DE102010062853A1 - Method and apparatus for continuous casting of a metal strand - Google Patents

Abstract

The invention relates to a method and a device for the continuous casting of a metal strand. This uses a flexible cold strand, which can be inserted from above into a mold and has a start-up head at its end remote from the leading cold strand end, and a cold strand wagon arranged on a casting platform, onto which the cold strand is pulled after decoupling from the warm strand, the cold strand wagon doing this leading cold strand end on a loading side and moved by an endless chain running on sprockets for the next sprue to an unloading side in the direction of the mold. In such a method and a device, in particular, easy handling of a long cold strand in a circular arc casting day should be made possible. For this purpose, the cold strand picked up on the loading side is diverted by means of the endless chain on the unloading side from an upper track of the cold strand car to a lower track on which the cold strand with its leading cold strand end is led back towards the loading side until the entire cold strand is wound up by Cold-strand car is picked up and the leading cold-strand end assumes an initial transport position facing the loading side.

Description

The invention relates to a method for the continuous casting of a metal strand, in which a flexible, to be introduced from above into a mold at its end from the leading cold end remote end of a dummy head having Kaltstrang is used, which after decoupling from the hot strand to a located on a casting platform Kaltstrangwagen is pulled, wherein the cold extruder carriage receives the leading cold strand end on a loading side and moves the cold strand by means of a sprocket wheels, of which at least one is driven, circulating endless chain for the next sprue to a discharge side in the direction of the mold.

Furthermore, the invention relates to a device for continuous casting, in particular for carrying out the method.

A flexible, mostly formed of chain links dummy strand is used to start a continuous casting process in a continuous casting, which closes the mold at its output with his Anfahrkopf to bring the melt in a first filling process in the mold can. After a first solidification of the melt, the forming hot strand is drawn from the strand guide of the continuous casting by means of the cold strand of the mold and then separated from the cold strand.

After the decoupling of the hot strand with its leading cold strand end, the cold strand is again conveyed back to the mold in order to be available for the next starting process or casting.

In so-called "top feeding", the cold strand is circulated through the continuous casting plant, i. H. he is pulled by a horizontal roller table up to the level of the casting platform, for example by means of a hall crane, and there placed on a cold extruder truck, which then transported him back towards the mold.

Such, on the casting platform in the longitudinal direction movable Kaltstrangwagen is for example by the DE 32 12 815 A1 known.

The cold extruder truck has a loading side for receiving the cold strand drawn on the casting platform and a discharge side for introducing the cold strand from above into the mold. The transport of the cold strand in the longitudinal direction between the loading and unloading takes over an endless chain, which is driven by a front and a rear sprocket.

The endless chain is equipped with two gripper claws for engaging, taking away and dispensing the dummy strand. The two gripper jaws are arranged at a distance from each other on the endless chain so that they engage in successive times in the loading side in mounted near the leading cold end and the Anfahrkopfes seats.

Further, a support plane is provided on the upper side of the cold runner to support the dummy bar during its transfer from the loading to the discharge side.

The length of the cold runway car, which is used for transport and storage of the dummy bar on the top of the cold runway car, must therefore be at least sized so that the complete dummy bar can be accommodated on top of the car.

This leads in particular in circular arc casters, which are operated with the above-mentioned "top feeding" of the dummy bar and longer length of the dummy bar in combination with a small circular arc of the strand guide to spatial problems on the casting platform.

The invention is therefore an object of the invention to provide a method and an apparatus of the type mentioned without the disadvantages described that or in particular allows easy, easy handling of a long dummy bar in a circular arc caster.

This object is achieved by a method according to the invention in that the recorded on the loading side cold strand is deflected by the endless chain on the discharge side of an upper race of the cold runner on a lower track on which the cold strand with its leading cold strand end so far in the direction of the loading side is supplied until the entire cold strand is taken up wound up by the cold extruder carriage and the leading cold strand end occupies a loading transport side facing the output transport position. Due to the circulating driving style, d. H. Winding of the entire dummy bar on the cold extruder truck and thus achieved double-sided or -lagige storage of the dummy bar, the length of the cold runner can be compared to the previous design or length of a known cold runner car roughly halve.

The achieved by the circulation function with two-ply winding of the dummy bar compact design of the cold runway car allows its spatial placement on a casting platform of a circular arc caster with a small circular arc of the strand guide and a long dummy strand. The cold extruded carriage can be moved freely along the casting platform in the longitudinal direction with the long cold strand mounted on its upper and lower tracks. This is advantageously achieved that, despite the small arc of the strand guide of the cold extruder carriage can be positioned to transfer the cold strand on the discharge exactly in relation to the strand guide, far the cold extruded carriage requires no bulky, bulky dimensions.

