Shield tunneling machine main driving sealing system self-adaptive to soil bin pressure change

The utility model discloses a shield tunneling machine main drive sealing system self-adaptive to soil bin pressure change, which comprises a fluid channel box, a friction ring, a sealing medium and aplurality of sealing rings, the fluid channel box is sleeved on the friction ring, an annular gap is formed between the fluid channel box and the friction ring, and the plurality of sealing rings divide the gap into a plurality of annular pressure cavities. An injection channel is formed in the fluid channel box, and the injection channel and the pressure cavity are filled with the sealing medium. According to the sealing method, the water and soil pressure and the working pressures are controlled to meet the following conditions: P2 = P1 + deltaP1, PN = PN1 deltaPN, deltaP1 is greater than 0, and deltaPN is greater than 0. According to the system, the working pressure of the main driving sealing system can be linked with the pressure change of the soil bin, so that the pressure bearing capacity of the main drivi