Device for directly electrifying and heating steel belt by using molten metal electrode

Abstract

The invention provides a device for directly electrifying and heating steel belt by using a molten metal electrode. The device comprises an insulating metal box and a steel belt passing through the insulating metal box, wherein two molten metal boxes corresponding to the steel belt are arranged in the insulating metal box; a molten metal layer corresponding to the steel belt is arranged in each molten metal box; and the two molten metal boxes are connected with secondary electrodes of a transformer respectively. The high-temperature molten metal layer and the steel belt are well contacted with excellent conductivity, so electric sparks between the steel belt and the molten metal layer are prevented; and the steel belt and the molten metal layer are in soft contact, so the steel belt cannot be strained. The device has a simple structure, is convenient to manufacture, and has the thermal efficiency reaching 90 to 95 percent.

Description

technical field [0001] The invention relates to the field of heat treatment of steel strips, in particular to a direct electric heating device for steel strips of liquid metal electrodes. Background technique [0002] When the steel strip is heat-treated, it is necessary to heat the steel strip, which is generally heated by a resistance box furnace. This kind of device first heats the muffle tube to about 900 degrees with a energized resistance wire through thermal radiation, and then passes Thermal radiation heats the steel strip in the muffle tube to 840-870 degrees, making the steel strip completely austenitized. This kind of equipment is bulky, has a large heat dissipation area, and large heat loss. In addition, the heat transfer path is complicated, and its thermal efficiency is only Around 35-45%. There is also a steel strip heating equipment that uses high-frequency induction heating. Its thermal efficiency can reach 50-70%, but its equipment is more complicated, esp...

AI Technical Summary

Problems solved by technology

The difficulty in the design of heating the steel strip by direct energization is the design of the electrode. If a plate electrode is used, the steel strip is constantly moving, and there is relative movement between the electrode and the steel strip, which is likely to generate electric sparks and damage the steel strip; If a roller electrode is used, it is necessary to use a brush to transmit electricity to the roller electrode, which makes the electrode structure very complicated and difficult to manufacture.

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