RU2510873C1 - Rotary vibration mixer - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to rotary vibration mixers to be used in production of colloidal polymer grouts, wall nut oil, tooth pastes, etc. Mixer comprises mixing rotary member 1 and poker vibrator 6. Mixing member is composed of funnel-shape shell with cylindrical part 2 and conical part 3. Said poker vibrator 6 is fitted coaxially inside mixing member 1 so that vibrator free end is located at cylindrical part 2. Said vibrator 6 can be composed by vibrator with kinematic drive, unbalanced mass vibration generator or that with planetary vibration mechanism. Zone of efficient vibratory mixing is created between vibrator 6 and inner surface of cylindrical part 2. Accelerated homogenisation and dispersion of the mix components occurs in said zone by centrifugal forces originating at rotation of said mixing member for said mix to be circulated from inner space of mixing member into mixing chamber 12.

EFFECT: intensified mixing of high-concentration dispersed mixes.

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Description

The invention relates to rotary-vibrational type mixing devices and allows to intensify the mixing process of highly concentrated dispersed mixtures, for example colloidal polymer-cement solutions, walnut oil, toothpastes, etc.

A mixer is known [SU 1301476, B01F 11/00, 1987], comprising a mixing body made in the form of a rotating blade rotor, and a deep (i.e. immersed in the mixture) vibrator with kinematic excitation of vibrations mounted coaxially to the rotor blades. The vibrator is made in the form of a hollow cylinder mounted on a rapidly rotating crankshaft using spherical bearings, and is mounted cantilever to an excitation drive. The entire structure is housed in a mixing chamber into which the components to be mixed are loaded. As a result of combining the processes of convective mixing, carried out using a rotor, and vibrational destruction of the structure of the mixture, leading to a decrease in its viscosity, the mixing process is accelerated and energy costs are reduced.

Closest to the claimed invention is a mixer [patent RU 2033324, B28C 5/14, 1995], containing a mixing body made in the form of a rotor with screw and cleaning blades, and a deep vibrator with kinematic excitation of vibrations mounted coaxially inside the rotor. The vibrator is made in the form of a hollow cylinder mounted on a rapidly rotating crankshaft using spherical bearings, and is mounted cantilever to an excitation drive. Using this mixer, a simultaneous vibrational effect on the mixture, leading to a decrease in its viscosity, and convective mixing of the mixture are also achieved.

The performance of such rotary-vibration mixers is largely dependent on the performance of the vibrator. In turn, the efficiency of the vibrator depends on the degree of disruption of the continuity of the mixture that occurs when it is mixed. This is due to the fact that the arising air transitions between the layers of the mixture dramatically dampen the mechanical vibrations of the vibrator. Therefore, the main disadvantage of mixers having a mixing body in the form of flat (SU 1301476) or screw (RU 2033324) blades is the low efficiency of the vibrator, due to the fact that as a result of rotation of the mixing body the continuity of the mixture is violated.

The technical problem to which the claimed invention is directed is to eliminate this drawback by creating a new mixing body, which will provide convective transfer of the mixture in the mixing chamber, without violating its continuity.

In accordance with the claimed invention, the rotary-vibration mixer includes a rotary-type mixing organ and a depth vibrator, wherein the mixing organ is made in the form of a funnel-shaped shell having cylindrical and conical parts, and the depth vibrator is installed coaxially inside the mixing organ so that the free end of the vibrator is placed in the cylindrical part of the mixing body.

Thanks to the specified implementation of the mixing body and the location of the vibrator relative to it, the following technical result is achieved. The mixing organ performs two functions simultaneously. Firstly, it forms an effective vibrational mixing zone in the space between the vibrator and the inner surface of its cylindrical part, in which accelerated homogenization and dispersion of the aggregates of the mixture, that is, their destruction, and secondly, ensures the subsequent transfer of the mixture subjected to vibrational effects, beyond the inner space of the mixing organ, which is achieved due to centrifugal forces arising from its rotation, the mixture rises along the inner conical surface rotating mixing body and falls already under the influence of gravitational forces into the mixing chamber. With this mixing of the mixture, there is no violation of its continuity, which was characteristic of known mixers.

The invention is illustrated by the following graphic materials.

Figure 1 shows an example implementation of a rotary vibration mixer in accordance with the invention.

Figure 2 shows a structural diagram of a known centrifugal mixing body in relation to the claimed invention.

Figure 3 shows a structural diagram of a mixing body of a rotary vibration mixer in accordance with the invention.

The inventive rotary-vibration mixer (Fig. 1) consists of a rotary-type mixing body 1 made in the form of a funnel-shaped shell having a cylindrical part 2 and a conical part 3 and connected by means of spokes 4 with a hollow drive shaft 5. Inside the mixing body 1 there is a deep the vibrator 6, made in the form of a hollow cylinder 7, mounted on the crankshaft 8 using connecting rod bearings 9. The shank (drive part) of the crankshaft 8 is placed inside the shaft 5. The cylinder 7 is connected to the shaft 5 by m of rubber coupling 10, which ensures the tightness of this connection and the possibility of free radial movement of the cylinder 7. For dynamic balancing of the unbalanced masses of the vibrator 6 are the balances 11 mounted on the crankshaft 8. Also shown in figure 1 is a mixing chamber 12 filled with mixed mixture 13, in which the inventive mixer is immersed.

