SU734898A1 - Device for by-pass of self-sintering electrode of thermal ore electric furnace - Google Patents

Description

The invention relates to electrothermal, in particular to the production of ferroalloys, calcium carbide, yellow phosphorus, copper-nickel ligatum in arc ore-thermal furnaces. A device for transferring a self-cutting electrode of an electric arc furnace is known, comprising a spring-hydraulic mechanism located under the supporting cylinder, a pressure ring BUT with clamps, contact cheeks, a block diagram consisting of coils, contact cylinders which clamp electrodes, an automatic block issuing a command to Electrode bypass with optimal electrical operation of the furnace, and manual switches 1. A disadvantage of this device is that bypassing the electrode is carried out without constant monitoring of the steppe and coking of the electrode in the contact cheeks, therefore, when the bypass is passed, the electrode goes out under the cheeks of a non-coked one, which causes damage to it. A device for bypassing a self-sintering electrode of the ore-thermal Electric Furnace is known, which contains contract cheeks installed along the perimeter of the electrode in the pressure ring, an electrode repositioning mechanism connected to the output of the control unit, the input of which is connected to the electrode mass determination unit in the coking zone 2. The low sintering degree of the electrode is poor, which reduces the quality of the electrode. In order to improve the quality of the electrode, the unit for determining the state of the electrode mass is made in the form of a source (f - quanta and a radioactive top system detector installed on diametrically opposite electrode areas in the pressure ring at a distance from the lower edges of the contact cheeks equal to their height. the source and receiver of radioactive radiation in the plane, perpendicular to the surface of the electrode, at a distance of 1 / 2-1 / 3 the length of the contact cheeks (W) from their lower edges is due to the fact that with the correct sintering mode electrode in this horizontal plane should be located isotherm start coking electrode mass. If the electrode

coking above 1/2 the length of the cheeks from their lower edges, it is poorly formed, the geometrical dimensions are disturbed, the contact cheeks fit to the electrode casing is deteriorated, the transient electrical resistance increases; if the coking goes below 1/3 of the cheek length, then the current passing through the electrode casing increases, since it cannot pass all through a narrow section of the coked mass, which leads to the burnout of the casing and breakage of the entire electrode

FIG. 1 shows a contact node, a general view; in fig. 2 - section of the contact node in which the isotopic system is located; in fig. 3 - electroheater equipment block scheme. .

Electrode 1 is surrounded by eight contact cheeks 2 located in a push-in clamp ring 3, in which also the source 4 of radioactive radiation and the receiving detector 5 are placed.

The block diagram includes a universal switch b, a magnetic starter 7, the power contacts which supply voltage to the press drive of the pressure jaws of the bypass device, the disconnecting contacts 8 of the intermediate relay 9, the closing contacts 10 of the receiving detector, the coil of the relay 11 and a constant battery current 12 to power the relay 11.

The device works as follows.

After bypassing the electrode 1 electrode mass in. the plane, where the source 4 and the γ-quanta receiver (detector) 5 of radioactive radiation are in the semi-coked state and have a low density, the quanta are weakened by the mass slightly, and the energy passing through the electrode is sufficient for the coil of the detector 11 of the detector S was in a tightened condition. In this case, the closing contacts 10, it turns on the intermediate relay 9, which opens the contacts 8 to lock on the magnetic actuator 7 bypass hydraulic cylinders

734898

device even when turning on the universal switch 6.

As soon as the mass is fully enclosed, its density increases, the attenuation (fi-quanta increases, the detector's relay 11 disappears, which by closing contacts 10 switches on intermediate relay 9, which by opening contacts 8 enables H1-e to turn on; magnetic starter 7, i.e. permission to bypass the electrode.

The ban on the bypass of non-coking electrodes will completely eliminate the electrode breaks, which will give an economic effect on the furnace alone, taking into account the cost of installing a radioisotope system on the electrodes of one furnace (7900 rubles) at least 30,000 rubles, and the plant as a whole exceeds 100,000 rubles . in year.

Claims (2)

Invention Formula A device for bypassing a self-sintering electric; ore-thermal electric furnace, containing contact cheeks installed along the perimeter of the electrode in the pressure ring, the mechanism for moving the electrode connected to the output of the control unit, to the input of which the unit for determining the state of the electrode mass in the zone is connected. Coking, characterized in that, in order to improve the quality of the "1 electrode, 6; ioK, the determination of the state of the electrode mass is made as a source of 1 -quanta and a detector of the radioisotope system, which are installed on diametrically opposite parts of the electrode in the pressure ring at a distance from the lower the edges of the contact cheeks equal to 1 / 2-1 / 3 of their height. Sources of information taken into account in the examination 1, USSR Author's Certificate No. 290485, cl. H 05 B 7/148. 2. Japanese Patent 49-52804, cl. 10 D 122.4, publ. 1974.