RU152869U1 - DISK GRINDER FOR ACTIVATION OF SUSPENSION - Google Patents

Abstract

1. A disk grinder for activating a suspension, comprising: a chamber (1) with inlet (2) and output (3) nozzles, a shaft (5) located in the chamber (1), rotatably mounted, centrifugal disks mounted on the shaft (5) (4) and fixed partitions (7) located between the disks passing from the walls of the chamber (7) to ensure that the peripheral parts of the disks (4) overlap. 2. The chopper according to claim 1, characterized in that it contains an additional shaft (8) installed in the chamber (1), on which centrifugal disks (4) are also placed. The chopper according to claim 2, characterized in that the shaft (5) and the additional shaft (8) are installed in the chamber (1) in parallel with the provision of a partial overlap of the surface of the centrifugal disks installed on the said shafts (4). 4. The chopper according to claim 3, characterized in that the shaft (5) and the additional shaft (8) are installed in the chamber (1) with the possibility of multidirectional rotation.

Description

The utility model relates to devices for producing a suspension with its simultaneous activation (grinding of solid fraction), namely to a disk grinder, and can be used in construction, production of building materials, coal energy, as well as other industries where suspensions are used.

A disk shredder is known from the prior art (see USSR author's certificate SU 1734826, 05/23/1992) containing a rotating shaft with disks installed in the grinding chamber, the disks being separated by vertical partitions connected to the chamber walls by means of springs and provided with holes and wavy recesses. Moreover, the shaft is made hollow with helical radial holes and recesses for grinding balls. During the operation of the device, the suspension enters the spaces between the disks and partitions. Vertical partitions, interacting through balls with a rotating shaft, begin to make oscillating movements, which ensures intensification of grinding. The disadvantage of this device is its complexity and low efficiency.

Disc grinders are known in the art for producing an activated suspension without the use of grinding balls. A device is known (see US patent US3536266, 10.27.1970 - the closest analogue) containing a grinding chamber with a rotating shaft placed in it, on which the disks are mounted. The suspension is loaded into the chamber and dispersed during the rotation of the disks, as a result of which the solid component is crushed due to the collision of the suspension with the surfaces of the disks and the chamber walls. However, this device also does not provide sufficient grinding efficiency.

The objective of the utility model is to eliminate the disadvantages of analogues.

The technical result of the utility model is to increase the efficiency of grinding solid particles of the suspension.

The specified technical result is achieved due to the fact that the disk grinder for activating the suspension contains a chamber with inlet and outlet nozzles, a shaft located in the chamber, rotatably mounted, centrifugal disks mounted on the shaft, and stationary partitions located between the disks passing from the chamber walls with providing overlapping peripheral parts of the disks.

In addition, the specified technical result is achieved in private options for implementing the utility model, due to the fact that:

- the chopper contains an additional shaft mounted in the chamber with centrifugal disks placed on it;

- the shaft and the additional shaft are installed in the chamber in parallel with the provision of partial overlap of the surface of the disks;

- the shaft and the additional shaft are mounted in the chamber with the possibility of multidirectional rotation.

In contrast to the known analogues, the claimed device has fixed partitions passing from the walls of the chamber to the center of the disks and partially overlapping the surfaces of the disks in their peripheral part. Due to this design, the grinding of the solid component of the suspension is carried out not only due to the collision of solid particles with the walls of the grinding chamber, but also due to the formation of turbulent zones of self-grinding. In this case, more intensive grinding of the solid component of the suspension occurs with its activation and heating. As a result, the productivity (efficiency) of the device and the degree of homogenization of the suspension are increased.

The utility model is illustrated by drawings, where:

in FIG. 1 shows a first embodiment of a device;

in FIG. 2 shows a second embodiment of a device;

in FIG. 3 shows an embodiment of using the device in combination with an impeller or disk pump;

in FIG. 4 shows the grinding scheme in the processing zone of the suspension.

The claimed device according to the first embodiment of the utility model (Fig. 1) is a single-rotor grinder containing a grinding chamber (1) with inlet (2) and output (3) nozzles and centrifugal disks (4) mounted in the chamber (1) coaxially on shaft (5) with a drive (6) of rotation. The disks (4) are separated by solid fixed partitions (7) extending from the walls of the chamber (1) to the center of the disks (4) and overlapping the peripheral parts of the disks (4), but not overlapping their remaining parts.

The claimed device according to the second embodiment of the utility model (Fig. 2) is a two-rotor chopper and, in addition to the design according to the first embodiment, contains an additional second shaft (8) with a drive (9). Centrifugal disks (4) are also placed on the additional shaft (8), while the shafts (5) and (8) are installed in the chamber (1) in parallel with the partial overlapping of the surface of the disks (4). These shafts (5) and (8) rotate in different directions.

