RU209700U1 - vibrating mixer - Google Patents

Abstract

The utility model relates to kneading machines for high-viscosity media and can be used in food, chemical, petrochemical, construction, pharmaceutical and other industries, as well as in environmental processes for processing high-viscosity, non-Newtonian thixotropic structured liquid waste during their disposal. The technical result of the proposed design vibratory mixer is to increase productivity. The technical result is achieved by the fact that the vibratory mixer, consisting of: a frame on which an electric motor with a gearbox is placed, connected through an elastic coupling with two shafts with blades located inside the mixing chamber, equipped with a lid, a funnel for supplying the starting components and a branch pipe for removing the mixing products, a vibrator drive connected through an elastic coupling to a shaft on which the vibrator is fixed in the form of a mass with imbalances, and helical springs on which the vibrator is installed, characterized in that the spiral The springs are made conical, with variable elasticity of the coils, while the smallest elasticity of the coils is determined by the expression (1), where a1 is the smallest elasticity of the coils of each conical spring, N/m; n is the frequency of rotation of the vibrator shaft with imbalances, rpm; m - the total mass of the vibrator shaft with imbalances, the kneading chamber with a cover, two shafts with blades, a funnel for feeding the initial components and a branch pipe for removing the mixing products, kg; N is the number of conical springs; the highest elasticity of the conical spring turns is determined by expression (2), where a2 the greatest elasticity of the coils of each conical spring, N/m; Δm is the largest mass of components in the kneading chamber, kg.

Description

The utility model relates to kneading machines for high-viscosity media and can be used in food, chemical, petrochemical, construction, pharmaceutical and other industries, as well as in environmental processes for processing high-viscosity, non-Newtonian thixotropic structured liquid waste during their disposal.

A vibratory mixer is known, containing a working chamber supported through shock absorbers on a frame, a vibrator, inlet and outlet pipes of the mixed components, an internal working surface rigidly mounted in the center of the working chamber base, in which the working surface is made in the form of a cylindrical rod with a free movement along the rod with a spring beater [RF Patent No. 2188063, B01F 11/00, publ. 27.08.2002].

The disadvantage of such a vibratory mixer is the impossibility of mixing highly viscous non-Newtonian media, which is associated with sticking of these media to the spring beater.

Known vibrocontinuous mixer containing a fixed housing with loading and unloading windows, installed in the supports of a hollow shaft with helical blades and a drive element, a drive unbalanced shaft installed inside the hollow shaft and made in the form of a planet carrier with a variable length from the loading window to the unloading window eccentricity , at the ends of which the supports of the hollow shaft are installed [USSR Patent No. 533384, B01F 11/00, B 28C 5/14 publ. October 30, 1976].

The reasons hindering the achievement of the desired technical result include the sticking of the components of the mixed media on the helical blades and the surface of the hollow shaft.

Known paddle vibromixer brand ShVS, designed for mixing the components of the recipe mixture in the confectionery industry. It consists of a frame in which a motor is installed, connected to an unbalanced vibrator. The vibrator is fixed in the frame on springs resting on the frame. A kneading chamber is installed on the upper part of the frame, inside which two shafts with blades are installed. The rotation of the shafts with blades is carried out from an electric motor with a gearbox through a flexible coupling. The chamber is equipped with a lid, a funnel for supplying the starting components and a gas mixture outlet pipe [Machines and apparatus for food production. Book 1 / Edited by V.A. Panfilova/. - M .: Higher School, 2001, 703 pp., pp. 616 and 617].

The reasons hindering the achievement of the desired technical result include the sticking of highly viscous components of the stirred medium on the blades and the surface of the kneading chamber with the formation of a drying crust with high adhesive properties. This leads to the need to periodically stop the main cycle of work and the time spent on cleaning the above surfaces, which generally reduces productivity.

The technical result of the proposed design of the vibromixer is to increase productivity.

The stated technical result is achieved by the fact that the vibratory mixer, consisting of: a frame on which an electric motor with a gearbox is placed, connected through an elastic coupling with two shafts with blades located inside the kneading chamber, equipped with a lid, a funnel for supplying the starting components and a pipe for removing the mixing products , a vibrator drive connected through an elastic coupling to a shaft on which the vibrator is fixed in the form of a mass with imbalances, and helical springs on which the vibrator is installed, characterized in that the helical springs are made conical, with variable elasticity of the coils, while the smallest elasticity of the coils is determined expression

(1),

(one),

where a ₁ - the smallest elasticity of the coils of each conical spring, n / m;

n is the frequency of rotation of the vibrator shaft with imbalances, rpm;

m is the total mass of the vibrator shaft with imbalances, the kneading chamber with a cover, two shafts with blades, a funnel for supplying the initial components and a branch pipe for removing the mixing products, kg;

N is the number of conical springs;

the greatest elasticity of the coils of a conical spring is determined by the expression

(2),

(2)

where a _{2 -} the greatest elasticity of the coils of each conical spring, n / m;

Δm is the largest mass of components in the kneading chamber, kg.

