EP0017645B1 - Installation for extracting and introducing a starter bar in a continuous casting plant - Google Patents

Description

The invention relates to a device for pulling out and introducing a flexible starting strand provided with a starting head according to the preamble of claim 1 (DE-A-2714338).

In the known generic device, the cage is rotatably supported in an end region, which means that a relatively large amount of space is required for the rotary movement and the drive must be very large, since when the cage is rotated, the starting strand located in the cage is raised by approximately the amount of its length . Since the start-up strand in the known device is inserted by means of the straightening device for the warm strand into the cage arranged after the straightening device; Difficulties may arise when rotating the cage, since it is not possible with the straightening device to fully insert the starting strand into the cage.

AT-PS 343 835 also discloses a device for introducing a flexible starting strand provided with a starting head into a continuous casting installation, the starting strand being threaded into the strand guide from above through the mold “foot ahead”. This known device comprises a lifting device for The transport trolley is transported from the pick-up position to the inlet part of the strand guide and the foot part is lowered over an arcuate end part of the transport trolley.

Furthermore, according to DE-PS 1 210140, a receiving and feeding device for the starting strand of a continuous casting installation is known, in which a roller conveyor branching off the strand guide is pivotably arranged above the strand guide, in such a way that its lower end acts as a switch.

The two known devices described last have certain disadvantages. In the case of the device according to AT-PS 343 835, the use of a separate transport carriage with rails is associated with a relatively high level of design effort and requires additional space; In the device according to DE-PS 1 210140, the introduction of the "foot forward" starting strand through the mold is not possible, but in this device the starting strand has to be moved back to the mold through the "head forward" strand guide, which takes up a considerable amount of time and therefore considerable set-up or downtimes required.

The invention aims to avoid these disadvantages and difficulties and has the task of creating a device of the type described, the space requirement is as small as possible and the cage allows a perfect reception of the starting line, the drive for rotating the cage with the least possible power can be interpreted.

To solve this problem, the characterizing features of claim 1 are proposed.

In order to keep the skid-shaped switch as small as possible and thus easily movable and space-saving, a fixed arc-shaped slide or roller track is provided between the skid-shaped switch and the cage.

The stationary track expediently contains at least one pair of drive rollers of a drive roller stand, as a result of which the hall crane is not required for pulling the starting strand out of the strand guide and is kept free for other work.

According to an expedient embodiment, the cage can be transported from the receiving position into the threading position “foot ahead” by means of transport devices, such as an indoor crane.

The device according to the invention is explained in more detail with reference to the drawing using an exemplary embodiment, wherein FIG. 1 shows an overall view of a continuous casting installation in connection with the device according to the invention in a schematic representation in a side view. Fig. 2 shows a view in the direction of arrow 11 of FIG. 1, but with the cage pivoted through 180 °.

In Fig. 1, 1 is a continuous mold, to which the strand guide connects downward. 2 is the bending zone of the strand guide, in which the cast strand is bent from the vertical into a circular arc. In the circular-arch-shaped guide frame 3 adjoining the bending zone, the support and guide rollers 4 are mounted in segments 5 which can be removed and installed individually. The start-up line must be introduced into the line guide from above through the mold 1 so far that the first of the drivable rollers 6 grip it and convey it downward. With 7 the straightening zone of the strand guide is designated, in which the cast strand bent in a circular arc is straightened. 8 is a horizontal strand guide. Drive rollers 9 are provided between the straightening zone 7 and the horizontal strand guide frame 8. At the end of the horizontal guide section there are further drive rollers 10. Connected to this is the flame cutting roller table 11, on which a flame cutting device (not shown) is provided which separates the cast strand into the desired lengths and which is also used to cut off the top ends.

At the beginning of the flame cutting roller table, a switch 12 designed in the manner of a skid is arranged so that it can pivot from a position A shown in full lines in FIG. 1 to position B shown in broken lines in FIG. 1 about a fixed axis 13. A pressure medium cylinder 14 is used for pivoting.

