SU907881A1 - Device for by-pass of electric arc furnace electrode - Google Patents

Description

(54) DEVICE FOR ELECTRODE ARCH OF ELECTRIC ARC ELECTRODE

I

The invention relates to metallurgy, in particular, can be used in arc and ore-thermal furnaces of ferrous and non-ferrous metallurgy, as well as chemical industry.

A device for bypassing an electrode is known, comprising a brake clip and brake pads. The electrode is held by a brake band that is welded to the electrode casing.

The disadvantage of the design is that it does not provide remote control of the electrode bypass, and also does not allow forcing the electrode through the contact unit.

In addition, this device does not allow the electrode to be bypassed upwards, i.e. reverse bypass.

At present, the device is operated only on furnaces of the equipment that has been suspended.

The closest to the technical essence of the invention is a device for bypassing the electrode, containing upper and lower pressure rings, mounted on a carrier cross member of a hydro-lifting electrode holder, and vertically located between the rings of the Hz hydraulic cylinders.

A disadvantage of the known device is that it does not provide the possibility of bypassing the electro 15 and up, i.e. reverse bypass.

When operating the furnace, it is necessary to perform a reverse bypass, for example, during repairs, before stopping the furnace for repairs,

20 when it is advisable to reduce the length of the working end of the electrode to prevent it from breaking. There are also cases when the device

390

for bypass, the deformed area of the electrode falls. To correct a defect in the electrode housing, it is necessary to flip it up.

The purpose of the invention is to increase the reliability of operation when the bypass of the estradus is up.

This goal is achieved by the fact that the device is provided with a rigid frame between the pressure rings covering the electrode with vertical posts passing through the lower pressure ring and mounted on the hydraulic lift and fixed on the upper and lower planes of the frame coaxially.

FIG. 1 shows a general VID1 of FIG. 2 shows section A-A in FIG. 1 (plan view), in FIG. 3 view B in FIG. 1 (installation of hydraulic cylinders)

The device for bypassing the electrode of the arc furnace contains an upper pressure ring 1 with clamping cheeks 2 covering the electrode 3 vertically located hydraulic cylinders. 4, mounted on the upper plane of the frame 5, connected to the ring 1, the lower pressure ring 6 with clamping cheeks 7, vertically arranged hydraulic cylinders 8 attached to the lower plane; frame 5, connected to the ring 6. Hydraulic cylinders 4 and 8 are located coaxially to each other. The frame 5, the vertical legs 9, extending through the sleeve 10 of the ring, rests on the supporting yoke 11, to which the carrying case 12 is attached.

The bottom ring 6 rests loosely on the brackets 13 attached

to traverse 1I.

FIG. 2 shows a device with three hydraulic cylinders A for the upper ring 1 and three hydraulic cylinders 8 for the lower ring 6, as well as three vertical supports 9, which are located in plan between the cylinders 4 and 8.

The number of cylinders 4 and 8 and, accordingly, the number of racks 9 is selected depending on the lifting capacity of the device and for structural considerations.

The device for bypassing the electrode of the arc furnace operates as follows.

When the electrode 3 is bypassed, the cheeks 2 of the ring 1 are pressed, then pressure is applied to the hydraulic cylinders 4 and the ring 1 with the pressed cheeks 2 rises up by a predetermined amount, after which the cheeks 2 again clamp the electrode 3, which until then was kept from slipping in the cheeks 7 of the lower ring 6. Thereafter, the pressure is released from the cylinders 4.

Next, the cheeks 7 are pressed out and the pressure is supplied to the rod end of the hydraulic cylinders 4, with the result that the electrode 3 together with the ring 1 is lowered downwards by the stroke of the piston of the hydraulic cylinders 4. After that, the cheeks 2 are clamped again and the pressure from the direct bypass cycle is.

During the period of the direct nepenycira electrode, 3 rods of hydraulic cylinders 8 are maximally extended

When the electrode is directly bypassed, the load from the mass of the electrode 3 is picked up by the frame 5 and the legs 9.

The reverse bypass of the electrode 3 is performed as follows.

