RU48283U1 - SITO (OPTIONS) - Google Patents

Abstract

Utility models relate to the field of separation of bulk materials by size and can be used in coke production for sorting coke, as well as in coal, mining, construction and other industries. Utility models solve the problem of increasing the efficiency of screening while ensuring the grain boundary size of the sifted material, as well as the possibility of replacing not only the whole sieve, but only its worn part. According to the first useful model (the first version of the sieve), the problem is solved in that the sieve containing the sieving surface consists of separate longitudinal sections equal to its length and separated from each other by gaps, the width of the gap corresponds to the boundary grain size of the sifted material. According to the second utility model (the second version of the sieve), the problem is solved in that the sieve containing the screening surface consists of separate twin or built longitudinal sections equal to its length and separated by gaps, the width of the gap corresponds to the boundary grain size of the sifted material. According to the third utility model (the third version of the sieve), the problem is solved in that the sieve containing the sieving surface consists of separate longitudinal sections equal to its length, while the longitudinal sections located in the section secondary to the direction of movement of the sifted material are separated from each other by gaps whose width corresponds to the boundary grain size of the sifted material.

Description

Utility models relate to the field of separation of bulk materials by size and can be used in coke production for sorting coke, as well as in coal, mining, construction and other industries.

A sieve is known, including a screening surface having the same cell area along the entire length [1]. However, this does not provide high quality screening. In addition, at the beginning of the sieve in the place where the sorted material falls, rapid wear of the screening surface is observed, which significantly reduces the life of the sieve.

A device for separating solid materials [2]. The device includes a casing with estrus, a sieve made in the form of a truncated cone, a distribution plate, a loading funnel and an aspiration system.

The sieve (sieve) of the specified device has meridional slotted holes made expanding to the periphery in the direction of movement of the material.

This arrangement of the holes prevents jamming of the grains during sieving.

A disadvantage of the known sieve is the complexity of its manufacture.

Also known is a separator device for separating bulk materials [3]. The device includes a housing, a receiver, a dividing surface.

The dividing surface, which acts as a sieve of the reduced device, is formed by rods (round or corner) of variable or constant cross-section, due to this, wedge-shaped screening surfaces (cells) are formed, increasing in the direction of the common end.

The device due to the wedge-shaped cells provides high sieving performance.

The disadvantages of this device are:

- the complexity of manufacturing a screening surface, especially in the manufacture of round rods of variable cross-section and rods from a corner of variable cross-section;

- difficulty in obtaining the desired fraction of the under-sieve product.

A string sieve is also known [4]. The wear resistance of string sieves is several times higher than that of ordinary woven sieves.

The disadvantages of string sieves are:

- the complexity of manual manufacturing;

- to obtain the same size of the under-sieve product when using string sieves, the width of the slots between the strings should be set within 0.7-0.8 mesh sizes of square sieves.

The closest analogue to the claimed technical solutions is a sieve with an harp-shaped mesh [5]. In order to obtain the equivalent size of the under-mesh product, the width of the rectangular cell of the harp-shaped mesh should be (0.8-0.85) a, where a is the size of the replaced square cell.

The harp-shaped sieve allows to obtain high sieving performance of the material.

The harp-shaped sieve has the following disadvantages:

- the complexity of its manufacture;

- the impossibility of obtaining the exact fraction of the sorted material due to the significant extension of the string from 0.8 to 0.85 of the size of the replaced square cell;

- the low durability of the sieves, as well as other wire and stamped sieves, and the need for frequent replacement of sieves, while having to change the entire sieve, although only the part where all the sorted material enters is worn out.

The technical task of utility models is to increase the efficiency of screening while ensuring the grain boundary size of the screened material (the size of the fraction of the screened material), as well as the possibility of replacing not only the whole sieve, but only its worn part.

The problem is solved in that the sieve containing the screening surface according to the first utility model (the first version of the sieve) consists of separate longitudinal sections equal to its length and separated from each other by gaps, the width of the gap corresponds to the boundary grain size of the sifted material.

The problem is also solved by the fact that the sieve containing the screening surface according to the second utility model (the second version of the sieve) consists of separate twin or built longitudinal sections equal to its length and separated from each other by gaps, the width of the gap corresponds to the boundary grain size of the sifted material.

The problem is also solved by the fact that the sieve containing the screening surface according to the third utility model (the third version of the sieve) consists of separate longitudinal sections equal to its length, while the longitudinal sections located in the secondary section along the direction of the screened material are separated from each other gaps whose width corresponds to the boundary grain size of the sifted material.

With such technical solutions, it is possible to replace, when worn, not the entire sieve, but the individual worn sections, as well as the fact that individual sections provide both high sieving efficiency and the required grain size limit of the screened material, as well as the ability to quickly replace worn sections, which reduces downtime and improves coke sorting performance.

The essence of the claimed technical solutions is illustrated by drawings.

Figure 1 shows a sieve, consisting of separate longitudinal sections 1. The length of the sections is equal to the length of the sieve. The sections are separated from each other by gaps 2. The width of the gap corresponds to the size of the boundary grain of the sifted material. Gaps between sections - along the entire length of the sieve.

Figure 2 also shows a sieve, consisting of separate sections 1 along the length equal to the length of the sieve. The gaps between sections 2 are available only in the secondary section 3 in the direction of movement of the screened material, and there are no gaps in the primary section 4. If necessary, any gap length can be provided.

