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輪胎側(cè)面撞擊試驗(yàn)裝置機(jī)電系統(tǒng)畢業(yè)論文-全文預(yù)覽

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【正文】 所示。前面巳經(jīng)說過, 鉸點(diǎn)必在AA′連線的垂直平分線L上。一般支撐臂安裝角θ可取10176。保證車門能平移開啟的極限條件是當(dāng)車門從關(guān)閉AB位置移動(dòng)到A″B″位置時(shí), 車門在y座標(biāo)上的位移為車門厚度t, 而在x座標(biāo)上的位移為Δ。因此,A,B兩點(diǎn)的固定鉸點(diǎn)C,D必定在AB弧和A′B′弧的垂直平分線上且AB∥A′B′,AC=BD。下圖為外擺式乘客門的運(yùn)動(dòng)分析簡(jiǎn)圖。 圖4 外擺式客車門示意圖;;;;;它由驅(qū)動(dòng)機(jī)構(gòu)、支撐臂、導(dǎo)向桿、門扇和鎖止機(jī)構(gòu)組成。門扇由上、下兩根支撐臂支撐, 通過轉(zhuǎn)軸帶動(dòng)使門扇平行移動(dòng), 如圖所示。經(jīng)過綜合考慮并保證沖擊工作可靠,選擇缸徑為200mm的沖擊氣缸。要求調(diào)整工作行程, 使活塞桿的位移在沖擊氣缸釋放最大能量范圍里作功。一般沖擊氣缸的沖擊功是指氣壓為5kgf/cm2 ,(一般工業(yè)氣源)時(shí)的額定沖擊能量。在保證密封的條件下, 密封圈的預(yù)壓縮量盡量選得小些, 如采用O 型密封圈, 預(yù)壓縮量取為57% , 活塞、活塞桿及氣缸壁運(yùn)動(dòng)配合面的光潔度為▽8~▽9。角。但噴口太小, 一旦噴口打開后, 氣流從蓄能腔向無桿腔流動(dòng)的阻力增大, 也會(huì)影響沖擊能量。因此需在排氣孔處接一個(gè)低壓排氣閥, 如右圖所示。如果增大蓄能缸的高度, 也即增加蓄能腔容量, 必須同時(shí)加大控制回路中的換向閥和管路通徑, 則沖擊能量將會(huì)增加, 但同時(shí)耗氣量也相應(yīng)增加, 工作頻率降低。m)沖擊氣缸是結(jié)構(gòu)簡(jiǎn)單、成本低、耗氣功率較小的新型氣動(dòng)執(zhí)行元件。1)工作所需功率PW工作主軸所需功率: 式(1) 主機(jī)所需功率Pd: 式(2)式中η為電機(jī)至工作主軸的總效率 η=η1η2η3要實(shí)現(xiàn)無極調(diào)速有3種方式可以實(shí)現(xiàn),即液壓調(diào)速系統(tǒng)、氣壓調(diào)速系統(tǒng)和電機(jī)+變頻器調(diào)速系統(tǒng)。范圍內(nèi)撞擊輪胎,設(shè)計(jì)立柱為后傾式并且橫臂能在其軸線方向上旋轉(zhuǎn)和伸縮。向相反的方向旋轉(zhuǎn)手柄,則電機(jī)反轉(zhuǎn),輪盤逆時(shí)針轉(zhuǎn)動(dòng)。底座為主架,轉(zhuǎn)盤卡爪裝在底座正上方,立柱在正后方,橫臂用以連接立柱和沖擊桿,腳踏安裝在底座前方,方便操作。、本設(shè)計(jì)研究的內(nèi)容本裝置主要由主機(jī)和控制系統(tǒng)組成,管路及電氣裝置聯(lián)系起來組成的一個(gè)整體。此設(shè)備能夠直觀清晰的向消費(fèi)者展示輪胎側(cè)面抗撞擊的能力,消費(fèi)者將很容易了解到輪胎質(zhì)量的好壞。但是在側(cè)面撞擊試驗(yàn)這一方面,我們還沒有形成一套專業(yè)的測(cè)試方法,更加缺少測(cè)試儀器,所以我們必須盡快在這一方面有所突破。美國(guó)《FMVSS119輪胎測(cè)試標(biāo)準(zhǔn)》主要側(cè)重于產(chǎn)品性能方面提高了要求,歐盟REACH法案則更側(cè)重于環(huán)保要求,相對(duì)來說對(duì)于中國(guó)輪胎企業(yè)影響更大的是美國(guó)《FMVSS119輪胎測(cè)試標(biāo)準(zhǔn)》。較之現(xiàn)行的《FMVSS119輪胎測(cè)試標(biāo)準(zhǔn)》,美國(guó)新實(shí)行的《FMVSS139輪胎測(cè)試標(biāo)準(zhǔn)》主要在以下兩個(gè)方面做出了具體規(guī)定:一是安全參數(shù)比現(xiàn)行的標(biāo)準(zhǔn)更加嚴(yán)格。 Outside force bump。設(shè)計(jì)中充分考慮到現(xiàn)有普通輪胎拆裝機(jī)的狀況,基本保持了原輪胎拆裝機(jī)的功能并兼顧了原有扒胎機(jī)設(shè)備的一些性能,增加了工作盤轉(zhuǎn)速可變功能(變頻調(diào)速)、橫臂可沿軸線伸縮并且可繞軸線旋轉(zhuǎn)功能、沖擊桿沖擊輪胎側(cè)面功能、立柱可后傾功能、氣動(dòng)門保護(hù)功能等。針對(duì)目前這個(gè)直接關(guān)乎到汽車運(yùn)行的安全性重要問題,本課題提出了輪胎側(cè)面撞擊試驗(yàn)裝置機(jī)電系統(tǒng)設(shè)計(jì)和研究任務(wù)。本 科 畢 業(yè) 設(shè) 計(jì) (論 文)輪胎側(cè)面撞擊試驗(yàn)裝置機(jī)電系統(tǒng)設(shè)計(jì)Electromechanical system design oftires side impact test device 畢業(yè)設(shè)計(jì)(論文)中文摘要輪胎側(cè)面撞擊試驗(yàn)裝置機(jī)電系統(tǒng)設(shè)計(jì)摘 要:近幾年來,越來越多的消費(fèi)者開始關(guān)注輪胎與汽車駕駛安全性問題。