| 摘要 |
A mandrel 50 for forming helically coiled heat exchange tubes, the mandrel comprising:a roller 16 to form the tube into a helical coil;a drive 52 for rotating the roller;a carriage 82 for indexing the tube with respect to the roller, wherein the roller comprises a plurality of winding beams 60, which beams are arranged to be radially movable by associated powered adjustable supports so as to permit rapid setting of the radius of a heat exchange coil formed on the roller. |
