RU2399486C1 - Device for concrete mix mixing - Google Patents

Abstract

FIELD: technological processes.

SUBSTANCE: invention relates to devices for mixing of concrete mix and may be used in construction materials industry, in construction and other fields of construction industry to produce polydisperse materials. Device for mixing of concrete mix comprises mixing chamber, rotor with rotation drive and blades, vibrator fixed rigidly in the centre of mixing chamber and axis, and plate springs and shock absorbers are placed on it with gap. Vibrator is arranged with support orifices of large and small diametre, at the same time plate springs and shock absorbers are placed on axis in the following order: plate spring, support orifice of larger diametre, rubber shock absorber, support orifice of larger diametre, plate spring, support orifice of smaller diametre, rubber shock absorber, support orifice of smaller diametre.

EFFECT: invention will make it possible to increase efficiency of mixing.

2 dwg

Description

The invention relates to batch mixers and can be used in the construction materials industry, in construction and other areas of the construction industry for the production of polydisperse materials.

Various methods and devices for mixing concrete are known in the art.

For example, there is a known method of mixing concrete mixture (Patalashvili T.N., Tatishvili A.Z., Tsilosani Z. N. Vibro-mixing of concrete mixtures. - Tr. NIIZhB, 1961, issue 21, p. 35-41), including rotation operations mixes in a serial S-355 concrete mixer, providing a vibrating effect to the concrete mixture by means of a package of deep vibrators operating in the frequency range of 3000-6000 vibrations per minute.

The disadvantages of this method include low productivity, a high degree of wear of the bearing assemblies.

Also known is a method of vibro-mixing a concrete mixture (Subbotkin M.I., Trinker V.L. Vibro-mixing of mortars and concrete. Riga, 1961, p. 71-85), including the operation of rotation of the blades of the mortar mixer, the excitation of vibration in the blades by rotating the unbalanced shaft.

The disadvantages of this method include significant energy consumption for the rotation of the blades and the unbalanced shaft, low productivity, as well as a high percentage of wear of the bearing assemblies.

Known rotary mixer with a mechanical vibration exciter containing a mixing chamber and a vibrator, made in the form of disk springs with rubber shock absorbers. The vibrator is rigidly fixed in the middle of the mixing chamber and has a crank mechanism, with the help of which the Belleville springs excite particle vibrations in the horizontal direction. In the mixer, it is possible to adjust the vibration intensity by changing the rotational speed of the crank mechanism drive (Patent RU 2297274 C1, 04.20.2007, B01F 11/00).

The disadvantages of the known design include significant energy consumption for the deformation of the Belleville springs, inefficient vibrator design, leading to low productivity, as well as a high percentage of wear of rubber shock absorbers.

The technical result of the invention is to optimize the design of the mixer, aimed at increasing the efficiency of mixing, reducing energy consumption during the production of vibration effects on the processed mixture, increasing the productivity of the mixer.

The technical result in relation to the method is achieved by the fact that in our method the operation of rotation of the mixer blades is performed, and to excite the vibration, the operation is performed to deform the spring-loaded vibrator in the vertical direction, the vibration amplitude being 0.5 millimeters.

The technical result with respect to the device is achieved by the fact that the device containing the mixing chamber, a rotor with a rotary drive, made with blades, a vibrator, which is an axis with elements seated on it with a gap and in the following order: disk spring, thrust washer of larger diameter ( washer 1), rubber shock absorber, washer 1, Belleville spring, thrust washer of smaller diameter (washer 2), rubber shock absorber, washer 2, is rigidly fixed in the middle of the mixing chamber. The design has a crank mechanism, with the help of which the deformation of the vibrator is carried out by means of the lid, as a result of which particle vibrations in the horizontal direction are excited.

The invention is illustrated by the images in figure 1 shows a schematic diagram of a rotary mixer with a disk-spring exciter, figure 2 is a diagram of a disk-spring vibrator.

The mixer comprises a mixing chamber 1, a rotor 2, made with blades 3, 4. The rotor 2 has a rotation drive 5. A vibrator 6 is installed in the center of the mixing chamber 1 with mechanical excitation of vibrations from the crank mechanism 7. The vibrator 6 is an axis 16 with elements seated on it with a gap and in the following order: disk spring 9, thrust washer of a larger diameter (washer 1) 10 , rubber shock absorber 11, washer 1 10, Belleville spring 9, thrust washer of smaller diameter (washer 2) 12, rubber shock absorber 11, washer 2 12. The crank mechanism 7 has the ability to exert a deforming effect on the vibrator 6 through the cover 8. The cover 8 is attached to the crank mechanism 7 by a bolt connection 13. The mixer also has windows 14 and 15 for loading and unloading materials, respectively.

The essence of the method of mixing the concrete mixture is that when the vibrator 6 is deformed, a vibration field is excited that destroys the core of immiscibility, which ensures uniform mixing of the mixture.

The device operates as follows: the drive 5 rotates the rotor 2 and the blades 3, 4, thereby mixing the prepared mixture. The crank mechanism 7 has a deforming effect on the disk springs 9, washers 10, 12, rubber shock absorbers 11 by means of a cover 8 attached to it by a bolt connection 13, thereby forcing them to oscillate in the reciprocating direction, exciting oscillations of the particles of the mixture in horizontal direction. In general, the design of the mixer allows you to intensify the mixing process while reducing energy losses due to the rotation of the rotor 2, due to a decrease in the resistance to movement of the blades 3 and 4, increased mobility and turbulization of the mixture in the entire volume of the chamber of the mixer 1.

In general, the design of the mixer allows you to increase productivity and reduce energy costs for the mixing process of particularly hard concrete mixtures, due to the fact that with the oscillatory movement of the vibrator with an amplitude value of vibration acceleration of 180 ... 250 m / s ² there is a more uniform thixotropic destruction of the material structure in the entire chamber space mixing, which manifests itself in a decrease in viscosity of 50 ... 60 times or more compared with the viscosity of the known non-destroyed material. In this regard, the resistance to movement of the blades and the power consumption of the rotor rotation drive are reduced. At the same time, the effect of vibro-boiling of the mixture under the influence of the oscillatory movement of the vibrator disk is achieved, greater turbulization and more intensive circulation of the particles of the mixture, as a result of which the mixing time is reduced, and the mixer productivity is increased. In addition, the proposed design of the vibrator can reduce energy consumption during the production of vibrational effects on the processed mixture due to the fact that the main deforming effect created by the crank mechanism is perceived by elastic rubber shock absorbers.

Claims (1)

A device for mixing concrete mixture containing a mixing chamber, a rotor with a rotary drive, made with blades, a vibrator with an axis rigidly fixed in the center of the mixing chamber with a disk spring and shock absorbers mounted on it with a gap, characterized in that the vibrator is made with larger thrust washers and smaller diameter, with Belleville springs, shock absorbers placed on the axis in the following order: Belleville spring, thrust washer of larger diameter, rubber shock absorber, thrust washer of larger diameter, t relchataya spring thrust washer of smaller diameter, the rubber damper thrust washer smaller diameter.

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