Centrifuge

A centrifuge comprising:

• a bowl which rotates about a vertical axis, has an opening functioning as a supply port of a liquid to be treated and also functioning as a discharge port of a separated solids cake centrifugally separated from the liquid to be treated, the opening being provided in a center of a lower part of the bowl, and has a tapered section of which an inner peripheral surface decreases in radius downward toward the opening;
• protrusions which are provided in a plurality of circumferential locations on the inner peripheral surface of the tapered section of the bowl and protrude from the inner peripheral surface;
• a wing which rotates within the bowl about the vertical axis and conveys the separated solids cake in the bowl toward the opening when rotating relative to the bowl in a predetermined direction of rotation;
• and
• a drive mechanism which moves the wing to a first height position to integrally rotate the bowl and the wing, and moves the wing to a second height position lower than the first height position to rotate at least either one of the wing and the bowl so that the wing rotates relative to the bowl in the predetermined direction of rotation, wherein
• a portion of the wing corresponding to the protrusion is notched into a shape not to collide with the protrusions when the wing and the bowl rotate relative to each other.