Welding equipment for air duct of fan

The air duct welding equipment comprises a bottom plate, a first double-rotor linear motor is fixedly installed at the position, close to the front surface, of the upper surface of the bottom plate, a second double-rotor linear motor is fixedly installed at the position, close to the rear surface, of the upper surface of the bottom plate, and a third double-rotor linear motor is fixedly installed above the bottom plate. A roller is movably installed above the bottom plate, a clamping plate is movably installed above the third double-rotor linear motor, and clamping blocks are movably installed on the surfaces of the two ends of the roller in an embedded mode. According to the air duct welding equipment of the draught fan, welding can be conducted by adjusting the angle of the air duct after the welding gun is fixed when the annular plate and the air duct are welded, welding defects are reduced, meanwhile, the welding device can freely adjust the distance between the clamping plate and the rotary drum accordin