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介绍了粉磨机和辊轮部件的设计,考虑到实际生产中恶劣的工况,设计时将三维实体模型导入有限元分析软件Ansys,对辊轮部件的重要零件主支臂进行了静力学分析和强度校核,对辊轮部件装配体进行了模态分析.通过对6阶振型的分析和与实际工作频率的对比,判断哪一阶振型对辊轮部件工作时的影响较大以及是否会出现共振,对于在设计阶段保证设计的准确性具有重要意义. 相似文献
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目前高频焊管机运行不稳定,主要是辊轮寿命较低。本文通过分析和实验,提出了提高辊轮寿命的途径和措施。 相似文献
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目前高频焊管机运行不稳定,主要是辊轮寿命较低。本文通过分析和实验,提出了提高辊轮寿命的途径和措施。 相似文献
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短类零件滚压成形机设计 总被引:1,自引:1,他引:0
详细介绍了短类零件滚压成形中,辊间距大小,辊轮的设计和斜辊技术,并通过链传动实现下辊轮主动,上辊轮被动,上下辊轮节圆不等的成形方法,该技术不仅适用于短类零件的滚压成形,对其它滚压成形设备的设计也具有很大的参考价值。 相似文献
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在JD-DRCF/M型滚动接触疲劳/磨损试验台上开展了有/无偏心车轮配副的轮轨滚滑接触摩擦学试验,对比分析了一阶不圆顺车轮和正常圆顺车轮对轮轨界面黏着、车轮表面损伤与滚动接触疲劳特性的影响。结果表明:车轮不圆顺会显著减小轮轨间黏着系数,湿态下不圆顺车轮的轮轨黏着系数不足0.2,影响列车安全运行和牵引效果;车轮不圆顺明显加剧了钢轨磨耗,同时导致车轮沿周向的表面损伤表现出显著差异。具体来说,凸起侧附近疲劳剥落和撕裂断口特征最为明显;迎向凸起侧较背向凸起侧表面剥落更严重、疲劳裂纹扩展角更大;迎向凸起侧表面点蚀现象相对明显,背向凸起侧车轮表面黏着层堆积严重;此外,随着车轮滚动半径rθ由最小值到最大值再到最小值循环变化,不圆顺车轮沿周向的表面粗糙度、表面硬度和塑性变形层厚度大致均呈先逐渐增加、经过凸起侧附近后又逐渐下降的趋势。 相似文献
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It is shown that the motion of elliptic wheels, usually derived from the antiparallelogram, can be constrained by a crossed transmission belt which is wound around two equal elliptic disks, confocal with the rolling ellipses. By considering the relative paths of belt points, one arrives at a simple gearing system for wheels of this kind which is the natural generalization of the usual involute system for circular wheels. 相似文献
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翻滚式探测机器人设计及运动仿真 总被引:1,自引:0,他引:1
针对探测机器人对未知环境探测时易发生倾覆而丧失运动能力的情况,结合探测机器人运行过程中车载仪器需维持一定的姿态角的功能要求,提出了一种翻滚式探测机器人结构.该机器人由八个驱动轮、两个侧向支撑架以及平衡架组成:八个驱动轮保证机器人发生倾覆后仍有四个驱动轮与地面接触,从而不丧失运动能力;侧向支撑架可使机器人发生侧倾后与地面保持较大的倾角,待稳定后借助驱动力恢复至正常姿态,从而恢复运动能力;平衡架可保证车载仪器的横滚角和俯仰角在探测机器人发生倾覆和侧倾时基本不变.针对探测机器人的上述功能,运用ADAMS进行运动仿真,以验证各部件功能的可实现性.仿真结果表明,翻滚式机器人各部件实现了设计功能. 相似文献
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Xiao Qian Luo Zhixiang Xu Xu Zheng Jifeng Cheng Shu 《Journal of Mechanical Science and Technology》2019,33(2):537-544
Journal of Mechanical Science and Technology - Harmonic wear is one of the common wear phenomena of high-speed train wheels. The change of wheel/rail rolling contact geometry leads to unstable... 相似文献
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Qian Xiao Jifeng Zheng Jihua Liu Jun Fang 《Journal of Mechanical Science and Technology》2017,31(5):2235-2242
The Rolling contact fatigue (RCF) damage of high-speed wheels is a main factor that affects railway safety. This paper presents a Finite element model (FEM) of high-speed transient rolling contact that considers kinetic parameters as initial conditions. This model is used to calculate wheel/rail RCF. With a CRH2 high-speed train as the research object, a head car model is established with the multibody dynamics software UM. The train is driven on a straight track at a speed of 300 km/h. Different contact geometric parameters, such as lateral displacement and attack angle, are obtained. A 3D high-speed transient elastic-plastic FEM of wheel/rail rolling contact is then developed by using ABAQUS with the initial dynamic contact geometric parameters. The actual geometries of the wheel tread and rail head as well as the elastic-plastic properties are considered in this model. This consideration makes the model highly suitable for solving 3D transient rolling contact behavior. The normal force, creep force, and contact area in the contact patch are solved and used in the fatigue model. Owing to the hunting movement of wheels, the wheel/rail force and lateral displacement change significantly at 0.2 and 0.5 s. The longitudinal and lateral creep force increase sharply with the increase in shear stress. The work states of the wheel/rail at 0.2 and 0.5 s easily reach the ratchet effect zone, and the fatigue index is large. The fatigue damage of the wheels is generally near the nominal rolling circle. 相似文献
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凝汽器用多头螺旋槽管长度可达6~15m,两头是光管,中间有一段螺旋槽,因此其成形设备必须具有多头旋轧,非旋转式水平进料,螺旋槽部分长度自动控制、旋轮自动进给这4大特点,才能满足工业化应用的要求。该旋轧设备采用3个旋轮同时轧入,1道次成形;2个光电开关控制凸轮盘正、反转连锁实现旋轮自动进退,完成对螺旋槽部分长度的自动控制;利用前后张紧装置保证坯料在送料过程中不旋转。 相似文献
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对现行汽车前轮梯形转向四杆机构进行了分析 ,指出现行状态下汽车转向时四车轮均实现纯滚动是不可能的。为了让四车轮在转向时实现纯滚动 ,提出四杆机构与凸轮机构组成一个五杆机构 ,并推出该机构中凸轮机构的运动规律 相似文献
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Yu. G. Vasenev V. E. Ermolov V. I. Mel’nik 《Russian Journal of Nondestructive Testing》2006,42(8):525-529
Improving the effectiveness of nondestructive testing of railway rolling stock’s wheel-pair components during their manufacturing and repair is considered. The results of metallographic studies of PY-1 and PY-1III solid-rolled wheels and axles, analysis of the operating specifications, and experimental studies of the optimal methods of nondestructive testing are included. 相似文献