Roller hearth furnace and method for heating workpieces

摘要

The present invention relates to a roller hearth heating furnace for heating a workpiece, wherein the roller hearth heating furnace is constituted by at least one heating furnace chamber accommodating a workpiece, and the chamber has at least two heating furnace side walls. At least one transport roller for transporting the workpiece through the furnace chamber is arranged inside the furnace chamber and each furnace wall has at least one opening through which the transport roller can move. At least one rolling bearing unit is arranged on each outer side of the furnace wall and the roller bearing unit is designed to receive and support the transport roller outside the furnace chamber. The roller hearth heating furnace is constituted by a flushing system for a rolling bearing unit, which flushing system is designed for passing flushing gas through a rolling bearing unit, which flushing gas flows from one side of the rolling bearing unit facing the furnace wall Passes through the rolling bearing unit, passes through the opening of the furnace wall, and can be injected into the chamber by the heating of the roller hearth furnace. The present invention relates to a method of heating a workpiece using a roller hearth furnace.