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Share the mechanical action of the rubber in the internal mixer!

Share the mechanical action of the rubber in the internal mixer!

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2020-04-18
  • Views:5

(Summary description)Because the surface of the rotor has spiral sharp edges, the gap between it and the mixing chamber is variable.

Share the mechanical action of the rubber in the internal mixer!

(Summary description)Because the surface of the rotor has spiral sharp edges, the gap between it and the mixing chamber is variable.

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2020-04-18
  • Views:5

1: Kneading between the outer surface of the internal mixer rotor and the wall of the mixing chamber

Because the surface of the rotor has spiral sharp edges, the gap between it and the mixing chamber is variable. The small gap is between the edge of the internal mixer rotor and the inner wall of the mixing chamber. When the rubber material passes through this small gap, it is subjected to strong squeezing, shearing, and stretching. This effect is similar to that of the two-roller pitch of an open mill, but the effect is much greater than that of an open mill. This is because the speed gradient of the rubber material between the rotating rotor and the stationary chamber wall is much larger than that of the open mixer, and the transmission angle formed by the sharp edge of the rotor and the mixing chamber wall is sharp.

two: mixing, stirring and squeezing between the two rotors of the internal mixer.

The distance between each point of the elliptical surface of the two rotors of the internal mixer and the axis of the rotor is not equal, so they have different peripheral speeds. Therefore, the gap and speed ratio between the two rotors of the internal mixer are not a constant value, but are different everywhere and change from time to time. The difference between the large value and the small value of the velocity gradient is several tens of times. The rubber material can be subjected to strong shearing, squeezing and stirring. The rubber material can be subjected to strong shearing, squeezing and stirring.

Because the two rotors of the internal mixer rotate at different speeds, their relative positions change all the time. The capacity of the rubber material between the two rotors also changes frequently, resulting in strong mixing and stirring.

3: Shunting, shearing and exchange of upper and lower top bolts.

Due to the diversion effect of the edge of the lower top bolt and the different speed of the two rotors, the rubber material can be folded and tamped in the left and right mixing chambers. Part of the rubber material (high pressure zone) in front of the rotor of one of the internal mixers is squeezed to the back (low pressure zone) of the opposite mixing chamber rotor, and then brought into the hopper. Change each other back and forth.

In order to exchange effectively, a rotor must transfer the rubber directly into the gap behind the corresponding rotor edge. Otherwise, exchange is prevented due to pressure balance. This requires the two rotors to be turned to the appropriate position for exchange, which depends on the speed ratio.

When the rotor is rotating, the rubber compound produces a positive pressure on the rotor at the spiral edge, which is p'. According to the acting force and the reaction force, the vertical force generated by the rotor at the protruding edge is P, which is decomposed into the circumferential force (radial force) Pr and the tangential force Pt. The role of Pr is to make the rubber around the rotor axis Rotation, Pt function is to make the rubber material produce axial movement.

Pt =P×tga

The rubber material produces axial movement on the rotor ridge. There must be friction to prevent the compound from moving axially. Friction force T=Ptg@, because only Pt is greater than T, the rubber can move axially. That is, a is greater than @, @=37°-38°, so a is greater than 38°.

Therefore, the rubber material moves axially at the short edge of the rotor. Reciprocating cutting of the rubber material: Since a=30° is smaller than @ at the long edge, the rubber material will not move axially, but only produce circular motion, which plays the role of material transportation and rolling.

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