Raymond mill with adjustable grinding granularity

An air outlet of a high-pressure fan is connected with a grinding chamber in a sealed mode through an air inlet reducing pipeline, a classifier is installed above the grinding chamber in a sealed mode through a sealing device, and the upper end of the classifier is connected with a receiving bin in a sealed mode through an air outlet reducing pipeline. An opening is formed in the upper end of the receiving bin and is hermetically connected with an air inlet of a high-pressure fan through a circulating air pipeline; and the three grinding rollers and the three scraper knives are mounted in the grinding chamber. The utility model solves the problems that the production blank exists in the barite mineral powder ultrafine series in China at present, the Raymond mill cannot be used for meeting the requirements of some customers with high requirements on the barite mineral powder fineness, the production cost is high, and the like, and has the advantages of high crushing granularity, low production cost, stable mec