DE102018220594A1 - Device and method for holding an electrode support arm - Google Patents

Abstract

The invention relates to a device (10) and a method for holding an electrode support arm (11). The device (10) comprises a guide column (12) with a guide column head (13), insulation (15) attached to an upper side (16) of the guide column head, and screwing means (18) with which the electrode support arm (11) can be attached to the guide column head (13), the insulation (15) being located between the guide column head (13) and the electrode support arm (11) when the electrode support arm (11) is attached to the guide column head (13). The screwing means (18) are formed in two parts and consist of at least a first connecting bolt (19), with which the insulation (15) on the top (16) of the column head can be fastened, and at least a second connecting bolt (22), one in the Electrode support arm (11) formed through vertical hole (23) passes through and can be screwed with its lower end (24) into a head (20) of the first connecting bolt (19).

Description

The invention relates to a device for holding an electrode support arm according to the preamble of claim 1, and a corresponding method for this purpose.

• - Die Elektrodentragarme werden in der Regel mit drei Schraubenbolzen (ein Schraubenbolzen auf der Druckseite und zwei Schraubenbolzen auf der Zugseite) mit einem T-förmigen Führungssäulenkopf verbunden. Hierzu verfügen die Elektrodentragarme an der Unterseite über je drei (Fein-)Gewindesacklöcher. Die Verbindungen werden über Vorspannmuttern vorgespannt, um ein Abheben der Elektrodentragarme zu verhindern, bzw. den nötigen Reibschluss, welcher erforderlich ist, um horizontale Belastungen aufzunehmen (z.B. beim Kippen des EAF's, oder durch strombedingte Kräfte), zu gewährleisten. Die Vorspannmuttern befinden sich auf der Unterseite der Führungssäulenköpfe.
• - Die vorstehend genannten Schraubenverbindungen werden elektrisch isoliert ausgeführt (Hülsen und Scheiben aus Hartglasgewebe). Die Elektrodentragarme selbst werden durch je eine durchgehende Isolierplatte aus Hartglasgewebe gegenüber den Führungssäulen elektrisch getrennt.
• - Zur Ausrichtung der Elektrodentragarme (z.B. zur Einrichtung des gewünschten Elektrodenteilkreisdurchmessers) verfügen die Durchgangslöcher in den Führungssäulenköpfen über Spiel (Größenordnung 25 mm), so dass eine horizontale Verschiebung in x und y bzw. eine Verdrehung in der entsprechenden Ebene möglich ist. Zur Ausrichtung der Elektrodentragarme, gegenüber den Führungssäulenköpfen werden Hilfsmittel, wie z.B. Abdrückschrauben, eingesetzt die die elektrische Isolierung der beiden Baugruppen brücken.

In the field of steel production, guide column-electrode support arm connections are known according to the prior art for holding electrodes (for example, arc furnaces), the common design features of which are as follows:

• - The electrode support arms are usually connected to a T-shaped guide column head with three screw bolts (one screw bolt on the pressure side and two screw bolts on the tension side). For this purpose, the electrode support arms have three (fine) threaded blind holes on the underside. The connections are pretensioned using preload nuts to prevent the electrode support arms from lifting off or to ensure the necessary frictional connection which is required to absorb horizontal loads (e.g. when the EAF tilts or due to current-related forces). The preload nuts are located on the underside of the column heads.
• - The screw connections mentioned above are electrically isolated (sleeves and washers made of hard glass fabric). The electrode support arms themselves are electrically separated from the guide columns by a continuous insulating plate made of hard glass fabric.
• - To align the electrode support arms (e.g. to set up the desired electrode pitch circle diameter), the through holes in the guide column heads have clearance (order of magnitude 25 mm), so that horizontal displacement in x and y or rotation in the corresponding plane is possible. Aids such as jack screws are used to align the electrode support arms with respect to the guide column heads, which bridge the electrical insulation of the two modules.

Furthermore, conventional devices for holding electrodes are known, in which a bolt is provided through the electrode support arm in order to secure the insulation to an underlying plate, the plate itself being screwed to the column head.

