尹建军,汲峥,王新新,朱浩.打结嘴缠绳故障分析与曲面形态改进设计[J].农业机械学报,2018,49(7):82-89.
YIN Jianjun,JI Zheng,WANG Xinxin,ZHU Hao.Analysis of Rope-twining Failure of Knotter Hook and Its Improved Design of Curved Surface Shape[J].Transactions of the Chinese Society for Agricultural Machinery,2018,49(7):82-89.
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打结嘴缠绳故障分析与曲面形态改进设计   [下载全文]
Analysis of Rope-twining Failure of Knotter Hook and Its Improved Design of Curved Surface Shape   [Download Pdf][in English]
投稿时间:2018-01-26  
DOI:10.6041/j.issn.1000-1298.2018.07.010
中文关键词:  打捆机  打结器  打结嘴  故障分析  改进设计
基金项目:国家自然科学基金项目(51375215)、国家重点研发计划项目(2016YFD0701700)和江苏高校优势学科建设工程项目(苏政办发[2014]37号)
作者单位
尹建军 江苏大学 
汲峥 江苏大学 
王新新 江苏大学 
朱浩 江苏大学 
中文摘要:针对打结嘴绕扣过程出现的缠绳故障问题,应用虚拟打结方法,分析夹绳盘搭绳点位置与打结嘴凸台倾角对绕扣与钳咬动作的影响,得出夹绳盘搭绳点偏差是打结嘴发生缠绳故障的主要因素,减小打结嘴凸台倾角有利于避免打结嘴缠绳故障。通过受力分析建立捆绳不沿打结嘴凸台曲面向上滑动的临界条件,获得改进的打结嘴凸台倾角。基于边界相似与B样条曲面造型方法重构打结嘴凸台曲面,获得改进的打结嘴模型。600次打结试验表明,凸台倾角50°的打结嘴模型具有更好限制捆绳沿打结嘴凸台曲面上滑的效果,能有效防止打结嘴缠绳故障发生,提高打结器的打结可靠性,可为打结嘴的改进设计提供参考。60°凸台倾角的打结嘴绕扣,夹绳盘搭绳点偏差应控制在±3°之内,而50°凸台倾角的打结嘴允许夹绳盘搭绳点偏差范围在[-4.5°,3°],可为夹绳盘搭绳点位置控制提供参考。
YIN Jianjun  JI Zheng  WANG Xinxin  ZHU Hao
Jiangsu University,Jiangsu University,Jiangsu University and Jiangsu University
Key Words:baler  knotter  knotter hook  failure analysis  improved design
Abstract:Aiming at the problems of rope-twining failure occurred in the process of ring-twining of the knotter hook, virtual knotting method was applied to analyze the influence of rope-lapping point position on the rope-griping plate and inclination angle of the boss on the knotter hook on ring-twining and rope-biting motion, which drew the conclusions that rope-lapping point position deviation was a main factor resulted in rope-twining failure of the knotter hook and decreasing inclination angle of the boss on the knotter hook was beneficial to avoid rope-twining failure of the knotter hook. The critical condition for the rope non-sliding upward along the boss curved surface on the knotter hook was established by force analysis, and inclination angle of the boss of the improved knotter hook was obtained. Based on boundary similarity and B-spline surface modeling method, the boss curved surface of knotter hook was reconstructed under CATIA software and the improved knotter hook model was obtained. Totally 600 knotting tests showed that the knotter hook model with 50° inclination angle of the boss had a better effect of restricting the rope to slide upward along the boss curved surface on the knotter hook, which can effectively prevent the rope-twining failure of the knotter hook. The knotter hook model with 50° inclination angle of the boss may improve the knotting reliability of the knotter, and provide a reference for the improved design of the knotter hook. To the ring-twining of the knotter hook with 60° inclination angle of the boss, rope-lapping point position deviation on the rope-griping plate should be controlled within ±3°. The knotter hook with 50° inclination angle of the boss allowed the rope-lapping point position deviation to range from -4.5° to 3°. They may provide a reference for the position control of rope-lapping point on the rope-griping plate.

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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