【正文】 ..... 5 優(yōu)點(diǎn) ............................................................................................................... 6 缺點(diǎn) ............................................................................................................... 6 國(guó)內(nèi)汽車(chē)起重機(jī)行業(yè)發(fā)展現(xiàn)狀 ........................................................................... 7 汽車(chē)起重機(jī)產(chǎn)品分類(lèi) ................................................................................... 7 汽車(chē) 起重機(jī)市場(chǎng)的規(guī)模 ............................................................................... 8 國(guó)內(nèi)汽車(chē)起重機(jī)市場(chǎng)結(jié)構(gòu) ........................................................................... 8 市場(chǎng)競(jìng)爭(zhēng)格局 ............................................................................................... 9 本課題來(lái)源及任務(wù)要求 ....................................................................................... 9 本課題主要研究工作 ......................................................................................... 10 第 2 章 液壓系統(tǒng)性能分析與原理設(shè)計(jì) ................................................. 11 QY8 典型工況分析及對(duì)液壓系統(tǒng)要求 ............................................................. 11 QY8 典型工況的分析 .................................................................................. 11 對(duì)液壓系統(tǒng)要求 ......................................................................................... 11 對(duì) QY8 液壓系統(tǒng)各主要回路的分析 ................................................................ 12 液壓系統(tǒng)類(lèi)型的擬定 ......................................................................................... 17 本機(jī)液壓系統(tǒng)分析 ..................................................................................... 17 各機(jī)構(gòu)動(dòng)作組合、分配及控制 ................................................................. 17 QY8 型汽車(chē)起重機(jī)液壓系統(tǒng)的工作原理總成 ................................................. 19 支腿收放回路 ............................................................................................. 20 吊臂變幅回路 ............................................................................................. 21 吊臂伸縮回路 ............................................................................................. 21 轉(zhuǎn)臺(tái)回轉(zhuǎn)回路 ............................................................................................. 22 吊重起升回路 ............................................................................................. 23 QY8 型汽車(chē)起重機(jī)液壓系統(tǒng)的工作情況表 ........................................... 23 QY8 型汽車(chē)起重機(jī)液壓系統(tǒng)的特點(diǎn) ....................................................... 24 第 3 章 液壓系統(tǒng)計(jì)算 ........................................................................... 25 主要液壓元件的選擇 ......................................................................................... 25 8 噸液壓汽車(chē)起重機(jī)的主要技術(shù)參數(shù)的初定 ....................................... 25 起升馬達(dá)的計(jì)算和選擇 ........................................................................... 25 液壓泵的計(jì)算和選擇 ............................................................................... 27 Ⅲ 液壓系統(tǒng)發(fā)熱溫升計(jì)算 ..................................................................................... 28 計(jì)算液壓系統(tǒng)的發(fā)熱功率 ......................................................................... 28 計(jì)算液壓系統(tǒng)的散熱功率 ......................................................................... 29 第 4 章 變幅液壓缸設(shè)計(jì) ....................................................................... 31 變幅液壓缸的結(jié)構(gòu)設(shè)計(jì) ..................................................................................... 31 缸體端部連接結(jié)構(gòu) ..................................................................................... 31 活塞與活塞桿的連接方式 ......................................................................... 32 活塞桿頭部結(jié)構(gòu) ......................................................................................... 33 缸體安裝形式 ............................................................................................. 33 液壓缸的緩沖裝置 ..................................................................................... 34 排氣裝置 ..................................................................................................... 34 三鉸點(diǎn)變幅油缸的受力分析 ............................................................................. 35 變幅油缸主要幾何的計(jì)算 ................................................................................. 37 油缸內(nèi)徑Ф AL 的計(jì)算 ............................................................................... 38 活塞桿直徑計(jì)算 ......................................................................................... 38 活塞桿彎曲穩(wěn)定性的校核 ......................................................................... 38 液壓缸行程 s 的確定 .................................................................................. 39 最小導(dǎo)向長(zhǎng)度的確定 ................................................................................. 39 缸筒壁厚的計(jì)算 ......................................................................................... 40 缸底厚度計(jì)算 ............................................................................................. 40 第 5 章 起升機(jī)構(gòu)設(shè)計(jì) ............................................................................. 42 起升機(jī)構(gòu)的傳動(dòng)方案的分析 ............................................................................... 42 起升機(jī)構(gòu)的調(diào)速 ................................................................................................... 44 起升機(jī)構(gòu)設(shè)計(jì)計(jì)算 ............................................................................................... 44 起升機(jī)構(gòu) ..................................................................................................... 44 起升機(jī)構(gòu)的零部件選擇計(jì)算 ..................................................................... 45 卷筒設(shè)計(jì) ..................................................................................................... 47 卷筒尺寸的確定 ...............