Synthesis and design of rice pot seedling transplanting mechanism based on labeled graph theory

Sun, Liang; Chen, Xuan; Chen, Wu; Xu, Yunfeng

doi:10.1016/j.compag.2017.10.021

Cited by 20 publications

(15 citation statements)

References 9 publications

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“…According to the gear train configuration library for transplanting, the double-planet carrier gear train configuration 15 is selected as shown in Figure 10.…”

Section: Configuration Of the Transplanting Mechanism Of The Double-p...mentioning

confidence: 99%

“…To break through the configuration limitation and obtain a pot seedling transplanting mechanism that considers the ideal transplanting trajectory, attitude, and reasonable transmission characteristics, Sun 15,16 carried out a structural synthesis of the gear train mechanism and synthesis of double planet carrier gear train for rice pot seedlings. The double-planet carrier gear train configuration design of the transplanting mechanism achieves the ideal trajectory and attitude requirements, and the generated non-circular gear has good roundness.…”

Section: Introductionmentioning

confidence: 99%

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Kinematic synthesis and optimization design of a rice pot seedling transplanting mechanism

Wang

Miao³

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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To achieve the precise operation trajectory and posture required for pot seedling transplanting and solve the problem that the partial reversal of the transplanting arm’s output in the double planet carrier transplanting mechanism, which is unconducive to the realization of the seedling pushing action, a motion synthesis method for a double planet carrier gear train mechanism with attitude constraints based on the output angle and four exact task poses is proposed. First, the ideal transplanting trajectory is planned according to the transplanting agronomic requirements, and the position and attitude information of the four key points on the ideal trajectory are extracted as the constraints of the mechanism design. Then, based on the relative displacement equation, a comprehensive design equation of the motion of the plane 3R mechanism (simplified model of the transplanting mechanism) about the output rotation angle and the precise four pose constraints is established, and the mechanism parameters that meet the constraint requirements are obtained by solving the multicellular homotopy method. A mathematical model of the roundness of the non-circular gear was also established, and the roundness of the transmission non-circular gears in the gear-train transplanting mechanism was optimized by using the genetic algorithm. Finally, the structural design, virtual simulation, and experimental analysis of the double-planet carrier gear train transplanting mechanism were completed. The results show that the actual trajectory and attitude are consistent with the theoretical design, and when then the mechanism was under the transplanting efficiency of 120 and 180 plants/min, the success rates of picking seedlings were 91.53% and 87.46%, respectively, meeting the design requirements.

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“…According to the gear train configuration library for transplanting, the double-planet carrier gear train configuration 15 is selected as shown in Figure 10.…”

Section: Configuration Of the Transplanting Mechanism Of The Double-p...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Kinematic synthesis and optimization design of a rice pot seedling transplanting mechanism

Wang

Miao³

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

Self Cite

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show abstract

“…Many automatic transplanting systems have been developed for transplanting different kinds of potted seedlings (Han et al, 2018a,b;Rahul et al, 2019;Jin et al, 2020). The transplanting mechanism was designed and the theory of automatic transplanting was analyzed in literature (Sun et al, 2017;Vivek et al, 2017). A mini-automatic transplanting machine was developed, and the performance of its control system was investigated by Yang et al (2020).…”

Section: Introductionmentioning

confidence: 99%

A Framework for Identification of Healthy Potted Seedlings in Automatic Transplanting System Using Computer Vision

et al. 2021

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Automatic transplanting of seedlings is of great significance to vegetable cultivation factories. Accurate and efficient identification of healthy seedlings is the fundamental process of automatic transplanting. This study proposed a computer vision-based identification framework of healthy seedlings. Vegetable seedlings were planted in trays in the form of potted seedlings. Two-color index operators were proposed for image preprocessing of potted seedlings. An optimal thresholding method based on the genetic algorithm and the three-dimensional block-matching algorithm (BM3D) was developed to denoise and segment the image of potted seedlings. The leaf area of the potted seedling was measured by machine vision technology to detect the growing status and position information of the potted seedling. Therefore, a smart identification framework of healthy vegetable seedlings (SIHVS) was constructed to identify healthy potted seedlings. By comparing the identification accuracy of 273 potted seedlings images, the identification accuracy of the proposed method is 94.33%, which is higher than 89.37% obtained by the comparison method.

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“…Ye et al [17,18] studied the kinematics and dynamics of the transmission and applied the mechanism to transplanting rice and vegetable seedlings. Sun et al [19] synthesized the gear-train mechanism configuration and investigated a variety of available mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Automatic Scallion Seedling Feeding Mechanism with an Asymmetrical High-order Transmission Gear Train

Zhao

Chu

et al. 2020

Chin. J. Mech. Eng.

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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.

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Synthesis and design of rice pot seedling transplanting mechanism based on labeled graph theory

Cited by 20 publications

References 9 publications

Kinematic synthesis and optimization design of a rice pot seedling transplanting mechanism

Kinematic synthesis and optimization design of a rice pot seedling transplanting mechanism

A Framework for Identification of Healthy Potted Seedlings in Automatic Transplanting System Using Computer Vision

Automatic Scallion Seedling Feeding Mechanism with an Asymmetrical High-order Transmission Gear Train

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