• - Die Gewindesacklöcher in den Elektrodentragarmen (in der Regel Feingewinde) sind verschmutzungsanfällig, was häufig zum Verklemmen/ Fressen der Schraubenbolzen beim Ein- bzw. Ausschrauben führt. Die dabei entstehenden Schäden an diesen Gewinden müssen oft durch mechanische Bearbeitung behoben werden.
• - Führungssäulen und Elektrodentragarme können nicht vormontiert werden, d.h. die Montage erfolgt erst am Ofen. Dazu müssen die schweren Vorspannmuttern über Kopf (Zwangslage) platziert und angeschraubt werden, was in der Regel kraft- und zeitraubend ist.
• - Das Durchmesserspiel in den Durchgangsbohrungen, zur Ausrichtung der Elektrodentragarme, hat eine deutlich ungünstige Krafteinleitung von der Vorspannmutterauflage, über die Isolierscheibe und der das Spiel brückenden Edelstahlunterlegscheibe, in den Führungssäulenkopf zur Folge, was oft dazu führt das sich die Unterlegscheibe beim Anziehen der Verbindung konisch verformt.
• - Die elektrische Isolierung der Führungssäulen-Elektrodentragarm-Verbindung muss bei Montage mit Silikonpaste gegen das Eindringen von Staub und ggf. auch ausgetretenem Kühlwasser abgedichtet werden. Dadurch bedingt lassen sich die Elektrodentragarme nur so lange noch ausrichten, wie die Silikonpaste noch fließfähig ist. Jeder spätere Ausrichtversuch führt zu Zerstörung der Abdichtung. Zudem muss das Silikon nach jeder Demontage der Elektrodentragarme zunächst entfernt bzw. bei Wiedermontage neu aufgetragen werden.
• - Die Justiereinrichtungen müssen vor Inbetriebnahme zwingend entfernt werden, weil diese die Isolierung der Führungssäule-Elektrodentragarm-Verbindung brücken.

The above-mentioned prior art for holding an electrode support arm has various disadvantages:

• - The threaded blind holes in the electrode support arms (usually fine threads) are susceptible to contamination, which often leads to jamming / seizing of the screw bolts when screwing in or unscrewing. The resulting damage to these threads often has to be remedied by mechanical processing.
• - Guide columns and electrode support arms cannot be preassembled, ie they are only installed on the furnace. To do this, the heavy preload nuts have to be placed overhead and screwed on, which is usually time-consuming and time-consuming.
• - The diameter play in the through holes, for aligning the electrode support arms, results in a clearly unfavorable introduction of force from the preload nut over the insulating washer and the stainless steel washer bridging the play into the guide column head, which often leads to the washer being conical when the connection is tightened deformed.
• - When assembling with silicone paste, the electrical insulation of the guide column-electrode support arm connection must be sealed against the ingress of dust and possibly leaked cooling water. As a result, the electrode support arms can only be aligned as long as the silicone paste is still flowable. Any subsequent alignment attempt will destroy the seal. In addition, the silicone must first be removed after each removal of the electrode support arms or reapplied when reassembling.
• - The adjustment devices must be removed before commissioning because they bridge the insulation of the guide column-electrode support arm connection.

The invention is therefore based on the object of simplifying the assembly and disassembly of an electrode support arm and, in the course thereof, of also improving or optimizing its positioning on a holding element.

This object is achieved by a device having the features of claim 1 and by a method specified by the features of claim 15. Advantageous developments of the invention are defined in the dependent claims.

A device according to the present invention serves to hold an electrode support arm or to position it on a holding device provided for this purpose. The device comprises a holding device in the form of a guide column with a guide column head, an insulation, which is attached to an upper side of the column head, and screwing means with which the electrode support arm can be fastened to the column head. If the electrode support arm is attached to the guide column head, the insulation is between the guide column head and the electrode support arm. The mentioned screwing means are formed in two parts and consist of at least a first connecting bolt, with which the insulation can be attached to the top of the column head, and at least a second connecting bolt, which passes through a vertical through hole formed in the electrode support arm and with its lower end in a head of the first connecting bolt can be screwed in.

1. (i) Bereitstellen einer Führungssäule mit einem Führungssäulenkopf,
2. (ii) Befestigen einer Isolierung an einer Oberseite des Führungssäulenkopfes vorzugsweise mittels einer ersten Verschraubung, wodurch die Führungssäule und die Isolierung zu einer vormontierten Einheit miteinander verbunden werden,
3. (iii) In-Kontakt-Bringen der vormontierten Einheit bestehend aus der Führungssäule und der an einer Oberseite des Führungssäulenkopfes befestigten Isolierung mit dem Elektrodentragarm, derart, dass der Elektrodentragarm von oben auf den Führungssäulenkopf aufgesetzt bzw. der Führungssäulenkopf von unten in Kontakt mit einer Unterseite des Elektrodentragarms gebracht wird, und
4. (iv) Befestigen des Elektrodentragarms an bzw. auf dem Führungssäulenkopf vorzugsweise mittels einer zweiten Verschraubung, die mit einem Teil der ersten Verschraubung verbunden wird.

The present invention also provides a method for holding an electrode support arm, in which the electrode support arm is attached or firmly positioned on a suitable holding device. This procedure includes the following steps:

1. (i) providing a column with a column head,
2. (ii) fastening an insulation to an upper side of the column head, preferably by means of a first screw connection, whereby the column and the insulation are connected to one another in a preassembled unit,
3. (iii) bringing the preassembled unit consisting of the guide column and the insulation fastened to an upper side of the guide column head into contact with the electrode support arm such that the electrode support arm is placed on the guide column head from above or the guide column head comes into contact with a bottom side from below the electrode arm is brought, and
4. (iv) Fastening the electrode support arm to or on the guide column head preferably by means of a second screw connection which is connected to a part of the first screw connection.

