SU685359A1 - Electrically vibrated screen - Google Patents

Description

(54) ELECTRIC VIBRATION

one

The invention relates to the field of separation of solid materials and can be used in blast furnace production for screening small fractions of sinter before loading it into the furnace.

An electrovibration screen is known, including a vibrator, grates mounted on a box supported by shock absorbers on frame 1.

The disadvantage of this screen is the lack of a device for pre-separating the lumpy fractions, which prevent the removal of fines from the upper part of the layer of material on the grate retainerTKe 1, the insufficient screening area, that screening efficiency and screening capacity.

The purpose of the invention is to increase the efficiency of screening and screen productivity.

This is achieved by the fact that the electrovibration screen is equipped with an additional lightning of grates, consisting of the receiving and working parts, and the receiving part of the upper tusk is rigidly fixed

on the box, and the working part of the upper tier of the grates has the ability to rotate on the hinge rigidly fixed on the jaws of the duct, and in the working position it is attached with wedges to the duct, while the niHpHs of the slots of the upper tier grids are 2-3 times the width of the slots of the lower tier grates.

FIG. I shows the rumble, general view; in fig. 2 is a view A of FIG. one.

The electrovibration screen consists of a support frame 1, on which the box 3 and the electric vibrator 4 are supported by means of damping springs 2. In the box the receiving part o and the working part 6 of the upper tier of grates are installed.

The working part 6 of the upper wall of the grate is installed on the box with the help of the joint 7 and is reinforced in the working condition with wedges 8.

The receiving part 5 and the working part 6 of the upper floor of the grates have a width of up to 22 mm.

On the box 3, the bottom is rigidly fixed.

Rus grates with schichinoi slit and-i

mm

To control the performance of the upper grate of the grate, the working part B has the ability to change the angle of rotation by 15-20 °. And to prevent an arbitrary change in the angle of inclination, the working part 6 of the upper wall of the grate is secured with wedges 8.

The device works as follows.

When the electric vibrator 4 is turned on, the box 3 of the screen along with the grate 5, 6, 9 receives a reciprocating (oscillatory) movement, as a result of which it is possible to move the material coming from the bunker to the receiving part 5 of the upper floor of the grates. When moving along the grates of the receiving 5 and working 6 parts of the upper tier, having slots 22 mm wide rfo, the material of the fraction less than 20 mm spills onto the lower rus 9. Under the influence of vibration, a layer of material on the lower tier of the grates moves towards the discharge part of the screen. When a part of the material moves along the lower russia of the 9 grates, small fractions are sifted out of it.

Material that does not contain small fractions from the working part 6 of the upper tier and from the lower tier 9 of the grate enters the common receiving tray and is used for loading into the blast furnace, and fines (under-grate product of the lower tier of the grate) are fed to the receiving tray and then processed into sinter plant.

Thus, dividing the material flow into two layers makes it possible to reduce the height of each of the layers, isolate coarse fractions from the lower layer, and thereby create more favorable conditions for screening fines while simultaneously increasing the screen output.

The use of sinter-free sinter in the blast furnace charge makes it possible to increase the productivity of the furnaces by 3% and reduce the specific consumption of coke per

4% for every 10% of the fines removed from the sinter.

Claims (2)

Invention Formula . An electrovibration screen, including a vibrator, grates mounted on a box supported by shock absorbers on a frame, characterized in that, in order to improve the performance and efficiency of screening, it is equipped with an additional light grate, consisting of receiving and working parts, while working the part is hinged in the box. 2. A screen according to claim 1, characterized in that the vibrator is connected to the duct by a flange connection. Sources of information taken into account in the examination 1. USSR author's certificate No. 344901, cl. B 07 B 1/40 1971 (prototype)