... parts, one end of the connecting shaft eccentric gear, central part of the lift plate; and left ... the lower part is the cover, the Eccentric gear sets exposed at the lower end of cover. ... of the inner cavity are consistent with the helical screw alveolus. Taking into account the increase of ... sleeve, 3, the right sleeve, 4, eccentric gear, 5, lift plate, 6, helical gear, 7 pin, 8, positioning holes, 9, ...