The performance and reliability of a hand chain hoist depend on the design and manufacture of its core components. These include the hand chain wheel, brake assembly, lifting sprocket, long-shaft gear, splined gear and sprocket assemblies, wallplate assembly, hook assembly, tail ring frame assembly, and lifting chain.
The hand chain wheel, as the core component of the chain drive, can be customized with or without a limit device. A sprocket design with a limit device ensures that the chain will not jam with the nut when descending to the bottom. The brake assembly includes a brake seat, friction plates, and a ratchet, which together control the braking performance of the chain hoist. The lifting sprocket is typically made of high-strength ductile iron, internally fitted with needle roller bearings and a long-shaft gear. The long-shaft gear is made of high-strength alloy steel and undergoes a rigorous heat treatment process; some high-end models use a simply supported beam structure to improve strength and operational smoothness. The splined gear and sprocket assemblies include sprockets and short-shaft gears, using high-quality materials and processes.
The wall panel assembly includes a left wall panel and an outer wall panel. The left wall panel contains a bearing outer ring, guide wheel, and chain retainer plate. High-end models of the outer wall panel feature a deep groove ball bearing in the center that engages with a long shaft gear, forming a simply supported beam structure. The hook assembly is made of 20Cr alloy steel and is shaped like a fishing hook. The tail ring frame assembly includes a tail ring frame and a tail ring pin; the tail ring frame is made of cast steel. The lifting chain is a G80 grade galvanized chain with adhesive coating for rust prevention. Single or double chains can be selected depending on the hoist's load-bearing requirements.