SU1741294A1 - Electric contact assembly of electric arc furnace - Google Patents

Abstract

Use: arc furnace for smelting metal. Summary of the invention: a groove is made on the outer surface of each contact cheek. In the groove installed protrusions mating groove form two segments. The segments serve to press the contact cheeks to the electrode. The groove in each cheek can be made in the form of a dovetail. 1 hp ff-lg, 8 ill. chug yag yo

Description

The invention relates to electrical engineering.

The aim of the invention is to improve the maintainability.

 Figure 1 shows the electrical contact node, a general view; figure 2 shows a section aa in figure 1; FIG. 3 shows the node I (the connection node of the cable with the power mechanism) in FIG. on fig.k shows a view along arrow B in figure 2; figure 5 shows a view along arrow B in figure 2; figure 6 shows a section of the GG in figure 4; 7 is shown. section dD in figure 5; in figure 8 noka-ean contact cheek suspension assembly.

The electric node of the electric arc furnace contains contact cheeks 1 located with a gap around electrode 2 and covering their segments 3, the number of which is equal to the number of cheeks 1. 8 each cheek 1 on the side of the outer surface at the level of contact with segment 3 has a central longitudinal groove k with lateral inclined surfaces 5. Each segment 3 is made with protrusions 6 on edges with inclined surfaces 7 in contact with inclined surfaces 5 of the cheeks 1 and repeating their profile. Segments 3 are installed ta§

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2

3

in this way, that in each groove there are protrusions 6 of two adjacent segments (see Fig.2). The groove in the cross section is made in the form of a dovetail, and the projections introduced into it 6 segments 3 correspond to its shape “

The contact jaw 1 is suspended by means of a vertical suspension 8 to the carrying case 9. The current supply tubes 10 of the contact jaws 1 extend between the upper edge of the segments 3 and the lower edge of the carrying case 9. Each segment 3 is provided with a vertical pull 11, which in turn is connected to mechanism of its vertical movement. The design of the mechanism for the vertical movement of the rod 11 can be made either with an electromechanical drive, or in the form of springs, as well as a spring-like type. In this case, the last variant is proposed, when a vertically located hydraulic cylinder 13 is attached to the bearing housing with a bracket 12, under the piston AND of the hydraulic cylinder 13, i.e. in the rod (cavity), a spring 15 is placed, the preloading of which is performed by a nut 16. A stem P is connected to a pull 11.

The groove k is made for ease of insertion of the protrusions 6 of the segments 3 in the lower part with an extension (see Fig.).

Electrocontact node arc.

electric furnace works as follows "

In the working position, the projections 6 of the segments 3 are inserted into the grooves L of the contact cheeks with the fit of the inclined surfaces 5 and 7.

When simultaneously or oppositely paired by tightening the nuts 16, the springs 15, located in the rod end, for example, pneumatic cylinders, transmit a force to the piston 1, which moves upwards, the thrusts 11, and together with them the segments 3 to this movement of the contact cheeks T upwards prepares There are vertical stops-suspension 8 (see Fig.6). When lifting the segments 3, the adjacent contact cheeks 1 are pulled together to each other due to the contact between the inclined surfaces 7 of the segments 3 and the inclined surfaces of the 5 contact cheeks 1. When the cheeks 1 are tightened, the circumference along the contact contour decreases.

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cheek surfaces 1, i.e. the contact cheeks 1 move to the center of the electrode 2, increasing the pressing force of the cheeks 1 against the electrode and reducing the joint gap between adjacent cheeks 1.

Thus, when tension is applied in the vertical rods 17 on the lateral inclined surfaces 5, oppositely directed tangential forces are acting, the resultant of which is directed to the center of the electrode 2

Springs 15 are adjusted so

5 in order to transfer the same constant forces to all segments 3. To relieve the forces in the cheek-electrode contact, it is sufficient to apply pressure in the rodless cavity of the pneumatic cylinders 13, resulting in compression of the springs 15 and lowering of the segments 3 "Segments 3 can be made cast of low-magnetic steel with internal air-cooled cavities with an internal partition.

The segment thickness does not exceed 80 mm. Segments 3 can also be made non-cooled from magnetic steel. Thus, the proposed design of an electrocontact node, compared with the known solutions, significantly reduces the diameter of the node.

Reducing the diametrical dimension improves charge loading conditions around the electrode (the charged height of the working end of electrode 2 increases) and allows, if necessary, to arrange the electrodes with the minimum diameter of the decomposition required by the alloy melting technology,. electrodes 2 (for example, in electric furnaces for smelting crystalline silicon, silicocalcium, etc.).

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The proposed construction is highly repairable, since if it is necessary to replace a broken contact cheek 1, it is enough to dismantle two adjacent segments 3. Segments 3 are dismantled as follows: first, detach the rods 11 and lower the projections 6 with the inclined segments down. surfaces 5 of groove A of contact cheek 1, after which contact cheek 1 is open for dismantling51

The inclined surfaces 5 in the cheek J diverge upwards, and the inclined surfaces 7 of the segment 3 diverge at the same downward angle. Slope surface 7 as well as geometric size

5 and

the protrusions 6 are determined by mechanical calculation depending on the calculated specific pressure at the cheek-electrode contact.

Most appropriately, the central groove k in the cheek t in cross section can be made in the form of a dovetail t. The hook as such a shape ensures a reliable mating of the surfaces.

The proposed construction can be used both in open electric furnaces and in semi-closed and closed ones.

In closed furnaces, i.e. With electrolyte holders sealed in the roof, the role of the sealing cylinder is performed by the segments 3, which form a cylindrical surface around the contact jaws 1. The height of segments 3 is determined; the magnitude of the vertical stroke of the electrode 2.

The advantage of the proposed device is that instead of installing a massive pressure ring

The individual segments 3 are installed, the thickness of which is k - 5 times smaller than the width of the pressure ring.

Claims (1)

Invention Formula {.The electric arc furnace assembly containing contact the cheeks with the outer inclined surface associated with the clamping elements according to the number of contact cheeks connected to the vertical thrusts, about the fact that with the aim of increase maintainability and reduce the diametrical size, in each contact cheek on the outer surface at the level of contact with the clamping element made central the longitudinal, groove, e clamping elements are made in the form of segments with protrusions on the edges and are installed in such a way that the projections of two segments are installed in the groove of each cheek, moreover, the shape of the protrusions corresponds to the shape of the groove, 1. The knot is in ((yd otlicha yushchu and with the fact that the central groove of each cheek is made about a cross section in the shape of $ dovetail , AND Fig1 BUT-" QtozJ t 2 four t nt