In the initial position, the cheeks 2 and 7 are pressed to the electrode 3.

Pressure is simultaneously applied to the rod end of the hydraulic cylinder 8 and to the rodless cavity of the hydraulic cylinders 4, with the result that the electrode 3 rises up by the stroke of the rods of the hydraulic cylinders 4 and 8. When

Claims (2)

lifting up the electrode 3, the ring 6 moves away from the brackets 13 and is held by the rods of the hydraulic cylinders 8. After the electrode 3 is in its extreme upper position, the ring 6 is lowered, dp which the cheeks 7 are pressed and the rodless cavities of the hydraulic cylinders 8 are pressed and the ring 6 is lowered down on the brackets 13, after which the pressure is removed from the hydraulic cylinders 8. Next, the upper ring 1 is lowered, for which the cheeks 2 are pressed (the electrode 3 is held in the cheeks 7) and pressure is applied to the rod end of the hydraulic cylinders 4. The ring 1 lowers down and take a starting position. Next, the reverse bypass cycle is repeated. Thus, electrode 3 can be raised by any amount. With a vertical movement of the ring 6, which takes place only when the electrode bypass returns 3 "but is centered by the sleeves 10, inside which the stands 9 pass. As with the forward and reverse switch; the launches of electrode 3, the frame 5 is stationary. A direct bypass of electrode 3 in this device can also be carried out with the vertical movement of the lower ring 6 and the fixed ring 1. In this case, the following order of operations must be performed. First, the cheeks 7 are pressed out and pressure is applied to the rod spaces of the hydraulic cylinders 8, as a result of which the ring 6 rises up and moves away from the brackets 13. At this moment the electrode 3 is kept from slipping the rings 1 by cheeks 2 by lifting the ring 6 again 3. Next, the cheeks 2 are pressed out and pressure is applied to the rodless cavities of the hydraulic cylinders 8, as a result of which the ring 6 together with the electrode 3 is lowered downwards and mounted on the brackets 13. Then the pressure is released from the hydraulic cylinders 8. Next, the direct bypass cycle shows up. The advantage of performing a direct bypass of the electrode 3 with the vertical movement of the ring 6 is that in this case the distance between the contact unit and the pressure pads of the ring decreases. bypass devices, i.e. more favorable conditions are created to maintain the vertical position of the electrode 3. The reliability of the reverse bypass of the electrode 3 in the proposed device is ensured by the fact that at the time of the bypass the electrode 3 is simultaneously clamped by two rings 1 and 6, which completely eliminates the possibility of its slipping relative to the cheeks 2 and 7. The presence of frame 5 does not increase the diametric dimension of the device. 1 6 Statistics show that the stoppage time of the furnace, for example, of type RKZ-16.5 due to unreliable operation of the device during the return bypass of the electrode during the period of annual operation averages 10 parts. When using the invention, the downtime will be absent, and in this case, the increase in productivity from one furnace will be 3.5 x 10 35 tons, where 3.5 tons is the hourly productivity of the RKZ-16.5 furnace when smelting 45% ferrosilicon. The annual economic effect from the use of the invention on the RKZ-16.5 furnaces is approximately 185 thousand rubles. Using the invention on the furnaces of ferrous, non-ferrous metallurgy and chemical industries, the total annual economic effect will be about 600 thousand rubles. The invention The device for bypassing an electrode of an electric arc furnace, comprising upper and lower pressure rings, mounted on a carrier crosshead of a hydraulic lift of an electrode holder, and vertical cylinders located between the rings, characterized in that, in order to increase the reliability of operation when the electrode is bypass upwards, it is provided a frame enclosing the electrode with vertical posts passing through the lower pressure ring and mounted on the supporting cross member of the hydraulic ram, and hydraulic cylinders are attached to the upper and lower planes of the frame coaxially. Sources of information taken into account in the examination 1.Strunsky BM Ore-smelting melting furnaces. M., Metallurgists, 1972, p. 212. 2.Gasii M.M., Self-igniting electrodes of ore recovery electric furnaces. Moscow, Metallurgists, 1976, p. 266.