Online detection system for cylinder out-of-roundness

The invention discloses a cylinder out-of-roundness on-line detection system, the on-line detection system comprises a translation rotation device and an optical imaging device, the translation rotation device comprises at least two chain plates, a baffle plate, a rotation belt and a detected cylinder, the chain plates are parallel to the ground to form a plane, the optical imaging device comprises the detected cylinder, and the baffle plate is arranged on the detected cylinder. The parallel light source is arranged in the baffle and emits light in the rotation direction of the rotation belt, the first reflector is fixed to the baffle and located on the reverse side of the light source, the included angle between the first reflector and the rotation belt is beta, and the second reflector is arranged on the parallel left side and translates in the rotation direction of the rotation belt to be provided with the camera. The device has the beneficial effects that the translation rotating device and the optical im