Driving device and method for middle and rear rollers of spinning frame

The invention provides a driving device for middle and rear rollers of a spinning frame. Two ends of the middle roller and the rear roller are driven by two sets of driving motors and gear transmission systems with the same structure respectively. The driving device is characterized in that a front roller motor drives a front roller through a front gear box; a middle and rear roller motor drives arear roller through a middle and rear gear box and a middle and rear gear, and drives a second change gear on a first intermediate shaft through a first change gear simultaneously; a third change gear on the first intermediate shaft drives a gear fixed on the middle roller to drive the middle roller to rotate; a middle drive device is arranged in the middle of the middle roller and the rear roller and comprises a first intermediate gear fixed in the middle of the rear roller; the first intermediate gear is connected with a fourth change gear and drives a fifth change gear through a second intermediate shaft; the fift