EP2454038A1

EP2454038A1 - Method for securing a start-up strand in a continuous casting system and continuous casting system having a start-up strand

Info

Publication number: EP2454038A1
Application number: EP10728647A
Authority: EP
Inventors: Kurt Fellinger; Paul Pennerstorfer
Original assignee: SIEMENS VAI METALS TECHNOLOGIES GmbH; Siemens VAI Metals Technologies GmbH Austria
Current assignee: Primetals Technologies Austria GmbH
Priority date: 2009-07-17
Filing date: 2010-06-25
Publication date: 2012-05-23
Anticipated expiration: 2030-06-25
Also published as: KR101757634B1; CN102470428B; ES2537232T3; AT508517A1; CN102470428A; RU2527568C2; AT508517B1; BR112012001068A2; EP2454038B1; KR20120037994A; WO2011006748A1; RU2012105534A

Abstract

The invention relates to a method for securing a start-up strand in a strand guide of a continuous casting system, and a continuous casting system comprising a start-up strand. The aim of the invention is to disclose a method and a continuous casting system, wherein the stopping and securing of the start-up strand against an uncontrolled crash takes place by means of independent systems, and wherein the securing of the start-up strand takes place by a separate element in the strand guide and independent of the continuous casting process. The securing of the start-up strands should also take place regardless of the weight of the start-up strand. Said aim is achieved by a method of the type mentioned above, such that the start-up strand (4) is secured by threading in and retaining at least one stop device (8, 8a, 8b, 8c) connected downstream in the strand conveyor direction (R); and that securing and releasing the start-up strand (4) by means of the stop device (8, 8a, 8b, 8c) takes place by blocking and releasing a transport path (6) formed by the strand guide rollers (7, 7a, 7b, 7c).

Description

Method for securing a starter train in a continuous casting plant and continuous casting plant with a starter train

Technical area

The invention relates to a method for securing a

Anfahrstrangs in a strand guide of a continuous casting and a Ξtranggießanlage with a starter strand. Specifically, the invention relates to a method for securing a starter strand in a strand guide comprising a plurality of strand guide rollers continuous casting, wherein

the dummy bar when threading drivable

Transported strand guide rollers;

- The starter strand before the casting start in a, a mold on the output side closing, starting position of

adjustable strand guide rollers held; and

the dummy bar and one after casting

forming cast strand of drivable

Strand guide rollers is pulled out.

Furthermore, the invention relates to a continuous casting plant with a mold and a downstream in the ftrangförderrichtung strand guide, and with a Anfahrstrang which closes the mold at the start of casting exit and in the strand guide of engageable and driven

Strand guide rollers can be held and moved, wherein the strand guide rollers a transport path for the

Forming the starting line.

State of the art

Before the start of a casting process, the mold is

on the output side closed with the head of a starter strand. The starter line is either from below in one

Upward movement along the strand guide usually promoted with engageable and driven strand guide rollers to the mold and in this starting position of the

Strand guide rollers held or starting from the Casting platform conveyed from above through the mold and then in the strand guide in turn by the engageable and

drivable strand guide rollers held in the starting position.

An operating error or a failure in a - the adjusable and drivable strand guide rollers - means of electrical, hydraulic, pneumatic or

Communication can lead to a sudden, constantly accelerating downward movement of the heavy

Anfahrstrangs lead in the strand, with this movement, the so-called. Crash, typically over a large distance {. continues over several strand guide segments and / or traction roller scaffolding). This risk is particularly high in vertical casters, as this

System type has a vertical führungtrangführung. At the

Crash of the starter train can lead to personal injury as well as damage to individual plant components. For safety reasons, the operating staff is therefore staying in hazardous areas during this time

Operating phase not allowed.

To avoid such disturbances, it is already known from DE 19 53 094 Al, in sheet continuous casting in the travel of the Anfahrstrangs a frictional

To arrange locking device. Thus, the Anfahrstrang is held by a clamp in the start position until the beginning of the casting process of the dummy train of the

drivable and engageable strand guide rollers with the desired casting speed is moved through the strand guide. The locking device is located in

Strangförderrichtung behind the straightening in the area of the outlet roller table of the continuous casting. The embodiment described requires a very long Anfahrstrang and is not suitable for short Anfahrstränge or for use of different length Anfahrstränge. In addition, the use of a heavy starting line is problematic due to the clamping. Presentation of the invention

Object of the present invention is to avoid the disadvantages of the prior art described and a

Method for securing the starter train in one

Continuous casting plant and a continuous caster with start-up to suggest, in the

holding and securing the dummy bar against an uncontrolled crash through each other

independent systems takes place; and at the

securing the starter train with respect to one

uncontrolled crash from a separate, from

continuous casting operation independent, element takes place in the strand guide.

