WO2007028535A1

WO2007028535A1 - Tiltable metallurgical vessel

Info

Publication number: WO2007028535A1
Application number: PCT/EP2006/008501
Authority: WO
Inventors: Rudolf Gruber; Martin Hirschmanner; Gerhard Losbichler; Guenther Staudinger
Original assignee: Siemens Vai Metals Technologies Gmbh & Co
Priority date: 2005-09-09
Filing date: 2006-08-31
Publication date: 2007-03-15
Also published as: EP1920076A1; AT502333A1; BRPI0615886A2; US20080265474A1; CN101263232B; CN101263232A; ES2322399T3; EP1920076B1; KR20080053358A; ZA200802973B; RU2008113841A; DE502006002964D1; RU2410443C2; AT502333B1; ATE423857T1

Abstract

In the case of a tiltable metallurgical vessel having a carrying ring (2) at least partially enclosing the metallurgical vessel at a distance therefrom, supporting brackets, which are fastened on the metallurgical vessel, rest on the carrying ring, and the metallurgical vessel is fixed in a releasable manner on the carrying ring by a plurality of clamping means (6, 5a, 6b) which can be actuated by pressure-medium cylinders (14), wherein each clamping means interacts with a locking bracket (7) fastened on the metallurgical vessel and the clamping means (6) is designed such that it can be moved from a release position (B), in which it releases the locking bracket, into a clamping position (A), in which it braces the locking bracket and is braced with the carrying ring, and vice versa. In order to allow for a secured connection between the carrying ring and metallurgical vessel in an easy-to-install manner, and using just a small number of components, it is proposed that the clamping means comprises at least one housing (8), a clamping anchor (9), a pivot lever (12) and a pressure-medium cylinder (14), which acts on the pivot lever, that the clamping anchor (9) is guided in a pivotable manner in a guide means (10) in the housing (8) and is articulated in a pivotable manner on the pivot lever (12), and that the pivot lever is supported in a pivotable manner in the housing.

Description

Tiltable metallurgical vessel

The invention relates to a tiltable metallurgical vessel with a metallurgical vessel at least partially surrounding the support ring, wherein the metallurgical vessel mounted support brackets rest on the support ring and the metallurgical vessel is releasably fixed to the support ring with a plurality of actuatable pressure medium cylinder clamping devices, each clamping device with an am metallurgical vessel fastened locking console cooperates and the tensioning device is designed to be movable from a release position releasing the locking console into a clamping position spanning the locking console and with the support ring and vice versa.

In particular, the invention relates to a tensioning device for supporting and securing a tiltable converter on a support ring at least partially surrounding it at a distance.

Metallurgical vessels of this type, as they are used mainly in steel mills for the production and processing of molten steel, are exchangeable vessels that need to be replaced at intervals to renew their refractory lining or make any other repairs to them.

Tiltable metallurgical vessels, such as converters, are exposed to high thermal loads due to the metallic melt they treat and release large amounts of heat into the environment through radiation. In order to keep the thermal load of the support structure of the metallurgical vessel low, this vessel is therefore usually arranged in a support ring which is designed either as a closed annular or open horseshoe-shaped welded construction. The support ring is pivotable about a horizontal axis and has trunnions which are mounted in a support frame. The metallurgical vessel can be arranged in this support ring either hanging or resting on it or supported on it. Such possible embodiments are described in detail in EP-B 0 029 878 B1, wherein a frictional connection between the support claws on the metallurgical vessel and Support straps on the support ring of hinged screws is maintained. With the prestressed hinged screws sideways movement of the metallurgical vessel is avoided even in a tilted position of the vessel. For the manual release of the hinged screws, however, not only a considerable amount of time is required, these work are also extremely difficult for the maintenance personnel due to the effects of heat, dust, the risk of falling and the cramped space in this area and can only be carried out with great safety.

In order to minimize the risk of accidents for the maintenance personnel and to simplify the assembly work, the fastening systems have been improved. For example, from DE 102 51 964 A1 discloses a quick change attachment for a metallurgical treatment vessel on a support ring known in which opposing vessel brackets and support ring brackets by means of a snap closure to each other in a secured closed position braced and easily in an opposite direction of actuation are releasable (release position). For clamping and releasing these hinged closures, a manually attached hydraulic handling device is proposed, whereby, however, the fundamental problem of a dangerous use for the maintenance personnel is not really solved.

