DE102013213248A1 - Fixed connection of screwed electrodes - Google Patents

Abstract

Connection between carbonaceous electrodes by means of a double-conical threaded nipple to be bonded, which engages in internally threaded boxes of the electrodes to be connected, wherein at least one adhesive hole to be filled in the nipple, wherein the adhesive is part of a component with a barrier, which is inserted into the cemented hole and from which the glue can be pressed out.

Description

The invention relates to a connection between carbonaceous electrodes by means of a double-conical threaded nipple to be bonded, which engages in internally threaded boxes of the electrodes to be connected, in the transverse to the threads of the nipple and / or the electrodes of the front side of the nipple or of the box bottoms Electrode female threads from at least one groove to be filled runs.

Today the bonding of electrode and nipple is done by means of a putty. This is a mixture of special pitch (rauxolite), sulfur and graphite.

A putty is intended to bond the upper connection of the electrode strand quickly and safely and effectively prevent untwisting by the vibrations acting in the steelworks. Previously, this was possible with putties, because the electrode strand quickly became hot. For some years, however, water cooling has been increasingly used on the electrode strands in order to reduce the oxidation and thus the electrode consumption. This leads to non-effective Kittstiftverbindungen.

The special pitch Rauxolite will soon be unavailable. However, alternative pitches have the disadvantage that they are carcinogenic and putty pens made therefrom must be marked accordingly. This leads to transport and export problems when sending the monotrodes. Monotrodes are the composition of the electrode and nipple.

The object of the invention is therefore to find an alternative to putties, which also works in water cooling, is not dependent on rauxolite and is not carcinogenic.

Furthermore, an additional safeguard against loosening of a screw connection must be ensured, which is effective immediately when the electrode string is put into operation. The fuse should be protected against environmental influences (humidity, temperature fluctuations from -20 ° C to + 80 ° C, mechanical loads). Furthermore, the backup in a nipple hole of 70 mm depth (measured from the base of the thread) and a diameter of 50 mm find space.

The object is achieved by the features of claims 1 to 7.

The invention relates to a connection between carbonaceous electrodes by means of a double-conical threaded nipple to be bonded, which engages in internally threaded boxes of the electrodes to be connected, wherein in the nipple there is at least one adhesive to be filled with a putty hole, wherein the adhesive is part of a component with a lock, the is inserted into the putty hole and from which the adhesive can be pressed out.

By properly selecting a material for the barrier with a well-defined melting point, it can be guaranteed that the system will only be activated when it is used at a desired temperature and not during storage.

Basically, a putty on a nipple half is sufficient. Conveniently, two or more putty holes are arranged symmetrically distributed around the Nippelumfang.

The adhesive is particularly preferably prevented from being squeezed out by a mechanical lock until the mechanical lock melts.

Preferably, the mechanical barrier consists of a locking ring and the material for the mechanical barrier of polyethylene (PE), acrylonitrile-butadiene-styrene (ABS) or acrylic ester-styrene-acrylonitrile (ASA). The polyethylene is particularly preferably depending on the application PE high density (crystallite melting point 125-140 ° C) or low density PE (crystalline melting point 105-115 ° C).

The upper service temperature of PE low density is 60-90 ° C. The upper service temperature of PE high density is up to 95 ° C, but may be higher in the short term. In the cold, embrittlement occurs only at about -50 ° C, even lower at higher molar mass. For ABS, the softening point is 95-110 ° C, at ASA, z. B. Luran ^® S from BASF, the softening point is> 100 ° C.

Also preferred are materials such as orodispersible tablets which melt at a certain temperature and irreversibly indicate the exceeding of a certain temperature during firing processes or special plastics which have defined melting points.

The exact melting point must be determined on a case-by-case basis by experiment, but should normally be around 90 to 110 ° C, since the melting point must be higher than the temperatures that can occur even when storing the electrodes in hot areas of the world.

The adhesive is most preferably a liquid-liquid component adhesive consisting of two components (2K), which are preferably acrylic resins. This gives a high carbon content. The individual components of a two-component adhesive are separated and stored sealed from the environment.

