METHOD OF CRUSHING ROCK COMPOSITION Russian patent published in 1994 - IPC

FIELD: crushing plants. SUBSTANCE: two-roll toothed crusher has movable and motionless crushing rolls 13 and 14 mounted for forming exit slit being equal to S. Rock composition 33 which has large-sized lumps 34 is advanced into crusher by conveyer 9. When large-sized lumps 34 approach to crusher the exit slit of the crusher is abruptly increased to width of S_max by means of mechanism for forced moving of rolls apart. This width excess initial one several times; as a result, rolls clamp large-sized limps 34 and they are crushed. In this case conveyer 9 is retarded and stopped when large-sized lump 34 approaches unloading panel (till working area of crushing zone is released completely from material to be crushed). Then conveyer 9 is turned on again for short time till large-sized lump 34 is clamped by crushing zone. After that conveyer 9 is turned off till this lump is crushed completely and size of exit slit is reduced to initial width S. The method may be used with application of two-roll toothed crushers, rotary crusher and other types of crushers. EFFECT: improved efficiency. 3 cl, 16 dwg