Every day, the Hammers Mills transform ferrous and non-ferrous materials into homogeneous, clean and easily separable fractions. Despite their daily use, many operators do not know how they work.
Understanding how a hammer mill works is essential for choosing the machine best suited to your needs, optimising productivity and improving the quality of the output material.
In this article, we take a close look at how the TAURUS Hammers millsworks.
The grinding chamber is the central element of the hammer mill, the point where the scrap metal is crushed. In the TAURUS REDMILL hammer mill, once the material reaches the grinding chamber, the scrap is struck by the free hammers hinged to the rotor and pushed against the anvil. The combined action of impact and friction progressively reduces the material until it reaches a particle size compatible with the upper and lower discharge grids.
How crushing takes place in the hammer mill
The scrap enters the mill and is immediately intercepted by the rotor, which rotates at high speed, causing the hammers to strike the material against the anvil. The process consists of three stages:
Pieces that are too large or particularly tough remain in the grinding chamber. For this reason, hammer mills are equipped with an emergency door to allow the immediate expulsion of non-crushable material, ensuring safety and operational continuity.
This hydraulically operated door is positioned vertically at the top of the grinding chamber, opposite the scrap inlet door.
The crushed material comes out of the grinding chamber through:
and is deposited on the vibratory outfeed plate.
The arrangement of the grids varies depending on the mill model.
Heavy Fraction e Light Fraction
During crushing, the grinding chamber and the spaces adjacent to the grids fill with two different fractions of material:
1. Heavy Fraction
Composta da metalli ferrosi, metalli non ferrosi e particolato pesante inerte (sassi, pezzi di pneumatici, ecc.). È la frazione destinata ai sistemi di separazione magnetica.
2. Light Fraction
It includes plastics, paints, textile fibres, glass fragments, rubber, wood, fumes, vapours and dust. This fraction, which contaminates the final product, must be removed using extraction, abatement and collection systems.
Magnetic Separation and Material Cleaning
From the vibrating plate under the grinding chamber, the heavy fraction proceeds to the cleaning and magnetic separation system, consisting of one or two magnetic drums (electromagnets).
Magnetic drum funcion:
Any unseparated iron–copper combinations must be removed manually, as they contaminate the final product, especially in scrap intended for copper recovery.
Non-magnetic material
The residual fraction, consisting of non-ferrous metals and inert heavy particulate matter, falls onto a second vibrating plate and is conveyed outside the module.
The quality of the crushing depends on the design of the grinding chamber and the efficiency of the separation systems. The TAURUS REDMILL hammer mill guarantees productivity, material purity and operational continuity, representing a reliable and high-performance solution for metal recycling.
TAURUS: Your Scrap Solution
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