As can be seen from FIG. 1, a fixed roller conveyor 16, which is mounted on a support frame 15, adjoins the swiveled switch 12 (position B). At the upper end of this fixed roller conveyor 16, a cage 18, also containing a roller conveyor 17, is provided in the extension thereof, which is rotatably mounted on the support frame 16 about the axis designated 19. The drive motor 20 shown in FIG. 2, to which a gear 21 is connected, is used to rotate the cage 18. At the two ends 22, 23 of the cage, clamping rollers 24 are provided, which serve to clamp the starting strand 26, which consists of articulated link bodies 25. For conveying the starting strand 26 when it is being conveyed out by the last drive rollers 10 arranged in front of the flame cutting roller table, drive roller pairs of drive roller stands 27, 27 'are used, one of which 27' is provided on the stationary roller conveyor 16 and one 27 is approximately in the middle of the cage 18 .

At the very beginning of the flame cutting roller table there is a pincer opening mechanism 28 with which a pincer-shaped starting head 29 of the starting strand can be opened. In the casting hall, a hall crane 31, which is designed as a portal crane, can be moved on supports 30.

• Zu Giessbeginn wird der mit seinem Anfahrkopf 29 am Kranhaken 32 des Hallenkrans 31 hängende Anfahrstrang 26 «Fuss voran» (der Fuss ist mit 33 bezeichnet) durch die Kokille 1 hindurch in die Strangführung eingefädelt, bis der Anfahrkopf die Kokille nach unten zu abschliesst. Dieser Vorgang ist in Fig. 1 mit strichlierten Linien veranschaulicht. Nach Giessbeginn wird der Anfahrstrang mittels der angetriebenen Stützrollen 6 und mit ihm der Gussstrang ausgezogen. Sobald der Fuss 33 des Anfahrstranges von den Treibrollen 10 erfasst ist, wird die kufenförmige Weiche 13 in die in Fig. 1 strichliert dargestellte Position B geschwenkt, so dass der Anfahrstrang über die Weiche der ortsfesten, bogenförmigen Rollenbahn 16 zugeleitet wird. Sobald der Anfahrkopf 29 unter den Zangenöffnungsmechanismus 28 zu liegen kommt, werden die Zangenhälften des Anfahrkopfes aufgeklappt und der so vom Gussstrang getrennte Anfahrstrang mittels des Treibrollengerüstes 27', das an der ortsfesten Rollenbahn 16 vorgesehen ist, weiter in die Höhe gefördert. Wenn der Kopf 29 des Anfahrstranges an der ortsfesten Rollenbahn zu liegen kommt, wird die Weiche 12 wieder nach unten in die Position A geklappt, so dass die Weiche dem weiter ausgeförderten Gussstrang nicht hinderlich ist. Der Anfahrstrang wird sodann weiter in die Höhe gefördert, bis er zur Gänze in Käfig 18 zu liegen kommt. Dies ist in Fig. 1 mit voll ausgezogenen Linien dargestellt. Der Anfahrkopf 29 und der Fuss 33 des Anfahrstranges sind von den Klemmwalzen 24, der mittlere Teil von den Treibrollen des Treibrollengerüstes 27 gehalten.

The function of the device according to the invention is as follows:

• At the start of casting, the start-up strand 26 "foot forward" (the foot is designated 33) with its start-up head 29 hanging on the crane hook 32 of the overhead crane 31 is threaded through the mold 1 into the strand guide until the start-up head closes the mold down. This process is illustrated in Fig. 1 with dashed lines. After the start of casting, the starting strand is pulled out by means of the driven support rollers 6 and with it the cast strand. As soon as the foot 33 of the start-up line is gripped by the drive rollers 10, the skid-shaped switch 13 is pivoted into the position B shown in dashed lines in FIG. 1, so that the start-up line is fed via the switch to the fixed, curved roller conveyor 16. As soon as the start-up head 29 comes to rest under the pincer opening mechanism 28, the pliers halves of the start-up head are opened up and the start-up line thus separated from the cast strand is conveyed further upwards by means of the drive roller stand 27 'which is provided on the stationary roller conveyor 16. When the head 29 of the start-up strand comes to rest on the stationary roller conveyor, the switch 12 is folded down again into position A, so that the switch does not hinder the cast strand which is conveyed further. The start-up line is then conveyed upwards until it comes to rest entirely in cage 18. This is shown in Fig. 1 with full lines. The start head 29 and the foot 33 of the start strand are held by the pinch rollers 24, the middle part by the drive rollers of the drive roller stand 27.

