The lifting chain is an important accessory of hoisting machinery. The rupture of lifting chain always happen during application . Let’s take a look at the reason for the fracture.
First, unqualified manufacturing and material make lifting chain itself has defects: for example, the material is embrittle, the welding is not strong enough, or the chain is wear, all of which will cause of rupture of the lifting chain. The rupture can be classified into brittle fracture or plastic deformation fracture. Brittle fracture occurs at the welded zone; plastic deformation occurs at the straight section of the chain link, where is subjected to large stress.
Second, the irregular operation of lifting chains: for example, the chain is too tight or too loose, overloaded lifting, chain be out of the slot, etc. All of which may cause the lifting chain to be break.
Third, The maintenance of the lifting chain is not insufficient. For example, the lifting chain is not placed in a dry and ventilated place which caused rust, the lubricating oil not injected in time, ignore the previous inspection before operation.
Knowing the cause of the break, we know how to avoid it:
First, we must select high-quality chain suppliers and purchase qualified chains.
Second, attach great importance to the chain operation rules, and personnel engaged in lifting operations must undergo professional training.
Third, pay attention to the daily maintenance, storage, regular inspection and pre-operation inspection of the chain.