Automatic mark spraying equipment for nodular cast iron pipes

The utility model relates to the field of cast iron pipe production equipment, in particular to automatic mark spraying equipment for nodular cast iron pipes. The robot walking frame is used for fixing the first six-axis robot and is provided with a sliding rail enabling the first six-axis robot to freely move in the X-axis direction; the ink circulating device is used for loading ink of various colors, is driven by compressed air, conveys the ink to the spray head and is automatically recycled; the first six-axis robot is used for automatically judging the model and the position of the cast tube and selecting a corresponding tube body line drawing motion trail; the spray head is mounted on a mechanical arm of the first six-axis robot, and the spray head is further connected with the ink circulating device through a pipeline; cast pipe conveying chain. Position spray printing is completed under the state that the nodular cast iron pipe is not rotated, a cast pipe paint film cannot be damaged, spare parts are