EP3728651A1

EP3728651A1 - Tiltable exchangeable metallurgical vessel and method for fixing and releasing a tiltable metallurgical vessel

Info

Publication number: EP3728651A1
Application number: EP18826317.2A
Authority: EP
Inventors: Robert Kapl; Helmut Lechner; Gerald Wimmer
Original assignee: Primetals Technologies Austria GmbH
Current assignee: Primetals Technologies Austria GmbH
Priority date: 2017-12-20
Filing date: 2018-12-19
Publication date: 2020-10-28
Anticipated expiration: 2038-12-19
Also published as: US20200385828A1; CN111465708B; CN111465708A; EP3728651B1; WO2019121858A1; US11168374B2; ES2901693T3; EP3502282A1

Abstract

The invention relates to the subject area of metallurgical systems, in particular a metallurgical vessel (1) which is fixed on a support ring (2). The object of the invention is to provide a metallurgical vessel (1) having a support ring (2) and a method for fixing and releasing, which prevents constraint forces. The tiltable metallurgical vessel (1) having a round cross-section is at least partially surrounded by a support ring (2). The support ring (2) is at a distance from the metallurgical vessel (2) in the radial direction. The metallurgical vessel (2) has at least three brackets (10), each having a respective pin (10). The support ring (2) has at least three receiving openings (14) which receive the pins (10). These receiving openings (14) permit a shifting of the pin (10) in the radial direction. The pins (10) are secured against falling out of the receiving opening (14) and the bracket (12) by at least three locking devices (20) floatingly mounted and arranged inside the support ring (2).

Description

description

Tiltable changeable metallurgical vessel and method for fixing and releasing a tiltable metallurgical vessel

vessel

Name of the invention

The present invention relates to the field of

metallurgical plants, specifically a metallurgical vessel for liquid metals.

On the one hand, the invention relates to a tiltable

Metallurgical vessel with a round cross-section, wherein the metallurgical vessel is surrounded by a support ring - at least partially - and the support ring in the radial direction has a distance from the metallurgical vessel.

On the other hand, the invention relates to a method for fixing a tiltable metallurgical vessel to a support ring, and to a method for releasing a tiltable metallurgical vessel from the support ring.

State of the art

For the production of metals - in particular in the

Steelmaking - tiltable metallurgical vessels are used. These metallurgical vessels are held by a supporting ring surrounding these vessels. The support ring has a distance from the vessel, since - due to high operating temperatures of the liquid metal - the

metallurgical vessel expands. The metallurgical vessel is provided with a lining for receiving liquid steel. This lining must be renewed at certain intervals. Especially in metallurgical vessels for the AOD (argon oxygen decarburization) method, for

Manufacture of stainless steels, a frequent change of lining is required. Not too much

Production time is lost, the metallurgical vessel separated from the support ring and mounted a new vessel with renewed lining. To attach the metallurgical vessel to the support ring, there are different designs. In EP29878 Bl a force-fit connection is shown, which is maintained by folding eyes. The disadvantage of this connection is that the loosening of the screws takes place manually and thus the metallurgical vessel must first be cooled before assembly workers can loosen the screws. In order to perform this release of the folding screws, are by the assembly workers also some

Take precautionary measures to minimize the risk of accidents. All of this work and action takes time and thus reduces productivity. In EP 1533389 Al an automatic tensioning device is disclosed. Here are on the metallurgical vessel locking brackets

welded, which is penetrated by a stud - which is attached to the support ring - interspersed. The stud has a wedge-shaped passage opening in the horizontal direction, as well as the locking console has an opening. Through this passage opening a wedge through the

Locking console and the stud bolt inserted. The wedge is moved by a hydraulic cylinder - which is fixed to the support ring - moves. The disadvantage of this

Device is that larger heat-induced deformations of the metallurgical vessel to deformation of the

Locking console and / or stud lead and connecting and disconnecting locking console and studs is only with difficulty possible, or. first cooling down

has to wait - until the metallurgical vessel has taken almost the original dimensions again.

Summary of the invention

The object of this invention is to provide a tiltable

exchangeable metallurgical vessel, which is fixed to a support ring, to provide, so that despite large temperature differences, a reliable fixing of the metallurgical container with the support ring and also a reliable release is enabled.

