DE1690556C - Device for screwing together electrodes, especially for electric arc furnaces - Google Patents

Description

The manufacturers of electrodes therefore advise against the device can be used outside of the arc

this procedure. furnace can be equipped with an electrode section,

Taking into account the described difficulties and without the presence of the operating personnel

the invention has set itself the task of requiring on the furnace roof, the electrical

a device 2 to nipple the electrode cover section to the electrode holder in the oven

to find cuts that make it possible to nipple both the electrode section located in the solution

clamping or loosening as well as turning and then removing the device again

and tightening the electrode to be nipple off. This means that they remain hazardous to health

cut can be made remotely. or adverse health effects of the

The invention is based on a device io oven operating personnel avoided,

for screwing two sections together. Used in an arc furnace or in a

a vertical carbon or graphite electrode battery consisting of several ovens at the same time

an electric furnace, in particular an electric arc, several nipple devices according to the invention

oven, a section of which is used in an oven-proof, it is also possible to connect new electrical

Electrode holder is clamped, whereby for connecting sections for one or more ovens with rela-

a screw nipple is used and the. Screw motion of great continuity., But under only little

The passage of the electrode section to be nippled on is carried out by personnel expenditure. This allows the

remotely controllable machine power is applied. Cheaper furnace operation, as wages increase

The object is inventively overall kanntlich kostenstei _t rnd to the product auswir-

! east. that d'e device two ^; <I anch each other coaxially.

orderly, with the help of a drive in the axial direction

mutually displaceable and shown with the help of a white invention. The drawing gives

teren drive against each other rotatable cylinder a vertical section through the device again,

has that the electrode to be nippled on- In an outer cylinder 1 is an inner cylinder

Section-receiving inner cylinder with clamping indentations 25 of FIG. 2 inserted telescopically at a distance. in the

directions is provided, the electrode section 3 is located at the cylinder 2 in the axial direction.

subsequent displacement of the cylinder with the help of the distance between cylinder 2 and cylinder 1

an attachment rotatably mounted on the outer cylinder follows at its upper end by means of the ring 4,

Pressing device on the electrode to be nippled on which also guides the cylinder 2 at the same time. on

section can be pressed radially, and that the outer 30 of the ring 4, a carrier 5 is arranged on which the

Cylinder against the electrode holder rotatably from the drive motor 6 is attached. This engine is standing still

is sustainable. via its slip clutch 6 α and a threaded

According to a preferred embodiment of the inventions spindle 6 b with the inner cylinder 2 in conjunction pass the clamping means from an on-making, the closure member 2 α, for this purpose furnace side end of the inner cylinder angeordne- is threaded 35th The spindle 6 ft can each slotted clamping bushing, and the pressing in after the direction of rotation the closure piece .. up and down direction is a rotatable in the outer cylinder to move and thereby moves the cylinder 2 in an orderly ring, which has a conical inner surface axially direction is provided relative to the cylinder 1. Above that having formed according to the motor, a hanging loop is attached 1 α outer surfaces of the slotted clamping sleeve in active 40 in the cylinder 1, by means of which eg. B. the whole cylinder crane connection occurs. In this way, the centering and tidying up of the nipple is achieved using a lifting device that is customary in the inner cylinder, such as a crane, onto which the outer cylinder, if it can be hoisted axially relative to the furnace or removed from it, is achieved is moved. The outer surface not far from the lower end of the cylinder 1 is in the ring can be designed as a worm wheel, 45 the interior of which is a ring 7 rotatably arranged: the inner surface la of the ring connected to a drive motor is assigned to a conical worm. forms. She stands with the appropriately trained

According to a further embodiment of the inclined surfaces 8 a of a slotted clamping sleeve 8 in

The outer cylinder is used for guidance and effective connection. The outer surface 7 ft of the ring 7

serve radial distancing of the inner cylinder- 5 ° is designed as a worm wheel, which with the on the

the ring attached, which is also a support for the axis of the motor 9 arranged worm 7 c in

forms a drive motor which is engaged via a slip.

