李海涛,熊 亚,陈龙健,张绍英,李 雪,韩鲁佳.打结器割绳脱扣机构磨损分析与改进设计[J].农业机械学报,2015,46(3):118-124.
Li Haitao,Xiong Ya,Chen Longjian,Zhang Shaoying,Li Xue,Han Lujia.Wear Research and Improved Design of D-knotter Wiper Mechanism[J].Transactions of the Chinese Society for Agricultural Machinery,2015,46(3):118-124.
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打结器割绳脱扣机构磨损分析与改进设计   [下载全文]
Wear Research and Improved Design of D-knotter Wiper Mechanism   [Download Pdf][in English]
投稿时间:2014-08-14  
DOI:10.6041/j.issn.1000-1298.2015.03.017
中文关键词:  打捆机 打结器 割绳脱扣机构 磨损 设计
基金项目:长江学者和创新团队发展计划资助项目(IRT1293)和中央高校基本科研业务费专项资金资助项目(2014YJ007)
作者单位
李海涛 中国农业大学 
熊 亚 中国农业大学 
陈龙健 中国农业大学 
张绍英 中国农业大学 
李 雪 中国农业大学 
韩鲁佳 中国农业大学 
中文摘要:针对打结器割绳脱扣机构盘形凸轮内轮廓磨损严重的问题,提出以凸轮理论廓面的等距圆弧面代替现有柱面轮廓的解决方案,即将凸面-凸面和凸面-平面的点接触改进为凸面-凹面的弧点接触;计算得到改进后凸轮轮廓的曲面方程,以及改进前后滚子与凸轮的压力角、初始接触面积和初始最大接触应力;最后,用硬铝合金材料试制改进前和改进后的凸轮,进行磨损对比试验,并定量分析其磨损量。结果表明:改进后滚子与凸轮的压力角在推程开始和接近结束阶段比改进前减小25%左右;改进后滚子与凸轮的初始接触面积比改进前增大约50%,初始最大接触应力减小约38%;各运转10h后,改进后盘形凸轮内轮廓的磨损痕迹宽度比改进前增加31.7%,磨损量减小约50%。
Li Haitao  Xiong Ya  Chen Longjian  Zhang Shaoying  Li Xue  Han Lujia
China Agricultural University,China Agricultural University,China Agricultural University,China Agricultural University,China Agricultural University and China Agricultural University
Key Words:Baler machine D-knotter Wiper mechanism Wear Design
Abstract:In order to solve the serious wear problem of D-knotter wiper inner cam, firstly, a new structure cam was designed. To be more precise, the original cylinder cam contour was replaced by using the offset arc surfaces of the cam theoretical surfaces, which means the point contact manner of convexity-convexity and convexity-plane was substituted by convexity-concave. Secondly, the surface equations of the improved cam were obtained, and then the pressure angle, initial contact area, initial maximum contact stress were calculated. Thirdly, the original and improved cams were manufactured by the turning and milling machine, which were using the aluminum alloy materials. Finally, a contrast experiment of wear pattern between the original and improved cams was designed, and the results were given by quantitative analysis. The results indicated that the improved cam mechanism reduced the pressure angle by an average of 25% than the original one in the majority of the rise travel. In contrast to the original one, the improved cam mechanism’s initial contact area can increase by approximately 50% and the initial maximum contact pressure decreased by 38%. After 10 hours’ runs of each cam mechanisms, the improved cam exceeds the original one by 31.7% in case of the width of the wear trace, and the abrasion value of improved cam is about 50% smaller than the original cam.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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