High temperature and wear resistant double-layer composite hearth roll

Abstract

The invention discloses a high temperature and wear resistant double-layer composite hearth roll, which comprises a roller and roll shafts connected to both ends of the roller. The roll shafts are inserted into the ends of the roller to form cooperation and fixed connection. The roller is a double-layer composite cylinder, which is formed by compounding of an inner alloy layer and an outer quartz ceramic layer covering the alloy layer. Further improvements lie in that: two positioning pins radially running through cooperating parts of the roller and the roll shafts are disposed at the cooperating parts of the roller and the roll shafts, and one of the positioning pins partially runs through the other positioning pin. The double-layer composite hearth roll provided by the invention has the characteristics of high strength, high temperature resistance, low thermal expansion, good chemical stability, stable high temperature performance, no deformation, smooth and delicate surface, and good wear resistance, etc., the problems of roll surface oxidation and furnace roll nodulation are well solved, and loosening and peeling phenomena cannot come into being. The roller and the roll shafts are in reliable connection, and the connection strength is high, so that the double-layer composite hearth roll provided by the invention has high structural strength.

Description

technical field [0001] The invention relates to a hearth roll of an annealing furnace. Background technique [0002] The hearth roller of the annealing furnace includes a roller and a roller shaft connected to both ends of the roller. The roller shaft is inserted into the end of the roller to form a fit and be fixedly connected by welding. The hearth roller in the prior art is generally a single-layer cylinder structure made of heat-resistant alloy steel, and now there are also double-layer cylinder structures covered with graphite carbon sleeves or ceramic coatings on the heat-resistant alloy steel cylinder. However, the hearth rolls of these types of structures will have the phenomenon of roll surface oxidation, furnace roll nodulation, looseness and peeling, which will affect the quality of the produced products and normal production. Contents of the invention [0003] Aiming at the deficiencies of the prior art, the present invention provides a high-temperature-resist...

AI Technical Summary

Problems solved by technology

The hearth roller in the prior art is generally a single-layer cylinder structure made of heat-resistant alloy steel, and now there are also double-layer cylinder structures covered with graphite carbon sleeves or ceramic coatings on the heat-resistant alloy steel cylinder. However, the hearth rolls of these types of structures will have the phenomenon of roll surface oxidation, furnace roll nodulation, looseness and peeling, which will affect the quality of the produced products and normal production

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