Re: Metallic Debris On Belt Conveyors
Yes it works very well indeed. See Eiez Magnetics about overband tramp iron magnets. They spring to mind immediately & I hope I haven't offended the opposition. I have seen oil drums, safety boots & shovels stuck on the magnets & if I'd been quick enough I could have opened a car boot sale with what gets dumped & removed during conveying. ■
John Gateley johngateley@hotmail.com www.the-credible-bulk.com
Re: Metallic Debris On Belt Conveyors
Than you John for the reply ■
Re: Metallic Debris On Belt Conveyors
Dear Mr. Jack Hilbert
Use of magnets for removing tramp iron from the material being carried by moving belt, is a regular feature of many material handling system, since long time. These magnets are popularly known as below :
1) Permanent magnet. This uses permanent magnet which is suspended above belt. The attracted material remains stuck with the magnet, which is to be periodically removed as per the frequency of occurrence of tramp iron.
2) Cross belt electromagnetic separator : This has powerful electromagnet surrounded by belt loop which automatically extracts and dumps the tramp iron on one side of conveyor. This is placed across the belt.
3) In-line electromagnetic separator : This has powerful electromagnet surrounded by belt loop which automatically extracts and dumps the tramp iron on one end of the conveyor. This arrangement is placed over the discharge pulley of the conveyor.
4) Magnetic pulley : This can be of permanent magnet type or electromagnet type. Its location is discharge pulley.
Please refer the manufacturers of such items to know the relevant information.
The magnetic separator as above removes only ferrous (magnetic) items. In bulk material most of the contamination happens to be by steel item (bolts, nuts, spanners, plate pieces, loosened and fallen small items from machines, etc). Therefore the magnetic separator as above removes major portion of metallic foreign materials. To take care of non-ferrous items, which could be like brass bushes, pins, etc., the metal detector system is installed after the magnetic separator. In the event of detection of such metal, system sprays / drops the marking on the material and simultaneously stops the conveyor, for manually picking away such foreign body.
Regards,
Ishwar G Mulani.
Author of Book : Engineering Science and Application Design for Belt Conveyors.
Author of Book : Belt Feeder Design and Hopper Bin Silo
Advisor / Consultant for Bulk Material Handling System & Issues.
Email : parimul@pn2.vsnl.net.in
Tel.: 0091 (0)20 25882916 ■
Metallic Debris on Belt Conveyors
Good Day Forum Members
Does anyone have experience or recommendations to share concerning the use of an electromagnetic field across the width of a moving belt conveyor to extract metallic debris.
I see larger electromagnets used to pick-up and move cars and scrap metal in a "junk yard", Would that approach work if the magnet hung over the belt and moved slow enough for the tramp metal to be extracted?
Thanks for any input ■