Paint spraying system for coating of outer surface of metal pipe

The invention relates to the technical field of metal tube surface spraying equipment, in particular to a paint spraying system for a coating of the outer surface of a metal pipe. The paint spraying system comprises a supporting plate, a paint spraying mechanism arranged on the inner side of the supporting plate, and a paint circulation conveying system. The paint spraying mechanism is composed ofa movable spraying assembly and a fixed spraying assembly. The movable spraying assembly and the fixed spraying assembly are arranged oppositely. The paint circulation conveying system is composed ofa paint tank, a pressure pump and a paint conveying pipeline of the paint circulation conveying system. When the outer surface of the metal pipe needs to be subjected to spraying operation, an external clamping device and a conveying device are used for enabling the metal pipe to pass through the region between the fixed spraying assembly and the movable spraying assembly, the pressure pump is started at the time to conve