Automatic spraying system for pipe fitting bell and spigot

The invention relates to an automatic spraying system for a pipe fitting bell and spigot, which comprises a first robot used for spraying the inner wall and the end face of a pipe fitting bell mouth,a rotary supporting device used for driving the pipe fitting to rotate, a lifting device used for lifting the pipe fitting, a second robot used for spraying the outer wall of a pipe fitting spigot anda pipe diameter detection device used for detecting pipe diameter information of the pipe fitting. The first robot sprays the inner wall and the end face of the pipe fitting bell mouth according to bell mouth spraying track parameters corresponding to the pipe diameter information; and the second robot sprays the outer wall of the pipe fitting socket according to the socket spraying track parameter corresponding to the pipe diameter information. Automatic spraying operation can be conducted on the inner walls of bell mouths and the outer walls of spigots of pipe fittings with different pipe diameters, automatic mixed