密炼机二棱同步转子的三维温度场分析

建立密炼机二棱同步转子的物理和数学模型,并对其工作时的三维温度场进行有限元分析.结果表明,二棱同步转子在炼胶过程中,转子凸棱和密炼室壁间产生的热量最多,转子冷却和散热效果对排胶温度影响很大,转子强制冷却的效果非常明显.     

密炼机混炼橡胶的三维流场瞬态模拟

采用密炼室真实几何形状,假设胶料全部充满,建立密炼机内非等温、非牛顿橡胶流体的三维有限元模型,数值模拟分析胶料的压力、速度、温度和剪切速率等流场参数分布。分析结果表明,转子棱顶间隙处存在着一个很大的压力梯度,楔入区胶料流向密炼室轴向中间位置,而背压区和棱顶处胶料流向相反,除了密炼室内壁附近胶料温度较高外,两个转子之间区域的胶料温度也较高。     

Haake密炼机三维流场的非等温数值模拟研究

本文利用流体力学计算软件FLUENT对69cm3哈克密炼机内的聚合物熔体进行了三维非等温非稳态数值模拟,得到了三维流场的瞬时温度分布,并对熔体与密炼室之间的热量传递过程进行了分析。当粘性耗散生热量等于向外传热量时,达到热平衡状态,熔体平均温度不再变化。由于聚合物熔体具有较高的粘性生热,仅靠自然对流不足以使密炼室壁保持初始的设定温度,壁温会有所增加。流场的混合指数分布说明混合流场中剪切流动占主导地位,还包括一小部分拉伸流动和收敛流动。     

哈克密炼机三维流场的非等温数值模拟研究

利用流体力学计算软件Fluent对69 cm~3哈克密炼机内的聚合物熔体进行了三维非等温非稳态数值模拟,得到三维流场的瞬时温度分布,并对熔体与密炼室之间的热量传递过程进行了分析。结果表明:当粘性耗散生热量等于向外传热量时,达到热平衡状态,熔体平均温度不再变化。由于聚合物熔体具有较高的粘性生热,仅靠自然对流不足以使密炼室壁保持初始的设定温度,壁温会有所增加。流场的混合指数分布说明混合流场中剪切流动占主导地位,还包括一小部分拉伸流动和收敛流动。     

二维平面内密炼机温度场分析

利用有限元法对混炼过程中密炼室，胶料的温度分布以及变化情况进行了分析。分析结果对于研究如何避免温升过高、优化混炼条件、改进转子和密炼室的结构和提高混炼胶的质量，以及根据配方不同，探讨时间都有着重要的指导意义。     

密炼室的强度分析

本文介绍了利用有限元法对密炼室进行强度分析和模型简化、载荷计算及强度分析的具体方法，使密炼室的强度分析成为可行。     

密炼室的强度分析

本文介绍了利用有限元法对密炼室进行强度分析和模糊型简化，载荷计算臁强度分析的具体方法，使密炼室的强度分析成为可行。     

海外橡胶期刊摘要精选

<正>《橡胶化学与工艺》2016,Vol.89,No.3Rubber ChemistryTechnology速比对密炼室中高黏性混炼胶数字模拟的影响为了评价不同速比对混炼胶的影响,对密炼室中用双反向旋转转子混炼的胶料进行了三维、不稳定、等温及不可压缩计算流体动力学(FD)模拟。所研究的3个速比为1.0、1.125和1.5。除了不可压缩连     

加工工艺对聚乙烯/乙炔炭黑复合材料中炭黑分散性的影响

采用表面电阻的统计分析、力学性能测试及扫描电镜分析等手段研究了不同工艺方法和工艺条件对聚乙烯/乙炔炭黑复合材料中炭黑分散性的影响。结果表明:与开炼工艺相比,通过密炼工艺制得的试样中炭黑的分散性更好;采用密炼工艺,转速为30 r/min,密炼5 min后出料,裁成小块投入混炼室再密炼5 min,制得的试样中炭黑的分散性最好;高转速、长时间的密炼工艺对炭黑聚集体结构有一定程度的破坏。     

