A roller crusher is a type of compression crusher that is used to crush materials into smaller particles. It consists of two cylindrical rollers that rotate in opposite directions. As materials are fed into the gap between the rolls, they are crushed by the compressive forces exerted by the rotating rollers. Roller crushers are commonly used in mining, construction, and recycling industries to crush materials such as coal, limestone, mineral ores, and other bulk materials. They are valued for their simplicity, efficiency, and ability to produce uniform-sized particles.