Opening and closing device facilitating dismounting and mounting of stopper rod

The opening and closing device comprises a driving mechanism, a carrier plate, a U-shaped limiting insertion plate, a U-shaped fixing plug pin, a connecting rod and the stopper rod, an opening groove is formed in one end of the carrier plate, the top of the carrier plate is fixedly connected with two sets of limiting plates, and the limiting plates are fixedly connected with the U-shaped limiting insertion plate and the U-shaped fixing plug pin. The two sets of limiting plates are arranged on the two sides of the open groove respectively, the number of each set of limiting plates is two, a positioning block is arranged between the two limiting plates, the positioning block is fixedly connected with the carrier plate, and first insertion holes are formed in the surfaces of the limiting plates. The connecting rod can be preliminarily positioned by matching with the positioning block, the connecting rod can be further limited by inserting the U-shaped limiting insertion plate and the U-shaped fixing insertion pi