Design And Test Of The Second Throwing Cotton Straw Crushing And Returning Machine

To improve the level of cotton straw crushing and returning,the returning of cotton mechanization is the influence of different parameters,solve cotton straw crushing returning machine crushing,high drop rate,outstanding problems.This article to cotton as the research object to carry out the secondary toss type cotton crushing returning key technology research,design the secondary toss device,for the nep returning stalk and residual film recycling joint work lay the foundation.The main tasks of the thesis are as follows:(1)The paper makes an in-depth exploration on the important parts of the design of the secondary throwing-type cotton stalk grinding returning machine.Structure parameters of the first step to returning to crushing machine and its operating characteristics to carry out detailed analysis and research,this paper introduces the secondary toss type cotton returning crushing machine working principle,structure design of key structure,analyzed the structure and wearing parts left the knife,the research for cotton straw returning grinding machine design and laying a foundation for the choice of key parts.(2)In view of the problem of large cotton stalk drop rate and too low crushing rate in the cotton straw comminution returning machine,a secondary flinging type cotton straw comminution returning machine was designed.No support under the cutting knife roller speed desirable 2463 r/min,arc discharge chamber Angle for 42°,the installation of secondary toss height is 1024 mm,determines the sling arrangement,moving knife gap distance,discharging mouth area of key parameters,such as to finalize the design of secondary toss device,lay a foundation for the field experiment in the late.(3)The flow field in Fluent was analyzed for the secondary flinging cotton straw pulverizer returning machine.According to the planting mode of cotton straw,the basic structural parameters of the machine model were determined,the mathematical model of the machine working condition was established according to the fluid control equation,the basic principle of the flow field in the machine was revealed,and the basic motion characteristics of the broken straw in different winds were analyzed.In the simulation study of the machine and tools,the flow field distribution of the initial model is obtained,the air supply velocity is changed by changing the rotation speed of the cutter and roller,the flow field variation trend and the appropriate range of throwing parameters are obtained at different levels,which all meet the work requirements,and the design of the machine and tools is reasonable.(4)Processing secondary flinging type cotton straw crushing and returning machine,field test.This paper select knife roller speed,forward speed and clearance from the ground as the test factors,the secondary toss type cotton field experiment returning straw crushing machine,cotton crushing rate and the drop rate as the response value of three factors and three levels of quadratic regression orthogonal experiment,through the DesignExpert software to optimize the data processing,machine is obtained by calculation and analysis of the optimal combination of parameters is:knife roller speed 2490.26 r/min,speed of 4.90 km/h,76.3 mm clearance from the ground.The predicted values of the objective function are as follows:the cotton stalk crushing rate is 98.56%,and the cotton stalk dropping rate is 3.18%.In order to judge the accuracy of the prediction,three verification tests were carried out in the cotton field of Yinfeng modern agricultural equipment co.,LTD.,the 49th regiment of Xinjiang production and construction corps.In machine work parameter is set to the knife roller rotation speed is 2490.00 r/min,the speed of 4.90 km/h,76.0 mm clearance from the ground operation conditions,the test results for counters-field cotton crushing rate was 98.78%,cotton drop rate was 2.88%,the test values and the software of prediction error is less than 5.00%,the machine can be done better cotton straw returning grinding operation,to verify the secondary toss type cotton straw returning grinding machine of theoretical analysis and the rationality of structure design parameters,of this type of machines and tools for the improvement and improve to provide a train of thought.