WO2017071999A1 - Ladle lifting device and method for vertically moving a ladle containing molten metal - Google Patents

Abstract

The invention relates to a ladle lifting device (22) for a metallurgical plant (2, 58). In order to be able to produce the ladle lifting device (22) cost-effectively, the ladle lifting device (22) includes a lifting arm (34) with a rotatably mounted arm element (36), a first driving element (24) for driving the rotatably mounted arm element (36) of the lifting arm (34), and a first ladle holding unit (42), connected to the lifting arm (34), for gripping a ladle (16) containing molten metal.

Description

description

Ladle lifting device and method for vertically displacing a metal bath pan

The invention relates to a ladle lifting device for a metallurgical plant.

It is known to subject metals in the liquid state to a metallurgical treatment in order to increase their quality. An example of a metallurgical treatment process is the so-called RH process (Ruhrstahl-Heraeus process), in which a molten metal, in particular liquid steel, is subjected to a vacuum treatment in order to decarburize and additionally degas the molten metal.

From the so-called ladle metallurgy, it is known to be treated molten metal in a Metallbadpfanne to gie ^¬ SEN and the Metallbadpfanne on a conveyor to a treatment apparatus, for example, a vacuum treatment vessel of a Ruhrstahl-Heraeus plant to transportation ^¬ animals. As a rule, the metal ^bath pan is positioned under the ^{treatment device} . To bring the Metallbadpfanne in a position where wel ^¬ cher, the molten metal present in the Metallbadpfanne can be treated using the treatment device Metallbadpfanne is usually raised so that is dipped into ^¬ particular an inlet tube of the treatment device in the Metallbadpfanne. After completion of the metal ^¬ Lurgi's treatment of the metal melt, the metal ^¬ badpfanne is then lowered again and transported away by means of the Transportvor ^¬ direction. Subsequently, on the same or another transport device may badpfanne another metal containing a more molten metal to be treated, are transported to the treatment device and the more molten metal be subjected in an analogous manner, a metal ^¬ Lurgi's treatment. To raise and lower a metal bath pan, a pan lift is needed. A ladle lifting device is disclosed, for example, in WO 2012/000218 A1. This pan lifting device comprises a lifting frame on which a metal bath pan can be mounted, as well as meh ^¬ rere lifting cylinder, by means of which the lifting frame can be raised together with the metal bath pan. The lifting frame and the metal bath pan have a high dead weight and therefore require high-performance and consequently cost-intensive lifting cylinders.

An object of the invention is to provide a cost-effective Pfan nenhubvorrichtung for a metallurgical plant.

This object is achieved by a pan lifting device with the features of claim 1. The pan lifting device according to the invention comprises a lifting arm with a rotatably mounted arm member, a first drive ^¬ element for driving the rotatably mounted arm member of the lifting arm and connected to the lifting arm first Pfannenhal - unit for holding a metal bath pan on.

An advantage of this ladle lifting device is that it can be realized with a low weight, in particular because the ladle lifting device does not require a massive lifting frame for lifting the metal bath pan. This allows the use of a less powerful and therefore less expensive drive element than in the prior art.

Furthermore, it is possible to dispense with a separate foundation for the ladle lifting device, so that no costly foundation work is required for the ladle lifting device. The pan lifting device, for example, on an existing scaffold of the metallurgical plant on which, for example, a treatment vessel is stored stored be and / or be mounted on such a scaffold.

Advantageous developments of the pan lifting device according to the invention are each the subject of dependent claims and the following description.

Under a Metallbadpfanne can present a metallurgical ^¬ cal socket for receiving a Metallbadschmelze, also called metal tallbad be understood.

