The construction principle of the box type resistance furnace is how to form a box type resistance furnace. The outer casing is generally welded by steel and steel plates. The small electric furnace is generally made of a bracket with a certain height because it needs to maintain the working surface. Below, there are legs or brackets that support the furnace body.
Large and medium-sized box-type resistance furnaces (muffle furnaces) can be equipped with electric heating elements on the guard door and on the back wall to reduce the temperature difference in the furnace. In order to ensure a better balance of heat loss at the furnace door, It can be used as a control zone on the larger box type electric furnace by 1/3 of the length of the furnace door. The furnace that protects the gas should be equipped with the necessary equipment to ensure safe operation and good tightness.
Large electric furnaces can be electrically or pneumatically and hydraulically opened and closed. The electric heating elements can generally be arranged on the left and right side walls and the bottom surface of the furnace. In order to obtain a good thermal field, the electric heating elements are also arranged on the roof. Because the height of the workpiece in the furnace generally does not exceed the width, the heating of the above two aspects is more effective than the two aspects.
The furnace door of small and medium-sized electric furnace can be opened and closed by counterweight and manual device. The lower part generally has sand sealing groove. Some furnace doors are also provided with sand sealing groove to ensure good sealing. When the furnace door is closed, it is pressed. The device allows the door to be in close contact with the door frame to reduce air leaks.
The medium-sized electric furnace is large in weight and the weight of the workpiece added to the furnace is also large, so the furnace body and the brickwork are generally welded directly on the chassis. The large electric furnace can be designed as a steel-free chassis on a specific dedicated foundation, and the bricks are welded in situ, but the electric furnace cannot be lifted and moved after installation.
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Details:
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