Impact plates are crucial components in stone crushers, especially in impact crushers and hammer crushers, where they absorb the impact of rocks and minerals during crushing. Here’s a detailed breakdown:
1. Function of Impact Plates
– Absorb and withstand high-impact forces from rocks.
– Help in shaping the final product size by controlling the rebound of material.
– Protect the crusher’s internal structure from wear.
2. Types of Impact Plates
– Primary Impact Plates – Directly face incoming material (high wear).
– Secondary/Curtain Plates – Further refine crushed material.
– Adjustable Plates – Allow setting changes for different output sizes.
3. Materials Used
Impact plates must be highly wear-resistant. Common materials include:
– High Manganese Steel (Mn13, Mn18, Mn22) – Tough and work-hardens under impact.
– High Chrome Iron (Cr20, Cr26, Cr28) – Excellent abrasion resistance but more brittle.
– Martensitic Steel (AR400, AR500) – Used in some modern designs for better wear life.
– Ceramic Inserts – Added for extreme abrasion resistance.
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4. Factors Affecting Wear & Longevity
– Material Hardness (e.g., granite vs. limestone).
– Feed Size & Speed – Larger or faster feed increases wear.
– Moisture & Abrasiveness – Wet or highly abrasive materials accelerate wear.
– Blow Bar & Rotor Speed – Higher speeds increase impact force.
5. Maintenance Tips
– Regularly inspect for cracks or excessive wear.
– Rotate or flip plates to extend lifespan (if double-sided).
– Replace before excessive wear causes damage to oth
components.
– Use proper alloy selection based on application.
6. Leading Manufacturers
Many companies produce high-quality impact plates, including:
– Metso
– Sandvik
– Terex
– Hazemag
– Magotteaux