RU2056028C1 - Furnace roller - Google Patents

Abstract

FIELD: metallurgy. SUBSTANCE: furnace roller includes a barrel, cooled shaft, end sleeves and multi-layer sheet-type insulation placed between the barrel and the shaft. Number of layers are interrelated with a relationship presented in the description and depends on barrel size and shaft size. Number of layers of the sheet- type insulation is not less than 5. EFFECT: cooled shaft. 4 cl, 1 dwg

Description

 The invention relates to the mechanical equipment of heating and thermal furnaces and can be most effectively used in the roller tables of gas furnaces.

 Known furnace roller containing a cooled shaft and a heat-resistant barrel, placed on the shaft by means of end bushings. To reduce heat flow between the barrel and the shaft between them is a multilayer screen insulation [1] The disadvantages of this roller are low durability and design complexity. The presence of a multilayer screen makes it difficult to place intermediate supports on the shaft, which at high temperature leads to a quick deflection of the barrel and the failure of the roller. In addition, for mounting multilayer screens, additional structural elements are used, which complicates the design of the roller.

 The aim of the invention is to increase the durability of the furnace roller and simplify its design.

 The proposed furnace roller contains a cooled shaft and a heat-resistant barrel, placed on the shaft by means of end bushings. Between the barrel and the shaft there is a multilayer screen insulation.

 Screen insulation is made in such a way that it occupies the entire space between the shaft and the barrel, with the exception of the technological gap between the outer layer and the barrel, which is necessary for assembling the roller.

 This embodiment of screen insulation allows it to be used for its main purpose to reduce heat loss between the barrel and the shaft, to maintain a low temperature of the shaft, and also as additional supports for barrel deflection during operation. The fastening of the screen insulation is simplified; it can be made cylindrical or by winding the tape and placed directly on the shaft. Preventing barrel deflection provides increased roller durability.

 The drawing shows the proposed roller.

где D и d внутренний диаметр бочки и наружный диаметр вала соответственно;
δ зазор между внутренней поверхностью бочки и экранной изоляцией;
k коэффициент, характеризующий плотность укладки экранной изоляции;
h толщина одного слоя изоляции.The furnace roller contains a cooled shaft 1 and a heat-resistant barrel 2, which is placed on the shaft 1 by means of end sleeves 3. Between the shaft 1 and the barrel 2 there is a multilayer screen insulation 4. The number of insulation layers n is selected from the following ratio:
n

where D and d are the inner diameter of the barrel and the outer diameter of the shaft, respectively;
δ the gap between the inner surface of the barrel and the screen insulation;
k is a coefficient characterizing the density of laying of screen insulation;
h the thickness of one layer of insulation.

≅ 0,05
Печной ролик работает следующим образом. В процессе эксплуатации при нагреве бочки 2 механические свойства ее материала снижаются, что приводит к прогибу бочки. Зазор δ между бочкой 2 и экранной изоляцией 4 устраняется, бочка опирается на изоляцию и через нее на вал. Благодаря многослойной экранной изоляции 4 вал 1 сохраняет низкую температуру и высокую прочность на изгиб, поэтому прогиб вала 1 и ролика в целом не происходит.In order for the screen insulation 4 to optimally perform both tasks, reduce the heat flux between the barrel 2 and the shaft 1, as well as prevent the barrel 2 from deflecting, these values are chosen in the following ranges: n ≥5, 1.05 <k <1.5, and

≅ 0.05
The furnace roller operates as follows. During operation, when the barrel 2 is heated, the mechanical properties of its material are reduced, which leads to the deflection of the barrel. The gap δ between the barrel 2 and the screen insulation 4 is eliminated, the barrel rests on the insulation and through it to the shaft. Thanks to the multilayer screen insulation 4, the shaft 1 maintains a low temperature and high bending strength, therefore, the deflection of the shaft 1 and the roller as a whole does not occur.

Claims (4)

1. A SAND ROLL containing a cooled shaft, a barrel, end bushings and a multilayer screen insulation located between the barrel and the shaft, characterized in that the number of layers of insulation is determined depending on the transverse dimensions of the barrel and the shaft by the ratio

where n is the number of layers of screen insulation;
D, d - the inner diameter of the barrel and the outer diameter of the shaft, respectively;
δ is the gap between the barrel and the screen insulation;
K is a coefficient characterizing the density of the screen insulation;
h is the thickness of one layer of screen insulation.  2. The roller according to claim 1, characterized in that the number of layers of screen insulation is at least 5.  3. The roller according to claim 1, characterized in that 1.05 <K <1.5. 4. The roller according to claim 1, characterized in that

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