The commonly seen roller crusher falls into three types single roll crusher, double roll crusher and four roll crusher. In the working process, material falls in between the two rollers, and will be crushed. Normally, the material will be discharged from the bottom.Features Quicker mill access with upper housing pivot feature. Feed hopper stays bolted to upper housing to provide quick access for liner change and rotor removal. Grate bar rack extracts out of the bottom housing for easy grate changeout. Uses same existing foundation holes and same rotor assembly as old-style ringmills.