RU2719998C2 - Bucket lifting device and method of liquid metal bath bucket vertical movement - Google Patents

Abstract

FIELD: metallurgy.SUBSTANCE: bucket lifting device (22) comprises lifting lever (34) and first bucket gripping unit (42) connected therewith. First drive element (24) drives element (36) of lifting lever (34) installed with possibility of rotation.EFFECT: reduced weight of bucket lifting device, which enables to use cost-effective drive elements and to abandon separate foundation for bucket lifting device.15 cl, 8 dwg

Description

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

It is known to subject metals in a liquid state to metallurgical processing in order to improve their quality. An example of a metallurgical processing method is the so-called RH method (Ruhstahl-Heraeus — a circulating vacuum method) in which a metal melt, in particular liquid steel, is evacuated so that the metal melt is decarburized and further degassed.

From the so-called ladle metallurgy, it is known to pour the molten metal to be processed into a ladle of a bath of liquid metal and to ladle a bath of molten metal on a transport device to a processing device, for example, to a vacuum vessel of a circulating vacuum installation. Typically, a liquid metal bath bucket is positioned under the processing device.

In order for the molten metal bathtub ladle to be brought into a position in which the molten metal in the molten metal bathtub can be processed by the processing device, the molten metal bathtub ladle is generally raised, so that in particular the inlet pipe of the processing device is immersed in the molten bathtub . After the metallurgical processing of the molten metal is completed, the liquid metal bath ladle is then lowered again and retracted by the transport device. Thereafter, on the same or on a different transport device, another molten metal bathtub ladle that contains further processed metal melt can be led to the processing device, and further metal melt can be similarly subjected to metallurgical processing.

In order to be able to raise and lower the liquid metal bath bucket, a bucket lift device is required.

A bucket lifting device is disclosed, for example, in WO 2012/000218 A1. This ladle lifting device includes a lifting frame on which a molten bath tub bucket can be mounted, as well as several lifting cylinders with which the lifting frame can be lifted together with the molten bath tub. The lifting frame, as well as the ladle of the molten metal bathtub, have a high dead weight and therefore require high-power and therefore expensive lifting cylinders.

The objective of the invention to provide an economical device for lifting a bucket for a metallurgical installation.

This problem is solved according to the invention using a bucket lifting device with the features of paragraph 1 of the claims.

The bucket lifting device according to the invention has a lifting arm with a rotatable lever element, a first drive element for driving a rotatable lifting lever element, and a first bucket gripping unit connected to the lifting arm for gripping a molten bath tub bucket.

An advantage of this bucket lifting device is that it can be implemented with a low dead weight, in particular since the bucket lifting device does not require a heavy lifting frame to lift the liquid metal bath bucket. This makes it possible to use a less powerful and thus more economical drive element than in the prior art.

In addition, it is possible to abandon a separate foundation for the bucket lifting device, so that expensive work to create the foundation is not required for the bucket lifting device. The bucket lifting device can be mounted, for example, on an existing support frame of a metallurgical installation on which, for example, a processing vessel is mounted, and / or fixed on such a support frame.

Preferred improvements of the bucket lifting device according to the invention are in each case the subject of the dependent claims, as well as the following description.

Under the ladle bath liquid metal can in this case be understood as a metallurgical ladle for receiving molten metal, also called a liquid metal bath.

In a preferred embodiment, the lifting arm has an upper arm member as well as a lower arm member coupled to the upper arm member. Preferably, the upper arm member and the lower arm member are connected to each other by a pivot joint, whereby in particular the angle between the upper arm member and the lower arm member may vary. The lifting arm is thus preferably a articulated lifting arm. This makes it possible to compact or take up little space bucket lift device. In addition, as a result of this, good access to other elements of the metallurgical plant can be achieved, such as, for example, to the processing vessel, in particular if the lever elements are brought into the appropriate position.

