Ventilation system of paint spraying hangar

The utility model discloses a paint spraying hangar ventilation system which comprises an air pipe assembly, the air pipe assembly supplies air through an air feeder, the air pipe assembly is hoisted on a hoisting device through a steel wire rope assembly, the hoisting device is of a hollow frame structure welded through a steel structure, and the hoisting device is welded to the top of a paint spraying hangar. An exhaust trench is arranged at the lower end of an airplane paint spraying part of the paint spraying hangar, the exhaust trench exhausts air through an exhaust fan, and a VOCs waste gas treatment chamber is arranged at the output end of the exhaust trench. The air pipe assembly is hoisted through the hollow frame type hoisting device and the steel wire rope, the whole hoisting device is small in material consumption, light in weight and small in occupied space, the steel wire rope has certain toughness, a metal air pipe is in a soft load hoisting mode, when the metal air pipe vibrates, certain soft