RU2464078C1 - Rotary dispersing mixer - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to devices designed to continuously prepare mixes of loose materials bearing mechanical mixes and may be used in food and chemical industries, agriculture etc. Rotary mixer comprises: vertical conical case with discharge branch pie arranged at its bottom, bearing assembly wherein the shaft runs, and cover with loading branch pipe. Rotor made up of disc and hollow truncated cones arranged one after another. Taper blade with four vanes is arranged inside inner cone base. Four staggered dispersing blades are arranged on top edges on central and outer cones. Discharge vanes are fitted on said shaft.

EFFECT: higher efficiency of mixing and dispersing.

2 dwg

Description

The invention relates to devices for the continuous preparation of mixtures of bulk materials containing conglomerates, and can be used in food, agricultural, chemical and other industries.

Known centrifugal mixer of powdered materials [1], comprising a housing, loading and unloading devices, a rotor, consisting of sequentially installed hollow truncated cones, the height and angle of inclination of which increases from the center of the rotor to the periphery. This is the main idea of this design. Particles of components under the action of centrifugal inertia begin to move from the center to the periphery along the surface of the cone. Since they have different masses, sizes, and friction coefficients on the surface of the cone, the speeds and trajectories of their motion are different, which, as a result, determines the mixing process. Particle trajectories also depend on the cone angle. Due to this, the mixer rotor consists of three different cones. After passing through all three cones in succession, the bulk mixture enters the bottom of the housing, where it is removed through the nozzle with discharge blades. The continuous mixer (SND) of this design is characterized by insufficient intensity, since it does not provide for recirculation and dispersion of the mixture.

Also known is a centrifugal mixer of powdered materials [2], comprising a housing, material loading and unloading devices, a shaft, a rotor consisting of three cones made of materials, the friction coefficient of which decreases as the cones move away from the central part of the rotor, and blades for unloading the mixture from the apparatus .

The technical drawback of this centrifugal mixer is the insufficiently intense force impact on processed materials containing conglomerates, which makes it difficult to obtain a high-quality final product in such a device. Centrifugal forces applied to the particles of material have unidirectional effects in these devices.

The technical task is to improve the quality of the finished mixture by adding dispersant to the new mixer, which increases the efficiency of the process of mixing bulk materials. To achieve this, a conical knife with four cutting edges is installed in the base of the SND rotor, and four dispersing knives arranged in a checkerboard pattern are installed on the upper edges of the middle and outer cones.

Figure 1 shows in section a General view of a centrifugal mixer continuous operation; figure 2 is an isometric projection of the entire apparatus, made in section.

The mixer consists of the following elements: a vertical (tapering down) conical body 1, a cover 2, on which there is a loading nozzle 3. In the lower part of the body there is an unloading nozzle 4, a bearing assembly 5, in which the shaft 6 is fixed. A rotor consisting of from disk 7 and hollow truncated cones (inner 8, middle 9, outer 10) located with their bases downward. At the base of the inner cone 8 there is a conical knife with four blades 11. On the upper edges of the middle and outer cones 9 and 10 there are four dispersing knives 12 arranged in a checkerboard pattern. Also, unloading blades 13 are installed on the shaft.

The mixer is as follows. The original bulk components are fed through the loading pipe 3 to a rotating conical knife with four blades 11, which destroys the conglomerates contained in them. Then, the loosened and partially crushed components under the action of centrifugal force move upward along the inner surface of the inner cone 8. Next, the mixture is dumped onto the surface of the middle cone 9, reaching its periphery, the material flows and the remaining conglomerates collide with the dispersing knives 12, where additional destruction and mixing occurs loose components. Then the crushed and mixed material flows fall on the surface of the outer cone 10, in which a similar process of mixing and dispersion takes place. Under the action of centrifugal forces, the finished mixture is ejected through the upper base of the cone 10, enters the lower part of the housing 1 and is removed from the apparatus by the discharge blade 13 through the pipe 4.

The intensification of the processes of mixing and dispersion of bulk components containing conglomerates is achieved by repeated destruction of the latter, due to the installation of conical and dispersive knives. As a result of this, the mixing process takes place in thin thin layers, due to which it is possible to:

- to achieve specific uniform loading of the cones of the rotor, which contributes to an equal thickness of the layer of material on them;

- to achieve that the mixing process occurs at the level of microvolumes and individual particles.

Literature

1. A.S. USSR 997776, MKI B01F 7/26: B28C 5/16. Centrifugal mixer of powder materials / A.S. Kurochkin, V.N.Ivanets, G.S. Sulein, A.A. Krokhalev (USSR) - publ. in BI, 1983, No. 7.

2. A.S. RU 2174436, IPC C2 B01F 7/26. Centrifugal mixer of powder materials / G.G. Solomatin, V.I. Pyndak, 2000

Claims (1)

A centrifugal mixer containing a housing, a device for loading and unloading materials, a shaft, a rotor, consisting of three cones, a blade for unloading the mixture from the apparatus, characterized in that a conical knife with four cutting edges is located at the base of the inner cone, and on the upper edges of the middle outer cones installed four dispersing knives arranged in a checkerboard pattern.

Images