Research And Experiment On Compression Mechanism Of Corn Combine Reaping Both Stalk And Spike

With the development of straw storage technology,corn straw has been widely used as a quality feed.At the same time,corn stalks are one of the most promising clean renewable energy sources.Therefore,the comprehensive utilization of corn stalks is of great significance to the development of animal husbandry and energy in China.The collection,storage and transportation of straw is the key link in its industrialization.The effective and high-quality corn straw compression mechanism is an important guarantee for this link.Based on the review of bales technology and equipment at home and abroad,starting from the research on mechanical model and mechanical properties of corn stalks,theoretical analysis and simulation analysis are combined to study the compression piston mechanism of the key structural components of the bale device.,and through the systematic experiment,the strapping device is optimized and designed so that the performance of the compacted bundles tends to be stable,the work is more reliable,and the operating performance indexes such as bundling rate,regular bundling rate and packing density are effectively improved.The main research contents and conclusions are as follows:(1)In this paper,the corn stalk was firstly studied as a linear elastic model of a cylinder with three structures of skin,pulp and knot.Using the mature corn stalks as experimental materials,the mechanical tests were carried out on the universal testing machine to get the change rules during the bending and compression of corn stalks.And the axial compression of corn stalks and the radial compression process is not exactly the same.Besides,through experiments,data processing and analysis,it can be seen that under different experimental conditions(moisture content,with or without sections,internodes),the impact of various factors on the compression characteristics of indicators are different,but they are all important factors affecting the compression characteristics of corn stalks.(2)Design and modeling the compression mechanism of the key components of the corn stalk baling device,and then carry out the kinematics and dynamics simulation analysis.By drawing on existing model designs and rack reservations,determine the eccentric distance was 20mm,the effective travel was 540mm,and the angle between the two limited location of piston was 2°,and use the geometric relationship to calculate the crank length r was 270mm,connecting rod length L was 620mm.In addition,other parameters were determined as follows:the bale section size was 400×480 mm and the piston compression frequency was 93 r/min.Based on the virtual prototyping technology,the kinematics simulation of the compression mechanism is performed in the ADAMS environment,and the displacement,velocity and acceleration of the piston under the set conditions are analyzed.The dynamics simulation of the articulated joints of the mechanism is performed to analyze the variation law of the force between the crank,the connecting rod and the piston,and the maximum force is determined for the verification.(3)Binding performance test carried out to optimize the bale structure and operating parameters.First through the single factor test,the effects of three factors of feeding amount,packing length and outlet height on the rate of bundling,rate of packing and packing density were studied.Clarify the impact of various factors on the performance of compressed bundles into the law.Through the optimization of response surface methodology,establish regression model,and optimize the multi-objective parameters to determine the best combination of parameters,that is,the amount of feed is 3 kg/s,the length of the bales is 700 mm,the height of the outlet is 240 mm.Finally,it is verified through experiments that under the optimal combination of parameters,the baling rate is 97.78%,the rule bundle rate is 94.15%,the packing density is258.37 kg/m~3.