In order to transport the cold strand into the position required for the next sprue onto the cold extrudate, the cold strand is unwound according to the invention by deflecting the leading cold strand from its initial transport position or waiting position on the lower track from the endless chain on the loading side to the upper track and the discharge side supplied. From there, the dummy bar can then be lowered until the trailing arrival head has reached its operating position.

A device according to the invention, in particular for carrying out the method according to claim 1, provides that also on the underside of the cold runway carriage a career supporting the cold strand is formed. The lower raceway is arranged at some distance from the bottom and the endless belt of the continuous extruder truck, so that sufficient space for receiving the dummy bar is provided during its winding.

The lower track thus allows the double-sided storage of the dummy bar on or on the cold extrudate. Both the upper and the lower track, advantageously arranged in each case between the front and the rear sprocket of the endless chain, is preferably designed as a roller conveyor, which favors easy and low-friction transport of the heavy cold strand.

A preferred embodiment of the invention provides that the lower raceway are assigned both in the region of the loading side and the discharge side adjustable, extending to the top of the cold runway baffles. The taken on the loading side of the cold runner and transported on the upper run or roller conveyor leading Kaltstrangende with the dummy bar is redirected by the provided on the discharge side baffle down to the lower runway or roller conveyor, the leading end of cold strand with the dummy bar on the lower runway or roller conveyor is returned so far in the direction of the loading side, until the trailing arrival head rests completely on the upper run or roller conveyor.

In order to transport the leading cold strand end and, consequently, the entire cold strand from this resting waiting position in the direction of the strand guide located on the discharge side, the leading cold strand end is redirected by the deflection plate assigned to the loading side to the upper run or roller track and resting thereon on the discharge side fed.

For trouble-free and low-friction deflection, the baffles on their insides on planar sliding surfaces, which lie in the transition region to the rollers of the lower roller conveyor at a height level with the roller crests.

According to a further embodiment of the invention it is provided that the endless chain is formed with hook-shaped retaining elements for engagement in the limb-like dummy strand. Preferably, two hook-shaped holding elements are provided at a defined distance from each other on the endless chain, so that they can intervene in successive times in the loading side of the cold runner in corresponding openings between the chain links of the dummy bar on the one hand in the vicinity of the leading cold ends and the other of the rear approach head ,

Both the engagement of the hook-shaped holding elements in the limb-like cold strand, as well as the release from this engagement for the transfer of the cold strand in the strand guide of the mold takes place here automatically.

Further details and features of the invention will become apparent from the claims and the following description of an embodiment of the invention shown in the single figure.

The figure shows for a continuous casting plant, in particular for a circular arc caster with a small circular arc of the strand guide and a long cold strand, a cold extrudate 1 that has drivable wheels 2 . 3 on a casting platform shown in dashed lines 4 is movable.

The Kaltstrangwagen 1 has a loading side 5 , via which a flexible, limb-like cold strand 6 in the manner described in more detail below on the car 1 is charged, as well as an opposite discharge side 7 at which the dummy strand 6 unloaded and via an insertion aid 8th for forwarding in a mold, not shown, with this subsequent strand guide is passed.

For transporting the cold leg 6 , the leading end 9 and remove a pickup head from it 10 For closing the mold on the output side, one is here only schematically indicated endless chain 11 provided by on the discharge side 7 and the loading side 5 arranged sprockets 12 . 13 guided and driven by these. The two sprockets 12 . 13 are the encircling endless chain 11 in this area enclosing fenders 14a . 14b assigned.

The endless chain 11 is with two spaced, hook-shaped holding elements 15a . 15b Mistake. The hook-shaped holding elements 15a . 15b grab the cold strand 6 on, on the one hand at the loading side 5 on the Kaltstrangwagen 1 on the other hand, on the unloading side 7 to unload and over the Einführhilfe 8th to pass to the strand leadership.

Both on the top 16 as well as the bottom 17 the cold runway car 1 is in each case a roller conveyor 18 . 19 to support the cold strand 6 educated. The lower roller conveyor 19 is at the front and at the rear end, ie at the unloading side 7 and at the loading side 5 , one baffle each 20 . 21 assigned.

