SU910423A1 - Auger mixer for polymeric materials - Google Patents

Description

(5) WORM MIXER FOR POLYMER MATERIALS

I

The invention relates to equipment for the production and processing of polymeric materials, preferably in elastic, for example, rubber compounds.

A continuous worm mixer is known, comprising a housing with a feed funnel and a discharge opening and two or more interlocking worms with intermittent cutting in the displacement zone 1 rotating inside it.

A disadvantage of the known mixer is its low productivity and mixing efficiency, since the mixing elements in it are arranged along a helical line with the same angle of inclination to the longitudinal axis of the screw.

The closest to the technical nature of the invention is a screw mixer for polymeric materials, comprising a housing with a feed funnel and a discharge opening.

At least two interlocking rotating screws with a discontinuous screw thread in the mixing zone, made in the form of ridges, forming screw channels 2 between them. In this mixer, the ridges are located at different angles, for example (10 ° to the axis of the screw.

Mixing in the specified continuous mixer is provided

10 mainly due to the creation of conditions in the mixing zones for multiple dissection and connection of material flows across the width. Since the mixing zones of the screws are not dependent on each other and have a thread-through cut, there are practically no conditions for the redistribution of materials between the mixing zones and for the flow

20 processes of mixing between the surfaces of the ridges and cores of the screws 3 the moment of their interaction on the 1-linking line of the screws. This is limited39

The possibility of a known continuous mixer with discontinuous cutting in the mixing zone is enhanced by an increase in its productivity and an increase in the mixing intensity.

The purpose of the invention is to intensify the process of mixing materials.

This goal is achieved due to the fact that in a worm mixer for polymeric materials, comprising a housing with a feed hopper and a discharge opening, at least two interlocking, rotating worm with a discontinuous screw thread in the mixing zone, made in the form of ridges forming between them screw channels, screw-cutting ridges are made in the form of semi-turns, displaced one relative to the other along the axis of the screw by the width of the half-thread. The semi-turns in the place of their docking are made with bevels placed on the side of the discharge opening and forming passages connecting the adjacent screw channels. In addition, the casing is made with transverse grooves placed on the intersection lines of the surrounding mixing zones of the screw surfaces of the casing surfaces.

FIG. 1 shows a mixer in section; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. one; in fig. 4 shows a section B-B in FIG. one; in fig. 5 is a section of YYD in FIG. one; in fig. 6 and 7 shows the sweep of the mixing zones of worms.

The continuous screw plunger comprises a housing 1 with a feed funnel 2 and a discharge opening 3 to which a profiling head is connected. Inside the housing 1, interlocking rotating screws 5 are intermittently cut in the mixing zone 6, the crests of which are made in the form of semi-turns 7 arranged displaced along the axis of the screw by a width of half-turn and forming autonomous screw channels 8 between them.

Each half-turn 7 is the beginning and continuation of channels 8 formed by the preceding and following two half-turns, respectively. For the passage of material from the channel to the channel at the joints of the edges 9 of the semi-turns 7 along the movement of the material from the side of the hole 3

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beveling made about. forming the aisles 10.

When the screws are turned, 5 half-turns 7 one worm paired with a channel

5 8 of another worm form an autonomous displacement node. To improve the redistribution of material from the worm to the worm to the I1 intersection lines covering the worm 5

0 surfaces 12 and 13 of the housing 1 are made transverse grooves T.

Depending on the purpose of the mixer and the properties of the processed materials, the outer surface 15

The 5 half-rolls can have a sickle-shaped 1b, a saw-tooth 17 or another known type of profile, providing an intensification of the displacement process by creating conditions for the interaction of these surfaces with the surfaces 12 and 13 of housing 1 surrounding them.

The mixer works as follows.

5 Components to be displaced separately, in the form of compositions, are fed into the feed hopper 2 of body 1, captured by rotating screws.

5 and served in the mixing zone 6, where 0 they are under the influence of semi-turns 7

through the passages 10 and the transverse grooves 1A from the channel to the channel 8, both on the screws themselves, 5, and from the screws on to the screws.

5 In this case, not only is multiple splitting and connection of flows occurring, but also their redistribution between the worms. As a result, complex component trajectories and the necessary shear deformations are created. Since each screw channel 8 of one worm, paired with the half wrench 7 of the other worm, is formed by autonomous displacement nodes communicating with each other through passages 10 and grooves 14, the resistance to movement of the components of which is much more resistance in the channels 8 themselves, between the surfaces of the half-turns 7 and cores of screws, processes similar to those between the surfaces of the rollers of the mixing rollers take place. All this together provides intensive mixing of the components and the formation of a homogeneous mixture.

The resulting mixture from the mixing zone

Claims (2)

6 is fed through the discharge opening 3 to the main head, from which it emerges as a profile of a predetermined section. The mixing process can be further intensified if the outer surface 15 of the semi-rollers 7 is provided with crescent 16, sawtooth 17 or other known types of profiles that create conditions for the interaction of the surfaces 15 with the surfaces 12 and 13 of the housing 1 surrounding them. The proposed device, along with multiple dismemberment and compounding of material flows characteristic of mixing zones of known mixers, provides multiple redistribution of material between the screws and creates conditions for the flow between the ridges of the helical cuts and the cores of the screws batch mixers with interlocking cylindrical rotors and on mixing rollers, which improves the performance of the mixer, increases the intensity s and improves mixing. Claim 1. Worm mixer for polymeric materials containing a core in /, with a hopper and a discharge hole, at least two interconnections of rotating screws with a discontinuous screw thread in the mixing zone, made in the form of ridges forming screw channels, characterized in that, in order to intensify the process of mixing materials, the ridges of the screw thread are made in the form of semi-turns arranged displaced relative to each other along the axis of the screws by the width half ka, and the semi-turn in the place of their docking is made with bevels placed on the side of the discharge opening and forming the passages connecting the adjacent screw channels. 2. -Mixer according to claim 1, about tl, which is due to the fact that the housing is outgrown, lined up with cross-sections on the intersection lines covering the mixing zones of the screws of the housing surfaces. Sources of information taken into account in the examination 1. England Patent If, cl. In 29 F 1/02, published. 1370. 2. USSR author's certificate number 228921, cl. B 29 B 1/10, 19bЗ (prototype). sfog .Z