Design And Experiment Of Tobacco Well Cellar Transplanting Device

Tobacco transplanting is an indispensable part of tobacco production,directly affecting the yield and quality of tobacco leaves,and providing a solid foundation for the sustainable development of agricultural economy.Aiming at the current situation of low efficiency and poor quality of tobacco well cellar transplanting devices,this paper studies and designs a tobacco well cellar transplanting device.The main work and research results are as follows:(1)Geometric and physical characteristics of tobacco bowl seedling and parameter calibration of tobacco field soil discrete element model during transplanting period.During the pot seedling transplanting period,the average height of tobacco seedlings was 151 mm,the average diameter was 3.88 mm,and the average water content was 88.6%;Conduct uniaxial closed compression tests and unconfined compressive strength tests on tobacco soil to determine the viscosity and plasticity indicators of the calibration test.Through screening tests and orthogonal tests,use the viscoplasticity indicators to determine the key parameters that affect the discrete element model of tobacco soil.The surface energy is 16.7J/m2,the plastic deformation ratio is 0.42,the recovery coefficient is 0.35,the rolling friction coefficient is 0.25,the bond branching index is 4.25,and the tangential stiffness factor is 0.5.(2)Design of key components of tobacco hole forming and transplanting device.Aiming at the problems of poor quality and low efficiency of the current well cellar transplanting device in the state of continuous drilling,a deformed elliptical gear parallelogram mechanism was designed,and a theoretical analysis model of the mechanism was established and its operating mechanism was described.The effects of the crank length,the eccentricity of the deformed elliptical gear,and the order of the deformed elliptical gear on the movement trajectory of the entire device were obtained;Aiming at the problem of poor hole forming quality of the hole forming machine,the working process of the hole forming machine is analyzed and a theoretical analysis model is established to determine the key parameters that affect the hole forming quality: diameter,pitch,and rotational speed of the hole forming machine;Aiming at the problem of easy collapse of the well cellar,a diversion hood is designed,through which water is evenly sprayed onto the inner wall of the well cellar to improve the compactness of the inner wall of the well cellar.(3)Simulation analysis of the movement trajectory and cavitation process of the device during operation.Based on the kinematics simulation software Adams,and according to the key design parameters that affect the motion trajectory of the deformed elliptical gear parallelogram mechanism determined previously,using the pit depth and verticality as evaluation indicators,the optimal parameter combinations for the tobacco pit forming and transplanting device were obtained through orthogonal experiments: the crank length of the parallelogram mechanism was 190.1 mm,the eccentricity of the deformed elliptical gear was0.5,and the order of the deformed elliptical gear was 1.3;Based on the discrete element simulation software EDEM,and based on the key parameters determined previously that affect the quality of the burrow,using the depth and diameter of the well cellar as evaluation indicators,the optimized parameter combinations of the burrow were obtained through orthogonal experiments and field performance tests: the diameter of the burrow was 100 mm,the pitch of the burrow was 75 mm,and the rotational speed of the burrow was 350r/min.(4)Prototype design and field test verification.Build a well cellar transplanter chassis to install a tobacco hole forming transplanter for field testing.Based on the optimization results of key component tests,the evaluation results of the hole depth,hole vertical angle,and other indicators meet the design requirements and meet the agronomic requirements of tobacco well cellar transplanting.