Due to its excellent carrying capacity, in recent years, it has been widely used as an important part of electric gourds in recent years, which is our common ring chain electric gourd. Such a combination can also be described as each other. After the electric gourd replaces the wire rope with a chain, due to the small volume and good carrying capacity, it is favored by customers such as oil tanks and building climbing racks. It is a type of lifting equipment, which is mainly used to improve heavy objects. This has also greatly improved the application of the chain, and it has been more recognized in industrial buildings.