Position changing machine for welding gas turbine jet nozzle

The utility model relates to a positioner for welding steam turbine nozzles, in particular to a positioner used for welding. In order to meet requirements of welding quality for steam turbine nozzles, the turnover half-gear (11) of the utility model is fixed to the beam (4); the turnover motor (12) is fixed to the right supporting arm (3) under the turnover half-gear (11); the output gear (12-1) of the turnover motor (12) is meshed with the turnover half-gear (11); the two ends of the beam (4) are connected respectively to the left supporting arm (2) and the right supporting arm (3) via the left supporting axis (5) and the right supporting axis (6); the top end surface of the weighted gear (8) is connected to the bottom end surface of the working platform (7) while the middle of the weighted gear (8) is in rotary connection with the beam (4); the drive output terminal of the revolving motor (10 ) is connected to the drive input terminal of the reduction gearbox (9), while the output gear (9-1) of the reduction gearbox (9) is meshed with the weighted gear (8) through the beam (4). The utility model is applicable to weld nozzles of subcritical, direct air-cooled, and supercritical machines; the utility model can weld two welding cracks simultaneously vacuumized once.