Designs of modern pellet presses

Abstract

According to the design, granulator presses can be with a flat matrix, with a round matrix, with two vertical rotating matrices, a hybrid of a granulator with a flat and round matrix. In granulators with a flat rotating horizontal matrix, the material is pressed through holes in it by pressing rollers and formed into granules. The main elements of the press are rollers fixed on the drive shaft and a flat matrix. Such granulators are small in size, have a simple design, so they are suitable for enterprises with a small volume of processing, as well as private households. The disadvantages of this equipment include the fact that at a certain peripheral speed, the material is carried away to the periphery of the matrix under the action of centrifugal forces and, as a result, an uneven load on its working surface. Due to the difference in the angular velocities of the rollers, uneven wear of the surface of the matrix and rollers occurs. It is very difficult to achieve the same gap between all the rollers and the matrix. If one bearing in a roller fails, all bearings on the roller head are usually replaced. Repairing a flat die granulator will cost more than a round die granulator.