The current automatic scallion-transplanting machine is a complicated mechanism composed of two linkage mechanisms and two band carriers. It delivers seedlings inefficiently because of the movement limitations of the linkage mechanism. This paper proposes a new high-order non-circular gear train for an automatic scallion-seedling feeding mechanism. The proposed gear train has an asymmetrical transmission ratio; i.e., its transmission ratio varies. This allows the mechanism's execution component to move in a long displacement and rotate in a large rotation angle. The long displacement enables the execution component to reach the designed working position, and the large rotation angle allows it to feed a scallion in the required pose. A mathematical model for calculating the asymmetrical transmission ratio was established according to the closure requirements and the full-cycle motion of the driven gear pitch curve. Then, the parameter-design model of the new seedling-feeding mechanism was established, based on precise pose points and trajectory-shape control points. Moreover, an aided-design program was developed to obtain the parameter-solution domain of the scallion-seedling feeding mechanism. The mechanism parameters, which met the seedling-feeding function, were optimized to determine the transmission ratio, using a program and a kinematic simulation. Finally, a prototype of the mechanism was produced, and a seedling-feeding experiment was carried out. One-thousand seedlings were tested at a rate of 100 seedlings per minute, and the statistical success rate was 93.4%. Thus, the automatic scallion-seedling feeding mechanism significantly improves the efficiency of automatically transplanting scallions.
Xiong Zhao
,
Jun Ye
,
Mengyan Chu
,
Li Dai
,
Jianneng Chen
. Automatic Scallion Seedling Feeding Mechanism with an Asymmetrical High-order Transmission Gear Train[J]. Chinese Journal of Mechanical Engineering, 2020
, 33(1)
: 10
-10
.
DOI: 10.1186/s10033-020-0432-9
The current automatic scallion-transplanting machine is a complicated mechanism composed of two linkage mechanisms and two band carriers. It delivers seedlings inefficiently because of the movement limitations of the linkage mechanism. This paper proposes a new high-order non-circular gear train for an automatic scallion-seedling feeding mechanism. The proposed gear train has an asymmetrical transmission ratio; i.e., its transmission ratio varies. This allows the mechanism's execution component to move in a long displacement and rotate in a large rotation angle. The long displacement enables the execution component to reach the designed working position, and the large rotation angle allows it to feed a scallion in the required pose. A mathematical model for calculating the asymmetrical transmission ratio was established according to the closure requirements and the full-cycle motion of the driven gear pitch curve. Then, the parameter-design model of the new seedling-feeding mechanism was established, based on precise pose points and trajectory-shape control points. Moreover, an aided-design program was developed to obtain the parameter-solution domain of the scallion-seedling feeding mechanism. The mechanism parameters, which met the seedling-feeding function, were optimized to determine the transmission ratio, using a program and a kinematic simulation. Finally, a prototype of the mechanism was produced, and a seedling-feeding experiment was carried out. One-thousand seedlings were tested at a rate of 100 seedlings per minute, and the statistical success rate was 93.4%. Thus, the automatic scallion-seedling feeding mechanism significantly improves the efficiency of automatically transplanting scallions.
[1] S Wang, C H Li, W Gao. Simulation and parametric analysis of vegetable seedling transplanting mechanism. Applied Mechanics and Materials, 2011(2): 4690-4694. (in Chinese)
[2] X Jin, X W Du, G S Gen, et al. Experiment on planting system of 2ZDJ-2 transplanter. Transactions of the Chinese Society for Agricultural Machinery, 2015, 46(12): 26-31. (in Chinese)
[3] L Xin, Z J LV, W Q Wang, et al. Optimal design and development of a double-crank potted rice seedling transplanting mechanism. Transactions of the ASABE, 2017, 60(1): 31-40.
[4] Y Zhao, H X Zhu, L Xin, et al. Mechanism analysis and experiment of transplanting mechanism with fitting gear five-bar for rice pot seedling. Transactions of the Chinese Society for Agricultural Engineering, 2016(1): 12-21. (in Chinese)
[5] X Jin, K X Zhao, J T Ji, et al. Design and implementation of intelligent transplanting system based on photoelectric sensor and PLC. Future Generation Computer Systems, 2018, 88: 127-139.
[6] Azhar lqbal Muftik, Abdul Shakoor Khan. Performance evaluation of yanmar paddy transplanter in Pakistan. AMA, 1995, 26(1): 31-36, 40.
[7] W C Choi, D C Kim, I H Ryu, et al. Development of a seedling pick-up device for vegetable transplanters. Transactions of the ASAE, 2002, 45(l) : 13-19.