Preferably, the upper arm member is pivotally mounted. That is, the upper arm member may be a previously specified, pivotally mounted arm member. It is further preferred that the lower arm member is connected to the first bucket gripper, in particular a pivot joint. Advantageously, the lower arm member is connected at one end (i.e., one of its ends) to the first bucket gripping unit, and from the other end (i.e., the other from its ends) to the upper arm member.

According to a preferred embodiment of the invention, the first drive element is a lifting cylinder, in particular a hydraulic, pneumatic or electric lifting cylinder. Since the lifting cylinder is an economical means for driving the rotationally mounted lifting lever element. In addition, the lifting cylinder can be compact, so that it makes possible good access to other elements of the metallurgical installation. Control devices for the lifting cylinder, such as a reservoir with a working medium and / or a pump of a working medium, can be located at a distance from the lifting cylinder.

The first drive element may in particular have a cylinder body. Further, the first drive element may have a push rod. The push rod may be adapted to exert force or torque on the pivotally mounted lifting arm member.

It is further preferred that the first drive element is oriented at least in a substantially vertical direction. In this case, the element can then be perceived to be essentially vertically oriented if it is inclined by a maximum of 10 °, preferably a maximum of 5 °, relative to the vertical. In particular, the first drive element may be positioned so that its push rod can extend downward from its cylinder body.

Further, the bucket lifting device expediently has a shaft, in particular a horizontal shaft. Preferably, the pivotally mounted lifting arm member is connected to the shaft. In particular, it is preferable if the pivotally mounted element of the lifting arm is rotatably connected to the shaft. Due to the connection without the possibility of rotation, it can be achieved that the rotational or rotary movement of the shaft leads to the fact that the pivotally mounted lever element rotates or rotates at the same angular velocity.

Preferably, the upper element of the lifting arm is connected at one end to the shaft, in particular rotationally connected, and at the other end to the lower element of the lifting arm.

The shaft may have, for example, a connecting rod pin. Through the connecting rod pin, the shaft can be driven by the drive element. Alternatively or additionally pivotally mounted, the lever element may have a protrusion of the lever. In addition, the first drive element can be connected with a connecting rod pin or with a protrusion of the lever, in particular a swivel joint.

In a preferred development of the invention, the bucket lift device has a second drive element. Advantageously, the second drive element is adapted to drive a rotatable lifting arm element. Further, the second drive element may be located parallel to the first drive element. A second drive element may be provided, for example, for backup reasons. If the first or second drive element has a malfunction, then the molten metal bath bucket may be raised, lowered and / or held using a different drive element in each case.

Both drive elements can be located next to each other. Alternatively, both drive elements may be spaced apart. For example, the distance between the two drive elements may be at least 80% of the shaft length. In particular, both drive elements can be placed on or above different ends of the shaft.

The second drive element may be identical or substantially identical to the first drive element. In addition, some or all of the above features that relate to the first drive element may equally apply to the second drive element.

Advantageously, the first bucket gripping unit includes a gripping hook for engaging with a gripping spike of the molten bath tub bucket.

On top of this, it is preferable if the first bucket gripping unit includes a lifting beam, in particular a horizontally oriented lifting beam. For example, the aforementioned gripping hook can be fixed to this lifting beam. Preferably, the gripping hook is fixed in the middle — with respect to the longitudinal extension of the lifting beam — to the longitudinal beam. It is further advisable if the lifting beam at one of its both ends is connected to the lifting lever, in particular to the lower element of the lifting lever, for example, a swivel joint. Alternatively, the lifting arm, in particular the lower element of the lifting arm, can be connected to the gripping hook without the lifting beam.

Preferably, the bucket lifting device is equipped with a further lifting arm. It is further preferred that the bucket lifting device has a second bucket gripping unit. A further lifting lever is expediently connected to the second bucket gripper, in particular a pivot joint.

