SU856044A1 - Device for by-passing electrode of electric arc furnace - Google Patents

Description

The invention relates to electrical engineering, namely, electric arc furnaces, can be used in ferrous and nonferrous metallurgy, as well as the chemical industry. A device for bypassing a self-shedding electrode is known, comprising a suspension system b of a mechanized bypass of the electrode l. However, this device is unreliable in operation due to insufficient clamping of the contact cheeks. The closest to the proposed technical essence and the achieved result is a device for bypassing the electrode of an electric arc furnace, containing an electrode casing, pronounced as external and internal shells connected equidistant from each other by radial ribs, and the cheeks covering the casing are connected to the bypass assembly 2. The disadvantage of this device is that the clamp cheeks of the electrode bypass device are installed without taking into account the location of the casing ribs. In this case, the membrane sections of the electrode casing shell are under considerable stress from the clamping cheeks and, therefore, it is necessary to overestimate the thickness of the casing, which leads to an increase in the electrode casing, to reduce the cost of production. The purpose of the invention is to improve the operating conditions of the bypass device. This goal is achieved by the fact that the central areas of the cheeks are located on the VHB ribs, the number of cheeks is chosen to be multiple of the number of ribs, and the width of the cheek is equal to 0.6-0.8 the length of the intercostal area of the outer shell. On fst 1 shows an electrode bypass device, general view; in fig. 2 Toiike, cross section. On the yoke 1 is located the lower ring 2 of the device for transferring the electrode with push cheeks 3. On the lower ring 2 is placed a hydraulic cylinder 4 with a stem 5, by means of which the upper movable ring fc with push cheeks 3 is displaced during the bypass. an electrode, which is large in the form of an outer shell 7, internal shells 8 and radial ribs 9 which are equidistant from each other connecting them.

The device works as follows.

The electrode is alternately clamped with upper or lower clamping cheeks, while the location of the central sections of the pressing cheeks 3 opposite the ribs 9 increases the mechanical stability and rigidity of the electrode casing and increases the reliability of the contact of the pressing cheeks, since deformation of the shell 7 sections located between the edges does not occur.

For structural or technological reasons, the electrode casing can be made with a larger number of ribs than the number of clamping cheeks. AT . In this case, the number of clamping cheeks is chosen as a multiple of the number of ribs and the central sections of the cheeks are located opposite the ribs.

In order to avoid deformation of the intercostal areas of the shell 7 of the electrode casing, the width of the cheek 3 is chosen equal to 0.6-0.8 of the length of the intercostal area of the outer shell. When the ratio is less than 0.6, the cheek height increases significantly while maintaining the value of the optimum specific pressure at the contact, and if the ratio is greater than 0.8, the cheeks will cover: a significant part of the intercostal space of shell 7, which negatively affects its stability.

The use of the device according to the invention makes it possible to manufacture the electrode casing from a smaller sheet. thickness, which leads to a reduction / consumption of material. and the weight of the casing, as well as to a decrease in the cost of production. For example, in existing ore-smelting electric furnaces, the shells of self-burning electrodes with a diameter of 1500 mm are now made of steel

sheet 4mm thick.

Calculations show that the proposed design of the device for bypassing the arc furnace electrode requires mechanical strength of the casings.

the electrode is provided with a shell thickness of about 2 mm, and decisive for selecting the thickness of the shell is an electrical calculation, according to which the shell thickness is ~ 2 mm. As a result, we have that for an electrode with a diameter of 1500mm, the enclosures of the housing can be halved.

Thus, the proposed device improves the working conditions by increasing the reliability of the contact pressure.

cheeks and reducing the weight of the electrode housing.

Claims (2)

1.Gasik M.I. Self-firing electric furnaces of ore-producing electric furnaces. Moscow, Metallurgists, 1976, p. 271. 2. Strunsky. Ore-smelting melting furnaces. M., Metallurgists, 1972, with. 189.