Combination vibration sieve

Abstract

The invention discloses a combined vibration sieve, wherein a coarse sieve surface (6) of a coarse vibration sieve (5) is a sieve mesh formed by a plurality of suspended self-cleaning elastic coarse sieve bars (18) which are uniformly spaced at a certain distance and in a mounting direction oblique upwards or downwards to the coarse sieve surface (6). By adopting the technical proposal, the combined vibration sieve has reasonable structure and high safety and reliability, solves the problems of low screening efficiency and poor screening quality in the prior art, improves the efficiency of screening lump ores, particularly the lump ores with a high water content, minimizes the dust content of screened lump ores and the proportion of lump ores in the powdered ores after screening, further meets the requirements for lump ores in blast furnace production, increases the utilization coefficient of the blast furnace and reduces the production costs.

Description

technical field [0001] The invention belongs to the technical field of industrial material transportation and screening, in particular to screening equipment for bulk mineral materials in metallurgical industrial production, and more specifically, the invention relates to a combined vibrating screen. Background technique [0002] In the production of iron and steel industry, the reasonable charge structure of blast furnace is high alkalinity sinter plus some acid pellets and lump ore. [0003] At present, with the continuous increase of ironmaking capacity of most domestic manufacturers, the sintering capacity is seriously insufficient, and only imported pellets can be used, which will inevitably lead to an increase in ironmaking costs. For this reason, it is often used to increase the proportion of high-grade imported lump ore to solve this problem, but the screening effect of imported lump ore is poor, and contains a large amount of unscreened ore powder. During the use o...

AI Technical Summary

Problems solved by technology

[0005] Nowadays, double-layer vibrating screens are often used to screen lump ore, but the existing double-layer vibrating screens cannot be cleaned once the lower screen is blocked, so the upper screen is often forced to be canceled in actual use, making the double-layer screen become a single screen. Layer sieve, the screening capacity and screening efficiency are greatly reduced;

[0006] The content of the part larger than 8mm in the under-sieve powder is relatively large, generally more than 15%, which affects sintering production and the quality of sintering ore;

[0007] Moreover, the sieve hole of the existing sieve is easy to be blocked, and the water content of the lump ore is required to be high, and the restrictions are very strict. Once the water content of the lump ore is too high, the unloading and conveying of the lump ore will stop, which cannot meet the needs of blast furnace production;

[0008] In addition, in order to prevent the clogging of the sieve hole, we can only increase the aperture of the sieve, generally reaching 7×18mm, so that the proportion of lump ore larger than 8mm in the sieved ore powder is too large, and the sieved powder is used for sintering When the size of the sinter is reduced, the quality of the sinter is affected; if the size of the screen hole is reduced, the blockage of the screen hole will be more serious

Therefore, the existing double-layer sieve not only has low screening efficiency, but also has a high powder content in lump ore after screening, which is generally above 12%, which cannot meet the needs of blast furnace production;

[0009] The form of the upper sieve of the existing double-layer sieve determines that the sieve of the upper sieve is large, and the relative flow rate of the lower sieve is relatively large, which increases the load of the lower sieve, reduces the life of the lower sieve, and reduces the screening efficiency.

The lower sieve cannot be cleaned, and has high requirements on the water content of the lump ore, which cannot meet the production needs

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