The Mixing Mechanism And Experimental Study Of Four-Wing Fully Symmetrical Synchronous Rotor Internal Mixer

In recent years,with the rapid development of the national economy,the domestic demand for rubber raw materials and rubber products is also increasing,the industrial structure of the rubber industry is constantly optimized and adjusted,the speed of upgrading of traditional rubber machinery is accelerating,and new mixing equipment emerges endlessly.But the internal mixer is still the most important rubber mixing equipment,from the emergence to now has derived a variety of models and specifications.For the internal mixer,the most important component is the rotor.The research of the internal mixer is in the final analysis of the rotor.Based on a large amount of relevant data,this paper has done the following work on the basis of the in-depth understanding of the mixing mechanism and mixing process of the internal mixer and rotor:1.Combining with the 0.3L mixer in laboratory,the four-wing fully symmetrical synchronous rotor is designed.The wing length and helix angle of the four-wing fully symmetrical synchronous rotor break through the traditional design rules.The design of long wing and variable helix angle instead of short wing is adopted.The shearing effect of the rotor on the rubber and the axial and circumferential fluidity of the rubber are enhanced,the mixing effect is improved and the quality of the rubber is improved.2.The mixing mechanism and mixing process of the the four-wing fully symmetrical synchronous rotor internal mixer are analyzed systematically,and the rotor was modeled by Creo three-dimensional drawing software.3.The EDEM software was used to simulate the influence of the 0° and 90° phase relationship of the four-wing fully symmetrical synchronous rotor on the dispersion of rubber and carbon black.The results show that the distribution of carbon black in 90° phase relationship of four-wing fully symmetrical synchronous rotor is better than that in 0° phase relationship.The mixed-index,local-shear-rate,pressure and viscosity of the four-wing fully symmetrical synchronous rotor with phase angle relationship 0°and 90° were simulated by POLYFLOW software.The results show that the four-wing fully symmetrical synchronous rotor with phase angle relationship of 90° that the mixed-index is higher than 0° phase angle relationship,the pressure of the rubber compound is also lower than the 0° phase angle relationship,but the local-shear-rate difference is not obvious.The lowest viscosity of the two phase angle relationships appear at the same position,but the highest viscosity appears at different positions.The 0° phase angle relationship highest viscosity mainly occurs in the middle of the rotor groove,and the 90° phase angle relationship highest viscosity mainly occurs in the middle part of the two rotors.4.Rubber mixing experiments were carried out on a 0.3L mixer for four-wing fully symmetrical synchronous rotor with phase angle relationship 0°and 90°,wide-wing synchronous rotor,four-wing synchronous rotor under different mixing conditions,and the properties of the compound were tested.The results show that the carbon black dispersion,fluidity,mechanical properties and vulcanization properties of the four-wing fully symmetrical synchronous rotor are improved in varying degrees compared with those of the wide-wing synchronous rotor and the four-wing synchronous rotor under the same mixing conditions.It shows that the four-wing fully symmetrical synchronous rotor can enhance the shear,tensile and axial and circumferential fluidity of the rotor to the rubber,and make the mixture and rubber more flexible.The dispersion and distribution of the rubber are more uniform,and the quality of the blended resin is improved.