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MAGNETIC PULLEYS

A MAGNETIC PULLEY

Permanent (PMP) or electromagnetic pulleys (EMP) are iron separators that enable customers to automatize the extraction of ferrous metals from inert waste flow (eg. urban waste, WEEE, post-combustion slag, wood, etc.)

These separators can be installed onto an existing conveyor belt in replacement of a head pulley. Their installation does not involve any alteration to the conveying system. 

The pulleys are entirely magnetized and they attract the Fe intrusions to their surface. The ferrous material is held to the belt until it reaches the underside where it gets released into bins for collection.

Magnetic Pulleys: further details

  1. A Permanent magnetic pulley does not require an electrical panel to function. The sole component that has to be connected to a power supply system is the gearmotor;
  2. An electromagnetic pulley is supplied with a control panel with AC/DC transformer. 

 

HOW IS A MAGNETIC PULLEY MADE

Electromagnetic pulleys (EMP) and permanent magnetic pulleys (PMP) are made up of:

  • 1 through shaft in 304 stainless steel
  • n iron poles
  • n magnetic circuits on each iron pole
  • 2 ferrules that hold the entire magnetic field in place
puleggia magnetica

HOW DOES A MAGNETIC PULLEY WORK

Once the tramp iron contained in the product stream comes within the pulley’s magnetic field, it is attracted and held to the conveyor belt until it reaches the conveyor’s underside. Beyond the magnetic axis of the drum, the ferrous metal passes out the magnetic field and it is thus discharged into a collecting bin. The non-magnetic material, instead, is discharged over the pulley following a normal trajectory.  

The motor drives the pulley’s shaft which is placed onto oiled bearings. The existing belt should be provided with cleats orientated transversally to the direction of the waste flow so as to facilitate the conveying of tramp iron attracted by the pulley.

In case of a thick waste stream, we recommend installing further iron removers (eg. overband separators or manual overhead suspension magnets) over the conveyor belt so as to achieve maximum tramp iron removal.

MAGNETIC PULLEYS: TYPES AND DIMENSIONS

The size of the magnetic pulley can be adapted to the dimensions of the conveyor belt’s head pulley that it will replace. 

Depending on the size and weight of the ferrous material to be extracted, the magnetic field can be built using permanent Ferrite or Neodymium magnets. 

The stainless steel shaft of the pulley is dimensioned so as to be coupled with the motorization system installed onto the existing conveyor belt. 

Upon request, the magnetic pulley can be covered in a thin layer of smooth rubber to provide further grip on the belt while operating.

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