Installation instead of cylindrical springs with the same elasticity of the coils along the height of conical springs with variable elasticity of the coils along the height allows you to provide resonant modes of oscillation with a high amplitude of the kneading chamber with mixed components of the mixture at any mass in the kneading chamber. This prevents the components from sticking to the walls of the kneading chamber and the surfaces of the blades and increases the mixing speed, which generally leads to an increase in productivity [V.D. Varsanofiev, E.E. Kalman-Ivanov. Vibration technology in the chemical industry. - M: Chemistry, 1985, 240 pp., pp. 206-207].

The implementation of the turns of the conical spring with the lowest elasticity of the turns, determined by expression (1), makes it possible to provide a resonant oscillation mode with a large amplitude at the initial moment of loading the components of the mixed medium, when their mass is minimal, and the presence of turns in the conical spring with the highest elasticity, determined by the expression (2 ), provides a resonant oscillation mode with a large amplitude with the largest mass of the mixture components located in the kneading chamber.

Each conical spring with a part of the total mass distributed to it is a spring pendulum with a natural frequency

(3)

(3)

[Yavorsky B.M., Detlaf A.A. Handbook of physics for engineers and university students.-M: State edition of physical and mathematical literature, 1963, 847 pp., p. 102],

where ν is the natural frequency of the spring pendulum, Hz;

but – elasticity of the coils of the spring, n/m;

M is the weight of the load on the spring, kg.

When the equality of the frequency of rotation n of the unbalanced shaft and the natural oscillation frequency ν of the spring pendulum is fulfilled, we obtain the desired expressions (1) and (2) for the elasticity of the coils of the conical spring, which provides resonant oscillations with a large amplitude over the entire range of possible changes in the mass of the mixed components in the kneading chamber. This allows you to maintain a high mixing speed of these components and prevent particles from sticking to the surface of the kneading chamber and mixer blades, which contributes to increased productivity.

The drawing shows a General view of the proposed design vibromixer. It consists of a frame 1, on which an electric motor 2 with a gearbox 3 is placed. Two flexible couplings 4 are installed on the shaft of the gearbox 3 with the ability to provide vertical vibrations in addition to torsional vibrations.

The free ends of both flexible couplings 4 are connected by two shafts 5, on which the mixing blades 6 are fixed. 10 to remove the products of mixing. Under the kneading chamber 7 in the casing 11, a vibrator 12 is fixed in the form of a mass with imbalances. The shaft of the vibrator 12 is connected by a flexible coupling 13 to the drive 14. The casing 11 is supported by conical springs 15, the smallest and largest elasticity of which is described by expressions (1) and (2).

Vibromixer works as follows. The electric motor 2 is turned on, which, through the gearbox 3 and flexible couplings 4, transmits torsional vibrations to two shafts 5 with mixing blades 6. At the same time, the drive 14 is turned on, which, through the flexible coupling 13, transmits torsional vibrations to the vibrator 12 with a speed of rotation n. Through the funnel 9 inside the kneading chamber 7 served on the rotating blades 6 components of the mixture. Rotating blades 6 move the components of the mixture from the funnel 9 to the nozzle 10 and take them out of the kneading chamber 7 to the outside. Simultaneously with mixing, the mixture components in the kneading chamber 7 perform vertical oscillations in a resonant mode with a large amplitude, since for any mass of the mixed components from the smallest m, when the mode of supplying the mixture components inside the kneading chamber 7 begins and the vibrating mass consists of a kneading chamber 7 with a cover 8, funnel 9, pipe 10, two shafts 5 with mixing blades 6, casing 11 of the vibrator and the vibrator 12 itself, up to the largest m + Δm, when the largest mass of the mixed components is added to the above masses, coils of conical springs with an elasticity range from a ₁ to and ₂ provide the above-described resonant mode of oscillation of the stirred components inside the kneading chamber 7 with a large amplitude. This, firstly, intensifies the mixing process, and, secondly, prevents the mixture components from sticking to the walls of the mixing chamber 7 and blades 6, which leads to an increase in productivity.

Thus, the design of the helical springs on which the vibrator is installed, conical, with variable elasticity of the coils, the smallest and largest value of which is determined by expressions (1) and (2), respectively, reduces the possibility of sticking of the components of the mixed medium to the surface of the blades and the walls of the kneading chamber, increases mixing speed, which generally increases productivity.

Claims (10)

Vibromixer, consisting of: a frame on which an electric motor with a gearbox is located, connected through an elastic coupling with two shafts with blades located inside the kneading chamber, equipped with a lid, a funnel for supplying the starting components and a pipe for removing the mixing products, a vibrator drive connected through an elastic a coupling with a shaft on which a vibrator is fixed in the form of a mass with imbalances, and coil springs on which a vibrator is installed, characterized in that the coil springs are made conical, with variable coil elasticity, while the smallest coil elasticity is determined by the expression

, where a ₁ - the smallest elasticity of the coils of each conical spring, n / m; n is the frequency of rotation of the vibrator shaft with imbalances , rpm; m is the total mass of the vibrator shaft with imbalances, the kneading chamber with a cover, two shafts with blades, a funnel for supplying the initial components and a branch pipe for removing the mixing products, kg; N is the number of conical springs; the greatest elasticity of the coils of a conical spring is determined by the expression

, where a _{2 -} the greatest elasticity of the coils of each conical spring, n / m; Δm is the largest mass of components in the kneading chamber, kg.

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