熊亚,李海涛,陈龙健,张绍英,魏文军,韩鲁佳.打结器割绳脱扣机构与绕绳机构作用分析与改进设计[J].农业机械学报,2016,47(10):44-50,27.
Xiong Ya,Li Haitao,Chen Longjian,Zhang Shaoying,Wei Wenjun,Han Lujia.Analysis and Modification of Interaction between Wiper Mechanism and Billhook Mechanism for Knotter[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(10):44-50,27.
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打结器割绳脱扣机构与绕绳机构作用分析与改进设计   [下载全文]
Analysis and Modification of Interaction between Wiper Mechanism and Billhook Mechanism for Knotter   [Download Pdf][in English]
投稿时间:2016-05-26  
DOI:10.6041/j.issn.1000-1298.2016.10.006
中文关键词:  打结器  割绳脱扣机构  绕绳机构  相互作用分析  改进设计  仿真
基金项目:长江学者和创新团队发展计划项目(IRT1293)
作者单位
熊亚 中国农业大学 
李海涛 中国农业大学 
陈龙健 中国农业大学 
张绍英 中国农业大学 
魏文军 中国农业大学 
韩鲁佳 中国农业大学 
中文摘要:针对打结器脱扣失效和刚性碰撞的问题,分析割绳脱扣机构与绕绳机构的相互作用机理,仿真刀臂的受力—形变,得到刀臂沿打结嘴轴方向的刚度为801.05N/mm,脱扣凹槽与打结嘴的过盈量合理设计范围应为[0.38mm, 0.59mm];同时得到最大正压力下割刀在刀臂变形后与Oxy、Oxz和Oyz平面夹角变化分别为0.659°、0.4759°和0.4555°,这为割刀安装补偿量提供数据支持;依据刚—柔碰撞原理,设计一种弹性化打结嘴轴系,仿真得到该轴系使脱扣凹槽—打结嘴首次接触力在脱扣和回程阶段分别比原轴系减小46.3%和83.9%,因此该方案可减轻碰撞,同时具备提升脱扣率的优点,最后成功试制样品,实际打捆试验证明了该方案的可行性。
Xiong Ya  Li Haitao  Chen Longjian  Zhang Shaoying  Wei Wenjun  Han Lujia
China Agricultural University,China Agricultural University,China Agricultural University,China Agricultural University,China Agricultural University and China Agricultural University
Key Words:knotter  wiper mechanism  billhook mechanism  interaction analysis  modification design  simulation
Abstract:The purpose of this paper was to study and modify the interaction between wiper mechanism and billhook mechanism to solve wiping failure and rigid impact problems. Firstly, load-deformation of wiper was simulated. The results indicated that the stiffness of wiper along billhook shaft direction is 801.05N/mm and the interference between wiper and billhook should be in the range from 0.38mm to 0.59mm. Furthermore, under the maximum pressure, the angles of knife that was mounted on wiper, were changed with Oxy plane, Oxz plane and Oyz plane, which were 0.659°, 0.4759° and 0.4555°, respectively, so it gives a data support for knife installing compensation. Based on rigid-flexible collision theory, a new improved design with elastic billhook shaft system was introduced. The new design used a compression spring that enables the billhook to move elastically and slightly along the shaft direction. Meanwhile, the new billhook system would not affect billhook bevel gear’s movement, since the spring keeps the gear on its original position continuously. Simulation results demonstrated that the design could reduce initial contact force between wiper and billhook by 46.3% and 83.9% at wiping and return phases, respectively. Therefore, the design can decrease impact, and it has a theoretical advantage of increasing knotting rate. Finally, a prototype of the design was produced and its feasibility was verified by actual baling experiments.

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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