Patent ID: 9661691
Date: 2017-05-23
CPC Classifications: C21D,F04B,F04C,H05B,Y02P

Claim:
1. A system for induction heating a helical rotor having an axis of rotation, a minor diameter, a major diameter and a pitch length, the system comprising: a frame including a rotor guide mount and rotor guide rollers for holding the helical rotor and advancing the helical rotor along the axis of rotation; a helical induction coil for radiating a magnetic field onto the helical rotor for induction heating the helical rotor, the helical induction coil having at least one loop with overlapping, adjacent ends, the loop having an inner diameter greater than the minor diameter of the helical rotor and smaller than the major diameter of the helical rotor; a support for holding the helical induction coil around the helical rotor, the support including adjustment means configured to maintain a gap between the helical rotor and the helical induction coil; a first motor mounted to the frame and connected to the helical rotor to rotate the helical rotor at a rotational speed about the axis of rotation within an inner circumference of the helical induction coil; a second motor mounted to the frame and connected to the helical rotor to advance the helical rotor at an advancement speed through the helical induction coil along the axis of rotation; synchronization means to synchronize the advancement speed of the helical rotor with the rotational speed to advance the helical rotor one pitch length through the helical induction coil for each complete rotation of the helical rotor.