Figure 3 shows a sieve also consisting of separate sections 1, equal in length to the length of the sieve. Gaps 2 are only available between twin sections. You can also provide gaps between built sections.

Obviously, the efficiency of the sieving of the material through the sieves indicated in figures 1, 2, 3, depends on the total length of the gaps between the sections. Therefore, for the sieve shown in figure 3, as well as for the sieve shown in figure 2, if necessary, you can provide any length of the gaps between the sections.

The sieve shown in figure 1, 2, 3 work as follows. Sorted material falls into the primary sections. In these areas through the cells, the predominantly small fraction of the sorted material is screened out.

A large fraction as a result of stratification is located on a layer of a small fraction and begins to be sifted out only after partial screening of fines. But when both small and large fractions fall into the gaps between the sections, the sieving efficiency increases significantly.

Figure 1, 2, 3 shows the section with square cells. All sections, and each separately, can have a different cell shape corresponding to the size of the boundary fraction of the sifted material: round, in the form of a regular polyhedron, square, rectangular, rhombic, triangular, etc. There can also be various options for arranging sections, for example, in the center of the sieve — sections with round cells, along the periphery of the sieve — with square or other cells, etc.

Examples of specific performance

1. In the coke sorting workshop of CJSC Standard-K, OJSC MMK conducted experiments on sorting blasting screenings of coke with a fraction of 0-40 mm. To exclude an error of various composition, synthetic samples were prepared for all screenings, i.e. samples consisted of fractions: +25 mm - 30%, 10-25 mm - 40% and 0-10 mm - 30%. Thus, all initial samples consisted of a fraction of + 25 mm - on average 30% (from 29 to 31) and a fraction - 25 mm on average of 70% (from 69 to 71) (40% of a fraction of 10-25 mm and 30% of a fraction 0-10 mm)

Sifting was carried out on a standard control screen through an alphavoid sieve for a 25 mm fraction. Then, the sieve product passing through the sieve was sieved on a standard manual sieve with square cells of 25 × 25 mm according to the standard method and the screening coefficient was determined.

2. The conditions of the experiment are the same as in example No. 1. Sowing was performed on a control screen through a sieve for a fraction of 25 mm in accordance with paragraph 1 of the formula of the utility model. Then, the sieve product passing through the sieve was sieved on a standard manual sieve with square cells of 25 × 25 mm according to the standard method. And the screening coefficient was determined

3. The conditions of the experiment are the same as in example No. 1. Sifting was carried out on a control screen through a sieve for a 25 mm fraction in accordance with paragraph 2 of the utility model formula. Then, the sieve product passing through the sieve was sieved on a standard manual sieve with square cells of 25 × 25 mm according to the standard method and the screening coefficient was determined.

4. The conditions of the experiment are the same as in example No. 1. Sifting was performed on a control screen through a sieve for a 25 mm fraction in accordance with paragraph 3 of the utility model formula. Then, the sieve product passing through the sieve was sieved on a standard manual sieve with square cells of 25 × 25 mm according to the standard method and the screening coefficient was determined.

The results of the experiments are given in table. 1. Example No. 1 relates to a prototype (harp-shaped sieve), Example No. 2 relates to claim 1 of the utility model formula (sieve shown in FIG. 1), Example No. 3 relates to claim 2 of the utility model formula (sieve shown in FIG. 2 ), example No. 4 relates to claim 3 of the utility model formula (sieve shown in FIG. 3)

Table No. of experience Lower class content
(-25 mm) in the original Lower class content
(-25 mm) in the oversize Screening ratio Note material, A, wt% product after screening, 100 × (AB) × 100 , A × (100-B) B, wt.% wt.% 1 2 3 4 5 Prototype 1 70 28 83.3 (harp sieve) The claimed 2 71 eleven 95.0 technical the solution according to claim 1 of the formula useful models 3 69 12 93.8 The same according to claim 2 4 70 16 91.8 The same according to claim 3

As the data in the table show, the screening coefficients when sifting through sieves in accordance with the claimed technical solutions are higher in comparison with the prototype and are: 95.0; 93.8 and 91.8%

Sources of information

1. L.B. Levenson. Machines for mineral processing. Their theory, calculation and design. Gosmashmetizdat, M - L .: 1933, p.31, Fig.10.

2. Autosvid. USSR No. 946689, M. Cl. 07 V 1/00, 1/46, publ. in BI No. 28, 07/30/82

3. RF patent No. 2165802. M. Cl. 07 V 1/06, 1/46, publ. 04/27/01

4. D.A. Muchnik et al. Sorting of coke, Metallurgy, Moscow: 1968, p. 254.

5. L.A. Weissberg. Design and calculation of vibrating screens, "Nedra", Moscow: 1986, p.132-133.

Claims (3)

1. A sieve containing a screening surface, characterized in that it consists of separate longitudinal sections, equal to its length and separated from each other by gaps, the width of the gap corresponds to the boundary grain size of the screened material. 2. A sieve containing a screening surface, characterized in that it consists of separate twin or constructed longitudinal sections, equal to its length and separated from each other by gaps, the width of the gap corresponds to the boundary grain size of the screened material. 3. A sieve containing a screening surface, characterized in that it consists of separate longitudinal sections equal to its length, while the longitudinal sections located in the secondary section along the direction of the screened material are separated from each other by gaps whose width corresponds to the grain boundary size sifted material.