From DE 25 1 1 610 A1 and EP 1 533 389 A1 embodiments of clamping devices are already known, which avoid the immediate use of the maintenance personnel to release the clamping elements on the support ring at a great height above the hut floor in that the clamping and release operation Hydraulic elements takes place. In the embodiment according to FIG. 9 of DE 25 11 610 A1 and in the embodiment according to FIGS. 4a and 4b of EP 1 533 389 A1, the tensioning device respectively comprises a pair of hooks with which a bracket on the converter is gripped like a pliers and thus acts in the direction of the support ring Compressive forces are applied, which fix the converter in its position on the support ring. The arrangement of the linkage in the manner of a toggle mechanism ensures a self-locking clamping position of the clamping device. The other embodiments of clamping devices shown in DE 25 1 1 610 A1 are significantly more complicated in their structural design and require a successive operation of pressure cylinders, wherein in a first step of the clamping operation Bearing bush locking element is pivoted into a clamping position and is fixed in a ^"second step of this bearing bush locking element with a cross-tie rods. However, this last-cited embodiment is not suitable for the specific use.

The present invention aims at avoiding these disadvantages and difficulties and has as its object to propose a tiltable metallurgical vessel in a further embodiment, in which the production of a secure connection and the opening of this secure connection between a metallurgical vessel and a support ring with a minimum number of components in a largely protected from heat and slag ejection environment can be performed.

This object is achieved in that the clamping device comprises at least one housing, a clamping armature, a pivot lever and an acting on the pivot lever pressure cylinder, that the clamping armature is pivotally guided in a slotted guide in the housing and hinged pivotably on the pivot lever and that the pivot lever in the housing pivotally is supported.

An expedient further embodiment of the device according to the invention is that the clamping anchor has a clamping anchor shaft and a clamping head with a support surface, that the locking console has an insertion slot for receiving the clamping anchor shaft and a mating support surface for supporting the clamping head, that in the clamping position, the support surface of the clamping head is pressed against the mating support surface of the locking console and in the release position, the clamping head is positioned outside of the insertion slot and allows a lift-off movement of the metallurgical vessel from the support ring. With this particular design of the tension anchor and the locking console, a central, normally acting on the locking console clamping force is applied using only a single pivotable and tensioning anchor, which acts parallel to the converter axis.

By the clamping device forms or includes a toggle mechanism, which triggers a self-locking in the clamping position in a breakdown point and its Displacement is limited by a stop, which is preferably formed by the groove end of the slotted guide, the advantage achieved in itself already known clamping devices is realized equally in the simple design according to the invention in the same way. However, it is also possible to provide a stop limiting the displacement at a different location in the housing of the clamping device or in another way to achieve the same effect.

The tensioning device is designed for a high clamping force ensuring the secure maintenance of the tension, taking into account forces and moments which occur in particular during tilting of the metallurgical vessel during charging and discharging. Thus, the breakdown point of the toggle mechanism can be traversed, it is necessary that the tensioning device is associated with an expansion element, with the otherwise occurring during driving through the breakdown point tensile stresses are limited in height. Suitably, the expansion element is integrated in the clamping anchor. Preferably, the expansion element comprises a spring assembly formed by a plurality of disc springs.

The tensioning device is based on a special kinematics. This is determined by arranging a special slotted guide in the housing of the clamping device so that the clamping head of the clamping armature during the transition from the clamping position to the release position in a first phase of movement of the mating support surface on the locking console contrasting, thus predominantly in a direction normal to the counter support surface on the Locking console is moved and that the clamping head of the clamping armature is moved in a further movement phase with a predominantly pivotal movement of the region of the insertion slot of the locking console. Due to the special first movement phase, which includes the lifting of the clamping head of the counter-support surface on the locking console, an action of horizontal forces on the clamping device due to a frictional horizontal movement of the clamping head is avoided.

