A Horizontal Shaft Impact Crusher (HSI) is a crushing machine that uses a high-speed rotating rotor and impact plates to break materials. It is named for its horizontal shaft orientation. Ideal for medium-hard (limestone, dolomite) and hard materials (basalt, granite), it is also widely used in recycling applications (concrete, asphalt).

2. Purpose

  • Aggregate Production: Produces cubic-shaped aggregates for concrete and asphalt.

  • Size Reduction: Reduces material to fine fractions (e.g., 0-40 mm).

  • Recycling: Converts demolition waste into reusable raw materials.

  • High Efficiency: Combines primary and secondary crushing in a single rotor.

3. Working Principle

HSI crushers operate based on impact force and kinetic energy:

  1. Feeding: Material enters the crushing chamber via a hopper or conveyor.

  2. Rotor and Blow Bars: A horizontally mounted rotor spins at high speed (500-1000 RPM), accelerating material with blow bars (hammers).

  3. Impact and Fragmentation: Material is hurled against fixed or adjustable impact aprons, shattering upon collision.

  4. Screening and Recirculation: Integrated screens classify output; oversized particles return to the crushing chamber.

  5. Discharge: Sized material exits via a discharge conveyor.

Technical Specifications:

  • Rotor Diameter: 800 mm to 2000 mm (varies by capacity).

  • Motor Power: 150 kW to 600 kW.

  • Max Feed Size: 200 mm to 500 mm.

  • Output Size: 0-40 mm (adjustable).

4. Advantages

  • Cubic Product Shape: Enhances concrete strength due to angular aggregates.

  • Adjustable Output: Control particle size via apron gaps and rotor speed.

  • Low Operating Costs: Fewer wear parts and lower energy consumption than jaw or cone crushers.

  • Compact Design: Easily integrated into mobile or stationary plants.

5. Applications

  • Quarries: Crushing limestone, basalt, granite, and sandstone.

  • Cement and Aggregate Plants: Raw material preparation and clinker pre-crushing.

  • Recycling Facilities: Processing concrete, asphalt, and brick debris.

  • Mines: Pre-crushing iron ore, copper, and gold ores.

  • Construction Sites: On-site aggregate production and debris management.