离心力作用下螺旋推进器强度分析

建立了卧式螺旋卸料沉降离心机螺旋输送器的参数化的三维有限元分析模型,进行了离心力作用下的螺旋输送器强度分析。采用五因素四水平的正交试验法,找出了影响螺旋推进器强度的主要因素。经多变量拟合,得到了离心力作用下螺旋推进器的强度计算公式。     

SolidWorks Simulation在分解槽顶盖支撑梁设计中的应用

本文利用SolidWorks软件建立分解槽顶盖支撑梁三维计算模型,并运用该软件Simulation中的应力分析模块对五种规格的主梁进行了静力分析,并对应力和位移进行了对比分析,给出了运用有限元进行主梁优化设计分析的基本步骤和理论计算结果。     

动平衡技术在卧螺离心机振动问题中的应用

针对某污水处理厂卧式螺旋离心脱水机出现的振动和异常噪声问题进行了研究,通过拆机检查发现卧式螺旋脱水机的螺旋输送器叶片发生了较大磨损,分析表明振动主要由螺旋输送器磨损造成的不平衡引起。对螺旋输送器叶片维修后进行了动平衡校正,装机后振动明显减小,达到安全运行标准。     

FL型粉体螺旋输送器的研究

FL 型粉体螺旋输送器可在封闭系统中对粉体作曲线、多点输送。本文较详细介绍了该输送器的工作原理、结构参数和性能试验分析。     

大长径比卧螺离心机转鼓的有限元分析

利用SolidWorks Simulation有限元分析软件建立了大长径比卧螺离心机转鼓的有限元模型。在高转速下对其正常工作状态下的整体结构进行了模态和静态仿真分析,得到了转鼓的前5阶固有频率、应力分布和径向、轴向变形。结果表明原设计的卧螺离心机转鼓的强度和刚度均满足要求。将有限元分析结果与传统解析解进行比较,结果基本一致。改变转鼓约束面积和约束形式,对转鼓进行优化,寻求了最佳的转鼓轴颈直径;采用柔性支撑消除了主轴承刚度对最高转速的限制性影响,可以将转速提高到3 900 r/min。     

基于SolidWorks的胶管钢丝编织机主传动系统分析

通过构建钢丝编织机主传动系统的的虚拟仿真系统,提高胶管钢丝编织机主传动系统的设计效率。基于SolidWorks平台,建立钢丝编织机主传动系统的三维模型,通过Motion进行运动仿真,获取齿轮的转速曲线,并通过Simulation进行有限元分析,得到钢丝编织机的运动特性,从而优化主传动系统。     

螺旋离心机输送器参数对其强度与变形的影响研究

在诸多参数中,对螺旋离心输送器主要参数:转速、叶片厚、半锥角和导程对其强度和变形的影响进行了分析研究,为已有的卧式螺旋离心机的改造优化和实际应用提供了依据.     

PVC干燥工段螺旋输送器的改造

2004年8月，山东恒通化工股份有限公司（简称恒通化工）4万t／a PVC项目干燥部分的生产调试中，因螺旋输送器出现问题，严重影响了该项目的及时达标达产。出现的主要问题为：①螺旋输送器频繁地发生过载跳闸；②螺旋输送器容易发生“倒风”；③密封件密封效果差，泄漏严重。恒通化工根据螺旋输送器的实际使用情况，进行了一系列的改造，使PVC干燥生产达到了设计的要求。     

PVC气流干燥装置进料工艺的改进

介绍了改进PVC气流干燥进料工艺的具体措施：①改造螺旋输送器桨叶,②在进料位置下部干燥管增加缩喉,③改变螺旋输送器的进料位置,④在螺旋输送器端部增加吹扫气。改造后彻底解决了气流干燥管底部积料的问题,杂质粒子数单项优等品率有所提高。     

用于输送固体颗粒的泵

<正> 用于输送粘性,含固量高的浆液和危险性或胶粘物料的传统机械输送设备,例如开式皮带输送器,链式输送器或螺旋输送器,     

垂直螺旋输送机内物料的运动密度研究

垂直螺旋输送机在依靠离心力和螺旋叶片的摩擦力输送物料的同时,高速旋转的螺旋叶片产生的空气动力作用也促进了物料颗粒的输送,输送机内物料的密度分布很复杂.垂直螺旋输送机内输送物料的流动可视为非牛顿流体流动,用FLUENT流体工程仿真软件模拟水泥在垂直螺旋输送机内输送时的流动状态,并对其运动密度进行了描述和分析.     

