A roll crusher and a hammer mill are both types of equipment used for crushing materials, but they operate differently and are suitable for different types of applications.
Roll Crusher:
- Design: Roll crushers consist of two or more rotating cylinders (rolls). The material is fed between these rolls, which rotate in opposite directions to pull the material in and crush it through compression.
- Mechanism: Roll crushers primarily use compression force to break down materials. The material is pulled into the gap between the rolls, and the pressure exerted by the rolls crushes it.
- Output Size: The size of the crushed material can be adjusted by changing the distance between the rolls.
- Application: Roll crushers are suitable for relatively soft and friable materials, such as coal, limestone, clay, and certain types of ore. They are often used in aggregate production and mineral processing.
Hammer Mill:
- Design: A hammer mill consists of a rotating drum fitted with hammers (usually metal bars) that impact the material to break it apart. The drum is enclosed in a casing with openings through which the material is fed in and the crushed material exits.
- Mechanism: Hammer mills use high-speed impact force to shatter the material. The hammers strike the material repeatedly until it is small enough to pass through a screen or grate at the bottom.
- Output Size: The size of the particles produced by a hammer mill can be controlled by the size of the openings in the screen or grate.
- Application: Hammer mills are versatile and can handle hard, medium-hard, and soft materials, including grains, biomass, minerals, and waste materials. They are often used in the agricultural, industrial, and pharmaceutical sectors.
In summary, the primary differences are in the crushing mechanism (compression vs. impact), the types of materials they can handle, and their common applications. Roll crushers are better suited for relatively soft materials, while hammer mills are more versatile and can handle a wider range of material types and hardness.
