The bearing housing is the part of conveyor roller that connects the roller and the bearing called the “heart” of the roller. The offset of the bearing seat plays a decisive role in both the path and the rotational and rotational resistance of conveyor roller. If the position of the bearing house does not meet the requirements, it will cause the roller radial run-out indicators of tolerance, and because both ends of the bearing coaxial degree is not good, it will cause both sides of the bearing different shaft. To be assembled, will cause the roller to increase the rotational resistance of conveyor roller, not only reduces the service life, but also the entire belt conveyor operating power increases. Therefore, the assembly of the bearing belt is one of the key processes in the production process of the belt conveyor roller. In order to solve this problem, to ensure that the roller bearing housing position and the two sides of the bearing coaxial degree,the manufacturer should select the qualified roller with steel tube roller, select the qualified bearing, and bearing housing.