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A Control Method for Preventing Steel Strip Running Off

A control method, a technology of strip steel deviation, applied in heat treatment process control, manufacturing tools, furnaces, etc., can solve problems such as strip steel deviation, reduce temperature difference, avoid lateral temperature difference stress, and avoid deviation problems Effect

Active Publication Date: 2021-07-09
SHOUGANG JINGTANG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention solves the technical problem of strip steel deviation occurring in the prior art by providing a control method for preventing strip steel deviation, and realizes the technical effect of preventing strip steel deviation

Method used

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  • A Control Method for Preventing Steel Strip Running Off
  • A Control Method for Preventing Steel Strip Running Off
  • A Control Method for Preventing Steel Strip Running Off

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Embodiment Construction

[0036] The embodiments of the present invention provide a control method for preventing strip deviation, which solves the technical problem of strip deviation in the prior art, and achieves the technical effect of preventing strip deviation.

[0037] The technical solution in the embodiment of the present invention is to solve the above-mentioned problems, and the general idea is as follows:

[0038] According to the maximum thickness and the thinnest thickness of the strip steel in the furnace designed by the unit, the critical thickness of the strip steel deviation in the cooling section is obtained, and this thickness is used as the activation condition of the control, thereby starting the cooling fan along the moving direction of the strip steel, Control the speed ratio of the cooling fan to gradually increase. With the gradual increase of the speed ratio of the cooling fan, it means that the flow rate of the cooling gas at the bottom of the annealing furnace for heat excha...

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Abstract

The invention discloses a control method for preventing deviation of strip steel. According to the maximum thickness and the thinnest thickness of the strip steel in the furnace designed by the unit, the critical thickness of the strip steel deviation in the cooling section is obtained, and this thickness is used as the activation condition of the control, thereby starting the cooling fan along the moving direction of the strip steel, Control the speed ratio of the cooling fan to gradually increase. With the gradual increase of the speed ratio of the cooling fan, the flow rate of the cooling gas used to exchange heat with the strip at the bottom of the annealing furnace is higher than the flow rate of the cooling gas at the top of the annealing furnace. By increasing the bottom fan Increase the heat transfer rate of the cooling gas at the bottom to achieve rapid cooling at the bottom. Through the bottom rapid cooling mode, the temperature of the strip steel is lowered before the strip steel contacts the bottom furnace roll, which reduces the temperature difference between the furnace roll and the strip steel, and avoids the contact between the hot strip steel and the cold furnace roll in the width direction. The phenomenon of strip deviation occurs due to lateral temperature difference stress.

Description

technical field [0001] The invention relates to the technical field of annealing, in particular to a control method for preventing deviation of strip steel. Background technique [0002] In the strip steel annealing process, the strip steel passes through each area of ​​the annealing furnace successively through furnace rollers in the vertical annealing furnace, thus completing the entire annealing process. However, when the strip runs around the furnace roll, if there are problems such as poor strip shape, uneven temperature of the strip, tension fluctuation, wear of rollers or bearings, or excessive errors in equipment manufacturing, processing and installation, etc., it may cause the strip to run away. Offset, and these factors are intertwined and interact, making the deviation of the strip on the unit more complicated. [0003] From January 2016 to April 2017, the deviation of 1700 continuous annealed strips in the annealing furnace was statistically analyzed. A total o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/573C21D11/00C21D1/26
CPCC21D1/26C21D9/573C21D11/005
Inventor 王道金任伟超李靖陈文武刘宗发郑晓飞张晓峰谭谨峰康永华幺洪丹王琳郝柳
Owner SHOUGANG JINGTANG IRON & STEEL CO LTD
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