A primary impact crusher is an industrial machine designed to break down large rocks, stones, or other hard materials. It is commonly used in primary crushing stages in mining, construction, and recycling industries. Its working principle relies on impact crushing, where kinetic energy is converted into mechanical force to fracture materials.

How Does It Work?

  1. Feeding and Rotor: Material is fed into the crusher through a hopper. A high-speed rotor equipped with hammers (or blow bars) strikes the incoming material.

  2. Impact and Fragmentation: The rotor’s rotational speed propels the material against impact plates (fixed or adjustable), where it shatters upon impact. The combined force of direct hammer strikes and collisions with the plates achieves fragmentation.

  3. Grinding and Size Control: Crushed material is further reduced in size in the grinding zone between the rotor and plates. The final particle size is regulated by adjustable grates or screens at the crusher’s discharge end.

  4. Discharge: Material meeting the desired size exits the crusher.

Advantages:

  • High reduction ratio.

  • Efficient for hard and abrasive materials.

  • Adjustable output size.

Applications:

  • Quarries and mines.

  • Concrete and asphalt recycling.

  • Cement production.