EP2285512B1 - Multi-strand continuous casting system - Google Patents

Description

Technical area

The invention relates to a multi-strand continuous casting for the production of metal strands with billet or billet cross section with a strand guide comprising a directional zone equipped with Treibrichtaggregaten, wherein a plurality of strand delivery in succession arranged Treibrichtaggregate in a common scaffold with comb-like stands in receiving openings formed between the uprights are arranged and each Treibrichtaggregat a pair of rollers with an outer-bow roller and a relative movable inner-bow roller in associated roller carriage and a adjusting device for one of the two rollers, and optionally a rotary drive for one of the rollers comprises.

Attenuation units are used in single- or multi-strand continuous casting plants, in particular continuous casting plants for the production of steel strands with different strand cross-section formats, to bend straight an arcuate strand guiding zone, continuously solidifying metal strand in the transition region to the horizontal outlet roller table straight and by a defined with respect to the pullout speed uniform transport to ensure the strand guidance. Greatering units can also be used to carry out a so-called soft reduction, whereby an improvement of the microstructure is achieved by this strand deformation in the final solidification region just before the sump tip.

State of the art

Drive rectifying units usually comprise a pair of rollers, which is supported in a scaffolding frame. A role of the pair of rollers, preferably the role of the bow inner roller stand is adapted to adapt to changing strand thickness in the frame relative to the other role and is pressed by a hydraulic adjusting cylinder to the strand. This role is mostly with one Rotary drive connected. Several of these propulsion units are mounted one behind the other in the strand conveying direction on a common support frame and form the straightening zone in the continuous casting plant. A continuous casting plant with individual drive-straightening units in this arrangement is known from WO 031070399 A1 , of the DE 10 2004 057 427 A1 or the DE 22 39 966 A1 already known.

Treibrichtaggregate the generic type, however, are designed for the joint straightening several steel strands with billet or billet cross-section promoted side by side, are from the DE 30 34 444 A1 already known. A plurality of drive-straightening units, each formed by a pair of rollers, are arranged in a common support frame. This support frame has bow inside open chambers in which the rollers of the drive unit are mounted with their chocks. The chocks or bearing housing of the adjustable rollers are hinged to hydraulic cylinders, which in turn are supported on the support frame. When changing the drive unit, there is a high assembly cost, since it is necessary to release the hydraulic cylinder from its anchorage in the support frame and also to solve the corresponding supply lines, such as pressure medium connections.

From the DE 27 31 748 A1 is also a straightening roller stand known in which a plurality of successive pairs of rollers are arranged in comb-like arranged guides a machine stand. The individual rollers are supported by bearing housings on a cross member, which cooperates with the comb-like guides. Each cross member is adjustable by two pressure medium cylinder to the cast strand. Also in this case, it is necessary for disassembly of the drive unit to release the cross member of the pressure cylinders, the pressure medium cylinder can remain in the system.

From the EP 0 767 012 A2 is a precision rolling stand with a roll housing known in which two rollers are rotatable with their chocks and mounted adjustable by means of a adjusting device against each other. The roll housing has an open frame and a frame closing crosshead, wherein the chock of the roller to be set is connected via the adjusting device with the crosshead.

Presentation of the invention

Object of the present invention is therefore to avoid the disadvantages of the prior art and to propose a multi-strand continuous casting with a straightening zone, which is characterized by low maintenance requirements, as well as easy assembly and disassembly at a case necessary role change.

This object is achieved on the basis of a multi-strand continuous casting of the type mentioned in that each drive assembly comprises a crosshead, which is releasably connected to the receiving opening for the Treibrichtaggregat forming stanchers that hinged to the crosshead the adjusting device for the engageable inner-bow roller in that each roller of the pair of rollers is supported in a roller carriage and the roller carriage of the inner roller is slidably guided on guides of the uprights that the roller carriage of the inner-bow roller is connected to the adjusting device, and that the roller carriage of the outer-bow roller and the roller carriage Inner bow roller are hinged to the crosshead, wherein the roller carriage of the inner bow roller is articulated distance variable to the roller carriage of the outer bow roller on the crosshead. Due to this particular configuration of the individual components of the propulsion unit, it is possible to remove or reinsert the entire propulsion unit with the release of a few fastening elements as a modular component, in particular also with the adjusting device for the driven inner arc roller, from the support framework common to several propulsion aggregates.

