Keywords: electric furnace, heat treatment, quenching, stainless steel, annealing, various copper, Muffle furnace, furnace shell,

　　Electric furnace structure and maintaining the tightness of electric furnace
　　Continuous gas-protected bright heat treatment electric furnace for steel strip: it is used for continuous production of bright quenching of martensitic stainless steel, bright annealing (solid solution) treatment of austenitic stainless steel, intermediate recrystallization annealing, final annealing and stress relief treatment of various copper and copper alloys. The furnace design is novel, the structure is reasonable, the energy saving and the thermal efficiency is high, the production quality is stable, and the use is safe and convenient. Simple operation, no industrial pollution. Advanced temperature control methods, the use of intelligent temperature control instruments, intelligent SCR, Schneider electrical switch. & nbsp;& nbsp; Temperature control accuracy  1. C. In the industrial furnace has advanced, reliability, practicality, economy. This equipment is composed of transmission system, heating system, cooling system, control system and ammonia decomposition gas supply system.
　　Muffle furnace bladder is made of imported high temperature resistant stainless steel material by pressing and welding. Removable electric heating element is heated up and down; Steel belt conveys stepless speed regulation, liquid ammonia decomposed (hydrogen 75%, nitrogen 25%) mixed gas enters the furnace chamber to achieve gas protection effect, gas direction adjustment device to ensure a stable atmosphere. After the heat treatment of the equipment, the surface of the product is bright, no oxidation phenomenon, and the consistency of the processed product is good. & nbsp;& nbsp; The design of the ordinary heat treatment resistance furnace mainly considers the key parts such as the furnace frame, furnace shell, furnace lining, furnace mouth device, etc. The role of the furnace frame and furnace shell furnace frame is to bear the load of the furnace lining and workpiece and support the side thrust of the furnace arch (refers to the box furnace arch). The furnace frame is usually welded into a frame by section steel and covered with steel plates. The furnace frame and furnace shell with reasonable design should have sufficient strength. Some bad manufacturers often cut corners and use less or use thin plates instead of thick plates to make profits.

　　The function of the furnace shell is to protect the lining, strengthen the structure of the electric furnace and maintain the tightness of the electric furnace. It is usually welded on the steel frame with steel plates. For small experimental furnace also can not set the furnace frame, with thick steel plate welded to form the furnace shell, can also play the role of the furnace frame. The thickness of the furnace shell is different from 2-6mm, the furnace bottom is made of thicker steel plate, and the side wall can be made of thinner steel plate. Except for protective atmosphere or controlled atmosphere furnace, intermittent welding is generally used. & nbsp;& nbsp; Lining The role of furnace lining is to maintain the furnace temperature and reduce heat loss. A good furnace lining material must not only have a certain degree of refractoriness, resistance to rapid cooling and heat, but also have less heat storage and certain strength. The lining is usually made of lightweight refractory bricks and refractory fibers, except at the mouth of the furnace or at a location that needs to be supported by gravity. 3. furnace opening device The furnace opening device includes a furnace door (furnace cover), a furnace door guide plate (furnace panel) and a pressing device. The furnace mouth device should be well sealed, with less heat loss. The furnace door should be larger than the furnace mouth. Usually, the furnace door and the furnace mouth overlap 65-130mm on each side. For controlled atmosphere furnaces, the furnace mouth should be strictly sealed. Furnace doors are generally made of cast iron or steel plate. The silk brick of the furnace door with silk brick shall be indented by 10-15mm

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