鹤壁环燕公司密炼机技改提质降本

鹤壁环燕轮胎有限责任公司自行设计制造的密炼机密炼室技改成功 ,投入使用一个月来 ,运行稳定 ,既保证了炼胶工艺质量 ,又节约了资金。该公司目前使用的 4台 75L密炼机都是在1 997年新厂投产时购进 ,由于运行时间已达 7年之久 ,机体出现了不同程度的磨损 ,特别是密炼室变形严重 ,筋板、加热套及内壁开裂 ,密炼室壁变薄 ,炼胶时出现漏水现象 ,造成炼胶质量不稳定。经咨询 ,更换一个密炼室需要 4 5万元 ,4台密炼机则需要 1 8万元。为了节约资金 ,该公司自行设计制造了抱筋板块 ,经过焊接、回火处理、烫磨、打孔、组装等工序 ,自制了一个密炼…     

PE-LLD/SBS共混过程中浓度分布的数值模拟及实验研究

使用POLYFLOW软件对HAAKE混合器中PE-LLD/SBS体系共混过程进行了三维等温数值模拟。通过对混合器位置、转子转速、分散相比例和温度等因素的分析,研究了PE-LLD/SBS熔体在HAAKE混合器中SBS相浓度随时间的分布的规律。并通过实验对模拟结果进行验证,结果表明数值模拟与实验结果有较好的吻合。     

影响密炼机炼胶温度因素的探讨

炼胶温度是决定密炼机生产能力和炼胶质量的重要因素之一。本文主要对影响密炼机的炼胶温度的因素进行了分析，并通过试验机台对转子转速，冷却水温度等因素对炼胶温度的影响进行了实验研究和分析。     

Hydrodynamic analysis of a banbury mixer 2-D flow simulations for the entire mixing chamber

Banbury mixers are widely used in polymer processing. The mechanics of flow in the chamber of an internal mixer are complex and difficult to analyze due to the complicated geometry and the highly transient character of the flow. For this work, a fluid dynamics analysis package—FIDAP, using the finite element method, was implemented to simulate the flow patterns for a Banbury B mixer. A 2-D flow analysis was carried out for the whole mixing chamber with two counter-rotating rotors. A power-law model fluid was used to characterize the rheological behavior of the mixture. 18 different geometries were selected to represent the relative position of the two rotors during their revolution. Streamlines and pressure contours were plotted for each geometry. Transient pressure profiles at fixed locations in the chamber wall were compared with experimental data. The comparison shows good agreement between theoretical predictions and experimental observations.     

不同转子构型的部分充满密炼机胶料流场数值模拟

使用软件Fluent对Banbury和Roller转子部分充满状态下的密炼机胶料流场进行二维等温数值模拟.研究结果表明:Roller密炼机流场更加频繁地经历最大剪切应力,两转子间的交换更加剧烈,胶料流动更复杂;Banbury 密炼机流场的平均混合指数略大于Roller密炼机,但所需要的扭矩输入较大.     

沥青发泡腔结构参数对腔内流场的影响

基于沥青发泡的原理和行为特点,采用单因素分析法用CFD软件模拟了腔体内沥青发泡的过程,分析了腔体容积、沥青入口尺寸、泡沫沥青出口尺寸对腔体内部温度场、压力场和速度场的影响规律,并运用灰色系统理论探寻主要结构参数与腔内流场间的数值关系. 结果表明,腔体容积为2V、沥青入口为0.71Q、泡沫沥青出口为0.75D(V, Q, D分别为三者的基准尺寸),可获得适宜的沥青发泡腔体内部流场;腔体容积、沥青入口尺寸、泡沫沥青出口尺寸与腔内压力场的关联度分别为0.56, 0.64, 0.53,与腔内速度场的关联度分别0.68, 0.71, 0.72,与腔内温度场的关联度分别为0.75, 0.71, 0.70,沥青入口尺寸是影响腔内压力场和温度场的主导因素,泡沫沥青出口尺寸是影响腔内速度场的主导因素.     