The second bucket gripping unit may be identical or substantially identical to the first bucket gripping unit. In addition, some or all of the above features that relate to the first bucket gripping unit may equally apply to the second bucket gripping unit.

Further, the further lifting arm may be identical or substantially identical to the first lifting arm. Some or all of the above features that relate to the first lifting arm may equally apply to the second lifting arm.

It is further advisable if the further lifting arm has a pivotable arm member. The pivoting member of the further lifting arm can be preferably driven by a first drive element and / or a second drive element.

On top of this, it is preferable if the bucket lifting device has two additional lifting arms. In each case, additional lifting levers expediently have a lever element mounted with a possibility of rotation. Preferably, one of the two additional lifting arms is connected to the first bucket gripping unit, while the other of both lifting arms is connected to the other bucket gripping unit, in particular to the above second bucket gripping unit.

The mass lifted by the bucket lifting device can be distributed to the individual lifting arms of the bucket lifting device, in particular distributed in equal proportions.

In addition, it is preferable if the bucket lifting device has one or more additional drive elements, preferably two additional drive elements. It is advisable that both additional lifting arms can be driven by an additional drive element or additional drive elements.

Additional lifting arms may be identical or substantially identical to said first lifting arm. Some or all of the above features that relate to the first lifting arm may equally apply to the additional lifting arms.

In addition, additional drive elements may be identical or substantially identical to the first drive element. Some or all of the above features that relate to the first drive element may equally apply to additional drive elements.

The invention further relates to a metallurgical plant including a ladle lifting device according to the invention, in particular with a preferred refinement of a ladle lifting device according to the invention according to the above description. The metallurgical plant may be, for example, an RH plant (circulating evacuation) for performing the RH process.

Suitable metallurgical installation includes a support frame for supporting or supporting the vessel metallurgical processing. The support frame may include in particular several oriented vertically longitudinal beams and several oriented horizontally transverse beams.

Preferably, the bucket lifting device is mounted on a support frame. Thus, it is possible to abandon the separate foundation for the device for lifting the bucket and, therefore, also from the expensive work to create the foundation. Preferably, the bucket lifting device is mounted on a support frame. In particular, the drive elements of the bucket lifting device can in each case be connected by a swivel joint to the transverse beam of the metallurgical installation.

The metallurgical plant may further include a metallurgical processing vessel, in particular a vacuum vessel. In addition, the installation may include a vessel change trolley. A processing vessel may be mounted on the vessel changing trolley, and the vessel changing trolley may be mounted on its side on the support frame.

In addition, the metallurgical plant may include a molten metal bathtub ladle, which can be raised and lowered using a ladle lift device.

The invention further relates to a method for vertically moving a ladle of a bath of molten metal.

In the method according to the invention, it is provided that the rotationally mounted lifting element of the bucket lifting device is driven by the drive element of the lifting device of the bucket, so that the rotating mounted lever element rotates, and the molten metal bath bucket due to the rotational movement of the rotatably mounted the lever element is moved vertically by a bucket gripper unit connected to the lifting lever.

The method provides an economical possibility of vertical movement of the ladle baths of molten metal.

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

The vertical movement of an element, in particular a ladle of a bath of molten metal, can be understood as raising or lowering this element. It is advisable when moving vertically, the direction of movement of the element is oriented parallel to the vertical, that is, vertically.

It is further advantageous if the liquid metal bath bucket is captured by the ladle gripper, in particular by the gripping spike of the liquid metal bath ladle.

Preferably, to raise the liquid metal bath ladle, the push rod of the drive member extends downward. Further, it is preferable if in this case the further element of the lifting arm connected to the pivotally mounted element of the lever is moved up. Speaking about the further element of the lifting arm, it is advisable to talk about the lower element of the lifting arm.

To lower the liquid metal bath ladle, the push rod of the drive element is preferably pulled upward. It is further preferred that the further element of the lifting arm moves downward.

