A mechanism is designed to pull out the cotton stalks for the small-type caterpillar self-propelled pull-out cotton stalk machine. The mechanism is mainly composed of the rotating knife roller, the conveying screw tooth, the compression roller and the cleaning roller. For the complex terrain and different spacing in southern, it can pull out cotton stalks on different lines, clean the soil on the root of cotton, and not easy to pull off the cottons. The single factor and multi-factor orthogonal experiments are carried out on the basic factors of the movement speed of machine, the rotation spee...