SU1765661A1 - Furnace roller with water-cooled shaft - Google Patents

Abstract

SUMMARY OF THE INVENTION: The furnace roll comprises a water-cooled shaft 1, a heat-resistant barrel comprising a monolithic inner layer 2 and an outer layer 3 made in the form of discrete elements placed in the longitudinal direction with a gap between them and with the possibility of temperature elongation. The barrel is supported on the shaft 1 by means of support sleeves 4. In addition, screen insulation 5 is placed on the shaft. Discrete elements can be made annular or in the form of a tape wound on the inner layer of the barrel. 4 hp f-ly, 2 ill.

Description

The invention relates to the field of heating and thermal passage furnaces, in particular, to their structural elements and equipment.

The purpose of the invention is to increase the durability of the work by reducing the temperature stresses in the barrel.

FIG. 1 shows a roller with ring discrete elements; in fig. 2 - roller with an outer layer obtained by winding the tape.

The oven roller contains a water-cooled shaft 1, a heat-resistant barrel, including a monolithic inner layer 2 and an outer layer (s) 3, made in the form of discrete elements. The barrel is supported on shaft 1 by means of support sleeves 4. Screen insulation 5 is placed on shaft 1.

Discrete elements are placed on the inner layer 2 with a gap between them and with the possibility of thermal elongation. They can be made annular (fig. 1) or by wrapping a tape (fig. 2) and installed in one or several layers. The optimal value of the total gap between the discrete elements of each layer is selected from the ratio

s. s (XnTn (

° n - ° (1 + upt

where On is the coefficient of temperature expansion of the material of the nth layer;

Tn is the average temperature of the nth layer; 0 is the barrel length in the initial state; oy is the coefficient of temperature expansion of the material of the inner layer;

T0 is the average temperature of the inner layer.

Screen analysis 5 may also consist of one or several layers.

The oven roller with a water-cooled shaft works as follows. As the furnace temperature rises, the water-cooled shaft 1 heats up and lengthens slightly.

WITH

WITH

VI ON SP O O

The temperature of the inner carrier layer 2 of the barrel, due to the presence of the outer layers (layer) 3 and the optimally selected screen insulation 5, will be significantly lower than the furnace temperature, which increases its non-existent capacity. The discrete elements of the outer layers (layer) of the 3 drums have the possibility of thermal elongation, therefore, they are elongated and partially or completely cover the existing gaps.

I-JЈi P Ј &} I

If op I0 (-, „-g-). then clearances are selected on i i

Roots fully. Restraint of temperature deformations of the inner and outer layers of the barrel does not occur.

When the roller contacts the cold sheet, the outer layer (s) 3 will cool. Due to the fact that the specified layer (s) in the longitudinal direction is formed from discrete elements, they will be freely shortened. In the inner layer of the drum, protected by the outer layers, temperature changes and, accordingly, thermal stress are practically absent. Upon completion of contact with the sheet or when it is heated, the temperature of the outer layer increases, the discrete elements again lengthen.

Temperature stresses in all layers of the roller barrel and in this case practically do not occur.

When the temperature of the working space of the furnace decreases, all layers of the barrel become colder, the gaps between discrete elements are restored. All roller elements return to their original position.

Claims (5)

1. A water-cooled roller roller containing a two-layer barrel with a monolithic inner layer and support sleeves, characterized in that, in order to increase the durability of the work by reducing thermal stresses in the barrel, the outer layer of the barrel is made in the form of discrete elements placed in the longitudinal direction with a gap between them and with the possibility of thermal elongation. 2. A roller according to Claim 1, characterized in that it is provided with screen insulation installed on the roller shaft. 3. Roller according to claim 1, characterized in that the outer layer of the barrel is multi-layered. 4. Roller according to claim 1, characterized in that the total gap between the discrete elements is selected from the ratio d i (hoto bp l ° (1 + ptp) where an is the coefficient of temperature expansion of the material of the nth layer; Tn is the average temperature of the nth layer; 10 - barrel length in the initial state; "O - coefficient of temperature expansion of the material of the inner layer; This is the average temperature of the inner lid. 5. A roller according to claim 1, characterized in that the discrete elements are annular or in the form of a tape wound on a barrel. FIG. one FIG. 2