In an advantageous embodiment of the invention the lifting arm has an upper arm link as well as a with the upper arm link ver ^¬ bundenes forearm member. Preferably, the upper arm member and the lower arm member are connected to each other by a hinge, whereby in particular an angle between the upper arm member and the lower arm member is adjustable. The lifting arm is thus preferably a Gelenkhubarm. This enables a compact or space-saving design of the pan lifting device. In addition, good accessibility to other elements of the metallurgical plant, such as a treatment vessel, can be achieved, in particular if the arm members are brought into a corresponding position. Preferably, the upper arm member is rotatably mounted. That is, the upper arm member may be the aforementioned rotatably mounted arm member of the lift arm. Further, it is advantageous ^¬ way, when the forearm member with the first standardized Pfannenhalteein- is connected, in particular by a swivel joint. The lower arm member is expediently connected to the first cup holding unit at one end (that is to say with one of its ends) and connected to the upper arm member at the other end (that is to say with another of its ends). According to a preferred embodiment of the invention the first drive element is a lifting cylinder, in particular a Hyd ^¬ raulik-, pneumatic or electrical lifting. Because a lifting cylinder provides a cost effective means of driving the In addition, the lifting cylinder can be made compact, so that it allows a ^good accessibility to other elements of the metallurgical plant. Devices for controlling the lifting cylinder, for example a pressure medium reservoir and / or a pressure medium pump, can be set up remotely from the lifting cylinder.

The first drive element may include a Zylinderge ^¬ housing. Furthermore, the first drive element may have a push rod. The push rod may be adapted to exert a force or a torque on the rotatably mounted arm member of the lift arm.

Further, it is advantageous if the first drive element is at least substantially aligned vertically. In the present case, an element may be considered to be substantially vertically aligned if it is inclined by at most 10 °, preferably by at most 5 °, with respect to a vertical. In particular, the first drive ^element can be arranged such that its push rod can be extended downwards out of its cylinder housing.

Furthermore, the ladle lifting device expediently has a shaft, in particular a horizontally mounted shaft. Advantageously, the rotatably mounted arm ^¬ limb of the lifting arm is connected to the shaft. In particular, it is advantageous if the rotatably mounted arm member of the lifting arm is rotationally fixedly connected to the shaft. By a rotationally fixed connection can be achieved that a rotational or pivotal movement of the shaft causes the rotatably mounted arm member performs a rotating or pivoting movement at the same angular velocity.

Preferably, the upper arm member of the lift arm is connected at one end to the shaft, in particular connected rotationally fixed, and the other end connected to the lower arm member of the lifting arm. The shaft may for example have a crank pin. About the crank pin, the shaft can be driven by means of the drive ^¬ element. Alternatively or additionally, the rotatably mounted arm member may have an arm extension. Furthermore, the first drive element may be connected to the crank pin or to the arm extension, in particular by a hinge.

In an advantageous development of the invention, the ladle lifting device has a second drive element. Conveniently, the second drive element is arranged for driving the rotatably mounted arm member of the lift arm. Further, the second drive element may be arranged parallel to the first drive ^¬ element. The second drive element may be provided, for example, for redundancy reasons. , The first or the second drive element have a defect, the metal ^¬ badpfanne can be raised using the respective other Antriebsele ^¬ ments, lowered and / or maintained.

The two drive elements can be arranged side by side. Alternatively, the two drive elements may be spaced from each other. For example, a distance may be Zvi ^¬ rule the two drive elements, at least 80% of the length of the shaft. In particular, the two drive elements ^¬ can be placed on or over different ends of the shaft.

The second drive element can be configured identically or Wesentli ^¬ chen identical to the first drive element. Further, any or all of the aforementioned features relating to the first drive element Bezie ^¬ hen can also refer to the second drive element.

Conveniently, the first cup holding unit comprises retaining hooks for hooking to a retaining pin of the metal bath. Moreover, it is advantageous if the first Pfannenhal- teeinheit a lifting beam, in particular a horizontally directed from ^¬ lifting beam comprises. At this Hubtraverse example, the aforementioned holding hooks can be attached. Preferably, the retaining hook is centrally - with respect to the longitudinal ^¬ extension of Hubtraverse - attached to the Hubtraverse. Further, it is advantageous if the Hubtraverse is connected at one of its two ends to the lifting arm, in particular to the lower arm of the lifting arm, for example by a hinge. Alternatively, the lifting arm, in particular the lower arm member of the lifting arm, without a Hubtraverse be connected to the holding ^¬ hook.

In a preferred manner, the pan lifting device is equipped with a further lifting arm. Furthermore, it is preferred if the ladle lifting device has a second pan holding unit. The further lifting arm is expediently connected to the second cup holding unit, in particular by a hinge.

