Roller-hearth type plate continuous tempering furnace and tempering method thereof

Abstract

The invention discloses a roller-hearth type plate continuous tempering furnace, comprising a furnace body, a loading device and an unloading device, wherein the loading device and the unloading device are arranged at two ends of the furnace body; the furnace body comprises a strong convection heating section and an open fire heating / holding section which is connected with the strong convection heating section; a hearth of the strong convection heating section is communicated with a hearth of the open fire heating / holding section; the furnace body is provided with a conveying roller which is used for conveying a plate; the conveying roller runs through the hearths of strong convection heating section and the open fire heating / holding section; the strong convection heating section is provided with a strong convection blowing and heating device which is used for circularly heating and blowing hot air; an open fire nozzle, a furnace gas disturbance fan and a hot air jet pipe are arranged in the open fire heating / holding section; the loading device comprises a loading roller which is connected with a feeding end of the conveying roller; and the unloading device comprises a discharge roller which is connected with a discharge end of the conveying roller. The roller-hearth type plate continuous tempering furnace disclosed by the invention is capable of achieving the multi-purpose function, and simultaneously is high in furnace temperature control accuracy.

Description

technical field [0001] The invention relates to the field of heat treatment of plates, in particular to a roller bottom continuous tempering furnace for plates and a tempering method thereof. Background technique [0002] At present, in large-scale steel plate heat treatment workshops, in order to achieve continuous high production, the heat treatment of steel plates adopts roller hearth continuous heat treatment furnaces. Usually the temperature of quenching furnace and normalizing furnace is between 900 ~ 1000 ℃, regardless of the indirect heating of radiant tube or direct heating of open flame burner, the requirements of furnace temperature control accuracy, furnace temperature uniformity, and steel plate heating uniformity are easy to achieve. However, for tempering furnaces, especially medium and low temperature tempering furnaces, the furnace temperature is between 200 and 400°C. Due to the relatively low temperature, the heat transfer method has changed from radiation...

AI Technical Summary

Problems solved by technology

However, for tempering furnaces, especially medium and low temperature tempering furnaces, the furnace temperature is between 200 and 400°C. Due to the relatively low temperature, the heat transfer method has changed from radiation-based heat transfer to heat convection. , using traditional open flame or radiant tube heating, there are problems of slow heating speed and poor temperature uniformity, so the product quality cannot be guaranteed, which is not conducive to the development of high-end products

[0003] For this reason, in order to realize the medium and low temperature heat treatment process of steel plates, trolley-type heat treatment furnaces are usually used. The principle is to conduct low-temperature heating by feeding hot gas with controllable temperature. The output is low and the steel plate is easily deformed

In addition, the tempering methods of the tempering furnace include high-temperature tempering, medium-temperature tempering, and low-temperature tempering. Generally, it is necessary to build a medium-high temperature tempering furnace and a low-temperature tempering furnace to achieve high-temperature tempering and medium-temperature tempering respectively. And low-temperature tempering, so there are problems such as large equipment footprint, high investment cost and waste of capacity in intermittent production

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