So far,the overhaul of large spherical tank is carried out by building an all-round scaffold in most cases.However,there are many problems in this way,such as high labor intensity,long overhauling period,poor safety,and easy to cause secondary damage and so on.In order to solve problems mentioned above,an interior overhaul workbench of large spherical tank was designed.The workbench consisted of a bottom supporting platform,a central supporting column,a revolving sup-porting platform,a top revolving platform and pulling devices.What's more,it combined a kind of bidirectional traction from the top and bottom and a revolving motion from the top,w hich ensured manned workbasket could be delivered to all the overhauling spots quickly and accurately.The man-ned workbasket,central supporting column and both of the top and bottom revolving supporting arms formed a four-bar mechanism to ensure the manned workbasket remained horizontal throughout the travelling process.In order to verify the reasonability of this workbench,simulation analysis of dynamics and statics was done by MATLAB and ADAMS.The result showed that this workbench met the requirements of bearing capacity,stability and safety.With a simple structure,handling fa-cility,the overhaul workbench is powered by electricity,which is easy to monitor.Therefore,this overhaul workbench will greatly improve the working efficiency of overhauling large spherical tank.%目前,大部分大型球罐内部定检、维修仍采用在球罐内部搭设满堂脚手架的方式,存在劳动强度大、检修周期长、安全性差、易造成罐体二次损伤等问题.为解决上述问题,设计了一种新的大型球罐内部检修工作台,该检修工作台由底部支承平台、中央支撑立柱、回转支撑平台、顶部回转平台和升降牵引装置构成,采用顶、底部双向牵引和顶部水平回转相结合的结构,保证载人工作篮能够快速运行并精确定位至球罐内壁所有检修工作点.载人工作篮、中央支撑立柱与上、下回转支撑臂共同构成平面四杆机构,保证载人工作篮在运动过程中始终保持水平.运用MATLAB和ADAMS对该工作台主要结构进行了动、静力学仿真分析,验证了工作台设计的合理性,结果满足承载力、平稳性、安全性等设计性能指标的要求.该检修工作台结构简单,装卸方便,采用电力驱动,方便设备状态监测、维护,可极大提高大型球罐检修工作效率.
展开▼
