Roller Application: roller for a coal mine and the open air, coal preparation, etc. used in carrying on a belt conveyor idlers, return idlers and buffer roller. The main purpose is to support and drive belt, reducing the running resistance of conveyor idlers wholesale, and sag belt does not exceed certain limits in order to ensure the smooth operation of the conveyor belt. Roller Type Standard: roller conveyor is an important component of many kinds of conveyor idlers suppliers, large quantities. Role is supporting belts, reducing the belt running resistance, and the vertical of the belt does not exceed a certain limit in order to ensure the belt running smoothly. Roller according to their use are classified as self-aligning roller, buffer roller, roller trough, parallel rollers.