It is advisable when lifting the ladle baths of molten metal, the angle between both elements of the lever decreases. When lowering the bucket of the bath of liquid metal, the angle between both elements of the lever expediently increases.

The above description of preferred embodiments of the invention contains numerous features that are shown in separate dependent claims, being partially combined into several features. However, these features can also be considered individually and combined into rational further combinations. In particular, these features may, in each case, individually and in any suitable combination, be combined with the device of the invention and the method of the invention. So the features of the method, objectively formulated, can also be considered as a property of the corresponding node of the device and vice versa.

Despite the fact that in the description or in the claims, some concepts are used in each case in the singular or in combination with a numeral, the scope of the invention for these concepts should not be limited to a single number or corresponding numeral. In addition, the words “ein” or “eine” should not be understood as numerals, but as indefinite articles.

The above-described properties, features and advantages of the invention, as well as the way to achieve them, become more clearly and clearly understood in connection with the following description of embodiments of the invention, which are explained in more detail in connection with the drawing. The embodiments serve to explain the invention and do not limit the invention to combinations of features defined therein, even with respect to functional features. In addition, the suitable features of each embodiment can also be considered explicitly isolated, separated from the embodiment, included in another embodiment to limit it, and combined with any of the claims.

The drawings show:

FIG. 1 is a front view of an RH installation with a support frame, an evacuation vessel, a vessel change cart, a molten bath tub ladle, a ladle cart and a ladle lift device;

FIG. 2 is a side view of the RH apparatus of FIG. 1;

FIG. 3 is a perspective view of an RH installation, the liquid metal bath bucket located on the bucket carriage being placed laterally displaced from the evacuation vessel;

FIG. 4 is a perspective view of an RH installation, the liquid metal bath bucket located on a bucket trolley placed under a vacuum vessel;

FIG. 5 is a perspective view of an RH installation in a raised state of a molten bath tub ladle;

FIG. 6 is a perspective view of an RH installation, wherein the evacuation vessel located on the vessel changing trolley is disposed laterally relative to the support frame;

FIG. 7 is a perspective view of an alternative RH installation with a support frame, a vacuum vessel, a vessel change trolley, and a bucket lifting device; and

FIG. 8 is a perspective view of the bucket elevator of the alternative RH installation of FIG. 7.

FIG. 1 shows a front view of a metallurgical plant 2. Speaking of a metallurgical plant 2, in this embodiment we are talking about an RH installation (circulating vacuum evacuation unit) for decarburization of a molten metal, in particular for decarburization of molten steel.

The metallurgical installation 2 includes in particular a support frame 4 with several vertically oriented longitudinal beams 6 and several horizontally oriented transverse beams 8, which are connected to the longitudinal beams 6.

In addition, the metallurgical installation 2 includes a vessel 10 changing the vessel, which is installed on the supporting frame 4, in particular on two transverse beams 8 of the supporting frame 4. Next, the metallurgical installation 2 includes a vessel 12 evacuation, which in turn is mounted on the trolley 10 vessel changes. During operation of the metallurgical plant 2, the evacuation vessel 12 is connected at its upper end to a suction elbow (not shown), which in turn is connected to a vacuum pump not shown, by which a vacuum can be created in the evacuation vessel 12. Further, the evacuation vessel 12 has a tubular immersion unit 14.

Further, the metallurgical plant 2 includes a liquid metal bath bucket 16, as well as a bucket trolley 18 for moving the liquid metal bath ladle 16. In FIG. 1 a ladle 16 of a molten metal bath mounted on a trolley 18 is located under a vacuum vessel 12. Further, the liquid metal bath ladle 16 has two gripping spikes 20, of which in FIG. 1, only one can be seen (cf. FIG. 2).

Further, the metallurgical installation 2 has a ladle lifting device 22, which is mounted on the support frame 4, and by means of which the molten metal bath ladle 16 can be raised and lowered again.