In the first and second variants, the shafts (5) and (8) can be oriented both horizontally and vertically.

The processed suspension (Fig. 3) can be fed into the grinding chamber (1) by a centrifugal impeller or disk pump (10) through an accelerating nozzle (11) connected to the inlet pipe (2) (see Fig. 3).

The device operates as follows.

The processed suspension through the inlet pipe (2) is fed into the chamber (1). The suspension, falling onto the rotating disks (4), is discarded to the periphery under the action of centrifugal force. An annular treatment zone (12) is formed in the peripheral part, where pressure P = m _a / S is created, where m _a is the suspension mass, and S is the total area of the boundary layer in which the pressure is increased (see Figs. 1, 2). Pressure P depends on the geometric dimensions of the grinding chamber, the diameters of the disks, the density of the suspension and the speed of rotation of the shafts of the drives. Due to the presence of partitions (7) in the indicated zone (12), the suspension flow discharged to the periphery collides with the oncoming flow of the suspension already processed (see Fig. 4). Moreover, taking into account the viscous friction forces, the suspension layers adjacent to the disk (4) have velocities relatively close to the speed of the disk points on the abutment surface, and the speed of the layer adjacent to the partition (7) tends to zero. Due to this, in the spaces between the disks (4) and partitions (7), turbulent zones (13) are formed in which active self-grinding of the suspension occurs (see Fig. 4).

The suspension particles that are largest and heaviest at the moment of processing are not able to leave the treatment zone (12) due to the action of centrifugal forces, which ensures guaranteed grinding.

In the case of the second variant of the device (see Fig. 2), in addition to the processes described above, in the overlap zone (14) of the surface of the disks (4) of the shafts (5) and (8), the suspension is pressed into the gap between the disks (4) by the action of centrifugal force that provides a counter collision of flows with a speed equal to the sum of linear and centrifugal speeds of grinding disks. Thus, in this embodiment of the utility model, grinding occurs most intensively.

In the grinding process, the volume of suspension is regulated to ensure a given load. The distance between the disks (4), as well as the distance between the walls (4), is selected based on the properties of the suspension.

The suspension can be supplied to the chamber from the sand outlet of the hydrocyclone.

Optionally, grinding can be carried out cyclically: after removing the suspension, it is returned to the grinder chamber, processing to obtain the required size of the solid component.

Further, for example, disclosed technology for the preparation of concrete mixtures using the claimed device.

To prepare the concrete mixture, first, according to the described technology, a suspension is prepared from dosed in the required proportion of water and a binder capable of hydration (cement, granulated slag, clinker with gypsum, etc.). During the operation of the device, the necessary grinding of the binder occurs, activation and homogenization to form a homogeneous suspension (cement paste). Then the cement paste is fed into a concrete mixer and kneaded with aggregates.

The proposed device provides an increase in the degree of activation of the concrete mixture, rate of hardening, a more complete passage of the cement hydration process, reduction in the consumption of binder and the cost of preparing the concrete mixture by eliminating the clinker from the technological process of fine grinding of clinker in cement plants and storing cement directly in moisture-proof storages until use.

Similar to the process of preparation of cement paste, drilling and other special solutions are prepared, the preparation of which requires dispersion and homogenization.

The proposed device can be used:

- in the production of concrete mixtures and products from them;

- in the manufacture of cellular concrete;

- for the preparation and weighting of drilling fluids;

- for the preparation of water-coal and water-peat fuel.

Thus, in the claimed device there is an intensive grinding of the solid component with activation and heating. In fact, fine grinding of the solid component is carried out in conjunction with intensive homogenization. By adjusting the speed of rotation of the rotors, the gap between the centrifugal disks and the baffles, it is possible to obtain the required suspension processing parameters with high accuracy. The proposed device is simple, high productivity and efficiency due to the absence of grinding media and wearing parts, as well as the ability to control the degree of grinding.

Claims (4)

1. A disk grinder for activating a suspension, comprising: a chamber (1) with inlet (2) and output (3) nozzles, a shaft (5) located in the chamber (1), rotatably mounted, centrifugal disks mounted on the shaft (5) (4) and fixed partitions (7) located between the disks passing from the walls of the chamber (7) to ensure that the peripheral parts of the disks (4) overlap. 2. The chopper according to claim 1, characterized in that it contains an additional shaft (8) installed in the chamber (1), on which centrifugal disks (4) are also placed. 3. The chopper according to claim 2, characterized in that the shaft (5) and the additional shaft (8) are installed in the chamber (1) in parallel with the provision of a partial overlap of the surface of the centrifugal disks (4) mounted on the said shafts. 4. The chopper according to claim 3, characterized in that the shaft (5) and the additional shaft (8) are installed in the chamber (1) with the possibility of multidirectional rotation.

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