發(fā)布時(shí)間：2018-05-14 10:37

  本文選題：滾子輸送鏈 + 振動(dòng)特性��； 參考：《蘭州理工大學(xué)》2016年碩士論文

【摘要】：鏈傳動(dòng)作為一種具有中間撓性件的非共軛嚙合傳動(dòng),具有結(jié)構(gòu)緊湊,工作可靠,承載能力大,效率較高,能保持準(zhǔn)確的平均傳動(dòng)比等優(yōu)點(diǎn)。在鏈傳動(dòng)過程中,由于存在著多邊形效應(yīng)引起的動(dòng)載荷、嚙合時(shí)產(chǎn)生的沖擊載荷、鏈輪與鏈條的磨損等因素,使得鏈傳動(dòng)特別是滾子輸送鏈傳動(dòng)過程中往往出現(xiàn)嚴(yán)重的振動(dòng)現(xiàn)象,從而影響了輸送鏈運(yùn)行的穩(wěn)定性。針對(duì)滾子輸送鏈傳動(dòng)過程中由于振動(dòng)所產(chǎn)生的爬行問題,對(duì)鏈傳動(dòng)的多邊形效應(yīng)、動(dòng)靜載荷、導(dǎo)軌與鏈條間摩擦力等進(jìn)行了分析,建立了滾子輸送鏈動(dòng)力學(xué)模型,得到了其微分方程并求解,得出輸送鏈不產(chǎn)生爬行現(xiàn)象的條件,論證了減小導(dǎo)軌與鏈條動(dòng)靜摩擦力差值、提高系統(tǒng)剛度和減小動(dòng)載荷可以有效地減少系統(tǒng)產(chǎn)生爬行現(xiàn)象�？紤]到鏈條由于設(shè)計(jì)公差、加工和裝配誤差、磨損等因素所導(dǎo)致的鏈條間隙而引起的輸送鏈傳動(dòng)系統(tǒng)不穩(wěn)定問題,為了更加深入地分析滾子輸送鏈傳動(dòng)系統(tǒng)平穩(wěn)性與預(yù)緊力之間的關(guān)系,建立了基于沖擊副模型的輸送鏈銷軸與套筒間隙接觸碰撞動(dòng)力學(xué)模型,得出了系統(tǒng)振動(dòng)與銷軸-套筒間隙、系統(tǒng)參數(shù)、系統(tǒng)載荷之間的關(guān)系式。根據(jù)實(shí)際工況,探討了銷軸-套筒模型在小阻尼情況下的振動(dòng)狀態(tài),求出微分方程并分析,得出輸送鏈的振動(dòng)主要與系統(tǒng)參數(shù)、動(dòng)載荷大小和角頻率、有效圓周力、預(yù)緊力、銷軸-套筒間隙有關(guān),并給出了在相應(yīng)條件下預(yù)緊力的最佳取值。以滾子輸送鏈傳動(dòng)系統(tǒng)的實(shí)際工作特點(diǎn)為基礎(chǔ),在RecurDyn軟件中建立了含多接觸問題的多體動(dòng)力學(xué)模型,對(duì)鏈傳動(dòng)系統(tǒng)進(jìn)行仿真分析驗(yàn)證,分析了預(yù)緊力對(duì)含間隙滾子輸送鏈振動(dòng)特性的影響,論證了輸送鏈預(yù)緊力取合理的值可以有效地減小輸送鏈系統(tǒng)的振動(dòng),為滾子輸送鏈預(yù)緊力的選取提供了理論依據(jù)。最后,設(shè)計(jì)了預(yù)緊力自動(dòng)調(diào)節(jié)系統(tǒng),以便自動(dòng)、定量地調(diào)節(jié)預(yù)緊力,從而使?jié)L子輸送鏈更加穩(wěn)定地運(yùn)行。
[Abstract]:As a kind of non-conjugate meshing transmission with middle flexible parts, chain transmission has the advantages of compact structure, reliable work, high carrying capacity, high efficiency and the ability to maintain accurate average transmission ratio. In the process of chain transmission, there are some factors such as dynamic load caused by polygon effect, impact load during meshing, wear of sprocket and chain, etc. During the process of chain transmission, especially roller conveying chain transmission, there is often a serious vibration phenomenon, which affects the stability of transmission chain operation. Aiming at the crawling problem caused by vibration in roller conveying chain transmission, the polygon effect, static and static load, friction between guide rail and chain are analyzed, and the dynamic model of roller conveying chain is established. The differential equation is obtained and solved, and the condition of no creeping is obtained. It is proved that reducing the difference between the static and static friction between the guide rail and the chain, increasing the stiffness of the system and reducing the dynamic load can effectively reduce the creeping phenomenon of the system. Considering the instability of the chain transmission system caused by the chain clearance caused by the design tolerances, machining and assembly errors and wear and tear of the chain, In order to analyze the relationship between the smoothness of roller conveying chain transmission system and the preload force more deeply, a contact impact dynamic model of transmission chain pin shaft and sleeve clearance based on impact pair model is established. The relationship between system vibration and pin-sleeve clearance, system parameters and system load is obtained. According to the actual working conditions, the vibration state of the pin shaft-sleeve model under the condition of small damping is discussed, and the differential equation is obtained and analyzed. It is concluded that the vibration of the conveying chain is mainly related to the system parameters, the dynamic load and angular frequency, the effective circumference force, the pretightening force, and so on. The pin-sleeve clearance is related, and the optimum value of pretightening force under the corresponding conditions is given. Based on the actual working characteristics of roller conveying chain transmission system, a multi-body dynamic model with multi-contact problem was established in RecurDyn software, and the chain transmission system was simulated and verified. The influence of preloading force on the vibration characteristics of roller conveying chain with clearance is analyzed. It is proved that the reasonable value of preload force of conveying chain can effectively reduce the vibration of conveying chain system, which provides a theoretical basis for the selection of preload force of roller conveyor chain. Finally, a preload automatic adjusting system is designed to adjust the preload automatically and quantitatively, so that the roller conveying chain can run more stably.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TH132.45

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