Pipe inner combustion type nodular casting iron pipe conformal furnace shell annealing furnace

Abstract

The invention provides a pipe inner combustion type nodular casting iron pipe conformal furnace shell annealing furnace, comprising a conformal furnace shell, a riding wheel mechanism and a heating mechanism, wherein the riding wheel is mounted at the lower part of the conformal furnace shell; the conformal furnace shell is composed of an upper retractable cover and a lower fixed casing which are hinged together, and the upper retractable cover is connected with a retractable mechanism capable of opening or closing the upper retractable cover; and the heating mechanism comprises thermal storage burners, blast pipes and fuel inlet pipes, both ends of the conformal furnace shell are respectively provided with the thermal storage burner, the thermal storage burner at each end is provided with the blast pipe and the fuel inlet pipe, the fuel inlet pipe is connected with a fuel pipeline via a fuel switch valve, and the blast pipe is connected with a combustion fan and a smoke exhaust fan via a reversing valve. The pipe inner combustion type nodular casting iron pipe conformal furnace shell annealing furnace provided by the invention enables burner flames to be directly sprayed in the pipe inner cavity of a nodular casting iron pipe so as to heat from the pipe inner wall to the outside, thus facilitating cast pipe charging, reducing the inner space of a furnace shell chamber, having small heat loss, effectively improving heat efficiency, shortening the pipe temperature heating time and enhancing productivity.

Description

technical field [0001] The invention relates to an annealing furnace used for heat treatment of large-diameter ductile iron pipes, and belongs to the technical field of cast pipe annealing furnaces. Background technique [0002] After the ductile iron pipe is cast, annealing heat treatment is required to obtain good mechanical properties. At present, there are two types of annealing furnaces used for ductile iron cast pipes: horizontal and vertical. The horizontal furnace is divided into tunnel-type continuous annealing furnace and trolley-type discontinuous annealing furnace. Most of the DN80-1200 pipes are water-cooled. The production of metal-type high-efficiency centrifugal pipe casting machines is suitable for supporting tunnel-type continuous annealing furnaces. The production efficiency of the tube machine is low. If a tunnel type continuous annealing furnace is used, the cost of the furnace body is too high, and the high annealing efficiency cannot be exerted. Ther...

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Problems solved by technology

[0004] Aiming at the structural characteristics of large-diameter ductile iron cast pipes and the problems of low production efficiency and large heat energy consumption in existing annealing furnaces, the present invention provides a low cost, high thermal efficiency, low annealing cost and can improve production efficiency. Annealing Furnace with Shaped Ductile Iron Tube

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