SU1747840A1 - Furnace roller with water-cooled shaft - Google Patents

Abstract

SUMMARY OF THE INVENTION The furnace roller contains a water-cooled shaft 1 and a composite heat-resistant barrel 2 Endless and intermediate support sleeves 3 and 4 are permanently placed on the shaft. The end-sleeves 3 are fixedly connected to each other, for example by welding. on intermediate support sleeves 4 with the possibility of longitudinal movement and with gaps 5 Thermoisation is placed between shaft 1 and barrel 2, for example screens 8 4 or

Description

The invention relates to the mechanical equipment of heating and thermal furnaces and can be used in continuous roller furnaces.

Known furnace roller with a water-cooled shaft, containing a composite heat-resistant barrel of end length and intermediate support sleeves. The junction of the half-wheels is made butt and placed above the intermediate support sleeve.

A disadvantage of the known roller is the low quality of heating due to intensive heat removal through the intermediate sleeve and the cooling of the charge in the middle part of the roller. In addition, when using backfill thermal insulation, it is poured out through the gap between the half hubs and the intermediate sleeve, which leads to a sharp increase in heat losses

The closest to the proposed technical essence and the achieved positive effect is a furnace roller with a water-cooled shaft containing a heat-resistant barrel with a composite length, end and intermediate support sleeves, in which the half-shells are joined by welding on the intermediate support sleeve, while the support sleeves have cavities to reduce the area heat transfer

The disadvantages of such a roller are as follows. In the area of the refractory masonry, the temperature of the roller barrel decreases by 300-400 ° C, primarily due to the substep, therefore the front bushing and the presence of a cavity in it do not have a decisive effect on the intermediate support sleeve and the heat sink through it leads to a decrease in temperature on the surface of the barrel by 150-200 ° C. The cavity in this sleeve reduces the indicated difference only by 40-50%, therefore uniform heating of the charge, especially the sheet in this zone, does not provide ts

In addition, such a roller is characterized by low durability since the weld in the high temperature zone is quickly destroyed.

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4 vi 00 4 About

The purpose of the invention is to improve the quality of heating by reducing the heat sink through the intermediate bushings.

The goal is achieved by the fact that in a furnace roller with a water-cooled shaft containing a heat-resistant barrel of composite length, end and intermediate bearing bushings, the intermediate bushings being placed under the interface between the barrel parts, according to the invention, the coupling of barrel parts relative to each other is superimposed thermal expansion, with the length of each conjugate area equal to or greater than the width of the intermediate sleeve, and the total value of the gaps is equal to the maximum temperature lengthening of the outer th surface of the barrel.

The overlap mating allows, depending on the design, to obtain a two- or multi-layered section of the barrel placed above the intermediate support sleeve. Due to this, in this zone the heat sink decreases, the temperature increases on the surface of the barrel and the heating quality is improved.

The drawing shows a longitudinal section of the oven roller of the proposed design.

The oven roller contains a water-cooled shaft 1 and a heat-resistant barrel 2, which is composite in length. On the shaft, end 3 and intermediate 4 support sleeves are permanently placed. For end sleeves 3, the barrel is fixedly connected, for example, by welding. 5, mating areas 6 are placed, contacting on cylindrical surfaces 7. Thermal insulation, for example screens 8, is placed between shaft 1 and barrel 2.

The barrel of the roller may consist of two (Fig. 1), three or more parts. Interfaces can be two-layer with one contact surface 7, three-layer, with two contact surfaces, etc.

The number of layers is determined by heat engineering calculations depending on the temperature of the working space of the furnace, roller design, type of thermal insulation, etc.

The length of the mating sections 6 is equal to or greater than the width of the intermediate support sleeves 4. The total value lfc of the gaps 5 is determined from the following relationship

... + ln aT (Li + ... + Ln + Ln + i),

where n is the number of adjacent areas; IIn - the magnitude of the gaps at normal temperature;

LI Ln + i - the length of the segments of the composite

barrels;

a is the coefficient of temperature expansion of the barrel material;

T - the maximum temperature of the outer surface of the barrel during operation,

The oven roller works as follows.

During operation, the roller barrel is heated, its components are elongated and move in the axial direction until the gaps are completely closed. Due to the fact that the length of the matching areas is

or exceeds the width of the intermediate sleeve, a multi-layered section of the barrel forms over the latter, the heat sink through which is reduced. Since the total value of the gaps between the matching

parts of the barrel equal to the maximum temperature elongation of the entire barrel, the gaps completely overlap, at the same time there is no restriction of temperature movements of the barrel.

Thus, due to the performance of the kiln roller in accordance with the proposed solution, a uniform temperature is provided on the entire surface of the barrel, and the quality of heating of the charge improves.

In addition, the multi-layered mating of the barrel parts prevents the eruption of filling insulating material,

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Claims (1)

Invention Formula A furnace roller with a water-cooled shaft containing a heat-resistant barrel with a composite length, end and intermediate support sleeves, the intermediate sleeves being placed under the interface between the barrel parts, characterized in that, in order to improve the quality of heating by reducing the heat sink through the intermediate sleeves, mate parts of the barrel are overlapped with a gap on the temperature expansion, and the length of each adjacent section is equal to or greater than the width of the intermediate sleeve, and the total size of the gaps is equal to the maximum temperature elongation of the outer surface of the barrel. ul n s N5. Z-f-Lf S & sha CHChCHCHCHCHUUCHUCHChChCh HOGCHACHCHUCHChCHCHCHUCHChCH , 1ILV --- 11G -1 | - l f ..uch ////// L 7 n gff b i 9 Y /////////// X7 / 7/7 ( one & H g 1ILV --- 11G -1 | - l $ 999 f g with OW1W.I FIG. four