Research On Wear Characteristics And Structural Optimization Of Key Components Of Horizontal TMR Mixer

Horizontal TMR mixer is the key equipment in TMR feeding technology,which can reduce the working time and improve the chopping effect to a certain extent.Due to the poor working conditions of the mixer,there are many problems in the use process,such as high power consumption,easy wear of plum blades,low lubrication performance of bearings and poor sealing effect of bearings,so it is easy to damage the horizontal TMR mixer in the process of operation.Therefore,how to improve the wear resistance of the key components such as the quincunx blade and bearing of the horizontal TMR mixer and reduce the wear is an effective way to improve the service life of the mixer.This paper studies the wear characteristics of the key components of horizontal TMR mixer,such as the quincunx blade and bearing,focusing on the analysis of the influence of material,rotation speed and elements on the friction and wear characteristics of quincunx blade?friction coefficient,wear amount,wear rate and wear trace morphology?;building bearing grease test platform,study the lubrication characteristics of nanoparticles in lithium grease,and determine the best ratio of nanoparticles;analyzing the wear failure of the plum blossom blade,optimize the material characteristics of the blade to improve the wear resistance of the blade;According to the theoretical calculation and analysis of the bearing,the improvement design of the bearing sealing structure and the optimization selection of the lubricating grease are carried out,and the temperature rise test and the rapid acceleration test are carried out.Through the experimental study,the main conclusions are as follows:?1?The wear test of the sample of plum blossom blade shows that the 65Mn blade has the best wear resistance under different materials,rotating speed and elements,and the wear degree of the sample increases with the rotating speed.In addition,due to the solution strengthening of manganese and nitrogen and the strengthening of alloy cementite,the ability of blade specimen to resist plastic deformation is enhanced,so as to improve the wear resistance of blade specimen.After the wear test,the wear process is simulated by ANSYS,and the maximum contact stress of T10,65Mn and 60Si₂Mn materials is 0.04198,0.04182 and 0.04208 MPa,respectively.The simulation results are brought into the established mathematical model,and the total wear depth of 65Mn,60Si₂Mn and T10 materials is 6.963,5.906 and9.269?m,respectively,compared with the average wear depth of the sample after the wear test,it is found that the change trend of the wear depth of the simulation and the test results is consistent,which shows that the established mathematical model has high reliability,and also proves that the finite element method can be used to calculate the wear depth of the sample surface under the dry friction condition.?2?The effect of different BN content on the wear performance of grease was studied.It is found that the average friction coefficient of the lubricating grease containing 0.60wt%BN is the lowest?0.096?,and the average wear scar radius is the lowest?261.524?m?,which is 19.5%and 8.3%lower than that of the basic grease respectively.In addition,under the condition of this content,the wear surface is smooth,showing the best anti friction performance.This is because the lubricating film formed by boron nitride deposition can effectively prevent the direct contact of friction pairs,improve the anti-friction performance of lubricating grease;at the same time,the layered structure of boron nitride nanoparticles makes it easy to slide between layers,with low friction coefficient and good anti friction performance.?3?The verification test of the optimized blade material shows that the wear surface of 65Mn quincunx blade is relatively flat,with a small number of furrows and peeling pits.Combined with the wear quality,it can be seen that the optimized quincunx blade material shows better wear resistance,which can effectively improve the service life of the quincunx blade of the horizontal mixer,and verify the effectiveness of the improvement scheme.The results of temperature rise test and quick acceleration test show that the improved bearing sealing structure and additive grease have stable and reliable performance in the performance verification test,so the improved bearing sealing structure and BN grease can effectively improve the antifriction performance of the bearing,which proves that the improved scheme is effective avoid faults.