Rim flatness detection method

The invention discloses a rim flatness detection method. The method comprises the following steps: a rim clamping turntable drives a rim to be detected to rotate from any rotation position, at the same time, a line laser sensor is triggered to detect the rim, and after the rim clamping turntable drives the rim to rotate for a circle along a first direction, the line laser sensor detects the flatness of the rim; when the rim clamping turntable drives the rim to rotate, the coordinate system of the rim clamping turntable serves as a reference coordinate system, the measuring coordinate system of the linear laser sensor rotates around the rim in the second direction and scans the rim, the rotating position of the rim clamping turntable measured by the linear laser for the first time serves as a reference, the data measured by the line laser at each time are converted into the rim coordinate system, the complete contour surface of the rim is finally obtained, and rim flatness detection is achieved. The detection