Structure introduction: The shell of the pit type carburizing annealing furnace is a pit type furnace body structure, which is composed of high-alumina refractory bricks and aluminosilicate fiber composite insulation. When the whole fiber is used for the furnace lining insulation, the heating elements are generally heated by high temperature resistance bands. Longer life and less likely to break. All automatic control of the well-type annealing furnace cover of our factory are protected. When the furnace cover is opened, the control power is automatically cut off, and the heating can be started only when the furnace cover is tightly closed to ensure the operator.