轧机锁紧缸泄漏原因分析及系统改进

介绍了韶钢忆厂水平七连轧机组机架框移、锁紧系统原理，分析锁紧油缸产生外泄和内泄漏的原因，提出液压系统的改进方案，为类似系统的设计和维护提供参考。     

轧机锁紧缸泄漏原因分析及系统改进

介绍韶钢四轧厂水平七连轧机组机架横移、锁紧系统原理 ,分析锁紧油缸产生外泄和内泄漏的原因 ,提出液压系统的改进方案 ,为类似系统的设计和维护提供参考 .     

液压压下液压系统参数的合理选择

一、板带轧机的工况分析 现代化板带轧机广泛采用液压压下新技术。液压系统的流量必须满足轧机工作的需要。 1.轧机稳定轧制状态 轧机在开始轧制时,要根据板带的入口厚度和出口厚度,给定原始辊缝。当来料厚度没有偏差,轧机稳定轧制时,压下油缸处于一定压力下保持辊缝不变。这时系统提供给压下油缸的流量很小,只是补充油缸的泄漏量,而皮囊蓄势器得到充液的机会。     

SP 轧机模块锁紧装置改进

1580的SP轧机模块锁紧装置采用液压控制形式,在轧钢状态时利用液压力对模块进行锁紧,该处工况复杂,距离钢坯较近,非常容易发生油缸漏油甚至火灾事故,对生产产生较大影响,经过对该锁紧装置分析,对结构进行改进,提出采用蝶形弹簧形式的锁紧缸,并进行相关分析、计算和设计。应用后可以有效的避免油缸漏油、火灾等事故的发生,保证生产的稳定运行。     

PC轧机稳定油缸压力选择与垂直减振效果分析

以PC轧机稳定油缸为研究对象,针对其压力选择及垂直减振效果进行分析,仿真不同压力下稳定油缸的作用效果,为轧制现场各阶段油缸压力的合理选择提供理论依据,有助于充分发挥稳定油缸的作用,减小轧机振动、提高轧制稳定性。     

减少液压压下油缸摩擦力的措施

板带轧机中的厚度自动控制油缸,是调节辊缝位置、控制轧制力大小、实现APC、PGC功能的执行机构。油缸要动作灵敏,定位准确,摩擦力小,才能较好地完成所承担的任务。当从油缸中取压力反馈信号时,如油缸的摩擦力为轧制力的2％,在2000t轧制力、轧机刚度为1/500mm/t的情况下,就会给辊缝位置带来2000×0.02×1/500=0.08mm的误差。可见摩擦力过大会降低油缸的灵敏度和精度,使板带成品的纵向误差加大;同时这种非线性的摩擦力还会引起压力反馈系统的低频振荡,而这种振荡又很难采用理想的校正环节来加以消除,因此降低了系统的动态品质。 1.油缸摩擦力的产生     

轧机液压AGC伺服缸试验台测试缸控制系统研究

轧机液压AGC系统已成为高精度快速轧制的核心设备。系统中的关键元件轧制伺服油缸轧制力大、行程短、频率响应高、测试难度大,常常因无法预测故障或不能判断故障部位而被迫停产检修。根据大型轧机实际使用情况,参考国家和行业的相关液压试验标准,以轧机液压AGC伺服油缸为试验对象,北京科技大学与唐山学院共同开发设计了一套全新的最大轧制力为9 200t的大型轧机液压AGC伺服油缸试验台设备,主要完成油缸的动态和静态性能测试。试验台液压系统由加载系统和测试系统两部分构成。测试系统由加载油缸、测试油缸、三级伺服阀、压力传感器、位置…     

关于轧机辊环装配紧固性的探讨

分析了高速线材轧机辊环装配的结构特点,研究了影响轧机辊环装配紧固性的主要因素,提出了辊环安装油缸加压压力的简单计算方法。     

可逆6辊冷轧机锁紧油缸活塞杆改造

武钢某厂可逆6辊冷轧机(简称RCM)在传动辊换辊过程中,经常出现传动轴轴头锁紧油缸不能正常工作的故障现象。通过研究分析,对锁紧油缸活塞杆进行设计改造,保护油缸不被损坏。     

液压压下油缸减少摩擦的途径

现代轧机广泛采用液压压下实现厚度自动控制,它是一个电液伺服系统,具有很快的动态响应(系统频宽约10～20Hz),因此它的执行机构——油缸,摩擦阻力系数必须很小(±0.5～1％),否则将影响系统的静态和动态品质。例如,不少液压压下装置由于空间限制,用油缸上的压力传感器作     

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.