Nodular cast iron pipe preheating equipment

The invention provides nodular cast iron pipe preheating equipment, and belongs to the technical field of nodular cast iron pipes. The equipment comprises a transportation assembly, a sleeve and an induction coil. The transportation assembly is used for bearing the cast iron pipes and moving the cast iron pipes along with the axial direction of the cast iron pipes. The sleeve is used for forming achannel through which the cast iron pipes pass. The induction coil is fixedly arranged on the inner wall of the sleeve and is used for generating eddy currents in the cast iron pipes under the condition of electrification so as to heat the cast iron pipes. According to the nodular cast iron pipe preheating equipment, the cast iron pipes do not need to be heated by a large gas heating furnace, sothat the occupied space is saved; the heating efficiency of the cast iron pipes is improved, and uniform heating for the cast iron pipes can be ensured; an electromagnetic coil replaces gas to avoid hidden dangers of gas leaka