国六排放标准对润滑油行业的影响

研究国六标准实施后对润滑油行业的影响。主要通过概括国六标准排放限值的变化等内容和符合国六要求的汽油机和柴油机技术路线,分析国六发动机的新技术或设备对发动机润滑油的技术要求,讨论满足国六发动机的润滑油规格。国六标准实施将大力助推润滑油行业产品结构升级。     

Numerical investigation of a double-junction a:SiGe thin-film solar cell including the multi-trench region

We present a new approach based on the multi-trench technique to improve the electrical performances, which are the fill factor and the electrical efficiency. The key idea behind this approach is to introduce a new multi-trench region in the intrinsic layer, in order to modulate the total resistance of the solar cell. Based on 2-D numerical investigation and optimization of amorphous SiGe double-junction (a-Si:H/a-SiGe:H) thin film solar cells, in the present paper numerical models of electrical and optical parameters are developed to explain the impact of the multi-trench technique on the improvement of the double-junction solar cell electrical behavior for high performance photovoltaic applications. In this context, electrical characteristics of the proposed design are analyzed and compared with conventional amorphous silicon double-junction thin-film solar cells.     

N掺杂TiO_2/Ti液膜光催化处理染料废水

以尿素为氮源,采用溶胶-凝胶法制备了N掺杂Ti O2膜电极(N-Ti O2/Ti),并优化了制备条件。结果表明,n(N)∶n(Ti)=0.84∶1、经450℃煅烧2.5 h制得的膜电极光催化性能最佳;与Cu电极组装斜置双极液膜反应器,可见光下考察光催化反应的影响因素。得出最佳降解条件为:初始p H=2.50,废水流量为85 m L/min,Na2SO4质量浓度为0.5 g/L,此条件下处理20 mg/L苋菜红120 min,脱色率可达90.1%;膜电极的重现性与重复性结果表明,6片电极60 min的脱色率为78.1%±4.0%;一片电极经6次循环60 min脱色率比初次减少了7.9%。     

推土机变速箱用润滑油黏温特性研究

润滑油黏度的在线监测是实现设备状态监测与故障诊断的重要途径,但在实际工程应用中,润滑油的实时黏度需要根据润滑油的黏温特性换算成国家标准100℃时的黏度。为研究推土机变速箱润滑油15W40 CF-4的黏温特性,对SD22型推土机变速箱润滑油进行跟踪取样,测定新油、寿命中期油和废油在40~100℃时的运动黏度。采用Andrade方程、Walther方程和Vogel方程对试验所得的数据进行回归拟合,分析和比较3种黏温方程的拟合精度。结果表明,用Vogel方程来描述这类润滑油的黏温特性更加准确,为在线监测的实时黏度换算提供依据。     

MG200-BW采煤机牵截部壳体改进

浅析MG200-BW采煤机牵截部壳体存在的问题,牵截部在井下实际运转过程中,由于壳体过长,煤层倾角大,甲、乙两油池未隔开,在运转过程中各机械部件容易缺油造成重大机械事故。     

6LS系列采煤机的润滑

介绍了6LS采煤机所用润滑剂、润滑方式以及润滑状态的监测,说明严格遵守润滑规程,注意观察润滑油状态,按期检查油质,这些都是保证采煤机具有良好的工作状态,延长使用寿命和减少停机时间的重要因数之一     

Research on Effects of Groove Shape Optimization on Cavitation and Lubricating Characteristics for Microgroove Rotary Seal

This article studies the effects of groove shape optimization on cavitation and lubricating characteristics of microgroove rotary seals (MGRS). A lubrication model considering cavitation effects for MGRS is established to obtain the variation in cavitation and lubricating characteristics with operating conditions. Furthermore, an optimization model of groove shape based on the lubrication cavitation model is developed and an optimal groove is obtained by co-designing the parameters of both groove shape structures and molded lines. The effects of optimal grooves and ordinary spiral grooves on cavitation and lubricating characteristics are compared and validation tests are carried out. Theoretical and experimental results indicate that the lubrication cavitation model based on the mass conservation boundary condition for MGRS could accurately predict the cavitation region of ordinary spiral grooves. Optimal grooves improve the pressure distribution of the groove area and restrain the generation of a cavitation region; therefore, the fluid bearing capacity and dynamic stiffness of optimal grooves are much larger than those of ordinary spiral grooves.     

矿用林肯润滑泵的故障统计分析及测试台设计

统计矿用采、运、排等设备上的各型号林肯泵的故障损坏情况,对其故障类型进行归类后,分析故障原因。从不同检修方案进行故障检修的角度,对比检修成本。分析林肯泵打压测试工装的功能,并制定打压测试工装的方案,设计并制造了一种林肯泵检修修复后的打压测试工装。通过对林肯泵打压测试工装使用效果分析,表明该打压测试工装在故障林肯泵实际检修修复过程中,具有提高检修质量、降低返修率的作用。     

润滑油含水量对轴承性能影响的试验研究

为研究润滑油含水量超标时轴承的运行性能,搭建了滑动轴承试验台,通过试验研究了在不同含水量的润滑油对滑动轴承温度、摩擦力矩及轴心运动轨迹的影响。试验发现,润滑油含水量较低(质量分数0. 5%以下)时对滑动轴承的温度、摩擦力矩和轴心轨迹影响不大,但含水量达到一定程度时(如超过质量分数0. 5%)会使轴心轨迹重复性变差,导致转子运转有不稳定的趋势出现。这表明润滑油含水会对滑动轴承运行性能造成一定的影响,更为准确的结果还需长期的实验验证。     

给水泵跳车事故分析

文章讨论了锅炉给水泵运行中出现的突然跳车事故,依据DCS控制系统提供的信息,参照现场柜PLC控制程序,详细分析了事故经过,及润滑油泵站引起给水泵跳车的因果关系。并提出促进电气控制完善的一些措施,对于机泵类设备具有故障的典型性参考价值。