The second cup holding unit may be identical or substantially identical to the first cup holding unit. Further, some or all of the aforementioned features relating to the first cup holding unit may also refer to the second cup holding unit.

Furthermore, the further lift arm can be configured identically or substantially identically to the first-mentioned lift arm. Some or all of the aforementioned features relating to the former lift arm may also apply to the second lift arm.

Furthermore, it is expedient if the further lifting arm has a rotatably mounted arm member. The rotatably mounted arm member of the other lifting arm is preferably through the first to ^¬ drive element and / or by the second drive element at ^¬ drivable. Moreover, it is advantageous if the Pfannenhubvor ^¬ direction has two additional lifting arms. The additional lifting arms expediently each have a rotatable gelager ^¬ tes arm member. Preferably, one of the two additional lift arms with the first cup holding unit is ver ^¬ inhibited, whereas the other of the two lifting arms with a different cup holding unit, in particular with the above-mentioned second he ^¬ cup holding unit is connected.

The load to be lifted by the ladle lifting device can be divided between the individual lifting arms of the ladle lifting device, in particular divided into equal parts.

Moreover, it is advantageous if the pan lifting device has one or more additional drive elements, preferably two additional drive elements. Appropriately ^{¬ way} , the two additional lifting arms by the additional drive element or the additional drive elements can be driven.

The additional lift arms may be identical or substantially identical to the first-mentioned lift arm. Some or all of the aforementioned features relating to the former lift arm may also apply to the additional lift arms.

Furthermore, the additional drive elements may be configured identically or substantially identically to the first drive element. Individual or all of the aforementioned features, which relate to the first drive element, can also be related to the additional drive ^elements .

Furthermore, the invention is directed to a metallurgical plant with the ladle lifting device according to the invention, in particular with an advantageous development of the ladle lifting device according to the invention as described above. The metallurgical plant can, for example, a RH plant (Ruhrstahl-Heraeus plant) to perform the RH process.

Conveniently, the metallurgical plant comprises a scaffold for supporting or supporting a metallurgical treatment vessel. The scaffold may include, inter alia, a plurality of vertically oriented longitudinal beams and a plurality of horizontally oriented transverse beams. Preferably, the pan lifting device is mounted on the scaffold. In this way, it is possible to dispense with a separate foundation for the ladle lifting device and, consequently, cost-intensive foundation work. Preference ^¬ example, the Pfannenhubvorrichtung is attached to the scaffold. In particular, the drive elements of the Pfannenhubvor ^¬ direction can be connected in each case by a rotary joint with a crossbar of the metallurgical plant.

The metallurgical plant may further comprise a metallurgical treatment vessel, in particular a vacuum treatment vessel. In addition, the system may include a vessel change car. The treatment vessel can be mounted on the vessel change car, wherein the vessel change car can in turn be mounted on the support structure.

In addition, the metallurgical plant may comprise a metal ^¬ badpfanne that raise with the Pfannenhubvorrichtung and can be lowered again. Furthermore, the invention relates to a method for vertically displacing a metal bath pan.

In the method according to the invention it is provided that a rotatably mounted arm member of a lift arm of a Pfannenhub- device is driven by means of a drive element of Pfannenhub- device, so that the rotatably mounted arm member performs a pivotal movement, and the metal ^¬ bath pan by the pivoting movement of the rotatably mounted Arm member is displaced vertically by means of a lifting arm connected to the pan holding unit.

The method provides a cost effective way to ver ^¬ tical displacement of a metal bath pan ready.

The elements mentioned in connection with the method can in particular be elements of the above-described ladle lifting device or of the metallurgical system described above.

Vertical displacement of an element, in particular of the metal bath pan, can be understood to mean raising or lowering of this element. Conveniently, in vertical displacement, the direction of movement of the element is parallel to a vertical, i. vertically aligned.

Further, it is expedient if the metal bath pan is held by the cup holding unit, in particular on a Hal ^¬ tezapfen the metal bath pan.

Preferably, to raise the metal bath ^{pan, a} push rod of the drive ^element is extended downwards. Further, it is preferred if it one end connected to the rotatably gela ^¬ siege arm member further arm member of the lifting arm is guided upward. The further arm member of the lifting arm is expediently a lower arm member of the lifting arm.