Another object of the invention is that the

Anfahrstrang both while threading, while holding in the

Starting position and after the start of pouring can be secured. Furthermore, the securing of the Anfahrstrangs should be independent of the weight starter strand and in particular work well even with very heavy Anfahrsträngen.

This object is achieved on the basis of a method of the type described in the introduction by

that the starter strand during threading and holding at least one, downstream in the strand conveying direction,

Locking device is secured; and

- That the securing and unlocking of the Anfahrstrangs done by means of the locking device by closing and releasing a transport path formed by the strand guide rollers.

According to the method of the invention, the Anfahrstrang is transported when threading drivable strand guide rollers in the strand guide in the direction of mold and

then before the pouring in a mold

Output side closing start position held by engageable strand guide rollers. To the crash of the

To prevent startup line, the starter strand is

Thread and hold at least one in Strangförderrichtung downstream locking device secured, ie the movement of the Anfahrstrangs in

Strand conveying direction is determined by at least one

Locking device locked. As a result, the Anfahrstrang is secured both during threading, while holding and during Ausfördern against an uncontrolled crash. The securing and unlocking of the starter train is done by means of a

Locking device by closing and releasing a transport path formed by the strand guide rollers, whereby the securing of the starter strand is largely independent of the weight of the Anfahrstrangs.

In an advantageous embodiment, several

Locking devices in the strand guide (e.g., comprising one or more strand guide segments or

Treibrollengerüste) distributed, which when threading the

Seeking strand sequentially secured and sequentially unlocked after the casting start. The sequential saving, i. the locking, when threading takes place against the

Strand transport direction, whereas the sequential transport

Unlock, i. unlocking, after pouring in

Strangtransportrichtung takes place. By the sequential

To unlock the pacemakers, the foundry runs undisturbed from securing the dummy bar. In addition, the securing of the Anfahrstrangs by multiple, distributed in the strand guide, locking takes place largely independent of the length of the AnfahrStrangs, whereby the backup of very short Anfahrsträngen is possible. Through the multiple Ärretiereinrichtungen is further the distance in a crash to the interception of the Anfahrstrangs in the

Strand guidance reduced, whereby the security is increased.

In an advantageous embodiment, a secures

Arretiereinrichtung in case of failure of a device of electrics, hydraulics, pneumatics or communication automatically the Anfahrstrang. As a result, the safety when threading, holding and Ausfädeins the Anfahrstrangs increased. In a further advantageous Äusführungsform the automatic securing of the starter strand takes place without external, ie from outside the locking device, energy. As a result, the security when threading, holding and Ausfädeins the Anfahrstrangs is further increased

In a sudden loosening and crashing of the Anfahrstrangs the Anfahrstrang is intercepted by a, downstream in Ξtrangförderrichtung, locking and prevented from further downward movement. This will

ensured that in case of a crash no

operationally relevant component, in particular no segment or an engageable role is damaged. In order to implement as directly as possible the

It is the method of the invention which solves the problem underlying the invention

advantageous that in the strand guide at least one

Arretiereinrichtungen is arranged for the Anfahrstrang, which lie from an outside of the transport path

Release position in a the transport path of the Anfahrstrangs locking collection position is formed displaced back and forth. By means of this device is the

Anfahrstrang secured form-fitting, whereby a high operational reliability is achieved even for very heavy Anfahrstränge.

To achieve the advantages of the invention, it is irrelevant whether the continuous casting as a vertical or Bogenstranggießanlage, and whether the continuous casting for the

Production of billets (engl. Bloom), billets (engl.

Billet), pre-profiles (English, beam blank) or slabs (English slab) is formed.

In addition, it does not matter if the Anfahrstrang is designed as a link chain or rigid, or has a straight or curved shape.

In an expedient embodiment is a

Arretiereinrichtung on a front side of a Ξpassage guide segment or a drive roller frame or between two, adjacent in the strand conveying direction,

Strand guide rollers, preferably driven

Strand guide rollers, arranged. As a result, the force for securing or intercepting the Anfahrstrangs over the

Locking device in an advantageous manner in the strand guide segment or in the drive roller frame

initiated. Alternatively, a locking device can also be arranged in a separate support structure. By means of this embodiment, it is possible, the locking device regardless of strand guide segments or

Assemble and disassemble drive roller stands.

