| 摘要 |
<p>INTERNAL GIRTH COATING APPARATUS An internal pipe coating apparatus for coating the interior surfaces of uncoated weld joints in an otherwise internally coated pipeline comprising a frame movable longitudinally along the interior of the pipeline, the frame having a shaft at its forward end and disposed generally along the longitudinal center line of the pipeline, a coating assembly comprising a pair of horizontally spaced arms mounted for rotation on the shaft and extending radially outward on opposite sides thereof, a pair of spaced parallel links having their inner ends pivotally connected to the outer ends of the arms and having their outer ends pivotally connected to a pair of triangularly shaped mounting plates, each mounting plate being in the shape of an obtuse isosceles triangle having a single obtuse angle and a pair of smaller acute angles, each mounting plate being pivotally connected to its associated link at the apex of the obtuse angle, a wheel mounted on each mounting plate at the location of each acute angle thereof, a hollow powder applicator head mounted on each mounting plate and having a dispensing opening oriented in a direction away from the shaft and parallel to the longitudinal axis of the pipeline, a hose for supplying an airpowder mixture to each powder applicator head, a piston-cylinder unit operatively connected to each pair of links intermediate the ends thereof and operatively connected to the pair of arms adjacent the shaft, a conduit for introducing fluid under pressure into each piston-cylinder unit to extend the same so as to pivot said links outwardly away from said shaft until said wheels contact the inner surface of the pipeline and the dispensing opening of each applicator head is positioned adjacent the weld joint.</p> |
