When the furnace temperature of the roller hearth furnace is lower than 950 ℃, cylindrical rollers with water-cooled shaft head and without water-cooled shaft head can be used;
When the furnace temperature is between 1000 and 1100 ℃, hollow rollers with water-cooled shaft are often used. Due to the large amount of heat taken away by the cooling water, some furnaces with a temperature of 1000-1150 ° C are made of steel to make water-free cooling furnace rolls.
The structure is that the two ends of the furnace roll body are welded to the active shaft and the passive shaft, respectively, at the center of the two shafts. 30mm holes are added to increase the heat dissipation area of the shaft and reduce the working temperature of the shaft.
High temperature refractory fiber is used as the core filling material for heat insulation. At the same time, the two ends of the furnace roll body are welded to the active shaft and the passive shaft respectively. High temperature refractory fiber is used as the shaft filler for heat insulation.
The integral type of the furnace roller brick is changed to a combined type to facilitate the replacement of the furnace roller. Materials commonly used for high-temperature rollers are formed by centrifugal casting.
The main parameters of the roller are roller diameter and wall thickness, which are related to the roller pitch, heating conditions, working conditions, furnace roller speed and load and other factors.
The design roller mainly calculates the bending stress of the roller. The roller has two basic requirements.
It is required that the bearing capacity of the roller is strong and the service life is long, and the furnace roller is light in weight and low in cost. In addition to the load of the charge, the load of the roller is also related to the quality of the roller itself, so the diameter of the roller should be selected reasonably.
Based on the load, calculate the required wall thickness. Theoretical calculations have shown that increasing the outer diameter of the furnace roll can reduce the wall thickness accordingly and reduce the quality of the furnace roll. The relative relationship is as follows:
Outer diameter (mm) 180 200 220 240
Wall thickness (mm) 12 10 9 8
Weight (kg) 167 158 157 154
The distance between the rollers should ensure that the charge placed on the rollers can run smoothly.
The center of gravity of the charge should always be within the support roller, and generally two rollers are required to support the charge.
The distance between the rollers should also be matched with the transmission chain, and the multiple of the chain pitch should be adopted.
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