Chain conveyors use chains as traction and carriers to transport materials. The chains can use ordinary sleeve roller conveyor chains, or various other special chains (such as accumulation and release chains, double-speed chains). The chain conveyor has a large conveying capacity and is mainly used to convey pallets, large turnover boxes, etc. Conveyor chains have various structures and accessories, which are easy to realize accumulation and transportation. They can be used in assembly production lines or as storage and transportation of materials.