RU117326U1 - INSTALLATION FOR FRACTIONATION OF BULK POLYDISPERSION MATERIALS - Google Patents

Abstract

Installation for fractionation of bulk polydisperse materials, containing a sieve box, inclined sieves installed in it with a tiered arrangement, characterized in that each of the sieves is connected to the sieve box by means of adjusting supports that provide a change and fixation of the angle of inclination of each sieve independently of other sieves within from 1 ° to 15 °.

Description

The apparatus for fractionation of bulk polydisperse materials can be used as technological equipment for fractionation according to the particle size criterion of bulk and granular materials in the pulp and paper industry at the stage of the wood preparation cycle for sorting wood chips, in the production of building materials, in the beneficiation of ore and non-metallic materials .

Known installation, which contains connected to the sieve box inclined flat sieves with their tiered layout, and the sorting surface of the sieves of all tiers are parallel, and the angle of inclination of all sieves is rigidly connected with the angle of inclination of the sieve box. See RF patent No. 2047399 [1].

In the above installation, it is not possible to separately adjust the angle of inclination of the sieve of each tier, which limits the possibility of improving the quality of fractionation of bulk material, and also increases the time spent on the process of fractionation and reduces the productivity of the equipment.

Also known installation, which contains connected to the sieve box inclined flat sieves with their tiered layout, and the angle of inclination of all sieves is rigidly connected with the angle of inclination of the screen box. See work: Akhmadiev F.G., Gizzatov R.F. Mathematical modeling and optimization of the processes of separation of dispersed materials on multilevel sieve classifiers // Bulletin of Kazan State University of Architecture and Civil Engineering. 2011. No4. S. 330-340 [2].

This installation does not provide for separate adjustment of the angle of inclination of the sieves of each tier, which limits the possibility of improving the quality of fractionation of bulk material, and also increases the time spent on the process of fractionation and reduces the productivity of the equipment.

Also known is a plant for sorting wood chips, comprising at least two screens installed on top of each other, characterized in that the length of the sorting surface of the sieve of the upper level is in the range from 70% to 90% of the length of the sorting surface of the following sieve. This installation is also characterized in that the length of the sorting surface of each sieve of the second and subsequent levels is in the range from 70% to 100% of the length of the sorting surface of the following sieve. See RF patent No. 109025 [1].

This installation does not provide for adjusting the angle of inclination of the sieves of each tier separately, which limits the possibility of improving the quality of fractionation of bulk material.

The reason for the disadvantages of the known installations is that, depending on the composition of the fractioned material, it may be necessary to change the speed of movement of the bulk material on each sieve independently of other sieves, which is not feasible in known installations, since a simultaneous change in the angle of inclination of all sieves due to a change in the angle of inclination of the sieve box. The change in the rate of movement of bulk material along the sieve is carried out by adjusting the angle of inclination, since the movement of bulk material along the inclined surface of the sieve is influenced by the gravity of the particles of the bulk material, and the vibration effect on the sieve box, and therefore on the sieve and the particles of bulk material. In known installations, these opportunities are not used to increase the quality of fractionation, reduce the time spent on the implementation of this process and thereby increase the productivity of the installation.

In the proposed installation, the technical result is to increase the quality of fractionation, to reduce the time spent on the implementation of the process and to increase due to this the productivity of the equipment.

The specified technical result is achieved by the fact that in the proposed installation, the sieves of each tier are connected to the sieve box by means of adjusting supports that provide for changing and fixing the angle of inclination of each sieve independently of other sieves in the range from 1 ° to 15 °.

The proposed installation contains a sieve box 1 (Fig. 1), at least two tiers of sieves 2 and 3 and a pallet 4. The sieves are supported by height-adjustable support devices 5. The adjustment can be carried out using mechanical, hydraulic, pneumatic or any other devices and be carried out both when the sorting is stopped, and during its operation. For feeding fractionated material there is a loading device 6 for uniform distribution of bulk material along the entire length of the upper edge of the sieve 2. The fractionated bulk material is sieved on sieve 2. In this case, coarse particles reaching the lower edge of the sieve are discharged through the unloading unit 7.

