Sealed dust removal system refers to the use of fan, the dusty air in closed space by air filter to purify mine dustproof device. It is used for mine chute, and crusher, belt conveyor equipment such as the workplace, local dust, to eliminate dust pollution to the operation environment. Airtight dust system consists of airtight cover and dust exhausting duct, dust and fan etc.. The closed cover is a closed dust source. To prevent dust diffusion is an important part of the work area, usually made of thin iron plate, divided closed cover and a dust suction hood two types. The airtight cover dust source is completely closed, causing negative pressure inside the cover, to prevent the escape of dust.