A simple embodiment is a

Locking device as a sliding or

form swivel bolt, wherein the bolt is designed to be displaced by a Betätigungsvorrichung. It is particularly advantageous to use the bolt and the actuating device in an assembly, e.g. As a cassette, form so that this module can be easily and quickly assembled or disassembled. Another embodiment is a

Locking device form as a displaceable, inclined plate or a displaceable, obliquely lying bolt, wherein the dead weight of the locking device defines the basic position of the locking device and the locking device is displaceable via an actuating device in the release position. This will

ensures that the locking device at a

Failure of the actuator automatically the

Starter line secures.

Another embodiment is that the

Actuating one, eg pneumatic or hydraulic, accumulator comprises, wherein the pressure accumulator formed by means of a pressure medium cylinder Actuator the basic position of

Locking device defined. This ensures that the locking device in case of failure of

Actuator automatically secures the Anfahrstrang.

Another embodiment is that the

Actuator comprises a spring, wherein the

Spring force the basic position of the locking device

Are defined. This will ensure that the

Arretiereinrichtung in case of failure of

Actuator automatically secures the Anfahrstrang.

In a further advantageous embodiment, the Anfahrstrang a transverse to the transport path recess, preferably a slot or a U-shaped recess, and the Anfahrstrang on, in the recess

engaging, sliding bolt, is secured.

An alternative embodiment is that a locking device is designed as a displaceable or pivotable plate, wherein the plate of a

Betätigungsvorrichung is designed to be displaced.

Further advantages and features of the present invention will not become apparent from the following description

Restrictive embodiments, reference being made to the following figures, which show the following:

Fig. 1 is a schematic representation of the hedging when threading a starter strand in a

Vertical caster with strand guide segments

Fig. 2 is a schematic representation of hedging when holding and pulling out of the Anfahrstrangs

Fig. 3 is a perspective view of a

Strand guide segment with a locking device for securing a starter strand Fig. 4 is a schematic representation of the hedging when threading a starter strand in a

Vertical caster with drive roller frame Fig. 5 is a schematic representation of a part of

Strand guide a vertical caster with a

locking

In Fig. 1 is a vertical caster in a

Longitudinal section with the components essential for the invention shown schematically. It comprises a mold 1, in which a cast strand of molten steel is formed during the casting process, and a subsequent vertical

Strand guide 2, in which the casting continuously

cooled, guided and supported. The strand guide is formed by a series of strand guide segments, of which four führungstrangführungssegmente 3a, 3b, 3c, 3d are shown representatively. The transport path 6 for the Anfahrstrang 4 and the cast strand through the strand guide 2 is formed by two rows of strand guide rollers 7 a and 7 b, in

Groups are summarized and stored in the strand guide segments 3a to 3d. A series of strand guide rollers 7a is fixedly supported on the outside of the strand guide segment and the second series of strand guide rollers 7b is on the inside of the strand guide segment

arranged relatively movable to the first row of strand guide rollers. This relative mobility, for example, allows adjustment to a desired strand thickness or thickness reduction in a cast strand with e.g. still liquid core. As shown in more detail in Fig. 3, the outer and the inner strand guide rollers 7a and 7b are rotatably supported in a support frame. Some of the strand guide rollers 7a, 7b are drivable

Strand guide rollers 7c and / or as engageable

Ξtrangführungsrollen 7d trained and determine the

Speed of the cast strand or the

Discharge speed of the Anfahrstrangs 4. To close the mold 1 before the pouring start of the continuous casting on the output side, a starter strand 4 from below in the Threaded strand guide 2. To secure the Anfahrstrangs 4, the strand guide segments 3b to 3d each have a locking device 8a to 8c. The different phases during threading are identified in FIG. 1 by the numbers 1 to 4.

In phase 1, the continuous casting plant is at the beginning of the

Threading process shown. There are all

Arretiereinrichtungen 8a, 8b, 8c open, the Anfahrstrang 4 is threaded from below into the strand guide segment 3d and by means of drivable and / or anstellbarer

Strand guide rollers 7c, 7d against the

Strangtransportrichtung R moves. In phase 2, the dummy bar 4 already has the

Strand guide segment 3d passes and the locking device 8c has been closed, whereby the Anfahrstrang is secured against falling. Subsequently, the

Anfahrstrang turn by means of drivable and / or

adjustable strand guide rollers 7c, 7d further and secured by means of the locking device 8b in phase 3 and 8a in phase 4.

In phase 4 of the Anfahrstrang has reached the starting position for the casting start, whereby the head of the strand 4 strand mold closes the output side.

