Principle of Hammer Mill:
Hammer Mill Operates on the principle of impact and attrition.
Material is fed into a grinding chamber where it is struck by hammers attached to a rotating shaft, resulting in size reduction through impact and shearing forces.
Construction:
Grinding Chamber: Cylindrical chamber where material is introduced.
Hammers: Swinging or fixed blades attached to a rotating shaft.
Screen: Perforated metal sheet allowing only particles of desired size to pass.
Feed Mechanism: Hopper for material input.
Discharge Mechanism: Outlet for processed material.
Working:
Material is fed into the chamber and struck by rapidly rotating hammers.
Size reduction occurs by impact and attrition.
Desired particle size is achieved by passing through the screen.
Processed material exits through the discharge mechanism.
Uses:
Size reduction of a wide range of materials including grains, spices, pharmaceuticals, and chemicals.
Merits:
Simple and robust construction.
High throughput and efficiency.
Capable of handling a wide variety of materials.
Demerits:
High noise levels.
Potential for high heat generation.
Wear and tear of hammers and screens.