Elbow-shaped duct manufacturing apparatus

An elbow-shaped duct manufacturing apparatus (1), comprising:

• a main body (100);
• a duct movement guiding part (200) rotating a duct (10) and moving the duct (10) upward;
• a duct vane forming part (300) including forming sections (313, 314) for forming upper and lower vanes (11, 12) of the duct (10);
• a rotary driving part (500) including a cutting roller (510) for cutting the duct (10) and a forming roller (520) for pushing the upper and lower vanes (11, 12) of the duct (10) formed through cutting to the forming sections (313,314) and pressing the pushed upper and lower vanes;
• and
• a duct vane coupling part (400) coupling the upper and lower vanes (11, 12) of the duct (10), wherein
• the duct vane forming part (300) includes:
• first forming jigs (310, 310′) symmetrically disposed to slide in opposite directions and having first semicircular parts (311, 312) of a semicircular shape formed on inner sides, respectively, the forming sections (313, 314) being formed on inner surfaces of the first semicircular parts (311, 312), respectively;
• and
• second forming jigs (320, 320′) detachably disposed on the first forming jigs (310, 310′) and having second semicircular parts (321, 322) of a semicircular shape formed on inner sides, respectively, a diameter of the second semicircular parts being smaller than that of the first semicircular parts (311, 312), respectively.