In an advantageous development of the method just mentioned, a plate-shaped element can be attached to the insulation in step (ii). Here, the plate-shaped element with the first screw connection is fastened together with the insulation to the top of the guide column head, the underside of the electrode support arm coming into contact with the plate-shaped element in step (iii).

The invention is based on the essential finding that, owing to the two-part screwing means, it is possible to first attach the necessary insulation to the top of the column head, before in a further step the electrode support arm is then attached or fastened to the column head. With the aid of at least a first connecting bolt or the first screw connection, the insulation is first attached to the top of the guide column head, whereby the guide column with its guide column head and the insulation attached to it form a preassembled unit. Only then is the electrode support arm attached to the guide column head with at least one second connection bolt or the second screw connection in a next step, by the lower free end of the second connection bolt being passed through a through hole formed in the electrode support arm and passing through the electrode support arm from the top to the bottom thereof. passed and screwed into the head of the first connecting bolt. In this way, on the one hand, the insulation can be attached to the top of the guide column head and, on the other hand, the attachment of the electrode support arm to the guide column head can be carried out separately from one another.

Thanks to the possibility of pre-assembling the insulation on the top of the guide column head and only then attaching the electrode support arm to the guide column head, the present invention has the essential advantage that the entire assembly of the electrode support arm is simplified and in particular without constrained positions or overhead -Work can be done. Eliminating the assembly of heavy components in a forced position also improves occupational safety for fastening the electrode support arm to a holder in the form of the guide column head.

Another advantage of the present invention is that the electrode support arm can be dismantled from the guide column head as often as required and re-installed again without having to remove the insulation from the top of the guide column head. On the one hand, this leads to faster assembly and disassembly of the electrode support arm and, on the other hand, makes an expensive readjustment of the insulation on the upper side of the column head obsolete.

In an advantageous development of the invention, a plate-shaped element can be applied to an upper side of the insulation. This plate-shaped element primarily serves to protect the insulation. For this purpose, it is expedient if the plate-shaped element with its outer dimensions is adapted to the insulation or the top of the column head. When the insulation and the plate-shaped element are fastened to the guide column head, the head of the first connecting bolt sits on the top of the plate-shaped element, whereby the flow of force in the direction of the column head is improved. In any case, the pressure is absorbed by the head of the first connecting bolt through the plate-shaped element and thus the insulation is less stressed. If the electrode support arm is attached to the column head, an underside of the electrode support arm is in contact with the plate-shaped element.

In the simplest case, the plate-shaped element can consist of a normal steel plate, which is inexpensive to produce. Such a steel plate is suitable for use e.g. in low-performance arc furnaces.

To reduce the influence of a magnetic field which occurs when current is applied to an electrode held by the electrode support arm, i.e. To reduce the inductive heating of the guide column and the guide column head held by it, it can be provided according to an advantageous development of the invention that the plate-shaped element is either antimagnetic or has antimagnetic properties. This can e.g. can be achieved by using the materials copper or aluminum. Possible embodiments of the invention provide that the plate-shaped element is either made from these materials or at least is clad on its outer surfaces with these materials.

In an advantageous development of the invention, the plate-shaped element can be conductive or have a conductive material. For example, this conductivity is given for the cited example of copper, from which the plate-shaped element is made or with which this plate is at least placed.

If the plate-shaped element has antimagnetic and / or conductive properties, this can advantageously prevent or at least reduce inductive heating of the guide column head and the guide column connected to it, in particular in the case of powerful arc furnaces.

Regardless of the nature of the plate-shaped element, it is important in the context of the present invention that this plate-shaped element, if such a device is provided, also belongs to the preassembled unit and is also fastened to the top of the guide column head by means of the first connecting bolt or the first screw connection is.

In an advantageous development of the invention, the head of the first connecting bolt can have an enlarged diameter in comparison to its shank region, this head being arranged on the top of the guide column head. This leads to the advantage of a reliable mounting of the insulation on or on the top of the guide column head and an improved flow of force in the direction of the guide column head, because the head of the first connecting bolt, thanks to its enlarged diameter, is like a washer or washer e.g. places on the plate-shaped element.

The second connecting bolt can be fastened to the electrode carrier arm in a simple and robust manner by this connecting bolt passing through a through hole formed in the electrode carrier arm. Here, the inside diameter of this through hole is suitably adapted to the outside diameter of the second connecting bolt, in such a way that the second connecting bolt can be inserted into the through hole without interference and without jamming. This is preferably done from above, i.e. from an upper opening of this through hole.

