Influence of different cord pitch on the pullout force of steel cord conveyor belt splice

The splice is the weakest part of the entire steel cord conveyor belt. And it occurs steel cord twitch fault frequently. If this fault cannot be dealt with timely and accurately, broken belt accidents would be occurred that affecting the safety of production seriously. In this paper, we investigated the different cord pitch pullout of the steel cord conveyor belt splice by using ABAQUS. The finite element model of the ST630 type steel cord conveyor belt was established, same as to the standard of the experimental sample. The pullout force of length 50.0, 70.0, 80.0 and 100.0 mm single steel cord impacted at steel cord conveyor belt splice was numerically computed respectively. The finite element model consists of rubber, steel cord and failure unit. Failure unit is used to simulate the bonding relationship between steel cord and rubber. Mooney-Rivlin hyper-elastic model for rubber was employed in the numerical simulations. Typical results obtained have been validated by experimental result and the relative error between simulation results and experimental results is within 10%. Simulations were also done for cord pitch of 4.0, 4.5, 6.0, 7.0 and 8.0 mm to study its effect on the pullout force of steel cord conveyor belt splice. The variation of cord pitch at normal impact was found to have influence as long as the cord pitch was different. It provides us the numeric value of the pullout force with the different cord pitch, and conducts us selecting the correct steel cord configuration spacing for the steel cord conveyor belt splice, as well for the steel cord conveyor belt. This is an efficient way for avoiding the steel cord twitch fault and the broken belt accident, while ensuring their high reliability and service life.     

子午线轮胎钢丝帘线受力的参数分析

采用试验和仿真结合的研究手段对影响全钢载重子午线轮胎钢丝帘线受力的参数进行系统分析。基于试验验证准确性后的模型,着重分析了帘线受力随典型参数变化的敏感性。研究结果表明,充气压力、垂直负荷、带束层宽度、帘线排列密度和铺设角度等参数对子午线轮胎帘线受力的敏感性明显强于带束层厚度和帘线模量。     

全钢载重子午线轮胎胎圈损坏引出的钢丝帘线抽出力探讨

研究钢丝帘线的直径、材质和结构对钢丝帘线抽出力的影响。试验结果表明,钢丝帘线的直径和强度增大、结构紧密,钢丝帘线的抽出力反而减小;在采用高强度、紧密型钢丝帘线提高轮胎性能时应关注抽出力降低的影响。     

钢丝帘布的剥离测试方法研究

针对钢丝帘布剥离测试结果的系统性不稳定情况,研究剥离力测试结果的影响因素。结果表明:利用夹持端包布提高夹持摩擦力不能改善剥离测试效果,反而导致试样水平端面硫化压力分布不均造成剥离力下降;帘布间敷贴带束胶片虽然能大幅提高剥离力,但从剥离后覆胶状态来看更多反映的是帘布间胶料的撕裂强度;剥离拉伸速率越大,胶料破坏方向越平直,剥离力有下降趋势;硫化时间太长导致的硫化返原可明显降低剥离力。     

炭黑硬度对胶料与钢丝帘线粘合力的影响

研究炭黑N326粒子硬度对轮胎带束层胶料物理性能以及胶料与钢丝帘线粘合力的影响.结果表明,随着炭黑N326粒子硬度的增大,带束层胶料门尼粘度、MH、ML、邵尔A型硬度、定伸应力和拉伸强度增大,拉断伸长率减小,焦烧时间和正硫化时间缩短;炭黑N326粒子硬度对硫化胶与钢丝帘线粘合力影响较大,两者呈正比关系.     

钢丝对废橡胶微波裂解过程的影响分析

研究钢丝对废橡胶微波裂解过程的影响并进行有限元仿真和试验探究。仿真结果表明,含钢丝的废橡胶在钢丝附近场强明显增强,热点增多且分布均匀。裂解试验结果表明,废橡胶中存在适量钢丝会促进废橡胶的裂解,使裂解升温更快,出油比例更高。由此认为,废轮胎整胎微波裂解更有利于提高裂解效率、促进节能环保和改善裂解产物品质。     

