Pulley Magnets

The Pulley Magnet replaces the standard head pulley of a conveyor to provide continuous separation of disruptive tramp ferrous metal from a conveyed product.  A Pulley Magnet is simple to install and requires minimal maintenance.  The recovered ferrous metal is discharged at a collection place under the pulley.  An ideal solution if space is limited.

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 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 the highest demand of ferrous metal recovery or for securing the quality of non-magnetic material.

The Pulley Magnet is often supplied with a rubber lagging, as it replaces the main head pulley of a conveyor. The thickness and design of the lagging is dependent on the 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.  Disruptive 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 separation of the magnetic and non-magnetic fraction.

Models

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

Permanent Pulley Magnets

Ideal for applications requiring the removal of nails, screws and bolt-sized tramp ferrous metal.  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 the recovery of large tramp metal, whilst the magnetic field of the Rare Earth design is shallower but more intense, enabling the capture of small 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 waste wood containing 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
    • 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;