To lower the Metallbadpfanne the push rod of the drive elements is preferably at ^¬ retracted upward. Further, it is preferred if in this case the further arm member of the lifting arm is guided downwards.

Appropriately, when lifting the metal ^¬ bath pan reduces an angle between the two arm members. When lowering the metal bath pan, the angle zwi ^¬ tively increases the two arm members expediently. The description of advantageous embodiments of the invention given hitherto contains numerous features which are reproduced in some detail in the individual subclaims. However, these features can expediently also be considered individually and combined into meaningful ^further combinations. In particular, these features can be combined individually and in any suitable combination with the device according to the invention and the method according to the invention. Thus, process features, objectively formulated, can also be seen as a property of the corresponding device unit and vice versa.

Even if some of the terms are respectively used in the singular or in conjunction with a numeral in the description and in the claims, the scope of the invention for these terms shall not be restricted to the singular or each ^¬ stays awhile numeral. Further, the words "a" and "an" are not to be understood as number words but as indefinite articles.

The above-described characteristics, features and advantages of the invention, as well as the manner in which they are achieved, will become clearer and more clearly understood in connection with the following description of the exemplary embodiments of the invention, which will be explained in more detail in conjunction with the drawings. The embodiments serve to illustrate the invention and do not limit the invention to the combinations of features specified therein, not even with respect to functional features. In addition, to appropriate features of each embodiment considered in isolation ex ^¬ plicitly from an off exemplary implementation removed in another operation example to from its comple ^¬ wetting introduced and bined with any of claims kom ^¬. Show it:

1 shows a front view of an RH system with a support ^¬ scaffold, a vacuum treatment vessel, a vessel change car, a metal bath pan, a pan car and a Pfannenhubvorrichtung;

2 shows a side view of the RH system of FIG. 1; 3 shows an isometric view of the RH plant, wherein the metal bath pan arranged on the ladle carriage is placed laterally offset from the vacuum treatment vessel; 4 shows an isometric view of the RH plant, wherein the metal bath pan arranged on the ladle carriage is placed under the vacuum treatment vessel;

5 shows an isometric view of the RH system in a raised state of the metal bath pan;

FIG 6 is arranged an isometric view of the RH-installation, wherein the vessel is arranged on the change carriage Vakuumbe ^¬ treatment tube laterally offset from the support structure;

7 shows a perspective view of an alternative

RH plant with a scaffold, a Vakuumbe ^¬ treatment vessel, a vessel change car and a Pfannenhubvorrichtung; and

1 shows a perspective view of the pan lifting device of the alternative RH system from FIG. 7. FIG. 1 shows a front view of a metallurgical system 2. In the case of the metallurgical system 2, this exemplary embodiment is an RH system (Ruhr steel system). Heraeus plant) for decarburizing a molten metal, in particular ^¬ for decarburization of liquid steel.

The metallurgical plant 2 comprises inter alia a support frame 4 with a plurality of vertically oriented longitudinal beams 6 and a plurality of horizontally oriented transverse beams 8, which are connected to the longitudinal beams 6.

In addition, the metallurgical plant 2 comprises a vessel change carriage 10, which is mounted on the support frame 4, in particular on two transverse bars 8 of the support frame 4. Furthermore, the metallurgical plant 2 comprises a vacuum treatment vessel 12, which in turn is mounted on the vessel change carriage 10. During operation of the metallurgical plant 2, the vacuum treatment vessel 12 is connected at its upper end with an intake manifold, not shown figuratively, which in turn is connected to a vacuum pump, not shown figuratively, by means of which a vacuum in the vacuum treatment vessel 12 can be generated. Furthermore, the vacuum treatment vessel 12 has a dip tube unit 14.

