RU1782178C - Laboratory classifier - Google Patents

Abstract

Using the determination of the frictional composition of the crushed particles of the material according to their dimensional characteristics. SUMMARY OF THE INVENTION The classifier comprises a housing with screens mounted on vertical elastic springs mounted on a base, and a vibration exciter of vibrations of the housing in a horizontal plane. Springs are installed inside vertical cups (C), fixed on the base, and sandwiched between bolts screwed into through threaded holes in walls C. The holes are made in several rcd in height C 1 s. P. f-ly, 2 ill.

Description

The invention relates to devices for determining the fractional composition of the crushed particles of the material according to their dimensional characteristics

A device for classifying materials is known, including a housing with sieves suspended on rods with springs, two vibration exciters with rotors rotating with different frequencies.

The disadvantage of this device is the low range of use due to the inability to classify particles of elongated material

Complex vibrations, i.e., vibrations both in the vertical and in the horizontal plane, the dominant of which are the first ones, tested by the classifier body, are transmitted to the particles of material located on the sieves, while the particles detached from the sieves tend to occupy a vertical position and when they fall

pass through the openings of the sieves, with particles having a larger linear size pass through the small sizes of the openings of the sieves. Thus, the selection of particles by dimensional characteristics is violated.

Known flat screening comprising a housing, mounted on packages of supports connected to the sides of the housing using fasteners, two stacks of screens, a vibrator with a drive. This device is the closest to the proposed technical essence and the achieved result.

The disadvantage of this device, as well as the device described above, is its low range of use due to the impossibility of classifying particles of elongated materials with different physicomechanical properties, since the angle of inclination of the screens is constant.

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The aim of the invention is to expand the range of use of the classifier with the possibility of classifying particles of not only granular material, but also materials having an elongated shape with different physical and mechanical properties.

This goal is achieved by the fact that the known device, consisting of a housing with sieves and exciters, is mounted on vertical elastic springs mounted on the base by means of vertical glasses and bolts screwed into through threaded holes in their walls, while the springs are located inside the glasses between the bolts and threaded holes are made in several rows along the height of the glasses.

In addition, each sieve is mounted on a horizontal shaft that can be rotated, levers are fixed on the shafts, which are pivotally connected to a common rod, and a shaft rotation angle indicator is mounted on one of the shafts outside the housing.

In FIG. 1 shows the proposed classifier; in FIG. 2 - the same, longitudinal section.

The classifier contains a base 1 on which through the flat spring-elastic vertical springs 4 a classifier housing 5 is mounted. In the classifier housing 5 sieves 14 with bottoms 15 are fixed, located one below the other. To feed the crushed particles to each subsequent sieve there are pitched boards 16, the angles of inclination of the bottom 15 and pitched boards 16 are greater than the angle of repose for the classification of bulk materials and the friction angle for the classification of crushed particles of roughage, and in the latter case the surface of the sieves and pitched boards are corrugated , in a trapezoidal cross section with a smaller base facing down, this was done in order to give direction to the movement along the screen with openings of crushed particles of roughage having an elongated shape at.

The collection of each fraction from the bottom 15 is carried out in separate boxes 20 sitting freely in the guides 19 of the classifier housing 5.

To the front ends of the sieves 14, shafts 13 are rigidly fixed, pivotally seated in the walls of the housing 5. On one of the ends of the shafts 13, levers 8 are rigidly mounted pivotally connected to the other ends with a vertical rod 10, which in turn is connected with nuts 11 and 12 to slabs 9 rigidly fixed to the casing of the classifier 5. To control the angle of inclination of the sieves 14 on one of the shafts outside the casing 5 there is a pointer 7 of the angles of rotation of the shaft, and a graded sector 6 is applied to the casing 5 of the classifier

The oscillation amplitude of the classifier housing 5 is controlled by means of bolts 3 screwed into the walls of the cup 2 by moving them in height. The diameter of the stack 0 to 2 is selected taking into account the maximum amplitude of the shell oscillation

classifier 5 with the lower position of the bolts 3.

In the lower part of the housing of classifier 5 on frame 17, an oscillation agent 18 is mounted with a load on the shaft mounted with eccentricity and rotating in a horizontal plane.

The working process in the classifier proceeds as follows: the material is placed in front of the upper sieve 14, which is pre-adjusted to a certain angle of inclination depending on the physicomechanical properties of the material using nuts 11 and 12, for which it is necessary to unscrew the lower nuts 12 and rotation of the upper nut 11 sets the desired angle of inclination of the sieves 14 and then, by tightening the nuts 12, the position of the link 10 is fixed 10. The drive 18 is turned on and under the action of vibrations caused by rotation of the shaft with loads the material begins to move along the surface of the sieve in a thin layer. As the material moves, particles smaller than the size of the openings of the sieve 14 are sieved through them and fall on the bottom 15. Due to the fact that the angle of inclination of the bottom is much larger than the angle of repose at

0 classification of bulk materials and the angle of friction in the classification of materials having an elongated shape, the particles roll along the surface of the bottom 15 and are collected in the upper box 20. Particles

5 of the material having large sizes of the openings of the sieve 14, when they move, they fall onto the ramp board 16 and then onto the next sieve and then the classifier working process is repeated 0.

The use of the proposed classifier significantly increases the range of classifications of materials by dimensional characteristics with

5 various physical and mechanical properties.

Claims (1)

SUMMARY OF THE INVENTION 1. Laboratory classifier, comprising a housing with sieves mounted on vertical elastic springs mounted on the base, and a horizontal vibration exciter of the housing, characterized in that, in order to increase the classification efficiency by providing the possibility of controlling the oscillation mode, the springs are fixed to the base by means of vertical cups mounted on the base and bolts screwed into through threaded holes in the walls of the cups, with the springs located enes inside the cup between 0 bolts, and threaded holes made in several rows along the height of the glasses. 2, the Classifier according to claim 1, with the exception that each sieve is mounted on a horizontal shaft mounted in the housing with the possibility of rotation, levers are fixed on the shafts, which are pivotally connected to a common link , and on one of the shafts outside the casing there is a shaft turn indicator. f. "% - - tSfrf & azf QJuz.L ILJ &, #w