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Design and experiment of ϕ-type-knots knotters on Chinese small square balers

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Abstract

Since the knotters on the Chinese rectangular balers are imported from outside of the country, Chinese knotters with independent intellectual property rights is far away from being closed. In order to harvest a large quantity of straw in a short period on the small-scale lands of China, basic requirements on the knotters are summarized. Mathematical model of the knotter is also determined uniquely. Furthermore, the ϕ-type-knots knotter equipped on the Chinese square baler to form the ϕ type knots is designed. Knotting rate experiments of the ϕ-type-knots knotter on the test bench and in the wheat/maize straws covered fields are carried out to check the knotting performances of the knotter. The parameters of the formed knots are also tested. The experiments results show that the knotting rate of the ϕ-type-knots knotter reaches 100.0% on the test bench without straws, while reaches 99.6% in the wheat straws covered field and 100.0% in the maize straws covered field. The average maximum force in the knotting process is 194.7 N in the lab experiment. The length out of the knots formed in lab is 15.9%–20.6% lower than the knots formed in the field experiment. The breaking force of the knots formed in the field is 115.9%–167.2% higher than the knots formed in lab due to the higher preload and interactions with the compacted bales. Highly relevant relationships exist between the breaking force of the formed knots and the maximum force in the forming process of the knots in the lab experiment. The designed knotter breaks out the embarrassing situation of the domestic knotters which don’t have independent intellectual property rights, and promotes the development of Chinese knotter technology, and the mathematical model is helpful for designing new type of knotters.

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Authors and Affiliations

  1. Beijing Key Laboratory of Optimized Design for Modern Agricultural Equipment, College of Engineering, China Agricultural University, Beijing, 100083, China

    Hui Li, Jin He, Qingjie Wang, Hongwen Li & Xiangcai Zhang

  2. Agricultural Engineering Division, Nepal Agricultural Research Council, Lalitpur, Kathmandu, Nepal

    Rabi Gautam Rasaily

  3. Henan Hao Feng Machinery Manufacturing Co., Ltd., Henan, 461103, China

    Rabi Gautam Rasaily & Qingchun Cao

Authors
  1. Hui Li
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  2. Jin He
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  3. Qingjie Wang
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  4. Hongwen Li
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  5. Rabi Gautam Rasaily
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  6. Qingchun Cao
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  7. Xiangcai Zhang
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Corresponding author

Correspondence to Jin He.

Additional information

This project is supported by Program for Changjiang Scholars and Innovative Research Team in University of China (Grant No. IRT13039) National Natural Science Foundation of China (Grant No. 51175499), Beijing Municipal Natural Science Foundation of China (Grant No. 6112015), and Chinese Universities Scientific Fund (Grant No. 2012YJ091)

LI Hui, born in 1984, has received her PhD degree from Beijing Key Laboratory of Optimized Design for Modern Agricultural Equipment, College of Engineering, China Agricultural University, China, in 2013. Her research interests include square baler design and conservation tillage systems.

HE Jin, born in 1979, is currently an associated professor at Beijing Key Laboratory of Optimized Design for Modern Agricultural Equipment, College of Engineering, China Agricultural University, China. He received his PhD degree from China Agricultural University in 2007.

WANG Qingjie, born in 1979, is currently a lecturer at Beijing Key Laboratory of Optimized Design for Modern Agricultural Equipment, College of Engineering, China Agricultural University, China. He received his PhD degree from China Agricultural Universtiy, in 2009.

LI Hongwen, born in 1968, is currently a professor at Beijing Key Laboratory of Optimized Design for Modern Agricultural Equipment, College of Engineering, China Agricultural University, China.

RASAILY Rabi Gautam, born in 1975, has received his PhD degree from China Agricultural Universtiy, China, in 2012. His research interest is conservation tillage equipments and works at Henan Hao Feng Machinery Manufacturing Co., Ltd. and Agricultural Engineering Division, Nepal Agricultural Research Council, Nepal.

CAO Qingchun, born in 1964, is currently an engineer at Henan Hao Feng Machinery Manufacturing Co., Ltd., China.

ZHANG Xiangcai, born in 1987, is currently a master candidate at Beijing Key Laboratory of Optimized Design for Modern Agricultural Equipment, College of Engineering, China Agricultural University, China.

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Li, H., He, J., Wang, Q. et al. Design and experiment of ϕ-type-knots knotters on Chinese small square balers. Chin. J. Mech. Eng. 27, 154–164 (2014). https://doi.org/10.3901/CJME.2014.01.154

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  • DOI: https://doi.org/10.3901/CJME.2014.01.154

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