[8] H Li, W B Cao, S F Li, et al. Development of 2ZXM-2 automatic plastic film mulching plug seedling transplanter for vegetable. Transactions of the Chinese Society of Agricultural Engineering, 2017, 33(15): 23-33. (in Chinese)
[9] J T Ji, L H Yang, X Jin, et al. Design and parameter optimization of planetary gear-train slip type pot seedling planting mechanism. Transactions of the Chinese Society of Agricultural Engineering, 2018, 34(18): 83-92. (in Chinese)
[10] X X Yu, Y Zhao, B C Chen, et al. Current situation and prospect of transplanter. Transactions of the Chinese Society for Agricultural Machinery, 2014, 48(8): 44-53. (in Chinese)
[11] M L Zhou, L Sun, X Q Du, et al. Optimal design and experiment of rice pot seedling transplanting mechanism with planetary Bezier gears. Transactions of the ASABE, 2014, 57(6): 1537-1548.
[12] G Li, K Y Ying, J Z Zhang, et al. Computation method of non-circular gear based on seedling needle tip point's static trajectory in transplanting mechanism. Journal of Mechanical Engineering, 2016, 52(1): 64-71. (in Chinese)
[13] X Zhao, J N Chen, Y Wang, et al. Reverse design and analysis of rice seedling transplanter with D-shape static trajectory. Transactions of the Chinese Society of Agricultural Engineering, 2012, 28(8): 92-97. (in Chinese)
[14] X Zhao, H Y Cui, L Dai, et al. Kinematic analysis and experimental research on the seedling pick-up mechanism of a second order free noncircular planetary system. Applied Engineering in Agriculture, 2017, 32(2): 169-179.
[15] G H Yu, T F Yu, B L Ye, et al. Research on a new planetary gear train mechanism. Journal of Mechanical Engineering, 2013, 49(15): 55-61. (in Chinese)
[16] G H Yu, T F Yu, B L Ye, et al. Design of a rotary plug seedling pick-up mechanism. Journal of Mechanical Engineering, 2015, 51(7): 67-76. (in Chinese)
[17] B L Ye, W M Yi, G H Yu, et al. Buffer Device of transplanting mechanism for plug seedlings based on transmission with incomplete non-circular gears. Transactions of the Chinese Society for Agricultural Machinery, 2017, 48(3): 69-75. (in Chinese)
[18] B L Ye, G H Wu, G H Yu, et al. Optimized design and test on rice potted seedling transplanting mechanism of planetary gear train with non-circular gear. Transactions of the Chinese Society for Agricultural Machinery, 2016, 47(11): 67-73. (in Chinese)
[19] L Sun, X Chen, C Y Wu, et al. Synthesis and design of rice pot seedling transplanting mechanism based on labeled graph theory. Computers & Electronics in Agriculture, 2017, 143: 249-261.
[20] X Zhao, C Wang, M X Yang, et al. Reverse design and analysis of automatic seedling pick-up mechanism with non-circular gear planetary train. Transactions of the Chinese Society of Agricultural Engineering, 2015, 31(16): 30-36. (in Chinese)
[21] J H Tong, Q Q Tang, C Y Wu, et al. Elliptical-circular planetary gear train box-taking mechanism design and trajectory analysis for automatic cartoning machines. Journal of Mechanical Engineering, 2018, 54(11): 172-179. (in Chinese)
[22] C Lin, H Gong, Y J Hou, et al. Design method of eccentric-high order elliptical bevel gear pair and analysis of its transmission characteristics. Transactions of the Chinese Society for Agricultural Machinery, 2011, 42(11): 214-221. (in Chinese)
[23] C Lin, Y J Hou, H Gong. Design and analysis of transmission mode for high-order deformed elliptic bevel gears. Journal of Mechanical Engineering, 2011, 47(13): 131-139. (in Chinese)
[24] G H Xu, W Liu, R S Xie. Design and experiment of six-blade differential pump driven by denatured higher order ratio Fourier non-circular gear pairs. Transactions of the Chinese Society for Agricultural Machinery, 2019, 50(2): 384-392. (in Chinese)
[25] T Yang, J Y Han. Solution region synthesis method of planar one-DOF six-bar linkages for specifying 4-positions of a 3R open chain. Journal of Mechanical Science & Technology, 2016, 30(7): 3069-3077.
[26] J Y Han, G Z Cui. Solution region synthesis methodology of spatial 5-SS linkages for six given positions. Journal of Mechanisms & Robotics, 2017, 9(4): 044501.
[27] X Zhao, M Y Chu, X X Mahim, et al. Research on design method of non-circular planetary gear train transplanting mechanism based on precise poses and trajectory optimization. Advances in Mechanical Engineering, 2018, 10(12): 1-12.
