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box-type resistance furnace is mainly composed of furnace frame, furnace shell, furnace lining, furnace door device, electric heating element and auxiliary device.

Next, let’s understand the role of each part of the box-type resistance furnace

1. Furnace frame: The function of the furnace frame is to bear the load of the furnace lining and the workpiece. It is usually welded into a frame with section steel and coated with steel plate. The small box-type resistance furnace does not need to be equipped with a furnace frame, and the furnace shell is welded by thick steel plates, which can also play the role of a furnace frame. To a certain extent, it also plays a protective role.

2. Furnace shell: The function of the furnace shell is to protect the furnace lining, strengthen the structure of the electric furnace and maintain the airtightness of the electric furnace. It is usually welded with steel plates overlaid on the steel frame. The reasonable design of the furnace frame and the furnace shell has sufficient strength.

3. Furnace lining: The function of the furnace lining is to protect the temperature of the box-type resistance furnace and reduce heat loss. A good lining material must not only have a certain degree of refractoriness, resistance to rapid cold and rapid heat, but also have less heat storage. The furnace lining is composed of refractory materials and heat preservation materials, the refractory material is close to the electric heating element, and the heat preservation material is close to the outer shell. In order to reduce heat loss, the lining of the general box furnace adopts a three-layer heat insulation design, and the inner layer uses refractory materials, such as polycrystalline mullite fiberboard and zirconium-containing fiberboard; the middle and outer layers use insulation materials, high aluminum or standard Ceramic fiber board, felt, fiber blanket, etc. The lining of the medium-temperature box furnace is made of light refractory and thermal insulation materials such as high alumina or aluminum silicate refractory fiber, and fiber blanket materials are generally used in the layer near the furnace shell. Due to the low temperature of the low-temperature box furnace, the material requirements of the refractory layer and the insulation layer are not high, and the general aluminum silicate refractory fiber can meet the requirements. In this way, the electric furnace can be protected more effectively.

4. Furnace door: The furnace door of the box furnace is generally made of cast iron or steel plate. A safety limit switch is installed on the furnace door opening device and is associated with the heating control power supply. When the furnace door is opened, the control power supply is cut off to protect the operation. The safety of the person. In order to facilitate the observation of the heating in the furnace cavity, an observation hole is usually designed in the center of the furnace door. This facilitates a good monitoring of the operation of the box furnace.

5. Heating elements: The heating elements of box-type resistance furnaces often use resistance wires, silicon carbide rods, silicon molybdenum rods, etc. Their main function is to heat up.

6. Auxiliary device: The auxiliary device of the box furnace is mainly a thermocouple, which is used for temperature measurement. Insert the thermocouple directly into the furnace cavity to monitor the temperature at different points in the furnace cavity.

The above is the introduction of the box-type resistance furnace manufacturer on the main components of the box-type furnace and the role of each part. If necessary, please consult us.