Animal feed consists of different ingredients to make a balanced diet in terms of proteins, carbohydrates, fats, vitamins, minerals and medicines etc.
Basic Hammer Mill Design
A typical hammer mill consists of a horizontal rotor assembly fitted inside a metal housing. The rotor assembly includes a shaft and several circular plates mounted on it with equal spaces between plates. Plates are having holes on its outer PCD to accommodate hammer pins on which swinging hammers are fitted. A perforated metal screen is forming either a full circle or half circle fits around the rotor assembly. The diameter of hole in screen is selected to match the desired particle size.
A material inlet is typically located at the housing top and a material outlet is located below the housing. A flow deflector is mounted below the material inlet to deflect the material either way to assist grinding.
The Grinding Theory
The product enter from the top of hammer mill, fall at a moving speed of 30 to 60 ft per minute. The product comes in contact with very high speed moving hammers at the top of their swing. The entering product can be assumed almost stationery as compare to very high tip speed of hammers. Due to huge difference in relative speed of each other, when contact is made, due to high impact force product is shattered in particles.
After this action, hammers begin to pull material into acceleration zone where the particles will increase in velocity to attain hammer tip speed. As soon as the particles attain the exit velocity, they are thrown out of grinding chamber.