| 摘要 |
<p>Apparatus for internally coating a pipe (42), comprising electric heating means (21) heating a pipe as it is internally spray coated, includes a plurality of rotatable inlet (28 and 30) and outlet rollers (32 and 34) which are paired to define a nesting (41) groove located above the gap between each set of paired rollers. Motive means (48) rotates the shafts and the mounted rollers to rotate the pipe within the nesting grooves (41) of adjacent pairs of rollers. Axial advancing means longitudinally advances the pipe through the heating means (21) and sequentially along the nesting grooves (41) of adjacent pairs of rollers. A movable holdback means (53) is located on the outlet side of the heating means (21) for restraining the advancement of the pipe (42) to a predetermined rate of speed sufficient to insure application of uniform thin coating of coating material on the pipe internal surface, thereby overcoming thermal and magnetic effects of the heating means (21) which would otherwise advance the pipe (42) faster than the speed of the axial advancing means.</p> |
