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Pulley Magnets

The Pulley Magnet replaces the standard head pulley of a conveyor to provide continuous separation of tramp metal from a conveyed product.  A Pulley Magnet is simple to install and requires minimal maintenance.  The separation of ferrous metals is automatic, with discharge and collection taking place under the pulley.  An ideal solution for installations with limited space.

Description

The Pulley Magnet replaces the head pulley of a conveyor and is available as either a Permanent or Electro model.  In both designs, the magnetic field covers the entire 360-degree circumference of the pulley, ensuring that conveyed material is fully exposed to the magnetic extraction force at all times.

The Pulley Magnets are custom built and available in a wide range of diameters and face widths.  The diameter and width of the pulley is determined by the installation and application.

Pulley Magnets are also commonly used as a second stage metal separator, specifically for high levels of ferrous metal recovery or non-magnetic material purity.

As the magnetic option replaces the main head pulley of a conveyor, Pulley Magnets are often supplied with a rubber lagging.  The thickness and design of the lagging is agreed for each application.

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Operation

In operation, conveyed material is transported towards the discharge end of a conveyor and into the deep magnetic field of the Pulley Magnet.  Tramp ferrous metal is attracted and held onto the surface of the moving belt.  On the conveyor’s return, the tramp ferrous metal is moved out of the magnetic field, beyond the centre line of the pulley, and falls, under gravity, into a designated collection area.  In some installations, a non-magnetic adjustable diverter plate is positioned beneath the pulley to ensure a clean split between the product and the separated metal.

Models

Pulley Magnets are available in a wide range of diameters and widths to suit a wide variety of applications and installations.  The magnetic field is either produced using permanent magnets or an electromagnetic coil.

Permanent Pulley Magnets

Ideal for applications requiring the separation of nails, screws and bolt-sized tramp ferrous metal contamination.  The permanent magnet is either constructed from standard-strength Ceramic Ferrite or high-strength Rare Earth magnets.  Ceramic Ferrite models produce deep magnetic fields and are ideal for larger tramp metal separation, whilst the field of the Rare Earth design is shallower but the additional magnetic force enables the capture of smaller ferrous metal particles.

In both designs, each of the permanent magnetic blocks are individually mounted onto a high permeability steel back bar and fitted with a heavy-duty stainless-steel crowned face cover.

Electro Pulley Magnets

Electro Pulley Magnets are ideally suited for the separation of larger or heavier ferrous metals.  The extremely heavy-duty design suits difficult and arduous environments such as found in mining and recycling operations.  The internal electromagnetic coils are mounted on thick shafts and revolve with the pulley to ensure that the conveyed product is exposed to the strong magnetic field at all times when energised.

A transformer rectifier set is supplied with the Electro Pulley Magnet.  For applications where there is a need for selective separation, an optional transformer rectifier set is available with a variable DC voltage (from zero to full voltage).

Applications

Pulley Magnets are extremely versatile and are used in a wide range of applications in different industries.  These include:

  • Recycling:
    • Within MRF (Material Recovery Facility) operations
    • Cleansing wood, especially recycling wood, of nails, screws, etc
    • Recovering ferrous metals in municipal solid waste recovery plants
    • Removing ferrous contamination from Cullet (crushed recycled glass)
    • Recovery of ferrous metals from kerbside collected waste
    • Separation of ferrous metals in skip waste recycling
    • Ferrous metal recovery from steel slag
  • Quarrying & Mining
    • Installation on Mobile Crushers, Screens and Shredders
    • In quarries and mining operations to protect crushers and screens
  • Foundries:
    • In metal foundries to either reclaim ferrous metals or clean sand for reuse;
  • Food
    • Removing ferrous metal contamination from conveyed grain and dry granular foodstuffs;