用竞选算法优化双万向轴的设计

用竞选算法来优化双万向轴的设计是以中间轴的外径和内径为设计变量,在传递转矩一定的情况下使中间轴的质量最小,并同时满足强度、刚度、振动条件、稳定性及边界条件的约束.实例计算表明,针对双万向轴的优化设计,用竞选算法可以较快地寻找出全局最优解.     

SSWZ330型十字轴万向联轴器的运动学分析

SSWZ330型十字轴万向联轴器广泛应用于重型机械中,但由于制造误差,常出现回转体质量不均衡现象,而产生较大的惯性力,严重影响了其使用寿命。利用CATIA对实际加工的零件进行三维实体造型,装配后导入ADAMS中,并对存在不平衡质量的联轴器进行运动仿真分析。针对变化的轴间角和工作负载,得出输入轴、中间轴及输出轴的角速度变化曲线和转矩运动曲线。通过分析得出万向联轴器出现问题的主要原因,为联轴器的后续加工和安装调试提供理论依据。     

挖掘机行走机构中间轴断轴原因分析

在生产运行中WK－4挖掘机的行走机构容易发生主动轮或中间轴断裂事故．其中间轴断型的原因有以下几种：（1）应力集中检查断裂的中间轴发现,断裂均产生在花键退刀槽处（尺寸为100mm）,即轴的最小截面处。并且,有时花键根部无退刀相或退刀槽过小,致使花键根部应力集中;（2）同心度差行走减速机4段轴是空心花键轴,如装配时与中间轴的中心线不重合时,中间轴不但要承受动力传动时的扭矩,还将承受一个与转动周期一致的弯曲应力,促使中间钻在退刀槽处断裂。预防断轴的措施：空心轴与中间轴装配时应容易安装,4段齿轮响合均匀,无倾斜,…     

十字轴式万向联轴器的运动仿真分析

介绍了十字轴式万向联轴器的运动特性,分别使用转角差、角速度比和转速不均匀系数表示单万向联轴器和双万向联轴器的转动波动性;重点分析了轴线夹角对单万向联轴器不等速传动、双万向联轴器等速传动和不等速传动的影响。仿真分析表明,减小轴线夹角且使两轴线夹角接近,能够有效保证双万向联轴器转动的平稳性。     

安装GAF系列轴流通风机的设计要求(下)

一、GAF系列卧式矿井轴流通风机中间轴校准的设计要求 GAF系列卧式矿井轴流通风机是通过中间轴和两侧的联轴器,将电动机的动力传递给风机的转动部件。 1.中间轴及联轴器的结构:该通风机的中间轴是空心结构,长度约8m左右。其两端各焊接法兰盘一个,以便与电动机端和风机轴承箱端的半刚挠性联轴器相联接,其间不再设轴承。 这种联轴器(图1)上的“8”字弹簧片是用螺栓对称地联接可折卸法兰盘及联轴器体     

利用中间轴作拆建塔绞车

建塔时向上运送塔材,拆塔时向下降放塔材都需要用较多人力,是一件笨重的体力劳动。可在开钻前或终孔停钻后,简单的改装中间轴,将一端的皮带轮用二个螺栓固定一卷筒,用轴上原     

SWC型整体叉头十字轴式万向联轴器的装配

根据十字轴式万向联轴器的结构特点 ,就万向节与轴叉孔的装配进行了分析 ,设计了一种辅助工装 ,改进了装配方法 ,提高了装配精度     

弯外管螺杆钻具装合差的测定方法

螺杆钻具偏斜钻进配备的偏斜器，目前有弯接头和弯外管两种。弯接头与定向接头设计为一整体，共属一条母线，不存在装合差，而弯外管是通过螺纹连接在万向轴节外管下端，定向接头则通过螺纹连接在旁通阀的上端，两者之间有万向轴节外管、定子、旁通阀3道螺纹相连，因此组装好的螺杆钻具之弯外管与定向接头的母线，很难处于同一条直线上，其差值     

WK—4挖掘机推压中间密封装置的固定

WK—4挖掘机的推压中间轴为一齿轮轴,为保证该轴的齿轮与大齿轮正常啮合的润滑及防尘,以及减速机构的装配需要,在齿轮轴的齿轮两侧设有密封装置,原设计中,该装置的定位是依靠减速箱盖上的定位螺栓(M10)     

螺杆钻具万向轴失效分析

对某厂生产的螺杆钻具万向轴失效原因进行了详细分析，指出此万向轴失效的主要原因是由于万向节花瓣部分接触面摩擦力过大，而所用材料热处理工艺不合理，造成硬度过低，耐磨性能太差造成的，并对此提出了相应的改进措施。     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

2014 second batch of rare earth quota released

正~~     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.