Tertiary Crusher (Sand Making Machine) is a type of crusher used in the final stage of aggregate production, specifically designed to produce fine materials (sand, small-sized aggregates). It further crushes materials processed by primary and secondary crushers to create cubic-shaped, high-quality aggregates. This machine is ideal for producing materials for concrete, asphalt, plaster, and prefabricated structures.

Working Principle:

  • Tertiary crushers operate using a high-speed rotating rotor and impact plates (hammers or blow bars) attached to the rotor.

  • Material from the secondary crusher is fed into the rotor. The rotor’s speed (70-100 m/s) causes the material to collide with the impact plates or be compressed between the rotor and fixed plates, breaking it into smaller pieces.

  • Crushed material is screened through vibrating sieves to separate it into desired sizes (0-5 mm or 0-10 mm) as sand or fine aggregates.

Key Components:

  • Rotor: Made of high-strength steel, it is the central shaft where impact plates are mounted.

  • Impact Plates (Hammers): Wear-resistant alloy steel components that crush the material.

  • Crushing Chamber: Enclosed space with adjustable settings to control particle size.

  • Screening System: Vibrating screens classify crushed material by size.

Advantages:

  • Cubic-Shaped Aggregates: High rotor speed produces angular, uniform particles, enhancing concrete strength.

  • Fine Sand Production: Generates high-quality construction sand (0-5 mm).

  • Energy Efficiency: Modern designs offer high capacity with low energy consumption.

  • Adjustable Output: Particle size can be modified by changing screen gaps or rotor speed.

Applications:

  • Fine aggregates for concrete and asphalt.

  • Plaster and screed sand.

  • Prefabricated building components.

  • Railway ballast and drainage materials.