PLANET MILL Russian patent published in 1995 - IPC

FIELD: fine and superfine grinding. SUBSTANCE: planet mill has housing with the base coupled with the bed by way of straddles and bolts, outer rigid friction race secured in the housing by bolts through dampers, and grinding drums 7. The bottom disk and top disk of the carrier are tensioned by fixed axles whereon fixed and multi-positioned rollers 11 are mounted. The rollers are constructed as an assembly of rings. Nuts is used for fixing rollers 11 with respect to axles 10 and grinding drums 7. Flanges arrest vertical vibration of grinding drums 7. The system for liquid lubrication includes pipes for supplying lubricant, seal, mud collector, passageways 28 and 29 for supplying lubricant made in fixed axles 10, grooves 30 made in driving rollers 11 interconnected through passageways 31 with working surfaces 15,16, 17, and 18 of driving rollers 11, drain passageway, sprayer, and passageway for supplying lubricant to it. Driving rollers 11 have working surfaces 15,16,17,18 which are arranged concentrically to the surface of grinding drums 7. The number of grooves 30 is equal to the number of working surfaces 15,16,17,18 (4 for this case). The lubricant is fed only to one of working surface 15 which is in direct contact with grinding drum 7. The lubricant is fed from the sprayer to working surface 18. After wearing out of working surface 15, driving rollers 11 turn to any direction by 90°. Next surface, which will be in contact with grinding drum 7, will be working surface 16 or 18. EFFECT: enhanced reliability. 4 cl, 3 dwg