Automatic control system for fire-blocking firedoor of bogie-type gas furnace

The invention discloses an automatic control system for a fire-blocking firedoor of a bogie-type gas furnace. The fire-blocking firedoor is in sliding fit with an orbit at two sides of a hearth; the upper end of the orbit is provided with a firedoor raising photoelectric limit, the bottom end of the orbit is provided with a firedoor falling photoelectric limit, and the top of the orbit is provided with a firedoor electric hoist; the firedoor electric hoist is connected with the fire-blocking firedoor through a steel wire rope; two sides of the hearth are respectively fixed on a top seal air cylinder opposite to the fire-blocking firedoor; the top seal air cylinder is provided with a limiting block for pressing the fire-blocking firedoor; the upper part of the hearth is provided with a safety pin air cylinder opposite to the fire-blocking firedoor; a pin hole matched with the safety pin air cylinder is formed in the bottom of the fire-blocking firedoor; the safety pin air cylinder is provide d with a safety pi