Stretching device and method for optical fiber base metal

The invention discloses a stretching device and method for optical fiber base metal. The device comprises a vertical tower, a stretching heating furnace, a detector arranged below the heating furnaceand a data processing center, an upper lifting chuck and a lower lifting chuck are arranged at the upper end and the lower end of the vertical tower respectively. The upper lifting chuck and the lowerlifting chuck are connected with an upper rotating chuck and a lower rotating chuck respectively, the data processing center comprises a PID controller, the input end of the PID controller of the detector is connected with the detector, and the output end of the PID controller of the detector is connected with the upper lifting chuck and the lower lifting chuck. In the drawing process of the optical fiber base metal, a detector finds a detection point at the slope position of the base metal, and the detected outer diameter and the upper and lower lifting chucks are subjected to PID associatedcontrol at the same time.