畢業(yè)論文-臺式電風扇搖頭裝置設計-wenkub.com
2025-06-02 10:30 本頁面
【正文】 s Day. More and more young Chinese people begin to celebrate this day in a very similar way as that in western countries. Fewer people than ever will gaze at the heavens on Saturday to pick out the two stars shining bright on either side of the Milky Way, that is, if people even know on which day Qixi falls. There are ready reminders dotted about, in the form of big ads saying Sales on Chinese Valentine39。s time for the wild fruits to ripe. The picturesque Arxan in Autumn is indeed a fairyland only exists in a dream that satisfies all your fantasies. If it rains heavily on Saturday night, some elderly Chinese will say it is because Zhinu, or the Weaving Maid, is crying on the day she met her husband Niulang, or the Cowherd, on the Milky Way. Most Chinese remember being told this romantic tragedy when they were children on Qixi, or the Seventh Night Festival, which falls on the seventh day of the seventh lunar month, which is usually in early August. This year it falls on Saturday, August 2. Folklore Story As the story goes, once there was a cowherd, Niulang, who lived with his elder brother and sisterinlaw. But she disliked and abused him, and the boy was forced to leave home with only an old cow for pany. The cow, however, was a former god who had violated imperial rules and was sent to earth in bovine form. One day the cow led Niulang to a lake where fairies took a bath on earth. Among them was Zhinu, the most beautiful fairy and a skilled seamstress. The two fell in love at first sight and were soon married. They had a son and daughter and their happy life was held up as an example for hundreds of years in China. Yet in the eyes of the Jade Emperor, the Supreme Deity in Taoism, marriage between a mortal and fairy was strictly forbidden. He ordered the heaven troop to catch Zhinu back. Niulang grew desperate when he discovered Zhinu had been taken back to heaven. Driven by Niulang39?？偟脕碚f，收獲很大。通過 1 周的學習，也讓我系統(tǒng)的復習了機械設計的相關知識 ，同時也明白了要將理論知識和實踐相結(jié)合，這樣才能真正的掌握知識，提高自己的學習與實踐的能力。然后轉(zhuǎn)換機架，將機架轉(zhuǎn)換至圖一中的搖桿位置，現(xiàn)在同一位置處，設定圖二中的 V1=V2。 選擇材料：蝸桿用 45 鋼，表面硬度 45~50HRC。設計中蝸桿 的直徑為 18， m=,α = ?20 ,γ = ???? ；蝸輪的 Z=30， m=,α = ?20 ,β = ???? ，如此，蝸輪蝸桿輪系的傳動比 i=20，且均為左旋。2Z =17， 39。最終得出理想的傳動比。 圖 最終方案三視圖 四桿長度的定義： 首先定義一個搖桿的長度，再由擺角及行程比系數(shù) K 來估算出曲柄的長度，同時可以由 21m inm ax llll ??? 且最短桿為連架桿來輔助估算，再由圖 得到連桿和機架的長度以及最小傳動角。 上下?lián)u擺方案 圖 上下擺動方案立體圖 該方案中，導軌來控制風扇機頭的上 下?lián)u擺，導軌的形狀可以根據(jù)要求更改來達到不同的上下?lián)u擺效果，并為了美觀將導軌藏于機殼內(nèi)部。所以，改變成方案二使用 A2=｛ a33｝（連桿滑塊機構(gòu)）設計。優(yōu)點是在較小空間內(nèi)可以運動軸線變換，且有自鎖功能。 圖 運動功能圖 4. 機構(gòu)選用 根據(jù)前述要求，電風扇的應作繞一點的往復擺動，且在工作周期中有急回特性。 俯仰運動有兩個基本運動：運動方向變換和周期性俯仰。顯然，為了完成電風扇的擺頭動作，需實現(xiàn)下列運動功能要求： ① 風扇需要 按運動規(guī)律做 左右擺動，因此需要設計相應的擺動機構(gòu)。擬訂運動循環(huán)圖時，執(zhí)行構(gòu)件的動作起止位置可根據(jù)具體情況重疊安排，但必須滿足工藝上各個動作的配合，在時間和空間上不能出現(xiàn)干涉。與急回系數(shù) K＝ 。第 1 頁 共 14 頁 畢業(yè) 設計說明書 課程名稱： 機械設計課程設計 題目名稱： 臺式電風扇搖頭裝置 班 級 姓 名： 學 號：
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