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从轮胎结构入手,采用单一变量控制法,研究三角胶高度、三角胶硬度、胎体帘布层数、胎体帘布反包高度及冠带条缠绕方式对285/35ZR22 106XL/W低扁平比轿车子午线轮胎耐久性能的影响。结果表明:在一定范围内,三角胶高度和三角胶硬度越小,轮胎低气压耐久性能越好;与胎体采用单层2200dtex/3聚酯帘布的轮胎相比,胎体采用双层1100dtex/2聚酯帘布的轮胎低气压耐久性能更优;与胎体帘布反包至三角胶上方10 mm的轮胎相比,胎体帘布反包至带束层底部的轮胎低气压耐久性能更优;与1.5层冠带条缠绕轮胎相比,2层冠带条缠绕的轮胎低气压耐久性能更优。 相似文献
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以3+9+15×0.225HT钢丝帘线替代3+9+15×0.22+1NT钢丝帘线用于12.00R20 18PR全钢载重子午线轮胎胎体和带束层。结果表明,以3+9+15×0.225HT钢丝帘线替代3+9+15×0.22+1NT钢丝帘线用于12.00R20 18PR全钢载重子午线轮胎胎体和带束层,成品轮胎的外缘尺寸基本不变,轮胎强度性能、耐久性能和速度性能以及胎圈耐久性能均有较大提高,在不增加胎体和带束层质量和成本的情况下,胎体和带束层安全倍数大幅提高,从而提高了轮胎的使用安全性能和负荷能力。 相似文献
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介绍轮胎高速/耐久性能试验的测试原理和方法,分析轻型载重轮胎常见失效模式及不同部位的受力,提出提升轮胎高速/耐久性能的措施。高速性能和耐久性能试验中轮胎失效模式较为相似,但高速性能试验轮胎失效部位较多体现在胎肩,而耐久性能试验轮胎失效部位较多体现在胎圈。合理的外轮廓与材料分布有利于轻型载重轮胎保持较好的高速/耐久性能,胎面/胎侧薄层化以及帘布层覆胶厚度增大等可有效提升轮胎高速性能;采取2层胎体帘布反包、使用低硬度三角胶、贴增粘补强胶片以及使用覆胶厚度大的胎体帘布等措施均有利于提高轮胎耐久性能。 相似文献
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子午线轮胎是由橡胶弹性体和纤维一橡胶复合材料组成,其结构十分复杂,如图1所示。在轮胎使用过程中,常会出现带束层间或胎体反包端点处层间界面裂纹扩展,严重影响轮胎的耐久性能和使用寿命。轮胎耐久性试验(试验后样品见图2)和轮胎实际工况的破坏分析表明,轮胎带束层间和胎体反包端点处层间界面裂纹扩展是轮胎早期破坏的主要原因,轮胎早期疲劳破坏对轮胎的耐久性能和使用寿命影响很大,直接影响车辆行驶的安全性和经济性。 相似文献
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研究粘合剂HMMM-55母胶粒(六甲氧基甲基蜜胺质量分数为0.55)在工程机械轮胎胎体帘布胶中的应用。结果表明:添加粘合剂HMMM-55母胶粒的胎体帘布胶硫化速度加快,物理性能和粘合性能提高,生热降低;粘合剂HMMM-55母胶粒用量为3.6份的胎体帘布胶综合性能较好,成品轮胎胎体帘布脱层问题解决,耐久性能提高。 相似文献
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乙烯酮(双乙烯酮)是十分重要的化工中间体,其下游产品较多。江苏某化工厂开发生产乙烯酮(双乙烯酮)下游产品三十多个,年生产规模三万多吨,是国内以乙烯酮(双乙烯酮)为中间体生产精细化学品的综合骨干企业。针对乙烯酮(双乙烯酮)下游产品废水特点,该厂结合企业实际,开展了产品优化,结构调整,清洁生产,资源循环利用,节水降耗等工作,从源头削减了污染物的生产。同时投资二千多万元新建预处理装置三套,6000m3/d废水生化处理装置一套,使全厂乙烯酮(双乙烯酮)下游产品的废水得到了有效的治理。 相似文献
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我厂3号回转窑(Φ4m×60m)生产线在1996年年底由SP窑(产量912t/d)改为NSP窑(产量1320t/d),预分解系统为四级旋风预热器带离线式分解炉 相似文献
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The objective of the study was to explore the effect of the degree of deacetylation (DD) of the chitosan used on the degradation rate and rate constant during ultrasonic degradation. Chitin was extracted from red shrimp process waste. Four different DD chitosans were prepared from chitin by alkali deacetylation. Those chitosans were degraded by ultrasonic radiation to different molecular weights. Changes of the molecular weight were determined by light scattering, and data of molecular weight changes were used to calculate the degradation rate and rate constant. The results were as follows: The molecular weight of chitosans decreased with an increasing ultrasonication time. The curves of the molecular weight versus the ultrasonication time were broken at 1‐h treatment. The degradation rate and rate constant of sonolysis decreased with an increasing ultrasonication time. This may be because the chances of being attacked by the cavitation energy increased with an increasing molecular weight species and may be because smaller molecular weight species have shorter relaxation times and, thus, can alleviate the sonication stress easier. However, the degradation rate and rate constant of sonolysis increased with an increasing DD of the chitosan used. This may be because the flexibilitier molecules of higher DD chitosans are more susceptible to the shear force of elongation flow generated by the cavitation field or due to the bond energy difference of acetamido and β‐1,4‐glucoside linkage or hydrogen bonds. Breakage of the β‐1,4‐glucoside linkage will result in lower molecular weight and an increasing reaction rate and rate constant. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 3526–3531, 2003 相似文献
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Conclusions It is significant that the purification on a single passage of viscose through porous ceramic corresponds to the result of a two-stage filtration of it in industrial filter-presses with standard fillings.Kiev Combine. Kiev Technological Institute of Light Industry. Translated from Khimicheskie Volokna, No. 3, pp. 20–22, May–June, 1969. 相似文献
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利用组件技术开发化工原理实验课件,给出了系统层、组件库层和应用层的架构划分。重点讨论了组件库的设计,给出了流体阻力这一典型实验的实现描述。实践证实,基于组件技术可以提高仿真实验的开发效率。 相似文献