输送带弹性模量影响多驱动功率分配的研究

多滚筒驱动能解决单滚筒驱动电机功率及输送带张力过大的问题,但多滚筒驱动存在驱动力分配即功率平衡的问题,其中输送带的弹性模量对功率平衡的影响尤为严重,针对该问题,基于Kelvin-Voigt黏弹性模型,建立顺槽带式输送机整机离散化模型,并采用AMESim软件仿真不同弹性模量输送带满载启动工况,得出各个滚筒的驱动力并进行功率计算、比较。研究表明,采用弹性模量较大的钢丝绳芯输送带能有效提高输送机满载启动后的稳定性,能够使功率得到合理分配。该研究结果可为多滚筒驱动输送机输送带的选型提供参考依据,同时对延长输送带的使用寿命具有重要意义。     

双滚筒驱动带式输送机牵引力分配研究

分析了双滚筒驱动带式输送机在传递按一定关系分配2个滚筒的牵引力时,输送带张力的变化情况,并从设计和使用的角度指出了每一种牵引力分配方案的优点和缺点;讨论了在实际运转中,由于所用电机特性差别、滚筒直径差别以及输送带弹性的影响,使电机实际负载功率发生变化的情况,为双滚筒驱动带式输送机的设计和使用提供必要的理论依据。     

超长运距带式输送机的电动机功率平衡研究

为了能够有效地保证超长运距带式输送机的电动机功率平衡,针对相关问题进行了深入地研究。分析了双滚筒驱动超长运距带式输送机牵引力的分配公式;讨论了影响超长运距输送机的电动机功率平衡的动态和静态因素;研究了超长运距带式输送机电动机的功率平衡模糊自适应PID控制策略。     

基于变频器的带式输送机功率平衡控制的应用

针对多电机同轴拖动时产生转差功率的技术问题,分析带式输送机多电机同轴拖动的机械性质,研究带式输送机变频调速控制方式,从而提出变频调速主/从功率平衡控制原理及控制方式,实现主机和从机的负载转矩平衡分配,确保了带式输送机驱动电机功率匹配平衡。该技术成功地应用在阳泉煤业(集团)有限责任公司二矿拉运带式输送机,实现了2台1 140 V、250 k W电机且滚筒直径不同的变频拖动。     

基于输送带弹性伸长率的带式输送机功率平衡研究

随着大型带式输送机在煤炭、化工等领域的广泛应用,其各滚筒之间总功率的合理分配已成为焦点问题,故在电动机功率不平衡度数学模型的基础上,重点研究输送带弹性伸长率对不同类型功率分配的影响规律。结果表明:尼龙芯输送带受弹性伸长率影响更大,故安全起见,工程应用中建议选用较适合的钢丝绳芯输送带。     

带式输送机电动机故障分析

<正>带式输送机的驱动装置由驱动单元和驱动滚筒组成,为输送机提供牵引动力。驱动单元由电动机、联轴器和减速器组成,电动机是核心部件,提供带式输送机运行所需的动力。带式输送机运行中电动机的故障通常表现为不能启动、过热和异常噪声3种类型。     

煤矿带式输送机多机驱动功率平衡控制系统研究

煤矿井下长距离、高带速、大运量、大功率带式输送机多机驱动时存在功率不平衡等,造成电动机过载甚至损坏等问题。通过对带式输送机滚筒牵引力的理想和实际配比的分析,按转矩进行负荷分配,采用主机为速度闭环的矢量控制,从机为主机速度级联下的转矩控制,主、从电动机在转矩分配给定的情况下进行转矩闭环控制。重点分析转矩闭环的功率平衡控制原理,并进行仿真,仿真结果表明,带式输送机的主从电动机在正常运行和突加负载的情况下,转矩均能实现按比例分配,可实现功率平衡,证明了控制系统设计的正确性。     

对带式输送机计算的一点意见

带式输送机是靠传动滚筒与输送带间的表面摩擦力进行传动的.在计算输送带各点张力和电动机功率时,是利用尤拉公式求解的,以简单的单滚筒传动为例(图1),存在着S_4=S_1e~(μα)的关系,但是α定为输送带在传动滚筒上的全部围包角,是不正确的.因为在带式输送机正常工作时,包在滚筒上的一部分输送带不可避兔地要产生弹性滑动,这是由于滚筒两边的输送带张力不等而使输送带的弹性变形不等引起的.在传动滚筒处,     

胶带机双滚筒驱动实际牵引力分配的分析

胶带机双滚筒驱动实际牵引力分配的分析山西矿业学院周法孔太原矿山机器厂周继祥目前大型矿山斜井提升通常采用ＧＸ型带式输送机，多为双滚筒多电动机驱动，电动机按牵引力匹配，有２比１和１比１两种。实际上这种理想的匹配很难实现，时有因负荷分配不均使电动机欠载、超...     

基于RecurDyn的双驱动带式输送机起动特性研究

以长距离水平运载的带式输送机为研究对象,针对头部双滚筒驱动及头尾双滚筒驱动2种驱动方式,建立了基于RecurDyn的多体动力学模型,研究了不同双驱动位置对带式输送机起动阶段输送带张力的影响,结果表明,头尾双滚筒驱动在起动阶段对输送带张力的影响要小于头部双滚筒驱动。该研究为带式输送机双滚筒驱动的设计以及输送带的选取提供了参考和依据。     

Current situation and future trend of China rare earth luminescent materialindustry(continued)

<正>Developing ecological lighting source The world is facing the big problem of energy shortage today and the contradiction between economy development and environmental protection is worsened.Therefore,people are more likely to choose an ecological light source that is more energy efficient and environmental friendly.The choice provides great opportunity for the development of rare earth optical material industry in China.The concept of green lighting positions rare earth luminescent material as a leading player in illumination market.The light source of both rare earth luminescent lamp and LED lamp is ecological and energy saving.This is why     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.     

Rare Earth Application in Steel in China

<正>China has rich rare earth resources.Output of rare earth and steel in China ranks the top first in the world.However,there is still certain distance between the steel produced in China and developed countries from the point of varieties and quality.China still has to import some types of steel.Improving the quality should be emphasiZed in future development of steel industry in China.Rare earth can be used to upgrade traditional steel     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

稀散金属产业的观察与思考

分析了近年来国内外稀散金属产业的生产、应用、资源与市场状况.铟锡氧化物靶材、砷化镓晶片、锗红外材料、铼高温合金和硒在电解锰及玻璃的应用等已成为稀散金属的主要应用领域.稀散金属的产量快速增长达到历史高位而导致了市场的失衡.以GaInP_2/GaAs/Ge,CIGS和CdTe为代表的非硅系太阳能电池是稀散金属的新兴应用领域,将给稀散金属带来日益增长的需求.     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared