Center mechanism of tire forming vulcanizer

The utility model discloses a center mechanism of a tire forming vulcanizer. The center mechanism of the tire forming vulcanizer comprises an upper ring oil cylinder and a lower ring oil cylinder. An upper ring oil cylinder guide sleeve is fixedly arranged on a main engine hot plate. A cylinder body of the upper ring oil cylinder is matched with the upper ring oil cylinder guide sleeve. Two sides of cylinder bodies of the lower ring oil cylinder are connected with the bottom of the upper ring oil cylinder and the bottom of the upper ring oil cylinder guide sleeve. A piston rod of the lower ring oil cylinder is connected to the bottom of the upper ring oil cylinder guide sleeve. A lower grip ring base body is arranged on the upper portion of the upper ring oil cylinder and on the top of the upper ring oil cylinder guide sleeve through a connecting base. An upper grip ring is arranged on an upper ring oil cylinder piston rod which stretches out of the connecting base and the lower grip ring base body. A displac