Electric pipe expander, chuck structure for electric pipe expander, and control circuit for electric pipe expander

An electric pipe expander, comprising a pipe expander body and a mandrel sliding cavity disposed on the pipe expander body, wherein a chuck body capable of clamping a pipe to be processed is disposed at an opening end of the mandrel sliding cavity, a mandrel is slidably connected in the mandrel sliding cavity, an outer side end of the mandrel is provided with an obliquely disposed pipe expanding cone, an inner side end of the mandrel is provided with an elastic body accommodating cavity, a guide screw rod provided with a transmission screw nut is disposed on the pipe expander body opposite to an opening of the elastic body accommodating cavity, the guide screw rod extends into the elastic body accommodating cavity, flat keys are disposed on the mandrel, outer side ends of the flat keys are slidably connected to a worm gear and worm mechanism in an axial direction, inner side ends of the flat keys are slidably connected into axial key slots of the transmission screw nut, and an elastic body is clamped and disposed between the flat keys and a bottom surface of the elastic body accommodating cavity.