SU1425422A1 - Furnace roller - Google Patents

Abstract

The invention relates to ferrous metallurgy, specifically to the transport of metal in roller pass furnaces. The purpose of the invention is to increase the service life. The furnace roll includes a water cooled shaft 1, a barrel 2, a thermal insulating layer 3 between the shaft and the barrel, and supporting sleeves mounted on the shaft on both sides of the barrel. Support sleeves are made of ring layers, while the inner and outer layers 4 are made of metal, and the middle layer 5 is made of metal-ceramic. 1 il.

Description

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The invention relates to ferrous metal, | rgii, specifically for transportation of me-Ta. i.na in roller aisles.

The purpose of the invention is to increase the service life.

The drawing shows a roller, a general view.

The furnace roll includes a water-cooled shaft 1, a barrel 2, a thermal insulating layer 3, and support sleeves mounted on the shaft on both sides of the barrel, which are composed of metal layers 4 and the middle metallomer.myche layer 5.

The clip works as follows.

When being transported in a heated metal furnace, the barrel 2 of the roller heats up to high temperatures and transfers heat through the thermal insulation and bearing bushings to the water cooled shaft. The presence in the sleeves of the cermet layer 5 eliminates the unevenness of the distribution of the heater temperature over the barrel length, reduces heat loss and increases the heat resistance of the support sleeves, since the compressive strength of refractory ceramic materials at high temperatures (900-10000 ° C) is significantly lower. than doped alloys used to make bushings. Sleeve pipes are cast in a centrifugal mold with refractory material, such as chamotte of fractions of 3-10 mm, introduced into the middle barrel. The use of a fraction less than three mm is impractical, as this deteriorates.) There is a variable metal with a ceramic material, and the use of a fraction greater than ten mm leads to uneven distribution of the refractory over the cross section, and in addition, is limited by the size of the metal locker. mystic1-about slo.

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Example. The outer diameter of the roller barrel is 0.2 m, inner 0.15 m, barrel length 1 m, outer and inner diameters of the sleeve are 0.15 and 0.09 m, respectively, and the length of the sleeve is 0.1 m. The thickness of the sleeve layers is between and is 0.01. m. Kaolin wool was used as a heat insulator between a water-cooled shaft with a diameter of 0.9 m and a barrel.

Measurements of temperatures in the area of support sleeves and at a distance of 200 mm from the sleeves of the sleeves showed that the temperature difference in these sections of the barrel is 10 ° C at the furnace temperature of 1200 ° C. Heat loss of 12.3 kW. When testing a roller with single-layer sleeves, the difference in temperature of the drum barrel over the sleeve and heat insulation is 55-60 ° C, the heat loss in the roller is 12.9 kW.

Thus, compared to single-layer sleeves, the use of multilayer allows reducing the temperature drop in the drum barrel from 55-60 ° C to 10 ° C, as well as significantly reducing the thermal stresses in the barrel and extending the service life of the roller by 20-30% . Heat flux through the roller wall decreases by 5% (0.6 kW),

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Claims (1)

Invention Formula An oven roller comprising a water-cooling shaft, barrel, and hollow support sleeves mounted on the shaft on both sides of the barrel, characterized in that, in order to increase service life, the support sleeves are made of annular layers, while the outer layers are made of a middle layer - of metal composed of internal metal, and ceramics.