Automatic mark spraying device for nodular cast iron pipe

The invention relates to the cast iron pipe production equipment field, in particular to an automatic mark spraying device for a nodular cast iron pipe. The automatic mark spraying device for the nodular cast iron pipe comprises a lifting device, a robot walking frame, an ink circulation device, a first six axis robot, a spray head and a cast pipe conveying chain, wherein the robot walking frame is used for fixing the first six axis robot, and equipped with a sliding rail which can enable the first six axis robot to move at random in the X axis direction, the ink circulation device is used forloading inks of all colors, and driven by compressed air, and conveys the inks to the spray head for automatic circulating usage, the first six axis robot is used for automatically judging the type and position of the cast pipe and selecting a corresponding drawing pipe body line motion trail, the spray head is installed on a mechanical arm of the first six axis robot, and the spray head is further connected with the ink