1,The tong head is the open structure position, and the integral tong head has good hardness and rigidity; 2,The three-jaw-plate clamping device is adopted in the master tong and back tongs. The front two jaw plates of the master tong are in the swing structure and the back jaw plate is the roller-climbing structure. 3,Four-gear rotation is adopted for large speed regulation range. 4,It has the braking mode with braking staple. The braking torque is large. The operation is simple. And it is convenient for repair and replacement; 5,With the open large gear supporting structure, hardness and rigidity of open large gear is enhanced considerably; 6,The shell is made of steel plate with high hardness. 7,Hydraulic torque indicator is provided. And installation interface of turning torque instrument is provided for computerized management.