Hebei Fanggong HS type chain hoist lifting principle: The chain hoist is driven by pulling the chain rod to rotate the chain wheel, pressing the friction plate, ratchet, and brake seat into one, driving the 5-tooth long shaft to rotate. The 5-tooth long shaft meshes with the plate gear, the plate gear and the 4-tooth short shaft are pressed into one, the 4-tooth short shaft meshes with the spline hole gear, and the spline hole gear is connected to the lifting sprocket with splines to drive the lifting chain. The chain hoist can only lift heavy objects.

　　Gear transmission principle of Hebei Fanggong HS type chain hoist: the transmission gear of HS type chain hoist adopts two sets of two-stage straight cylindrical gears arranged symmetrically, and two parallel transmission chains are composed of parallel intermediate gears between the hand sprocket shaft and the lifting sprocket shaft. At the same time, the hand sprocket is installed at the center of the lifting sprocket shaft for the sake of compact structure and beautiful appearance, so the center distance between the work and the work gear is the same. Due to the structural characteristics of the chain hoist, the manufacturing process should ensure the correctness of the relative position of the gear combination assembly, so that the gear and gear are tightly engaged at any time during operation.