1. Technical Differences
Working Principle
Working Principle
Hermetic Hammer Mill:
Utilizes high-speed rotary hammers to pulverize material.
Material is impacted by hammers and forced against a grinding plate or screen.
Impact Crusher:
Uses impact energy from a high-speed rotor with blow bars.
Material is thrown against impact plates, breaking into smaller pieces.
Design
Hermetic Hammer Mill:
Enclosed in hermetic (airtight) housing to prevent dust emissions.
Features swinging hammers and a perforated screen for size control.
Impact Crusher:
Solid rotor with rigid blow bars.
Vented housing with no screen material exits through designated openings.
Purpose
Hermetic Hammer Mill:
Suitable for fine and medium grinding of biomass, grains, and wood chips.
Ideal for materials needing dust containment or controlled processing.
Impact Crusher:
Designed for coarse and medium crushing of hard, brittle materials like coal.
Product Size and Adjustability
Hermetic Hammer Mill:
Output size controlled by changing the screen for fine to medium grind.
Impact Crusher:
Adjustable by altering the gap between rotor and impact plates for coarser output.
Material Suitability
Hermetic Hammer Mill:
Handles fibrous, soft, and light materials, effectively containing dust.
Impact Crusher:
Suitable for hard, brittle materials not ideal for fibrous or light materials.
Efficiency and Applications
Hermetic Hammer Mill:
Energy-efficient for softer materials, ideal for biomass or feed processing.
Impact Crusher:
Higher efficiency for hard materials like coal used in mining and heavy industries.
Environmental Control
Hermetic Hammer Mill:
Airtight housing contains dust emissions suitable for indoor environments.
Impact Crusher:
Requires external dust suppression systems.
2. Installing a Screen on an Impact Crusher
Screening Setup for Output Control
A screen can be installed on the output to control product size.
Common choice: Vibrating screen for sorting and creating multiple size fractions.
Benefits of Screening
Ensures consistent particle size distribution.
Recirculates oversized material for further crushing, improving efficiency.
Key Considerations
Select appropriate screen aperture size to meet product requirements.
Ensure crusher and screen capacities align to avoid bottlenecks.
Include dust control measures and consider automation for better workflow.
Applications
Useful for operations requiring strict sizing control and high-quality output.
