【正文】 ，研制一套功能齊全、造價(jià)低廉的護(hù)理器械尤為重要，在這種背景下，計(jì)算機(jī)控制多功能病理床應(yīng)運(yùn)而生了。在此推動(dòng)下，醫(yī)療護(hù)理器械的開發(fā)勢(shì)頭迅猛，但由于各地經(jīng)濟(jì)發(fā)展的不平衡性以及諸多人為因素的影響，致使許多先進(jìn)的醫(yī)護(hù)設(shè)備得不到應(yīng)用，給患者帶來了許多不便。驅(qū)動(dòng)方式上采用液壓驅(qū)動(dòng)方式，之所以選用液壓系統(tǒng)，是因?yàn)槠溥\(yùn)動(dòng)速度平穩(wěn)，實(shí)用性強(qiáng)。s attention. But because of the unbalance of regional economic progress and a great deal of factitious factor, many advanced medical instrument are not suitably used, which brings a lot of inconveniences. In order to overe difficulties, it is more important to study a suit of medical instrument that is multifunctional and cheap, so multifunctional pathological bed controlled by puter es into being. A kind of multifunction turnover bed for patients is introduced in this paper, which has the functions of raising head, curling legs, side turning over from left to right separately, or raising head and curling legs at the same time according to patient’s requirement. The bed is posed of 8 parts and hydraulic drive is adopted. We make use of the hydraulic system because hydraulic system’s velocity is stable. Each movement is directly driven by both hydraulic cylinders. Raising and falling of the bed is realized by means of diverting valves. The design is making up of three steps .The first。 III 目 錄 摘要 …… ............................................................................................................... I Abstract ...............................................................................................................II 第 1章 緒論 ........................................................................................................ 1 液壓系統(tǒng)綜述 ........................................................................................... 1 病理床國(guó)內(nèi)外研究現(xiàn)狀 ........................................................................... 2 課題研究的意義和目的 ........................................................................... 2 第 2章 病理床液壓伺服系統(tǒng)的設(shè)計(jì) ................................................................ 4 設(shè)計(jì)要求 ................................................................................................... 4 病理床液壓執(zhí)行元件載荷力計(jì)算 ........................................................... 4 進(jìn)行工作情況分析 ............................................................................ 4 頭部運(yùn)動(dòng)時(shí)的負(fù)載情況 .................................................................... 5 膝部彎曲時(shí)的負(fù)載情況 .................................................................... 6 軀干運(yùn)動(dòng)時(shí)的負(fù)載情況 .................................................................... 7 系統(tǒng)方案制定 ........................................................................................... 8 執(zhí)行機(jī)構(gòu)的選擇 ................................................................................ 8 調(diào)速回路的選擇 ................................................................................ 8 換向回路的選擇 ................................................................................ 8 液壓源的選擇 .................................................................................... 8 動(dòng)作順序 ................................................................................................... 8 病理床液壓系統(tǒng)主 要參數(shù)計(jì)算 ............................................................. 10 各液壓缸的載荷力計(jì)算 .................................................................. 10 初選液壓缸工作壓力及液壓缸回油腔背壓力 .............................. 11 液壓缸主要參數(shù)的確定 .................................................................. 11 液壓缸實(shí)際工作壓力的確定 .......................................................... 15 液壓缸實(shí)際所需的流量 .................................................................. 15 液壓缸的輸出功率 .......................................................................... 15 液壓元件的選擇 ..................................................................................... 16 液壓泵的選擇 .................................................................................. 16 IV 電動(dòng)機(jī)功率的確定 .......................................................................... 17 液壓閥的選擇 .................................................................................. 18 管道尺寸的確定 .............................................................................. 19 油箱有效容積的確定 ...................................................................... 19 液壓油的選定 .................................................................................. 20 病理床液壓系統(tǒng)性能驗(yàn)算 ..................................................................... 20 液壓系統(tǒng)壓力損失 .......................................................................... 20 系統(tǒng)溫升驗(yàn)算 .................................................................................. 22 本章小結(jié) ................................................................................................. 23 第 3章 病理床所用液壓缸基本尺寸的設(shè)計(jì) .................................................. 24 液壓缸主要尺寸的確定 ......................................................................... 24 液壓缸內(nèi)徑及活塞桿直徑的確定 .................................................. 24 缸筒壁厚的計(jì)算 .............................................................................. 24 缸體外徑的計(jì)算 .............................................................................. 24 液壓缸工作行程的確定 .................................................................. 24 最小導(dǎo)向長(zhǎng)度的確定 ...................................................................... 25 缸體長(zhǎng)度的確定 .............................................................................. 26 液壓缸的結(jié)構(gòu)設(shè)計(jì) ................................................................................. 27 缸體與缸蓋的連接結(jié)構(gòu) .................................................................. 27 活塞桿與活塞的連接結(jié)構(gòu) .............................................................. 27 密封裝置 .......................................................................................... 27 液壓缸的緩沖裝置 .......................................................................... 28 液壓缸主要零件的材料 .................................................................. 28 液壓缸的安裝方法