In an advantageous development of the invention, a pressure sleeve can be accommodated in the through hole which is formed in the electrode support arm and extends essentially over the length of the through hole. In this case, an inner diameter of the pressure sleeve is adapted to the outer diameter of the second connecting bolt in such a way that the second connecting bolt can be inserted into the pressure sleeve, preferably from above, without interference and without jamming. The pressure sleeve leads to the advantage that compressive stresses are absorbed thereby and thereby the component stresses that can arise within the electrode support arm by tightening or tensioning the second connecting bolt are at least reduced.

The invention also leads to the advantage that assembly of the electrode support arm or its positioning on the guide column head can be carried out with greater precision compared to the prior art before final fixing. This is achieved according to the invention in that the through hole which is formed in the electrode support arm has an enlarged inner diameter adjacent to an underside of the electrode support arm opposite the guide column head, which is adapted at least to an outer diameter of the head of a first connecting bolt. This enlarged inner diameter of the through hole adjacent to the underside of the electrode support arm is preferably larger than the outer diameter of the head of a first connecting bolt. As a result, when the electrode support arm is placed on the guide column head, an annular gap is formed between the enlarged inner diameter of the through hole adjacent to the underside of the electrode support arm and the head of the first connecting bolt. Before the second connecting bolt is tightened or pretensioned, this annular gap can first be used to align the electrode support arm with a horizontal displacement in an xy plane. Only after a predetermined or desired position of the electrode support arm relative to the guide column head has been reached is the second connecting bolt tightened or pretensioned in order to use the electrode support arm firmly with the guide column head or to fasten it to it.

The first connecting bolt can be screwed to the guide column head or the second connecting bolt can be screwed to the electrode support arm by using nuts which are screwed onto a lower free end of the first connecting bolt or an upper free end of the second connecting bolt. These nuts can expediently be tightened with the aid of a hydraulic tool and / or can be designed in the form of preload nuts.

If the two-part screwing means, namely in the form of the first connecting bolt and the second connecting bolt, are connected to one another, these two bolts fulfill the function of an expansion shaft with which the quality of the prestressed screw connection is increased. This results in an improvement for the introduction of force and the flow of force when attaching an electrode support arm to the guide column head, and thus also enables use for electrode support arm of powerful arc furnaces or EAFs.

With regard to the aforementioned method according to the present invention, it goes without saying that this can also be carried out with a device according to the invention.

• - Keine Montage von schweren Bauteilen (z.B. der Elektrodentragarme) unter Zwangslage (über Kopf).
• - Direkter Kraftfluss, d.h. keine Biegebelastung auf die leitfähige, antimagnetische Platte.
• - Einfache und schnelle Ausrichtung und Montage der Elektrodentragarme.
• - Nur noch geringe Biegebelastung der Edelstahlunterlegscheiben.
• - Einfache Justiermöglichkeit, welche die Isolation nicht überbrückt.
• - Deutliche Verringerung der Gesamt-Montagezeit (u.a. wegen der Vormontage des Teil-Systems „Führungssäule-Isolierung-Antimagnetische- und-leitfähige-Platte“).
• - Schnellerer Wechsel der Elektrodentragarme möglich, ohne dabei jedes Mal auch die Isolierung demontieren bzw. montieren zu müssen.
• - Auf Grund der Verbesserung der Krafteinleitung und des Kraftflusses sowie der Verlängerung des Dehnschaftes der Schraubenbolzen lässt sich die erfindungsgemäße Vorrichtung auch für Elektrodentragarme leistungsstarker EAF's einsetzen.

Further advantages of the present invention are formed by the following aspects:

• - No assembly of heavy components (e.g. the electrode support arms) in a forced position (overhead).
• - Direct flow of force, ie no bending stress on the conductive, non-magnetic plate.
• - Simple and quick alignment and assembly of the electrode support arms.
• - Only slight bending stress on the stainless steel washers.
• - Simple adjustment option that does not bypass the insulation.
• - Significant reduction in the total assembly time (among other things because of the pre-assembly of the sub-system "guide pillar insulation-antimagnetic and conductive plate").
• - Faster replacement of the electrode support arms possible without having to dismantle or assemble the insulation each time.
• - Because of the improvement in the introduction of force and the flow of force and the extension of the expansion shaft of the bolts, the device according to the invention can also be used for electrode arms of powerful EAFs.