Study of Residence Time Distribution in a Pilot-Scale Screw Conveyor Dryer

The screw conveyor dryer (SCD) finds varied applications in the process industries either as a pre-dryer or for post-drying operation. In certain cases, it can be used as the main dryer. The full potential of SCD has not been exploited for the lack of its understanding. The conveying of paste or particles through a screw conveyor may follow a near plug flow behavior; however, it is essential to ascertain a desired level of inter-particle mixing during the course of drying/conveying so as to obtain the desired drying conditions. The effects of feed rate (15–176 kg/h) and screw speed (10.8–28 rpm) on the RTD were studied for the conveying of sand in a pilot-scale SCD using pulse input of a tracer (dye-coated sand). Two new parameters defining the relative stagnancy and screw effectiveness were introduced to study the flow performance of SCD. The flow in the SCD approaches plug flow with an increase in feed rate or by decrease in the screw speed. A low value of the holdback, a parameter of relative stagnancy, indicates the flow in SCD to be near plug flow. Mean residence time was found to be 3 to 4 times longer than the linear residence time due to lower values of screw effectiveness (0.24–0.32).     

Hydrodynamic Characteristics of a Pilot-Scale Screw Conveyor Dryer

This article presents results of an experimental study on the flow characteristics of a pilot-size screw conveyor dryer (SCD). In particular, the effects of granular solids flow rate (15.2-206 kg/h) and screw speed (10.8-28 rpm) on the residence time distribution (RTD) were studied using sand as the model material. The RTD was measured using a dynamic step change in the solids flow rate. Parameters such as solids holdup, degree of fullness, mean residence time, and uniformity of the discharge flow were studied. The solids holdup and hence the degree of fullness was found to decrease with increase in the screw speed and decrease with the solids flow rate. The mean residence time was found to decrease with an increase in the screw speed, as expected. The screw speed and the solids flow rate strongly affected the discharge uniformity. An optimum value of the degree of fullness was observed with regard to the solids flow rate. Over the operating range examined, the solids flow pattern was close to plug flow, as indicated by high values of N and Pe number.     

Hydrodynamic Characteristics of a Pilot-Scale Screw Conveyor Dryer

This article presents results of an experimental study on the flow characteristics of a pilot-size screw conveyor dryer (SCD). In particular, the effects of granular solids flow rate (15.2–206 kg/h) and screw speed (10.8–28 rpm) on the residence time distribution (RTD) were studied using sand as the model material. The RTD was measured using a dynamic step change in the solids flow rate. Parameters such as solids holdup, degree of fullness, mean residence time, and uniformity of the discharge flow were studied. The solids holdup and hence the degree of fullness was found to decrease with increase in the screw speed and decrease with the solids flow rate. The mean residence time was found to decrease with an increase in the screw speed, as expected. The screw speed and the solids flow rate strongly affected the discharge uniformity. An optimum value of the degree of fullness was observed with regard to the solids flow rate. Over the operating range examined, the solids flow pattern was close to plug flow, as indicated by high values of N and Pe number.     

双螺杆中啮合块、螺杆元件混合过程及混合性能的研究

以双螺杆挤出机中的啮合块、螺杆元件作为研究对象,对其混合过程及混合性能进行研究,分析物料与添加剂的相互运动及变化过程。利用网格重叠技术和Ployflow软件对啮合块、螺杆元件的混合性能进行仿真,研究螺杆元件及不同转速下啮合块对应流体区域内的最大剪切应力,粒子在流体区域内的停留时间分布、分布指数、分离尺度等。结果表明:在啮合块流道内的混合过程中,啮合区域的两种粒子进行分布混合,其他区域的粒子在轴向运动到第2片啮合块时开始被带入啮合区,与另一种粒子进行分布混合;在相同转速下,啮合块的混合性能优于螺杆元件,随着转速的提高,啮合块的分散混合性能逐渐增强。     

脱硫橡胶的螺旋输送设计与热平衡计算

一种废旧橡胶动态脱硫新工艺的设备由动态脱硫罐、螺旋输送装置和搅拌冷却换热装置组成,通过脱硫罐先后卸料、螺旋连续输送、搅拌罐冷却的动态脱硫,可有效降低目前脱硫工艺中对环境造成的污染。针对该设备,提出一种螺旋输送及换热能力理论计算方法。通过分析物料受力及摩擦力对物料输送的影响,对螺旋输送的各个参数进行设计及校核,同时对橡胶物料的降温过程进行了热量平衡计算分析。     

同向双螺杆芯轴的受力分析

利用有限元软件ANSYS对啮合同向双螺杆不同形式芯轴的受力状况进行有限元(FEM)模拟分析。通过比较几种芯轴在既定工况下第一主应力、变形和扭转角等,并加以分析,从而找出该工况下受力较好的芯轴形式。其中,六棱形芯轴受力情况最好,渐开线花键芯轴次之,受力最差的是平键芯轴。