【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。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。Autumn in the northern part of the country es earlier than the South. A September rain followed by the footprints of Autumn brings more colors to the once emerald green mountain and blooming grassland. wait in the line for one hour to get a ticket, and another two hours at the site, to only see a tiny bit of the place due to the crowds. Last year, 428 million tourists traveled in China over the weeklong holiday in October. Traveling during this period is a matter that needs thorough preparation. If you are short on time to plan the uping Golden Week it may not be a bad idea to avoid some of the most crowded places for now. There is always a place so fascinating that everyone yearns for. Arxan is a place like this. The beauty of Arxan is everlasting regardless of the changing of four seasons. Bestowed by nature, its spectacular seasonal landscape and mountains are just beyond word. Arxan is a crucial destination for the remended travelling route, China Inner Mongolia Arxan — Hailar — Manzhouli. It is also the joint of the four prairies across the SinoMongolian border, where people gravitate towards the exotic atmosphere mixed with Chinese, Russian, and Mongolia elements. As a historic site for the Yitian Battle, Arxan still embodies the spirit of Genghis Khan. Walking into Arxan, you will be amazed by a kaleidoscope of gorgeous colors all the year round the Spring azaleas blooming red in the snow, the Summer sea wavering blue in the breeze, the Autumn leaves painted in yellow covering volcanic traces, and the Winter woods shining white on the vast alpine snowscape. Hinggan League Arxan city is situated in the far eastern area of Inner Mongolia Autonomous Region. Its full name Haren Arxan means hot holy water in the Mongolian language. Arxan is a tourism city in the northern frontier with a blend of large forest, grand prairies, vast snowfield, heaven lake cluster, thermium, as well as volcanic cluster. It is a rare and unique ecotourism base filled with healthy sunshine, clean air and unspoiled green. 2011[9]朱輝，唐保寧，[M].上海：[10]侯洪生. 機(jī)械工程圖學(xué)[M] 北京： 科學(xué)出版社,2001[11]同濟(jì)大學(xué),太原重型機(jī)械學(xué)院等編著. 單斗液壓挖掘機(jī)[M]. 北京：中國(guó)建筑工業(yè)出版社, 1983[12]高衡,張全根. 液壓挖掘機(jī)[M]. 北京：中國(guó)建筑工業(yè)出版社, 1981[13]粱俊有，李洪波. CAD工程設(shè)計(jì)[M]. 呼和浩特： 遠(yuǎn)方出版社, [14] /[M].北京:[15]孫桓，[M].北京：[16] ]李世國(guó)等，Pro/E Wildfire中文版范例教程[M].北京：[17]. Cognitive force control of excavators[M] .ASCE J. Aerosp. Eng., 6 (2) (1993), pp. 148–158[18] M. Hiller, M. Schnider. Modeling, simulation and control of flexible manipulators[M]. Eur. J. Mech. A, Solids, 16 (1997), pp. 127–150 (Special Issue)[19] W. Gutkowski, M. Ch?osta. Sensitivity of the bucket motion in controlled excavation[J].CD Proc. ANC 8th Int. Topical Meeting on Robotics and Remote Systems, Pittsburgh, Pennsylvania (1999)[20],. Experiment on a stable motion of the backhoe excavator bucket[M]. Proc. 18th International Symposium on Automation and Robotics in Construction, Krak243。謝謝你們將所學(xué)無(wú)私的奉獻(xiàn)給我，讓我擁有學(xué)習(xí)和增長(zhǎng)知識(shí)的機(jī)會(huì)。在畢業(yè)設(shè)計(jì)完成之際，在此我向王雷老師表示我最衷心的感謝。致謝在本文的撰寫(xiě)過(guò)程中，王雷老師作為我的指導(dǎo)老師，給予我很多的指導(dǎo)和支持。我的畢業(yè)設(shè)計(jì)是第一次完全自己動(dòng)手，從零開(kāi)始，設(shè)計(jì)個(gè)較為完整的機(jī)械。通過(guò)直觀的三維動(dòng)畫(huà)，可以清晰地觀察挖掘機(jī)的主要工作裝置的結(jié)構(gòu)，了解挖掘機(jī)的運(yùn)動(dòng)關(guān)系。但是對(duì)其內(nèi)部結(jié)構(gòu)及基本原理，知之甚少。具體如下圖?，F(xiàn)在描述下運(yùn)動(dòng)仿真回放的過(guò)程。同理，設(shè)置其他的16個(gè)電機(jī)。這些動(dòng)作的完成是由動(dòng)臂液壓缸、斗桿液壓缸、鏟斗液壓缸在17個(gè)伺服電動(dòng)機(jī)的驅(qū)動(dòng)下進(jìn)行的。本次仿真全部選擇速度來(lái)定義。本文全部采用的是運(yùn)動(dòng)軸伺服電動(dòng)機(jī)。在Pro/E機(jī)械操作環(huán)境中，伺服電動(dòng)機(jī)能為機(jī)構(gòu)提供動(dòng)力，所以仿真的關(guān)鍵是伺服電動(dòng)機(jī)的添加與設(shè)置。表41Pro/E連接方式的解釋說(shuō)明名稱(chēng)符號(hào)自由度操作方式解釋說(shuō)明適用于平移旋轉(zhuǎn)剛性00由組件及元件選幾何圖元，直至完全約束 住兩個(gè)零件粘合在一起，相當(dāng)于固定住元件底座的整體裝配銷(xiāo)釘01選連個(gè)軸，再選兩個(gè)平面元件只能繞軸旋轉(zhuǎn)液壓缸底部圓孔滑動(dòng)桿10選兩個(gè)邊或軸，再