• 1 im oberen Bildbereich eine Seitenansicht einer erfindungsgemäßen Vorrichtung, bei der auf einem Führungssäulenkopf ein Elektrodentragarm befestigt ist, wobei der untere Bildbereich von 1 eine teilweise freigeschnittene Seitenansicht des oberen Bildbereichs zeigt,
• 2-4 jeweilige Perspektivansichten von Teilen der Vorrichtung von 1,
• 5 eine perspektivische Längsschnittansicht einer vormontierten Einheit, die Teil der Vorrichtung von 1 ist,
• 6 eine perspektivische Längsschnittansicht der vormontierten Einheit von 5, wenn auf eine Oberseite von deren Führungssäulenkopf ein Elektrodentragarm aufgesetzt ist,
• 7-8 Bestandteile von zweiteiligen Verschraubungsmitteln, die Teil der Vorrichtung von 1 sind,
• 9 eine Querschnittansicht eines Bereichs der Darstellung von 1,
• 10 eine Perspektivansicht der Darstellung von 9, und
• 11 eine Perspektivansicht eines Bereichs der erfindungsgemäßen Vorrichtung gemäß einer weiteren Ausführungsform.

Preferred embodiments of the invention are described in detail below with reference to a schematically simplified drawing. Show it:

• 1 in the upper image area a side view of a device according to the invention, in which an electrode support arm is fastened on a guide column head, the lower image area of 1 shows a partially cut-away side view of the upper image area,
• 2-4 respective perspective views of parts of the device of 1 ,
• 5 a perspective longitudinal sectional view of a preassembled unit, which is part of the device of 1 is
• 6 a perspective longitudinal sectional view of the preassembled unit of 5 if an electrode support arm is placed on an upper side of the column head thereof,
• 7-8 Components of two-part screwing means that are part of the device of 1 are,
• 9 a cross-sectional view of a portion of the illustration of FIG 1 ,
• 10th a perspective view of the representation of 9 , and
• 11 a perspective view of a portion of the device according to the invention according to a further embodiment.

Possible embodiments of a device according to the invention 10th to hold or position an electrode arm 1 on an associated holding device, and a corresponding method according to the present invention are described below with reference to 1-11 explained in detail. The same features in the drawing are provided with the same reference numerals. At this point, it is pointed out separately that the illustrations in the drawing are merely simplified and in particular are shown without a scale.

The device 10th includes a guide pillar 12 with a column head 13 that together with the guide pillar 12 forms a T-shaped element. The electrode support arm 11 is on or on a top 16 of the column head 16 by screwing means 18th attached.

In the upper part (as a side view) and the lower part (partially cut out) of 1 is the device 10th Shown in its fully assembled state when the screw means mentioned 18th are tightened or preloaded and thereby the electrode support arm 11 in its operating position on the column head 13 is attached. For a easier understanding of the presentation according to 1 are individual parts of the device 10th hereinafter based on the 2-8 explained in detail.

2nd shows the T-shaped element consisting of the guide column 12 with the column head 13 in a perspective view. On a top 16 of the column head 13 are a total of three through holes 14 trained the column head 13 Push through in the vertical direction to the bottom.

On the top 16 of the column head 13 is or will be both insulation 15 as well as a plate-shaped element P , hereinafter simply referred to as the plate. This plate P can be anti-magnetic or have anti-magnetic properties. In addition and / or alternatively, this plate P be conductive. For example, copper fulfills these two properties.

The plate P is PP with its dimensions at the top 16 of the column head 13 customized. In line with the three through holes 14 of the column head 13 are in the plate P also three openings or holes B trained what in the perspective view of 3rd is illustrated.

4th shows in perspective a first connecting bolt 19th who has a head 20th and opposes a lower free end 21st having. An outside diameter of the head 20th is compared to the outer diameter of the shaft of the connecting bolt 19th trained larger. On an upper face of the head 20th an internal thread is formed (not specified).

At the in 1 shown embodiment of the device 10th become the insulation 15 and the plate P using three first connecting bolts 19th (according to 4th ) on the top 16 of the column head 13 fixed by screwing. This screwing is through the perspective longitudinal sectional view of 5 clarified - this is the lower free end 21st a first connecting bolt 19th first through a hole B in the plate P and through a corresponding opening in the insulation 15 inserted and then from above into one in the guide column head 13 trained through hole 14 inserted until the lower free end 21st of the first connecting bolt 19th on the underside of the column head 13 protrudes. Then go to the lower free end 21st of the first connecting bolt 19th a stainless steel disc 29 applied and then a preload nut 26 be screwed on.

The view according to 5 illustrates that in this assembled state the head 20th of the first connecting bolt 19th from the top of the plate P rests with the insulation 15 between this plate P and the top 16 is included or included. If the total of three connecting bolts 19th necessary for the embodiment of 1 are provided, in accordance with 5 illustrated way with the column head 13 are screwed together, this makes a pre-assembled unit E formed from the guide pillar 12 with the column head 13 and the one with the help of the first connecting bolt 19th attached insulation 15 and the plate P consists. Such pre-assembly of the insulation 15 and the plate P on the column head 13 through the first connecting bolt 19th or the majority of such bolts takes place without the inclusion of the electrode support arm 11 , and can therefore be carried out quickly and easily.