The slide guide in the housing of the clamping device is formed by an arcuate in its longitudinal extension groove into which a guide pin of the clamping armature engages and is guided in its sliding. Due to the arrangement of all components of the clamping device in a common housing, which is not an integrated part of the support ring, the clamping device forms a preassembled module that can be easily mounted on corresponding wall elements of the support ring. This in turn results in advantages for the maintenance personnel and the plant availability, since each clamping device can be replaced in case of necessary maintenance work within a very short time.

Preferably, pneumatic cylinders are used to actuate the tensioning device.

Damage to the clamping device and in particular of the pressure cylinder by slag and Stahlauswürfe, especially during the Blasphase in a steel-producing converter, or by Wandlerermund crashing slag and Metallbären can be avoided by the locking console is surrounded by an open towards the support ring housing and this enclosure is attached to the metallurgical vessel. In addition, the pressure cylinder and the moving parts of the clamping device are housed protected in the housing of the clamping device and optionally shielded by components of the support ring.

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

1 shows a supported in a support ring converter according to the prior art in a schematic representation,

2 shows the clamping device according to the invention in an intermediate position between the clamping position and the release position in an oblique,

3a shows the arrangement of the clamping devices according to the invention on the support ring with not shown converter vessel in the clamping position,

3b shows the arrangement of the clamping devices according to the invention on the support ring with not shown converter vessel in the release position, 4 shows the clamping device according to the invention in the clamping position, in an intermediate position and in the release position,

5 shows a longitudinal section through the clamping anchor with an expansion element,

Fig. 6 details of the slotted guide.

In Figure 1, the basic structure of a converter plant in a steel mill in a crack is shown schematically. The converter 1, consisting of a steel casing and an inner, not shown refractory lining, is supported in a support ring 2 with a short distance to the converter. As a result, the thermal load of the support ring is kept low by the hot converter vessel. The support ring 2, which is usually designed as a horseshoe-shaped frame construction, is rotatably supported by two support pins 3a, 3b in a support frame 4 and equipped with a tilt drive, not shown here, whereby the adjustment of a vertical or an inclined operating position of the converter for charging feedstocks, blasting of the crude steel or parting of the liquid steel is made possible. At the steel outer shell of the converter a plurality of brackets 5a, 5b are welded, with which the converter rests on the support ring 2 in not shown pads. By appropriate tensioning devices 6a, 6b, which are formed in the prior art of screw or a fluid-actuated linkage, the brackets 5a, 5b and thus the converter 1 are fixed in its predetermined position to the support ring 2 and this position even in the tilted operating position held by the converter.

The clamping device 6 according to the invention is shown in Figure 2 in a possible embodiment as a preassembled module in the installed position to a welded to the converter, not shown locking console 7. The clamping device 6 comprises a housing 8, which consists of several steel plates and which forms a frame for receiving the individual components of the clamping device 6 as a welded construction. One or more support plates 8a, 8b of the housing with a machined mounting surface allow rapid assembly of the entire clamping device at the designated positions of the support ring 2 (Fig. 3a, 3b). At two of the support plate 8a normally towering and parallel to each other positioned support plates 8c slide guides 10 are provided which are opposite to each other and in which a clamping anchor 9 is slidably guided. In this case, each ^" a guide pin 1 1 of the clamping armature 9, two of which are provided opposite each other, engages in the groove of a slotted guide 10. Swivel levers 12 are pivotally mounted with their one end in a support bearing 13 in the support plates 8c A trained as a pneumatic cylinder Pressure-medium cylinder 14 is tiltably supported in bearing housings 15, which are likewise fastened to support plates 8c. Pressure-medium cylinder 14 engages pivoting joint 16 with its piston rod 14a at the further end of pivot lever 12. Preferably in the middle of pivot lever 12 tension armature 9 is in one Swivel joint pivotally supported 17. The movement of the clamping armature 9 is thus clearly defined by the pivoting movement of the pivot lever 12 in the support bearing 13 and by the course of the slotted guide 10. The clamping anchor 9 comprises a clamping anchor shaft 18 and at its end a clamping head 19 having a larger diameter has as the Spannankerschaft 18. Solcherart results in a circular ring surface, which forms a support surface 20 on the not visible in Figure 2 underside of the clamping head 19. With the clamping anchor shaft 18 of the clamping anchor 9 projects through the locking console 7, which has a U-shaped insertion slot 21 in the passage region of the clamping anchor shaft 18. In the edge region of the U-shaped insertion slot 21, a counter-support surface 22 is formed, wherein the support surface 20 and the counter-support surface 22 come to coincide in the clamping position.

