Design And Optimization Of Picking And Cutting Device For High-density And Large Square Straw Bale Harvester

At present,most of the animal husbandry in China is concentrated in operation,with large straw area.The round baler and small square baler are no longer suitable for market demand.Based on the research at home and abroad,this paper uses a combination of theoretical analysis,statics and dynamics simulation to provide a design basis for the picking and cutting system of the high-density and large square straw bale harvester,and finally developed a the picking and cutting system of the high-density and large square straw bale harvester with pre-cutting function is required.The main research contents and achievements of this paper are as follows:(1)According to the current development of animal husbandry and the use of baler,the advantages and necessity of developing the high-density and large square straw bale harvester are discussed.Through the research on the picking and cutting system of the baler,it is clarified that the system has the importance of the pre-cutting device.(2)Bring forward the mechanical design ideas and assembly plan of the picking and cutting system,using Solid works software to establish a three-dimensional model of the picking and cutting system,design and calculate the main components of the picking and rotating cutting feeder structure size and rotation speed Design parameters of components.The motor and the pick-up device are connected by a side chain drive,and a reversing mechanism is provided in the drive device of the motor and the pick-up device.The motor and the rotary cutting and feeding device are connected by a side V-belt drive.(3)ANSYS software was used to perform static and modal analysis on the picking and cutting system.The static results showed that the stiffness and strength of the structure met the design requirements.The modal analysis shows that the natural frequencies of the elastic teeth and the rotary cutting feeding device are 90Hz～100Hz and 155Hz～165Hz respectively.Their natural frequencies do not overlap with the external excitation frequency(52Hz～77Hz),indicating that the picking and cutting system will not resonate and has good stability.(4)ADAMS software is used to perform kinematics analysis on the pick-up device to obtain the contact force between straw and the spring-finger,the speed curve and the acceleration curve of the end of the spring-finger.The results show that in a picking cycle,the spring-finger run at a constant speed,and the maximum contact force with the forage is 28.8N,showing a decreasing trend,indicating that the picking device can effectively pick up the straw.(5)The topological optimization analysis of the rotary cutter head was carried out through Hyper mesh software,and the light-weight scheme of the rotary cutting and feeding device using the punching and hollow structure was determined.These two lightweight designs have reduced weight of Omni-cut Integral rotor by 26.9kg.Checking and calculating that cutting and feeding device’s stiffness,strength and stability meet the design requirements,the optimization effect is better,and the purpose of energy saving and consumption reduction is achieved.