Preferably, the adhesive may also be a 2-part door frame quick foam of, for example, E-Coll, which advantageously foams up like the conventional putty pins, or a 2-component fast-epoxy adhesive of, for example, E-Coll, which is temperature-resistant from -40 to + 100 ° C , so it is suitable for practically all climatic zones of the world.

The mechanical barrier melts preferably at 80 ° C to 120 ° C, and more preferably at 90 ° C to 110 ° C. The melting of the barrier at a certain temperature is essential to the present invention. The mechanical lock, particularly preferably a spring, is stretched and, in use, pushes the two individual components through a mixing nozzle so that the bond is activated.

The invention further relates to a component for connecting carbon-containing electrodes, wherein as individual parts a) chambers for safe storage of the individual components of the two-component adhesive; b) a mixing device for mixing the components; c) a tensioned spring, d) a mechanical lock and e) a stamp plate are used.

The cartridge dimensions of the component are particularly preferably chosen with a diameter of 36.5 mm and a length of 63.5 mm as in the conventional putty pin.

The component is preferably used for connecting carbon-containing electrodes in the compound according to the invention.

When cold, a locking ring holds the spring tensioned, which is located below the stamp plate. The stamp plate above the spring is held by a locking ring. The locking ring is preferably made of a special plastic as described above, which melts at a defined temperature.

In the stressed state, the adhesive components are in separate chambers for safe storage of the individual components of the two-component adhesive. Above the chambers there is a mixing device for mixing the individual components. Above this is an outlet, particularly preferably in the form of a perforated disc.

After exceeding a desired temperature, the locking ring loses its strength. This allows the spring to relax. The two components of the adhesive are now forced through the mixing nozzle via the exit into a thread. The bonding is defined by the two-component adhesive and not by temperature as in conventional putty. The bonding is thus completed after a much shorter time. Furthermore, there is no obligation to label the materials used according to the invention.

Description of the figures:

In 1 is exemplified a cartridge with dimensions analogous to the putty with a diameter of 36.5 mm and a length of 63.5 mm. When cold, a locking ring ( 4 ) a feather ( 6 ) curious; excited. The locking ring ( 4 ) is made of a special plastic that melts at a defined temperature.

After exceeding the defined temperature the locking ring loses ( 4 ) its strength, the spring ( 6 ) can relax. Both adhesive components are replaced by the compulsory mixing element ( 2 ) about an exit ( 1 ) pressed into a thread. The thread then sticks after a short time.

LIST OF REFERENCE NUMBERS

1

Exit (perforated disc)

2

Forced mixing element

3

Two-component adhesive

4

lock ring

5

stamp plate

6

feather

Claims (7)

Connection between carbonaceous electrodes by means of a double conical threaded nipple to be bonded, which engages in internally threaded boxes of the electrodes to be connected, in which at least one cemented hole to be filled with adhesive is present in the nipple, characterized in that the adhesive is part of a component having a barrier which is inserted into the Kittloch is used and from which the adhesive can be pressed out. A compound according to claim 1, characterized in that the adhesive is prevented by a mechanical lock in the component at the pressing out until the mechanical lock melts. A compound according to claim 2, characterized in that the mechanical barrier in the component consists of a locking ring and that the material for the mechanical barrier of polyethylene (PE), acrylonitrile-butadiene-styrene (ABS) or acrylic ester-styrene-acrylonitrile (ASA) consists , A compound according to one or more of claims 1 to 3, characterized in that the Adhesive consists of two components and that the components are acrylic resins. Compound according to one or more of claims 1 to 4, characterized in that the mechanical barrier at 80 ° C to 120 ° C and more preferably at 90 ° C to 110 ° C melts. Component for connecting carbonaceous electrodes, characterized in that as individual parts a) chambers for safe storage of the individual components of the two-component adhesive; b) a mixing device for mixing the components; c) a tensioned spring and d) a mechanical lock are included. Component for connecting carbonaceous electrodes according to claim 6, characterized in that it is used in the compound according to one or more of claims 1 to 5.

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