Dynamic Wear Simulation And Experimental Study Of Synchronous Quadrangle Rotor In Internal Mixer

As the core component of the rubber mixing equipment,the rotor is subjected to the friction of rubber and its filler in the mixing process,which will lead to the wear of the surface of the rotor,and then affect the clearance between the rotor edges and the rotor and the internal mixer chamber wall.The more serious the rotor wear is,the greater the gap between the rotor edge and the inner mixing chamber wall is,which leads to the weaker shearing effect of the rotor on the rubber,and the uneven dispersion of the filler in the rubber,which will affect the mixing effect and the quality of the mixing rubber.Because the rotor is installed in a closed mixing chamber,its wear is difficult to observe,at present,the rotor can only be determined by testing the performance change of the compound to determine whether the rotor wear is serious,which has a great impact on the production stability of the quality of the compound.Therefore,it is very important to establish a numerical simulation model to simulate the wear of rotor.Based on the viscoelastic solid rubber mixing process theory and mechanism of friction between the rubber and metal,combined with the Discrete Element Method(DEM)to establish the four edges mixer synchronous rotor dynamic simulation model of wear and tear,the simulation results under different mixing parameters is analyzed,and a control experiment,verify the feasibility of EDEM rotor wear dynamic simulation model.The main work completed in this paper is as follows:1.Determined the scheme of using discrete element method to study rotor wear in mixing process.On the basis of reading a lot of relevant literature,the working principle of internal mixer,the research status of rubber-metal friction theory,the numerical simulation method of mixing process and the discrete element method in the simulation of wear problem were analyzed.In theory,the discrete element method in the simulation of rotor wear problem was discussed.2.The mathematical model of rotor wear in mixing process based on discrete element method was established,and the numerical simulation model was established in EDEM.Visual mixer platform was used to calibrate the surface energy parameters of rubber particles and between rubber and compound particles.Friction and wear testing machine was used to calibrate the wear coefficient between rubber particles and metal rotor,in which:The surface energy between rubber and rubber particles is4 J?m ²,and the surface energy between rubber and compound particles is 2 J?m²;The wear coefficient K between particle and rotor is 1.2×10^-12.3.The simulation calculation was carried out under different mixing parameters,and the simulation results were analyzed.The flow field,pressure field,velocity field and the variation of particle mixing state in the internal mixer during rubber mixing were discussed,as well as the rotor wear condition under different mixing parameters.Among them,the mixing degree of the complex agent decreases with the increase of the rotating speed,and decreases first and then increases with the increase of the filling coefficient.When the filling coefficient is 0.65,the mixing degree is the lowest.The higher the rotating speed and the larger the filling factor,the more serious the wear of the rotor.The white carbon black system formula will cause more serious wear on the rotor than the carbon black system formula.4.The new multifunctional friction and wear experimental platform was used to carry out the control experiment,and the experimental results were compared with the simulation results.In the experimental results and simulation results,the mixing effect of compound and rubber under different mixing parameters is consistent with the influence of rotor wear,which verifies the reliability and accuracy of the dynamic simulation model of synchronous four-edge rotor wear in internal mixer.5.The engineering mathematical model of average wear depth and mixing time of rotor surface was established.Based on the least square method,an algorithm was designed in Python to establish the fitting curve between mixing time and the average wear depth of the rotor surface,which has a certain guiding significance for the prediction of rotor wear.