非圆齿轮行星轮系蔬菜塞苗采苗机构反设计与试验

IF 2.2 2区 农林科学 Q2 AGRICULTURAL ENGINEERING
Zhifang Zhu, Guohuan Wu, Bingliang Ye, Yongchang Zhang
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引用次数: 0

摘要

在以往的研究中,采用不偏心圆齿轮和非圆齿轮的行星齿轮系蔬菜塞苗取苗机构存在两个不足。一是取苗深度不够,导致高转速下取苗成功率低;二是推苗角度较小,导致推苗效果差。因此,根据其运动轨迹对取苗机构进行了反设计。调整取苗段和推苗段的局部运动轨迹,得到取苗机构的理论运动轨迹。采用三次非均匀b样条曲线拟合调整后的轨迹。提出了一种新型的非圆齿轮行星齿轮系取苗机构,该机构包括3个组合非圆齿轮、4个非圆齿轮、1个行星载体和2个取苗臂。建立了机构的反设计模型。开发了机构分析设计软件,得到了满足设计要求的机构参数。建立了机构的虚拟样机,制作了机构的物理样机。通过该机构的虚拟运动仿真和高速摄影运动学台架试验,验证了该机构的运动学模型和反设计结果,研究了该机构原型的运动学性能。在实验室进行了该机构的采苗试验。摘苗成功率分别为94.2%、95.6%和90.2%,摘苗效率分别为60株、80株和100株/分/行。此外,由于推苗角度增大,推苗效果明显提高。通过改进设计的摘苗机构,在实际蔬菜插秧机中具有较高的应用价值
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Reverse design and tests of vegetable plug seedling pick-up mechanism of planetary gear train with non-circular gears
: In the previous research, the seedling pick-up mechanism of the planetary gear train with incomplete eccentric circular gear and non-circular gears for vegetable plug seedlings still has two shortcomings. One is that not enough seedling pick-up depth leads to a low success ratio of seedling pick-up at high rotation speeds, the other is that the smaller seedling pushing angle results in poor seedling pushing effect. Therefore, the reverse design of the seedling pick-up mechanism based on its motion trajectory was carried out. The local trajectory of seedling pick-up and seedling pushing sections was adjusted to obtain the theoretical motion trajectory of the seedling pick-up mechanism. The cubic non-uniform B-spline curve was used to fit the adjusted trajectory. A novel seedling pick-up mechanism of the planetary gear train with non-circular gears was proposed, including three combined non-circular gears, four non-circular gears, one planetary carrier, and two seedling pick-up arms. The reverse design model of the mechanism was established. The analysis and design software of the mechanism was developed to obtain the mechanism parameters meeting design requirements. The virtual prototype of the mechanism was established and its physical prototype was manufactured. Through the virtual motion simulation and high-speed photographic kinematics bench tests of the mechanism, the kinematic model and results of reverse design of the mechanism were verified, with the kinematic performances of the mechanism prototype studied. The seedling pick-up tests of the mechanism were conducted in the laboratory. The success ratios of seedling pick-up were 94.2%, 95.6% and 90.2% while the seedling pick-up efficiencies of the mechanism were 60, 80 and 100 plants per minute per row, respectively. Besides, the seedling pushing effect was improved mush because of the greater seedling pushing angle. The seedling pick-up mechanism through revise design is of high value to be applied in the practical vegetable plug seedling transplanters
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来源期刊
CiteScore
4.30
自引率
12.50%
发文量
88
审稿时长
24 weeks
期刊介绍: International Journal of Agricultural and Biological Engineering (IJABE, https://www.ijabe.org) is a peer reviewed open access international journal. IJABE, started in 2008, is a joint publication co-sponsored by US-based Association of Agricultural, Biological and Food Engineers (AOCABFE) and China-based Chinese Society of Agricultural Engineering (CSAE). The ISSN 1934-6344 and eISSN 1934-6352 numbers for both print and online IJABE have been registered in US. Now, Int. J. Agric. & Biol. Eng (IJABE) is published in both online and print version by Chinese Academy of Agricultural Engineering.
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