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MSA Overbelt & Suspension Magnets

For efficient extraction of ferrous and tramp metals from conveyed product streams.

Suited to non-food related industries such as recycling and mining, overbelt and suspension magnets offer a safe, efficient, and effective method of removing ferrous tramp and iron pieces. The magnets are installed above conveyed product streams and extract contaminating ferrous and tramp metal as the belt proceeds past – thus improving product purity and reducing equipment damage.

Commonly extracted ferrous contaminants from these types of installations include nails, screws, nuts, bolts, wire, chain, hammers, and crowbars – all of which can cause thousands of dollars in equipment damage if not removed early in the process.

Advantages:

  • Improve product purity
  • Prevention of damage to expensive downstream machineries such as shredders, crushers, mills, pulverizers, and grinders
  • Prevention of damage, and the consequent costly repair and downtime, to conveyor belts cause by sharp metal pieces – this is especially a risk at discharge points
  • Low-maintenance and self-cleaning designs available

 

Cost benefits:

  • Reduction of downtime, maintenance, and repair costs to damaged downstream equipment, caused by the entry of tramp metal
  • Cost of product rejection through failure to remove metal inclusions
  • Potential savings from avoiding unnecessary landfill

 

Industries suited:

  • Mining operations including washeries
  • Recycling plants
  • Resource recovery
  • Plastic operation
  • Glass cullet recycling
  • Quarries
  • Shipping ports, ship loading
  • Fertilizer manufacturing
  • Power stations
  • Wood chip & timber waste recycling
  • Brickworks
  • Bulk materials handling & conveying
  • Mobile crushers, screens, & shredders
  • MRF (Material Recovery Facility) plants
  • Auto & appliances recycling
  • Municipal solid waste
  • Kerbside collection and skip waste recycling
  • Foundries
  • Tyre & rubber recycling
  • Electronics recycling/e-scrap
  • Shredded steel
  • Cement manufacturing
  • Concrete batching plants
  • Bulk sand and soil handling

 

Installation:

Overbelt and suspension magnets can be installed over the top of the conveyor (cross-belt style) or at the end of the conveyor at discharge location (inline style).

ELECTRO OR PERMANENT MAGNETS

Overbelt and suspension magnets are available in either permanent magnetic or electromagnetic designs. Each design has its own benefits and can include quick or self-cleaning methods.

 

ADVANTAGES OF ELECTRO-MAGNETS ADVANTAGES OF PERMANENT MAGNETS
  • Stronger magnetic field
  • Easy to clean
  • Can handle a heavier burden of material
  • Suited to high-tonnage, fast-flowing belts
  • Suited to deep troughed conveyors
  • Less expensive than electromagnets
  • Low install & operating costs
  • No power source required to operate
  • No electrical maintenance

 

OVERBELT MAGNETS

Overbelt Magnets consist of a magnet box surrounded by a continuously moving belt. The magnet is installed above the product stream conveyor, either mid-stream or at the conveyor discharge. As the product stream travels under the overbelt magnet, ferrous and tramp iron pieces are extracted and retained to the magnetic belt. The belt proceeds around the overbelt magnet housing. When it reaches the point at which it is no longer affected by the magnetic field, the collected metal is discharged and dropped off into collection bins.

Overbelt Magnets are popular due to their self-cleaning operation, which allows interrupted metal extraction and eliminates the need for operator cleaning schedules. They are also suited to applications where the typical level of ferrous contamination is high.

 

SUSPENSION MAGNETS

Suspension Magnets are a much simpler design than Overbelt Magnets. They consist of a block magnet (square, rectangular, or round) suspended above the conveyor with chains. The magnet face is positioned directly above the product stream, either cross-belt or inline (above conveyor discharge).

Regardless of whether Suspension Magnets are of permanent or electromagnetic design, there is usually manual labor involved in the cleaning process. The magnet must be shifted away from the conveyor before the collected metal is removed, otherwise, it may drop back into the product stream and cause recontamination. Because this manual labor is required, Suspension Magnets are typically selected for applications where the level of ferrous contamination is low and only occasional cleaning is required.

 

MAGNETIC PULLEYS

MSA also supply complete new magnetic pulley systems and magnetic pulley lagging for existing pulley magnets. These systems are installed at the discharge terminus of a conveyor and are used to effectively separate magnetic contaminants from the main non-magnetic product stream.

 

QUALITY AUSSIE-MADE MACHINES

Overbelt and Suspension Magnets available from MSA are high-quality, durable machines manufactured in Australia. They conform to current engineering standards and best practices. They are designed to provide low maintenance, effective metal separation.

Contact our magnet experts today for your magnetic needs!

Are you aware there are deep field and shallow field Lifting Magnets available?

Deep field (Passive Shunting) Lifting Magnets have been used for many decades in Australia. In the last ten years shallow field (Active Shunting) Lifting Magnets have been gaining in Popularity.

To understand why we need to look at the differences and what that means in the workplace.

Deep field magnets are generally durable robust pieces of equipment, but many people are not aware that they will only lift their advertised capacity at the depth of their magnetic field.

This depth varies between sizes. An average PML 500kg magnet has a 40mm deep field. This means it is only rated to lift 500kg if the material you are handling is 40mm thick. If the material is 20mm thick this 500kg magnet is rated to lift 350kg.  A 1-tonne deep field magnet typically has a 60mm deep field, so on 20mm material thickness, it is rated to lift 350kg which is the same as a PML 500kg magnet.

A shallow field magnet rated to lift 400kg has a 12.7mm deep field so it can lift 400kg of 12.7mm material. When you are handling 20mm plate it is still rated to lift 400kg.

Interestingly, most deep field magnets are not rated to lift material less than 10mm thick while many shallow field magnets are rated on material as thin as 0.5mm thick.

So, what that means in the workplace when you are using deep field magnets, is there is more potential to mismatch the magnet to the load.

A mismatch like using a 1-tonne PML with a 60mm field to lift 15mm plate will result in the lever being very hard to actuate and very hard to turn off. The lever will be very forceful on release resulting in a risk of wrist injuries.

Furthermore, a calculation is required by the operator to ensure the magnet is rated to lift the material at the given thickness.

Using a shallow field magnet on material from 0.5mm to 25mm thick will ensure that the levers actuate in a gentle manner, reducing potential wrist injuries while reducing the risk of operator error due to misunderstanding their magnets capacity on various thickness’s.

At MSA we supply both types and are looking forward to offering advice on which type suits your requirements.

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