用于多塔式立式活套的解耦控制技术

在大型高速连续退火机组中,多塔式立式活套中活套位置的平衡控制和活套内带钢的恒张力控制一直都是此类机组控制的重点和难点。本文提出一种用于多塔式立式活套位置平衡与恒张力控制的解耦技术,可有效抑制塔间位置平衡调节对活套内带钢张力的影响,实现与带钢张力控制完全解耦的活套位置平衡调节。通过在华东某冷轧厂1450mm连续退火机组工程的成功运用,证明该技术控制精度高、响应快、性能稳定,可在同类生产线上广泛应用。     

改进的活套控制技术开发与应用

活套控制是热连轧精轧热负荷调试过程中首先要投入的动态控制功能,是保证带钢宽度和厚度质量控制能否稳定的前提。在宝山钢铁股份有限公司某热轧生产线三电自主集成改造项目中,通过对原有活套控制系统的套量计算模型、力矩模型、起套过程控制、稳态控制等进行优化,保证了新的活套控制一次投入成功,从开轧到正式投产无废钢,活套角度和张力控制精度均较老系统有了较大提高。     

用于多塔式立式活套的解耦控制技术

在大型高速连续退火机组中,多塔式立式活套中活套位置的平衡控制和活套内带钢的恒张力控制一直都是此类机组控制的重点和难点。本文提出一种用于多塔式立式活套位置平衡与恒张力控制的解耦技术,可有效抑制塔间位置平衡调节对活套内带钢张力的影响,实现与带钢张力控制完全解耦的活套位置平衡调节。通过在华东某冷轧厂1 450 mm连续退火机组工程的成功运用,证明该技术控制精度高、响应快、性能稳定,可在同类生产线上广泛应用。     

立式活套张力控制的截面积补偿和位置补偿

碳钢连退机组中,立式活套中的带钢保持稳定的张力行进,这对机组的连续平稳运行非常重要,而带钢横截面积的变化和活套钢丝绳的拉伸变形是影响活套张力稳定的两个重要因素。从原理上分析阐述带钢横截面积变化和活套钢丝绳拉伸变形对活套张力的影响,并在控制系统中添加相应的补偿环节来消除这些张力扰动。     

热连轧AGC-LP多变量系统解耦控制策略

 针对热轧带钢连轧过程中,张力干扰引起厚度控制精度降低的情况,在综合分析厚控系统与活套系统之间相互作用基础上,建立了多变量、强耦合厚度 活套非线性动态模型,提出将逆系统理论应用于该模型的解耦控制策略。在证明AGC LP系统可逆的条件下,建立了该模型的逆系统,将原非线性系统解耦成为AGC LP复合伪线性系统,采用线性控制理论设计解耦控制器,实现了AGC LP非线性系统解耦控制。仿真结果验证了所建模型的合理性和控制方案的可行性。     

高速连退机组的几个关键控制技术

与普通连退机组相比,高速连退机组具有速度快、活套塔多、退火炉区张力分段多、机组储存带钢长等诸多特点。详细介绍了高速连退机组清洗段张力、多塔活套张力及调平、退火炉区张力等几个关键控制技术的原理及方法,特别是针对退火炉区张力不易精确控制的现象,提出了提高张力控制精度的多种控制策略及补偿方案。生产实践表明,由本文所阐述的控制技术搭建的控制系统稳定、可靠,张力控制精度高。     

热镀锌机组活套张力控制研究与改进

攀钢集团攀枝花钢钒有限公司冷轧厂热镀锌机组在生产过程中,入口活套张力出现波动,严重影响机组的运行和产品质量。对活套张力控制策略进行了分析,通过为活套电动机增加活套钢带、活套车和配重的重力力矩补偿,以及利用速度-转矩曲线为张力辊增加了速度差力矩补偿后,机组活套张力波动减小,满足了生产线的工艺要求。     

连续退火机组入口立式活套的控制技术

以国内某钢铁公司冷轧厂连续退火生产线入口立式活套为例,阐述了立式活套卷扬的速度控制,活套的张力控制,活套位置的同步控制以及机械损耗、惯量损耗、重量补偿的计算方法.通过这些方法的应用,很大程度上改善了系统的控制精度和稳定度,保证了生产线的连续运行.     

连续热镀锌线入口活套张力控制

张力控制是镀锌板带质量控制的一个重要环节,是产品质量控制的关键问题。文章介绍了热镀锌生产线轧制过程中入口活套功能、控制要求、设备组成及张力控制,对影响入口活套张力不稳定因素进行了分析。通过分析各种形成张力不稳定的可能因素,进行补偿,减少系统张力手动调节步骤,尽可能实现全线运行过程中的恒张力控制。     

热连轧厚控精度分析及提高精度的途径

分析和实践表明，造成热连轧机厚控精度远低于连轧机的主要原因是活套控制系统与厚度控制系统的相互干扰，采取改进活套支持器结构，多变量最优控制和张力与厚度解耦控制等虽然取得了一定效果，但受连轧基本理论－秒流量相等条件的限制，并未取得突破性进步，特别是以流量测厚值为标准，直接影响了自适应的效果，连轧分布参数动态数学模型为解决厚度与张力的干扰提供了新思路，而数学模型与人工智能结合的协调推理网络为其具体实现方     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.