Improper installation causes misalignment of the coupling and non levelness of the bearing seat. The alignment of the coupling or split bearing seat is not adjusted well, and the alignment accuracy is poor. The bearing of vertical roller mill is in a distorted state in the initial state.

The alignment of the coupling shall be in accordance with the requirements of the general code for construction and acceptance of mechanical equipment installation engineering (gb50231-2009), determine the maximum allowable value of radial displacement and inclination according to the diameter of the coupling, and correct it according to this value.

During installation, the free end bearing does not leave enough thermal expansion, so that this end bearing cannot extend freely during operation, resulting in the bearing bearing bearing large axial force, heating and even burning out.