The object is achieved in the aforementioned tiltable metallurgical vessel in that the metallurgical vessel has at least three consoles with at least one pin. The support ring also has at least three

Receiving openings. The cones can in this

Penetrate receiving openings, wherein the receiving openings allow a displacement of the pin in the radial direction. The metallurgical vessel has a circular cross-section and the support ring has - at least partially - a circular design. The support ring may be circular or open on one side and a U-shaped or. Horseshoe similar execution. When heated, the metallurgical vessel expands in diameter, which leads mainly to a radial displacement of the brackets and thus the pin.

A floating inside the carrying ring arranged

mounted locking device ensures that the pin is secured against falling out of the receiving opening and the console. Additionally, the floating bearing latching device may so pin

Tension that over the pin the console is pressed onto the support ring.

The receiving openings should be designed so that they are larger than the dimensions of the pin. In

Radial direction of the support ring, the receiving opening is made significantly larger than the dimensions of the pin in this direction. Radial direction is understood in relation to this invention, the direction of the inner radius of the support ring in the direction of the outer radius of the support ring. By this configuration, relative movements, between

Support ring and the metallurgical vessel, which through

Deformation or thermal expansion arise, be enabled. When the metallurgical vessel is re-walled, the temperature range at the outer surface is included

Room temperature and in operation, when liquid metal is in the metallurgical vessel, at temperatures of up to 400 ° C. By heat radiation of the metallurgical vessel heats up especially the support ring on the

metallurgical vessel facing side. This also leads to expansions of the support ring. The relative movements are thus triggered both by movements of the metallurgical vessel, as well as by the support ring. The inside of the

Tragrings floating mounted locking device is used to follow the relative movements during operation. In this context, floating is understood to mean everything that is suitable for permitting relative movements. As floating is thus understood that the locking device is held in a floating bearing in the support ring in a position which secures the pin against falling out of the receiving opening and relative movements - the pin relative to the support ring - follows in at least the radial direction of the support ring. Under floating is understood in the context of the invention that the locking device is not fixedly secured to the support ring, but can move at least in the radial direction of the support ring. This floating bearing latch will, if that

metallurgical vessel is detached from the support ring, temporarily held by holding devices. Such temporary

Holding devices can, for example, encompassing

Be guides that do not hinder the compensation of relative movements - preferably in the radial direction - during operation. If this locking device were mounted in a stationary manner - as in EP 1533389 A1 - this can lead to problems.

Due to relative movements between the support ring and

metallurgical vessel can lead to deformation of a component and thus would be the release of the

Locking device no longer possible, or it could lead to damage of other components. When fixing the metallurgical vessel on the support ring, can through the Floating mounted locking device, an easier securing the pin can be ensured. When

Securing element may be provided a pin, wedge or the like. The pin must be carried out accordingly, so that the connection of the fuse element is made possible with the pin.

During operation of the metallurgical vessel, when liquid metal is in it, thermal expansions occur. The metallurgical vessel is moved during operation - for example, by tilting, occurring vibrations and the like. - what to

Changes in the loads of pins and support ring leads. These changes in the loads additionally favor a slipping of the floating bearings

Locking devices. These movements help prevent the occurrence of coercive forces, as these are due to the slippage of the floating

Locking device can be prevented.

In a particularly advantageous embodiment, the pin should have a wedge pressing surface and the floating bearing locking device a wedge. The wedge is used to secure the pin against falling out of the

Receiving opening and the console, associated with the wedge pressing surface. Possible versions of the

Wedge pressing surface are a lateral passage opening or at least one lateral groove. The lateral

Passage opening or the lateral groove are preferably designed wedge-shaped.

The floating support of the locking device allows compensation to allow the wedge to align while in contact with the wedge pressing surface. This has the advantage that no constraining forces must be exerted when the orientation of the wedge and the

Wedge surface do not match exactly. During insertion of the wedge, the floating locking console automatically aligns itself. Just before a desired end position of the wedge is reached on the wedge pressing surface, the locking device against a Limit limit pressed. This Endlagenbegrenzung makes it possible to exert a corresponding force, so that the wedge can be pressed onto the wedge pressing surface of the pin. During the contacting of the wedge and the wedge pressing surface, the floating bearing can

Locking device as well already at the

Limit stop applied. Under connecting is understood - for example, in a lateral passage opening - that the wedge is pressed into the lateral passage opening. The wedge and the wedge pressing surface are designed so that a bias in the longitudinal direction of

Zapfens is achievable, so the console is pressed onto the support ring.

