The utility model relates to the field of environmental protection dust, especially for open-air yard of dust collecting systems, including the following parts: belt haul sealed cover set nose discharge dust cover, under the under the barrel feed opening set at a cylinder dust cover, dust cover set auto loading loading position at the top of the car, nose discharge dust cover, a cylinder dust cover dust cover and car loading respectively by pumping duct communicates with the dust removal equipment, yard work area edge to the ground under the feed end of the barrel set yurt. Dust the utility model can effectively capture the nose discharge generated when the powder falling due to high drop generated dust, powder accumulation of dust to dust around the elegant, generated when loading the car to meet the requirements of environmental protection and industrial hygiene and low investment, low operating costs, does not affect the yard operation, reliable operation, high collection efficiency.