coupling is connected to a threaded spindle, the outer cylinder 1 is at its lower end

which the axial relative displacement of the inner connected with at least two abutments Td , the

Cylinder opposite the outer cylinder causes. 55 ir appropriately designed recesses 10 α

According to a further embodiment of the invention, the end of the arc, which is only hinted at, engages the lower end of the outer cylinder with the furnace 10 . These abutments are used to provide at least two axially parallel abutments to secure the cylinder 1 from rotating when the electrodes tear in the oven-proof recesses that are appropriately designed to prevent the outer cylinder from rotating in section 3 at the end of the electrode section clamped in the oven-fixed electrical connection of the electrode section 12 - 11 is nipple. The connection between the two ovens. The upper end of the outer cylinder can be provided with electrode sections 3 and 11 by means of a hanging loop. thread nipple 13, which in the present embodiment

The invention provides the following advantages, for example being conical, but also cylindrical

aims: The device is simple and can be 65 in spite of it.

relatively inexpensive construction of high efficiency. The electrode section 3 is what comes from the light

It is also because of its very robust construction arc furnace 10 can be removed in the interior

up to the rough smelting works. The cylinder 2 pushed in. Being with the threaded tip

pel 13 provided end stands out of the outer formed oven-proof recesses 10 α in a

Cylinder 1 slightly protruded. Can be brought by pressing the handle. The tensioning motor 6 is activated via the coupling 6 a and by starting the motor 9 , the Threaded spindle 6 b of the inner cylinder 2 relative to the inner cylinder 2 including the Elcktrodenabschnitt 3 ir Cylinder 1 moved up. In this 5 rotational movement offset, the threaded nipple 12

The jaws of the tensioning electrode section 3 are moved with the end of the

sleeve 8 taken from cylinder 2. They run going Elcktrodcnabschnittes 11 connects. Through

with their outer surfaces 8a against the corresponding dimensioning of the worm drive 76,

chcnd designed conical surface la of the ring7 Ic the rotary movement is speed-

on, who thereby doses an io over the clamping sleeve jaws on the electrode section to be nipped on

radially uniform clamping pressure is transmitted to the electrical device that neither this, the connecting nip-

dcnabschnitl3 exercises, this in the cylinder 2 pel, nor the end of the preceding electrode

not only clamped, but also the center section can be damaged at the same time. The Drchmo-

is freezing. ment is always the same for all nipple processes

After completing this process, the number 15 will now be large.

After the end of the nippling process, the cylinder arrangement with the clamped in it, the inner cylinder 2 is transported downward on the furnace 10 of the motor 6 by means of a centered electrode section. This is expediently carried out with them, whereby the jaws of the Spannbüchsc8 release the tcls of a hoist, for example a crane, in electrode section 3, so that the cylinder load hooks are now attached to the outer cylinder 1 by means of the hoist from the suspension eyelet la is hung. In order to lift off the rotary nipple electrode section 3 and secure the cylinder arrangement, it is necessary, then for fitting a new electrode *, that the abutment 7 d with the corresponding section can be removed from the furnace.

1 sheet of drawings

Claims (6)

