【正文】 022 [18]吳宗澤 .機(jī)械設(shè)計(jì)禁忌 500例 [M].北京：機(jī)械工業(yè)出版社， 1996 [19]《現(xiàn)代機(jī)械傳動(dòng)手冊(cè)》編輯委員會(huì) .現(xiàn)代機(jī)械傳動(dòng)手冊(cè) [M].北京：機(jī)械工業(yè)出版社， 2022 [20]成大先主編 .機(jī)械設(shè)計(jì)手冊(cè)單行本（彈簧 .起重運(yùn)輸件 .五金件） .北京：化工業(yè)出版社 .2022 [21]梁德本，葉玉駒 .機(jī)械制圖手冊(cè) .北京：機(jī)械工業(yè)出版社， 2022 [22]李益 民 主編 .機(jī)械制造工藝設(shè)計(jì)簡明手冊(cè) . 北京：機(jī)械工業(yè)出版社， [23]倪為國，項(xiàng)忠霞 .鈑金加工 .北京： 化工業(yè)出版社， 小型拔梗機(jī)的研究及設(shè)計(jì) 40 致謝 此次畢業(yè)設(shè)計(jì)中，我設(shè)計(jì)的題目是 小型拔梗機(jī)的設(shè)計(jì) ，在整個(gè)設(shè)計(jì)過程中，指導(dǎo)教師曾經(jīng)梁老師付出了很大的心血，從開始制定設(shè)計(jì)日程表，圖紙的繪制到說明書的整理，都在指導(dǎo)老師的指導(dǎo)下有條不紊的進(jìn)行。 經(jīng)過這段時(shí)間的學(xué)習(xí)，不僅拓寬了知識(shí)面，而且鞏固了大學(xué)里學(xué)到的機(jī)械專業(yè)的知識(shí)。最重要的是鍛煉了自己的設(shè)計(jì)能力?？芍^收獲頗豐。當(dāng)然這與老師的指導(dǎo)是分不開的，首先我要感謝我的指導(dǎo)老師 曾經(jīng)梁老師，不厭其煩的為我們糾正錯(cuò)誤，在老師的指導(dǎo)下，遇到的許多問題都一一解決了。我還要感謝學(xué)校的老師，謝謝您們這么多年在學(xué)校對(duì)我的教育和教誨，通過您們的幫助，使我成為了一名合格的大學(xué)畢業(yè)生，成為了國家實(shí)現(xiàn)四個(gè)現(xiàn)代化棟梁之才的。 在平時(shí)的設(shè)計(jì)中，指導(dǎo)教師何老師給了我們很大的自我自由時(shí)間，充分發(fā)揮了我們自己的能力，使我們對(duì)四年來所學(xué)的知識(shí)作了一次徹底的總結(jié)。就設(shè)計(jì)過程中存在的問題及時(shí)提出改進(jìn)方案和建議，同時(shí)針對(duì)設(shè)計(jì)中存在的問題及時(shí)給予詳細(xì)而準(zhǔn)確的解答，并且時(shí)時(shí)不忘督導(dǎo)我們按設(shè)計(jì)日程進(jìn)行設(shè)計(jì)。正是由于指導(dǎo)教師何 老師的這些努力，保證了我們畢業(yè)設(shè)計(jì)的順利進(jìn)行。老師淵博的專業(yè)技術(shù)知識(shí)，嚴(yán)謹(jǐn)務(wù)實(shí)的學(xué)術(shù)精神也在深深感染著我們，為我們今后的生活和工作提供了很好的楷模，在此，我要向指導(dǎo)老師致以最衷心的感謝。 另外，在設(shè)計(jì)過程中，也得到了其他老師的指導(dǎo)幫助，在此也表示衷心的感謝。同時(shí)，我也得到了同組中同學(xué)的幫助，在此也一并表示感謝。另外，也得到了其他同學(xué)的幫助，也表示感謝。 最后再一次忠心的感謝學(xué)校和機(jī)械工程學(xué)院給了我這次畢業(yè)設(shè)計(jì)的機(jī)會(huì)。 I 目 錄 摘 要 .............................................................. 1 第一章 緒論 ........................................................ 3 課題背景 ................................................... 3 我國拔梗機(jī) 的現(xiàn)狀和發(fā)展前景 ................................. 5 我國拔梗機(jī)的現(xiàn)狀 ...................................... 5 我國拔梗機(jī)的發(fā)展前景： ................................ 5 設(shè)計(jì)的主要內(nèi)容 .............................................. 6 第二章 系統(tǒng)總體方案設(shè)計(jì) ............................................ 8 拔梗機(jī)工作原理分析 ......................................... 8 拔梗機(jī)的動(dòng)力分析 ...................................... 9 拔梗機(jī)動(dòng)力輸入裝置的分析 .............................. 9 破土裝置工作時(shí)入土深度的分析 ......................... 10 拔梗機(jī)總體方案的設(shè)計(jì) ...................................... 10 第三章 拔梗機(jī)的設(shè)計(jì) .............................................. 13 拔梗機(jī)動(dòng)力的選擇 .......................................... 13 破土裝置消耗功率 N1................................... 13 拔梗裝置消耗功率 N2................................... 13 莖稈夾持裝置消耗功率 N3............................... 13 莖稈輸送裝置 ......................................... 14 整機(jī)配套功率 N 配 ...................................... 14 鏈傳動(dòng)的設(shè)計(jì) .............................................. 14 確定鏈傳動(dòng)的功率 ..................................... 14 確定鏈條型號(hào)和節(jié)距 P ................................. 16 計(jì)算鏈條節(jié)數(shù)和中心距 ................................. 16 計(jì)算鏈速 v ，確定潤滑方式 ............................. 16 計(jì)算鏈傳動(dòng)作用在軸上的壓軸力 pF ....... 錯(cuò)誤 !未定義書簽。 蝸輪與蝸桿的設(shè)計(jì) .......................................... 17 選擇蝸桿的傳動(dòng)類型和材料 ............................. 17 II 按齒面接觸疲勞強(qiáng)度進(jìn)行設(shè)計(jì) ........................... 18 蝸桿與蝸輪的主要參數(shù)與幾何尺寸 ....................... 