Automatic spraying device for large steel structural member

The utility model discloses an automatic spraying device for a large steel structural member, which comprises a mounting cavity and a guide rail in sliding connection with the lower end of the mounting cavity, a storage cavity is fixedly connected onto the mounting cavity, and a swing part is mounted on the mounting cavity. The swinging part comprises fixing blocks, a rotating shaft, a transmission belt, a rotating rod, a cam, an L-shaped rod, a spraying cavity and a torsion spring, the two fixing blocks are fixedly connected to the mounting cavity, the rotating shaft is rotationally connected to the fixing block located on the right side, the rotating rod is rotationally connected to the fixing block located on the left side, and the rotating shaft is rotationally connected to the rotating shaft. According to the automatic moving spraying device, the servo motor is driven to drive the rotating shaft to rotate, when the rotating wheel rotates along with the rotating shaft, the mounting cavity can be driven to