【正文】 昆明學(xué)院畢業(yè) 設(shè)計(jì) 小型剪叉式液壓升降機(jī) X X 學(xué) 院 XXXX 屆畢業(yè)設(shè)計(jì)（論文） 設(shè)計(jì)（論文）題目 家用升降梯設(shè)計(jì) 子課題題目 小型剪叉式液壓升降機(jī) 姓 名 學(xué) 號(hào) 所 屬 系 自動(dòng)控制與機(jī)械工程系 專業(yè)年級(jí) 指導(dǎo)教師 2021年 5 月 XX 學(xué)院畢業(yè)設(shè)計(jì) 小型剪叉式液壓升降機(jī) 1 摘 要 在設(shè)計(jì)機(jī)械結(jié)構(gòu)時(shí)，采用剪叉式結(jié)構(gòu)。剪叉式機(jī)械結(jié)構(gòu)，使 升降機(jī) 起升有較高的穩(wěn)定性，寬大的作業(yè)平臺(tái)，使高空作業(yè)范圍更大。它使高空作業(yè)效率更高，安全更保障。 在設(shè)計(jì)液壓系統(tǒng)時(shí)，為了能使升降機(jī)在任何情況下工作，采用雙液壓泵，一個(gè)直流驅(qū)動(dòng)液壓泵，工作電壓為 48V；一個(gè)交流驅(qū)動(dòng)液壓泵，工作電壓為 220V。液 壓泵采用柱塞泵，電磁換向閥采用三位三通閥，上升動(dòng)力來源于液壓液壓泵，下降動(dòng)力來源于工作人員和升降機(jī)自身的壓力。 在設(shè)計(jì)控制電路時(shí)，要有限位和自鎖裝置，并設(shè)計(jì)交直流換向開關(guān)和充電開關(guān)。 關(guān)鍵詞：剪叉式，液壓系統(tǒng)，控制開關(guān)。 XX 學(xué)院畢業(yè)設(shè)計(jì) 小型剪叉式液壓升降機(jī) 2 Abstract In the design of mechanical structure, the scissor structure. Fork type mechanical structure, so that the lift lift has the high stability, wide working platform, make the operation more. It makes the operation more efficient, more security protection. In the design of the hydraulic system, in order to be able to lift a job under any circumstances, with the double hydraulic pump, a DC drive hydraulic pump, the working voltage of 48V。 an AC drive hydraulic pump, the working voltage of 220V. Hydraulic pump with plunger pump, an electromagic reversing valve with three valve, rising power from hydraulic pump, decreased power source for staff and lift your pressure. In the design of control circuit, to a limited and a selflocking device, and the design of AC / DC changeover switch and a charging switch. Key words: scissor type, hydraulic system, a control switch. XX 學(xué)院畢業(yè)設(shè)計(jì) 小型剪叉式液壓升降機(jī) 3 目 錄 摘 要 ............................................................................................................................. 1 Abstract.......................................................................................................................... 2 第一章 概 述 ............................................................................................................... 5 升降機(jī)概述 ........................................................................................................ 5 什么是升降機(jī) .......................................................................................... 5 升降機(jī)的發(fā)展歷史 ................................................................................... 5 液壓升降機(jī)的作用和特點(diǎn) ................................................................................... 6 液壓升降 機(jī)的作用 ................................................................................... 6 液壓升降機(jī)的特點(diǎn) ................................................................................... 6 鋁合金液壓升降機(jī) .............................................................................................. 6 鋁合金液壓升降機(jī)的特點(diǎn) ......................................................................... 6 本設(shè)計(jì)的基本參數(shù) ................................................................................... 7 剪叉式鋁合金液壓升降機(jī) ......................................................................... 7 第二章 受力分析 ............................................................................................................. 9 結(jié)構(gòu)分析 ............................................................................................................ 9 第四層剪叉臂受力分析 .......................................................................... 10 第三層剪叉臂受力分析 ...........................................................................11 第二層剪叉臂受力分析 .......................................................................... 12 第一層剪叉臂受力分析 .......................................................................... 13 第三章 結(jié)構(gòu)設(shè)計(jì) ........................................................................................................... 15 材料的選用 ...................................................................................................... 15 選用材料的性能系數(shù) .............................................................................. 15 強(qiáng)度校核計(jì)算 ................................................................................................... 15 剪叉臂的抗彎強(qiáng)度校核計(jì)算 ................................................................... 15 連接螺栓的抗剪強(qiáng)度計(jì)算 ....................................................................... 18 工作平臺(tái)的設(shè)計(jì) ............................................................................................. 19 結(jié)構(gòu)設(shè)計(jì) ............................................................................................. 19 強(qiáng)度校核設(shè)計(jì) ...................................................................................... 19 ....................................................................................................... 20 ..................................................................................... 20 ............................................................................................ 21 ......................................................................................... 22 ....................................................................................................... 24 ......................................................................................... 26 第四章 液壓系統(tǒng)設(shè)計(jì) ................................................................................................... 27 ................................................................................................... 27 .............................................................................. 27 ................................................................................................... 28 ................................................