Online filter disc replacing device for carbon black main supply fan

The utility model relates to the technical field of main carbon black supply fans, in particular to the technical field of filter disc replacement of the main carbon black supply fans, and particularly relates to an online filter disc replacement device for the main carbon black supply fans. In order to solve the problem that the whole carbon black production system and equipment are greatly harmed and have economic loss due to the fact that the machine needs to be stopped when the filter disc is replaced and cleaned every time, the utility model provides the on-line filter disc replacing device for the carbon black main supply fan, which comprises a cubic outer cylinder and a cubic inner cylinder with a filter disc fixed on an opening surface at one end, a drawing handle is fixed on the outer side face of the inner barrel, a drawing hole matched with the inner barrel is formed in one side face of the outer barrel, the inner barrel penetrates through the drawing hole to be arranged in the outer barrel in a sl