Swinging machine for preparing plastic-lined three-way elbow

The invention discloses a swinging machine for preparing a plastic-lined three-way elbow. The swinging machine comprises a driving motor, a gear shifting mechanism, a rotating shaft and a plastic-lined pipe which are connected in sequence, wherein the lining plastic pipe is fixedly connected to one end of the rotating shaft and synchronously rotates along with the rotating shaft, the rotating shaft can be in transmission connection with the driving motor through a gear shifting mechanism, the gear shifting mechanism comprises a driving gear and a discharging gear, when the gear shifting mechanism is in a driving gear, the driving motor drives the rotating shaft to rotate through the gear shifting mechanism, when the gear shifting mechanism is in the discharging gear, the driving motor is separated from the rotating shaft through the gear shifting mechanism. In conclusion, due to arrangement of the gear shifting mechanism, the driving motor does not need to be frequently started and stopped, a lining plastic p