Nozzle deflection measuring device and method thereof

A nozzle deflection measuring device, comprising:

• a nozzle configured to rotate about a rotation axis, the nozzle including
• a cylindrical shaft body extending along the rotation axis, and
• a spout located at a distal end portion of the shaft body;
• a tank-shaped container having
• an insertion opening for the spout to be inserted, the insertion opening having a radius larger than a sum of a radius of the shaft body and a maximum allowable deflection amount of the nozzle,
• a folded back portion arranged entire circumference of the insertion opening, the folded back portion extending inward of the container, and
• a discharge port;
• a moving mechanism configured to move the nozzle relative to the container, and
• a non-contact deflection measuring meter arranged outside of the container and in the vicinity of the insertion opening, the deflection measuring meter configured to measure a deflection of the nozzle inserted through the insertion opening in a state where the spout is disposed inside the container.