In the context of this invention is understood by a side passage opening everything that is suitable for a wedge can penetrate. The lateral

Passage opening should extend over the entire cross section, so that at least part of the wedge can penetrate the pin. For the release of the tenon - wedge connection also an end position limitation is necessary. The

End position limit for the release is advantageously opposite the end position limit for fixing.

A preferred embodiment provides that the

Locking device consists of a base body with a base opening through which the pin can penetrate exists. A cylinder is mounted on the body and the cylinder is directly connected to the wedge. This embodiment has the advantage that the pin the

Penetration of base body of the body penetrates and pressed on actuation of the cylinder, the wedge on the wedge pressing surface. The base opening serves as

End position limit, which serves to press the wedge - through the cylinder - according to the wedge pressing surface. One edge resp. an edge surface of the base opening - j ene which is opposite to a mounting of the cylinder - is pressed against the pin during pressing. This ensures that the cylinder has the appropriate force can muster to press in the wedge. These

Embodiment represents a very simple and space-saving design. This design is for small

metallurgical vessels, with a correspondingly small

Support ring, especially suitable.

In a particularly preferred embodiment, the

Receiving openings of the carrying ring elongated holes. These slots extend in the radial direction. This is a particularly preferred embodiment to ensure the relative movement of pin and support ring and thus constraining forces

avoid.

Advantageously, the dimension of the receiving opening in the radial direction is at least twice as large as the dimension of the pin in the radial direction. It should be at least

be ensured that in the radial direction

Relative movement, of at least the dimension of the pin in the radial direction, is possible.

In a particularly advantageous embodiment, a spacer sleeve, through which the pin protrudes, is used on the console.

The pin is supported on the spacer sleeve instead of on the console. The spacer sleeve is designed so that the pin can protrude, but a head of the pin is supported on the sleeve. It is also conceivable that the spacer sleeve between the console and the support ring is located.

This embodiment has the particular advantage that in case of unforeseen events - for example in case of defect of the cylinder - the pin above the support ring

can be cut to lift the metallurgical vessel can. The spacer sleeve should be at least 50mm high. Through this spacer, the accessibility is quite possible and the support ring and the remaining metallurgical vessel are not damaged by the cutting. The cutting can be done in this embodiment, for example, with a Brennschneider. An advantageous embodiment provides that the

Locking device one

Having position monitoring device. Through this

Position monitoring device is always guaranteed that the pin against falling out of the

Receiving opening and the console is secured.

A special design provides that the metallurgical vessel four consoles with spigot and the support ring four

Has receiving openings. To increase safety, a fourth bracket with spigot is attached to ensure the secure connection of support ring and metallurgical vessel in case of failure of a pin. The fourth pin is designed to be redundant and increases the security of the connection of the support ring and metallurgical vessel, thus a safe operation is still guaranteed in case of failure of a pin - wedge connection or cracks in a console.

A further preferred embodiment provides that the position monitoring device, by means of a

Pressure measuring device and a

Position monitoring device of the cylinder takes place. The pressure measuring device serves to ensure that a certain minimum pressure is applied to the cylinder during operation. The

Pressure measuring device also monitors that a maximum pressure is not exceeded. When crossing one

fixed maximum pressure, this could lead to a problem in removing the wedge from the wedge pressing surface. If the wedge is pressed in excessively, the force to pull out the wedge may no longer be felt

suffice. The position monitoring device can be made for example by direct measurement of a position of a piston rod of the cylinder or by measuring the flow rate of the fluid, with which the cylinder is acted upon. By measuring the flow rate, the position of the wedge can be determined. A particularly preferred embodiment for the metallurgical vessel is an argon-oxygen converter, which is a

Capacity of up to 180t. Argon Oxygen Converters (AOD) require frequent replacement because the brick lining is subject to high wear. The metallurgical vessels are usually smaller than metallurgical vessels for other steelmaking processes.

