Dynamic sealing structure and rotary kiln apparatus

A dynamic sealing structure, comprising a kiln tail, a laying-off cover, a sealing mechanism, a guiding mechanism and a balancing device, wherein

• the laying-off cover comprises a laying-off cover cylinder and a laying-off cover end face connected with the laying-off cover cylinder, and the laying-off cover cylinder is sleeved on outside of a circumferential wall of the kiln tail, and the laying-off cover end face and an end face of the kiln tail are arranged at an interval;
• the sealing mechanism is arranged between the laying-off cover cylinder and the kiln tail and is connected with an inner wall of the laying-off cover cylinder;
• the guiding mechanism is arranged between the inner wall of the laying-off cover cylinder and an outer side of the kiln tail and is located on one side or two sides of the sealing mechanism along an axial direction of a rotary kiln, and a rotating gap is provided between the guiding mechanism and the kiln tail, so that the sealing mechanism is coaxial with the kiln tail;
• and
• the balancing device is connected to an outer side of the laying-off cover cylinder and is configured to control the laying-off cover to exert on the kiln tail a force not greater than 10% of gravity of the laying-off cover in any direction, wherein
• preferably, an interval between the laying-off cover end face and the end face of the kiln tail in an axial direction of the kiln tail is 0.3-2.0 m;
• preferably, the guiding mechanism is located on both sides of the sealing mechanism along the axial direction of the rotary kiln;
• and
• preferably, the rotating gap is greater than a sum of cylindricity error of the kiln tail and cylindricity error of the laying-off cover cylinder.