In an embodiment not shown, the

Of course, starting line also from above, i. from the casting stage, through the mold into the strand guide (narrow top feeding)

Anfahrstrang usually from a movable on the casting platform Anfahrstrangwagen or a crane through the mold

introduced and locked on a locking device

lowered. Then we the crane from the launching line

suspended, so that any incorrect operation is excluded. Furthermore, the drivable and / or adjustable

Strand guide rollers employed and positioned the start-up strand in the strand guide exactly and the locking device again locked. Also in this embodiment, it is advantageous, depending on the length of the Anfahrstrangs at least one locking device to keep closed during threading and so to secure the Anfahrstrang.

In Fig. 2 is the holding of the starter strand 4 and the

Extracting the Anfahrstrangs 4 shown with the casting 5 from the mold 1. In phase 1, the starting line is held by the drivable and / or engageable strand guide rollers and secured by the locking device 8a. After the start of casting, the locking device 8a is released, i. unlocked, and the Anfahrstrang 4 with the

forming cast strand 5 from the mold 1 in

Strangförderrichtung R pulled out. For this purpose, the locking devices 8a to 8c of each other in

Series sequential strand guide segments 3b, 3c, 3d sequentially unlocked, whereby the start-up and casting strand are secured even when undressing. In Fig. 3, a strand guide segment 3 a strand guide a vertical caster is shown. The

Strand guide segment consists essentially of a

Support frame 12, the outside and inside

Strand guide rollers 7a, 7b, and the locking device 8, one on the upper end face 9 of the

Strand guiding segment 3 displaceable performed plate 9 and one, designed as a pressure cylinder,

Actuator 11 includes. The outer, arranged in the strand transport direction R below,

Strand guide roller 7c is drivable

Strand guide roller executed. Those also below

arranged, but internal strand guide roller 7d is designed as a, by means of an adjusting device 13 designed as a hydraulic cylinder, as engageable strand guide roller. As a result, the strand guide rollers 7b, 7d in the support frame 12 are designed to be movable relative to the strand guide rollers 7a, 7c, whereby it is possible to adjust to the starting or casting strand or to reduce the thickness of the cast strand. When securing the Anfahrstrang the plate 10 is the Arretiereinrichtung 8 by means of the actuator 11 from an outside of the transport path 6 lying

Release position in a transport path blocking

Suspended position. The pressure cylinder of the actuator works against a -

Starting position of the plate over the transport path 6

Defining position - spring, not shown, so that the plate in case of failure of a hydraulic, electrical or

Communication device automatically in the

Starting position, i. over the transport route 6, is moved.

FIG. 4 shows a schematic representation of the insertion of a starter strand 4 into a strand guide 2 formed from a drive pulley frame. In phase 1 is the - threaded either from above by means of a crane through the mold 1 in the strand guide 2 (Engl, top feeding), or from below by means of engagable and driven

Strand guide rollers 7c, 7d introduced dummy bar 4 on the locked, designed as a bolt, locking device 8c on. In phase 2, the engageable and drivable strand guide rollers 7c, 7d employed, possibly suspended the crane, the locking device 8c unlocked and the Anfahrstrang 4 accurately positioned. In phase 3, the

Anfahrstrang the target position, cf. reached the start position above, and executed as a bolt locking device 8c is by means of a non-illustrated

Actuator displaced in a slot of the Anfahrstrangs. In phase 4, therefore, is the starting line

fully secured in the starting position.

In Fig. 5 is a part of the strand guide a

Vertical continuous casting plant shown. It is the

threaded starter strand 4 held by engageable and drivable strand guide rollers 7c, 7d and - as soon as the

Anfahrstrang has reached the starting position - of a trained as a bolt deterrent 8 in

Cassette construction secured. The actuator for the locking device 8 is as hydraulic Pressure medium cylinder executed, whereby the Anfahrstrang is automatically secured by the area ratio of the pressure medium cylinder in conjunction with a hydraulic pressure accumulator, not shown. By the execution of

Locking device in cassette construction is also a quick assembly and disassembly possible.