For the pre-assembled unit E may be pointed out that a total of three first connecting bolts 19th for screwing the plate P and insulation 15 with the column head 13 be used. The heads protrude when screwed 20th the respective connecting bolts 19th from the plate P upwards.

In a next step the pre-assembled unit explained above E (see. 5 ) in contact with the electrode support arm 11 brought as it by the 6 is illustrated. Here the electrode support arm 11 with its bottom 11U on the plate P put on, which - as explained above - in connection with the insulation 15 at the top 16 of the column head 13 has been previously attached.

In the electrode support arm 11 are a total of three through holes 23 formed in correspondence with the first three connecting bolts 19th with which the plate P in connection with the insulation 15 at the top 16 of the column head 13 is screwed. Within these through holes 23 are pressure sleeves 27 added. Adjacent to the bottom 11U of the electrode support arm have these pressure sleeves 27 an enlarged inner diameter as compared to a central or upper area thereof.

Bringing the electrode arm into contact 11 with or on the plate P that on the column head 13 by means of the connecting bolts 19th is attached in such a way that the pressure sleeves 27 with their enlarged inner diameter exactly on the heads 20th the respective first connecting bolts 19th be set. This is in the representation of 6 for example for one of the first connecting bolts 19th shown. Because the outside diameter of the head 20th of the first connecting bolt 19th is smaller than the inside diameter of one in the electrode support arm 11 recorded assigned pressure sleeve 27 , forms between this head 20th and the pressure sleeve 27 an annular gap 32 .

In the position of 6 is the electrode support arm 11 on the plate P initially only put on without already being screwed on. As a result, it is thanks to the aforementioned ring gap 32 possible, the electrode support arm 11 and the column head 13 to move in a horizontal, ie in an xy-plane relative to each other. In the same way, it is also possible to attach the electrode support arm 11 in this horizontal plane relative to the column head 13 to twist. As a result, the electrode support arm 11 can be moved and brought into the desired operating position precisely and with little effort. Only then will the electrode support arm 11 with the column head 13 screwed, as explained below.

7 shows a perspective view of a second connecting bolt 22 , with a lower free end 24th and an upper free end 25th . at both of these ends 24th , 25th external threads are provided.

8th illustrates the configuration of the two-part screwing means in a perspective view 18th with which the electrode support arm 11 on the column head 13 can be attached. These screw fasteners 18th consist of a first connecting bolt 19th (see. 4th ) and a second connecting bolt (cf. 7 ) and are formed by the second connecting bolt 22 with its lower free end 24th into the internal thread on the front of the head 20th a first connecting bolt 19th is formed, is screwed. In the connected state, the first and second connecting bolts then form 19th , 22 together a stretch shaft 28 , which is advantageous for screwing under high preload.

Starting from the position in which the electrode support arm 11 as shown by 6 on the on the column head 13 attached plate P has been put on, then a reliable fastening or screwing of the electrode support arm 11 with the column head 13 achieved in that the total of three second connecting bolts 22 from above through those in the electrode support arm 11 trained through holes 14 and the pressure sleeves accommodated therein 27 are passed through, so that the lower free ends 24th the second connecting bolt 22 into the internal thread of the head 20th of a respectively assigned first connecting bolt 19th can be screwed in. On the opposite side of the second connecting bolts 22 , ie at their upper free ends 25th , are made using stainless steel washers 29 each preload nuts 26 screwed, with which then a specific preload on the second connecting bolts 19th can be applied to the column head 13 a fixed connection of the electrode support arm 11 to reach in its predetermined operating position. This condition is both in the cross-sectional view of 9 as well as in the cutaway perspective view of 10th illustrated.

Through the views according to the 6 , 9 and 10th is made clear that the inner diameter of a pressure sleeve 27 turned away from the bottom 11U of the electrode support arm 11 , ie in a central and upper area thereof is smaller than adjacent to the underside 11U . In any case, this is the inside diameter of the pressure sleeve 27 chosen in such a way that a second connecting bolt is inserted from above 22 with its lower free end 24th Can be inserted without jamming. Reducing the inner diameter of the pressure sleeve 27 in turn improves the introduction of force and the flow of force, namely both when tightening or pretensioning the respective second connecting bolts 22 as well as under the influence of operating loads

According to a further embodiment of the device 10th can simplify the precise positioning of the electrode support arm 11 on or on the column head 13 Adjustment means J be provided, which is based on the representation of 11 is illustrated and explained

The adjustment means J are in the form of sheets or plates, each with a threaded through hole and on the long sides L the plate P are attached, for example by welding. On each long side L the plate P two such adjustment plates are attached. In the 11 is - for the sake of a simplified representation - only an adjustment plate is shown in the foreground.

