Maintenance kettle structure

The utility model relates to the technical field of maintenance reaction kettles, in particular to a maintenance kettle structure, which comprises a maintenance kettle, a cap and a plug, a pressing cap flange plate is fixedly mounted at the top of the maintenance kettle, the cap is arranged at the top of the pressing cap flange plate, the plug is in threaded connection with the inner wall of the cap, and the cap is fixedly mounted on the cap flange plate. A flexible graphite sealing ring is fixedly installed on the outer surface of the plug, and a heating rigid sleeve is fixedly installed on the outer surface of the curing kettle. The sealing device has the advantages that the radial sealing structure is adopted, the sealing position is located in the inner cavity of the curing kettle, sealing is conducted through friction force generated by the flexible graphite sealing ring and the inner cavity, and the sealing device is more reliable than an end face sealing mode that the flexible graphite sealing ring is