Design And Experiment Of The New Smashed Straw Machine Blade

Smashed straw returning field technology is a core part of the conservationtillage. It can not only improve the utilization of straw, but also can increase soilorganic matter, improve soil physical properties and structure of the fixed, save thecarbon, nitrogen and other nutrients, promote the conversion of plant nutrients in thesoil, improve soil water storage capacity, increase food production, protect nationalfood security and promote the sustainable development of agriculture.The blade is an important working parts of the smashed straw machine. Thisthesis focuses on the analyze of the blade work process, summarizing the advantagesand disadvantages of the existing blade, designing the new VL-type blade. Andoptimizing the blade structure parameters. Finally, useing the optimum parameters theblade to carry out the whole field performance experiments.Based on the advantages and disadvantages of the existing blade, throughstructural innovation the new VL blade is designed by Inventor3D software. Usingthe finite element module of Invenor, the new blade finite element static mechanicalwas analysed, and came to a reasonable thickness of the new blade is8mm. By theanalysis of the crushing process, the forerake was added to overcome the backwarddeflection of the blade in the course of their work in the new blade structural design.Compared with the existing blade, the new blade can increase the moment of inertia toimprove the grinding efficiency of the machine and extend the life of itself.Based blade design, the9different parameters new blade was made. Theprocessing of raw material of the blade is a65Mn steel plate. In the process, followthe international and domestic processing lines and5mm thick high-frequencyquenching was Implemented at the surfaces of the blade edge. So reach the purpose ofsharpening function which has be dsdgned.The different parameters blades were assembled on smashed straw machine tocarry out the structural parameters of the two-factor test of the blade. In that process,The measure is the straw chopping rate. Getting optimum blade structural parametersby experiment, which is Blade forerake angle is10°and the angle between the blade edge line and the ground is14°. Using the optimum parameters blade test machineunder different operating parameters, and obtained the optimum blade machineoperating parameters, which is the knife shaft speed is1400r/min and tractor forwardspeed is1m/s. By testing the combined effect of the new blade assembly machine, wecan know that straw chopping rate is93.34%, Between the tire footprint stubbleaverage height of61mm, the Inhomogeneity of straw throwing is less than14.7%andPure productivity can achieve0.48Hm~2/(m h). The work target of the machine allhave be met and exceeded national standards. useing the JMM testing machine, TheNew blade sharpening function was tested. Measurement results of blade size showthat the wear resistance at edge line is more excellent. So the blade will be more wearand tear more sharp in the process of using. That is the blade with self-sharpeningfunction which has be designed.This paper is a research and innovation on the blade. The development of thenew blade has some practical value and provide some referencevalue for the furtherstudy of straw chopper machine.