液壓升降臺(tái)設(shè)計(jì)

包括論文，完整cad圖紙，答辯ppt

摘    要
本次設(shè)計(jì)任務(wù)是液壓升降臺(tái)，它是一種升降穩(wěn)定性好，適用范圍廣的貨物舉升設(shè)備。其起升高度800mm，舉升重量3T，幅面尺寸2600×1400 mm.其動(dòng)作主要是由兩個(gè)雙作用液壓缸推動(dòng)“X”型架，帶動(dòng)上板移動(dòng)來(lái)實(shí)現(xiàn)的。該液壓升降臺(tái)主要由兩部分組成：液壓部分和機(jī)械部分。設(shè)計(jì)液壓部分時(shí)，先確定了液壓系統(tǒng)方案。選擇液壓基本控制回路時(shí)，換向回路選擇三位四通電磁換向閥；平衡回路選擇用液控單向閥。確定各種基本回路后，又確定了液壓系統(tǒng)傳動(dòng)形式，擬定液壓系統(tǒng)原理圖，然后對(duì)液壓元輔件進(jìn)行了設(shè)計(jì)、選擇，并對(duì)其進(jìn)行校核。經(jīng)過(guò)計(jì)算后液壓缸直徑選定為70毫米，液壓泵選葉片泵。根據(jù)系統(tǒng)工作的最大功率選Y90S-4三相異步電動(dòng)機(jī)。在確定泵后，又對(duì)其他的元輔件進(jìn)行了合理的選擇，最后確定閥塊的設(shè)計(jì)及效率計(jì)算。機(jī)械部分主要由上板架、下板架、內(nèi)連桿和外連桿四部分組成。通過(guò)設(shè)計(jì)、選擇機(jī)械部分材料與結(jié)構(gòu)，并對(duì)其進(jìn)行受力分析與強(qiáng)度校核，結(jié)果證明機(jī)械部分結(jié)構(gòu)設(shè)計(jì)可以滿足要求，進(jìn)一步完成了本次設(shè)計(jì)題目。

關(guān)鍵詞：液壓；升降平臺(tái)；上板架；下板架；內(nèi)連桿；外連桿

 
hydraulic lift platform
Abstract:The task of this design is hydraulic lift platform, it is an carpo lifting equipment with good stablity of taking off and landing. Its lifting height is 800mm, weight lifting is three tons, and frame size is 2600 × 1400 mm. Its action is mainly composed of two pairs of hydraulic cylinders to promote the "X" aircraft, leding to realize the mobile plate.The hydraulic lifting platform is mainly composed of two parts : hydraulic parts and mechanical parts. In the design of the hydraulic parts, I first made sure the hydraulic system. In the process of selecting the basic of hydraulic control loop , the direction loop I chosen to use three position four-way electromagnetic valve,and the balance loop I chosen to use pilot-controlled check value. After the identification of the basic loop, I also made sure the form of hydraulic transmission system, the development of the hydraulic system schematic diagram, and then I designed,selected the hydraulic components and accessories, and checked them. After calculating I selected two 70 mm hydraulic cylinder, I selected the vane pump as the hydraulic pump. According to the maximum power of this system I chosen Y90S-4 three-phase asynchronous motor. After determining the pump, I also chosen the other components and accessories reasonly and finaly I designed the valve block and calculated the efficiency. The mechanical parts is mainly composed of inside and outside link and On board aircraft, the next board aircraft. Through the design, choice of materials and the structure and after the stress analysis and strength of their check, the results proved that the mechanical parts can satisfy the design requirements,which further completed the design of the subject.
Key words: Hydraulic; take-off and landing platform;Inside and outside link

目錄
1 總  論 1
2 確定液壓系統(tǒng)方案 3
2.1確定液壓基本回路 3
2.1.1換向回路 3
2.1.2平衡回路的確定 5
2.2 液壓傳動(dòng)系統(tǒng)的形式確定 7
2．3 液壓系統(tǒng)原理圖 7
3 計(jì)算和選擇液壓元件、輔件 9
3.1液壓缸的計(jì)算 9
3.1.1 初選執(zhí)行元件的工作壓力 9
3.2 液壓輔助元件的計(jì)算及選擇 10
3.2.1管道的設(shè)計(jì) 10
3.2.2管接頭的類(lèi)型 10
3.3油箱的設(shè)計(jì) 10
3.3.1油箱的設(shè)計(jì)要點(diǎn) 11
3.3.2油箱容積計(jì)算 11
3.4  其它元、輔件的選擇 11
3.4.1.吸油濾油器 11
3.4.2選擇濾油器的基本要求 12
3.4.3溢流閥的選擇 12
3.4.4壓力表開(kāi)關(guān)選擇 12
3.4.5單向節(jié)流閥 13
3.4.6 液控單向閥的選擇 13
3.5閥塊的設(shè)計(jì) 13
3.6 效率的計(jì)算 14
3.6.1計(jì)算沿程壓力損失 14
3.6.2效率計(jì)算 16
3.6.3系統(tǒng)發(fā)熱與溫升計(jì)算 16
4 機(jī)械部分的受力分析 17
5 機(jī)械部分的強(qiáng)度校核 20
5.1 內(nèi)連桿強(qiáng)度校核 20
5.2 外連桿強(qiáng)度較核 20
5.3 連接兩連桿的銷(xiāo)軸的強(qiáng)度校核 22
6 總  結(jié) 24
參考文獻(xiàn) 25
致  謝 26