【文章內(nèi)容簡介】 的單位，這一矛盾往往阻礙著液壓技術(shù)的進(jìn)一步推廣應(yīng)用。液壓設(shè)備維修需要依賴經(jīng)驗，培訓(xùn)液壓技術(shù)人員的時間較長。 氣壓 傳動方式 優(yōu)點： 1. 以空氣為工作介質(zhì)，工作介質(zhì)獲得比較容易，用后的空氣排到大氣中，處理方便，與液壓傳動相比不必設(shè)置回收的油箱和管道。 2. 因空氣的粘度很?。s為液壓油動力粘度的萬分之一），其損失也很小，所以便于集中供氣、遠(yuǎn)距離輸送。外泄漏不會像液壓傳動那樣嚴(yán)重污染環(huán)境。 Ⅱ 3. 與液壓傳動相比，氣壓傳動動作迅速、反應(yīng)快、維護(hù)簡單、工作介質(zhì)清潔，不存在介質(zhì)變質(zhì)等問題。 4. 工作環(huán)境適應(yīng)性好，特別在易燃、易爆、多塵埃、強磁、輻射、振動等惡劣工作環(huán)境中，比液壓、電子、電氣控制優(yōu)越。 5. 成本低，過載能自動保護(hù)。 缺點： 1. 由 于空氣具有可壓縮性，因此工作速度穩(wěn)定性稍差。但采用氣液聯(lián)動裝置會得到較滿意的效果。 2. 因工作壓力低（一般為 ），又因結(jié)構(gòu)尺寸不宜過大，總輸出力不宜大于 10～ 40kN。 3. 噪聲較大，在高速排氣時要加消聲器。 4. 氣動裝置中的氣信號傳遞速度在聲速以內(nèi)比電子及光速慢，因此，氣動控制系統(tǒng)不宜用于元件級數(shù)過多的復(fù)雜回路。 Ⅱ 致 謝 本論文是在導(dǎo)師劉嘉老師悉心指導(dǎo)下完成的。在學(xué)習(xí)和論文寫作期間 , 劉嘉老師淵博精深的學(xué)術(shù)造詣、嚴(yán)謹(jǐn)求實的治學(xué)精辛、高尚的品德和博大的胸懷 ,時刻都在熏陶著我。我的學(xué)習(xí)和生活中的每一個細(xì)節(jié)都凝聚著老師的辛勤汗水、悉心指導(dǎo)和殷切希望。在此我謹(jǐn)向劉嘉老師及其全家表示由衷的感謝。 最后感謝家人多年來對我生活、學(xué)習(xí)土的支持和精神上的鼓勵 ,使我能夠安洲臼學(xué)習(xí)、順利完成學(xué)業(yè)。也衷心感謝閻啟東先生在我學(xué)業(yè)期間對我的幫助及支持。論文雖然完成 ,但限于個人能力與水平 ,不足之處在所難兔 ,衷心希望老師和同學(xué)以及各位朋友予以批評和指正。 Ⅱ 參考文獻(xiàn) [1] 濮良貴，紀(jì)名剛 .機(jī)械設(shè)計（第八版） [M].北京：高等教育出版社， 2021 [2]王連明，宋寶玉。機(jī)械設(shè)計課程設(shè)計（第四版） [M]哈爾濱：哈爾濱工業(yè)大學(xué)出版社， 2021 [3]朱龍根 .簡明機(jī)械零件設(shè)計手冊 [M].北京：機(jī)械工業(yè)出版社， 2021. [4]謝存禧，李琳 空間機(jī)構(gòu)設(shè)計與應(yīng)用創(chuàng)新 . 北京：機(jī)械工業(yè)出版社， 2021 [5]于靖軍 .機(jī)器人機(jī)構(gòu)學(xué)的數(shù)學(xué)基礎(chǔ) .北京：機(jī)械工業(yè)出版社， 2021 [6]劉極峰，丁繼斌 . 機(jī)器人技術(shù)基礎(chǔ)（第二版） .北京：高等教育出版社， 2021 [7]羅圣國，吳宗澤。機(jī)械設(shè)計課程設(shè)計手冊（第三版） .北京：高等教育出版社， 2021 Ⅱ [8]孫恒，陳作模，葛文杰 .機(jī)械原理（第七版） .北京：高等教育出版社， 2021 Ⅱ 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 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 have time. I think jogging is good for my health. And for me, a girl, it helps me to achieve to eternal goal, to keep slim, He said. He says she prefers jogging alone, so she can focus better. She loves jogging,