C H A N G E OF THE I N S T A L L A T I O N AND R E I N F O R C E M E N T

OF THE G R A T E S ON T HE A G G L O M E R A T E BINS

Vo E.

Translated from Metallurg, No. 3, p. 12, March, 1962

The side grates on the agglomerate bins in the ore yard of the blast-furnace mill are usually made of mining rails and mounted on a level with the railway (Fig. 4a), being welded to the subrail bridging. On discharging, agglomerate is often wedged between the clogged grates and the open rims of the hoppers. Because of this, the grates are twisted off and ruined when the hopper cars move. In addition, the grates are widened and warped, and t h e

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A L /

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b

Fig. 4. Installment of the grates before the change (a) and after the change (b). 1) Grate; 2) subrail bridging; 3) longi- tudinal rail; 4) hanger; 5) angle iron.

welding beads ruined due to the high temperatures of the agglom- erate. Therefore, the grates must be repaired very frequently. Over 220 tons of mining rails and about 25 tons of angle irons are used in the repair of the grates each year in the MMC. A crew of repair workers consisting of 6 men is occupied with repair work the year round.

On the suggestion of V. A. Shastin, D. S. Gormakov, and T. Kh. Valeev, the level of installing the grates and the manner of reinforcing them were altered (Fig. 4b) in order to increase the service period of the grates in the Magnitogorsk Metallurgical Combine. One end of the grate is supported below by longitudi- nal rails which are suspended in hangers along the gantry, and the other end rests on an angle iron which is fastened to the pil- lar supporting the railway. The suspended grates have been low- ered 300 mm below the level of the railway; this gives them rigidity when the hopper cars move along the railway, and the rims of the hoppers when swinging back do not twist off the grates. Since the grates are not fastened to the supporting rail, they do not warp under the influence of high temperatures. The interval of service between repairs is more than a year. This permitted curtailing metal consumption by about 200 tons per year and freeing a crew of repair workers for service elsewhere in the mill.

A yearly saving of about 5000 rubies has been realized by

the reduction of labor and material costs for making and repairing the grates.

This procedure can be recommended for introduction at other plants.

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