【正文】
:中心矩 @ =150mm ③ :實際傳動比 30 ④ :第 Ⅲ 種裝配形式 濟南大學畢業(yè)設計 16 依據(jù)傳動系統(tǒng)結(jié)構(gòu)及動力要求,選用 WD18050Ⅰ 型減速器。 圖 WD150360 型尺寸及裝配型式圖 濟南大學畢業(yè)設計 17 5 各執(zhí)行機構(gòu)零件的設計計算 滾壓機構(gòu)零件的設計計算 壓緊氣缸的選擇計算 對水箱內(nèi)筒使用的材料( 不銹鋼冷軋鋼板)進行壓力測試,測得壓緊力是2313N[6]。 氣缸的選擇: 已知:氣缸的實際負載 F1=2312N,查表可知負載率 β=[6]。42D 610 求得: D==99mm 所以選擇缸徑 D=100mm 的 氣缸。其外形 結(jié)構(gòu)如圖 所示 ,外形尺寸參照表 。 滾壓作業(yè)需要在一個工作平面內(nèi)進行,即需要一個平面來支撐滾壓作業(yè),為此設計了一個套軸。一部分是空心的圓柱軸,一部分是矩形的方枕,其中矩形方枕通過螺栓固定在空心圓柱軸上,方便方枕損壞后更換。套軸的另一端通過一個固定套來固定在后擋板上,為 防止因為自重產(chǎn)生彎曲變形故而設計成空心的,減小自重。 慣性矩 zI = 44()64 Dd? ? = 4 (220 200 )64 ? =36431850 4mm 濟南大學畢業(yè)設計 19 圖 套軸的結(jié)構(gòu)尺寸 在工作過程中 ,套軸主要是承受滾壓輪施加的力,容易產(chǎn)生彎曲變形 。 套軸的校核計算 : 套軸在工作過程中只承受一個滾壓力 F,當該力作用于套軸的中間位置時撓度最大,故只要此時的撓度滿足條件,該套軸合格。 滾壓輪軸的設計計算: 該軸主要是用來支撐滾壓輪的,不傳遞功率和扭矩。 3 段用來安裝滾壓輪,滾壓輪的右側(cè)通過軸肩軸向固定 [3],左側(cè)通過螺母 來固定,由于滾壓輪寬 20mm,為保證可靠固定軸段長應略小于輪轂寬,設計該段軸長 19mm,依靠平鍵傳遞扭矩。具體結(jié)構(gòu)如圖 所示 圖 滾壓輪軸的設計 行走壓緊機構(gòu)及其他零部件的設計 行走機構(gòu)零部件的設計 行走機構(gòu)包括行走輪、導向輪以及蓋板和定位板。行走輪通過支撐軸與行走機構(gòu)的總體框架連接,支撐軸采用可調(diào)節(jié)式的,以便于適應調(diào)節(jié)不同寬度的軌道。工作時在鏈條的帶動下,行走機構(gòu)沿直線導軌運動實施滾壓作業(yè),滾壓完成與否依靠定位傳感器來確定,當行走到定位傳感器位置時,氣缸活塞桿收縮將滾壓輪抬起 [17],同時琴鍵壓緊塊在彈濟南大學畢業(yè)設計 21 簧自身彈力的作用下抬起,松開工件,完成滾壓作業(yè)。為實現(xiàn)該功能采用琴鍵壓緊機構(gòu),該機構(gòu)的工作原理為:氣囊充氣,在氣囊內(nèi)氣壓的作用下 壓緊工件,同時固定在可動琴鍵上的彈簧被拉伸;氣囊放氣,彈簧在自身彈力的作用下恢復原位,可動琴鍵 (結(jié)構(gòu)如圖 所示 )抬起松開工件。氣囊的充氣放氣由腳踏開關來控制。 圖 可動琴鍵三維結(jié)構(gòu)圖 彈簧的選擇計算:彈簧是一種彈性元件 [13],可以在載荷作用下產(chǎn)生較大的彈性變形。 已知條件:氣囊的壓力 ,可動琴鍵數(shù) 95 個,氣囊與單個可動琴鍵的接觸面積 S=1050 2mm ,要求中徑 D≈ 15mm,外徑 2D ≤ 18mm。先選用碳素彈簧鋼絲C 級。由機械設計表 163 暫選 B? =2022 MPa,則根據(jù)表 162 可知 ??? = B? =800 MPa。F =F/95=630N () 濟南大學畢業(yè)設計 22 ( 2)根據(jù)強度條件計算彈簧鋼絲直徑 現(xiàn)選取旋繞比 C=6,則由式 ( ) 得 4 1 0 .6 1 544CK CC???? = 4 6 1 6 4 6?? ??? ≈ ( ) 根據(jù)式 ( ) 得 ? ?39。 FKCd ?? = 1 .4 6 4 6 3 0 3 .7 51 .6 640??= 上值與原估取值相近 ,取彈簧鋼絲標準直徑 d=4mm。 其它零部件的設計 滾壓 工序 完成后機器端部的擋板在兩個氣缸作用下抬起,將工件取出 完成一個工件的加工。 氣缸的理論輸出力 F=F1/=,又 261 104F D F??? () 即 =247。根據(jù)擋板的抬起角度,計算得氣缸伸出長度為 300mm,故選用型號為 SC63 300 的氣缸,具體外形尺寸如圖 所示 。本設計主要是進行了傳動方案、整機結(jié)構(gòu)尺寸、滾壓合口機構(gòu)以及行走機構(gòu)各組成部件的設計計算,主要內(nèi)容有以下幾個部分: ( 1)傳動方案的設計主要是針對合口機要實現(xiàn)的功能進行了幾種方案的比較分析,最終結(jié)合機器的工作狀況以及經(jīng)濟因素等各方面確定了最優(yōu)的傳動 方案。 ( 2)整機結(jié)構(gòu)尺寸的設計主要包括: 滾壓機構(gòu)、行走機構(gòu)、 動力箱 、套軸、底座、支架、 支撐 板以及一些氣缸、電器控制件等 的設計。其中滾壓輪進給方式由原來的人工控制進給改成了通過氣缸來自動調(diào)節(jié)控制進給,提高了合口的質(zhì)量;工件固定方式也由原來的人工固定改成了通過氣囊壓緊琴鍵壓緊塊來固定,夾緊更可靠,而且不會對工件表面有所破壞。 本設計具有以下特點: ① 加工出的工件合口質(zhì)量好,不容易出現(xiàn)裂縫漏水的現(xiàn)象; ② 消除了人為因素對加工質(zhì)量的影響; ③ 采用琴鍵壓緊塊固定工件,裝夾可靠,不會在加工過程中出現(xiàn)側(cè)向滑移,提高了合縫的質(zhì)量; ④ 操作簡單,工作效率高,平均工作效率為 45 件 /min。 本課題的研究開展以及論文的撰寫修訂是在導師樊寧教授的悉心指導和親切關懷下完成的。在我進行設計的過程中,樊老師還不厭其煩的進行講解,及時找出在設計上存在的問題,并對問題提出解決方法。 與此同時,還要感謝與我共同開展設計工作的幾位同學,他們在做設計的過程中和我共同探討,并對我的設計工作提出改進意見,為我設計工作的順利進行提供了巨大的幫助。 濟南大學畢業(yè)設計 27 a 您好,為你提供優(yōu)秀的畢業(yè)論文參考資料,請您刪除以下內(nèi)容, O(∩_∩)O 謝謝?。?!A national survey was recently launched to evaluate the eye health of Chinese children n June 6, China39。