Coal mill and air door assembly thereof

The air door assembly of the coal mill comprises a guide rail and an air door, the guide rail is provided with a guide groove with an upward opening, and the guide groove extends in the length direction of the guide rail; the air door comprises an air door body, a guide piece, a first roller and a second roller, wherein the guide piece, the first roller and the second roller are arranged on the lower portion of the air door body. The guide piece is slidably arranged in the guide groove in the length direction of the guide rail and matched with the guide groove. The first rolling wheel and the second rolling wheel are arranged on the two different sides of the guide piece in the width direction of the guide rail and are both arranged outside the guide groove. The coal mill has the advantages of being good in operation safety and the like. 本发明公开了一种磨煤机及其风门组件，所述磨煤机的风门组件包括导轨和风门，所述导轨具有开口朝上的导槽，所述导槽沿所述导轨的长度方向延伸；所述风门包括风门本体以及设于所述风门本体下部的导向件、第一滚轮和第二滚轮，所述导向件沿所述导轨的长度方向可滑动地设于所述导槽的内部且与所述导槽配合；所述第一滚轮和所述第二滚轮在所述导轨的宽度方向上设于所述导向件的两