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Why to use a Hammer Mill
In industry where we need to reduce the particle size of a product so as to use it effectively, we use different machines to solve the purpose which include hammer mills, grinders, roller mill's etc.

In hammer mills impact force of high speed rotating hammer is utilized to crush a material.

Though our Hammer mills are being used in many industries with different design features, here we will discuss regarding hammer mills being used in animal feed industry.

Animal feed consists of different ingredients to make a balanced diet in terms of proteins, carbohydrates, fats, vitamins, minerals and medicines etc. There are few ingredients which are already available in powder form while the others like grains and cakes (by products of oil extraction plants from soya, groundnuts, mustard etc) need to be reduced to the required particle size to help to achieve to following :
Expose greater surface area for digesting.
Improve ease of handling of some ingredients.
Improve mixing characteristic of ingredients.
Increase Pelleting efficiency and pellet quality.
 
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 the 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.
 

Different designs are available from Half circle Grinders to modern Full circle Hammer mill.

 
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