SU1599203A1 - Mixer for polymeric materials - Google Patents

Abstract

The invention relates to polymer engineering, in particular to the design of a batch mixer for polymeric materials. The purpose of the invention is to increase the productivity of the mixer by reducing the waste of the processed material. For this, the sections A and B of the rotors 2, 3 enclosed between the end walls 6, 7 of the mixing chamber 1 and the bases of the blades are conical. The top of the cone is facing the end walls 6, 7 of the mixing chamber 1. The angle of taper in sections "B" of the rotors, diametrically opposed to the large blade m 4, is selected from 3-10 °. The angle of taper on the sections "A" of the rotors located diametrically opposed to the small blade m 5 is selected in the range of 10-30 °. The ratio of the interface radii of the conic sections "A" and "B" of rotors with end surfaces of chamber 1 and with blades 4, 5 is selected within the limits of R ₁ / R ₂ = 0.5-0.8. The radius R _{1 of the} interface of the conic sections "A", "B" of rotors with the end surfaces of chamber 1 is chosen to be (0.05-0.2) D, where D is the outer diameter of the rotor. 1 hp f-ly, 1 ill.

Description

The invention relates to polymer engineering and can be used in the construction of batch mixers for processing polymer compositions, rubber compounds and other polymeric materials.

The purpose of the invention is to improve the performance of the mixer by reducing the waste of the processed material.

The drawing shows a mixer, a common

view.

; The mixer contains a mixing chamber: ru 1, drive rotors 2 and 3 installed in it, each of which has: a larger 4 and a small 5 blade, and a drive: for turning, rotors 2 and .3 towards each other (not shown ). Areas a and fc of rotors 2 and 3, enclosed between the end walls 6 and 7 of the mixing chamber 1 and the bases of the blades 4 and 5, are made conical with the apex of the cone,

facing the end walls b and 7 of the mixing chamber 1. The angle of taper a on sections b of rotors 2 and 3 is selected within 3-10 °, and the angle of taper p on sections a of rotors 2 and 3 is selected within

10-30 °.

: The rotors 2 and 3 are fixed on the shafts 8 and 9, on which the sealing devices 10 and 11 are mounted.

The ratio of the radii of interface of the conic sections a and b of rotors 2 and 3 with the end surfaces 6 and 7 of chamber 1 and with the lasers

Tips 4 and 5 are 5-0.8, and

-i

the radius R of the interface between the conical sections of the rotors and the end surfaces 6 and 7: chambers 1 is chosen to be (0.05-0.2) /), i where D is the outer diameter of the rotor. The implementation of sections a and 6 of rotors 2 j and 3 between the end walls 6 and 7 of the chamber and the blades 4 and 5 with an angle a between the generator of the cone and the central axis of the rotor, is less than 3 °, in areas b diametrically opposed to the large blade m 4, and with an angle p less than 10 ° in the areas of the rotors diametrically opposed to the small blade m 5 does not provide a reduction in the sweepings due to the fact that the amount of back pressure caused by narrowing the channels to the end surfaces of the chamber formed by conical surfaces mi sections a and b of the rotors and ste kami chamber is not sufficient to limit the flow of material in the sealing devices 10 and 11.

Making portions a and pto rotors 2 and 3 between the end walls 6 and 7 of chamber 1 and blades 4 and 5 with an angle a greater than 10 ° and an angle p greater than 30 ° result in the formation of stagnant zones in the mating areas rotors 2 and 3 with end surfaces of blades 4 and 5, which reduces the quality of the processed material.

The implementation of the interface radii of the conical sections of the an b of the rotors 2 and 3 with the end surfaces 6 and 7 of the chamber l (Ri) and the blades 4 and 5 (R) with the ratio

, 8 at (0.05-0.2) D leads to the formation of stagnant zones in places of resistance.

The implementation of the interface radii of the conic sections a and b of the rotors 2 and 3 with the end surfaces 6 and 7 of the chamber 1 and with

blades 4 and 5 with a ratio of 5 at Ri (0.05-0.2) D will significantly reduce the taper and do not provide sufficient pressure drop to reduce the outflow pressure compared with the known device.

The value of Ri (0, Ob-0,2) D is determined

possible equipment size,

including laboratory mixers (i

0.05D) and production mixers

large unit capacity (, 2D).

The mixer works as follows.

When rotors 2 and 3 are rotated towards each other, the processed material is mixed with blades 4 and 5. In the central part, the mixture flows from one blade to another along the conical part of the rotor body. In this case, due to the conical surface of the rotor body, a back pressure is created between the end walls of the chamber and the blades, which limits the flow of material to the sealing devices 10 and 11 and ensures a reduction in the extrusions.

Example. A rubber compound is made in a batch mixer;

containing two rotors 2 and 3 rotating towards each other with large and small mixing blades 4 and 5 and sealing devices 10 and 11 mounted on shafts 8 and 9 of rotors 2 and 3. Sections a and b

the rotors 2 and 3 between the end walls 6 and 7 of the chamber 1 and the blades 4 and 5 are made conical with the bases of the cones located near the end walls of the chamber, and the angle between the cone forming and the central axis of the rotor is 6 ° in the area diametrically opposite the large the blades 4, and 20 ° in the area diametrically opposite the small blade 5. The ratio of the radii of conjugation of the conical sections of the rotor's tat to the end surfaces of the chamber and the blades is

0.65 with Ri 0, lD.

During the manufacture of the mixture, the amount of vypressovki amounted to 0.07% of the mass of the filling due to the creation of a counterpressure resulting from narrowing of the channels formed by the conical surfaces of the rotor body and the walls of the chamber to the end surfaces of the chamber, the mixer performance increased.

Claims (2)

1. Mixer for polymeric materials, containing a mixing chamber, drive rotors installed in it, each of which has a large and a small blade and a drive for rotating the rotors towards each other, characterized in that, in order to increase the performance of the mixer by reducing waste of the processed material , the areas of the rotors enclosed between the end walls of the mixing chamber and the bases of the blades are made conical with the apex of the cone facing the end walls of the mixing chamber, and l taper portions on the rotors located diametrically opposite large vanes, is selected in the range 3-10 °, and the taper angle on the rotor portions disposed diametrically opposite small vanes, is selected within 10-30 °. 2. A mixer according to claim 1, characterized in that the ratio of the conjugation radii of the conical sections of the rotors with the end surfaces of the chamber and with the blades is selected / g within the limits, 5-0.8, and the interface radius of the conical sections of the rotors with the end surfaces of the chamber is chosen equal to (0.05-0.2) D, where D is the outer diameter of the rotor.