Specification :

http: / / www.zcrusher.com/ double-roll-crusher.html
Roll Crushers are compression type crushers, and were once widely used in mining. They have, within the last 10 or so years, fallen into dis-favor among mining and processing companies. The probable reason is because the large mines require very large crushed product output with minimal cost, makes the roll crusher uncompetitive. The roll crushers are not nearly as productive as cone crushers, with respect to volume, and they do have a little higher maintenance associated with them. Roll crushers do, however, give a very close product size distribution, and if the ore is not too abrasive, they do not have high maintenance costs. Roll crusher is mainly used for the crushing of medium or lower-hardness mines and rocks with medium or lower rigidity in mine selection, chemicals, cement and building materials industrial production.

Roll crushers have a theoretical maximum reduction ratio of 4: 1. If a 2 inch particle is fed to the roll crusher the absolute smallest size one could expect from the crusher is 1/ 2 inch. Roll crushers will only crush material down to a minimum particle size of about 10 Mesh ( 2 mm) . A roll crusher crushes using compression, with two rolls rotating about a shaft, towards the gap between the rolls. The gap between the rolls is set to the size of product desired, with the realization that the largest feed particle can only be 4 times the gap dimension.