Mechanical sealing structure of coating kettle

The utility model provides a mechanical sealing structure of a coating kettle, and relates to the technical field of lithium battery cathode material equipment. The mechanical seal comprises a whole-circle graphite ring, a first graphite ring set, a second graphite ring set, a polytetrafluoroethylene ring set, a PTFE framework and a mechanical seal box body, the whole-circle graphite ring, the first graphite ring set and the second graphite ring set are sequentially arranged in the mechanical seal box body and jointly form a first seal, the polytetrafluoroethylene ring set forms a second seal, and the PTFE framework forms a third seal. The rotating shaft penetrates through the mechanical sealing structure of the coating kettle and is sequentially connected with all the structures in a close fit mode, three sealing protection measures are adopted, the sealing performance is excellent, air leakage and powder leakage are avoided, safety and reliability are achieved during use, the service life is long, meanwhile