4+6HT Betru®系列钢丝帘线在全钢载重子午线轮胎带束层中的应用

研究4＋6HT Betru（系列钢丝帘线在全钢载重子午线轮胎带束层中的应用。结果表明,4＋6HT Betru（系列钢丝帘线是结构简单、强度高、直径小和全橡胶渗透的新型钢丝帘线,以4＋6×0.38HT Betru（或4＋6×0.30HT Betru（钢丝帘线替代3＋9＋15×0.22＋0.15钢丝帘线用于全钢载重子午线轮胎带束层,可获得适当的带束层刚度,轮胎耐磨性能和耐腐蚀性能提高,同时可降低生产成本。     

长距离钢绳芯胶带输送机设计计算

论述了长距离钢绳芯胶带输送机的小时输送能力、最大张力、带强、轴功率、动载最大张力及安全系数、电机过载、翻带区长度、四弧段半径等问题的计算或校验方法。该方法适用于各种长度、各种类型的钢绳芯胶带输送机，在晋宁磷矿的工程设计中也得到了证实。     

2+4×0.22HT Betru®钢丝帘线在轿车子午线轮胎带束层中的应用

研究2＋4×0.22HT Betru钢丝帘线在轿车子午线轮胎带束层中的应用。结果表明：与1×3×0.28HT钢丝帘线相比,2＋4×0.22HT Betru钢丝帘线的破断力明显提高,在相同安全倍数下压延钢丝帘线密度减小,渗胶性能较好,工艺过程稳定;以其替代1×3×0.28HT钢丝帘线用于轿车子午线轮胎带束层中,成品轮胎的各项性能均达到指标要求。     

Adhesion Between Rubber Compound and Copper-Film-Plated Steel Cord

Four copper-film-plated steel cords (abbreviated hereafter as copper-plated cord) with different thickness of copper film from 32 to 90 nm were prepared and their adhesion properties with rubber compound were investigated. Adhesion properties improved with the decrease in the thickness of the copper film. Unaged pull-out force and rubber coverage of copper-plated cords were inferior to those of brass-plated cord, but adhesion degradation was significantly slower on copper-plated cords resulting in better adhesion after humidity aging of 15 days and salt solution aging of 5 days. The excellent adhesion stability of copper-plated cords can be explained by the suppression of the excessive growth of copper sulfide and the inhibition of dezincification due to the small amount of copper plating and the lack of metallic zinc at the outer surface.     

275/70R22.5公交专用轮胎胎体钢丝帘线的微观界面剖析

对不同品牌的275/70R22.5公交专用轮胎使用后胎体钢丝帘线微观界面进行剖析。结果表明,0.20+6+12×0.175,3+9+15×0.175和3+9+15×0.175+0.15三种胎体钢丝帘线实际使用前后的破断力变化很小,H抽出力与新轮胎相比略小。A品牌选用0.20+6+12×0.175钢丝帘线,在胎侧屈挠区域胎体钢丝帘线内部完好无损,B和C品牌分别选用3+9+15×0.175和3+9+15×0.175+0.15钢丝帘线,胎侧屈挠区域钢丝帘线分别有明显的疲劳损伤现象。从B和C品牌轮胎的微观照片可以看出,钢丝帘线有明显疲劳磨损后产生的凹槽。     

3×0.24+9×0.225WHT钢丝帘线在无内胎全钢载重子午线轮胎胎体中的应用

以3×0.24+9×0.225WHT钢丝帘线替代3+9+15×0.175+0.15钢丝帘线应用于315/80R22.5 18PR无内胎全钢载重子午线轮胎胎体。试验结果表明:与3+9+15×0.175+0.15钢丝帘线相比,3×0.24+9×0.225WHT钢丝帘线强度高,直径小,且钢丝帘布压延密度大,上下覆胶厚度和钢丝间胶厚度大;以3×0.24+9×0.225WHT钢丝帘线替代3+9+15×0.175+0.15钢丝帘线后,成品轮胎的外缘尺寸变化不大,强度性能和耐久性能提高,且轮胎质量和成本减小。     

EFFECT OF CURE RATE OF RUBBER COMPOUND ON THE ADHESION TO COPPER-PLATED STEEL CORD

Copper-plated steel cord was prepared and its adhesion properties to rubber compounds, which have different loading amounts of both sulfur and accelerator, were examined in comparison with brass-plated steel cord. The lower pullout force of copper-plated steel cord to the rubber compounds was shown compared with brass-plated steel cord. The copper-plated steel cord showed higher adhesion retention to rubber compounds than brass-plated steel cord against various hostile environments. The stability against both humidity aging and thermal aging, and the cause for the high adhesion retention of the copper-plated steel cord to rubber compounds, were discussed compared with those of the brass-plated steel cord. The pullout force of copper-plated steel cord to rubber compound is inversely correlated with cure rate after various aging treatments.     

