Maximum pull-out force of permanent magnet crane.

Steel wire ropes, lifting belts, and lifting chains must undergo strict ultimate stress testing before leaving the factory, which means that under the action of mechanical equipment, they are constantly subjected to tensile force until the lifting slings are completely broken. The tensile force at the moment of being pulled off is the ultimate stress, and whether the lifting sling is qualified requires observation that the ultimate stress reaches the standard value, otherwise it will be directly scrapped. In addition to rigging, permanent magnet hoists will also undergo similar tests.

As is well known, permanent magnet lifting equipment is a relatively advanced lifting equipment that utilizes the principle of electromagnetic induction to carry out operations. It uses strong magnetic force to adsorb the lifting target, thereby completing the lifting under the action of the crane. Permanent magnet hoists are mostly used for lifting steel plates in steel mills, and their magnetic force and ultimate stress also require a standard load value. So what is this value? How should we measure it?

Permanent magnet hoists are usually tested for maximum pull-out force before leaving the factory, so what is the maximum pull-out force? That is to say, the magnetic force of the permanent magnet crane cannot reach the weight of the lifting target, thus unable to complete the lifting, and this threshold is the maximum pull-off force. During the testing process, advanced equipment will also be used to continuously apply tension to the permanent magnet lifting device that is being adsorbed, until the permanent magnet lifting device completely disengages. At this point, the force is the maximum pulling force of the permanent magnet lifting device.

Generally, the maximum pull-out force of the permanent magnet crane needs to reach 3.5 times of its rated load, that is, if the rated load of the permanent magnet crane is 2 tons, then it must have the ability to lift a weight of less than 7 tons. Of course, this is an ideal value, and it is also the standard for the safety of the permanent magnet crane. However, in the actual use process, it cannot exceed the rated load of 2 tons, which is the maximum pull-out force of the permanent magnet crane.