基于正交理论的刮板输送机驱动链轮参数优化设计

发布时间：2018-07-21 17:51

【摘要】：随着刮板输送机向大功率、重型、超重型方向发展,驱动链轮的过度磨损是导致刮板输送机失效的主要形式。驱动链轮作为刮板输送机链传动系统的核心部件,对刮板输送机的可靠性和运行寿命有着重要影响。对驱动链轮的结构进行优化设计,有助于降低驱动链轮的磨损,提高链传动系统的可靠性,提升刮板输送机的运行效率和使用寿命。论文首先对圆环链与驱动链轮的啮合接触过程进行了受力分析,计算了刮板输送机的运行阻力。使用有限元分析软件ANSYS/LS-DYNA进行了圆环链与驱动链轮啮合接触分析,得出驱动链轮链窝在靠近立环槽部位受力最大,为驱动链轮的结构参数优化奠定了基础。然后将正交优化设计方法引入到了驱动链轮的结构参数优化中。提取了驱动链轮四个关键的结构参数:齿型圆弧半径、链窝弧半径、短齿厚度、链窝长度;使用正交优化设计方案,得出影响驱动链轮啮合接触状态的四个结构参数的最优组合以及对驱动链轮最大应力的影响规律。利用LS-DYNA对圆环链(?14?50)与优化后驱动链轮进行了接触分析,对比优化前后驱动链轮的分析结果,优化后驱动链轮最大应变减小2.586%,最大应力减小2.869%。最后,使用自主设计刮板输送机(SGB420/17)模拟试验台进行了优化前后驱动链轮的磨损试验。通过对比分析优化前后驱动链轮的磨损量和表面形貌,发现在相同试验条件下,优化后驱动链轮链窝的表面形貌更优;优化后的驱动链轮磨损量降低了24.2%,在相同磨损量情况下,优化后驱动链轮运行时间提高了16.7%。从理论与试验方面验证了正交优化结果的有效性,优化了驱动链轮的结构参数,减缓了驱动链轮的磨损,延长了驱动链轮使用寿命。
[Abstract]:With the development of scraper conveyor in the direction of high power, heavy duty and super heavy duty, excessive wear of driving sprocket is the main form of scraper conveyor failure. As the core part of the chain drive system of scraper conveyor, the driving sprocket has an important influence on the reliability and service life of scraper conveyor. Optimizing the structure of the drive sprocket is helpful to reduce the wear of the drive sprocket, improve the reliability of the chain drive system, and improve the efficiency and service life of the scraper conveyor. Firstly, the force of the contact process between the circular chain and the driving sprocket is analyzed, and the running resistance of the scraper conveyor is calculated. The meshing contact analysis of circular chain and drive sprocket is carried out by using ANSYS / LS-DYNA software. The results show that the driving sprocket chain has the largest force near the vertical ring slot, which lays a foundation for the optimization of structural parameters of the drive sprocket. Then the orthogonal optimization method is introduced to the structural parameter optimization of the drive sprocket. Four key structural parameters of driving sprocket are extracted: tooth arc radius, chain pit arc radius, short tooth thickness, length of chain socket. The optimal combination of the four structural parameters affecting the meshing contact state of the drive sprocket and the law of its influence on the maximum stress of the driving sprocket are obtained. Using LS-DYNA, the contact analysis between the circular chain and the optimized sprocket is carried out. The results of the analysis before and after the optimization are compared. The maximum strain of the driven sprocket is reduced by 2.586and the maximum stress is reduced by 2.869. Finally, the wear test of the sprocket driven before and after optimization was carried out by using the self-designed scraper conveyor (SGB420 / 17). By comparing and analyzing the wear amount and surface morphology of the drive sprocket before and after optimization, it is found that under the same experimental conditions, the surface morphology of the drive sprocket nest is better after the optimization, and the wear quantity of the optimized drive sprocket is reduced by 24.2g, under the condition of the same wear amount, The running time of the drive sprocket is increased by 16.7g after optimization. The validity of the orthogonal optimization results is verified theoretically and experimentally. The structural parameters of the drive sprocket are optimized, the wear of the drive sprocket is slowed down, and the service life of the driving sprocket is prolonged.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD528.3

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