Smaller particles of bulk material pass through the openings of the sieve 2 and enter the sieve of the following level 3. Particles that have not passed through the openings of the sieve 3 are removed from the sieve through the discharge unit 8. The particles passing through the openings of the sieve 3 enter pallet 4 and as they accumulate are removed through the unloading unit 9.

Depending on the fractional composition of the bulk polydisperse starting material, an increase or decrease in the speed of movement of the particles of the material on the sieves may be required. The required speed is selected by changing the angle of inclination of the sieve using the adjusting supports 5.

A similar setting is performed separately for each sieve for any number of tiers. Thus, the technical possibilities are realized to increase the quality of fractionation, reduce time costs and increase the productivity of this equipment.

The lower limit, equal to 1 °, is justified by the fact that the bulk material in the sieving process automatically moves along the sieve with a minimum speed to the unloading unit. If the angle of inclination of the sieve is equal to 0 ° (this means that the working surface of the sieve is horizontal), then the bulk material during the screening process does not move along the screen to the unloading unit and the output of the fractionated material from the sieve is also zero. With an increase in the angle of inclination of the sieve, the speed of the particles of the fractionated material along the sieve increases. Accordingly, the installation performance also becomes higher. However, this reduces the efficiency and quality of sieving, since with a high speed of movement of bulk material along an inclined screen, not all particles of fine fractions have time to pass through a layer of bulk material on a sieve and sift through the openings of the sieve to a lower tier. Taking this circumstance into account is especially important when fractionating bulk materials with a high initial concentration of flowing particles, that is, particles whose size and shape allow them to sift through openings in a sieve to a lower tier. An upper limit of 15 ° has been determined experimentally. The specified range from 1 ° to 15 ° is sufficient for the effective sieving of polydisperse materials. However, depending on the initial particle size distribution of the polydisperse granular material, in order to improve the sieving quality without reducing the performance of the installation, individual selection is required, that is, optimization of the angle of inclination of each sieve separately. Technical implementation of this feature is provided in the proposed installation.

Installation operation

The operation of the proposed installation is explained below.

The above sieves 2 and 3 and trays are placed in the sieve box 1 and connected to it. The sieve box 1, and with it the sieves 2 and 3 using a standard drive mechanism (not shown in Fig. 1), a periodic vibration effect (oscillation) is reported. Particles of fractionable bulk material move along the surface of each of the sieves under the action of gravity and the above vibrational effects.

Technical implementation of the proposed installation can be carried out at enterprises for the manufacture of similar technological equipment.

In the proposed installation by changing the angle of inclination of each individual sieves, it is technically provided with an additional opportunity to optimize the technological process of fractionation of bulk material according to the criteria of sieving quality, duration of the technological process and plant productivity.

Bibliography

1. Leshchuk A.E .; Revyakina T.I .; Dyabin N.V. Installation for conditioning wood raw materials. RF patent No. 2047399. Date of publication: 10.11.1995.

2. Akhmadiev F.G., Gizzatov R.F. Mathematical modeling and optimization of the processes of separation of dispersed materials on multilevel sieve classifiers // Bulletin of Kazan State University of Architecture and Civil Engineering. 2011. No4. S. 330-340.

3. Vasiliev S. B., Kolesnikov G. N., Shegelman I. R., Andreev A. A., Kulbitsky A. V. Installation for sorting wood chips // RF Patent No. 109025. Published on October 10, 2011.

Claims (1)

Installation for fractionation of bulk polydisperse materials, containing a sieve box, inclined sieves installed therein with their layered arrangement, characterized in that each of the sieves is connected to the sieve box by means of adjusting supports, providing for changing and fixing the angle of inclination of each sieve independently of other sieves within from 1 ° to 15 °.