1 Tube wear mainly refers to the middle of the roller wear and breakage;
2 Bearing damage, mainly refers to the bearing can not be flexible, due to bearing point damage or serious rust caused;
3 Bending deformation, this kind of damage is very complicated, mainly manifested by the large bending deformation of the roller shaft, and the deflection angle of the roller shaft is too large, which will cause friction between the bearing seat and the shaft. In severe cases, the roller sealing ring will be damaged. ;
4 Other forms of damage, such as bearing out, bearing block and barrel splitting, desoldering, etc.