The screwing together or nippling of patent claims: Electrodes for electric arc furnaces is usually done manually. The electrodes are made of 1. Device for screwing together graphite or the like; they have a diameter of two sections of a vertical coal or 5 about 50 to 610 mm. To nipple each one Graphite electrode of an electric furnace, in particular sections of an electrode string, are conidere an electric arc furnace, one of which uses a retainer or cylindrical nipple. the cuts in an oven-proof electrode holder. A nipping process is usually carried out on the oven is tensioned, with a screw made for connection in such a way that an electrode nipple serves and the screwing movement of the anio with the help of a hoist, such as a crane nipple Electrode section by remote control, via the one in the oven-proof electrode holder Crable machine power is applied, the clamped end of an electrode strand driven through marked that the jigs will be. The electrode section to be nippled two coaxially arranged one inside the other, with is then set down and with one around it beforehand With the help of a drive (6) in the axial direction, the clamp placed around the opposite side is tightened. The tightening of each other movable and with the help of a further manual way using a ren drive (9) against each other rotatable Zy lever arm. linder (J 2) has that the to ninnelneln- It is also necessary to use a device . F'okuodenabschriiit (3) receiving inner know (German Auslegeschrift 1 OGO 708), the cylinder (2) with clamping devices (8) verse 20 uses a torque converter. The device, which in the case of the one taking place in the axial direction consists essentially of two clamps; Each die-shift of the cylinder (!, 2) m: · With the help of one of these clamps, it is attached to the connecting electrode sections, which are rotatably mounted on the outer cylinder (I). One pressing device (7) on the one of the two clamps to be nippled can be radially pressed with a toothed ring electrode section (3), 25 segments are provided, while on the other and the outer cylinder (1) a pinion rotates against the elec- tric clamp is stored. The pinion trode holder (12) rotatably can be supported. engages in the ring gear segment. By means of one on 2. Apparatus according to claim 1, characterized in that the lever arm mounted on the pinion can be one identi.-Vi that the clamping devices from the electrode section with relative movement to one at the furnace-side end <* of the inner cylinder 30, connect its fixed section to this. (2) arranged slotted clamping sleeve (8) The pinion can also be driven by a motor exist and that the pressing device will be an im. outer cylinder (1) rotatably arranged ring. (7) is the one with a conical inner surface (la) learns thin and therefore a particular risk of breakage is provided, which is provided with the correspondingly designed electrode sections by means of the deten outer surfaces (8 a) of the slotted tensioning devices, special manual equipment sleeve (8) comes into operative connection. requires skill of the furnace personnel, such a 3. Apparatus according to claim 1 or 2, da- ger nipple process also has the disadvantage that the characterized in that the furnace personnel from the electrode cooling cylinders in the outer cylinder (1) a carbon oxide and carbon dioxide gases escaping for guidance and radial distancing 40 of the inner cylinder (2) serving ring (4) is exposed and also still solidified in the hot furnace is who at the same time has to work a carrier for a atmosphere. Drive motor (6) forms, which via a slip There are also devices with remote control Coupling (6 a) with a threaded spindle (6 b) machine power to twist the screw connection is known (German utility model 1763 496 and exercise of the inner cylinder (2) compared to the USA. Patent Specification 2,322,918). But it also causes this outer cylinder (1). have to manually tighten the clamps on the furnace roof 4. Device according to one of claims 1 attached to the electrodes and after the screw 3, characterized in that the outside ben are released again. There is also a VorrichfLche (7 b) of the pressing device (7) is designed as a 5 ° device for transporting the new electrode section worm wheel, which is connected to a worm (7 c) connected to the furnace and to be screwed onto the previous drive motor (9). related section is known (USA.-Palentschrift is sorted. 2 458 272), but not for the final festival 5. Device according to one of claims 1 pulling the screw connection is suitable. through 4, characterized in that the lower 55 is because of these and similar difficulties End of the outer cylinder (1) with at least one went over for some time to the elec- two axially parallel abutments (7d) provided trode strands to be completely replaced and dated is to nipple away the furnace to prevent rotation of the outer cylinder. There are hydraulic (1) when nippling the electrode section metallic or pneumatic cylinder application; this (3) appropriately designed oven-proof fittings guarantee constant tightening measures (10 a) intervene. ments. 6. Device according to one of claims 1 Such a solution, with which the one-way 5, characterized in that the upper sentence of the operating personnel avoided in the furnace The end of the outer cylinder (1) has an opening, however, has the disadvantage that the glow hangcöse (I α) is provided. 65 cool the electrode strands continuously and thereby Cracks appear in the electrodes. Such Cracks not only have an increased electrode consumption, but also lead to broken electrodes.