Design and experimental study of ginkgo leaf picking device

Zhang, Shanwen; Wang, Zhongliu; Wang, Li; Liu, Sian; Zhang, Yanjun; Miao, Hong; Dai, Min; Liu, Sixing

doi:10.1177/09544062211023118

Cited by 3 publications

(4 citation statements)

References 8 publications

(5 reference statements)

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“…The sub-soiling shovel is a straight-pointed trenching shovel (Wang et al, 2016b). The main dimensions are shown in Table 1 (Ucgul et al, 2015;Zhang et al, 2021). Force analysis of the LFS is performed to determine the main parameters that influence its working performance.…”

Section: Structural Design Of Lfsmentioning

confidence: 99%

Design and Experiment of a Combined Type Spatially Layered Proportional Fertilization Device

Li,

Lin,

et al. 2023

Eng. Agríc.

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To solve the problems of low efficiency, poor fertilizer application, and low fertilizer utilization rate of existing wheat layered fertilization devices (LFD). This paper proposed a layered fertilization mode combining shallow fertilizer application based on rotary tillage and middle/deep fertilizer application of layered fertilizer shovel (LFS), and designed a combined spatial layered fertilization device with a fixed proportion. A discrete element simulation model consisting of soil, LFS and fertilizer was established. Taking the variation coefficients of fertilization amount as the evaluation indicator and changing the sidewall deflection angle, rear inclination angle, upper channel length of LFS, a three-factor three-level quadratic rotational orthogonal experiment was carried out. The optimal parameter combination was obtained: the deflection angle was 9.5°, the inclination angle was 57°, and the channel length was 280 mm. The corresponding variation coefficients of fertilizer application depth were 4.55%, 8.44%, and 6.93% while working stably under the optimal combination, which is consistent with the simulation results. The results showed that LFD can apply fertilizer underground in three layers: 0~10, 15, and 20 cm, with the proportion of shallow, middle, and deep fertilizers being 30%, 35%, and 35%, which can meet the agronomic requirements for winter wheat growth.

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Section: Structural Design Of Lfsmentioning

confidence: 99%

Design and Experiment of a Combined Type Spatially Layered Proportional Fertilization Device

Li,

Lin,

et al. 2023

Eng. Agríc.

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“…The formula (1) indicates that the roller speed and moving speed only affect the density of the motion track, as shown in Figure 5. The roller speed adjustment range is between 75 rev/min and 150 rev/min (Zhang et al, 2021), and the maximum speed of the designed walking platform is 0.5 m/s. Based on the formula (1), when the roller speed is 75 rev/min and the moving speed is 0.5 m/s, the distance of the composite curve x1x2 in a single blade removal tooth is the largest, at this time, x2-x1=400 mm.…”

Section: Picking Principle Of Picking Machinementioning

confidence: 99%

Design and experiment of brush-roller ginkgo leaf picker for the dwarf dense planting mode

Zhang,

Sun,

et al. 2023

J Agric Eng

Self Cite

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At present, ginkgo leave are still picked manually. A brush roller ginkgo leaf picker has been designed to improve harvesting efficiency and reduce losses caused by manual failure to pick leaves in time under large-scale planting areas. The ginkgo leaf picker is mainly composed of crawler chassis, gantry frame, brush roller picking parts, and collecting box. The kinematics of the brush roller is analyzed for the picking omission situation. An experimental platform for picking ginkgo biloba leaves was established. Three parameters, namely roller speed, moving speed, and roller inclination, were selected for optimization. Then the maximum net harvest rate and the minimum damage rate were achieved. The orthogonal test showed that when the roller speed was 130 rev/min, the moving speed was 0.25 m/s, and the roller inclination was 32°, the picking effect was the best, the net harvest rate was 93.32%, the damage rate was 1.42%, and the damage degree of the trunks was slight. The experiment proved that the brush-roller ginkgo leaf picker has a good picking effect, which can provide a reference for the optimization design of ginkgo leaf harvesting machinery under the dwarf dense planting mode.

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“…In recent years, China has developed harvesting equipment including hydraulic lifting platforms, vibratory seed harvesters, and robots for collecting forest tree cones (Wu and Dong 2011;Zhang et al 2021). However, the pinecone harvesting methods based on the design theory and methods of the key components of red pine cone harvesting are insufficient, as the extent of pinecone lignification is high, and their structural characteristics are complex.…”

Section: Introductionmentioning

confidence: 99%

“…The relationship between the pinecone size, pinecone moisture content, contact material, hardness, and the static friction and static coefficient of friction was examined using homemade slanting and texture gauges, taking the average value of each group of cyclic measurements 20 times. The experimental results were optimized to make a physical prototype, and its validity was demonstrated (Zhang et al 2021). This study provides a reference for the design of pinecone picking equipment as well as methods to determine the friction characteristics and parameters.…”

Section: Introductionmentioning

confidence: 99%

Frictional properties of red pine cones harvested under different conditions

Ren,

Teng,

Gao

et al. 2023

BioRes

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The climbing of trees to pick pinecones is a high-risk exercise. In this study, a mechanical gripper jaw was designed. Frictional characteristics between the pinecones and the mechanical gripper jaw during pinecone picking under different conditions were investigated using a workbench simulation, homemade inclined friction meter, and mass tester. Three-level orthogonal and one-factor tests were conducted. The relationship between the water content and friction properties and between the water content and hardness were investigated, and conclusions were drawn on how water content affected friction properties by influencing hardness. The results showed that the contact material greatly affected the friction properties. The pinecone water content was maintained between 24% and 28% to ensure that the coefficient of friction was maximized and that the pinecones were sufficiently hard to dislodge. Additionally, a prototype machine was used to perform pinecone-gripping experiments to validate the experimental and simulation results. Consequently, the results of this study provide a useful reference for the structural design of pinecone picking robots and the picking reason.

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Design and experimental study of ginkgo leaf picking device

Cited by 3 publications

References 8 publications

Design and Experiment of a Combined Type Spatially Layered Proportional Fertilization Device

Design and Experiment of a Combined Type Spatially Layered Proportional Fertilization Device

Design and experiment of brush-roller ginkgo leaf picker for the dwarf dense planting mode

Frictional properties of red pine cones harvested under different conditions

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