步进式冷床的结构分析及其现场维护     

李军  代鑫 《辽宁科技学院学报》2012,14(2):8-9

介绍了特钢厂800轧线大棒步进式冷床的结构形式及工作原理。总结了该装置使用以来由于设备安装缺陷而产生的故障,并对部分改进方案的实施性、可靠性进了的分析,并采取了相应的改进措施。  相似文献   

Performance differences when using 26- and 29-inch-wheel bikes in Swiss National Team cross-country mountain bikers     

Thomas Steiner  Beat Müller  Thomas Maier  Jon Peter Wehrlin 《Journal of sports sciences》2016,34(15):1438-1444

The purpose of this study was to analyse the effect of bike type – the 26-inch-wheel bike (26“ bike) and the 29-inch-wheel bike (29“ bike) – on performance in elite mountain bikers. Ten Swiss National Team athletes (seven males, three females) completed six trials with individual start on a simulated cross-country course with 35 min of active recovery between trials (three trials on a 26“ bike and three trials on a 29“ bike, alternate order, randomised start-bike). The course consisted of two separate sections expected to favour either the 29“ bike (section A) or the 26“ bike (section B). For each trial performance, power output, cadence and heart rate were recorded and athletes’ experiences were documented. Mean overall performance (time: 304 ± 27 s vs. 311 ± 29 s; P < 0.01) and performance in sections A (P < 0.001) and B (P < 0.05) were better when using the 29“ bike. No significant differences were observed for power output, cadence or heart rate. Athletes rated the 29“ bike as better for performance in general, passing obstacles and traction. The 29“ bike supports superior performance for elite mountain bikers, even on sections supposed to favour the 26“ bike.  相似文献   

车辆轮轴称重仪的误差分析     

郑惠群 《宁波职业技术学院学报》2005,9(5):10-12

轮轴称重仪是测量车辆各轮、轴重及车辆总重的称重仪器,影响轮轴称重仪称重误差的因素很多,本文将车辆本身结构对轮轴称重仪的误差影响及其他因素的误差影响进行全面分析.  相似文献   

人造金刚石提纯废水处理沉淀池的设计     

黄世谋  苑玉洁 《三门峡职业技术学院学报》2003,2(3):71-73

本文对人造金刚石提纯废水进行了研究,在试验和分析的基础上,根据生产实际设计出科学实用的竖流式沉淀池,可对悬浮固体的有用成分进行回收,能取得一定的经济效益。  相似文献   

4×4载货汽车的设计要点技术分析     

鲍晓东 《北京工业职业技术学院学报》2007,6(4):11-16

以一吨4×4载货汽车的设计为例，对特殊性能进行专门系统的理论分析，寻求比较合适的4×4载货汽车的设计要点。通过计算分析，得出在轴距的选择、轮距的确定、动力总成及各大总成的布置、横向稳定杆的选择、汽车的摆振控制等方面应重点考虑，才能使4×4载货汽车设计趋于合理。  相似文献   

Phase Transformations of Graphite and Carbon Black by Laser with Low Power Density     

孙景翟琪  雷贻文杨星 杜希文 《天津大学学报(英文版)》2007,13(5):318-321

The structure phase transformations of graphite and carbon black induced by pulsed laser were studied in this paper.Under irradiation with laser beam of 1.06 μm wavelength and power density of 106 W·cm-2,both graphite structure and carbon black structure were changed obviously.The results of Raman analyses and Transmission Electron Microscopy(TEM)observations show that graphite transforms into nanodiamond about 5 nm and carbon black is graphitized.It is demonstrated that graphite is the intermediate phase in the transformation from carbon black to diamond,and graphite is easier to transform into diamond by laser irradiation than carbon black.  相似文献   

高炉不停风更换转炮减速机蜗轮的方法     

孙景云 《辽宁科技学院学报》2007,9(1):29-30

文章概述了高炉电动泥炮的主要机构及其转炮的工作情况,分析了高炉不停风更换转炮减速机蜗轮的原因,并提出更换转炮减速机蜗轮的方法.  相似文献   

Scratching and Turning Experiments on Machinability of Optical Glass SF6 in Diamond Cutting Process     

贾鹏  周明 《天津大学学报(英文版)》2011,17(4):280-283

To improve the machinability of optical glass and achieve optical parts with satisfied surface quality and dimensional accuracy, scratching experiments with increasing cutting depth were conducted on glass SF6 to evaluate the influence of cutting fluid properties on the machinability of glass. The sodium carbonate solution of 10.5% concentration was chosen as cutting fluid. Then the critical depths in scratching experiments with and without cutting fluid were examined. Based on this, turning experiments were carried out, and the surface quality of SF6 was assessed. Compared with the process of dry cutting, the main indexes of surface roughness decrease by over 70% totally. Experimental results indicated that the machinability of glass SF6 can be improved by using the sodium carbonate solution as cutting fluid.  相似文献   

540MPa级高强度滚型车轮用钢的研制与应用     

赵江涛  刘永前  刘斌  周祖安  杨海林 《武汉工程职业技术学院学报》2011,(3):8-11

通过在碳锰钢的基础上添加Nb微合金化元素,成功开发出珠光体占10%的铁素体＋珠光体组织的高强度车轮用钢,该钢钢质纯净、晶粒细小、强度高、成形性能优良,已成功应用于轿车轮辋制造。  相似文献   

石壕矿选煤厂降低介耗的措施     

杜力  姚军民 《河北能源职业技术学院学报》2011,11(3):80-81

石壕矿选煤厂为矿区型炼焦煤选煤厂,有一套重介质选煤系统,采用重介旋流器选煤。介耗指标是选煤厂设计及使用时考虑的一个主要因素。石壕矿选煤厂采用弧形筛与振动脱介筛配合使用的脱介系统。通过对脱介弧形筛与振动脱介筛的精细化管理,取得了降低介耗、节约成本的经济效益。  相似文献