Roller structure is not reasonable, will have a far-reaching impact on the life, so we should pay more attention to the accuracy of the roller production, make good on roller.

The 1 sealing effect is not good. Roller adopts non-contact seal is axial labyrinth seal, its characteristic is, outer seal is formed between the twists and turns, a small gap to achieve sealing, dustproof effect is good, but the poor waterproof effect, ultimately affect the service life of the roller.

2 supporting coaxial roller difference. Idler shaft for drawing optical axis, using cold drawing axis is the surface roughness and size precision without processing can meet the requirements of the drawings, use convenient, labor-saving, but due to wear for the production of cold drawn axis factors causing instability, size precision often exceed the standard phenomenon, caused by the bending easily add in in the process of transportation, the coaxial degree difference roller bearing clearance, support installed at both ends of the roll shaft can not be guaranteed, thereby roller revolving resistance increases, affect the service life of the roller.

The 3 bearing seat coaxial degree difference. Roller bearing is used in stamping structure, not processed with the drum skin, bearing seat is directly welded on the drum skin, stamping bearings do not circle or and the drum skin at the matching end inequalities, are easy to cause the skin at the end and the cylinder with inequality, are easy to cause the welding and the drum skin after two ends of bearing different axis, resulting in reduction of bearing clearance, rotational resistance increases, the rotation is not flexible