【正文】 f The emergency stop switch （ 9）選擇拉伸命令，在拉伸命令對話框中，選擇曲面選項中選擇繪制截面，在繪制截面對話框中，類型設(shè)置為在平面上，平面方法設(shè)置為創(chuàng)建平面，指定平面中設(shè)置為 YCZC 平面，點擊平面對話框，在平面對話框中，類型選擇 YCZC,距離設(shè)置為 32mm，點擊確定。用矩形命令畫一個寬為 100mm，高為 150mm的矩形，寬與機(jī)架的邊平行。點擊完成草圖，開始距離設(shè)置為 0mm，結(jié)束距離設(shè)置為32mm，布爾運(yùn)算設(shè)置為無，點擊確定。 一種水稻稻穗自動脫粒系統(tǒng)機(jī)械設(shè)計 33 （ 10）選擇拉伸命令，在拉伸對話框中，選擇曲面指定為剛畫的拉伸體的頂面，在草繪中，選擇帶有淡化邊的線框。用圓命令畫一個直徑為 60mm的圓，圓心的位置在矩形的豎直平分線距離矩形上邊 50mm處。點擊完成草圖，在拉伸對話框中，開始距離設(shè)置為 0mm，結(jié)束距離設(shè)置為 30mm，布爾運(yùn)算設(shè)置為無，點擊確定。 （ 11）選擇拉伸命令，在拉伸對話框中選擇曲面選為剛拉伸矩形的右側(cè)面。 用直線命令，畫一個寬為 30mm，高為 15mm的三角形，長邊與矩形的長邊重合。點擊完成草圖，在拉伸對話框中開始距離設(shè)置為 40mm，結(jié)束距離設(shè)置為 60mm，布爾運(yùn)算設(shè)置為無，點擊確定，得到如下圖 25所示開關(guān)和調(diào)速旋鈕： 圖 25. 開關(guān)和調(diào)速旋鈕的三維實體模型 . The three entity model of the switch and the speed control knob 華中農(nóng)業(yè)大學(xué) 2021屆本科畢業(yè)論文 34 （ 12）由上面步驟得到實驗用水稻脫粒儀的整體裝配圖，如圖 26所示： 圖 26. 裝配的三維實體模型 . The three entity model of the Assembly 5 總結(jié) 本文設(shè)計計算了脫粒儀的主要參數(shù)，通過 UG 對脫粒儀建模以及裝配。設(shè)計計算了包括電動機(jī)，同步帶，軸等主要零部件。運(yùn)用 UG 對這些部件進(jìn)行建模，并最后裝配。水稻是我國糧食之根本，對水稻的研究也是農(nóng)業(yè)的重中之重?，F(xiàn)在市場上還沒有專門對科研水稻脫粒的脫粒儀。本文設(shè)計的脫粒儀，在脫粒時可以保證科研水稻的稻穗的完整性。今后隨著國家對農(nóng)業(yè)研究的投入不斷加大，包括實驗用水稻脫粒儀在內(nèi)的一批解放科研人員勞動力的機(jī)器肯定也會隨之增多的。 一種水稻稻穗自動脫粒系統(tǒng)機(jī)械設(shè)計 35 參考文獻(xiàn) [1] 程友聯(lián)，楊文堤．機(jī)械設(shè)計 [M]．武漢：華中科技大學(xué)出版社， 2021． 156174． [2] 程友聯(lián)．機(jī)械原理 [M]．北京：中國農(nóng)業(yè)出版社， 2021． 85177． [3] 常光寶．水稻谷粒的力學(xué)性能及脫粒損傷機(jī)理的研究 [D]．江蘇：江蘇大學(xué)，2021． [4] 黎震，劉磊． UG NX6中文版應(yīng)用與實例教程 [M]．北京：北京理工大學(xué)出版社， 2021． 78234． [5] 李曼江，何軍，馮欣．脫離機(jī)械與脫粒裝置 [J]．農(nóng)機(jī)化研究， 2021， 2： 12． [6] 劉昌麗，周進(jìn)． UG NX 中文版完全自學(xué)手冊 [M]．北京：人民郵電 出版社， 2021． 66195． [7] 申愛民． UG （實戰(zhàn)篇） [M]．北京：中國鐵道出版社，2021． 78145． [8] 孫麗華．全自動水稻脫粒機(jī)的使用 [J]．農(nóng)村新技術(shù)， 2021， 15： 12． [9] 王世剛，王樹才．機(jī)械設(shè)計實踐與創(chuàng)新 [M]．北京：國防工業(yè)出版社，2021． 4552． [10] 王寧俠．機(jī)械設(shè)計 [M]．北京：機(jī)械工業(yè)出版社， 2021． 150154． [11] 王三民．機(jī)械設(shè)計計算手冊 [M]．北京：化學(xué)工業(yè)出版社， 2021． 279289． [12] 王金武．互換性與測量技術(shù) [M]．北京：中國農(nóng)業(yè)出版社， 2021． 173181． [13] 王顯仁．水稻谷粒的力學(xué)性能及基于能量平衡的脫粒損傷機(jī)理研究 [D]．江蘇：江蘇大學(xué)， 2021． [14] 徐立章，李耀明，李洪昌．水稻谷粒脫粒損傷的影響因素分析 [J]．