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$200000
Continuous Casting Mold Level Control System

其他待售物品
Posted 8 months ago
35 views

$200000
Continuous Casting Mold Level Control System

其他待售物品
Posted 8 months ago
35 views
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Description

Overview

The automatic control for the molten steel level of the mold is one of the key technologies of continuous casting production. It is very important to reduce the labor intensity of workers, improve production efficiency, improve the quality and output of casting billet, reduce overflow and breakout of steel and improve the management level of steelmaking and continuous casting.

The molten steel is poured into the mold. In order to prevent overflow, the molten steel level must be kept stable. Otherwise, during the casting process, if the level will fluctuate too much, and slag will be involved, forming surface slag inclusion on the surface of the casting billet, affecting the quality of the billet. The test points out that the relationship between the level fluctuation and the depth of casting billet surface slag inclusion is as follows:

The experience has shown that surface slag inclusions can be eliminated when the level fluctuation is within ±10mm. At the same time, if the level fluctuation is more than 10mm, the rate of longitudinal cracks on the casting billet surface is 30%. It means that the level fluctuation directly affects the surface quality of the casting billet.







The principle of the system

The eddy current type molten steel level gauge is the key to the system. The system operates reliably and has excellent performance: high temperature resistance, strong anti-interference ability, fast dynamic response (lag time <0.10s), high detection accuracy (<±05mm), and large measurement range (0-150mm). The selected electromagnetic field frequency ensures that the level detection probe only detects the level change of the mold and does not detect the mold flux or steel slag layer. The system has the advantages of simple operation and no radiation protection problems. The system is insensitive to argon blowing, and its sensors can be mounted on the tundish car or on the platform.

The sensor is cooled by compressed air during use.



The control principle of the system

The system can be set to four control modes: automatic, semi-automatic, manual and motor clutch. The automatic mode is the closed-loop control system of the molten steel level, and control the opening of the stopper by the digital actuator; the semi-automatic mode uses opening degree setter and digital actuator to set the opening of the stopper manually; the manual mode is to open and close the button directly to control the opening of the stopper; the motor clutch mode is quickly changed from any of the above control methods to manual stopper operation.

The functions of the system also include: display and record of molten steel level, nozzle opening and casting speed; setting of molten steel level and nozzle opening; alarm of molten steel level at limit value etc.

In addition to taking the detection of molten steel level as the main feedback signal of the control system, the control system also considers various interference factors that have an impact on the level control. These interference factors include:

1. The influence of the change of the flow characteristics on the control system after the melt loss of the stopper

2. The influence of the weight change of molten steel in the tundish on the control system

3. The influence of the change of the casting speed of the continuous casting machine on the control system

4. The influence of the mold width change (the mold width is adjustable) on the control system

5. The influence of the vibration frequency and amplitude of the mold on the molten steel level gauge



The function and software implementation

In order to overcome these disturbances, the mold level control strategy adopts PID control. And on the basis of PID control, self-adaptive correction and feedforward control are introduced to form an advanced control system. The level control is the main loop, and there is a proportional gain of the main loop controller. According to the self-adaptive correction of the mold width change and feedforward compensation of casting speed, so as to further reduce and eliminate liquid level fluctuations caused by mold width adjustment and casting speed changes.

In order to reduce the frequent action of the stopper, the system adopts the intergarting time change of the controller, and automatically selects a longer intergarting time when the molten steel level fluctuates lightly. And the system will choose a shorter intergrating time when molten steel level fluctuates greatly. Thereby, the fluctuation of the controlled object caused by the frequent action of the stopper rod is suppressed.

In the signal processing of molten steel level gauge, an appropriate filtering link is added and the vibration frequency synchronous filter is used for filtering processing, which can overcome the interference of mold vibration frequency and amplitude variation.

Attributes

Condition: New
Transaction: Sell

Floria Liang 的个人简介

Floria Liang
Floria Liang Registered for 8+ months Last online 7 months ago
Seller's description 武汉中飞扬测控工程有限公司是一家专业从事自动化产品及工程的高新技术企业,业务范围包括自动化系统、装置与各类仪器仪表研发、生产及销售、控制系统设计、实施及提供全面自动化系统与过程控制解决方案的综合型自动化公司。
公司拥有一支高素质的设计与研发技术队伍,及专业的机加工工厂,具有成熟的高技术含量的产品以及雄厚的技术开发与工程实力,在工业控制系统集成、信息系统的集成应用方面积累了丰富的经验。并与国内外大专院校和科研院所紧密合作。经过多年的稳步、健康发展,在工业自动化、建筑智能化、网络信息化领域中,集开发设计、系统集成、工程实施、设备成套相结合的高科技企业发展模式已经形成。
公司专注于冶金测控及自动化产品的研发,致力于钢铁冶金过程自动化的关键测量与控制的研究,公司的冶金测控产品涵盖焦化、烧结、炼铁、炼钢、连铸、轧钢整个工艺过程,并在全国各大钢厂普遍应用。在专用控制领域,公司开发针对相关工艺的系列测控产品,能独立实现专用测控,并能与基础自动化系统和过程自动化系统无缝连接。能够为用户提供完善的系统测控、自动化的全面解决方案。
武汉中飞扬测控工程有限公司真诚希望通过全面周到的技术支持、极富竞争力的产品及高质量的解决方案为贵公司提供优质、满意、长期、稳定的全方位服务。
Building 4, Hengxin Industrial Park, No. 8 Xinhua Avenue, Huangpi District, Wuhan, Hubei Province, C, 430000, Wuhan, Wuhan, Hubei, China

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    Seller details Details

    Floria Liang
    Floria Liang
    27 active listings
    Trade Seller
    Registered for 8+ months
    Last online 7 months ago
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    Listing location

    Building 4, Hengxin Industrial Park, No. 8 Xinhua Avenue, Huangpi District, Wuhan, Hubei Province, C, 430000, Wuhan, Wuhan, Hubei, China
    30.5951051, 114.2999353

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    $200000 Continuous Casting Mold Level Control System Floria Liang
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