Roller hearth heat treatment furnace is plate heat treatment production line in standard configuration, state of the furnace bottom roll is good or not will directly affect the appearance and quality of steel plate factory.Production of furnace bottom roll bending roll and roll breakage problems sometimes. 
The cause of the furnace bottom roll bending is:
1) for a long time to a halt
Stalling for a long time will lead to the furnace bottom roll bending, stalling blackouts, coupling fault reasons and poor lubrication, etc. 
2) overload
When the continuous production of more than design specifications of the plate thickness will result in furnace bottom roll bending.As in the continuous production thickness is more than more than 100 mm thick plate, is easy to appear this kind of problem.