Thrust load measuring device for sealed mixing device and calibration method for same

A thrust load measuring device of a hermetically sealed kneader, the hermetically sealed kneader including a pair of rotors that are disposed to be adjacent to each other with a predetermined space therebetween in such a manner that axes are parallel to each other and rotate in directions different from each other, in which a bearing that supports a load applied to each rotor in a radial direction is provided at both end sides of the pair of rotors, and a load applied to each rotor in a thrust direction is supported by the bearing on one end side among from the bearings at both the end sides, the thrust load measuring device comprising:

• a displacement sensor that determines a relative displacement along an axial direction between an outer race fixing component that fixes an outer race of the bearing on the one end side and an inner race fixing component that fixes an inner race of the bearing on the one end side in order to calculate a thrust load applied to the rotor by multiplying the determined relative displacement by a conversion factor;
• axial force measuring bolts that can measure a load applied in the axial direction as fastening bolts for fixing the bearing on the one end side when a thrust load is applied to the rotor;
• and
• a load calculating section that calibrates the conversion factor using axial forces measured by the axial force measuring bolts and the relative displacement when the axial forces are measured such that the calibrated conversion factor is obtained by dividing the measured axial force by the relative displacement.