Mold opening and closing mechanism of band-type brake-free two-plate type injection molding machine

The invention relates to the technical field of injection molding, and discloses a mold opening and closing mechanism of a band-type brake-free two-plate injection molding machine, the mold opening and closing mechanism comprises a fixed mold plate and a movable mold plate, the corner positions of the fixed mold plate and the movable mold plate are both provided with threaded rods, and the four threaded rods are all in threaded connection with driven gears; a gear ring used for being driven by the driven gear is embedded in the inner side of the movable mold plate, a limiting gear is connected to the outer side of the gear ring in a meshed mode, and limiting between the gear ring and the driven gear is achieved through the limiting gear, the gear ring and the driven gear. The four driven gears are synchronously meshed with the outer side of the gear ring, the limiting gears are meshed with the outer side of the gear ring, and the limiting gears are driven through the transmission rods, so that the movement di