The clamping anchor 9 is equipped with an expansion element 26, which is shown in Figure 5 in a longitudinal section. The Spannankerschaft 18 consists of two parts, a clamping head 19 carrying upper clamping anchor shaft 18a and a mounted in the pivot joint 17 lower clamping armature shaft 18b. The upper clamping anchor shaft 18a is fixed in position in a housing 27a of a two-part housing 27a, 27b of the expansion element. The lower clamping anchor shaft 18b passes through the bottom of the housing 27b and carries a thrust washer 28. In an annular recess of the housing 27b, a cup spring assembly 29 between the bottom of the housing 27b and the pressure plate 28 is inserted. The two parts of the two-part housing are bolted together. This expansion element allows when passing through a breakdown point of the kinematic system of the clamping device shortly before reaching the clamping position and in the very first phase of the release process, an extension of the clamping anchor shaft 18, whereby the Driving through the breakdown point is made possible only by the applied by the pressure cylinder cylinder locking or release force is limited.

The slotted guide 10 is associated with the opposing support plates 8c of the housing 8 of the clamping device. It consists essentially of curved guide grooves 30 in which the guide pin 11 slidably engages. The guide pin 1 1 is connected to the clamping anchor 9 and oriented normal to the longitudinal axis of the clamping armature and parallel to the pivot axis of the Schenk joint 17. In the clamping position, the guide pin 1 1 is in an end position in the guide groove 30, as shown in Figure 6. The wall of the guide groove forms at this point a clamping movement of the clamping device limiting stop 31. The groove width is increased in this area to provide clearance for the guide pin, if the support ring slightly twisted due to the thermal influences. The arc shape of the guide groove is chosen so that an optimal lifting and clamping movement of the clamping armature is given.

In Figures 3a and 3b, the support ring 2 is shown with the necessary for the reception of a converter centering devices 24 and three clamping devices 6 in an oblique view. From converter vessel itself, only the locking brackets 7 are indicated because of the clarity of the illustration. The figure representations show three centering devices 24, which offset from each other by 90 ° to each other offset from the support plate of the support ring and where the aufzusetzende converter is centered in its position. Of the three clamping devices 6, which are arranged distributed on horseshoe-shaped support ring, each includes a clamping device on the front side at the ends of the support ring and a further clamping device is positioned centrally on the outer surface of the support ring. The clamping devices are designed as a preassembled module and mounted as such on the support ring. The pressure medium cylinders 14 are arranged in a particularly protected area on the underside of the support ring. However, it is also possible to integrate the clamping devices in their structural structure in the support ring. FIG. 3 a shows the tensioning device in the clamping position A, and FIG. 3 b shows the tensioning device in the release position B.

With reference to the two operating positions shown schematically in Figure 4 in an image sequence and an intermediate position of the clamping device, the clamping and releasing operation of the converter is described in detail on the support ring in detail: The upper picture shows the clamping device 6 and the locking console 7 in the clamping position. The guide pin 1 1 of the clamping armature 9 is located in the lower end position of the guide slot 10 and the pressure medium cylinder 14 is located in the end position provided for the clamping position. These positions are determined so that a self-locking of the kinematic system is present and only after passing through a breakdown point with appropriate pressurization of the pressure cylinder, a release of the tension between the converter and the support ring is possible. In this case, the force applied by the disc spring assembly of the expansion element resistance force must be overcome. The lifting movement of the clamping armature and in particular of the clamping head of the opposite support surface of the locking console is substantially determined by the slotted guide. Upon further loading of the pressure medium cylinder, in a first movement phase of the tension anchor, the clamping head 19 lifts off from the counter support surface 22 by a movement that proceeds predominantly in a direction normal to the counter support surface. In a further movement phase, the clamping head is predominantly stamped with a pivoting movement. In this phase, a position of the clamping armature is achieved as shown in the middle image of the image sequence. Upon further loading of the pressure cylinder, the guide pin 11 of the clamping armature 9 moves into the upper end of the slide guide 10 and the pressure medium cylinder 14 reaches the end position corresponding to the release position of the clamping armature. In this position, the chuck is wholly outside the insertion slot 21 of the locking console 7, as shown in the lower picture of the image sequence of Figure 4. In this release position, the converter can be lifted off the support ring or inserted into the support ring. The clamping of the converter used is carried out with reversed sequence of the described release process.

