Lower seat key type MWD anti-disengaging key system

The invention discloses a lower seat key type MWD anti-disengaging key system. The system involves a guiding mechanism and a circulating sleeve; the guide mechanism sequentially comprises a threaded connecting section and a bottom assembly which are integrally arranged, the connecting position of the bottom assembly and the threaded connecting section is fixedly sleeved with a sawtooth clamping ring, and the surface of the bottom assembly is provided with a key slot connected with a guiding module; a clamping groove is formed in the inner wall of the top end of an inner sleeve of the circulating sleeve, and a key block is arranged on the inner wall of the sleeve; the guiding mechanism is connected in the sleeve through the cooperation between the sawtooth clamping ring and the clamping groove and the cooperation between the key block and the key groove; the sawtooth clamping ring and the sleeve are matched with enough resistance to prevent radial movement, and the key groove, the key block and the guiding mod