基于钵苗力学特性取投苗装置动力学分析与试验

doi:10.13229/j.cnki.jdxbgxb.20220139

Abstract

Abstract:

Seedlings transplanting， a critical process of vegetable production， can be mechanized to reduce labor intensity， improve production efficiency and ensure work quality. The process of taking and dropping seedlings is an extremely important link in vegetable transplanting. In view of the problems of existing automatic seedling picking and throwing device， such as complex structure and severely damaging to roots system， a kind of picking and dropping mechanism with a stem clipping type was proposed and analyzed for vegetable plug seedling. The mechanism was consisted of a seedling clamping mechanism，a lifting mechanism and a shift mechanism. Herein， a kinematics model of plug seedling in the process of seedling picking and throwing was established. Based on the mechanical property test of plug seedlings and the mechanical analysis of seedling clamping process， the clamping height of the stalks at different distances from the center of the plug seedling was determined. In order to study the influence of different picking and throwing frequency on the effect of seedling throwing， the kinetic analysis of the process of picking and throwing seedlings was carried out， and then we obtained the motion force equation between the pot seedlings and the seedling clip during the picking and throwing process， and thus the spacing of seedling clamp and the height of seedling throwing were determined. A trial was conducted by using chili seedlings with an average seedling height of 152.24 mm. Here， the success rate of seedling taking and dropping， the broken rate of substrates， and the damage rate of seedling were set as evaluation indicators. The experimental results showed that the best efficiency was obtained when the picking and dropping frequency was 90 plant/min， meanwhile， the success rate of picking seedlings and casting seedlings， the broken rate of substrates， the damage rate of seedling were 96.8%， 96.8%， 4.0%， and 1.6%， respectively. The acceptable results indicated that this finding has potential to provide sound technical support to improve the automation level of a plug-seedling transplanter in agricultural production.

Key words: agricultural engineering, automatic transplanting machine, seedling taking and throwing device, kinetic analysis

CLC Number:

S223.92

Shou-yong XIE,Xiao-liang ZHANG,Fan-yi LIU,Jun LIU,Xiao-liang YUAN,Wei LIU,Peng WANG. Kinetic analysis and experiment of seedling taking and throwing device based on mechanical properties of plug seedlings[J].Journal of Jilin University(Engineering and Technology Edition), 2023, 53(11): 3293-3304.

Figures/Tables 15

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形态特性参数	数值	均值
钵苗苗高/mm	141.42~164.32	152.24
钵苗茎粗/mm	1.61~2.32	2.06
叶面展幅/mm	45.62~90.17	68.42
钵苗质量/g	12.37~14.21	13.32
第一基节距钵体高度/mm	33.11~44.72	39.04
第二基节距钵体高度/mm	58.49~79.27	66.97
钵体上边长/mm	28.31~30.25	29.21
钵体下边长/mm	12.14~14.14	13.32
钵体高度/mm	36.42~39.36	37.45

取投苗频率/（株·min^-1）	升降电机转速/（r·min^-1）	夹苗电机转速/（r·min^-1）	输苗电机转速/（r·min^-1）
60	360	100	20
90	500	240	30
120	600	420	40

Kinetic analysis and experiment of seedling taking and throwing device based on mechanical properties of plug seedlings

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