Kinematic Analysis and Test on Transplanting Mechanism with Effective Zero-speed Transplanting on Mulch Film

Liu, Jiaodi

doi:10.3901/jme.2017.07.076

Cited by 18 publications

(17 citation statements)

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“…Its size is the key factor to determine the damage rate of nutritive bowl and the success rate of seedling picking. Most of the existing seedling picking mechanisms adopt pure mechanical clamping mode, lacking the perception and detection of the clamping force [1][2][3][4][5] . There are some problems in the seedling picking operation, such as loose bowl, nutritive bowl damage and planting leakage caused by too large or too small clamping force, which affect the survival rate and success rate of transplanting, resulting in the decline of transplanting quality and crop yield [6][7][8][9] .…”

Section: Introductionmentioning

confidence: 99%

“…(5), the sensitivities of the designed sensor under sine and square wave shocks with frequencies of 0.75 Hz, 1 Hz and 1.25 Hz are 0.4996 V/N, 0.5105 V/N, 0.5287 V/N, 0.5492 V/N, 0.5309 V/N and 0.5396 V/N respectively, with an average sensitivity of 0.5264 V/N. (3) Linearity of sensor The linearity of the sensor is an important index to describe its waiting characteristic, also known as non-linear error.…”

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confidence: 99%

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Development of a PVDF sensor for potted seedling clamping force of vegetable transplanting

Ji¹,

Sun²,

Jin³

et al. 2019

International Journal of Agricultural and Biological Engineering

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Aiming at the problems of loose bowl, nutritive bowl damage and planting leakage caused by lack of perception and detection of seedling clamping force in vegetable transplanting, a semi-micro-column structure sensor for measuring potted seedling clamping force was developed based on polyvinylidene fluoride (PVDF) piezoelectric film. The diameter of the semi-micro-column is 4 mm. The size of the force probe is 14 mm×30 mm, the encapsulation position of the force probe is 25 mm away from the tip of the seedling claw. The hardware circuit for sensor signal acquisition including pre-amplification module, power frequency notch module, low-pass filter module, processor module and power module was designed. The circuit completes charge-voltage conversion, clamping force signal amplification, power frequency signal elimination, vibration and noise elimination, and ensures the accurate acquisition of clamping force signal. In order to verify the sensor performance, sensor calibration tests and indoor experiments were carried out respectively. The calibration tests showed that the sensitivity of the clamping force sensor was 0.5264 V/N, the linearity was 4.74%, the accuracy was 6.51%, the hysteresis was 3.63%, and the range was 8 N under the impact of different waveforms and frequencies, which fully meet the accuracy requirements of the clamping force detection during transplanting. Indoor experiments showed that the clamping force sensor had good stability and adaptability under different seedling frequencies. The sensor can provide useful reference for the perception and detection of seedling clamping force and the feedback regulation of seedling clamping force.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Development of a PVDF sensor for potted seedling clamping force of vegetable transplanting

Ji¹,

Sun²,

Jin³

et al. 2019

International Journal of Agricultural and Biological Engineering

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show abstract

“…However, the structure of the potted flower seedling transplanting mechanism with mechatronics technology is complicated, expensive, and not easy to localize [3][4][5][6] . As a recent development of flowerpot transplantation in China, many attempts have been made to improve the transplanting mechanism [7][8][9][10] . However, there are few studies regarding the transplanting mechanism for potted flowers.…”

Section: Introduction mentioning

confidence: 99%

Optimized design and experiments of a rotary-extensive-type flowerpot seedling transplanting mechanism

Yin

Wang

Zhang³

et al. 2019

International Journal of Agricultural and Biological Engineering

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To realize the mechanization of flowerpot seedling transplanting, a creative mechanism to transplant flowerpot seedlings was designed. The mechanism is based on noncircular gear in combination with a transplanting arm equipped with an extensive seedling pickup device to transplant the flowerpot seedlings from the growing tray to the flowerpot, which in accordance with the transplanting agronomy requirements. The working principles of a theoretical model and kinematic characteristics of the transplanting mechanism were analyzed. The computer-aided analysis and optimization software based on Visual Basic 6.0 was developed and used to obtain a set of special trajectory and attitude parameters satisfying the transplanting operation requirements. The optimized parameters were used for virtual manufacturing and simulation testing of the transplanting mechanism. The virtual prototype testing results are consistent with the theoretical analysis, verifying the structural design validity and rationality. The high-speed photography was used in a bench test of the transplanting mechanism with "Salvia Splendens" pot seedlings as test samples. The trajectory and attitudes of the theoretical analysis, virtual test, and physical prototype test were essentially identical. The bench test results showed that the success rate was 91.67% for the seedling pickup device penetrating into the root mass at 35 mm, thus, the quality of the extracting seedling was satisfactory.

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“…The planetary gear train mechanism has many advantages: simple structure, low cost, high efficiency, smooth transmission, and the strongest competiveness. 7,8 Many scholars had researched on the design method of planetary gear transplanting mechanism. Zhou Maile used Bezier curve fitting technology to design the non-circular gear pitch curves.…”

Section: Introductionmentioning

confidence: 99%

Research on design method of non-circular planetary gear train transplanting mechanism based on precise poses and trajectory optimization

Zhao

Chu

et al. 2018

Advances in Mechanical Engineering

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Among all kinds of transplanting mechanisms which are the important parts of transplanters, the planetary gear train transplanting mechanism is widely used for its excellent transmission performance, but it is difficult to design the gear pitch curves and structural parameters according to the trajectory and pose requirements of transplanting. The current design method of the non-circular planetary gear train transplanting mechanism cannot ensure the precise position and posture in the crucial points of transplanting trajectory, nor take both the anticipated trajectory and the smoothness of the gear pitch curves into account, it will only get one solution which is available for mechanism design. In order to solve those problems, the non-circular planetary gear train transplanting mechanism is analyzed as a combination of the bargroup and gear train system. According to the transplanting requirements, three points with precise position and posture which called pose points in the trajectory are given to obtain the solution domain of the parameters of bar-group, and then trajectory shape control points are inlet to design the desired shape of the transplanting trajectory and obtain the transmission ratio curve which can be used to get the gear pitch curve. The most suitable parameters of bar-group in solution domain are selected based on the smoothness of the gear pitch curves. This article establishes threedimensional model of the mechanism and utilizes the ADAMS to carry out a motion simulation; all simulation results are consistent with theoretical design results, which confirm that the design method based on prescribed pose points and trajectory control points is adequate for the transplanting mechanism. With the proposed method, the selectivity of the mechanism's parameters solution is increased, and transmission performance benefits from the integrated design of trajectory control and the smoothness of the pitch curves.

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Kinematic Analysis and Test on Transplanting Mechanism with Effective Zero-speed Transplanting on Mulch Film

Cited by 18 publications

References 0 publications

Development of a PVDF sensor for potted seedling clamping force of vegetable transplanting

Development of a PVDF sensor for potted seedling clamping force of vegetable transplanting

Optimized design and experiments of a rotary-extensive-type flowerpot seedling transplanting mechanism

Research on design method of non-circular planetary gear train transplanting mechanism based on precise poses and trajectory optimization

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