Next, the metallurgical plant 2 comprises a metal ^¬ badpfanne 16, and a ladle car 18 for transporting the Metallbadpfanne 16. In FIG 1 is mounted on the ladle car 18 Metallbadpfanne 16 placed under the vacuum treatment vessel ^¬ 12th Furthermore, the metal bath pan 16 has two holding pins 20, of which only one can be seen in FIG. 1 (see FIG. 2). Furthermore, the metallurgical plant 2 is a ladle lifting device 22 which is mounted on the support structure 4 and by means of which the raised Metallbadpfanne 16 and as ^¬ can be lowered. The Pfannenhubvorrichtung 22 includes four drive elements 24, which are each configured in the present embodiment as a lifting cylinder. The drive elements 24 can in particular hydraulic, pneumatic or Elektrohubzylinder be. Compressed air, hydraulic or electrical control lines, via which the drive elements 24 are controllable, are not shown figuratively for the sake of clarity.

In FIG 1 only two of the four drive elements 24 are ^¬ it recognizable, since these two drive elements 24 at the other ^¬ the drive elements 24 collapse (see FIG. 6). Two of the four drive elements 24 are arranged parallel to one another on a first side 26 of the support frame 4. The other two

Drive elements 24 are arranged on one of the first side 26 ^{opposite ¬} second side 28 of the support frame 4 parallel to each other and in mirror symmetry to the first two drive elements 24.

Each of the driving elements comprises a cylinder housing 30 so as ^¬ a push rod 32. Next, the drive elements 24 are substantially vertically aligned and arranged so that their thrust bars 32 sen down from their Zylindergehäu- 30 are extendable.

In addition, the Pfannenhubvorrichtung 22 four lifting arms 34 each having a rotatably mounted upper arm member 36 and each a forearm member 38. In Figure 1, only two of the four lift arms 34 can be seen, since these two lift arms 34, the other two lift arms 34 obscure (see FIG. , Two of the four lift arms 34 are arranged on the first side 26 of the support frame 4. The other two lifting arms 34 are arranged on the two ^¬ th side 28 of the scaffold 4 mirror-symmetrical to the two first-mentioned lifting arms 34.

The upper arm member 36 of the respective lifting arm 34 is connected by a swivel joint 40 to the lower arm member 38 of the respective lifting arm 34, so that an angle between the two Armlegie- countries 36, 38 is adjustable.

Furthermore, the ladle lifting device 22 comprises two pan holding units 42, each having a lifting crossbar 44 and a In FIG. 1, only one of the cup holding units 42 can be seen (see FIG. 2). In addition, the retaining hooks 46 are hooked in the state shown in FIG 1 to the retaining pin 20 of the metal bath pan 16.

In addition, the Pfannenhubvorrichtung 22 includes two horizontally aligned shafts 48 which are each mounted on a unte ^¬ ren transom of the scaffold 4 (see FIG. 2). Both shafts 48 each have two crank pin 50 in the middle. One of the two shafts 48 is arranged on the first side 26 of the support frame 4, while the other of the two Wel ^¬ len 48 is arranged on the second side 28 of the support frame 4.

The two on the first side 26 of the scaffold 4 angeord ^¬ Neten lift arms 34 are rotatably connected with their respective upper arm member 36 fixed to that shaft 48 which is arranged on the first side 26 of the support frame 4. Entspre ^¬ accordingly the two are on the second side 28 of the Stützge ^¬ rüsts 4 arranged lifting arms 34 connected to its respective upper arm member 36 rotationally fixed to that shaft 48, which is disposed on the second side 28 of the scaffold. 4 Here, the upper arm members 36 are each attached to one end of the corresponding shaft 48.

Furthermore, each of the drive elements 24 at one end (and at its upper end) are each connected by a pivot 52 with an upper crossbar 8 of the support frame 4. Arrival dernends (ie, at its lower end) of each of the drive ^¬ selemente 24 is connected by a pivot joint 54 to a crank pin 50, so that the driving elements 24 each ^¬ weils about 4 angeord ^¬ designated on the same side of the scaffold shaft 48, the can drive with the shaft 48 connected lifting arms 34. Furthermore, the driving elements 24 each ^¬ weils disposed outside of the support frame 4, so that a good is given to ^¬ accessibility to the vacuum treatment vessel 12, which in turn allows a quick and / or low-cost replacement of the vacuum treatment vessel 12.

