Lift charts created by scrap handler manufacturers are a good place to start when researching what size of magnet to use, Volansky says. He is director of sales at Alliance, Ohio-based Winkle Industries. Selecting the magnet matched to maximize a hydraulic scrap handler’s lifting capacity is critical to the safety, efficiency and productivity of an operation, Mark Volansky says. Consistent and systematic inspection programs for magnets are keys in identifying a magnet that is in the early stages of failure. Operators are the front line defense in preventing premature magnet failures, and if they truly understand the potential consequences of mishandling a magnet, as a scrap processor, they can be your best asset in extending service life. Two key components are operator training programs to help crane operators understand the consequences of mishandling or abusing a magnet, as well as developing and maintaining a consistent magnet inspection program. MV: There are things that can be done to help extend magnet life. RT: What are some tips for extending a lifting magnet’s life? These two field tests will give you a pretty good indication of what is happening inside the magnet. Also, take a Megger (insulation resistance) reading to test for grounding between the coil and case. You can test the resistance with an ohmmeter and compare with the nameplate data to determine the integrity and condition of the conductor. Any mechanical abuse may also contribute. These two items can have a domino effect and cause a magnet to fail prematurely.Īny time a magnet is not allowed to cool and dissipate the heat generated by the coil, it can cause premature magnet failure. MV: The main causes of magnet failures are heat and abuse.
RT: What are the main causes of magnet failures? are there tests to help determine a magnet’s electrical condition?
MV: Here are some key things to look for: RT: What are some operations-related signs that a lifting magnet may be ready for its turn in the remanufacturer’s shop? And if the duty cycle is exceeded frequently (as is often the case), the magnet life cycle can be decreased significantly and fail prematurely. However, when a magnet exceeds its duty cycle, the integrity of the insulation is compromised. If a magnet is operated according to its rated duty cycle and is not abused or damaged mechanically, it may go several years before requiring an overhaul or rebuild. MV: The time frame for remanufacturing a lifting magnet is dependent more on duty cycle rather than number of operating hours. RT: How do operating hours or number of duty cycles tie into when a lifting magnet will need an overhaul or rebuild? For a 75 percent duty cycle magnet, the magnet can be operated approximately seven minutes out of every 10.Įxceeding the duty cycle will have a negative impact on the productivity and life of the magnet. Duty cycle is generally measured in 10-minute intervals, so for a 50 percent duty cycle magnet, every five minutes the magnet is operating, it should be off for five minutes. Mark Volansky (MV): Duty cycle is simply time on versus time off. Recycling Today (RT): What is Duty cycle and how does it affect performance? In the following interview, Brian Taylor of Recycling Today asks Mark Volansky, the director of sales of Alliance, Ohio-based Winkle Industries, what operations personnel should keep in mind as they assess the performance of their lifting magnets and determine a path forward when it’s time to rebuild or replace them. Lifting magnets can be one of the more durable pieces of equipment used by scrap metal recyclers, but these ferrous scrap yard workhorses do not last forever.Īmong the many operations aspects yard managers and material handler equipment operators must monitor is how well their lifting magnets continue to lift.
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