Furthermore, are on the bottom 11U of the electrode support arm 11 also such adjustment plates J attached. These sheets J are arranged so that they are on the respective end faces 31 the plate P adjoin.

In all threaded through bores of the six sheets mentioned J are screws 30th introduced, for example in the form of simple hexagon screws, with which a fine adjustment of the electrode support arm 11 relative to the column head 13 can be made. This is done by turning the screws 30th that in the on the long sides of the plate P attached sheets J are screwed in, specifically laterally onto a lower side edge US of the electrode support arm 11 can be pressed, thereby aligning the electrode support arm 11 in the y direction (ie transverse to the longitudinal direction of the electrode support arm 11 ) he follows. In contrast, by turning the screws 30th that in the on the end faces 31 the plate P adjacent sheets J are screwed in, specifically on one or the other end face 31 the plate P pressed, causing an alignment of the electrode support arm 11 in the x direction (ie in or along the longitudinal direction of the electrode support arm 11 ) is reached.

At this point, it is pointed out separately that at the time of a fine adjustment of the position of the electrode support arm 11 relative to the column head 13 by turning the screws 30th the second connecting bolts 22 for attaching the electrode support arm 11 are not yet fully or finally biased. Accordingly, by turning the respective screws 30th quick and easy alignment of the electrode support arm 11 can be achieved in the x and / or y direction. The two directions x and y are also in the representation of 2nd symbolizes.

Considering that both the individual sheets J as well as the screws inserted above the insulation 15 are arranged, the insulation between the electrode support arm 11 and the pillar 12 or the column head attached to it 13 not bridged. This means that the (adjusting) screws remain 30th in the respective threaded through holes of the individual sheets J possible without risk. Alternatively, the screws 30th when completing alignment of the electrode support arm 11 relative to the column head 13 also from the sheets J be removed after the second connecting bolts 19th for "final" fastening of the electrode support arm 11 on the column head 13 have been biased.

Finally, it may be pointed out that a method according to the invention with its steps (i) to (iv), as already explained at the beginning, with the above-mentioned embodiment of the device according to the invention 10th can be carried out. Here, an electrode support arm is attached 11 on a holder in the form of a on a guide column 12 attached column head 13 by a sequence of steps (i) to (iv), namely in this order. In contrast, dismantling or loosening of the electrode arm 11 from the column head 13 can be achieved by a kinematic reversal of steps (iv) and (iii), ie by loosening the second connecting bolts 22 from the heads 20th the respectively assigned first connecting bolts 19th (= kinematic reversal of step iv), and then removing the electrode support arm 11 from the pre-assembled unit E coming from the guide pillar 12 , the column head 13 and the plate attached to it P and insulation 15 exists (= kinematic reversal of step iii).

Reference symbol list

10th

contraption

11

Electrode support arm

11U

Underside (of the electrode support arm 11 )

12

Guide pillar

13

Guide column head

14

Through hole (in the column head 13 )

15

insulation

16

Top (of the column head 13 )

18th

Screw connection means

19th

first connecting bolt

20th

Head (of the first connecting bolt 19th )

21st

lower free end (of the first connecting bolt 19th )

22

second connecting bolt

23

Through hole (in the electrode support arm 11 )

24th

lower free end (of the second connecting bolt 22 )

25th

upper end (of the second connecting bolt 22 )

26

Nut (s), preferably preload nut (s)

27th

Pressure sleeve (for receiving in the through hole 23 )

28

Stretch shaft

29

Stainless steel washers

30th

Adjusting means, in particular screw (s)

31

Face (of the plate P )

32

Annular gap

B

Hole (in the plate P )

E

pre-assembled unit

J

Adjustment means

L

Long side (of the plate P )

P

plate-shaped element or plate

US

lower side edge (of the electrode support arm 11 )

Claims (18)

