| 摘要 |
DRUM WELDING APPARATUS An apparatus is disclosed for automatically welding sheet metal panels to form part of a revolving drum for concrete transit mixers. The apparatus includes a fixture having an annular central core, linear and generally longitudinal ribs extended away from the core, and circumferential ribs extended radially outwardly of the core. The ribs intersect to define compartments in the fixture which are closed when the sheet metal panels are placed on the fixture. The compartments are then evacuated, creating a pressure differential to fix the panels on the fixture. A welding carriage is slidably supported on a rail above the fixture. The fixture can be tilted to selectively align panels along the rail for welding linear seams. Circumferential seams are welded by rotation of the fixture while the carriage is held stationary. To more positively maintain the panels in place during welding, compartments along the interfacing edges of adjacent panels are subjected to a higher vacuum. |
