The invention relates to a
production line for
coating the inner wall and the outer wall of a
metal pipe. The
production line comprises a feeding device, an inner wall purging device, an outer wall purging device, a preheating furnace, an inner suction
coating device, a heat supplementing furnace, an outer spraying device, a curing furnace, a forced
cooling chamber, an inspection
station, a labeling mechanism, a code spraying mechanism and an automatic packaging
system which are sequentially arranged from front to back, the automatic packaging
system comprises an material collecting and steering conveying mechanism, bagging and film covering mechanisms, an electromagnetic carrying mechanism, a hexagonal forming device, a horizontal winding device, a semi-automatic
steel belt bundling mechanism, a bundling
machine conveying line, a steel
pipe conveying, transferring and storing mechanism, a steel
pipe weighing mechanism and an
electric control box, the bagging and film covering mechanisms and the code spraying mechanism are in
butt joint through the material collecting and steering conveying mechanism, the material collecting and steering conveying mechanism conveys at least two workpieces to the bagging and film covering mechanisms at a time, and correspondingly, the multiple bagging and film covering mechanisms are arranged and synchronously conduct bagging and shrinking. The
production line can guarantee the quality of the workpieces and improve the packaging efficiency.