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露天铁矿广泛使用的挖掘机推压齿轮,因其传动设计不够合理,使这一基础件的使用寿命长期徘徊在三个月左右。为了提高其使用寿命,有关部门组织了技术攻关活动.为此,作者提出了该部件的传动设计优化方案.根据路易斯内切抛物线法并结合合理地设计齿根过渡圆弧,确定了齿根危险截面.考虑到齿根应力集中的影响,建立了以齿根最大弯曲应力为目标函数的数学表达式.该方案在保证原推压机构相关尺寸不变的情况下,以齿轮齿顶圆直径、中心距、齿顶厚、重合度和滑动系数为约束条件,建立了推压齿轮传动优化设计的数学模型.采用整实型变量转化,以推压齿轮的实践经验参数作为初始复形,用复形法求解,得到了令人满意的最优解.按优化设计方案制造的推压齿轮在矿山使用的结果表明,寿命提高3～4倍,达到冶金、机械两部“六五”规划的攻关目标,获得良好的经济效益。
Opencast iron widely used excavator push gear, because of its transmission design is not reasonable enough, so that the basic components of the lingering long-term hovering in about three months. In order to improve its service life, the relevant departments organized the technical research activities.Therefore, the author put forward the transmission design optimization scheme of this part.According to the Luis-Necker parabola method and reasonable design of the root transition arc, In consideration of the effect of tooth root stress concentration, a mathematical expression with the maximum root bending stress as the objective function is established. Under the condition that the relative dimensions of the original pressing mechanism are unchanged, Center distance, tooth top thickness, coincidence degree and sliding coefficient as constraints, a mathematical model of push gear transmission optimization design was established.Using the whole real variable transformation, the practical experience of pushing the gear as the initial complex shape, Shape solution, and get a satisfactory optimal solution.Push the optimized design of the use of gear in the mine results show that the life expectancy increased by 3 to 4 times, to metallurgical, mechanical two “Six Five” planning tackling Goal, access to good economic returns.