Device (10) for holding an electrode support arm (11), comprising a guide column (12) with a guide column head (13), an insulation (15) attached to an upper side (16) of the guide column head, and screwing means (18) which the electrode support arm (11) can be fastened to the guide column head (13), the insulation (15) being located between the guide column head (13) and the electrode support arm (11), characterized in that the screwing means (18) are formed in two parts comprising at least a first connecting bolt (19), with which the insulation (15) can be fastened on the upper side (16) of the guide column head, and at least a second connecting bolt (22), which has a vertical through hole (23) formed in the electrode support arm (11) penetrates and can be screwed with its lower end (24) into a head (20) of the first connecting bolt (19). Device (10) after Claim 1 , characterized in that a plate-shaped element (P) is arranged between the insulation (15) and the head (20) of a first connecting bolt, preferably that the plate-shaped element (P) with its dimensions rests on the top (16) of the guide column head ( 13) is adjusted. Device (10) after Claim 2 , characterized in that the plate-shaped element (P) has anti-magnetic properties or is anti-magnetic. Device (10) after Claim 2 or 3rd , characterized in that the plate-shaped element (P) is conductive. Device (10) according to one of the Claims 2 to 4th , characterized in that the plate-shaped element (P) is plated on its surfaces with aluminum or copper, preferably that the plate-shaped element (P) is made of aluminum or copper. Device (10) according to one of the preceding claims, characterized in that the first connecting bolt (19) with a lower free end (21) of which passes through a through hole (14) formed in the guide column head (13) and on the free end (21) a nut is screwed onto the first connecting bolt (19), preferably that this nut is designed as a preload nut (26). Device (10) according to one of the preceding claims, characterized in that the head (20) of the first connecting bolt (19) has an enlarged diameter in comparison to the shank region of the first connecting bolt and is arranged on the upper side (16) of the guide column head (13) . Device (10) according to one of the preceding claims, characterized in that a through hole (23) formed in the electrode support arm (11) is adapted with its inner diameter to the outer diameter of the second connecting bolt (22), such that the second connecting bolt (22) can be inserted into the through hole (23) preferably from above without jamming or jamming. Device (10) after Claim 8 , characterized in that in the through hole (23) of the electrode support arm (11) a pressure sleeve (27) is received, which extends substantially over the length of the through hole (23), wherein an inner diameter of the pressure sleeve (27) to the outer diameter of the second connecting pin (22) is adapted such that the second connecting pin (22) can be inserted without interference and without jamming, preferably from above into the through hole (23). Device (10) after Claim 8 or 9 , characterized in that the through hole (23) or a pressure sleeve (27) accommodated therein has an enlarged inner diameter adjacent to an underside (11U) of the electrode support arm (11) opposite the guide column head (13), said inner diameter having at least one outer diameter of the head (20 ) of a first connecting bolt (19), preferably that the enlarged inner diameter of the through hole (23) or the pressure sleeve (27) adjacent to the underside (11U) of the electrode support arm (11) is larger than the outer diameter of the head (20) of a first Connecting bolt (19). Device (10) according to one of the preceding claims, characterized in that an upper end (25) of the second connecting bolt (22) protrudes from the through hole (23) formed in the electrode support arm (11) and is screwed there with a nut, preferably that this nut is designed as a preload nut (26). Device (10) according to one of the preceding claims, characterized in that the first connecting bolt (19) and the second connecting bolt (22), when these two bolts (19, 22) are connected to one another, have the function of an expansion shaft (28). Device (10) according to one of the Claims 2 to 12 , characterized in that on the longitudinal sides (L) of the plate-shaped element (P) each at least one adjusting device (J) with adjustment means (30) is attached, which can be brought into contact with a lower side edge (US) of the electrode support arm (11). Device (10) according to one of the Claims 2 to 13 , characterized in that on an underside (11U) of the electrode support arm (11) two adjustment devices (J) are fastened with adjusting means (30) which can be brought into contact with the respective end faces (31) of the plate-shaped element (P). A method for holding an electrode support arm (11), comprising the steps: (i) providing a guide column (12) with a guide column head (13), (ii) fastening an insulation (15) to an upper side (16) of the guide column head (13) preferably by means of a first screw connection (19), whereby the guide column (12) and the insulation (15) are connected to one another in a preassembled unit (E) will, (iii) bringing the pre-assembled unit (E) consisting of the guide column (12) and the insulation (15) attached to an upper side (16) of the guide column head (13) into contact with the electrode support arm (11) such that the Electrode support arm (11) is placed on top of the guide column head (13) or the guide column head (13) is brought into contact with an underside (11U) of the electrode support arm (11) from below, and (iv) fastening the electrode support arm (11) to or on the guide column head (13) preferably by means of a second screw connection (22) which is connected to a part (20) of the first screw connection (19). Procedure according to Claim 15 , characterized in that in step (ii) a plate-shaped element (P) is attached to the insulation (15), the plate-shaped element (P) with the first screw connection (19) together with the insulation (15) on the top ( 16) of the column head (13) is fastened, wherein in step (iii) the underside (11U) of the electrode support arm (11) comes into contact with the plate-shaped element (P). Procedure according to Claim 15 or 16 , characterized in that the first screw connection is designed in the form of a first connecting bolt (19) and the second screw connection is designed in the form of a second connecting bolt (22), the second connecting bolt (22) in step (iv) being inserted in the electrode support arm (11) formed through hole (23) penetrates from above and is screwed with its free lower end (24) into a head (20) of the first connecting bolt (19). Procedure according to one of the Claims 15 to 17th which with a device (10) according to one of the Claims 1 to 14 is carried out.

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