The invention discloses an antirust spraying device on an outer surface of a steel
pipe. The device comprises a lifting mechanism, two sets of
UV curing mechanisms with the same structure, a UV paint spraying mechanism, a pressing roller mechanism, a cooling mechanism and a
recovery mechanism. A lifting frame drives the spraying device to move up and down, and when the spraying device sprays steel pipes with different diameters, a centre line of the spraying device coincides with those of the steel pipes. The
UV curing mechanisms make the UV paint on the surface of the steel
pipe rapidly cured without a special
drying furnace device, and the space is saved. The UV paint spraying mechanism effectively controls the thickness of the UV paint film, and the pressing roller mechanism reduces the steel
pipe jump in the movement and reduces the influence of the steel pipe jump on the paint film uniformity. In the spraying process, coatings in a front spraying roller and a rear spraying roller are driven upwards by a fan, are filtered by a filter screen and are returned to a
coating barrel by a
recovery roller through a
recovery oil passage. Therefore, the recovery rate of the coatings is improved. The antirust spraying device can be used for spraying steel pipes, sections, rods, wheel hubs and other
metal materials.