Study Of The Effect Of The Vibration Characteristics Of Hanging Cup Transplanter On The Soil In The Hole

The growing use of seedling transplanting technology has placed greater demands on the planting performance of the cup transplanter.During transplanting,complex excitation in the field(soil unevenness and surface conditions)and mechanical structures can cause the vibration of the transplanter,and the contact of the transplanter with the soil can intensify soil disturbance,affecting the planting depth of the cavity tray seedlings and reducing their survival rate at a later stage.Therefore,this thesis investigates the effect of transplanter vibration on hole parameters and soil particle movement based on theories such as vibration mechanics and the discrete unit method,combined with vibration testing techniques,soil tank tests and discrete element simulation.A mathematical model of transplanter-soil vibration characteristics was established based on the basic knowledge of dynamics and vibration mechanics.A multi-factor vibration test of the transplanter was carried out using the Labshop module of B&K software.It was found that the most significant factors affecting the vibration of the hanging cup transplanter were the forward speed of the transplanter and the firmness of the soil.The vibration acceleration increased with the forward speed;the vibration frequency was mainly between 1 and 12 Hz,and the vibration amplitude was 1.21 to 9.19 mm.The soil flow direction at the contact interface between the duckbill and the soil develops from point contact to surface contact,the contact area gradually increases,the soil disturbance area increases and the soil particles in contact with the duckbill are lifted,broken and broken under the influence of various forces,forming a hole,the soil flows back into the hole under the influence of various forces,causing the hole shape to change.Soil flume tests have shown that the greater the forward speed,the greater the intensity of the vibration,the greater the degree of soil fragmentation and reflux,the smaller the depth of the hole and the greater the longitudinal length of the hole opening.The EDEM simulation of the planters into holes shows that the range of soil particle disturbance increases with the frequency and amplitude of vibration.The applied vibration reduced the hole depth by a planting depth of 60 mm and a rotational speed of 18.2 r/min.It increased the hole opening length,with the hole depth increasing and then decreasing as the vibration amplitude increased.As the vibration amplitude increases from 0 mm to 12 mm,the longitudinal length of the hole increases with the vibration amplitude.The vibration increases the average velocity of the soil particles when the planters are opened to form the holes,with a maximum velocity of 0.0399 m/s at an amplitude of 12 mm;the more significant the vibration,the greater the average velocity of the soil particles when the planters leave the soil,and the effect of vibration amplitude on the average velocity of the soil particles is even more significant.