DE1690556B2 - DEVICE FOR SCREWING ELECTRODES TOGETHER, IN PARTICULAR FOR ELECTRIC ARC FURNACE - Google Patents

Description

outer cylinder (1) rotatably arranged ring.

(7), which is provided with a conical inner surface (Ta) which is thin and therefore has a particular risk of breakage, which with the correspondingly designed electrode sections using the intended outer surfaces (8 a) of the slotted tensioning devices, special manual bushings (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 as 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 ft) machine power to tighten the screw connection is connected, which the axial relative displacement 45 is known (German utility model 1 763 496 and Exercise of the inner cylinder (2) versus U.S. Patent 2,322,918). But also with these outer cylinder (1) causes. 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 Vorrichfläche (7 h) of the pressing device (7) is designed as a 5 ° device for transporting the new electrode section worm gear, 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.-Patent. 2 458 272), but not for the final celebration

5. Device according to one of claims 1 pulling the screw connection is suitable.

to 4, characterized in that the lower 55. Because of these and similar difficulties, the end of the outer cylinder (1) has at least for some time gone over to completely replacing the two axially parallel abutments ( 7d) provided with electrode strands and from which to Rotary lock of the outer cylinder to be nipple removed from the furnace. There are hydraulic (1) when nippling the electrode section or pneumatic cylinder application; these

(3) Intervening in appropriately designed oven-proof fittings 60 guarantee constant tightening measures (10 a) . ments.

6. Device according to one of claims 1 Such a solution, with which, although the Einis5, dadurcli indicated that the upper sentence of the operating personnel avoided the furnace End of the outer cylinder (1) with an opening, however, has the disadvantage that the glow hanging loop (1 α) is provided. 65 continuously cool the electrode strands and this causes cracks to appear in the electrodes. Such

Cracks not only have an increased consumption of electrodes, also lead to broken electrodes.

3 4

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 for nippling the electrode cap 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 nippled. 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 from 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 movement has great continuity, but only minimally

The electrode section to be nippled is covered by personnel expenditure

Fl-controllable machine power is applied. Cheaper furnace operation, Cn labor wages

According to the invention, the task may thereby have a cost-increasing effect on the product.

solves. that the device two ken coaxially in one another.

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

gates η 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.

iMick device on the electrode to be nipped 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 his slip clutch 6 a and a threaded

According to a preferred embodiment of the inventions spindle 6 b with the inner cylinder 2 in conjunction pass the Klemn.'einrichtungen from an on-making, the closure member 2 α, for this purpose efenseitigen end of the inner cylinder angeordne- is threaded 35th The spindle 6 b can each punched: slotted clamping bushing, and the pressure inward to rotate the locking 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 in the axial direction Relative to the cylinder 1. Above provided> st, which is attached to the correspondingly designed of the engine in the cylinder 1 a suspension eyelet 1 a outer surfaces of the slotted clamping sleeve in operative 40, by means of which z. B. occurs the whole cylinder connection. In this way, the centering and tidying up of the nipple is done 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 in the axial direction relative to the furnace or removed from it, is achieved is moved. The outer surface not far from the lower end of the cylinder I is in the ring can be designed as a worm wheel, 45 the inside of which is a ring 7 rotatably arranged: the inner surface Ία of the ring connected to a drive motor is associated with a conical worm. forms. She stands with the appropriately trained

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

in the outer cylinder is a guide and an operative connection. The outer surface Tb of the ring?

serve radial distancing of the inner cylinder- 50 is designed as a worm wheel with the one on the

the ring attached, which also has a support for the axis of the motor9 arranged screw Ic im

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 Id , the

Cylinder opposite the outer cylinder causes. 55 in correspondingly formed 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. This abutment serve at least two axially parallel abutments provided, rotation of the cylinder 1 when the Elektrodendie to the rotation of the outer cylinder at section 3 at the end of the oven-proof electric nippling the electrode section accordingly formed in entspre-.6o denfassung ti clamped electrode portion ovenable recesses engaging 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 cylinder2 pushed in. Being with the thread

