged back, and interference data are controlled to be within the range of 0-0.03 mm; S3, the rotor is arranged, then clearances between the rotor and four corners of the spherical bearings are actually measured, and clearances between four corner positionsof the bearings and the shaft diameter of the rotor are adjusted to be uniform by adjusting the front, back, left and right positions of the bearings; S4, a coupler is arranged, the front, back, leftand right positions of the