A comparison of the effects of traditional and wet mixing processes of rubber on metal friction and wear

Prolonged operations of mixers cause wear of mixer rotors and chamber walls and affect the clearances between the rotors and chamber walls, which reduce the mixing effect, weaken the dispersion of the packing, and affect the quality of rubber products. In this study, the effects of traditional mixing and wet mixing on the friction and wear of the chamber, and the properties of rubber were compared by using 60 phr of a silica natural rubber formulation system. The results show that a silanization reaction occurs between silica and the silane coupling agent during the mixing process and that the reaction rate is fastest when the temperature of the mixing chamber is maintained between 145 and 155°C for 1 min during the mixing process. The products of silanization reaction are ethanol and water; the water vapor that forms at high temperatures corrodes the mixing chamber of the internal mixer and aggravates wear and tear. Due to the high dispersion of silica during wet mixing, the silanization reaction is more complete and water vapor is produced at a high temperature. Hence, the rubber compound obtained by wet mixing has more significant wear on the mixing chamber.     

Internal mixing: A practical investigation of the influence of intermeshing rotor configuration and operating variables on mixing characteristics and flow dynamics

This paper deals with the measurement and interpretation of pressures and temperatures produced by the mixing of a rubber compound in the chamber of an internal mixer equipped with interlocking rotors. Pressure transducers and infrared/fiber optic temperature sensors were sited flush with the inner surface of the mixing chamber of a Francis Shaw KO Intermix of 2 L chamber volume. The variation of pressure with transducer position In the chamber wall and with rotor position was measured for selected fill factors and rotor speeds at “equilibrium” conditions (quasi-static power requirement for the mixer) and at intervals during a complete mixing cycle. Two rotor designs were studied. Interpretation of the results was carried out with reference to biconical rotor rheometer measurements on the mixed rubber compounds and by reference to four regimes of viscoelastic behavior identified for two-roll mill mixing. A basic flow analysis was carried out by use of the lubrication approximation in conjunction with an isothermal power-law model.     

密闭式炼胶机密炼室密封斜面的维修

主要介绍了对我公司自行开发设计的F370密炼机密炼室下斜面大量磨损后的修补方法、技术和经验。对F370密炼机进行了受力分析,介绍了镶板式修复方法的工艺过程及尺寸。     

串联密炼机组的研发和应用概况

介绍串联密炼机组的研发和应用概况。串联密炼机组由带压砣的上位机与不带压砣的大容量下位机组成,上位机采用低温转子,下位机采用啮合型转子。串联密炼机组可以实现从原材料投入到终炼胶产出连续一步完成,尤其适用于白炭黑用量大的胶料混炼,可提高混炼质量和生产效率,降低混炼能耗。大连橡胶塑料机械股份有限公司串联密炼机组的结构设计重点:密炼室和转子、传动系统、液压式压砣、冷却系统和过渡翻板门等;系统控制要点:密炼室温度和冷却效果、转子无级调速和压砣位置无级调整等。     

FEM stress analysis and strength prediction of scarf adhesive joints under static bending moments

The stress distributions at the interfaces in the scarf adhesive joints under static bending moments were analyzed using two-dimensional and three-dimensional finite element (FEM) calculations. The effects of the scarf angle, adhesive Young's modulus and the adhesive thickness on the interface stress distribution were examined. It was found that the singular stress at the edges of the interfaces decreased as the adhesive Young's modulus increased and the adhesive thickness decreased. The singular stress at the edges of the interfaces obtained from the 3-D was larger than that from the 2-D FEM. The joint strength was also predicted using the elasto-plastic 3-D FEM calculations. For verification of the FEM calculation results, the strains in the adherends and the joint strengths were measured. The measured results of the strains and the joint strengths were fairly consistent with the results obtained from the 3-D FEM calculations and indicated that the rupture bending moment (joint strength) was the maximum when the scarf angle was around 60°.