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Force analysis of internal mixer roller structure

As one of the parts of the continuous mixer, the roller is subjected to greater transverse pressure, friction, temperature stress, large and small drive gears and speed ratio gears when working. The temperature stress caused by the temperature difference between the inside and outside of the roller and the internal stress produced by chilled casting have an impact on the strength of the roller, and should be considered in the accurate calculation. However, due to the difficulty of calculation, the internal stress can generally be considered in the safety factor.
   During the flow around the rotor, the material is subjected to shear and friction everywhere, which causes the temperature of the rubber compound to rise sharply, the viscosity decreases, and the wettability of the rubber on the surface of the compounding agent is increased, so that the rubber and the compounding agent surface are in full contact. Due to the lateral pressure of the rubber material, the roller has to withstand bending stress. Due to the friction of the rubber material and the friction of the bearing, the roller has to withstand the torsion stress. It can be seen that the roller is actually subjected to the combined stress of bending and torsion. In addition, the role of the roller's own weight must be considered.
  The gap between the rotor and the rotor, the gap between the rotor and the upper and lower top bolts, and the inner wall of the mixing chamber, are sheared and broken, surrounded by stretched rubber, and stabilized in a broken state. At the same time, the ribs on the rotor make the rubber material move along the axial direction of the rotor, and play a role of stirring and mixing, so that the compounding agent is evenly mixed in the rubber material. The compounding agent is repeatedly sheared and broken in this way, and the rubber compound is repeatedly deformed and restored. The continuous stirring of the rotor ribs makes the compounding compound uniformly dispersed in the rubber compound and reaches a certain degree of dispersion. Because the shearing effect of the rubber compound during mixing in the internal mixer is much greater than that of the open mixer, the mixing temperature is high, making the mixing efficiency of the internal mixer much higher than that of the open mixer.



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