Wheel nut seat taper hole opening size detection device and detection method

The invention particularly relates to a wheel nut seat taper hole opening size detection device and detection method. The detection device comprises a measuring rod, the measuring rod comprises a body, the longitudinal section of the bottom of the body is of an isosceles trapezoid structure, the included angle between the hypotenuse of the isosceles trapezoid structure and the symmetry axis of thehypotenuse is larger than the taper angle of a to-be-measured wheel nut seat taper hole, the bottom of the body can be clamped in the to-be-measured wheel nut seat taper hole, and the top end face ofthe measuring rod body is provided with a through end and a stop end which are different in height; the detection device further comprises a sleeve which sleeves the measuring rod and is in clearancefit with the body of the measuring rod, the lower plane of the sleeve is in contact with the plane of the taper hole opening of the to-be-detected nut seat, and the upper plane is a detection reference plane; when the aperture