Forced expansion device for machine head expansion sheet of glass fiber drawing machine

The utility model relates to a forced expansion device for machine head expansion pieces of a glass fiber drawing machine, which belongs to the technical field of glass fiber drawing machine equipment and comprises a machine head spindle, a plurality of annularly distributed expansion pieces are arranged on the machine head spindle, and a rotary drum connected with the machine head spindle in a nested manner is arranged between the expansion pieces and the machine head spindle. The front end of the rotary drum is provided with an upper screw ring which is fixedly nested with the rotary drum, the expansion pieces are movably clamped and embedded with the rotary drum 6 in a stepped mode, the rear end of the rotary drum is provided with a machine head rear end cover which is fixedly nested with the rotary drum and the machine head main shaft, and disc type taper sleeves which are movably inserted and embedded with the expansion pieces are arranged between the rotary drum and the upper screw ring and between the