Importance

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Abstract

A double walking beam furnace for the heat treatment of individual articles which includes a transport apparatus for conveying the part to be treated through the furnace, the transport apparatus including two groups of longitudinal beams which alternately transport the parts in a stepwise manner. The longitudinal beams are alternately arranged in spaced relationship to one another, and a sub-structure is provided beneath each beam to carry the beam and move together therewith. The sub-structure effect both a perpendicular movement and a horizontal movement, in the longitudinal direction of the furnace, of the longitudinal beams. A fixed water trough is provided between each two adjacent sub-structures, which extends approximately over the entire length of the furnace or hearth and is not movable together with the sub-structures, which extends approximately over the entire length of the furnace or hearth and is not movable together with the sub-structure. Dip skirts arranged on the adjacent sub-structures and movable therewith are immersed in the water troughs in order to seal the furnace at its bottom in a gas-tight manner. The water troughs are made up of separate longitudinal channels which are substantially flangeless and welded or bonded to one another at their abutting end faces.

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First Claim