The electrode salt bath furnace (hereinafter referred to as the salt furnace) is one of the most widely used equipment in the heat treatment series. Although the salt furnace has the disadvantages of poor environmental conditions and high energy consumption, it can be used for product parts and processing. The non-oxidizing heating bright quenching, normalizing and quenching and tempering treatment of the mold, and because of its simple structure, convenient operation and low cost, so far salt furnaces are still widely used in some developed countries such as my country and Germany.

　　 The overall resistance furnaces produced and used inside and outside the market are all equipped with a furnace door or furnace cover. This is because the resistance furnace works by placing the workpiece in a basket, furnace pot or other air medium studio Heating, so easy to add furnace cover. The heating of the salt furnace is to hang the tied or hung workpieces in a salt bath with hanging tools such as furnace hooks for heating. If you add a furnace cover, hooks and other hanging tools, the furnace cover will be supported open, as if not Add stove cover. In addition, there is no convenient and reasonable opening and closing mechanism. So far, the salt furnace has been open-type heating without a furnace cover. It is this open-type heating that causes a large radiant heat loss. After calculation and testing, when the working temperature is 13000, the radiant heat loss of the salt bath surface reaches as much as 50%; when the working temperature is 850C, the radiant heat loss also reaches 32%.

　　 In addition to the large radiant heat loss, the conventional salt bath furnace also has the problem of slow start-up speed. Since the 1980s, different starting methods have appeared and applied, such as the "654" slagging starting method, the high-voltage breakdown current-preserving and decompression starting method, the low-voltage arc speed starting method, and the dual-function electrode direct starting method. In the starting method, the auxiliary electrode is removed (except for some starting methods for the first time). At the same time, the starting speed is accelerated to varying degrees and the electric energy is saved. However, the structure is complicated, the operation is troublesome, the reliability is poor, and the slag removal is difficult. It has shortcomings such as narrow adaptability and insecurity.

　　 In addition, the short life of the salt furnace has not been solved. Usually, the salt furnace crucible is made of full refractory bricks or full refractory cement. The salt furnaces made of refractory bricks are prone to salt seepage in the brick joints, causing the furnace body to bulge, and it will not be used soon. Using a salt furnace made of fully refractory cement with coke stone as aggregate, the furnace wall begins to fall off after a short period of use. The refractory cement sinks at the bottom of the furnace and is not easy to be removed, and the furnace gradually expands.

　　 The life of the salt bath furnace manufactured by the above two methods is generally about 3 months, which affects production and causes greater waste. If the salt furnace achieves closed heating through innovation and transformation, the energy saving can reach about 35%. If there are new changes in speed start technology and furnace body life, it will definitely be a reformative advancement in salt furnace technology, and it will definitely make the salt furnace Re-radiate youthful vitality.