Rust removal of steel pipe/piece, the hydraulic lifting mechanism is used to transport the steel pipe/piece to the transmission pipe conveying line of the steel pipe shot blasting cleaning line, and the steel pipe/piece is turned and entered the shot blasting room. When the signal of the steel pipe/piece is collected by the internal sensor, the control system commands the shot gate to open, and the pellets are thrown against the outer wall of the steel pipe to remove the rust and impurities attached to the outer wall of the steel pipe. The steel pipe workpiece enters the output roller table, and after shot blasting, the outer surface of the steel pipe workpiece meets the requirements of sa2.5.

Polyurethane spraying, the steel pipe in a certain Angle of the rotating tugboat uniform speed, spraying robot will be the polyurethane raw materials in the shape of umbrella, fog and mixed evenly spray on the spiral forward steel pipe, polyurethane raw materials launched within a certain period of time, to meet the technical requirements of the compressive strength and design thickness, to complete the production of spraying insulation layer. Multiple spraying can be performed when the required thickness is large.