| Inverse rotation is the opposite of the rotation of the rotary tiller wheel compared to the forward rotation,reverse rotation tillage has the characteristics of strong soil breaking,large amount of soil throwing,good embedding effect,etc.However,its rotary tillage resistance is larger than positive rotation,and the fuel consumption is high,which is not easy to be accepted by users,the arrangement of rotary tillers is also a major factor in power consumption,so it is necessary to optimize the arrangement of rotary tillers.In this paper,the national standard rotary tiller IT245 and an optimized rotary cutter(IT245P)arrangement are the research objects,taking the balance and power consumption of the unit as the index,the target of reducing the force on the bearing of the rotary cutter,through the design method research and its motion analysis,the ADAMS software is used to simulate the dynamics of the rotary cultivator model.In the case of reversal,the tool arrangement mode is evenly designed,and the test combination parameters of the tool axis with minimum bearing force are obtained.The discrete element numerical simulation is performed in the discrete element software EDEM to verify the power consumption and performance.Mainly done the following work:(1)The three-dimensional model of IT245 and optimized IT245 P reverse rotary tiller is established after the rotation of the rotary tiller and the force analysis,comparison of Power Consumption Simulation of IT245 and IT245 P Rotary Cutter with Finite Element Software ABAQUS.(2)Using the dynamic analysis software ADAMS to carry out the inversion simulation of the IT245 P rotary cutter,with the unit balance as the standard,the minimum force of the cutter shaft to the bearing is the target,select two common arrangements 30-140-200(rotary cultivator installation phase angle 30°,rotary cultivator spacing 140 mm,cutter shaft speed 200 r / min)and 45-160-200 analysis of the difference in force to continue to the target value,the uniform test is designed by the three factors of the phase angle,the rotary cutter spacing and the cutter shaft speed.The second-order polynomial is used to carry out the stepwise regression method to process the numerical value.The relationship between each parameter and the cutter shaft force on the bearing force is analyzed,when the minimum force is obtained,the optimal combination of parameters is 50-155-200,that is,the rotary cutter is installed with a phase angle of 50°,the rotary cutter pitch is 155 mm,the cutter shaft speed is 200 r/min,and the 50-155-200 is arranged.Compared with the pre-optimization force,the method is reduced by about 60%.(3)Based on the analysis of soil structure and properties in nature,combined with the characteristics of soil in the Huaihe River Basin,the Hertz-Mindlin with JKR bond model suitable for discrete element simulation was selected.(4)Based on the Hertz-Mindin bond model of discrete element method,the shallow,middle and deep layers of soil were established in EDEM to study the interaction between particles and rotary tillage components,and set the mass calculation domain between the rotary cutter and the retaining cover.The three types of arrangement were analyzed in the rotary tillage operation.Compared with the optimized arrangement,the overall force of the rotary tilling parts was reduced,and the power consumption was reduced by about 13% on average.Test and compare the arrangement of IT245 and IT245 P application 50-155,analyze its soil-soiling performance,soil-breaking performance and burying ability.After calculating the particle quality in the calculation domain,the performance of the rotary cutter is improved by 11.85%;Through the bond between the particles,the crushing rate of the tool during the simulation time is improved by 9.5% after the optimization of the performance of the crushed soil;By calculating the position of soil and straw after rotary tillage,the ability to bury the rotary cutter after reversing is 11.26% higher than that before optimization. |
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