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Design and Fabrication Of Hammer Mill Mechanical Project

Hammer Mill Project:

ABSTRACT

The objective of this project is to carry out a design fabrication and testing of a hammer mill, which will be used for grinding agricultural produce and mineral resources . The profile of the throat of the machine is redesigned to give better performance that was hot nit achieve when the machine was carrying the straight profile. Further more, the hammer was redesign to twisted type as against the straight hammer it was carrying formality. To achieve a better result, the sieve changing profile is redesigned to sliding type. This again allow for optimum productivity because the time consumed for changing the sieve is reduced to minimum.

The study of project deals with the hammer mills employing a high speed rotating disc, to which an ‘n’ number of hammer bars are fixed and swung outwards by centrifugal forces.Material is fed in, either at the top or at the Centre, and it is thrown out centrifugally and crushed between the hammer bars or against breaker plates fixed around the periphery of the cylindrical casing.

For high production of crushed coal it is better to use the hammer mills having higher contact surface of hammer. Hence, it is easy to produce the high rate of crushing coal with in less time.The purpose of the crushing is to produce the coal having size of less than 3mm (More than 3mm) and the moisture content is 10-12 percent .The type of hammer mill used is a Reversible swing hammer with open Bottom.The project involves the changing of hammer head, which gives the better crushing of coal. Therefore by changing the design of the Hammer head ,the following result is obtained

Hammer Mill
The hammer mill is an impact mill employing a high speed rotating disc, to which are fixed a number of hammer bars which are swung outwards by centrifugal force. Material is fed in, either at the top or at the Centre, and it is thrown out centrifugally and crushed by being beaten between the hammer bars, or against breaker plates fixed around the periphery of the cylindrical casing.

Design and Fabrication Of Hammer Mill Mechanical Project
Design and Fabrication Of Hammer Mill Mechanical Project
Crushing Process

The hammer mill crushes by the collisions between high-speed hammer and material, and the hammer crusher features in its simple structure, high reduction ration, high efficiency, etc. The PC hammer crush (hammer mill) was developed for both dry and wet crushing of brittle,medium-hard materials for the mining, cement, coal, metallurgic, construction material, road building, and petroleum and chemical industries.

Hammer Mill Features
  1. Material is reduced by impact from free-swinging bar hammers.
  2. Finished Product size controlled by grates or screen sizes.
  3. Materials can be reduced to granular powder at high rate.
  4. Heavy-duty cast-iron or carbon steel construction.
  5. Right-hand or left-hand machine available
  6. Easy access for maintenance and screen/grate change.
  7. High and constant capacity
  8. High availability
  9. Long life time
  10. High reduction ratio
  11. Broad range of application
  12. Easy replacement of wear and spare parts
The Types of Hammer Mill
  1. Super Hammer Mill
  2. Grinder-hammer Mill
  3. Pilot Hammer Mill
  4. The Precious Hammer Mills
Advantages
  1. High and constant capacity
  2. Low space requirement
  3. High machine availability
  4. Long lifetime
  5. Easy replacement of wear and spare parts through hydraulic opening device
  6. Broad range of applications
  7. High reduction ratio

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