Design And Experiment Of Automatic Orderly Packaging System Of Leaf Vegetable Harvester

The mechanized and orderly harvesting of leafy vegetables includes the steps of dividing,cutting,transferring,collecting and transporting.The current researches on the leafy vegetable harvester focuses on the orderly harvesting and upward conveying.In these researches,the leafy vegetables being thrown discretely and laid out in disorder after the conveying,which impedes the process of orderly harvest of leafy vegetables.Therefore,order collection and packaging becomes the key to the orderly harvest of leafy vegetables.According to different mechanized harvest requirements of leafy vegetables,three different types of schemes of moving packing system,rotary bagging system and automatic baling system were proposed and designed.Besides,the simulated development and experiment were carried out for the scheme of rotary ordered bagging system in this study.The main research contents and work of this paper include the following aspects:(1)The existing harvesting and conveying system of leafy vegetable harvester and the growth environment of leafy vegetables were investigated,and the key problems such as space restriction,continuous bundling and automatic cooperative operation to realize automatic packaging operation on the harvester were summarized.According to different mechanized harvest requirements of leafy vegetables,three different types of schemes of moving packing system,rotary bagging system and automatic baling system were designed.(2)For leafy vegetables that need long distance transportation in the indirect market,this paper put forward the designs scheme of double rotary and orderly bagging system,and completed the specific parameter design and entity modeling.The interaction between leafy vegetable groups has a great influence on the ordering of the bagging system,the rigid-flexible coupling motion simulation of the double-rotation ordered bagging system and leaf vegetable was established.Based on the morphological characteristics of leek,a “flexible stem hinge rigid leaf” compound stem leaf model was proposed,and the simulation analysis of population rotation transportation was completed considering the friction contact resistance in the process of population operation of leek.Using the rigid flexible coupling model to optimize the bagging system,the optimal installation angle is 0 °,when the plant height is 400 mm,the optimal height of the rotating blade is 230 mm.(3)Based on the analysis of the functions of the rotary bagging system,the construction of control system and the modularized software was developed.In this paper,according to the timing analysis and speed matching of each action,the on-board rotary orderly bagging system was efficiently coordinated and optimized.The control strategy and detailed working process of the on-board rotary orderly bagging system were obtained,and the control procedure of the entire system was optimized.(4)Cooperating with the four-row clamping and conveying system,the on-machine rotary bagging performance test was carried out,which confirmed the feasibility of the scheme.The multi factor orthogonal test was carried out.The test data show that,the rotary speed has a great influence on the one-time operation time,and the shortest operation time is 2.1s;the installation angle has a great influence on the bagging weight.When the installation angle is about 30 °,the bagging weight is the most,that is,the loss during the harvesting process is less,but the order of the leafy vegetables is poor;When the conveying speed matches the rotation speed and the installation angle is 0 °,the bagging weight is moderate and the bagging order is good,which provides equipment solutions and technical support for the orderly harvesting of leafy vegetables.