Roll Crushers / Crushing Rolls

Roll crushers are a compression or compression/shear type crusher mostly used in primary and secondary operations for limestone, coal, sedimentary, friable rock, non abrasive ores or wet sticky materials. Smooth roll crushers consist of a pair of horizontal cylindrical rolls, rotating in opposite directions. One roll is fixed and the other is floating but fixed with a preset amount of force to allow uncrushable bodies to pass. Material is pulled into the rotating rolls and the material is fractured and reduced by compressive forces down to the size of the gap between the rolls. These roll crushers should be starvation fed to prevent them from choking as well as being fed at an even rate across the width of the rolls. Smooth roll crushers are most often used for friable non abrasive ores. Other types of roll crushers include a single toothed roll facing a breaker plate or two toothed rolls. These crushers use a combination of compression and shear to reduce material size and are most often used for coal, coke, limestone or gypsum.

Roll crushers are not as widely used as in the past because they are slower than other primary crushing methods however they still have useful applications.

- Sandvik Mining and Construction images.