The bucket lifting device 22 includes four drive elements 24, which in this embodiment are in each case a lifting cylinder. The drive elements 24 may in particular be hydraulic, pneumatic or electric lifting cylinders. Pneumatic, hydraulic or electrical control lines through which the drive elements 24 can be controlled are not shown in the drawing for the sake of clarity.

In FIG. 1, only two of the four drive elements 24 can be seen, since these two drive elements 24 overlap the other two drive elements 24 (cf. FIG. 6). Two of the four drive elements 24 are located parallel to each other on the first side 26 of the support frame 4. Both other drive elements 24 are located on the opposite first side 26 of the second side 28 of the support frame 4 parallel to each other, as well as mirror-symmetrical with respect to both of the first drive elements 24.

Each of the drive elements includes a cylinder body 30 as well as a push rod 32. Further, the drive elements 24 are oriented substantially vertically and are arranged so that their push rods 32 can extend downward from their cylinder bodies 30.

In addition, the bucket lifting device 22 includes four lifting arms 34 in each case with a pivotable upper arm member 36, as well as in each case with a lower arm member 38. In FIG. 1, only two of the four lifting arms 34 can be seen, since these two lifting arms 34 overlap the other two lifting arms 34 (cf. FIG. 2). Two of the four lifting arms 34 are located on the first side 26 of the support frame 4. Both of the other lifting arms 34 are located on the second side 28 of the support frame 4 in a mirror-symmetrical manner with respect to both first lifting arms 34.

The upper element 36 of the corresponding lifting arm 34 is connected by a pivot joint 40 to the lower element 38 of the corresponding lifting arm 34, so that the angle between the two arm elements 36, 38 can vary.

Further, the bucket lifting device 22 includes two bucket gripping units 42 in each case with a lifting beam 44 and a gripping hook 46 fixed to the lifting beam 44. In FIG. 1, only one bucket gripping unit 42 can be seen (cf. FIG. 2). In addition, the gripping hooks 46 in FIG. 1 state are hooked onto the gripping spikes 20 of the ladle 16 of the molten metal bath.

On top of this, the bucket lifting device 22 includes two horizontally oriented shafts 48, which in each case are mounted on the lower transverse beam of the support frame 4 (cf. FIG. 2). Both shafts 48 have in each case two connecting rods 50 in the middle. One of both shafts 48 is located on the first side 26 of the support frame 4, while the other of both shafts 48 is located on the second side 28 of the support frame 4.

The two lifting arms 34 located on the first side 26 of the supporting frame 4 of the lifting arm 34 are connected with their respective upper arm element 36 without rotation with the shaft 48, which is located on the first side 26 of the supporting frame 4. Accordingly, the two lifting arms 34 located on the second side 28 of the supporting frame 4 connected with their respective upper lever element 36 without rotation with the shaft 48, which is located on the second side 28 of the support frame 4. The upper 36 elements of the levers are fixed in each case at the end respectively stvuyuschego shaft 48.

Further, each of the drive elements 24 is connected at one end (namely, at its upper end) in each case with a pivot hinge 52 to the upper transverse beam 8 of the support frame 4. At the other end (i.e., at its lower end), each of the drive elements 24 is connected in each case, by a pivoting joint 54 with one of the connecting rod pins 50, so that the drive elements 24 in each case can be lifted by the lifting arms 34 connected to the shaft 48 on the same side of the support frame 4. Further, the drive elements 24 are located in in each case, on the outside of the support frame 4, so that there is good accessibility to the evacuation vessel 12, as a result of which, in turn, conditions are created for a quick and / or labor-intensive change of the evacuation vessel 12.

Further, both lifting traverses 44 are connected in each case with one of their both ends with the lower elements 38 located on the first side 26 of the support frame 4 of the lifting arms 34. Further, both lifting traverses 44 are connected in each case with the other of their both ends with the lower elements 38 located on the second side 28 of the support frame 4 of the lifting arms 34. The lifting arms 44 are each connected in this case with a pivoting joint 56 to the corresponding lower arm member 38.

