Stirring apparatus of ingot casting furnace

A stirring apparatus of an ingot casting furnace, wherein the ingot casting furnace includes a crucible, a dome, and a transmission rod;

• the crucible is provided for housing liquid materials for casting the ingot;
• the dome is provided for housing dopants which can be vaporized;
• the transmission rod is connected to the dome with an end thereof for moving the dome;
• the stirring apparatus comprising:
• a support connected to an inner wall of the dome with two ends thereof;
• a rotating shaft having two ends, wherein one of the two ends is fixed to the support, the other one of the two ends is provided outside the dome and extends into the crucible;
• at least one fin provided on the other one of the two ends of the rotating shaft, wherein the at least one fin has a first edge and a second edge which correspond to each other, and have unequal lengths.