Uniform induction heating device for surface of tubular or columnar object

The present invention provides a tubular or cylindrical object surface uniformity induction heating apparatus, comprising a tubular or cylindrical object, a hollow insulating sleeve and an electromagnetic induction heating unit; this electromagnetic induction heating unit further includes a heating coil and a plurality of guide magnet (magnetic flux concentrator); after enabling the tubular or cylindrical object is fixed on a hollow heat-insulating sleeve, the electromagnetic induction heating unit next coated on the outer heat insulating sleeve, whereupon, due to the electromagnetic induction heating unit EME while the surface eddy currents are generated on the tubular or cylindrical object, and by virtue of the permeable mass to limit the magnetic field lines, improve heating efficiency, so that the tubular or cylindrical object, fast and uniform heating, with the other insulating jacket thermal energy dissipation is not easy, accordingly, to enhance heating efficiency and to reduce heat dissipation advantages and effects.