打结器咬绳机构线接触凸轮设计与载荷分析

发布时间：2018-01-08 23:24

本文关键词：打结器咬绳机构线接触凸轮设计与载荷分析　出处：《农业机械学报》2016年07期 　论文类型：期刊论文

【摘要】：针对打结器咬绳机构钩钳受载大、滚子磨损严重的问题,通过对咬绳机构的运动学分析建立了圆柱凸轮轮廓曲面的计算模型,使滚子与凸轮保持线接触的同时钩钳以正弦加速度规律张合。对咬绳机构进行力学分析并结合压簧压缩量和捆绳拉力测试,解析求解钩钳在咬合位置的静力学模型,得出钩钳咬合力的最佳变化范围为300.64~329.89 N。解析求解钳咬机构的动力学模型得出,当钩钳咬合力处于最佳变化范围时,圆柱凸轮的接触力介于240~330 N之间,其峰值可以用于检验滚子的接触疲劳强度,指导钩钳和滚子的材料选择。打结器样机捆扎5 000捆稻麦秸秆的田间试验发现,按预设的压簧压缩量7.5 mm和捆绳初始拉力35 N,钩钳尾部的滚子没有明显磨损,表明钩钳的咬合力控制合适,线接触凸轮改善了滚子的接触受载情况,达到了抗冲击和耐磨的设计要求。
[Abstract]:Aiming at the problem that the hooks and forceps of the rope biting mechanism of the knotter are under heavy load and the roller wear is serious, the calculation model of the cylindrical cam contour surface is established through the kinematics analysis of the rope biting mechanism. While the roller is in line contact with the cam, the hook forceps are combined with the law of sinusoidal acceleration. The mechanical analysis of the rope biting mechanism is carried out, and the compression of the spring and the tension of the tie rope are tested. The best range of the bite force of the hook clamp is 300.64 ~ 329.89N. the dynamic model of the clamp mechanism is obtained by analyzing the statics model of the hook clamp in the bite position. When the bite force of hook and clamp is in the optimum range, the contact force of cylindrical cam is between 240 ~ 330N and its peak value can be used to test the contact fatigue strength of roller. The field experiment of binding 5,000 bales of rice and wheat straw with the prototype of the knotting machine showed that according to the preset compression volume of the spring 7.5 mm and the initial tensile force of the tie rope 35N, the material selection of the hook pliers and rollers should be guided. There is no obvious wear on the roller at the tail of the hook pliers, which indicates that the bite force of the hook pliers is properly controlled, and the linear contact cam improves the contact load of the rollers and meets the design requirements of impact resistance and wear resistance.
【作者单位】：江苏大学现代农业装备与技术教育部重点实验室;
【基金】：国家自然科学基金项目(51375215) 镇江市重点研发计划项目(NY2015009) 江苏高校优势学科建设工程资助项目(苏政办发(2014)37号)
【分类号】：S817.115
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