The inventive rotary vibration mixer is equipped with a crankshaft drive 8 (not shown in FIG. 1), rotating the shaft 8 with a frequency ω, and a stirring organ drive 1 (not shown in FIG. 1), rotating the latter with a frequency of Ω. Structurally, the mentioned drives can be made fixed to the mixing chamber 12. Also, these drives can be made separately from the camera 12 in the form of a hand tool, while the inventive mixer can be connected to the said drives both stationary and detachable in the form of a removable nozzle.

The inventive mixer operates as follows. When the crankshaft 8 is rotated, the cylinder 7 of the vibrator 6 oscillates in a circular path and thereby vibrates the mixture 13 located in the space between the vibrator 6 and the organ to be mixed 1. The vibration effect is most pronounced in the area of the cylindrical part 2 of the mixing organ 1 Under the action of centrifugal forces arising from the rotation of the mixing body 1, the mixture 13 from the above zone begins to rise along the inner surface of the conical part 3 per mixing body 1 and reaching its end, flows into the mixing chamber 12. At the same time, a new portion of the mixture 13 from below under the influence of hydrostatic pressure enters the zone of vibration between the vibrator 6 and the cylindrical part 2 of the mixing body 1. The direction of movement of the mixture 13 is shown in FIG. 1 arrows.

In contact with the vibrator 6, the structure of the mixture 13 is destroyed, its viscosity decreases, which contributes to the dispersion of the aggregates of the mixture 13 and increase its uniformity (homogenization). In the process, due to its rotation, the mixing body 1 provides convective transfer of the mixture 13 in the mixing chamber 12, without violating the continuity of the mixture 13. Thus, the mixture 13 acquires a toroidal motion and is intensively mixed.

As a vibrator 6, another type of depth vibrator can be used, for example, unbalanced [Goldstein B.G., Petrunkin L.P. Depth vibrators for concrete compaction. - M .: Mechanical Engineering, 1966, p. 25, Fig. 15] or with a planetary vibration mechanism [see ibid., p. 30, fig. 21 and fig. 22].

It should be noted that it is known to use a rotating conical surface for convective movement of a mixture, for example, as described in the book: G.D. Kavetsky Equipment for the production of plastics. - M .: Chemistry, 1986, p. 172, Fig. 8.2. However, in combination with vibration exposure, the use of a mixing body consisting only of a conical part does not give the desired result. So, figure 2 presents a structural diagram described in the specified book. G.D. Kavets centrifugal mixing body 14 in the form of a conical shell as applied to the inventive mixer. To achieve the result of centrifugal removal of the highly viscous mixture 13 beyond the mixing body 14, it is necessary to increase the rotation speed of the latter. However, in this case, the mixture 13, located inside the mixing body 14, begins to take the form of a deep funnel (see Figure 2), as a result of which the contact zone of the mixture 13 with the vibrator 6 decreases sharply. As a result, the vibrational efficiency decreases with increasing rotation speed of the mixing body 14 the destruction of the mixture 13 leads to the fact that for this type of rotary-vibrational mixers to apply the known centrifugal mixing body 14 is not possible. In comparison, a funnel-shaped (with a cylindrical part) form of the mixing body of the inventive mixer (see Figure 3) provides the necessary contact of the mixture 13 with the vibrator 6.

To test the operability of the claimed invention and achieve the specified result, a prototype of a rotary-vibration mixer having the following main technical characteristics was manufactured and tested:

the axial length of the mixing organ is 400 mm, including the length of the cylindrical part is 130 mm and the length of the conical part is 270 mm;

the diameter of the cylindrical part of the mixing organ is 250 mm;

the diameter of the end of the conical part of the mixing organ is 550 mm;

vibrator diameter - 160 mm;

stirring organ rotation frequency Ω = 15 rad / s;

crankshaft rotation frequency ω = 260 rad / s;

the amplitude of the radial movement of the vibrator is 2 mm.

We used a mixing chamber in the form of an inverted truncated cone with a height of 600 mm, a diameter of a larger base - 900 mm, a smaller base - 400 mm. The camera is designed for a volume of finished batch of 80 liters.

Test result. To prepare a pasty mixture of powder clay in an amount of 120 kg and water in an amount of 25 kg loaded into the mixing chamber, it took about 3 minutes of operation of the mixer. Compared with similar tests of known mixers having a mixing body with helical blades, the preparation time of the mixture is reduced by about half.

Tests confirmed the indicated result from the application of the new design of the mixing body - the absence of violation of the continuity of the mixed mixture in the zone of vibration exposure. Due to a significant decrease in the viscosity of the mixture in the zone between the vibrator and the cylindrical part of the mixing organ, high homogenization of the mixture is ensured. Due to its subsequent centrifugal movement, a high "multiplicity of circulation" of the mixture is achieved. Together, this significantly reduces the time of its preparation. In addition, the power consumption of the installation is approximately halved.

Claims (1)

The rotary-vibration mixer, comprising a rotary-type mixing organ and a depth vibrator, wherein the mixing organ is made in the form of a funnel-shaped shell having cylindrical and conical parts, and the depth vibrator is mounted coaxially inside the mixing organ so that the free end of the vibrator is placed in the cylindrical part of the mixing body.

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