The permanent lifting mainly in the lifting process retention plate-shaped or cylindrical workpiece ferromagnetic material, with a compact structure, convenient operation, strong retention, no power, and security and reliability features that will help improve handling Handling job working conditions, increase their labor productivity, so as an efficient, safe, energy-efficient new hoisting tool has been widely used in shipbuilding, engineering machinery, mold manufacturing and other industries. PM sucker in the market where are sold, the price is different, of course, the price level will directly affect the product quality problems. So most of the customers do not know what kind of good, what is bad, and sometimes when buying products just tell me to get better, maybe someone so that the most expensive is the best, this idea is completely wrong, for the majority of customers will not be deceived, or less summed up the points we can for everyone to consider: First, the spindle hole of protective measures, Ruoguo protection measures do not inhale it because a lot of iron, dust, This will give the spindle stuck. Second, the safety locking device, if poorly designed safety locking device, that in case of lost in the process of being sucked lifting objects will fall, resulting in accidents. Third, the internal magnetic structure, magnetic circuit structure is irrational if it directly affects the pull-off force and not to play the role of the permanent magnet. Fourth, the flexibility of the spindle rotation, flexibility spindle rotation is directly related to the comfort of the operating process, but not flexible will be very difficult. Five is the safety factor, which is the issue of permanent magnet sucker to buy most concerned about, the most important issue. It's the safety factor generally: 2.5,3.0,3.5 several, the greater the safety factor, of course, will be very safe to use. Sixth, the occlusal surface of the suction process, it must pull side grinding, so that when lifting the object being sucked to the greatest degree of pull. Seventh, rings, rings are generally welded, and after using a long time will encounter some problems, one should always pay attention. 

keywords: Magnetic crane, electromagnets, magnetic chuck,