Furthermore, the two Hubtraversen 44 are each provided with a IH rer both ends ver ^¬ connected with the lower arm links 38 of which is arranged on the first side 26 of the scaffold lift arms 4 34th Further, the two Hubtraversen 44 are each connected to the other of its two ends with the lower arm members 38 of arranged on the second side 28 of the support frame 4 lifting arms 34. The Hubtraversen 44 are each connected by a rotary joint 56 with the respective lower arm member 38.

2 shows a side view of the metallurgical plant 2, wherein the metallurgical plant Darge ^¬ is in the same state as 2 in Fig. 1

In FIG. 2, one of the two previously mentioned shafts 48, both pan holder units 42 of the ladle lifting device 22 and both holding pins 20 of the metal bath pan 16 can be seen (in addition to some of the previously described elements). In addition, two of the four drive elements 24 are shown in FIG 2, which are arranged side by side on the same side of the scaffold 4 ^¬ .

With reference to FIGS. 3 to 5, it is explained below how the metal bath pan 16 is lifted by means of the ladle lifting device 22. 3 shows an isometric view of the metallurgical plant 2 in a state in which the pan car 18 and the metal bath pan 16 arranged on the pan car 18 are arranged laterally offset relative to the supporting structure 4. In this state, the push rods 32 of the drive elements 24 are retracted as far as possible into the cylinder housing 30 of the respec ^¬ gen drive element 24, wherein the Hubtra ^¬ verses 44 are each in their lowest position. Is to be a metallurgical treatment of molten metal contained in the metal ^¬ badpfanne 16 Metallbadpfanne 16 is first un ^¬ ter using the ladle car 18 down the vacuum treatment vessel 12th Subsequently, the retaining hooks 46 are hooked to the retaining pin 20 of the metal bath pan 16 (see FIG.

4 shows an isometric view of the metallurgical plant 2 in a state in which the pan car 18 and arranged on the pan car 18 metal bath pan 16 are located under the vacuum treatment vessel 12 and are hooked at ^¬ the retaining hook 46 to the retaining pin 20 of the metal bath pan 16 , Here, the push rods are at the drive elements ^¬ extended 32 24 a short distance from the cylinder housing 30 of the respective drive element 24 and the two Hubtraversen 44 are in a slightly higher position than in Fig. 3

From this state, the Metallbadpfanne 22 is raised until the dip tube unit 14 of the vacuum treatment vessel is immersed 12 in the present in the Metallbadpfanne 16 molten metal, so ^¬ that by using the vacuum treatment vessel 12 a METALLUR ^¬ gic treatment of the molten metal may be performed 16 using the Pfannenhubvorrichtung (see FIG 5).

The lifting arms 34 of the pan lifting device 22 are driven by means of the drive elements 24. For lifting the Metallbadpfanne 16, the push rods 32 of all four drive elements 24 synchronously and extended with equal amplitude out by un ^¬ th from the respective cylinder housing 30th Here, each of the drive elements 24 exerts on the ver ^¬-bound with him crank pin 50 of a torque on the respective shaft 48, which is thereby set in a rotational movement. This in turn causes each of which executes a rotation / pivoting movement to the shafts 48 Rotati ^¬ onsfest connected upper arm links 36 of the lifting arms 34th By the turn /

Pivoting movement of the upper arm members 36 will cause the forearm members 38 and connected to the lower arm members 38 Hubtraversen 44 led upwards. In this way the Metallbadpfanne 16 is raised by means of the buildin ^¬ saturated Hubtraversen to the holding hook 44 46th

FIG 5 shows an isometric view of the metallurgical plant 2 in a state in which the Metallbadpfanne 16 is raised so far that the dip tube unit 14 of the vacuum ^¬ treatment vessel immersed in the sawn-sensitive in the molten metal 16 Metallbadpfanne 12th

In order to lower the metal bath pan 16 again, the push rods 32 of all four drive elements 24 are moved synchronously and with the same amplitude upwards into the respective cylinder housing 30. This results in that the rotationally fixed to the Wel ^¬ len 48 upper arm links 36 of the lifting arms 34 run now a rotation / pivoting movement in the opposite direction. By this rotational / pivotal movement of the upper arm members 36, the lower arm members 38 and connected to the lower arm members 38 Hubtraversen 44 are guided downward. In this way, the metal bath pan 16 is lowered by means of the retaining bars 46 fastened to the lifting crosspieces 44.

