DRUM GRANULATOR Russian patent published in 2000 - IPC

FIELD: agriculture, in particular, production of mineral fertilizer. SUBSTANCE: drum granulator has main drum with conveying head provided with dispensing blades arranged on inner surface in several rows, retaining blades positioned in front of dispensing blades and supporting ring at drum outlet end. Granulator is further provided with auxiliary outer drum, return auger arranged between drums for rotation together with them, and product charging and discharge chambers. Main drum has classifier connected to both drums and classifier cleaner, which is secured in discharge chamber wall. Granulator has device for returning small fraction into main drum, nozzle and charging tube mounted on immovable part of charging chamber. Small fraction returning device is positioned within annular space between drums downstream of return auger and is made in the form of guiding-conveying blades positioned opposite feeding windows of main drum at inlet end of main drum. Granulator of such construction may be used for reprocessing of solid nonstandard product, such as mineral fertilizer, into first or second grade granulated product. EFFECT: increased efficiency, simplified construction and improved strength of granulated product. 2 dwg