RU2504435C1 - Multichamber mill - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to processing of loose materials and can be used in construction and chemical industry, etc. Mill comprise housing 1 composed by interconnected elastic torus-like chambers with lifters 8 and material feed and discharge pipes 8, 9. Said chambers are separated by inner perforated baffles coupled by screw from outside. Housing 1 is filled with grinding bodies, their sizes sequentially decreasing from feed chamber to discharge chamber Chambers are asymmetrically deformed by baffles 3 coupled in staggered pairs by extra screws 7.

EFFECT: higher efficiency of grinding.

3 dwg

Description

The invention relates to a device for grinding bulk materials. The proposed multi-chamber mill is mainly intended for grinding bulk materials in the construction industry, the production of asphalt concrete, powder paints, as well as in the mining and metallurgical and a number of chemical industries.

A known mill containing a housing in the form of a cylindrical container, in which grinding bodies are placed, material loading and product unloading nozzles, as well as an air supply pipe located on the material supply side (ed. St. USSR No. 1502092, class B02C 17/04, BI No. 31, dated 08.23.1989). The disadvantages of this mill include the low grinding efficiency due to the lack of separation of the chamber into sections, which would improve the grinding conditions during the step-by-step processing of components, as well as the high noise level of the mill during its operation.

Known tube multi-chamber mill containing a housing in the form of a tank divided by diaphragms into cylindrical chambers of coarse, medium and fine grinding, in which grinding bodies are placed, having sizes that are gradually decreasing from the loading chamber to the unloading chamber, the drive, material loading nozzles and product unloading (automatic St. No. 1103895, class B02C 17/06, 1981).

The disadvantages of this mill include the relatively low grinding efficiency due to the low pulsation of the speeds of the material and grinding media, a high level of noise during its operation, as well as over-grinding of the material due to the lack of effective removal of the product from the grinding zone.

The closest in design features to the proposed one is a multi-chamber mill containing a housing consisting of sequentially fastened elastic mountain chambers with lifters filled with grinding media, the dimensions of which are successively reduced from the loading chamber to the discharge chamber, and separated by perforated partitions connected from the outside by couplers, as well as nozzles for loading material and unloading the product and drive (RF patent No. 1813015, BI No. 16 of 04/30/91).

During the operation of the mill, the components to be crushed through the loading nozzle are continuously fed into the coarse grinding chamber, in which, when the casing is rotated, it is exposed to large grinding media and also self-crushed. The use of elastic mountain chambers allows to reduce the noise level and increase the grinding efficiency by increasing the intensity of pulsations of grinding media.

The disadvantages of this mill include the relatively low grinding efficiency due to the low pulsation of the velocities of the material and the grinding media in the axial direction, since the shape of their cross section during operation of the mill remains unchanged. In addition, the lack of active removal of the product from the grinding zone is the reason for its overgrinding and also reduces the efficiency of the process.

The problem solved by the invention is to increase the efficiency of the grinding process.

The problem is solved due to the fact that in a multi-chamber mill containing a housing consisting of sequentially fastened elastic mountain chambers with lifters filled with grinding bodies, the dimensions of which are successively reduced from the loading chamber to the unloading chamber, and separated by perforated partitions connected from the outside by couplers, and also the nozzles for loading material and unloading the product and the drive, the chambers are asymmetrically deformed by partitions, which are connected in pairs, in a checkerboard pattern, using additional couplers, and the housing is in communication with the air supply pipe.

Figure 1 shows a longitudinal section of a multi-chamber mill; figure 2 is a section aa in figure 1; figure 3 - view B of the multi-chamber mill in figure 1

The proposed multi-chamber mill comprises a housing 1, consisting of sequentially fastened elastic mountain chambers with lifters 2, separated by internal perforated partitions 3, which are connected externally by couplers 4, passing through the holes of the partitions 3 with a gap and tightening the external perforated partitions 5 and 6. Chambers 1 are asymmetrically deformed by partitions, which are staggered in pairs in a checkerboard pattern with the help of additional threaded ties 7. The material loading pipe 8 is installed in accordance with and housings and partitions 5. The discharge pipe 9 is installed under the discharge pipe 10. The housing is filled with grinding media, the dimensions of which are successively reduced from the loading chamber to the discharge chamber and mounted on roller bearings 11, one of which is connected to the drive and carries an air supply pipe 12. (Grinding bodies and drive are not shown in FIGS. 1-3). The partition 6 is in contact with the stop 13, limiting the longitudinal movement of the housing.

During the operation of the mill, the crushed material is fed through the pipe 8 into the first chamber of the housing 1 — the coarse grinding chamber, where it is crushed by grinding bodies and self-crushed to sizes smaller than the holes of the partition 3. The smallest particles (part of the crushed fraction) are removed from the crushing area (chambers) ) air, which is supplied with the necessary speed through the pipe 12. The remaining particles through the openings of the partition 3 between the chambers enter the finer grinding chamber, where they are crushed by smaller grinding media sizes. The processes occurring in this and in the following chambers do not qualitatively differ from the processes occurring in the coarse grinding chamber. Reducing the size of the grinding media from the loading chamber to the discharge chamber provides the conditions for finer grinding in each subsequent chamber. When the housing 1 rotates, the cross-sectional area of the mixture of material and grinding media constantly changes due to asymmetric deformation of the housing chambers with additional ties 7. This leads to additional pulsation of the grinding media and material velocities and increases grinding efficiency. From the last chamber of the housing 1, the product through the pipe 10 enters the discharge pipe 9.

The smallest particles, together with air, are removed from the mixture stream through an aspiration system and a cyclone (not shown).

The use of additional couplers in the proposed multi-chamber mill in pairs, staggered to connect the partitions, provides an asymmetric deformation of the elastic chambers of the housing, which, when rotated, leads to a constant change in the cross-sectional area of the mixture of material and grinding media, the appearance of additional pulsations of their velocities and an increase in grinding efficiency.

The use of an air supply pipe in this mill in combination with additional screeds in pairs, staggered connecting the partitions and asymmetrically deforming the elastic chambers, increases the grinding efficiency due to the more intensive removal of small particles together with air and eliminates overgrinding of the material. This is due to the fact that the additional pulsation of the velocities of the particles of the material that occurs when the above-mentioned structural elements of the measures are combined also ensures their more intensive circulation and increase in the speed of updating the contact surfaces of the phases (small particles with the air flow).

Claims (1)

A multi-chamber mill comprising a housing consisting of sequentially fastened elastic toroidal chambers with lifters filled with grinding media, the dimensions of which are successively reduced from the loading chamber to the unloading chamber, and separated by perforated partitions connected externally by couplers, as well as material loading and product unloading nozzles and a drive , characterized in that the chambers are asymmetrically deformed by partitions, which are paired in a checkerboard pattern using additional couplers, and AA communicates with the air supply pipe.

Images