Drum

The utility model discloses a roller which is a part used on a conveyer. The conveyer drives a conveyer belt to run through the rotation of a plurality of rollers. As viewed in an accompanying diagram, the roller is composed of a roller outer shell (1) and a cover (2), wherein the cover (2) is shaped into a protrusion by punching, and the center of the cover (2) is provided with a hole which is provided with the rotary shaft (6) inside. The rotary shaft (6) is provided with and is tightly matched with a bearing (3), and is provided with a sealing ring (4) and a pressed thread (5), wherein the bearing (3) is in tight fit with the cover (2) which is fixed with the roller outer shell (1) through screws (7). The cover (2) is formed by one-step punch molding, improved from being manufactured by cast iron. Meanwhile, the bearing (3) is fixed between the sealing ring (4) and the pressed thread (5), therefore the bearing (3) can not be easily removed. Besides, after the cover (2) is fixed with the outer shell (1), the firmness of the utility model in running is increased and replacing frequency is reduced. Therefore, the cost is reduced and the rotating reliability of the utility model is improved.