Separation System Minimises Meatball Hassles

Eriez Magnetics Europe has recently launched its P-Rex permanent magnetic scrap drum, a simple mechanical metal separator with no electricity requirements and low maintenance. According to Eriez, the separation system enables users to minimise meatball hassles and maximise revenue opportunities, while reducing the need for hand sorting. Meatballs are electric motors or armatures consisting of a spherical steel shell with copper windings inside, which are usually removed using large electro magnetic drums or by hand picking from the waste stream.

When drum magnets don't operate at peak performance, large sphere-shaped objects like meatballs can be near impossible to capture. Fragments of electric motors, alternators and other items containing copper, aluminium and steel are missed and money is lost. The P-Rex scrap drum is designed to solve this problem. With today's electromagnetic drum magnets, a steel core is used to project the magnetic field. These cores generate a limited magnetic force at the drum edge because the electric coil wound around the core takes up space across the width of the drum, resulting in weak zones at the edges.

These weak zones can amount to 20 per cent or more of the surface of the drum. Because the P-Rex is a permanent magnet, it extends to the edge of the drum, enabling wider and more efficient separation. Wider separation means greater profits through greater recovery. A further benefit of the P-Rex drum's permanent magnets regards temperature. Electro magnetic drums consume power and heat up when in use.

The higher the temperature, the greater the loss of magnetic strength, and in summer and hot climates this can be a problem. P-Rex's permanent magnets are engineered to maintain their strength. The drum uses no electricity and, according to Eriez, is very strong, with an attractive force that surpasses the largest electro drums on the market today. The company also claims that P-Rex drums outperform electro drums by more than 20 per cent during both hot and cold conditions.

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