Structure introduction: The casing of the pit annealing furnace is a pit furnace structure, which is composed of high-alumina refractory bricks and aluminosilicate fibers. When the whole fiber is used for furnace lining insulation, the heating elements are generally heated by high-temperature resistance bands, which has a longer service life. Long and not easy to break. All automatic control of the well-type annealing furnace cover of our factory have safety protection. When the furnace cover is opened, the control power is automatically cut off. Heating can only be started when the furnace cover is tightly closed to ensure the safety of the operator.