First, hob and furnace shell
The role of the hob to bear the load of the lining and the workpiece and the support side of the furnace arch thrust (referring to the box-type furnace vault). Hob usually consists of steel welded into a frame, steel plate, the design reasonable hob and furnace shell should be strong enough, some unscrupulous manufacturers tend to cut corners with little or sheet instead of thick plates earn interest.
The furnace shell role is to protect the lining of, reinforcement furnace structure and maintain the tightness of the electric furnace, which is usually attached to the steel frame welded steel complex. Small laboratory furnace or not to set the oven rack, with thick steel plate welded furnace shell, may also play the role of the hob. The furnace shell thickness not generally in the 2 to 6 mm, and the hearth with a thicker steel plate, the side walls for availability thin steel sheet production. In addition to the protective atmosphere or controlled atmosphere furnace generally use intermittent welding.
Second, the lining
The lining of the role is to maintain the furnace temperature, reducing heat loss, good lining material only have a certain refractoriness, resistance to thermal shock, but also have less heat storage capacity and a certain intensity. The lining is usually the use of lightweight refractory bricks and fiber, except to the extent that it is required to support the site in the mouth or due to gravity.
Third, the furnace port device
Furnace mouth device includes a door (lid), door guides (oven panel) and the clamping device. Furnace mouth device should be well sealed, less heat loss, the door should be larger than the mouth, usually on each side of the door and mouth overlapping 65-130mm, controlled atmosphere furnace, furnace mouth should be tightly sealed. The door is usually made of cast iron or steel. And put silk brick door put silk brick should be higher than the door frame is indentation 10-15mm.
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