Design And Simulation Of Pickup Mechanism Of The Peanut Combine Harvester

Aiming at the problems of missing pods,large damage to peanut drop and pods,excessive power consumption and large vibration of elastic-tooh caused by congestion and stalling,etc.,a telescopic pick-up mechanism suitable for 4HL-6A peanut combine harvester was designed,and the key components were simulated and analyzed,and the prototype performance test was carried out.The main research contents are as follows:(1)The research status of pickup device at home and abroad was analyzes,and there were problems such as leakage of pods,peanut drop and loss of pods,entanglement of seedlings,congestion jamming,and violent vibration of elastic-tooh in pickup mechanism.The future development trend of pickup device was expounded,and the main research content and technical route were given.(2)The overall structure and working principle of 4HL-6A peanut combine harvester were analyzed.The overall structure design of the picking mechanism was carried out,and the design scheme of the picking roller,pressure feeding device,feeding device and other components was selected,and the parameters such as the size of the picking roller and the roller speed were determined.The radius of the pressure conveying device was designed to be 150 mm,and the speed was 0.95r/s≤n≤1.75r/s.(3)Detailed design of key components such as elastic-tooh,roller,cranks of the pickup mechanism.The structure of the elastic tooth,forces were analyzed,and the material,quantity and distribution of the elastic-tooth were determined.The structural analysis of the pick-up drum was carried out,and the roller length was designed to be3600 mm,and the center distance between the two holes of the crankshaft was 65 mm.(4)With Solid Works software to model the peanuts,peanut seedlings and pickup mechanisms.The kinematic simulation analysis of the picking mechanism was carried out by ADAMS software.Through six sets of simulation experiments,the optimal ratio of the forward speed of the unit and the rotation speed of the elastic-tooth was determined,and the motion trajectory of the elastic-tooth was a cocycloid and the formation of a rebate was a necessary condition for the normal operation of the pickup mechanism.(5)The pickup mechanism was simplified and a peanut vine model was established.EDEM software is used to simulate the collision of peanut seedlings,peanuts and bullet teeth.Three sets of simulation experiments were carried out to find out the pickup rate under different pickup speed ratios.When the pickup speed is greater than 1m/s,the pickup rate of the pickup mechanism is the highest.In the event of a collision,the peanut and peanut vines will break,thus reducing the picking rate.(6)The field test of 4HL-6A peanut combine harvester was carried out to obtain the pickup rate of the peanut combine harvester.The results of field experiments show that the pick-up rate index is better than the industry standard.