Weld seam cover on the inside of sheet metal tubes
OwnerErnst M. Freyinventor
Life of this patent
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Abstract
On the welding arm of a welding machine is mounted a coaxial application pipe with removable transport means and an application nozzle. Into this application pipe is fed a block-shaped hot-melt mass, in the direction opposite the advance direction of the sheet metal tube, guided in direction (V) of the application tube, melted in the area of a narrowing heater, passed through a supply tube to the application nozzle and applied or sprayed as a hot-melt strip to the inside of the longitudinal weld seam of sheet metal tubes. The application of a hot-melt strip is suitable in particular for the protection of the longitudinal seam of a tin-plated can shell.
Claims10
A welding machine device for the continuous application of a protective layer to cover the inside of a longitudinal weld seam of sheet metal tubes lying end to end comprising an inner welding roller arranged on a welding arm, an application arm running coaxially to the welding arm, removable means for transporting in an axial direction the sheet metal tubes lying end to end and an application device comprising a nozzle for the protective layer, characterized in that:
- the application arm providing for the introduction of a block-shaped block of hot-melt mass is tubular,
- means for advancing and pressing the hot-melt mass in an advance direction (V) towards the welding arm with a forward and backward moving insert,
- a heater which narrows in the advance direction (V),
- a supply tube is provided for supplying an interchangeable application nozzle arranged next to the welding arm.
Dependencies are inferred from the claim text.