Four-cotton-sliver asynchronous inputting and three-level carding rotor spinning method and device

The invention discloses a device used in a multi-level carding rotor spinning method. The device comprises a spinning system and a computer control system. The spinning system comprises a feeding and carding mechanism, a gathering and twisting mechanism and a winding forming mechanism. The device is characterized in that the feeding and carding mechanism comprises a combined cotton feeding roller with four rotating freedom degrees and a multi-level carding roller, and the speed ratio of four roller bodies of the combined cotton feeding roller with the four rotating freedom degrees is adjustable. The yarn density and the blending ratio of rotor spun yarns can be adjusted and controlled at will.