FIG. 2 shows a side view of a metallurgical plant 2, wherein the metallurgical plant 2 is depicted in the same state as in FIG. 1.

In FIG. 2, you can see (along with some of the previously described elements) one of both of the above shafts 48, both bucket gripping units 42 of the bucket lifting device 22, as well as both gripping spikes 20 of the molten metal bath bucket 16. In addition, in FIG. 2 shows two of the four drive elements 24, which are located next to each other on one side of the support frame 4.

Using FIG. 3 to 5 further explains how the bucket 16 of the molten metal bath is lifted using the ladle lifting device 22.

FIG. 3 shows a perspective view of a metallurgical plant 2 in a state in which the bucket trolley 18, as well as the liquid metal bath bucket 16 located on the trolley 18, are laterally offset relative to the support frame 4. In this state, the push rods 32 of the drive elements 24 are so retracted as far as possible, into the cylinder body 30 of the corresponding drive element 24, the lifting arms 44 being in each case in their lowest position.

If metallurgical processing of the molten metal located in the ladle 16 of the liquid metal bath is to be carried out, the ladle 16 of the molten metal bath is moved first by means of the ladle truck 18 under the vacuum vessel 12. Then, the gripping hooks 46 engage with the gripping spikes 20 of the molten bath bucket 16 (see FIG. 4).

FIG. 4 shows a perspective view of a metallurgical plant 2 in a state in which a bucket trolley 18, as well as a liquid metal bath bucket 16 located on the bucket 18, are located under a vacuum vessel 12, and both gripping hooks 46 are engaged in the gripping spikes 20 of the liquid metal bath bucket 16 . In this case, the push rods 32 of the drive elements 24 are slightly extended from the cylinder body 30 of the corresponding drive element 24, and both lifting beams 44 are in a slightly higher position than in FIG. 3.

From this position, the molten metal bath bucket 16 is lifted using the ladle lifting device 22 until the tubular unit 14 for immersing the vacuum vessel 12 is immersed in the molten metal in the molten metal bath 16 in the ladle 16, so that the metallurgical processing of the melt can be carried out using the vacuum vessel 12 metal (see Fig. 5).

The lifting levers 34 of the bucket lifting device 22 are driven by the drive members 24. To raise the bucket 16 of the molten metal bath, the push rods 32 of all four drive elements 24 are simultaneously pulled down from the corresponding cylinder body 30 at the same amplitude. In this case, each of the drive elements 24 exerts a torque via a connecting rod pin 50 to a corresponding shaft 48, which is subsequently rotationally driven. This in turn leads to the fact that the upper elements 36 of the lifting arms 34, which are connected to the shafts 48 and are not rotatable, in each case rotate / rotate. Due to the rotational / pivoting movement of the upper lever elements 36, the lower lever elements 38 and the lifting beams 44 connected to the lower lever elements 38 are moved upward. Thus, the bucket 16 of the bath of molten metal rises fixed on the lifting beam 44 of the gripping hooks 46.

FIG. 5 shows a perspective view of a metallurgical plant 2 in a state in which the liquid metal bath ladle 16 is raised so that the tube immersion unit 14 of the vacuum vessel 12 is immersed in a molten metal located in the liquid metal bath ladle 16.

In order to lower the liquid metal bath bucket 16 again, the push rods 32 of all four drive elements 24 are synchronously and with the same amplitude pulled upward into the corresponding cylinder body 30. This leads to the fact that the upper elements 36 of the lifting arms 34, which are rotatably connected to the shafts 48, now rotate / rotate in the opposite direction. Due to this rotational / pivoting movement of the upper lever elements 36, the lower lever elements 38 and the lifting beams 44 connected to the lower lever elements 38 are moved down. Thus, the ladle 16 of the bath of liquid metal is lowered by gripping hooks 46 fixed to the lifting arms 44.