LIST OF REFERENCE NUMBERS

I mold

2 strand guide

3, 3a ... 3d strand guide segment

4 starting line

5 cast strand

6 transport route

7a, 7b strand guiding role

Ic drivable strand guide roller

7d adjustable strand guide roller

8a ... 8c locking device

9 end face of the strand guide segment

10 plate

II actuating device

12 supporting frame of the strand guide segment

13 adjustment devices on the strand guide segment R strand transport direction

Claims

claims

A method of securing a starter string (4) in a plurality of strand guide rolls (7a, 7b)

Strand guide (2) of a continuous casting plant, wherein

the starter line {4) when threading drivable

Ξtrangführungsrollen transported (7c);

the strand of stranding (4) is held in a starting position of adjoining strand guide rollers (7d) which closes a mold (1) on the outlet side before the start of pouring; and the dummy bar (4) and a cast strand (5), which forms after casting, of drivable

Strand guide rollers (7c) is pulled out;

characterized,

- that the Anfahrstrangs (4) when threading and holding at least one, in Ξtrangförderrichtung (R)

downstream, locking means (8, 8a, 8b, 8c) is secured; and

- that the securing and unlocking of the dummy bar (4)

by means of the locking device (8, 8a, 8b, 8c) by closing and releasing one of the

Ξtrangführungsrollen (7a, 7b, 7c, 7d) formed

Transport path (6) takes place.

2. The method according to claim 1, characterized in that a plurality of locking devices (8, 8a, 8b, 8c) in the

Ξtrangführung (2) are distributed, which when threading the starter strand (4) secured sequentially and after the

Casting start are sequentially unlocked.

3. The method according to any one of the preceding claims, characterized in that a locking device (8, 8a, 8b, 8c) automatically in a failure of a device of electrical, hydraulic, pneumatic or communication secures the Anfahrstrang (4).

4. The method according to any one of the preceding claims, characterized in that in a sudden loosening and

Crashing of the starter line (4), the starter line of at least one locking device (8, 8a, 8b, 8c) downstream in the strand conveying direction (R) is intercepted and prevented from further downward movement.

5. continuous casting with a mold (1) and a in

Strangförderrichtung following, several

Strand guide rollers (7a, 7b) comprising, strand guide (2), and with a starter strand (4), the mold (1) at

Gießbeginn the output side closes and in the

Strand guide (2) of drivable and engageable

Strand guide rollers (7c, 7d) can be held and moved, wherein the strand guide rollers (7a, 7b) a

Forming transport path (6) for the starter line (4), characterized in that in the strand guide (2) at least one locking device (8, 8a, 8b, 8c) for the Anfahrstrang (4) is arranged, from one outside the transport path (6) lying release position in a transport path (6) of the Anfahrstrangs (4) blocking the collection position is formed displaced back and forth.

6, continuous casting plant according to claim 5, characterized in that the continuous casting is designed as a vertical continuous casting.

7. Continuous casting plant according to claim 5, characterized in that the continuous casting as Bogenstranggießanlage

is trained.

8. Continuous casting plant according to one of claims 5 to 7, characterized in that a locking device (8, 8a, 8b, 8c) on an end face (9) of a strand guide segment (3, 3a, 3b, 3c) or a drive roller frame or between two, in Ξtrangförderrichtung (R) adjacent, strand guide rollers (7a, 7b) is arranged.

9. Continuous casting plant according to one of claims 5 to 8, characterized in that a locking device (8, 8a, 8b, 8c) is arranged in a separate support structure.

10. Continuous casting plant according to one of claims 5 to 9,

characterized in that a locking device (8, 8a, 8b, 8c) is designed as a displaceable or pivotable bolt, wherein the bolt of a

Actuating device (11) is designed to be displaceable.

11. Continuous casting plant according to one of claims 5 to 10, characterized in that a locking device (8, 8a, 8b, 8c) is designed as a displaceable, slanted plate (10) or a displaceable, obliquely lying bolt, wherein the weight of the Arretiereinrichtung the

Basic position of the locking device (8, 8a, 8b, 8c) defined and the locking device via a

Actuator (11) in the release position

is relocatable.

12. Continuous casting plant according to one of claims 5 to 11, characterized in that the actuating device (11) comprises a pressure accumulator, wherein the pressure accumulator formed by means of a pressure medium cylinder

Actuating device (11) the basic position of

Locking device (8, 8a, 8b, 8c) defined.

13. Continuous casting plant according to one of claims 5 to 11,

characterized in that the actuating device (11) comprises a spring, wherein the spring force defines the basic position of the locking device (8, 8a, 8b, 8c).

14. Continuous casting plant according to one of claims 5 to 13, characterized in that the dummy bar (4) has a transverse to the

Transport path (6) lying Äusnehmung, preferably a

Slot or a U-shaped recess, and the Anfahrstrang (4) on the, engaging in the recess, displaceable bolt is secured.

15. Ξtranggießanlage according to any one of claims 5 to 14,

characterized in that a locking device (8, 8a, 8b, 8c) as a displaceable or pivotable plate (10) is formed, wherein the plate of an actuating device (11) is designed to be displaceable.