Optimization Design And Experiments Of Automatic Transplanting Mechanism For Vegetable Pot-Seedling

Vegetable seedling transplanting can reduce the impact of natural disasters,improve the utilization rate of sunlight and water,short the growth cycle.The automatic vegetable transplanting can improve the work efficiency,reduce the working intensity,and achieve the purpose of saving labor and cost.Transplanting mechanism is one of the core components of automatic vegetable pot-seedling transplanting.And it is mainly composed of seedling pick-up mechanism and seedling planting mechanism.And the transmission allows the two mechanisms to meet a certain transmission relationship.The transplanting mechanism performance directly affects the planting quality and survival rate of vegetables.The main contents of this paper are as follows:1)Combined with the domestic and international research status of the existing automatic vegetable pot-seedling transplanting mechanism,the specific scheme of transplanting mechanism has been determined,the working characteristics and performance requirements of transplanting mechanism has been analyzed.The seedling pick-up mechanism of a kind of non-circular gear planetary gear train has been presented;a type of rotary seedling planting mechanism also has been optimally designed.2)According to the work requirements of seedling pick-up mechanism,the conjugate concave-convex and Fourier planetary gear train has been determined.It can output two unequal transmission ratio.The kinematic model has been established,and based on the MATLAB software,developed a human-computer interaction assisted analysis and optimization software for seedling pick-up mechanism.The parameters' effects on the trajectory and attitude have been analyzed,and a set of relatively optimal parameters have been optimized based on agronomic requirements.The angle of seedling pick-up is 135.2 degrees,the depth of seedling is 34.7mm,and the angle of seedling push-off is 120.2 degrees.3)A new tooth profile generation method has been proposed based on the conjugate concave-convex gear transmission mechanism.Envelope generates non-circular gear tooth profiles by using the Pro/E software.This method is applicable to all kinds of non-circular gears,and also has some versatility.At the same time,the structural design of seedling pick-up mechanism has been completed based on the optimized parameters.4)According to the shortcomings of existing rotary seedling planting mechanism in the experiment,its parameters have been optimally designed based on Visual Basic software.The seedling catching angle is 88 degrees,the seedling planting angle is 85 degrees and the depth of planting is 50 mm.At the same time,the structural design of seedling planting mechanism and transmission has been completed.5)Based on the Solidworks software,the 3D modeling and virtual assembly of seedling pick-up mechanism,seedling planting mechanism and transmission.Using ADAMS software,the joint simulation test of seedling pick-up mechanism and seedling planting mechanism has been completed.Analyze and compare the trajectory and velocity curves of the tip of the seedling claw and find that the data was almost the same.They verified the correctness and feasibility of the design for vegetable pot-seedling transplanting mechanism.6)The seedling pick-up mechanism and seedling planting mechanism have been processed and tested.The kinematic characteristics of the seedling pick-up mechanism and seedling planting mechanism have been analyzed.The field experiment of seedling planting mechanism has completed,the feasibility of the transplanting mechanism has been further verified.