Plate strip hot continuous rolling reeling temperature control method based on thermodetector

A technology of coiling temperature and control method, applied in the direction of temperature control, etc., can solve the problems of system over damping or oscillation, failure to give optimal control law, poor control effect, etc.

Inactive Publication Date: 2012-06-20
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] So far, there are many methods for controlling the coiling temperature of strip steel, but these methods often lack practicality. Usually, the parameters of the controller are selected according to experience, and a clear optimal control law cannot be given. If the controller parameters Improper selection, the system is prone to over-damping or oscillation, so the control effect is not good

Method used

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  • Plate strip hot continuous rolling reeling temperature control method based on thermodetector
  • Plate strip hot continuous rolling reeling temperature control method based on thermodetector
  • Plate strip hot continuous rolling reeling temperature control method based on thermodetector

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Embodiment 1

[0124] In this embodiment, the rolling steel type is selected as Q235B, the incoming material thickness is 6.0mm, the rolling speed is 8.0m / s, the specific gravity is 7850kg / m3, and the specific heat is 0.812kJ / (kg·℃); The length is 0.585m; the distance from the thermometer to the header that needs to be opened and closed is 6m; the heat flux density of each finely adjusted header is 6665304.81kJ / (m2.h); the time required for the opening and closing of the control valve and the water falling to the strip steel 700ms;

[0125] In this embodiment, a method for controlling the coiling temperature of strip hot rolling based on a thermometer, such as Figure 7 shown, including the following steps:

[0126] Step 1: Input the relevant data of cooling equipment and steel strip into the computer, the thickness of the incoming material is 6.0mm, the rolling speed is 8.0m / s, and the heat flux density of each fine-tuned header is 6665304.81kJ / (m 2 .h), specific gravity 7850kg / m 3 , the...

Embodiment 2

[0146] In this embodiment, the rolling steel grade is selected as Q345B, the thickness of the incoming material is 4.0mm, the rolling speed is 10.0m / s, the specific gravity is 7850kg / m3, and the specific heat is 0.7985kJ / (kg·℃); The length is 0.4m; the distance from the thermometer to the header that needs to be opened and closed is 5.8m; the heat flux density of each fine-tuned header is 6665304.81kJ / (m2.h); the opening and closing of the control valve and the water falling to the strip require The time is 700ms;

[0147] In this embodiment, a method for controlling the coiling temperature of strip hot rolling based on a thermometer comprises the following steps:

[0148] Step 1: Input the relevant data of cooling equipment and strip steel into the computer, select the rolling steel type: Q345B, the incoming material thickness is 4.0mm, the rolling speed is 10.0m / s, and the heat flux density of each fine-tuned header is 6665304.81kJ / (m 2 .h), specific gravity 7850kg / m 3 , t...

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Abstract

The invention relates to a plate strip hot continuous rolling reeling temperature control method based on a thermodetector and belongs to the technical field of automatic control in the rolling process. The invention provides a method for tracking the plate strip change length and solves the problem that the retardation time is changed along with the rolling speed in the traditional method. A Smith estimation control method is applied to a reeling temperature control system and a control law of a controller in the form of integral is provided. Compared with the traditional control method, the method provided by the invention is high in response speed and high in static control precision and can be widely applied to production of hot continuous rolling plate strips, so that the reeling temperature precision of the plate strip products can be improved.

Description

technical field [0001] The invention belongs to the technical field of rolling process automatic control, in particular to a method for controlling the coiling temperature of strip hot continuous rolling based on a thermometer. Background technique [0002] In the hot continuous rolling strip production process, one of the most commonly used coiling temperature control methods is to measure the actual temperature of the strip through a thermometer, and then adjust the number of laminar cooling headers to control the temperature of the strip. Perform feedback control. Due to the requirements of strip temperature measurement accuracy and for the maintenance of the thermometer, the thermometer before coiling is usually installed 5000mm or even farther away from the laminar flow cooling, and the valve itself is opened and closed and the cooling water falls to the surface of the strip It also takes a certain amount of time, such as figure 1 The actual temperature value detected...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21B37/74
Inventor 孙杰姬亚锋彭文刘恩洋曹剑钊李旭张殿华
Owner NORTHEASTERN UNIV
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