The front end of the speed reduction crankshaft (1) and the tail end of the main shaft (3) are made by adopting the polygon structure and are same as the inner structures of the grooves (5) and (6).
减速机轴(1)前端与主轴(3)的末端均采用多边形结构构成，并且与凹槽(5)及凹槽(6)的内部构造相同。
The improvement of the hook includes that the tail end of the hook is connected with a perforation ball body and the hook can rotate in 360 degrees taking the axis of the ball body as the shaft;
挂钩的改良为，在挂钩的尾端连接一个穿孔球体，挂钩可以以球体中轴线为轴360度 转动；
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