【作者】 黄海波；

【导师】 万会雄；

【作者基本信息】 武汉理工大学 ， 机械电子工程， 2009， 硕士

【摘要】 回转窑是一种广泛应用于有色冶金、水泥、化工等行业的大型长圆筒设备。回转窑的挡轮装置有机械挡轮和液压挡轮两种型式。液压挡轮作为一种比较先进的挡轮装置,具有省时省力、自动化程度高等特点,是回转窑挡轮装置的主要型式。挡轮液压缸是液压挡轮装置中的关键部件,其运行速度低、活塞杆承受径向力的作用、环境辐射温度高、污染严重、工作条件恶劣。目前,回转窑所用的挡轮液压缸存在的问题是内泄大、密封失效、产生爬行及使用寿命低等。由于要经常更换挡轮液压缸且更换不便,造成人力和物力的大量浪费,严重影响了挡轮装置性能的发挥和回转窑的运转率。因此,开发出结构合理,使用寿命长的挡轮液压缸是回转窑设备改造的重要课题。本文针对挡轮液压缸所存在的问题,提出了改进措施。在挡轮液压缸中采用了辅助支承;将活塞杆上的受力点置于活塞与缸盖上的导向套之间,以减小活塞及支承环上所受的径向力;采用斯特封组合密封件,液压缸几乎无内泄;在活塞及导向套上设置支承环,增加排气装置,可减小活塞与缸筒内孔、活塞杆与导向套之间的机械摩擦,减小磨损,并使液压缸运行稳定、无爬行且安全可靠。改进后的挡轮液压缸运行稳定,其使用寿命提高了十倍以上。本文采用Pro/MECHANICA有限元分析软件,建立了该挡轮液压缸的有限元模型;通过静态结构分析,得到挡轮液压缸在径向载荷作用下的变形和应力分布状况;通过对缸体结构的强度分析,验证了挡轮液压缸能够承受回转窑冲击载荷的作用。此外,根据密封技术的最新发展,对挡轮液压缸密封装置进行了正确选择和设计,这对防止挡轮液压缸的泄漏进而提高挡轮液压缸的工作性能及可靠性具有重要意义。最后,用边界元法对挡轮液压缸流体润滑进行了理论分析,提出了影响挡轮液压缸润滑性能的几个重要因素。改造后的挡轮液压缸可适用于温度达90℃、污染大以及环境恶劣的场合。这对于减少设备的维修量,节约维修费用,提高企业效益,具有积极地作用。改进后的挡轮液压缸还可为其它低速运行的单作用液压缸地研制提供借鉴作用。更多还原

【Abstract】 Gyral kiln is a long tube-shape large-scale equipment,which is widely used in non-ferrous metallurgy,cement,chemical industry and so on.There are two kinds of patterns in its block-wheel device:mechanical block-wheel and hydraulic block-wheel.As a kind of quite advanced block-wheel device,the hydraulic block-wheel device saves time and manpower,and is the main type of block-wheel device in gyral kilns.The block-wheel cylinder is a key component of hydraulic block-wheel device,which is with low speed,high radiation temperature,serious pollution, bad working conditions and bears radial force on piston rod.At present,the problems of hydraulic cylinder is about serious internal leakage,seal failure, crawling and the short service life.For replacing the block-wheel cylinder frequently and inconveniently,it wastes of the manpower and material resource massively,and influences seriously the role of block-wheel device and gyral kiln.Therefore,to develop the block-wheel cylinder with reasonable structure and long service life is the important topic in the transforms of equipments in gyral kiln.Against a series of questions of blocking-wheel cylinder at present,the paper proposes improvement measures.Adopting auxiliary bearing components and changing the action point which push rod exert at piston rod located between the piston and guide sleeve can reduce the radial strength of the piston and support ring received at.With the use of Sitefeng seals,the cylinder does not release nearly. Putting on support ring in the piston and guide sleeve,increasing the air exhaust device,may reduce mechanical friction and the attrition between the piston and in the cylinder tube,as well as between the piston rod and guide sleeve,and causes the hydraulic cylinder moving stable,non-crawling and reliable.The improved blocking-wheel cylinder run steadily and may enhance its service life for ten timesThe paper sets up a finite element model of blocking-wheel cylinder in Pro/MECHANICA.The deformation and stress distribution of the cylinder under radial force are obtained by static structure analysis.Through the strength analysis of the main body,it verifies that blocking-wheel cylinder can bear impact loads by the gyral kilns.In addition,we pay attention closely to the most recent development in the seal technology,the correct choice,the installment and the use of seal,which have the great significance to prevent cylinder’s divulging and the pollution causes from the former and enhance the operating performance and reliability of hydraulic cylinder.Finally,this paper makes the theoretical analysis to fluid lubrication BEM in the block-wheel cylinder,and proposed several important factors which influence the lubricity.After the transformation,the block-wheel cylinder can be suitable for the situation with the temperature 90℃,serious pollution,bad working conditions. This affects positively to reduce maintenance amount,save the maintenance cost, raise the benefit of enterprises.This new hydraulic cylinder may also provide reference for other single-acting cylinders with low speed.更多还原