... , definite stress, stable operation, simple operation,steel coil lifting protection Work principle: The coil lifter is driven by a motor ... by the gearwheel. Point: 1, There is Electro-optical Sensor Protection System (patent number: ZL 2010 2 0128833.3) to protect the ... . It is moderate price, easy to operate, provide good protection for coil. Steel coil Lifting tongs with Protection System/crane grab