| At present,the harvesting of water celery in China mainly relies on manual labor,with high labor costs and high labor intensity,which leads to low economic benefits in planting and restricts the development of the water celery industry.In order to improve the harvesting efficiency of water celery and reduce its production costs,this article takes the study of the mechanical properties of three varieties of water celery as the research premise.Based on the research of stem cutting devices and methods at home and abroad,an overall design scheme is proposed,and a water celery cutting experimental platform is designed and developed,providing theoretical and technical support for the development of water celery harvesting equipment.The main work content and research results of this article are as follows:Through macroscopic and microscopic observation on the stem of water cress,Nantong small leaf water cress has a relatively large proportion of sclerenchyma in the cross section of the whole stem,many vascular bundles,and a small proportion of pith cavity in the cross section of the whole stem,which has good mechanical resistance.Firstly,the size and moisture content of the water celery stem were measured,and then tensile,compressive,shear,and bending mechanical tests were conducted to obtain the mechanical characteristics parameters of the water celery stem.The results showed that the strength indicators of Nantong Xiaoye water celery were greater than those of Yangzhou Jiejie celery and Changzhou Jintan water celery,with significant differences,making it more suitable for mechanized harvesting.Solve the dynamic problem of water celery stem cutting using the method of display dynamics analysis using ANSYS software.Analyze the cutting process of water celery stem,establish a finite element model of water celery stem cutting,set simulation conditions,and conduct simulation simulations of single stem cutting and multi stem cutting.The simulation results show that in the simulation of single stem cutting,when the moving blade translation speed is 4m/s,the maximum equivalent stress and the maximum equivalent stress at the root of water celery stem are the highest;In the simulation of multi stem cutting,when the blade forward speed is 0.5m/s and the moving blade translation speed is 4m/s,the maximum equivalent stress and the maximum equivalent stress at the root of the water celery stem are the highest,and the number of damaged roots is 0.A water celery cutting experimental platform and its components were designed in detail using Solidworks software,and key components were selected,calculated,and theoretically analyzed.A model of the mobile support frame was established using finite element simulation method,and the strength analysis of its support frame was conducted.On this basis,a water celery cutting experimental platform was developed.Using a single factor experimental method,the important factors affecting the harvest of water celery were explored,and three factors,namely the moving speed of the experimental platform,the rotating speed of the rotating drum,and the width of the rotating drum blade,were determined as orthogonal experimental variables with multiple factors.Using the response surface method to conduct water celery harvesting experiments,analyze the effects of platform movement speed,drum rotation speed,and drum blade width on cutting quality,harvesting process quality,and harvesting rate.The results show that when the experimental platform moves at a speed of 0.5m/s,the rotating speed of the drum is 43r/min,and the blade width of the drum is 150mm,the cutting quality is 92.5,and the harvesting rate is 91%.The quality of the harvesting p rocess is good. |
PDF Full Text Request