據(jù)我們調(diào)研,目前行業(yè)內(nèi)尚缺乏定量性的檢測(cè)設(shè)備用于輪胎側(cè)面受沖擊的安全性檢測(cè),這給眾多的汽車安全運(yùn)行、正確的養(yǎng)護(hù)帶來了很大問題。本次設(shè)計(jì)的主要內(nèi)容是對(duì)輪胎側(cè)面撞擊實(shí)驗(yàn)裝置的總體的布局、傳動(dòng)機(jī)構(gòu)方案比較、氣壓控制系統(tǒng)、電氣控制系統(tǒng)以及安全保護(hù)系統(tǒng)的分析和設(shè)計(jì)。關(guān)鍵詞:輪胎側(cè)面; 外力撞擊; 測(cè)試 畢業(yè)設(shè)計(jì)(論文)外文摘要Electromechanical system design oftires side impact test deviceAbstract: In recent years, more and more consumer begin to pay close attention to the car driving safety problems with the tires manufacturers, sales units and users to automobile tires pay more and more attention to the safety requirements. Car professionals know, tire surface is the entire tire side the most vulnerable parts, and once the damage will be difficult to repair. According to our research, the industry at present is lack of quantitative inspection equipment to used in tire side impact of safety testing. For many cars safety operation and the correct maintenance bring big problem. According to the important issue of the car runs security, this topic put forward the tire side impact test device for mechanical and electrical system design and research tasks. This design subject involves the purpose of new products is expected that provide a tire side impact resistance of the external force ability test device to tire manufacturers, 4S repair shops and related research unit, and expect to finish all kinds of the equipment on car tires resistance force ability of product profile analysis and parison, for many of the manufacturers, the user to provide maintenance a set of scientific side of the status identification equipment tires. so this topic and the design of the product, innovative products, for many vehicles running safety and in side impact study of tire damage all have the basic theoretical and practical significance.The design of the main content of tire is side impact experiment device overall layout, transmission scheme parison, pressure control system, electrical control system and safety protection system analysis and design. Design is fully considering to the existing of tire installed, keep the original basic tire installed function, Increases the speed variable functions work dish(Variable frequency speed regulation),wishbone can adjustable and rotate, impact stem impact tire side function, column can tilt back function, pneumatic door protection function and so on. Design content more
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