here are also many types of ring -chain electric gourds. They can be distinguished according to the speed of lifting, slow, fast and fast electric gourd. The ring chain electric gourd can also be based on the hook -type electric gourd and the running electric gourd. Before use, check whether the chain chain ring is relaxing and free, and check whether there is a twist or entanglement. The chain can be used straight. Circle chain electric gourd is a lifting equipment widely used in factories, warehouses, buildings and other fields. Its shell is an important part of the equipment and is suffered from various loads and complex environments. In order to improve the strength, hardness, toughness and abrasion resistance of the case, thermal treatment process has become a key means. Through different thermal treatment methods, the performance of the shell material can be significantly improved, its service life is extended to ensure that the equipment runs stably in a rigorous working environment.