基于离散元法的带式输送机托辊结构优化分析

基于离散元理论,在建立带式输送机离散元模型的基础上,利用赫兹接触理论分析输送机物料装载点的落煤颗粒的能量传递过程,通过对比分析不同槽角输送带在物料输送过程中的底边与侧边的受力情况,得到最优槽角区间,为输送机托辊组的设计提供理论依据与参考。     

Modified three-phase-lag Green–Naghdi models for thermomechanical waves in an axisymmetric annular disk

Abstract

A novel modification for Green and Naghdi thermoelasticity model of type III is proposed in this article. This model is joined to other ones to treat a thermoelastic wave propagation problem in an annular disk. The closed-form solution of thermoelastic analysis of the annular disks has been presented to deduce temperature, radial displacement, dilatation and stresses. Results are illustrated and reported to compare the simple Green–Naghdi II and III and their modified single-, dual- and three-phase-lag models. Concluding remarks are added.     

磁性辊轮驱动装置在切割生产线中的应用

随着汽车及机床行业的发展,板料涂油工艺在汽车零部件生产中应用广泛,从而导致板料在自动切割生产过程中极易打滑跑偏,无法保证传输精度,本文所阐述的磁性辊轮驱动装置从根本上有效解决了此问题,在切割生产线中有广泛的推广价值。     

任意角带式输送机转弯装置应用研究

煤炭运输线路出现变向转弯时，通过多台传统带式输送机搭接实现输送，存在设备投资大、运输系统复杂、人员需求多等问题。介绍了任意角带式输送机转弯装置的工作原理、结构组成和特点，任意角带式输送机转弯装置由转向模块、改向模块、受料模块及其他辅助装置组成，当巷道转弯角度变化后，仅需要调节转向和改向滚筒即可实现带式输送机转向。该设备结构新颖、承载力大、运转安全可靠，可实现对带式输送机防逆转、制动，克服了转向运行时胶带的滑移和受力不均等问题，实现了减人提效，同时，安装时不需要开掘机电设备硐室，减少了巷道工程量，具有广阔的推广前景。     

基于用户体验的压路机操纵手柄交互品质研究

目的以压路机操纵手柄为对象,探讨交互品质研究方法,改进用户体验。方法对交互品质进行解析,由用户体验与交互品质的关联性,提出基于用户体验的交互品质研究方法;面向压路机操纵手柄典型任务进行用户体验研究,梳理压路机手柄的操作流程,并对交互行为进行聚类分析,结合语义分析构建用户体验词库,运用半结构式访谈与问卷调查,以定量与定性方法相结合对驾驶员的操纵体验进行调研;以专家研讨的形式进行驾驶员的操纵体验向交互特征的映射,构建交互特征集,进而对操纵手柄的交互品质进行分析与阐释。结果得出了压路机操纵手柄的交互特征与交互品质。结论通过用户体验可以映射交互特征,得到了交互品质,对于从交互品质的角度指导交互设计提供了借鉴。     

Constructal design of flat tubes cooled by natural convection

A set of vertical flat tubes cooled by natural convection and placed in a finite size space is designed based on the constructal law. The constraint in this design is the size of the space where the tubes are placed. The freedom inside the space is the distance between the tubes. When the constructal law is applied, the optimal distance between the tubes is determined. Rayleigh numbers are taken as (Ra = 10³, 10⁴, and 10⁵). The dimensionless tube diameter (tube diameter/tube height) is changed from (D* = 0.2) to (D* = 1) (circular tube). All the tubes are heated to the same wall temperature. The air used to cool the tubes has a Prandtl number (Pr = 0.72). The equations of conservation of mass, momentum, and energy for steady, two-dimensional, and incompressible flow are solved by the finite volume method. The result showed that the best or optimal distance at a given Rayleigh number remains constant for all tube diameters. The result also showed that the number of the small diameter tubes must be more than the number of the large-diameter tubes for the same Rayleigh number and the same size of the space to make the heat flow from the tubes to the coolant easier.     

公元6世纪前地中海周边地区扁壶发展脉络——兼论北朝胡风扁壶来源

最早的扁壶起源于地中海地区，从埃及的“新年瓶”到科普特人的“朝圣者瓶”，其间有着较为清晰的继承与发展序列，且两类扁壶都随着殖民、贸易或朝圣等活动辐射到地中海东部地区。公元6世纪，伴随丝绸之路的东西方交往，朝圣者瓶极有可能传播到了中原地区。中原工匠选取当时流行的胡人乐舞为主题，结合中国传统扁壶与佛教造像的装饰细节，创新出了用于陪葬的精美胡风扁壶。     

带式输送机中盘式制动器能量传递的研究

基于制动过程能量传递的研究,分析了盘式制动器制动过程能量的转换,摩擦热量的产生机理以及在制动器中的传递与耗散,对摩擦界面间的传递规律进行了研究,同时分析了制动温度场计算的热物理特性,指出制动器摩擦副的温度分布规律,从而为建立制动器温度场提供了分析模型。     

复摆颚式破碎机的轴承

复摆颚式破碎机上装有两对轴承：一对轴承装在机架与偏心轴之问，通常称为机架轴承，机象军田泵支承偏心轴作叫转运动；另一对轴承装在动颚与偏心轴之间，通常称为动颚轴承，支承动颚在偏心轴回转时作摆动运动。阿对轴承将破碎机运行时的破碎物料负荷传递到机架上．是颚破机重要的零部件之一。