On-line detector for round packaging object label and detecting system and detecting method thereof

An on-line detector for a round packaging object label comprises a label scanner, a rotating automatic clamping mechanism and a control system. The rotating automatic clamping mechanism comprises a first clamping part, a second clamping part and a pneumatic element. The first clamping part and the second clamping part are arranged opposite to each other, and the pneumatic element controls the first clamping part and the second clamping part to make opening and closing movement. The first clamping part and the second clamping part respectively comprise driving rollers, auxiliary rollers and driving roller motors. The driving rollers and the driving roller motors are in transmission connection. The control system of the pneumatic element, the driving roller motors and the label scanner are all electrically connected with the control system. The on-line detector for the round packaging object label is suitable for automatic production and detection in an automatic production line, manual intervention is needless