四光轴导向装配卡滞问题的解决方法

与曲轴连接使用的多轴导向结构在装配过程中易出现光轴卡滞、卡死等情况,通过调节轴孔配合公差、轴套长短、螺钉拧紧力矩、摩擦力等参数,解决了光轴滑动过程中的卡滞、卡死等问题。     

活塞导向长度对油气悬架减振性能的影响

烛式油气悬架兼有主销的作用,所以通常具有2°～5°的安装内倾角,内倾角会造成油气缸承受横向力的作用,从而增大缸筒和活塞之间的摩擦力.摩擦力增大会影响油气缸的减振性和车辆乘坐舒适性,严重时会造成油气缸"摩擦锁死"现象,使油气缸失去减振能力.以某矿用自卸车的烛式油气悬架为研究对象,通过理论分析了缸筒和活塞之间摩擦力的影响因...     

导向机构移动副不发生自锁的条件设计法

自锁是机构设计中需要注意的重要问题之一。如何在设计之初确定不发生自锁的机构尺寸是一个值得探讨的问题。提出了一种简便的条件设计法,利用此法可以通过运动副间的摩擦因数方便地确定移动副不发生自锁的主要结构尺寸。     

新型快速换产滚齿夹具

为了满足市场的多方位需求,生产齿轮的种类繁多,经常会更换加工产品。而换产时间的缩短,能极大地提升生产效率。考虑到每次换产调试夹具,主要是对定位锥、支撑座、压盖和压套的安装调试。针对这几个部件,设计一个新的快速换产滚齿夹具,实现了快速装夹、快速找正、快速调试,从而达到快速换产的目的。     

双列圆锥滚子轴承自锁结构的改进

1改进前结构 用于轮毂的双列圆锥滚子轴承通常要求两内圈能够自锁,以方便安装及拆卸.传统的自锁结构如图1所示,即由两个带L形小油沟的内圈和一个套环组成.套环通常采用弹簧钢板(如65Mn)制造,冲压成形后调质处理,安装时采用滚子定位.该结构存在如下缺点:(1)装配第二列内组件时,套环是通过滚动体(滚子)传递力的,故对轴承有影响;(2)轴承噪声大;(3)轴承装配后套环不能自动复位,有明显的干涉甚至卡死现象.     

自动装卸料机械手设计

针对冶炼、锻造行业高温多粉尘的恶劣工况,为减轻工人劳动强度,提高生产率,设计了自动装卸料机械手。该机械手由机械、液压及电气系统组成,具有四自由度,能够实现大臂回转、升降,小臂伸缩及腕部翻转,适用于自动化生产。     

液压加卸载装置用于衡器静态计量检测的探讨

本文介绍了大型衡器的静态计量性能检测方法及存在的问题,以及可用于衡器静态计量性能检测的液压加卸载装置的工作原理、技术难点和技术方案。     

集装箱装卸冲击力学环境条件研究

分析集装箱装卸冲击特性等环境量值,并结合装卸冲击等力学环境条件对货物的影响,提出安全防护的几点措施。     

工件的加工与检测集成技术研究

以加工中心在线检测技术为主体,针对目前数控机床专用化程度逐步提高的趋势,提出了针对具体工件开发专用数控加工与检测集成系统的概念。系统对工件的基本几何特征进行规划,建立了基本几何量的检测宏程序库并针对具体工件自动形成检测加工程序。     

药品冻干机自动装卸料系统研究

分析了药品冻干机自动装卸料系统功能,给出了设计方案,讨论了功能实现方法.采用模块化设计思想,设计了系统总体结构,对各个机构功能和实现方法做了简要分析,对控制系统进行了较详细的研究.选择西门子S7-300 PLC为控制器,设计了系统硬件结构.阐述了系统软件设计方法、设计过程,编写了PLC控制系统程序,实现了整个自动装卸料过程的自动控制.     

一种用于柔性单元的双摆杆上下料机构

在开发设计柔性加工中心单元的过程中,为了能更好地实现多托盘柔性加工中心单元的上下料,设计了一种双摆杆上下料机构.此机构特点是结构简单、节约空间及易于生产等.     

超大型储煤筒仓在煤炭装卸港口中的创新应用

黄骅港三期工程中堆场采用了超大型筒仓储煤,介绍了筒仓流程和工艺,提出了筒仓安全运营面临的问题,着重介绍了储煤筒仓安全监测装置的选用和布置。     

基于ADAMS的某型艇车装卸载动力学仿真研究

分析了艇车机构组成和机构动作,运用Pro/E和ADAMS建立了艇车装卸系统的虚拟样机模型,对艇车装卸动作进行了动力学分析,得出了主油缸的时域受力曲线和力-位移曲线。仿真结果为艇车装卸机构的有限元分析、机械结构优化、可靠性分析和液压系统选型设计提供了依据。     

A study on fracture behaviors of aluminum and CFRP jointed with pin

Weight reduction has been acknowledged in the automotive industry. Particularly, the weight reduction of automotive body is an ecofriendly technology development, as the corresponding fuel consumption or amount of gas polluting the atmosphere is greatly reduced. As a substitute light-weight material, Aluminum is frequently employed while there is CFRP (carbon fiber reinforced plastic) as the most highlighted material in the future. However, one of the problems is concerned with the coupling of light-weight materials. Particularly, in the case of CFRP having a certain fiber structure orientation, the direction perpendicular to fibers exhibits the disadvantage although each direction of fiber has great advantages in the durability and mechanical properties. Therefore CFRP materials will lose advantages of the material when holes or cracks have occurred in the material. Thus, in this study, mechanical characteristics occurring in stationary parts and cracked parts were investigated by producing holes and cracks in the center of the specimen fixed by a pin by using aluminum-6061, CFRP for woven type, and CFRP for unidirectional type. Also, experimental result data were confirmed by using the finite element analysis method and the verification was made by comparing the data corresponding with experimental data. The structural analyses were performed with the design of fiber structure and the lamination process was used for a more accurate design of CFRP. As experiments were performed by conducting with a universal tester by SHIMADZU Company of AG-X 50 kN, the reliabilities of analyses were verified.     

On the influence of a pin type on the friction losses in pin bearings

The aim of this paper is to analyze lubricated revolute joints from the viewpoint of friction losses. The paper deals with the lubricated revolute joints composed of a pin and two more elements connected by means of the pin. It is considered here how different pin types affect friction losses in pin bearings. Three existing pin types are investigated: a pin press-fitted either in the first or in the second element or the one free to rotate in both elements. As a measure of friction losses, a dissipation function is determined in all three cases. Using the results obtained, the advantages of using the full-floating pin with respect to two other types are demonstrated by means of a numerical example.