If you now want to thread the start-up line again into the mold, the cage 18 is first pivoted through 180 °, so that the start-up line, which initially protrudes with its foot 33, now projects upwards with its start-up head 29 (FIG. 2). The start head 29 is then gripped by the crane hook 32 of the hall crane and the start line, as shown in FIG. 2 with dash-dotted lines, is pulled out of the cage, whereupon the hall crane 31 moves over the mold 1, as shown with dashed lines in FIG. 1 is.

The invention is not limited to the exemplary embodiment shown, but can be modified in various ways.

For example, it is possible to dispense with the fixed, curved roller conveyor if the switch, which is designed like a skid, bends the starting strand by approximately 90 °. The cage can be connected directly to the switch. Furthermore, it is possible to replace the roller tracks for the starting strand shown in the figures by slideways. The cage itself can be pivoted back and forth by 180 °, as indicated by the arrows 34, or rotated by 360 °. The axis of rotation 19 of the cage need not, as shown in FIG. 1, be arranged exactly in the middle and parallel to a roller of the roller conveyor of the cage, but it can also be located eccentrically of the cage, as a result of which the cage is in one position (for receiving the starting strand) its end 22 comes to lie below the casting platform 35 and, in the other position, pivoted through 180 ° (for the purpose of grasping the starting head by means of the crane hook) comes to rest above the casting platform 35 with its end 23 assigned to the starting head 29. This has the advantage that the starting head 29 is easier to grasp.

A further modification of the device according to the invention can consist in that the cage 18 itself is lifted by the crane and conveyed to the mold 1, wherein the cage can be pivoted in the direction of the mold during the horizontal movement of the cage.

The cage itself does not have to be vertical, as shown in Fig. 1, for receiving the start-up line, but it can also be arranged at an incline, so that when the cage is pivoted (for the purpose of “pointing upwards” of the start-up head), the swivel angle deviates from 180 ° surrender.

According to a further modified embodiment, the mold and possibly also a strand guide part below it can be removed before the start-up strand is threaded into the strand guide and drawn in. A part of the strand guide can also be designed to be openable in order to release a threading opening.

Claims (4)

1. Arrangement for extracting and introducing a flexible starter bar (26) provided with a starter bar head (29) out of and into the arcuate strand guide (2, 3, 7) of a continuous casting plant, comprising a cage (18) rotatable about a horizontal axis by approximately 180° and accommodating the starter bar, and a lifting and transporting means (31, 32) for introducing the foot end (33) of the starter bar Into the mould (1) or into an opening of the strand guide below the mould, and a starter bar guide (12, 16, 17) branching off the strand guide, characterised in that the starter bar guide includes a rocker-shaped shunt (12), and that at least one driving roll pair of a driving roll stand (27) is arranged in the cage (18) for the starter bar and the cage is rotatable about an axis (19) that is arranged on the supporting structure (15) approximately in the middle between the two ends (22, 23) of the cage.

2. Arrangement according to claim 1, characterised in that a stationary arcuate slide or roller way (16) is provided between the rocker-shaped shunt (12) and the cage (18).

3. Arrangement according to claim 2, characterised in that the stationary way (16) contains at least one driving roll pair of a driving roll stand (27').

4. Arrangement according to claims 1 to 3, characterised in that the cage (18) is transportable from the accommodation position into the thread- in position «foot first» by transporting means, such as a hall crane (31).

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