预紧力对含间隙滚子输送链振动特性的影响及分析

发布时间：2018-05-14 10:37

本文选题：滚子输送链 + 振动特性　；参考：《兰州理工大学》2016年硕士论文

【摘要】：链传动作为一种具有中间挠性件的非共轭啮合传动,具有结构紧凑,工作可靠,承载能力大,效率较高,能保持准确的平均传动比等优点。在链传动过程中,由于存在着多边形效应引起的动载荷、啮合时产生的冲击载荷、链轮与链条的磨损等因素,使得链传动特别是滚子输送链传动过程中往往出现严重的振动现象,从而影响了输送链运行的稳定性。针对滚子输送链传动过程中由于振动所产生的爬行问题,对链传动的多边形效应、动静载荷、导轨与链条间摩擦力等进行了分析,建立了滚子输送链动力学模型,得到了其微分方程并求解,得出输送链不产生爬行现象的条件,论证了减小导轨与链条动静摩擦力差值、提高系统刚度和减小动载荷可以有效地减少系统产生爬行现象。考虑到链条由于设计公差、加工和装配误差、磨损等因素所导致的链条间隙而引起的输送链传动系统不稳定问题,为了更加深入地分析滚子输送链传动系统平稳性与预紧力之间的关系,建立了基于冲击副模型的输送链销轴与套筒间隙接触碰撞动力学模型,得出了系统振动与销轴-套筒间隙、系统参数、系统载荷之间的关系式。根据实际工况,探讨了销轴-套筒模型在小阻尼情况下的振动状态,求出微分方程并分析,得出输送链的振动主要与系统参数、动载荷大小和角频率、有效圆周力、预紧力、销轴-套筒间隙有关,并给出了在相应条件下预紧力的最佳取值。以滚子输送链传动系统的实际工作特点为基础,在RecurDyn软件中建立了含多接触问题的多体动力学模型,对链传动系统进行仿真分析验证,分析了预紧力对含间隙滚子输送链振动特性的影响,论证了输送链预紧力取合理的值可以有效地减小输送链系统的振动,为滚子输送链预紧力的选取提供了理论依据。最后,设计了预紧力自动调节系统,以便自动、定量地调节预紧力,从而使滚子输送链更加稳定地运行。
[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.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TH132.45

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