The smaller metallurgical vessels for AOD converter thus also have a smaller support ring. The space requirement within the support ring is lower, bringing the

described floating bearing locking device is particularly well suited for AOD converter.

The object of the invention is also achieved by the method mentioned, which comprises the subsequent steps. A metallurgical vessel having at least three pins is connected to a support ring. The support ring has receiving openings for pins. The pins penetrate when placing the vessel in the receiving openings. As soon as the metallurgical vessel rests on the support ring, is secured by floating in the interior of the support ring Verriegelungsvorriehtungen j eder pin against falling out of the console and the receiving opening, secured, whereby a fixation of the metallurgical vessel is performed on the support ring. Each pin should be secured so that as possible no play between support ring and console occurs. This means that the fuse is made such that the pin is biased as possible. A movement along a longitudinal axis of the pin should be prevented. The support ring and the metallurgical vessel are fixed together in this way. During operation of the metallurgical vessel, relative movements between the journal and the support ring are caused by the floating bearing

Locking device followed, so that by this relative displacement of the floating

Locking device of the relative movement of the pin, opposite the support ring follows. It should Relative movements in the radial direction of the support ring, between bracket with pin and support ring, are made possible, which arise for example by thermal expansion. The

Allowing these relative movements, serves to avoid unwanted deformations of components of the connection of metallurgical vessel and support ring.

An advantageous embodiment of the method provides that the floating bearing locking device is constantly monitored by means of a position monitoring device. This may cause potential problems of

Securing the pin against falling out, from the console and the receiving opening, can be quickly detected during operation.

A particularly advantageous embodiment provides that the floating bearing locking device has a wedge and the wedge with a maximum of 75% of an available maximum force - to remove the wedge - is pressed.

By limiting the force to a maximum of 75% of the maximum available force - to remove the wedge, it is ensured that for the removal of the wedge - from the lateral passage opening or a lateral groove of the pin - are still power reserves available. at

Using a double-acting cylinder is due to the piston rod, for one direction only a reduced force possible. The piston rod reduces the effective area of the piston.

The object of the invention is achieved by the aforementioned method for releasing a fixation of the metallurgical vessel from the support ring. The fixation of pins by floating locking Verriegelrievorriehtungen is solved. For example, in a stud - wedge connection, the wedges are floatingly supported by the wedges

Locking devices removed from the wedge pressing surface of the pins. Subsequently, the metallurgical vessel of Lifting ring lifted. Due to the design with floating locking devices release is much easier, as permanent deformation, by the floating-mounted Verriegelungsvorriehtungen, largely avoided.

Brief description of the drawings

Further advantages and features of the present invention will become apparent from the following description of non-limiting embodiments, reference being made to the following figures, which show:

Fig. 1 is a schematic representation of a converter with a support ring

Fig. 2 is a schematic representation of a metallurgical vessel with a closed support ring and four circumferentially arranged brackets and pins.

Fig. 3 enlarged schematic view of a floating locking device and a pin

Fig. 4 top view of the floating bearing

locking device

Fig. 5a-5d show various embodiments of pins with wedge pressing surfaces and associated wedges

Fig. 6 is a schematic representation of a metallurgical vessel with an open support ring with four circumferentially arranged brackets and pins

Fig. 7 is a schematic representation of a metallurgical vessel with open support ring in the cold and warm state.

Fig. 8 is an enlarged schematic view of one

metallurgical vessel with open support ring in the cold and warm state.

Description of the embodiments Fig. 1 shows a metallurgical vessel 1 and a support ring 2. The metallurgical vessel 1 has three brackets 12 and is connected to the support ring 2, which has three receiving openings 14, by three pins 10. The pins 10 are in each case a floating bearing

Locking device 20, against falling out of the console and the receiving opening 14 of the support ring, secured. The floating-type locking device 20 has a cylinder 22 and a wedge 21. The pin 10 is fixed by the wedge 21.

