Buffer spiral rubber roller, easy installation, stable conveying self-centering, reduce conveyor belt deviation and protection features, especially for phosphate and compound fertilizer sticky wet materials transported.   Roller surface consists of a flexible plastic ring, installed in the feed point to the buffer material falling transport aircraft impact, the protection of the conveyor belt and roller from damage.   The buffer roller purposes: Buffer roller mounted on the conveyor by the the feed section below, reduce blanking material impact on the conveyor belt to extend its service life of the conveyor, the buffer roller spacing is generally 100-600 mm