A novel planar motion generation method based on the synthesis of planetary gear train with noncircular gears

Ye, Jun; Zhao, Xiong; Wang, Ying; Sun, Xincheng; Chen, Jianneng; Xia, Xudong

doi:10.1007/s12206-019-0933-6

Cited by 9 publications

(2 citation statements)

References 24 publications

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“…Combined with the trajectory requirements of WPST and the monotonicity of the angular displacement of the transplanting arm (L b ) relative to the planet carrier (L a ), the optimized relative angular displacement curve and transplanting trajectory are obtained by adjusting the variable parameters of nine data points on the angular displacement curve, as shown in Figure 10. In accordance with the conversion relationship between the 2R mechanism and PGTM, the reciprocal of the slope value of the relative angular displacement curve is the value of the total transmission ratio of PGTM [24] ; the total transmission ratio curve can be solved, as shown in Figure 11.…”

Section: Replaying and Analyzing The Trajectories Of The Transplanting Mechanismmentioning

confidence: 99%

Design of clamping-pot-type planetary gear train transplanting mechanism for rice wide–narrow-row planting

Wang

Sun

Huang

et al. 2021

International Journal of Agricultural and Biological Engineering

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To design a clamping-pot-type wide-narrow-row pot seedling transplanting (WPST) mechanism with desired spatial beak-shaped trajectory and working posture, a new design method of planetary gear train transplanting mechanism (PGTM) with non-circular gears based on several key spatial poses (position and posture) was proposed. The PGTM was simplified to a spatial open-loop chain with two-revolute (2R) joints. The geometric constraint equations containing only the structural parameters of the chain were then established on the basis of the three key spatial poses, and the homotopy algorithm was used to obtain all the required parameters of the mechanism. In accordance with the parameters obtained, the relative angular displacement relation between the planet carrier and the transplanting arm was optimized, the trajectory of the mechanism was replayed, and the total transmission ratio was determined. The degree of freedom of the spatial 2R mechanism was reduced by attaching to the unequal gear pair, and the transmission ratio was distributed in accordance with the gear type to realize the design of a non-circular gear pitch curve. Lastly, a clamping-pot-type PGTM for rice WPST driven by the combination of planar non-circular and non-conical gears was designed, and virtual simulation and prototype test were conducted. Results showed that the simulation and prototype test trajectories were consistent with the desired trajectory. Under the operating speeds of 50 r/min and 90 r/min, the success rates of seedling picking were 95.32% and 90.15%, respectively, which verified the feasibility of the theoretical method. This method could provide a reference for the design of a spatial PGTM with nonuniform transmission.

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Section: Replaying and Analyzing The Trajectories Of The Transplanting Mechanismmentioning

confidence: 99%

Design of clamping-pot-type planetary gear train transplanting mechanism for rice wide–narrow-row planting

Wang

Sun

Huang

et al. 2021

International Journal of Agricultural and Biological Engineering

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“…As a result, non-circular gears are often combined with other mechanisms to achieve specific complex motion. Ye proposed a planetary gear train with non-circular gears to realize planar motion generation synthesis (Ye et al, 2019). Mundo combined non-circular gear pair with five-bar mechanism (Mundo et al, 2009), so that one of hinge points in the mechanism can move in a specific trajectory.…”

mentioning

confidence: 99%

Study on improving the winding forming uniformity of high-speed silk reeling machine with large package

Qingsong

Ying

ZHOU

et al. 2022

JAMDSM

Self Cite

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Silk reeling is to make the high-quality cocoons into silk package, mainly achieved by silk reeling machine (Wang et al., 2013) (Mande et al., 2013). In the process of silk reeling, the traverse mechanism is the actuator to wind the silk yarn and form a silk package. Its main components include rotary drum and traverse rod. Combined with the rotary motion of rotary drum and the linear reciprocating motion of traverse rod, silk yarn is winded on the rotary drum in the form of spiral. Gradually, the silk yarn on the rotary drum forms an alternately covered mesh surface and finally form a silk package (Zhao et al., 2014). The forming uniformity of silk package, which directly influences the quality of finished silk fabrics, is affected by axial and circumferential forming uniformity of traverse mechanism.In axial direction, the forming uniformity is achieved by controlling the traverse rod to guide silk yarn with constant speed for as long as possible. The traditional traverse mechanism uses eccentric circular gear pair to drive the multi-bar linkage to achieve it. However, the velocity of its traverse rod varies acutely at two ends, resulting in the phenomenon of packaged concave core (Yanabe et al., 2010). In addition, the gear backlash of the eccentric gear pair is great when they mesh, which makes the motion of traverse rod unstable (Mitome and Ishida, 1974). Compared with the eccentric circular gears, non-circular gears can not only realize variable speed drive, but also have the advantages of high motion accuracy, stable transmission, simple and compact structure. As a result, non-circular gears are often combined with other mechanisms to achieve specific complex motion. Ye proposed a planetary gear train with non-circular gears to realize planar motion generation synthesis (Ye et al., 2019). Mundo combined non-circular gear pair with five-bar mechanism (Mundo et al., 2009), so that one of hinge points in the mechanism can move in a specific trajectory. Ottaviano designed a new pulsating blood flow generator by combining non-circular gear with crank slider mechanism (Ottaviano et al., 2008), so that the slider can reciprocates according to the given motion law. In recent years, some scholars proposed to

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A novel approach for the rigid body guidance synthesis of planar RRPR linkages

et al. 2020

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A novel planar motion generation method based on the synthesis of planetary gear train with noncircular gears

Cited by 9 publications

References 24 publications

Design of clamping-pot-type planetary gear train transplanting mechanism for rice wide–narrow-row planting

Design of clamping-pot-type planetary gear train transplanting mechanism for rice wide–narrow-row planting

Study on improving the winding forming uniformity of high-speed silk reeling machine with large package

A novel approach for the rigid body guidance synthesis of planar RRPR linkages

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