The Key Component Design And Research Of The Intelligent Control Precision Seeding For Wheat With Double Suction Cups Based On Hydraulic

At present,the demand for wheat production in our country is relatively large,and planting is still dominated by mechanization,and there are few practical machineries for intelligent control and precision planting.Aiming at the problems of small and irregular wheat seeds size and numerous problems such as broken ridges and lumpy seedlings in mechanical sowing,the previous experience and data of this study are used as reference,combined with relevant domestic and foreign data,and based on the current standards of domestic and foreign wheat precision planters.The planter is the core of the key research,based on the stability and rationality of the configuration,in-depth discussion of the current air-suction planter’s model and control and transmission power sources,and made its own design plan,which has been verified by the prototype test.The wheat precision seeder and its supporting system meet the wheat precision seeding standard and have good controllability,high intelligence,and better seeding performance.The specific work of this research includes:(1)Based on the research and data review of the previous two generations of suction wheat planters,the physical characteristics of wheat seeds such as thousand-grain weight and density were measured,and based on this,the hole characteristics and structural characteristics of the planter were studied.By improving the air duct,increasing the suction hole,and improving the hole type,using EDEM and FLUENT software combined with fluid mechanics,mechanical dynamics,theoretical mechanics,and other cross-disciplinary knowledge,respectively,the seeding and suction of the seeder were simulated by discrete element method.With finite element simulation,the three suction hole types and two seeder types were compared,analyzed and optimized.Finally,the-2.5k Pa straight air duct straight suction seeder design was selected.(2)A hydraulic control system is designed for the suction source fan of the seeder and the hydraulic motor of the rotation source of the suction disk,and combined with the speed feedback sensor,a set of real-time hydraulic-speed system model is established,and the system passes AMESim-Simulink Co-simulation combined with hydraulic transmission and microelectronics technology,designed and verified a BP-PID controlled electro-hydraulic proportional control model.Through this control model,the electro-hydraulic proportional control that can follow the tractor speed for self-adjustment can be realized.Seeding is precise,real-time and intelligent.(3)A feedback system is designed for the whole machine system and equipped with a human-computer interaction system,which can feedback and display important parameters such as the speed of precision seeding and faults in real time.The system was trial-produced through a prototype.Under the joint action of the system and the control system,the overall prototype meets the agronomic requirements for precise seeding of wheat,and the seeding variability is good.