RU230017U1 - GRATE - Google Patents

Abstract

The utility model relates to the metallurgical and mining industries and can be used to prepare iron ore agglomerate and pellets when loading blast furnaces. The technical task of the proposed utility model is to create a grate with a flat screening surface, i.e. with a surface without protruding grates. In order to achieve the stated technical task, it is proposed to create a grate consisting of a screening surface formed from two types of round grates made by the method of preliminary bending with a bending pitch A and a bending pitch B, intertwined into a rectangular cell forming a gap, wherein the grates with a bending pitch A are located along the material flow, the grates with a bending pitch B serve to install and fix the gap S. This type of grate can be used to obtain different fractions at the request of the consumer by changing the pitch B. By changing the pitch B, gaps S of different sizes are obtained. 3 fig.

Description

Field of technology

The utility model relates to the metallurgical and mining industries and can be used to prepare iron ore agglomerate and pellets when loading blast furnaces.

State of the art

The prior art discloses a sifting surface of a screen for separating slabs (see patent RU 104097 U1 dated 10.05.2011), which includes longitudinal elements made of elastic material, through openings in which metal rods pass transversely, which alternate across the entire plane of the scattering surface through a certain number of rods located at a constant level of the plane of the scattering surface, and the next two are located, one 2 mm below the level, the second 2 mm above the level of the plane of the scattering surface.

A grate section of a screen is known (see patent RU 18503 U1 dated 27.06.2001), containing two support beams and grates fixed to them at both ends, made in the form of rods of circular cross-section, characterized in that the grates are fixed immovably.

The closest in technical essence to the claimed device is a net with square cells made of steel corrugated wire (see GOST 3306-88 of 01.01.90), having a bend in the corrugation at the points of interweaving.

The disadvantages of the above-mentioned design include the relief surface, which reduces the quality of sifting the material due to the presence of protrusions, due to which it is impossible to obtain a high-quality laminar mode of material movement.

Disclosure of a utility model

The technical task of the proposed utility model is to create a grate with a flat sifting surface, i.e. with a surface without protruding grates. Due to the flat surface:

- a more laminar movement of the material is achieved, and as a result the quality of sieving is improved,

- the service life is increased due to the uniform wear of the screening surface.

In order to achieve the stated technical task, it is proposed to create a grate consisting of a sifting surface formed from two types of grates of circular cross-section, made by the method of preliminary bending with a bending pitch A and a bending pitch B, intertwined into a rectangular cell that forms a gap, while the grates with a bending pitch A are located along the flow of material, the grates with a bending pitch B serve to install and fix the gap S.

This type of grate can be used to obtain different fractions according to the customer's requirements by changing the pitch B. By changing the pitch B, gaps S of different sizes are obtained.

Brief description of the drawings

Fig. 1 shows the grate (top view);

Fig. 2 shows section view A-A;

Fig. 3 shows the section view B-B;

Implementation of a utility model

In this section of the description, the most preferred embodiment of the utility model will be given, which, however, does not limit other possible embodiments that clearly follow from the application materials and are understandable to a specialist.

The grate is used in the metallurgical and mining industries, in particular, the described design is designed for use in GA-51A screens and is used to prepare iron ore agglomerate and pellets when loading blast furnaces.

This grate design is an assembly of a screening surface consisting of round grates made by preliminary bending, stamping and interlacing into a rectangular cell, forming a gap with specified parameters (gap width). The use of such a method of assembling a screening surface allows fixing a rectangular cell in the form of a gap, and the use of round grates in screening, sifting of ore raw materials allows making the grate package self-cleaning, which improves the quality of sifting.

Next, after assembly, the sifting surface is mounted into the frame.

The method described above allows to reduce warping and deformation of the cell during heating and cooling, since hot agglomerate is often loaded in blast furnace production and, accordingly, the operating temperature of the grate package reaches +700°C.

Tests showed full functionality of the sample, improved screening characteristics and increased wear resistance.

Claims (1)

A grate consisting of a sifting surface formed from grates of circular cross-section, made by the method of preliminary bending with a bending pitch A and a bending pitch B, intertwined into a rectangular cell forming a gap, wherein the grates with a bending pitch A are located along the flow of material, the grates with a bending pitch B serve to install and fix the gap S.