Impact Crushers are used as primary and secondary crushers for crushing medium and low hardness stones. They crush the stone by impact and bump with rotor and breaker plate system.
What Are Impact Crushers and How Do They Work?
In an impact crusher, blow bars mounted on a high-speed rotor strike the material and throw it against impact aprons. The material is broken both by the blow bars and by impact against the aprons; product size is set by apron gap and rotor speed.
Offering a high reduction ratio and cubical particle shape, impact crushers are economical especially in limestone, dolomite and concrete recycling. In hard rock with high silica content, wear parts are consumed quickly.
Applications
- Primary or secondary crushing in limestone and dolomite quarries
- Cubical chippings and asphalt aggregate production
- Concrete, asphalt and demolition waste recycling
- Cement and lime raw material preparation
Selection Checklist
- Material abrasiveness (silica content) determines wear cost
- Rotor diameter and width chosen for capacity and feed size
- Blow bar material (manganese, martensitic, chrome, ceramic) suited to the application
- Apron adjustment and housing liners designed for easy maintenance
Main Spare Parts for Impact Crushers
Frequently Asked Questions
Where should an impact crusher not be used?
In hard, abrasive rock with high silica such as basalt, granite and quartzite the wear cost becomes very high; jaw and cone crushers are preferred there.
When should blow bars be turned?
When one edge is worn and product size starts to grow, blow bars are turned; opposite bars are replaced together to keep the rotor balanced.
Detailed guides: what is an impact crusher, impact crusher spare parts, wear part materials.