Stepless adjusting apparatus for angle of driving transmission shaft of three-roller fiber grinding machine

The utility model discloses a stepless adjusting apparatus for an angle of a driving transmission shaft of a three-roller fiber grinding machine. The stepless adjusting apparatus comprises a hand wheel, a worm, a worm gear, a rack core and a rack, wherein the worm is connected with the rack core; the rack core is fastened on the rack; the worm and a bearing gland are fastened on the rack via a bearing; the bearing is assembled on the worm gear; and the hand wheel is mounted on the worm gear. When the diameter and a screw pitch of a product change and adjustments are needed, a bolt is loosened and the hand wheel is rotated to drive the worm to rotate; and the rack core is driven by the worm gear to rotate surrounding the center of the rack until the rack core is adjusted in a desired position and the bolt is fastened, so an angle between the driving transmission shaft and the rack is changed and a stepless adjustment is achieved. The stepless adjusting apparatus for the angle of the driving transmission shaft