Dynamic Analysis And Optimum Design Of Picking Mechanism Of High-Density Round Baler

The high-density round bale baler plays a very important role in the collection of straw in agriculture,and the pick-up mechanism is one of the key components of the high-density round bale baler.The picking mechanism is mainly responsible for picking,lifting,and transporting straw in the field.The working performance of the picking mechanism directly affects the straw picking efficiency and the missed picking rate,and has a greater impact on straw collection.The picking mechanism of the domestic high-density round baler is mostly of the elastic-toothed drum type,and the changes of the relevant working parameters of the key components of the elastic tooth have a great influence on the picking effect.Therefore,the three-dimensional modeling of the high-density round baler is carried out,Research and work on dynamic simulation analysis and optimization settings,field test verification.The specific research contents are as follows:(1)According to the kinematics and dynamics analysis of the picking mechanism of the round baler.Through the use of kinematics-related methods to study and analyze the movement trajectory of the end of the spring teeth,the factor that affects the movement trajectory is the ratio of the linear speed of the end of the spring teeth to the forward speed of the baler is ?,and the analysis results show When the value range of ? is ?> 1,the pickup mechanism can be in a normal working state.(2)Based on the CATIA software,the picking mechanism model of the round baler is constructed and imported into the ADAMS software.The kinematics simulation analysis is carried out on the picking mechanism of the round baler.The analysis results show that the picking mechanism has a missing picking rate and the baler The forward speed is related to the rotation speed of the drum disc.With the increase of speed and rotation speed,the impact strength of the elastic teeth on the straw is increased,which is not conducive to picking up.The flexible modeling and simulation of the elastic teeth of the pick-up mechanism were carried out,and the stress conditions of the elastic tooth parts were observed.The results showed that the maximum stress on the tip of the elastic tooth during the working process of the mechanical pick-up mechanism was 922.493 N / {mm } ^ 2,the maximum value of shear force is 391.505 N / {mm} ^ 2,which is greater than the force on the rear end of the elastic tooth.(3)By establishing a coupling channel between ADAMS software and EDEM software,the pickup mechanism and EDEM are coupled and simulated,and the key components of the pickup mechanism are analyzed for speed and stress.The results show that the round baler When the advancing speed is constant,the higher the rotation speed of the drum disc,the speed value and angular speed value of the spring teeth tip of the pick-up mechanism will also increase,resulting in straw breakage,which is not conducive to picking up and will reduce the service life of the spring teeth.(4)Conduct a field test on the picking mechanism to explore the impact of the speed of the baler on the missed picking rate.When the speed of the machine is 6km / h,it can not only ensure the efficiency of the round baler,but also make The pick-up rate of the pick-up mechanism is at an optimal state.At the same time,the average baling time of a single bale is about 3min.The average working efficiency of the pick-up mechanism is 1.51 kg / s,which meets the agricultural standards.