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病理床液压伺服系统设计说明书.doc

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病理床液压伺服系统设计说明书.doc

I摘要随着我国医疗事业的发展和计算机的普及与提高,计算机控制技术越来越多地应用于各行各业中,传统的医疗器械已经不能满足患者的需求了。在此推动下,医疗护理器械的开发势头迅猛,但由于各地经济发展的不平衡性以及诸多人为因素的影响,致使许多先进的医护设备得不到应用,给患者带来了许多不便。为了克服这种困难,研制一套功能齐全、造价低廉的护理器械尤为重要,在这种背景下,计算机控制多功能病理床应运而生了。结合病人的需求,设计了一种能自动实现抬头、屈腿、左右侧翻以及同时实现抬头和屈腿等功能的医用多功能病理床。考虑到该病理床要实现各项功能,特将床板分割成八个部分。驱动方式上采用液压驱动方式,之所以选用液压系统,是因为其运动速度平稳,实用性强。每个动作实现都是由两个液压缸同时直接驱动,上升和下降则通过改变换向阀方向来实现。整个设计分为三步进行首先设计出能实现动作要求的液压系统原理图,根据要求选择各标准件其次,进行液压缸体的结构设计及材料的选择最后,做液压站的总体设计。关键词液压系统液压驱动病理床IIAbstractWiththedevelopmentofmedicaltreatmentandtheimprovementofcomputers,computercontroltechniqueismoreandmoreappliedtoallkindsofindustries,whichresultsthesufferersdontsatisfytraditionalmedicalinstruments.Undertheimpulseofthis,theresearchofmedicalinstrumentsgreatlyengagespeoplesattention.Butbecauseoftheunbalanceofregionaleconomicprogressandagreatdealoffactitiousfactor,manyadvancedmedicalinstrumentarenotsuitablyused,whichbringsalotofinconveniences.Inordertoovercomedifficulties,itismoreimportanttostudyasuitofmedicalinstrumentthatismultifunctionalandcheap,somultifunctionalpathologicalbedcontrolledbycomputercomesintobeing.Akindofmultifunctionturnoverbedforpatientsisintroducedinthispaper,whichhasthefunctionsofraisinghead,curlinglegs,sideturningoverfromlefttorightseparately,orraisingheadandcurlinglegsatthesametimeaccordingtopatientsrequirement.Thebediscomposedof8partsandhydraulicdriveisadopted.Wemakeuseofthehydraulicsystembecausehydraulicsystemsvelocityisstable.Eachmovementisdirectlydrivenbybothhydrauliccylinders.Raisingandfallingofthebedisrealizedbymeansofdivertingvalves.Thedesignismakingupofthreesteps.Thefirstwedesignthehydraulicsystemprinciplepictureandchoosethehydraulicstandcomponents.Thesecond,wedesignthehydrauliccylindersconstructionandtheirmaterials.Thelast,wedesignthehydraulicstationanditsarrangement.KeywordsHydraulicSystemTheHydraulicPressureThePathologicBedIII目录摘要...............................................................................................................IAbstract..............................................................................................................II第1章绪论........................................................................................................11.1液压系统综述...........................................................................................11.2病理床国内外研究现状...........................................................................21.3课题研究的意义和目的...........................................................................2第2章病理床液压伺服系统的设计................................................................42.1设计要求...................................................................................................42.2病理床液压执行元件载荷力计算...........................................................42.2.1进行工作情况分析............................................................................42.2.2头部运动时的负载情况....................................................................52.2.3膝部弯曲时的负载情况....................................................................62.2.4躯干运动时的负载情况....................................................................72.3系统方案制定...........................................................................................82.3.1执行机构的选择................................................................................82.3.2调速回路的选择................................................................................82.3.3换向回路的选择................................................................................82.3.4液压源的选择....................................................................................82.4动作顺序...................................................................................................82.5病理床液压系统主要参数计算.............................................................102.5.1各液压缸的载荷力计算..................................................................102.5.2初选液压缸工作压力及液压缸回油腔背压力..............................112.5.3液压缸主要参数的确定..................................................................112.5.4液压缸实际工作压力的确定..........................................................152.5.5液压缸实际所需的流量..................................................................152.5.6液压缸的输出功率..........................................................................152.6液压元件的选择.....................................................................................162.6.1液压泵的选择..................................................................................16IV2.6.2电动机功率的确定..........................................................................172.6.3液压阀的选择..................................................................................182.6.4管道尺寸的确定..............................................................................192.6.5油箱有效容积的确定......................................................................192.6.6液压油的选定..................................................................................202.7病理床液压系统性能验算.....................................................................202.7.1液压系统压力损失..........................................................................202.7.2系统温升验算..................................................................................222.8本章小结.................................................................................................23第3章病理床所用液压缸基本尺寸的设计..................................................243.1液压缸主要尺寸的确定.........................................................................243.1.1液压缸内径及活塞杆直径的确定..................................................243.1.2缸筒壁厚的计算..............................................................................243.1.3缸体外径的计算..............................................................................243.1.4液压缸工作行程的确定..................................................................243.1.5最小导向长度的确定......................................................................253.1.6缸体长度的确定..............................................................................263.2液压缸的结构设计.................................................................................273.2.1缸体与缸盖的连接结构..................................................................273.2.2活塞杆与活塞的连接结构..............................................................273.2.3密封装置..........................................................................................273.2.4液压缸的缓冲装置..........................................................................283.2.5液压缸主要零件的材料..................................................................283.2.6液压缸的安装方法..........................................................................283.3本章小结.................................................................................................28第4章病理床液压站的设计..........................................................................294.1油箱的设计.............................................................................................294.1.1液压油箱容积的确定......................................................................294.1.2油箱的结构设计..............................................................................304.2液压泵组的结构设计.............................................................................314.2.1布置方式..........................................................................................314.2.2连接和安装方式..............................................................................31V4.2.3防振降噪措施..................................................................................324.3本章小结.................................................................................................32结论................................................................................................................33致谢................................................................................................................34参考文献............................................................................................................35附录A................................................................................................................36

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