農(nóng)業(yè)機(jī)械學(xué)報， 2021， 12： 24． [15] 嚴(yán)光彬．水稻脫粒應(yīng)注意的問題 [N]．吉林農(nóng)村報， 20211023． [16] 張?zhí)m星．谷物收割機(jī)原理與計算 [M]．吉林：吉林人民出版社， ． 華中農(nóng)業(yè)大學(xué) 2021屆本科畢業(yè)論文 36 [17] 張彥河，衣淑娟．水稻不同脫粒裝置脫粒性能的對比實驗研究 [J]．農(nóng)業(yè)化研究， 2021， 3： 26． [18] Huang C L, Duan L F, Liu Q et al. 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JP2021020587, 2021126. 一種水稻稻穗自動脫粒系統(tǒng)機(jī)械設(shè)計 37 致 謝 本課題是在老師的指導(dǎo)與監(jiān)督下完成的，細(xì)心的指導(dǎo)與和藹的態(tài)度，給了我很多的自信，讓我順利的完成了這個課題。在完成這個課題的過程中讓我又重溫了大學(xué)的知識，同時也讓我很有成就感。在此由衷的感謝老師對我的幫助。 在完成本課題的過程，也得到了學(xué)長對我的無私的幫助，在此同時感謝學(xué)長，他是我學(xué)習(xí)生活的榜樣。 華中農(nóng)業(yè)大學(xué) 2021屆本科畢業(yè)論文 38 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?。。 national survey was recently launched to evaluate the eye health of Chinese children andteenagers.On June 6, China39。s annual National Day for Eye Care, the China Youth Development ServiceCenter and Zhejiang Medicine, a leading listed Chinese pharmaceutical pany, jointlyannounced the kickoff of the about one month, a questionnaire piled by top eye care medical experts in China willbe distributed through multiple online partners, including , as well asthrough offline survey events held in universities, middle schools and primary schools acrossthe report will be released based on the survey statistics and analysis, and most importantly,guidelines for parents and youth on how to care for the eyes and prevent myopia — agrowing problem in 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 behaviors to care for eyes, basedon the timely and factual statistics the survey series of followup events will also be held in six cities, including Jinan in Shandongprovince, and Changsha in Hunan province, to educate people on how to care for eyes afterthe survey started. More and more Chinese are jogging to get and stay fit. Most joggers will run alone, but some will jog with friends or even coaches. The Beijing Olympic Forest Park is one of the most popular spots. It is packed with runners in the afternoon, usually after work, and at weekends. Jogging after a whole day39。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 hav