In Fig. 2 will be another embodiment for the

Connection of a metallurgical vessel 1 with a support ring 2 shown. This embodiment differs in that the support ring 2 is closed. Another difference is that between pin 10 and console 12, a spacer sleeve 13 is attached. This spacer sleeve 13 serves to ensure that in case of failure of the floating

Locking device 20 of the pin 10 and the

Spacer sleeve 13 can be cut, for example, with a welding torch. The receiving openings 14 - designed as elongated holes - extend in the radial direction to allow a relative movement of the bracket and pin relative to the support ring. A

Position monitoring device 28 ensures that the wedge 21 - pin 10 connection is always upright, thus falling out of the pin from the console 12 and the

Receiving opening 14 is prevented. All other

Reference signs have already been explained in the description of FIG.

In Fig. 3, the connection of pin 10 and the

floating latching device 20 shown enlarged. On a base body 23, the cylinder 22 is mounted. The cylinder 22 is directly connected to a wedge 21. This main body 23 has a main body opening 24 which has an end position limit 25, as well as an end position limit for the release 29 is shown. The pin has a wedge pressing surface 11, which serves to the pin 10 - via the wedge 21 - firmly press and thereby the connection between the support ring 2 and

metallurgical vessel to fix. The pin 10 and the base opening 24 have in each case insertion bevels. These chamfers 27, 15, serve to ensure that

floating locking devices 20 are centered upon insertion of the pins 10. These

Insertion bevels 27, 15 represent only one possibility, it is also conceivable that other insertion aids are used. When the wedge 21 does not press on the wedge pressing surfaces 11, the floating bearing locking device 20 is held in position by holders 26. It is also conceivable, for example, that the holding device 26 - as shown - is a encompassing guide 26 and at the same time acts as a limit stop when the

Base body 23 has no base opening 24.

Fig. 4 is a plan view of the floating bearing locking device 20. In this illustration, the essential components such as cylinder 22, wedge 21,

Base body 23 with the base opening 24 and

End position limit 25 shown. The reference numerals in FIG.

4 have already been shown in FIG. 3 explained.

In Fig. 5a and 5b, possible embodiments of the pin 10 and the wedge pressing surface 11 are shown. In the Fig. 5a, it is a passage opening 16 through the pin 10th

shown. In the Fig. 5b, the wedge pressing surfaces 11 are two lateral grooves 17. These are only two examples

represent how these wedge pressing surfaces 11 are executed. It is also conceivable that the pin 10 has only one lateral groove 17. In the Fig. 5 c is a possible embodiment for a wedge 21 - for the passage opening 16 of FIG. 5a - shown. In Fig. 5d is a possible embodiment for a wedge 21 - for the two lateral grooves 17 from FIG. 5b - shown. 6 shows an embodiment of a metallurgical vessel 1 with a support ring 2 and four brackets 12

shown. This embodiment variant has the advantage that in case of failure of a console 12, a pin 10 or the floating bearing locking device (not shown) still safe operation of the support ring 2 fixed metallurgical vessel 1 is guaranteed.

In Fig. 7 and FIG. 8, the expansion of the metallurgical vessel 1 is shown schematically. In operation, the warm metallurgical vessel 3 has a larger diameter - represented by the dotted lines.

Also, the open support ring 2 changes its shape, by a heat radiation of the warm metallurgical vessel 3- from a U-shape to a V-shape. In the Fig. 7 and FIG. 8 is the change of the support ring as a warm support ring. 4

shown. As a result, the position of the pin 10 also changes relative to the receiving opening 14. In FIG. 8, this relative movement is shown enlarged, as is the movement of the floating bearing

Locking device 20 - shown schematically in the lower area. In Fig. 8 can also be seen that the

Relative movement of pin 10 and receiving opening 14 in the region of the open side can be less than

for example, in the lower area, where the

Locking device 20 is shown. In Fig. 8 is the radial displacement of the pin 10 in the

Receiving opening 14 shown. The movement of the floating locking device 20 to follow this radial displacement is shown in FIG. 8 also evident.