The liquid metal bath ladle 16 is lowered, for example, when the metallurgical processing of the molten metal is completed and / or when a replacement of the vacuum vessel 12 is scheduled.

If a replacement of the evacuation vessel 12 is planned, for example, because the lining / lining of the evacuation vessel 12 is to be replaced, the lifting arms 44 of the ladle lifting device 22 are brought to their lowest position in each case, so that the evacuation vessel 12 can be retracted using the shift carriage 10 vessels from the supporting frame 4 (see Fig. 6).

FIG. 6 shows a perspective view of a metallurgical plant 2 in a state in which a vessel change cart 10, as well as a vacuum vessel 12 mounted on a vessel change cart 10 are disposed laterally relative to the support frame 4, and the lifting arms 44 of the ladle lifting device 22 are in each case in its lowest position.

In addition, in FIG. 6, the molten metal bath bucket 16 is located on the bucket cart 18, which is laterally offset relative to the support frame 4.

The description of the following exemplary embodiment is mainly limited to differences with the previous one, discussed in connection with FIG. 1 to 6 an embodiment to which reference is made with respect to the same features and functions. Essentially the same or corresponding to each other elements are indicated, if appropriate, by the same reference numerals, and unmentioned features are adopted in the following embodiment, without being described again.

FIG. 7 shows a perspective view of an alternative metallurgical plant 58. Also, referring to the metallurgical plant 58 of this embodiment, we are talking about an RH installation for decarburization of a molten metal, in particular for decarburization of molten steel.

The smelter 58 also includes a bucket trolley as well as a molten bath tub bucket. However, for better clarity, they are not shown in FIG. 7.

Unlike the metallurgical installation 2 of the previous embodiment, the metallurgical installation 58 of this embodiment has the upper elements 36 of the lifting arms 34 in each case having a protrusion 60 of the lever. For this, the device 22 of the bucket lift of this metallurgical installation 58 does not have connecting rod pins 50.

Further, each of the drive elements 24 is connected at its lower end in each case by a pivot joint 62 with one of the protrusions 60 of the levers. In this embodiment, when raising or lowering the ladle of the molten metal bath, each of the drive elements 24 exerts a torque directly on the upper lever member 36 connected to it.

Further, the drive elements 24 located in each case on one side of the metallurgical installation 58 are spaced apart from each other, this distance between them being approximately 90% of the length of the corresponding shaft 48.

FIG. 8 shows separately the ladle elevator 22 of the metallurgical plant 58 of FIG. 7 in perspective view. In FIG. 8, it is possible to better see the protrusion 60 of the arm of the corresponding upper arm member 36.

Although the invention has been illustrated and described in detail and in detail by means of preferred embodiments, the invention is not limited to the examples disclosed, and other variations can be inferred from here without leaving the scope of protection of the invention.

LIST OF REFERENCE POSITIONS

2 installation

4 support frame

6 longitudinal beam

8 cross beam

10 vessel change trolley

12 evacuation vessel

14 tube immersion unit

16 liquid metal bath bucket

18 bucket trolley

20 gripping spike

22 bucket lift

24 drive element

26 side

28 side

30 cylinder body

32 push rod

34 lifting lever

36 upper lever element

38 lower element of the lever

40 swivel joint

42 bucket gripper

44 lifting beam

46 gripping hook

48 shaft

50 crank pin

52 swivel joint

54 swivel joint

56 swivel joint

58 installation

60 lever protrusion

62 swivel joint

Claims (15)