Claims

claims:

1. Tiltable metallurgical vessel, in particular a converter, with a metallurgical vessel at least partially surrounding the support ring (2), wherein the metallurgical vessel mounted support brackets rest on the support ring and the metallurgical vessel on the support ring with a plurality of pressure medium cylinder (14) actuatable clamping devices ( 6, 5a, 6b) is releasably fixed, each clamping device cooperating with a locking console (7) fastened to the metallurgical vessel and the tensioning device (6) from a release position (B) releasing the locking console into a clamping position (B) spanning the locking console and with the support ring (Fig. A) and vice versa is designed to be movable, characterized in that the clamping device comprises at least one housing (8), a clamping anchor (9), a pivot lever (12) and an acting on the pivot lever pressure medium cylinder (14) that the clamping anchor (9) in a link guide (10) in the housing (8) s guided swiveling and pivotally articulated on the pivot lever (12) and that the pivot lever is pivotally supported in the housing.

2. Tiltable metallurgical vessel, characterized in that the

Clamping anchor (9) has a clamping anchor shaft (18) and a clamping head (19) having a support surface (20) that the locking console (7) has an insertion slot

(21) for receiving the Spannankerschaftes (18) and a counter-support surface

(22) for supporting the clamping head, that in the clamping position (A), the support surface of the clamping head is pressed against the mating support surface of the locking console and in the release position (B) of the clamping head is positioned outside the insertion slot and a lift-off movement of the metallurgical vessel from the support ring allows ,

3. Tiltable metallurgical vessel according to one of the preceding claims, characterized in that the clamping device (6) has a Toggle mechanism forms or includes, which in the clamping position (A) in a breakdown point triggers a self-locking and whose displacement is limited by a stop (31).

4. Tiltable metallurgical vessel according to claim 3, characterized in that the stop (31) of the slotted guide (10) is formed.

5. Tiltable metallurgical vessel according to one of the preceding claims, characterized in that the tensioning device (6) is associated with an expansion element (26).

6. Tiltable metallurgical vessel according to claim 5, characterized in that the expansion element (26) in the clamping anchor (9) is integrated.

7. Tiltable metallurgical vessel according to claim 5 or 6, characterized in that the expansion element (26) by a cup spring assembly (29) is formed.

8. Tiltable metallurgical vessel, according to one of the preceding claims, characterized in that the slide guide (10) in the housing (8) of the clamping device is arranged so that the clamping head (19) of the clamping armature (9) during the transfer of the clamping position ( A) in the release position (B) in a first movement phase of the counter support surface (22) on the locking console (7) is moved lifting and that the clamping head (19) of the clamping armature (9) in a further movement phase with a pivoting movement of the Insertion slot (21) of the locking console (7) is moved.

9. Tiltable metallurgical vessel according to one of the preceding claims, characterized in that the slide guide (10) is formed in the housing of the clamping device by an arcuate guide groove (30) into which a guide pin (1 1) of the clamping anchor (9) engages and in you are led sliding.

10. Tiltable metallurgical vessel according to one of the preceding claims, characterized in that the clamping device is designed as a preassembled module and is releasably secured to the support ring.

1 1. Tiltable metallurgical vessel according to one of the preceding claims, characterized in that the pressure medium cylinder (14) is a pneumatic cylinder.

12. Tiltable metallurgical vessel according to one of the preceding claims, characterized in that the locking console (7) is surrounded by an open towards the support ring housing and this enclosure is attached to the metallurgical vessel.