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Know the design of muffle furnace door and door guide plate?

The door structure of the muffle furnace is basically the same. It consists of a steel frame, cast iron edges and a fire-resistant insulation lining. Cast iron edges are not used in low temperature and low temperature heat treatment furnaces.
electric muffle furnace
 The frame of the muffle furnace is welded with I-beam or channel steel. The thickness of the surrounding steel plate is 10-20mm. The thickness of the outer steel plate of the lining layer is 3-4 mm. The thickness of the lugs is 16-40 mm. The thickness of the ribs is 6-10mm. Q235-A carbon structural steel is used to make the frame.
 The space between the lifting lugs of the furnace door is L1 = 0.5B, B is the width of the furnace door frame, and the space between the I-beam and channel steel is L2 = 600~800mm.

HT200 gray cast iron is mainly used for heat treatment furnace door, RQTSi4 high silicon heat-resistant cast iron is mainly used for car furnace door.

 Door guides can be divided into water-cooled and non-water-cooled structures. The non-water-cooled door guide structure can be used in heating furnaces and heat treatment furnaces. When used in a heating furnace, use RQTSi4 high silicon heat-resistant cast iron, and other parts use HT200 gray cast iron. The water-cooled furnace door guide plate has the characteristics of light weight, small deformation and long service life. The water-cooled furnace door guide plate is welded with 12-15mm steel plate. After welding, a water pressure test is required. Usually, 0.5MPa water is put into the welding grid and there is no leakage within 5 minutes.

 The muffle door lining is composed of refractory bricks and insulation bricks, or refractory bricks, insulation fillers and asbestos boards. At present, the most commonly used lining is the all-fiber furnace door lining, which is made of refractory fiber felt (blanket).

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