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【正文】 大學(xué)生活中,對我學(xué)習(xí)生活上的關(guān)懷和幫助。 結(jié)論 通過此次小型清雪車的設(shè)計(jì)過程中的理論分析和設(shè)計(jì)得出以下結(jié)論: 1.通過研究目前國內(nèi)外該種設(shè)備的發(fā)展情況提出了一種小型清雪設(shè)備的工作原理。通過扶手末端和車架相連,調(diào)節(jié)高度時(shí),先松開螺栓,進(jìn)行調(diào)節(jié)到合適的高度,再擰緊螺栓,這種方法簡潔方便,而且成本低。 載荷 水平面 H 垂直面 V 支反力 F 1NHF =462N 2NHF =50N 1NVF =169N 2NVF =18N 彎矩 M HM =23100Nmm 1VM =8450Nmm 2VM =8132Nmm 總彎矩 1M = 22 845023100 ? =24597Nmm 2M = 22 813223100 ? =24490 扭矩 T 2T =11460N 表 31 核軸的強(qiáng)度 取 ? =,軸上的計(jì)算應(yīng)力 MpaW TMca )(24597)( 3 222212 ?? ????? ?? 軸的材料為 45 鋼,調(diào)質(zhì)處理,查得 ? ?1?? =60MPa。 對于此對軸承 dn=30mm 2021r/min=6 410? < 16 410? 。其中 vrF1 = vrF2 =2rF = = HrF1 = HrF2 =2tF = = 則 1rF = NFF Hrvr 5 61212 ?? 2rF = NFF Hrvr 5 62222 ?? 軸向上沒有受力,所以 021 ?? aa FF 2.求軸承的當(dāng)量動載荷 1P 和 2P 因?yàn)? 011 ?raFF < 1e 022 ?raFF < 2e 式中 1e 、 2e 為判斷系數(shù),其值大于 0。 10′ 43″; 蝸桿軸向齒厚 as = 2) 蝸輪 蝸輪齒數(shù) 2z =51;變位系數(shù) 2x =+; 驗(yàn)算傳動比 這時(shí)傳動比誤差為 是允許的。 20 )(500 qvKzvPF ca ????LKKPPcaP?)( 00 ??濟(jì)南大學(xué)畢業(yè)設(shè)計(jì) 第三章 小型清雪車的設(shè)計(jì)計(jì)算及校核 9 3. 按齒面接觸疲勞強(qiáng)度進(jìn)行設(shè)計(jì) 根據(jù)閉式蝸桿傳動的設(shè)計(jì)準(zhǔn)則,先按齒面接觸疲勞強(qiáng)度進(jìn)行設(shè)計(jì),再校核齒根彎曲疲勞強(qiáng)度。dd LL ?濟(jì)南大學(xué)畢業(yè)設(shè)計(jì) 第三章 小型清雪車的設(shè)計(jì)計(jì)算及校核 8 Z= 公式( 32) 取 0P =; 0P? =; ?K =;LK=, 則 z= 取 z=2 式中 ?K —— 考慮包角不同時(shí)的影響系數(shù); LK—— 考慮帶的長度不同時(shí)的影響系數(shù); 0P —— 單根 A帶的基本額定功率; 0P? 計(jì)入傳動比的影響時(shí),單根 A型帶額定功率的增量。其中左邊攪龍左旋,右邊攪龍右旋,這樣積雪所受的力指向兩個(gè)攪龍的中間部位,使積雪較容易的進(jìn)入后面比清雪鏟要窄的拋雪室內(nèi)。積雪由集雪裝置收集到一個(gè)腔體內(nèi),再由拋雪裝置清除出機(jī)體,拋雪葉輪利用高速旋轉(zhuǎn)時(shí)的離心力將積雪拋出;鼓風(fēng)機(jī)利用氣流將積雪吹出。推移式清雪車只能將積雪推到路邊,不具備集雪能力,且只適用于新鮮雪或破碎后的壓實(shí)雪,效率較低,容易劃傷地面。 本文主要任務(wù) 根據(jù)目前已有的 小型清雪設(shè)備設(shè)計(jì)一種新型適用于學(xué)校、社區(qū)、工廠的小型清雪裝置,能實(shí)現(xiàn)集雪、運(yùn)雪拋雪功能。旋轉(zhuǎn)式除雪機(jī)一般具有切削、集中、推移和拋投的功能,具有結(jié)構(gòu)復(fù)雜、功能多的特點(diǎn)。吹雪式除雪機(jī)一般配備航空發(fā) 動機(jī),產(chǎn)生強(qiáng)大的高壓空氣流由噴口吹除地面積雪。機(jī)械除雪法是通過機(jī)械對冰雪的直接作用而解除冰雪危害的一種方法。設(shè)計(jì)時(shí)充分考慮了各種因素,對其中的關(guān)鍵部件 — 拋雪輪進(jìn)行了有限元分析,并應(yīng)用人機(jī)工程學(xué)原理,可對扶手高度進(jìn)行調(diào)節(jié),使操作更加舒適方便。 本文首先對道路上的壓實(shí)積雪的物理機(jī)械性能進(jìn)行分析研究,并查閱參考了目 前的國內(nèi)外有關(guān)該設(shè)備的大量資料,在已有成果的基礎(chǔ)上,進(jìn)行設(shè)計(jì)計(jì)算和機(jī)構(gòu)創(chuàng)新,這些資料為本文設(shè)計(jì)計(jì)算提供了重要的理論依據(jù)。 各專業(yè)畢業(yè)論文范文盡在道客巴 巴下載 各專業(yè)畢業(yè)論文范文盡在道客巴巴下載 關(guān)鍵詞 : 小型清雪車 三維造型及工程圖 有限元分析 人機(jī)工程 各專業(yè)畢業(yè)論文范文盡在道客巴 巴下載 各專業(yè)畢業(yè)論文范文盡在道客巴巴下載 ABSTRACT After analyzing the various means of snowclearings in the world at present, the project of a sort of mini snowblower fit for China is put forward in this paper. Based on the theory study and applied structural design, the threedimensional solid model and planar drawing have be pleted with Solid Edge engineering software, which can offer an entire technical data and engineering drawings for producing factory. This paper first analyse the physical and mechanical properties of snow paction on the road, then access to a lot of information about this equipment at home and abroad. Design calculations and institutional innovation is based on the result which has been researched. All this information has provided an important theoretical basis for the design calculations and institutional innovate in this paper. On the basis of analysis structure and design theory of the large rotary Snowremoveing machine, arm to the characteristic of snowremoveing in the national pany, Mini Snowblower is deeply reseached and consummated in this paper. Mini Snowblower is designed. Overpass the research and analysis of mini Snowblower nowadays,we realize that the equipment nowadays can carry out the functions of collecting,carrying and throwing there are some disadvantages,for e example, the manipulation is dismodiousness,the efficiency of snow removing is low. Refering to the foundation of the academic researches nowadays, contraposing the deficiency of mini Snowblower , we devise a type of mini Snowblower which with impeller, worm inside and twist collect equipment. Mostly parameters, blue print of drive and modality of structure are plications are calculated during shrowing equipment is finite element analysisd which is pivotal part in mini principium of ergonomics is applied too,the height of handrail can be acmodated. Manipulations get more plete set of banausic structures are brought magnitude of this equipment is moderate. Manipulation is convenience. Appearance is beautiful. During the designing and ploting, the threedimensional solid model, planar drawing
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