Worm and gear structure capable of automatically eliminating backlash

The utility model discloses a worm and gear structure capable of automatically eliminating backlash, which comprises a worm, a box body and a servo feed motor, a worm gear is arranged in the box body, the worm gear is connected with an upper part and a lower part through a spring arranged in the middle, and the worm is arranged between the box body and the servo feed motor; the two compression nuts are installed on the two sides of the worm gear, and the compression nuts are in a step shape. A dividing head main shaft, a first roller bearing and a second roller bearing are further installed in the box body, and the first roller bearing and the second roller bearing are installed on the surfaces of the two sides of the dividing head main shaft; a dial plate is mounted at one end of the dividing head spindle; according to the utility model, the worm gear is divided into two parts by using the spring with proper torque, so that the worm gear and the worm keep gapless transmission movement within a certain range,