一款新型钢丝帘线在带束层中的应用

本文主要研究了一种超高强度钢帘线的应用,通过新型钢丝帘线2+2×0.32ST在带束层中的应用。测试将结果显示:带束层中应用2+2×0.32ST钢丝帘线(对比传统HT钢丝帘线相比),弯曲负荷、冲击力和疲劳强度更高,以之生产的成品轮胎耐久、高速等性能满足研发标准要求,滚动阻力降低,舒适性能提升,钢丝及胶料用量降低,节约成本,满足绿色、环保发展的需求。     

轮胎钢丝帘线技术发展

简述国内外轮胎的发展历史、钢丝帘线作为子午线轮胎骨架材料的独特性能优势及我国钢丝帘线行业的发展历程;结合有限元分析结果介绍子午线轮胎对胎体和带束层钢丝帘线的功能需求以及轮胎可持续发展的要求;重点阐释了钢丝帘线在强度、结构、预变形及镀层方面的主要发展趋势。     

Effect of cure rate of rubber compound on the adhesion to copper-plated steel cord

Copper-plated steel cord was prepared and its adhesion properties to rubber compounds, which have different loading amounts of both sulfur and accelerator, were examined in comparison with brass-plated steel cord. The lower pullout force of copper-plated steel cord to the rubber compounds was shown compared with brass-plated steel cord. The copper-plated steel cord showed higher adhesion retention to rubber compounds than brass-plated steel cord against various hostile environments. The stability against both humidity aging and thermal aging, and the cause for the high adhesion retention of the copper-plated steel cord to rubber compounds, were discussed compared with those of the brass-plated steel cord. The pullout force of copper-plated steel cord to rubber compound is inversely correlated with cure rate after various aging treatments.     

芳纶橡胶输送带的接头强度研究

针对芳纶橡胶输送带接头强度保持率低的问题,本研究以国内外芳纶橡胶输送带接头方案为基础,采用指型插接方案,系统性地探究了指型长径比、贴胶厚度、织物增强层结构等因素对接头强度的影响。实验证明接头强度随长径比的增大而升高;贴胶厚度在1mm时接头强度达到最大,此后接头强度随贴胶厚度的增加而降低;织物增强层沿经向放置的接头强度提高87%,接头强度保持率达到带体强度的60%。     

4+3×0.33ST钢丝帘线在全钢载重子午线轮胎带束层中的应用及压延工艺探讨

研究4+3×0.33ST钢丝帘线替代3×0.20+6×0.35HT钢丝帘线在全钢载重子午线轮胎带束层中的应用,重点探讨4+3×0.33ST钢丝帘线的压延工艺。结果表明:与3×0.20+6×0.35HT钢丝帘线相比,4+3×0.33ST钢丝帘线具有线密度低、渗胶性能好、覆胶弯曲刚度高等优点,可以实现等强度、等密度替代,在保证轮胎各项性能的同时,满足轮胎轻量化和降低制造成本的需求;由于4+3×0.33ST钢丝帘线为不规则结构,在压延时需要匹配合适的压力辊和整经辊槽径,避免压延时跳线的发生。     

国产钢丝绳芯输送带生产线升级改造

针对国产钢丝绳芯输送带生产线存在的钢丝绳初张力不稳定，钢丝绳磨损，钢丝绳恒张力误差大，成型车随机性左右摆动，带坯边胶切割劳动强度大、误差大，输送带断带方式笨重，生产线自动控制系统落后等问题，指出了切实可行的解决办法，使钢丝绳输送带质量产生了质的飞跃，同时改善了操作条件。使生产线的生产能力得到了有效发挥。     

2×0.28ST钢丝帘线在半钢子午线轮胎带束层中的应用

研究2×0.28ST钢丝帘线在半钢子午线轮胎带束层中的应用。结果表明,2×0.28ST钢丝帘线直径和线密度低于2×0.30HT钢丝帘线,但破断力相当,以2×0.28ST钢丝帘线替代2×0.30HT钢丝帘线用于半钢子午线轮胎带束层中,成品轮胎性能满足国家标准要求,同时可减小轮胎质量,降低生产成本。