Although the invention in detail by the preferred

While embodiments have been further illustrated and described, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the present invention

To leave invention. LIST OF REFERENCE NUMBERS

1 Metallurgical vessel

2 support ring

3 warm metallurgical vessel

4 warm support ring

10 cones

11 wedge press surface

12 console

13 spacer sleeve

14 receiving opening

15 insertion bevel

16 lateral passage opening

17 groove

20 floating latching device

21 wedge

22 cylinders

23 basic body

24 basic body opening

25 limit stop

26 holding device

27 insertion bevel

28 position monitoring unit

29 End position limit for release

Claims

claims

1. A tiltable metallurgical vessel with a round cross section, wherein the metallurgical vessel 1 by a support ring (2), at least partially, is surrounded and the support ring (2) in the radial direction at a distance from

metallurgical vessel (1), characterized

characterized in that the metallurgical vessel (1) has at least three brackets (12) with in each case one journal (10), the supporting ring (2) at least three

Receiving openings (14) which are suitable to receive the pins (10), wherein the

Receiving openings (14) allow a displacement of the pin (10) in the radial direction, and at least three in the interior of the support ring (2) arranged floating bearing locking device (20) are provided, which the pins (10) against falling out of the receiving opening (14 ) and the console (12).

2. Tiltable metallurgical vessel according to claim 1,

characterized in that

- The pin (10) has a wedge pressing surface (11),

preferably has a lateral passage opening (16) or at least one lateral groove (17),

the floating bearing locking devices (20) have a wedge (21),

- The floating-mounted locking device (20) is adapted to bring the wedge (21) for securing the pin (10) against falling out of the receiving opening (14) and the bracket (12) with the wedge pressing surface (11) in combination.

3. Tiltable metallurgical vessel according to claim 2,

characterized in that the floating bearing locking device (20) comprises a base body (23) having a base body opening (24) through which the pin (10) can pass, and a cylinder (22) mounted on the base body (23), and the cylinder (22) is directly connected to the wedge (21).

4. Tiltable metallurgical vessel according to claim 1 or 2, characterized in that the receiving openings (14) of the support ring (2) are slots.

5. Tiltable metallurgical vessel according to claim 1 - 4, characterized in that the pin (10) in

Radial direction of the metallurgical vessel (1) has a dimension and the receiving opening (14) in the radial direction at least twice as large as the dimension of the pin (10) in the radial direction.

6. Tiltable metallurgical vessel according to one of

preceding claims, characterized in that on the bracket (12) has a spacer sleeve (13) through which the pin (10) protrudes, is attached.

7. Tiltable metallurgical vessel according to one of

preceding claims, characterized in that the floating bearing locking device (20) has a position monitoring device (28).

8. Tiltable metallurgical vessel according to one of

preceding claims, characterized in that the metallurgical vessel (1) has four brackets (12) with pins (10), the supporting ring (2) has four

Receiving openings (14) and in the interior of the support ring (2) four floating mounted

Locking devices (20) are present.

9. A tiltable metallurgical vessel according to claim 2,

characterized in that the

Position monitoring device (28), by means of a pressure measuring device and a

Position monitoring device of the cylinder (22), takes place.

10. A tiltable metallurgical vessel according to claim 1, characterized in that the metallurgical vessel (1) is an argon oxygen converter with a capacity of up to 180t.

11. A method for fixing a tiltable metallurgical vessel to a support ring according to claim 1-10, characterized in that the metallurgical vessel (1) is brought into such a manner with the support ring (2) that pin (10) in receiving openings (14) penetrate as soon as the metallurgical vessel (1) rests on the support ring (2), and thereafter secured by floating locking devices (20) j tener pin (10) from falling out of the console (12) and the receiving opening (14).

12. A method for fixing a tiltable metallurgical vessel to a support ring according to claim 11, characterized in that the floating bearing

Locking device (20) by means of a

Position monitoring device (28) is constantly monitored.

13. A method for fixing a tiltable metallurgical vessel to a support ring according to claim 12, characterized in that the floating bearing

Locking device (20) has a wedge (21) for securing the pin (10), and the wedge (21) with a maximum of 75% of the available maximum force, which is possible for removal of the wedge (21), is pressed.

14. A method for releasing a fixation of a tiltable metallurgical vessel to a support ring according to claim 11, characterized in that the fixing of pins (10) by floating mounted

Locking devices (20) is released and then the metallurgical vessel (1) is lifted off the support ring (2).