Shaking expansion and shrinkage device of automatic shaking machine

The invention discloses a wringing expansion and contraction device of an automatic wringing machine, which comprises a main shaft, an inner fixed sleeve, an inner movable sleeve, an outer fixed sleeve and an outer movable sleeve are symmetrically distributed at two ends of the main shaft, the inner fixed sleeve and the outer fixed sleeve are fixedly connected with the main shaft, the inner movable sleeve and the outer movable sleeve are respectively connected with the main shaft in a sliding manner through bearings, and a connecting rod is connected between the inner movable sleeve and the outer movable sleeve. Supporting rods are circumferentially and uniformly distributed on the outer walls of the inner and outer fixed sleeves, one ends of the supporting rods are hinged to the inner and outer fixed sleeves, the other ends of the supporting rods are respectively hinged to the shed rods, meanwhile, pull rods corresponding to the supporting rods are circumferentially and uniformly distributed on the outer wal