Rear inflation device of vulcanizing machine

The invention relates to a rear inflation device of a vulcanizing machine. The rear inflation device comprises a lower chuck push-and-pull mechanism, an upper chuck lifting mechanism and a tire pushing mechanism, wherein the lower chuck push-and-pull mechanism comprises a lower chuck, a lower chuck fixing seat, a connecting frame, a push-and-pull air cylinder, a movable guide rod and a guide sleeve, the movable guide rod provides sliding movement of the lower chuck to a tire receiving position or an inflation position, and the lower chuck is fixedly connected with the connecting frame throughthe lower chuck fixing seat and is controlled by the push-pull air cylinder to move to the tire receiving position or the inflation position; and the upper chuck lifting mechanism comprises an upper chuck, an upper chuck fixing seat and a lifting oil cylinder, the upper chuck sleeves on the upper chuck fixing seat and is pressed and fixed by a pressing cover, and the upper chuck fixing seat is connected with the lifting o