305/70R22.5全钢载重子午线轮胎的轻量化设计

介绍305/70R22.5全钢载重子午线轮胎的轻量化设计。结构设计:外直径996 mm,断面宽303 mm,行驶面宽度260 mm,行驶面弧度高11.2 mm,胎圈着合直径570.5 mm,胎圈着合宽度241.3 mm,断面水平轴位置(H_(1)/H_(2))0.795,采用高饱和度公路花纹,花纹深度19 mm,花纹饱和度75%,花纹周节数52。施工设计:采用翼型胎面结构,胎体采用3+9+15×0.175+0.15钢丝帘线,采用3层带束层+0°冠带条,1^(#)和2^(#)带束层采用3+9+15×0.22+0.15钢丝帘线,3^(#)带束层采用5×0.30HI钢丝帘线,采用一次法三鼓成型机成型、蒸锅式硫化工艺硫化。成品轮胎性能试验结果表明,轮胎的充气外缘尺寸、强度性能和耐久性能均满足国家标准要求。

不同胎体钢丝帘线对轮胎下沉量的影响

以445/45R19.5轮胎为研究对象,通过有限元分析研究3+9×0.22W,0.25+6+12×0.225HT和0.22+6+11×0.2053种胎体钢丝帘线对轮胎下沉量的影响。结果表明:胎体分别采用这3种钢丝帘线,帘线密度为50,55,60,70,80根·dm^(-1)时,轮胎下沉量变化区间集中在0%~0.50%,即胎体钢丝帘线密度和类型与轮胎下沉量呈弱相关关系。因此在优化材料参数改善轮胎性能时,可以忽略胎体钢丝帘线密度和类型对轮胎下沉量的交互影响。

全钢载重子午线轮胎花纹沟底裂口的原因分析及解决措施

根据对全钢载重子午线轮胎纵向花纹的应力分析,采取改善轮胎轮廓设计、优化材料分布、改善花纹沟形状、合理设计花纹沟底圆弧等方法,可改善轮胎接地压力分布和花纹受力,减小胎面胶变形,提高轮胎的耐疲劳性能,进而改善花纹沟底裂口现象。

Power demand and mixing performance of coaxial mixers in a stirred tank with CMC solution

Experimental investigation was carried out in an elliptical based stirred tank with a diameter of 0.48 m to explore the power demand and mixing performance of coaxial mixers.Syrup and CMC solution(sodium carboxy methyl cellulose)were used as the Newtonian and non-Newtonian fluids,respectively.Four different coaxial mixers were combined with either CBY or Pfaudler impeller as the inner one,and anchor or helical ribbon(HR)as the outer one.Results show that Pfaudler-HR is the optimized combination among four coaxial mixers in this work,which provides the shortest mixing time given the same power consumption.Compared with the syrup solution,the increase of power input can make the mixing time decreasing more obviously in the CMC solution.The quantitative correlations for both syrup and CMC solutions were established to calculate the power draw and the mixing time of four coaxial mixers.

全钢载重子午线轮胎两鼓成型机上胎侧耐磨胶打褶的原因分析及解决措施

分析采用两鼓成型机胶囊成型鼓生产的全钢载重子午线轮胎在成型过程中产生胎侧耐磨胶打褶的原因,并提出相应解决措施。通过采取使用表面深度为0. 5 mm的网格状胶囊、根据轮胎规格调整成型鼓反包胶囊扣胎圈后的预充气压力、确保成型鼓反包胶囊与助推胶囊充气后胎圈外侧的帘布端点和钢丝包布端点直立以及反包臂摆入后反包轮的落点与成型鼓扇形块膨胀撑起后表面的距离控制在2~5 mm等措施,有效解决了全钢载重子午线轮胎两鼓成型机上胎侧耐磨胶打褶问题。