Plasticizing device, injection molding device, and three-dimensional shaping device

A plasticizing device comprising:

• a drive motor;
• a flat screw having a groove forming surface in which a groove is formed and configured to rotate around a center axis;
• a barrel having a facing surface facing the groove forming surface in a direction along the center axis and having a communication hole formed in the facing surface, the communication hole allowing a plasticized material as a plasticized material to flow out;
• a heating unit configured to heat the material supplied to the groove;
• a flow path through which the material or the plasticized material flows;
• a nozzle communicating with the flow path and allowing the plasticized material to flow to an outside;
• a plurality of measurement units configured to measure pressures or temperatures at a plurality of locations in the flow path;
• an aspiration delivery unit including a cylinder having a branch flow path as a part of the flow path and a plunger configured to move in the cylinder so as to aspirate the plasticized material into the branch flow path or deliver the aspirated plasticized material to the nozzle;
• and
• a control unit configured to identify a state of the material or the plasticized material in the flow path based on a plurality of measurement values measured by the plurality of measurement units, wherein
• the plurality of measurement units measure temperatures or pressures at least at a plurality of locations in the branch flow path.