The link should be formed steel plate, plate edge, no burr hole; A joint warping, used to be calibrated to prevent injury and friction, the friction surface to ensure close.

• 连接处的钢板或型钢应平整,板边、孔边无毛刺；接头处有翘曲、变形必须进行校正，并防止损伤摩擦面，保证摩擦面紧贴。