19 校核齒根彎曲疲勞強(qiáng)度 ................................. 20 齒輪的設(shè)計(jì)與計(jì)算 .......................................... 21 按彎曲強(qiáng)度確定齒輪模數(shù) ............................... 21 按接觸強(qiáng)度確定齒輪分度圓直徑與中心距 ................. 22 齒寬的確定 ........................................... 23 計(jì)算齒輪相關(guān)參數(shù)、確定各齒輪 ......................... 24 傳動(dòng)箱軸的計(jì)算 ............................................ 24 一軸的設(shè)計(jì) ........................................... 25 二軸的設(shè)計(jì) ........................................... 25 三軸的設(shè)計(jì) ........................................... 26 軸的校核 ................................................... 26 按轉(zhuǎn)矩計(jì)算 ........................................... 27 軸上受力分析 ......................................... 27 求支反力 ............................................. 27 作彎矩和轉(zhuǎn)矩圖 ....................................... 28 確定危險(xiǎn)截面及安全系數(shù)校驗(yàn)計(jì)算 ....................... 31 拔梗裝置的設(shè)計(jì) ............................................ 33 第四章 其它零部件的設(shè)計(jì)與選取 ..................................... 34 軸承的選取 ................................................ 34 傳動(dòng)箱與機(jī)架的設(shè)計(jì) ........................................ 35 聯(lián)軸器的選擇 .............................................. 36 第五章 拔梗機(jī)使用時(shí)應(yīng)注意的事項(xiàng) ................................... 37 開車前應(yīng)注意事項(xiàng) .......................................... 37 開車時(shí)應(yīng)注意事項(xiàng) .......................................... 37 開車后應(yīng)注意事項(xiàng) .......................................... 37 第六章 設(shè)計(jì)總結(jié) ................................................... 38 參考文獻(xiàn) ........................................................... 39 III 致謝 ............................................................... 40 ag an employment tribunal clai Emloyment tribunals sort out disagreements between employers and employees. You may need to make a claim to an employment tribunal if: you don39。t agree with the disciplinary action your employer has taken against you your employer dismisses you and you think that you have been dismissed unfairly. For more informu, take advice from one of the anisations listed under Fur ther help. Employment tribunals are less formal than some other courts, but it is still a legal process and you will need to give evidence under an oath or affirmation. Most people find making a claim to an employment tribunal challenging. If you are thinking about making a claim to an employment tribunal, you should get help straight away from one of the anisations listed under Further help. ation about dismissal and unfair dismissal, see Dismissal. You can make a claim to an employment tribunal, even if you haven39。t appealed against the disciplinary action your employer has taken against you. However, if you win your case, the tribunal may reduce any pensation awarded to you as a result of your failure to appeal. Remember that in most cases you must make an application to an employment tribunal within three months of the date when the event you are plaining about happened. If your application is received after this time limit, the tribunal will not usually accept i. If you are worried about how the time limits apply to you If you are being represented by a solicitor at the tribunal, they may ask you to sign an agreement where you pay their fee out of your pe