Semitrailer hub center hole detection device

The invention relates to the technical field of semitrailer hub detection, in particular to a semitrailer hub center hole detection device which comprises a detection table, a placing disc, a center hole pin shaft, a supporting disc, a first alarm switch and a lifting assembly and is provided with a driving part and a clamping plate. The driving piece drives the clamping plate to move and guide the semitrailer hub, the lifting assembly drives the supporting disc to move upwards, the supporting disc drives the center hole pin shaft to move upwards, and the center hole pin shaft is inserted into a center hole of the semitrailer hub. The qualified rate of the semi-trailer hub center hole is judged according to whether the semi-trailer hub mounting surface extrudes the first alarm switch or not, and when the first alarm switch is started and gives out an alarm sound, it is indicated that the semi-trailer hub center hole is too large and unqualified, so that workers adjust a production line, and the problems that