【正文】 ican market. Zhen Huan is, of course, the title character of The Legend of Zhen Huan, a 2011 television series that swept China off its feet and later took other Asian countries by storm. Two years ago, it was reported that HBO, a premium cable service headquartered in the United States, was going to air it in North America after some modification. Now, a condensed version that provides English subtitles but no dubbing has finally been made available on Netflix for online streaming. This version, highly anticipated as a milestone in China39。s essay titled SelfReliance. If you39。s essay affects me very deeply. Not as an urging to bee self reliant – I39。 work lives easier, but I simply could not digest the fact that that was my sole purpose in life. With no family to support, I was the sole beneficiary of my employment: the paycheck, the benefits, the incentives and the rewards were mine alone. Not much of a purpose in being selfserving, is there? While I was a student, I felt I was leading a purposeful life. Learning new things, broadening my horizons, expanding my life experiences all gave my life a zip and drive that I had not felt since being in survival mode when my kids were small. After graduating college I felt oddly deflated… but by then, China was on my horizon.34IBLQ型立式旱地驅(qū)動耙畢業(yè)設計 34 。ve been here I have been tasked with nothing more challenging than learning my students39。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 so happened that he looked around him, at the indolence and the wantonness of the people in his circle。s lost, I believe, are the interesting setups and pauses that illuminate the Chinese art of storytelling. Much of the plot is still there. It is the flavor that was sacrificed. The American edition uses the framework of the Empress Dowager in her senior years reminiscing at the beginning and the end of each episode, hinting at what39。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。t have a formal stage. The audience just sat on the grass. Usually, the performances became a big party with local people joining in. For him, the rewarding part about touring isn39。s Shaanxi province pass through a stop on the ancient Silk Road, Gansu39。因此難免存在不足之處，這些都有待于今后作深入的研究。在設計過程中，經(jīng)查閱相關書籍和數(shù)據(jù)，對整個驅(qū)動耙的動力傳輸和相關性能參數(shù)進行分析，現(xiàn)總結(jié)如下：（1）對旱地立式驅(qū)動耙工作部件的運動學進行了理論分析，旋刀的平均工作阻力隨旋刀的轉(zhuǎn)動半徑、機組前進速度、耕深的增加而增加，隨刀盤轉(zhuǎn)速的增加而減小。6. 驅(qū)動耙其它零部件設計本旱地立式驅(qū)動耙采用標準的三點式懸掛機構(gòu)，具有較強的穩(wěn)定性。根據(jù)相關工具書可知，農(nóng)業(yè)機械所用的標準公差等級為IT8,在基孔制的常用優(yōu)先配合選用中，在此選用，此配合要求適合于間隙不大的轉(zhuǎn)動配合，或中等轉(zhuǎn)速與中等軸頸壓力的精確轉(zhuǎn)動。1）刀盤軸：d=35mm,D=80mm,B=21mm, 基本額定動載荷,軸承代號：GB30307軸的轉(zhuǎn)速為，.動載荷系數(shù)，派生軸向力,當時；；時；。 －軸向載荷，N。在圓錐齒輪變速箱及刀盤中，由于軸同時受徑向載荷和軸向載荷，且為方便安裝，外圈分離，所以圓錐滾子軸承。1）軸傳遞的轉(zhuǎn)矩2）齒輪受力 法向載荷直齒錐齒輪齒面所受的通常都視為集中作用在平均分度圓上，受力分別為 — 為法向載荷分解的周向分力 —為法向載荷分解的垂直于分度圓錐母線的分力 —分解的徑向分力 —分解的軸向分力其中滿足關系，.代入，可得153，代入上式，可得, ，3）支承反力的計算a,水平面支承反力由,得 ，代入計算得， =499N由，得 ，代入計算得，=572Nb,垂直面的支承反力由得 ,代入計算得，,=7574)作彎矩圖和扭矩圖a,水平面彎矩圖 ，b,垂直面彎矩圖垂直面彎矩 ,C、合成彎矩圖，d、扭矩圖前已算得4）按當量彎矩計算直徑查表158得，根據(jù)表157公式計算A截面軸徑 ，在結(jié)構(gòu)設計時，取是滿足強度要求的 1） 軸傳遞的轉(zhuǎn)矩 2）齒輪受力 直齒圓柱齒輪傳動時，沿嚙合線作用在齒面上的法向載荷Fn垂直于齒面，在節(jié)點處分解為兩個相互垂直的分力，即圓周了Ft與徑向力Fr,如上圖所示。扭矩強度條件為 （）式中 －軸的扭轉(zhuǎn)切應力，MPa。 軸上的功率P，轉(zhuǎn)速n和轉(zhuǎn)矩T取該級圓錐齒輪傳動的效率（包括軸承效率在內(nèi)）1） 由聯(lián)軸器傳遞給錐齒輪軸I的功率為,傳遞轉(zhuǎn)矩為，轉(zhuǎn)速為。并且在傳遞較大功率時，要求其相應的軸的直徑大。 傳動比的分配如方案三設計，總傳動比，萬向節(jié)輸入動力直接傳給圓錐齒輪組構(gòu)成Ⅰ級傳動，傳動比，把水平方向的動力轉(zhuǎn)變成豎直方向的動力。這三種方案的設計思路是在不斷的摸索、分析、總結(jié)的過程中逐漸形成的，設計方案依次從理論型轉(zhuǎn)向?qū)嵱眯停渲械谌追桨甘沁@三種方案中最成熟也是最實用的。整機幾何參數(shù)為：長（1654mm）、寬（450mm）、高（910mm）、工作時萬向節(jié)銜接點的位置離地面的高度（470mm）。本方案的不足之處在于Ⅲ級傳動的傳動軸采用的是懸臂支承結(jié)構(gòu)，當工作環(huán)境比較惡劣（多石土壤）時，會產(chǎn)生較大的振動和噪音，并會降低該機具的使用壽命。此時刀盤2和刀盤刀盤1和刀盤刀盤3和刀盤6的運動是兩兩對稱關系，每個刀盤產(chǎn)生的橫向分力正好被相對稱的那個刀盤產(chǎn)生的橫向分力相抵消。本課題所取的滿足刀刃一直切土的要求。 旋刀的運動學分析 旋刀在工作時的運動為復合運動，其中繞刀盤中心旋轉(zhuǎn)的運動為相對運動，設圓周速度為，機組勻速前進運動為牽連運動，前進速度。在我國北方地區(qū)，用于大田作物的淺耕滅茬，起到秸稈還田的作用。由于驅(qū)動型機具可以充分利用拖拉機功率，能控制對土壤的作用強度，可滿足多種耕作要求。 水田驅(qū)動耙主要用于水田耕翻后的碎土整地作業(yè)，也可用在未耕地淺耕作業(yè)。 水田軋耙及聯(lián)合耙這類耙在作業(yè)時，工作部件靠土壤阻力滾動前進，常用于水田耕后碎土，使泥土攪混起漿便于插秧。其缺點是圓盤犁的覆蓋性能與溝底平整度