The metal bath pan 16 is lowered, for example, when the metallurgical treatment of the molten metal is completed and / or when replacement of the vacuum treatment vessel 12 is intended. Is an exchange of the vacuum treatment vessel 12 beabsich ^¬ Untitled, for example because a lining of the vacuum treatment vessel to be replaced 12, the Hubtraversen 44 of the ladle nenhubvorrichtung 22 placed in its lowest position, respectively, so that the vacuum treatment vessel 12 by using the overall fäßwechselwagens 10 from the scaffold 4 can be moved away (see FIG 6). 6 shows an isometric view of the metallurgical plant 2 in a state in which the vessel changing carriage 10 and the bearing on the vessel changing carriage 10 Vakuumbe ^¬ treatment vessel 12 laterally offset are placed to the supporting structure 4 and the Hubtraversen 44 of Pfannenhub- device 22 each in their lowest position.

In addition, in FIG. 6, the metal bath pan 16 is arranged on the ladle carriage 18, which is placed laterally offset relative to the support frame 4.

The description of the following embodiment ^¬ be limited primarily on the differences from the foregoing, in connection with FIG 1 to 6 discussed Ausführungsbei ^¬ play, to remain the same features and functions, reference is made. Essentially identical or mutually corresponding elements are, as far as appropriate, designated by the same reference numerals and features not mentioned are taken over in the following embodiment, without being described again.

7 shows a perspective view of an alternatively ^¬ ven metallurgical plant 58. Also, in the metallurgical installation 58 of the present embodiment is an RH system of decarburizing molten metal, particularly to the decarburization of molten steel.

This metallurgical plant 58 likewise comprises a wagon and a metal bath ladle. However, these are 7 a better clarity, not abgebil ^¬ det in FIG.

In contrast to the metallurgical plant 2 from the preceding embodiment, in the metallurgical plant 58 of the present exemplary embodiment, the upper arm members 36 of the lifting arms 34 each have an arm extension 60 on. For missing in the Pfannenhubvorrichtung 22 of the present metallurgical plant 58, the crank pin 50th

Furthermore, each of the drive elements 24 is connected at its lower end in each case via a pivot 62 with one of the arm extensions 60. In the present exemplary embodiment, when lifting or lowering the metal ^bath pan, each of the drive elements 24 directly exerts a torque on the arm link 36 connected to it.

Furthermore, the in each case arranged on the same side of the metal rule ^¬ Lurgi system 58 drive elements 24 vonei ^¬ Nander spaced, with their distance from one another is approximately 90% of the length of the respective shaft 48th

8 shows the isolated Pfannenhubvorrichtung 22 of the metal ^¬ lurgi rule system 58 of FIG 7 in a perspective view. In FIG. 8, the arm extension 60 of the respective upper arm member 36 can be better recognized.

Although the invention has been further illustrated and described in detail by the preferred embodiments, the invention is not limited by the disclosed examples and other variations can be derived therefrom without departing from the scope of the invention.

