【正文】 式輸送機(jī)（不均勻載荷）、通風(fēng)機(jī)（ ）、旋轉(zhuǎn)式水泵和壓縮機(jī)、發(fā)電機(jī)金屬切削床、旋轉(zhuǎn)篩、劇木機(jī)和木工機(jī)械 載荷變動(dòng)較大 制磚機(jī)、斗式提升機(jī)、往復(fù)式水泵和壓縮機(jī)、起重機(jī)、磨粉機(jī)、沖剪機(jī)、橡膠機(jī)械、振動(dòng)篩、紡織機(jī)械、重載運(yùn)送機(jī) 載荷變動(dòng)很大 破碎機(jī)（旋轉(zhuǎn)式。 （ 1） 確定 計(jì)算功率 CP 由表 查得 AK = ，由 此 得 CAP K P==7= （ 2） 選擇普通 V 帶型號(hào) 根據(jù) CP =， 1 1500 / minnr? ， 由 文獻(xiàn) [2]圖 510 選用 B 型普通 V 帶 （ 3） 確定帶輪基準(zhǔn)直徑 1d 2d 選取 1d =125mm ,且為 B 型 V 帶最小直徑 由 文獻(xiàn) [2]式 (517)得 大帶輪直徑為： 2d = 112 15001500dn dn =125=125mm 由 文獻(xiàn) [2]式 517 則實(shí)際傳動(dòng)比 i ,從動(dòng)輪的實(shí)際轉(zhuǎn)速分別為： 邵陽學(xué)院畢業(yè)設(shè)計(jì)（論文） 16 21125 1125dddi d= = = 12 1500 1 5 0 0 / m in1nnri= = = 從動(dòng)輪的轉(zhuǎn)速誤差率為： 1500 15001500100%=0 在 177。 軸段 Ⅱ 的長度根據(jù) 軸承座端面和帶輪的距離確定為 26mm。 （ 6） 鍵 的 選用 根據(jù)結(jié)構(gòu) 選用 10110 普通 A 型平 鍵 邵陽學(xué)院畢業(yè)設(shè)計(jì)（論文） 21 軸 Ⅱ 的設(shè)計(jì) （ 1） 軸的計(jì)算 30 .9 8 0 .9 4 6 .4DP P KW? ? ? ? （ 2） 選擇軸的材料 ，確定許用應(yīng)力 因我們?cè)O(shè)計(jì)的軸對(duì)材料無特殊要求，故選用 45 鋼并經(jīng)調(diào)質(zhì)處理，由 文獻(xiàn) [3]表 查得強(qiáng)度極限 650B MPa?? ， 許用彎曲應(yīng)力 1[ ] 60b MPas= 。根據(jù)這些因素我決定選擇 W18Cr4V。 邵陽學(xué)院畢業(yè)設(shè)計(jì)（論文） 26 由于該機(jī)節(jié)能 多 、體積小、結(jié)構(gòu)簡單、維護(hù)及操作方便和售價(jià)低廉，因此更加適合于 茶樹種植戶選用。 本次畢業(yè)設(shè)計(jì)使我學(xué)到了不少的東西， 因此 我 認(rèn)識(shí)到 要成為一名優(yōu)秀的機(jī)械 工程師，必須牢固掌 握專業(yè) 知識(shí)，才能高效的解決各種技術(shù)問題。s Shaanxi province pass through a stop on the ancient Silk Road, Gansu39。s Poly Theater. Their show, titled Ulan Muqir on the Grassland, depicted the history and development of the art troupe. Being from the region allowed me to embrace the culture of Inner Mongolia and being a member of the troupe showed me where I belonged, Nasun, the art troupe39。s own path. He urges the reader to find rectitude and lead a moral life. He professes that, only by being self reliant, as opposed to relying on the government and being dictated to by society, can one begin leading a decent and purposeful life. He avers that such a life is the only life worth living. I agree with him. This essay was written during a time of social upheaval in America, and it is rather odd that Emerson authored it, as he was a part of the upper crust of society at the time. It just s o happened that he looked around him, at the indolence and the wantonness of the people in his circle。s Liaoning province, decades ago. The solider gave the old man a handmade saddle when they bid farewell. The story inspired Nasun to write Carved Saddle, a song that later became one of his most popular numbers. Now, every year, Nasun recruits young singers and dancers for the troupe. The troupe has also designed a new repertoire, which is mostly based on the daily lives of Mongolian people, especially the lives of nomadic families, and has bined contemporary musical elements with folk songs of the region. Haimu, a 25yearold khoomei (a local variant of overtone singing) singer, joined the troupe three years ago. Along with a sixmember band, he performs fast songs and soft ones that he writes－ all while playing the horsehead fiddle.Although I learned the piano since childhood and grew up listening to various kinds of music, to me, the folk music of Inner Mongolia is the root, he says. Performing in remote villages is pleasant. I feel at home on the boundless grasslands, and the warm people there make me feel fulfilled. The first round of spring auction season in Beijing ended last week, but it failed to create much spring in the art market. Although two pieces of Chinese painting fetched more than 100 million yuan, the decline in trading volume and sa le rate showed a downturn this year. In the ―Grand View: Chinese Painting Highlight‖ session at China Guardian 2021 spring auctions, Pan Tianshou’s representative work Eagle, Rock and Flora hit a record auction price of 279 million yuan, while Li Keran’s masterwork Jinggang Mountain fetched million yuan, an unexpected high in recent years. However, the trading volume fells to billion yuan from billion yuan in the same period the year before. The Huangchen 2021 Spring Auctions, which recorded million yuan in total sales, experienced the same. The section number went down to 5 from 12 pared to last year. According to expert Shao Jianwu, the art market did not attract much excitement this year due to the booming stock market and the persistent problems of fery and fake deals. The two pieces of Chinese painting notched up high price this spring due to their own value not due to a revival in the market. The successful transaction of two works with a hammer price of more than 100 million yuan once again confirms that valuable and rare works of high quality always earn the longlasting high price. Chinese painting and calligraphy is still the pillar of the market. However, the overall sales rate has dropped slightly, which reflects the demand for the ordinary auction goods has weakened,‖ said the president of China Guardian’s Hu Yanyan. Besides, the entry of new buyers also makes certain changes to the direction of purchasing. In a word, the overall market trend is very unpredictable. Although China Guardian 2021 Spring Auctions has achieved remarkable results, it does not mean that the market has walked out of the predicament. We still have to wait for the big economic boom to invigorate the art market.‖ Even so, the hot pursuit of some special items appeared this spring. A special session of China Guardian Spring Auctions titled ―Fine Gilt—Bronze Buddhist Images‖ achieved a great deal with total sales volume of million yuan and 92 percent sale rate. The 5th Shamar Rinpoche Statue from 1617th century of Tibet was sold for million yuan. The Beijing Chengxuan Auctions featured almost 2,800 items of coins and stamps in three sessions with good sale rate. The Huachen Auctions also set a special session of photographs under the condition of largescale decline of auction sessions. There was a palpable dull thud of disappointment that acpanied the return of the imperial entourage of Zhen Huan to her homeland. It f