The leading cold string end 9 which, for example, from a crane to the level of the casting platform 4 has been pulled into a car transfer position A, is by means of the hook-shaped holding elements 15a . 15b at the loading side 5 grabbed on the upper roller conveyor 18 moved and resting on this towards the discharge side 7 transported. At the unloading side 7 becomes the leading cold string end 9 over the baffle 20 forcibly guided to the lower roller conveyor 19 diverted and supported by this towards the loading side 5 returned until the entire cold strand 6 wound up and from the extruder truck 1 is included. In doing so, the leading cold string end decreases 9 the output transport position B1 on the lower roller conveyor 19 and the startup head 10 the output transport position B2 on the upper roller conveyor 18 one. By thus double-sided storage of the complete dummy strand 6 on the cold rod truck 1 this does not need to be increased in size despite a long dummy bar is free on the casting floor 4 movable and can freely in an exact position in relation to the strand guide to the transition of the dummy bar 6 to be moved.

To the cold strand 6 In a transfer position necessary for the next sprue to transport the strand guide becomes the leading cold strand end 9 from the above-described, stationary, double-layer wound position of the dummy bar 6 by means of the then driven endless chain 11 and the hook-shaped holding elements 15a . 15b from the output transport position B1, forcibly guided by the deflecting plate 21 , on the upper roller conveyor 18 diverted and lying on this up to before or in the insertion 8th emotional. The leading cold string end 9 is located in the strand guide transition position C1, while the trailing head 10 , over the baffle 20 on the lower roller conveyor 19 diverted, then took the position C2. Subsequently, in preparation for the casting start, the leading, approximately conically tapering cold strand passes through 9 with the dummy strand 6 the mold and the subsequent strand guide until the approach head 10 the mold closes on the output side.

LIST OF REFERENCE NUMBERS

1

Dummy bar car

2

wheel

3

wheel

4

casting platform

5

loading side

6

dummy bar

7

unloading

8th

insertion

9

leading cold string end

10

Approach head dummy strand

11

endless chain

12

Sprocket

13

Sprocket

14a, 14b

mudguard

15a, 15b

hook-shaped holding element

16

Top of the extruder

17

Underside of the cold extruded cart

18

upper roller conveyor

19

lower roller conveyor

20

Deflector discharge side

21

Deflector loading side

A

Carriage position leading cold strand end

B1

Initial transport position leading cold strand end

B2

Starting transport position approach head

C1

Strand guide transfer position leading cold strand end

C2

Strand guide transfer position approach head

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 3212815 A1 [0006]

Claims (6)

A method of continuously casting a strand of metal using a flexible dummy bar having a dummy head to be inserted from above into a mold at its leading end from the leading cold run and pulled after decoupling from the hot run to a cold run cart located on a casting platform, wherein the cold extruder carriage picks up the leading cold strand end on a loading side and moves the cold strand by means of a chain on wheels, at least one of which is driven drivable, endless endless chain for the next sprue to a discharge side in the direction of the mold, characterized in that on the loading side ( 5 ) received cold strand ( 6 ) by means of the endless chain ( 11 ) on the unloading side ( 7 ) from an upper career ( 18 ) of the cold runway car ( 1 ) on a lower track ( 19 ) is deflected, on which the cold strand ( 6 ) with its leading cold strand end ( 9 ) so far towards the loading side ( 5 ) is returned until the entire cold strand ( 6 ) wound up by the cold extruder truck ( 1 ) and the leading cold end ( 9 ) one of the loading side ( 5 ) facing the output transport position (B1) occupies. A method according to claim 1, characterized in that for the next sprue of the cold strand ( 6 ) is handled by the leading cold end ( 9 ) from its starting transport position (B1) from the endless chain ( 11 ) on the loading side ( 5 ) to the upper raceway ( 18 ) and the unloading side ( 7 ) is supplied. Apparatus for continuously casting a metal strand, comprising a flexible cold strand to be introduced from above into a mold, at its leading end from the leading cold strand end, and a cold runner located on a casting platform onto which the cold strand is drawn after decoupling from the hot strand , wherein the cold extruder carriage receives the leading cold strand end on a loading side and moves the cold strand by means of a sprocket wheels, of which at least one is drivable, circulating endless chain on a track of the top of the cold runway carriage to a discharge side in the direction of the mold, in particular for performing the method according to Claim 1, characterized in that also at the bottom ( 17 ) of the cold runway car ( 1 ) one the cold strand ( 6 ) supporting leading career ( 19 ) is trained. Device according to claim 3, characterized in that the lower raceway ( 19 ) both in the area of the loading and unloading side ( 5 . 7 ) adjustable to the top ( 16 ) of the cold runway car ( 1 ) extending baffles ( 20 . 21 ) assigned. Device according to claim 3 or 4, characterized in that the endless chain ( 11 ) with hook-shaped holding elements ( 15a . 15b ) for engaging in the limb-like cold strand ( 6 ) is trained. Device according to one of claims 3 to 5, characterized in that the raceways as roller conveyors ( 18 . 19 ) are formed.

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