LIST OF REFERENCE NUMBERS

2 plant

 4 scaffold

 6 longitudinal beams

 8 crossbeams

 10 vessel exchangers

12 vacuum treatment vessel

14 dip tube unit

16 metal bath pan

 18 pan wagon

 20 retaining pins

 22 ladle lifting device

24 drive element

 26 page

 28 page

 30 cylinder housing

 32 push rod

 34 lift arm

 36 upper arm limb

 38 forearm limb

 40 swivel joint

 42 pan holding unit

44 lifting beam

 46 holding hooks

 48 wave

 50 crankpins

 52 swivel joint

 54 swivel joint

 56 swivel joint

 58 attachment

 60 Arm process

 62 swivel joint

Claims

claims 1. Pfannenhubvorrichtung (22) for a metallurgical plant (2, 58), comprising a lifting arm (34) with a rotatably mounted arm arm member (36), a first drive element (24) for driving on the ^¬ rotatably mounted arm member (36) the lifting arm (34) and a first pan holding unit (42) connected to the lifting arm (34) for holding a metal bath pan (16). 2. Pfannenhubvorrichtung (22) according to claim 1, characterized in that the lifting arm (34) has an upper arm member (36) as well as a by a pivot (40) to the upper arm member (36) connected to the lower arm member (38), said top ^¬ arm member (36) is rotatably mounted and the lower arm link ( 38) is connected to the first cup holding unit (42) by a pivot (56). 3. Pfannenhubvorrichtung (22) according to claim 1 or 2, characterized in that the first drive element (24) is a lifting cylinder, in particular a hydraulic, pneumatic or Elektrohubzylinder, and a cylinder housing (30) and a push rod (32), wherein the first Antriebsele ^¬ ment (24) is at least substantially aligned vertically and is arranged such that its push rod (32) downwardly from its cylinder housing (30) is extendable. 4. Pfannenhubvorrichtung (22) according to any one of the preceding claims, characterized by a horizontally mounted shaft (48), with which the rotatably mounted arm member (36) of the lifting arm (34) is rotatably connected. 5. Pfannenhubvorrichtung (22) according to claim 4, characterized in that the shaft (48) has a crank pin (50) to which the first drive member (24) is connected by a pivot (54), or in that the rotatably mounted arm member (36) has an arm extension (60) . with which the first drive element (24) by a Drehge ^¬ steering (62) is connected. 6. Pfannenhubvorrichtung (22) according to any one of the preceding claims, characterized by a second drive member (24) for at ^¬ drive of the rotatably mounted arm member (36) of the lifting arm (34), said second drive member (24) is arranged parallel to ers ^¬ th driving element (24). 7. Pfannenhubvorrichtung (22) according to any one of the preceding claims, characterized in that the first cup holding unit (42) comprises a retaining hook (46) for hooking to a retaining pin (20) of the metal bath pan (16). 8. Pfannenhubvorrichtung (22) according to claim 7, characterized in that the first cup holding unit (42) comprises a Hubtraverse (44) to which the retaining hook (46) is attached and which is connected at one of its two ends by a pivot (56) with the lifting arm (34). 9. Pfannenhubvorrichtung (22) according to any one of the preceding claims, characterized by a second cup holding unit (42) and a further lifting arm (34) which is connected by a pivot (56) to the second cup holding unit (42) and has a rotatably mounted arm member (36) which is guided by the first drive element (24) is drivable. 10. Pfannenhubvorrichtung (22) according to any one of the preceding claims, characterized by two additional drive elements (24) and two additional lift arms (34), each having a rotatably mounted arm member (36) which is drivable by the two additional drive elements (24), wherein ei ^¬ ner of the two additional lift arms (34) is connected to the first pan holding unit (42) and the other of the two Lifting arms (34) with another cup holding unit (42) ver ^¬ is connected. 11. Metallurgical plant (2, 58) with a Pfannenhubvor- direction (22) according to one of the preceding claims and a support frame (4) for supporting a metallurgical treatment vessel (12), wherein the Pfannenhubvorrichtung (22) mounted on the support frame (4) is. 12. Metallurgical plant (2, 58) according to claim 11, characterized by a metallurgical treatment vessel (12), in particular a vacuum treatment vessel, and a Ge ^¬ fäßwechselwagen (10) on which the treatment vessel (12) Gela ^¬ siege, wherein the vessel change car (10) in turn on the support frame (4) is mounted. 13. A method of vertically displacing a metal bath pan (16) in which a rotatably mounted arm member of a lift arm (34) of a pan lift device (22) is driven by a drive element (24) of the pan lift device (22) such that the pivotally mounted arm member (36) performs a pivoting movement, and the metal bath pan (16) by the pivotal movement of the rotatably mounted arm member (36) by means of a with the lifting arm (34) connected Pfannenhal- teeinheit (42) is vertically offset. 14. The method according to claim 13, characterized in that for lifting the metal bath pan (16) a push rod (32) of the drive element (24) is extended downward and thereby connected to the rotatably mounted arm member (36) further arm member (38) of the lifting arm (34) is guided above. 15. The method according to claim 13 or 14, characterized in that for lowering the metal bath pan (16) a push rod (32) of the drive element (24) is retracted upwards and thereby one with the rotatably mounted ten arm member (36) connected further arm member (38) of the lifting arm (34) is guided downwards.