1. A device for lifting a bucket for a metallurgical plant (2, 58), comprising a lifting lever (34) with a rotatable lever element (36), a first drive element (24) for driving a rotatable element (36) the lifting arm (34) and connected to the lifting arm (34) the first bucket gripping unit (42) for gripping the molten metal bath bucket (16). 2. The device according to p. 1, characterized in that the lifting lever (34) has an upper lever element (36) and connected by a pivot joint (40) with the upper lever element (36) the lower lever element (38), and the upper element (36 ) the lever is mounted rotatably, and the lower element (38) of the lever is connected by a swivel joint (56) to the first bucket gripping unit (42). 3. The device according to claim 1 or 2, characterized in that the first drive element (24) is a lifting cylinder, in particular a hydraulic, pneumatic or electric lifting cylinder, and has a cylinder body (30) as well as a pushing rod (32), moreover, the first drive element (24) is oriented at least essentially in the vertical direction and is located in such a way that its pushing rod (32) can be extended downward from its cylinder body (30). 4. The device according to any one of paragraphs. 1-3, characterized in that it is provided with a horizontally mounted shaft (48), with which the rotatably mounted element (36) of the lifting arm (34) is rotatably connected. 5. The device according to p. 4, characterized in that the shaft (48) has a connecting rod pin (50), with which the first drive element (24) is connected by a pivot joint (54), or the pivotally mounted lever element (36) has a protrusion (60) a lever with which the first drive element (24) is connected by a pivot joint (62). 6. The device according to any one of paragraphs. 1-5, characterized in that it is equipped with a second drive element (24) for driving mounted mounted on the rotation of the element (36) of the lifting arm (34), and the second drive element (24) is parallel to the first drive element (24) . 7. The device according to any one of paragraphs. 1-6, characterized in that the first bucket gripping unit (42) includes a gripping hook (46) for engaging with a gripping spike (20) of the molten metal bathtub bucket (16). 8. The device according to claim 7, characterized in that the first bucket gripping unit (42) includes a lifting beam (44), on which a gripping hook (46) is fixed and which is connected at one of its two ends by a swivel joint (56) with a lifting lever (34). 9. The device according to any one of paragraphs. 1-8, characterized in that it is provided with a second bucket gripping unit (42) and a further lifting arm (34), which is connected by a pivot joint (56) to the second bucket gripping unit (42) and has a rotatably mounted element (36) a lever that can be driven by the first drive element (24). 10. The device according to any one of paragraphs. 1-9, characterized in that it is equipped with two additional drive elements (24) and two additional lifting arms (34), which in each case have a pivotable arm element (36) that can be driven by both additional drive elements (24), one of both additional lifting arms (34) being connected to the first bucket gripping unit (42), and the other of both lifting arms (34) connected to the other bucket gripping unit (42). 11. Metallurgical plant, including a device (22) lifting the bucket according to any one of paragraphs. 1-10 and a support frame (4) for supporting the vessel (12) of metallurgical processing, and the bucket lifting device (22) is mounted on the support frame (4). 12. The metallurgical plant according to claim 11, characterized in that it is provided with a vessel (12) for metallurgical processing, in particular a vacuum vessel, and a cart (10) for changing the vessel on which the processing vessel (12) is mounted, wherein the cart (10) for changing the vessel is mounted on its side on the support frame (4). 13. The method of vertical movement of the ladle (16) of the molten metal bath, in which the rotatably mounted element of the lifting arm (34) of the ladle lifting device (22) is driven by the drive element (24) of the ladle lifting device (22), so that installed with with the possibility of rotation, the lever element (36) makes a pivotal movement, and the ladle (16) of the molten metal bath due to the rotational movement of the pivotally mounted lever element (36) moves vertically connected to the lifting lever (34) a bucket gripping unit (42). 14. The method according to p. 13, characterized in that to raise the bucket (16) of the molten metal bath, the pushing rod (32) of the drive element (24) is extended downward, and further the element (38) of the lifting arm (34) connected to mounted with the possibility of rotation of the element (36) of the lever, moves up. 15. The method according to p. 13 or 14, characterized in that for lowering the bucket (16) of the molten metal bath, the pushing rod (32) of the drive element (24) is pulled upward, and the further element (38) of the lifting arm (34), connected to a pivotally mounted lever element (36), moves downward.

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