Pel 13 provided end protrudes slightly from the outer cylinder 1. By actuating the tensioning motor 6 is transmitted via the clutch 6 and a Gevindespindel the inner cylinder 2 shifted 6b relative to the cylinder 1 upward. During this shifting movement, the jaws of the clamping sleeve are taken along by the cylinder 2. They run with their outer surfaces 8 a against the correspondingly formed conical surface 7 a of the ring 7, which thereby exerts a radially even clamping pressure on the electrode section 3 via the clamping sleeve jaws, whereby this is not only clamped in the cylinder 2, but also centered at the same time .

After this process has been completed, the cylinder arrangement with the electrode section clamped and centered in it is transported onto the furnace 10. This is expediently done by means of a hoist, for example a crane, in whose load hook the suspension eyelet 1 α attached to the outer cylinder 1 is suspended. To secure the cylinder arrangement against rotation, it is necessary that the abutments Id are brought into engagement with the correspondingly designed oven-fixed recesses 10 a.

By starting the motor 9, the inner cylinder 2 together with the electrode section 3 is set in rotary motion, the threaded nipple 13 connecting the electrode section 3 to the end of the preceding electrode section 11. By appropriately dimensioning the worm drive Tb, Ic , the rotational movement is transmitted to the nipple-to-be-nippled electrode section with dosed speed in such a way that neither this, the connecting nipple, nor the end of the preceding electrode section can be damaged. The torque is always the same in all nipple processes.

After the end of the nipping process, the inner cylinder 2 is moved downwards by means of the motor 6, whereby the jaws of the clamping sleeve 8 release the electrode section 3, so that the cylinder

ao arrangement is now lifted from the nipple electrode section 3 by means of the hoist and can then be removed from the furnace for fitting with a new electrode section.

1 sheet of drawings

Claims (2)

] 690 556 The screwing together or nippling of patent claims: Electrodes for electric arc furnaces are 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 carbon or 5 about 50 to 610 mm. To nipple the individual graphite electrodes of an electric furnace, in particular sections of an electrode strand, cones of an electric arc furnace, one of which is a retainer or cylindrical nipple, are used to connect a screw made in such a way that an electrode nipple is used and the screwing movement of the an- io cut is clamped in place with the help of a hoist, such as a crane nipple electrode section by remote control, via which machine force can be detected in the oven-fixed electrode holder The end of an electrode string is characterized by the fact that the Vonich- ren. The electrode section to be nippled is two coaxially arranged one inside the other, is then set down and tightened with a clamp previously placed around it with the aid of a drive (6) in the axial direction. Tightening ereinander displaceable and with the help of a manual weite- following way using a ren Antri ¹ ^ s (9) rotatable against one another ZY lever arm. linder (1, 2) has that the to be nipple- It is also possible to use a device The inner electrode section (3) receiving the electrode (German Auslegeschrift 1 080 708), which is Cylinder (2) operated with clamping devices (8) verse 20 of a torque converter. The device hen is, which in the case of the axial direction consists essentially of two clamps; every die-shift the cylinder (1, 2) with the help of a water clamp is on the veram with each other outer cylinder (1) attached to rotatably mounted connecting electrode sections. The one The pushing device (7) on the two clamps to be nippled is provided with a toothed ring electrode section (3) can be pressed radially, »5 segments are provided, while a pinion is rotatably mounted on the other and that the outer cylinder (1) against the elec- tric clamp. The pinion electrode holder (12) can be rotatably 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 indicates that the K! -mm devices from electrode section with relative movement to one at the end of the inner cylinder 30 on the furnace side, connect the fixed section thereof to the latter. (2) arranged slotted ti clamping sleeve (8) The pinion can also be driven by a motor exist and that the pressing device will be an im.