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- For the record label, see Hammermill Records.
A hammermill is a machine whose purpose is to shred or crush aggregate material into smaller pieces.
Structure of Hammer Mill
1)Foundation: it connects and supports all parts of the machine as a whole from which the pulverized materials can be discharged out. 2)Rotor: as the main moving part of the machine, it consists of main shaft, frame plates, hammer plates and bearings and it can run at a high speed. The dynamic balance inspection shall be done before the hammer plates are installed. 3)Operating door: to renew the sieve plate or hammer blades, the operating door shall be opened. Plus, the sieve plate is normally pressed by the operating door. 4)Upper main case: with feeding hole on the top and connecting foundation at the bottom, it also flanks with sieve plates and makes up a pulverizing chamber together with the rotor. 5)Feeding guide structure: the feedstock can be put in either from the left side of the inlet or its right side, and the rotating veer of the motor then can be automatically controlled by the travel switch to in line with the feeding direction.
Working Principle of Hammer Mill
The material can be put into the machine from the inlet and then under the influence of the guiding plate into the pulverizing cabin. Later on, the materials will be ground with the hammer plates striking and sieve plates friction at fast speed, at last, with the help of centrifugal force and air current, the pulverized materials will be discharged from the foundation through sieve holes.
These machines have many sorts of applications in many industries, including:
- Ethanol plants (corn)
- A farm machine, which mills grain into coarse flour to be fed to livestock
- Fluff pulp production
- Fruit juice production
- Grinding used shipping pallets for mulch
- Milling grain
- Sawmills, size reduction of trim scrap and planer shavings into boiler fuel or mulch
- Shredding paper
- Shredding scrap automobiles (see automotive shredder residue)
- Shredding yard and garden waste for composting
- Crushing large rocks
- In waste management
The basic principle is straightforward. A hammermill is essentially a steel drum containing a vertical or horizontal rotating shaft or drum on which hammers are mounted. The hammers are free to swing on the ends of the cross, or fixed to the central rotor. The rotor is spun at a high speed inside the drum while material is fed into a feed hopper. The material is impacted by the hammer bars and is thereby shredded and expelled through screens in the drum of a selected size.
The hammermill can be used as a primary, secondary, or tertiary crusher.
Small grain hammermills can be operated on household current. Large hammer mills used in automobile shredders may be driven by diesel or electric motors ranging from 2000 to over 5000 horsepower (1.5 - 3.7MW).
The Screenless hammer mill uses air flow to separate small particles from larger ones. It is designed to be more reliable, and is also claimed to be much cheaper and more energy efficient than regular hammermills.
- Blade grinder
- Trip hammer, which may be housed in a mill usually known as a forge, but which was historically occasionally described as a "hammermill".