Exhaust fan the dust from the air inlet gas is introduced into the casing, which has the clean gas through the filter bag is made up of venturi tube into the shell, and the net gas outlet, and the dust be trapped to the outside of the filter bag, along with filtration time, adsorption on the filter bag dust is more and more thick, filter bag resistance is more and more big, at this point, the pulse signal controller,The switch of each pulse valve is programmed to make the high pressure air source spray into the filter bag through the injection hole and venturi tube. Due to the action of the high pressure air, the filter bag expands rapidly and causes impact vibration, so that the dust adsorbed on the surface of the filter bag is shook off in the ash hopper and discharged from the transport aircraft.