A distinct class of roll crushers is referred to as ‘sizers.’ these are more heavily constructed units with slower rotation, and direct drive of the rolls rather than belt drives. they have a lower profile, allowing material to be easily fed by loaders, and are a good choice for portable crushers at the mine that reduce the coal in size for conveying to the preparation.According to the number of rolls, the roll crushers can be divided into single roll crusher, double roll crusher or, four roll crusher. double roll crusher is the most used type. we produce industrial roller crushers and laboratory uses small roll crusher. 【advantages】 replacement wear-resistant lining, long service life, convenient.