s digitized society, will also be attached on the report.Myopia is not only a disease that makes people see things blurrily, but also leads to severeplications, such as glaua (increased pressure within the eyeball), and can causeblindness, said Zhou Yuehua, an established eye care specialist with Beijing TongrenHospital.It is very important for parents and children to know about the risk and care for their eyes.There are about 450 million myopia patients in China. Among Chinese myopia patients,30million are severe patients, according to ZhouThe prevalence of myopia among high school and college students is more than 70 percent,and the situation is continuously worsening, he Zhu, director with the China Youth Development Service Center, said long hours ofstudy, lack of exercise, especially outdoor activities, and attachment to electronic screen aresome of the top reasons behind the widespread myopia problems, and the increase ofyounger patients, although China has made great progress in improving the hardwarefacilities and lighting conditions in said he hopes the survey will alert people on the threatening situation, and also helpmedical experts to better guideline parents and children39。s work can be a way to unwind. It is true for He Wenjun, whose workplace is right near the forest park. She discovered her athletic aptitude at the age of seven, when she began playing tennis. Then she turned to jogging, and she has persevered with it for 10 years. I e to jog almost every day after work, whenever I have time. I think jogging is good for my health. And for me, a girl, it helps me to achieve to eternal goal, to keep slim, He said. He says she prefers jogging alone, so she can focus better. She loves jogging, even during Beijing39。ll hold off jogging for a while. But if I really want to get away from work, I39。s health. Poor technique harms the muscles and skeleton, and can cause secondary injures. And, jogging in a bad environment can cause circulation problems, said Lu Zhiyong, attending doctor, Sports Hospital, General Admin. of . Lu has some tips for joggers, and those who are thinking of taking it says people sh ould first evaluate their physical condition, to decide the amount and type of exercise, and jogging in the open air is better running on a treadmill. Conrad Macao will run special programs for the entire month of October this year to support the Hong Kong Cancer Fund39。t conducive to raising a child. She planned to have children once she had achieved career success so she could provide a stable environment for her baby. After 10 years, Xiao felt the time was right, and she tried to conceive for about six months, but was unable to bee pregnant. I conducted prehensive physical checkups. The results suggested that Xiao39。s suggestion that a special day be marked in the year for the global practice of the stressbusting regimen, which is already a multibillion dollar industry in the United States. Modi said in the speech: Yoga is an invaluable gift of Indi