The roller carriage of the outer-bow roller and the roller carriage of the inner-bow roller are articulated on the crosshead, wherein the roller carriage of the inner-bow roller is articulated in a distance-variable manner to the roller carriage of the outer bow roller. This articulation is preferably carried out with support tabs, which allow a relative movement of the two roller carriages to each other. Thus, the joint installation and removal is easily possible and it can be compensated structural deviations on the skeleton and especially on the scaffold of the propulsion unit. It is thus achieved that on the one hand fixed the crosshead to the uprights and on the other hand, the roller carriage of the outer arch roller can be supported and secured in the ground area on support brackets in the receiving opening of the scaffold formed by the uprights. The outer bow rollers form here, as in the entire strand guide framework, the fixed side of the strand guide on which the cast metal strand is supported on its transport through the continuous casting.

The media supply for the individual Treibrichtaggregate in the straightening zone can be substantially simplified by each scaffold is assigned a media supply system for the supply of arranged in this scaffolding Treibrichtaggregate and the individual Treibrichtaggregate can be coupled by automatic dome devices when inserting the Treibrichtaggregate in the receiving opening with the media supply system. Media supply lines are guided on the scaffolds to the individual Treibrichtaggregaten, which open in the bottom region of the respective receiving opening to support brackets in a coupling half of a multi-coupling. At the roller carriage of the outer bow roller, the further coupling half of the multi-coupling is arranged. When placing the respective roller carriage of the outer bow roller on the support bracket is automatically the Multi-coupling closed for all required media. It can also be arranged several automatic quick couplings for different media next to each other. If necessary, coolant, lubricant, hydraulic oil, electricity, compressed air and other necessary media can be passed through this multi-coupling. In addition, individual media supply lines are routed to the respective components of the propulsion unit.

So that a flat resting of the inner-bow roller on the metal strand is securely ensured and tilting forces are reliably avoided, it is expedient that the adjusting device centrally acts on a engageable inner-bow roller of the driving direction, is arranged in the direction of the longitudinal extension of the comb-like receiving opening and pivotable on the crosshead or hinged and pivotally or hingedly attached to the roller carriage of the inner-bow roller.

In most cases, the inner-bow rollers are driven in the straightening zone of a continuous casting machine. To ensure a compact design and easy assembly and disassembly of the propulsion unit, it is advantageous if the rotary drive for the inner-bow roller directly on the drive rectifying unit, preferably on the roller carriage of the inner-bow roller, supported and connected via an angular gear with the inner-bow roller. Preferably, the support of the rotary drive via a torque arm. The transmission is preferably designed as an angle gear.

Furthermore, it is expedient if, in a multi-strand continuous casting plant, individual casting strands in the directional zone are assigned to scaffolds which are independent of one another and to independent screeding aggregates. Mutual influences, as they are especially in Treibrichtaggregaten according to DE 30 34 444 A1 can be avoided.

In straightening zones of great length, the straightening zone for each casting strand of the multi-strand continuous casting plant is formed by a plurality of support structures arranged one behind the other.

Especially for the implementation of a soft reduction in the straightening zone and the necessary differentiated setting of a deformation wedge, it is necessary that the adjusting device for the engageable inner-bow roller of each drive rectifying unit is designed individually controllable and adjustable.

As a hitch usually a hydraulically actuated pressure cylinder is used. The adjusting device of this type comprises a pressure cylinder, a control block and a tracking system. The control block is connected by control technology via a data line with the system control device. With the tracking system, e.g. a position transmitter, the engageable inner bow roller is set at the start of casting on the thickness of the dummy bar and the subsequent hot strand. Also, the adjustment of the deformation wedge, i. the gradual roll-to-roll reduction in soft reduction is achieved by activating the setting device in response to the position signal from the track-following system.

For calibration of the tracking system, calibration strips are arranged on the roller carriage of the inner-bow roller and on the roller carriage of the outer-bow roller. The two roller carriages can be moved towards each other until the roller carriage of the inner-bow roller bears against the roller carriages of the outer-bow roller via the calibrating bars. This position determines a reference distance for the strand thickness adjustment to be made.

Brief description of the drawings

Fig.1a

einen Längsschnitt durch eine Richtzone einer Stranggießanlage mit Treibrichtaggregaten gemäß der Erfindung,

Fig. 1b

einen Längsschnitt durch eine Richtzone einer Stranggießanlage mit Treibrichtaggregaten gemäß der Erfindung in einer weiteren Ansicht,

Fig. 2a

einen Querschnitt durch die Richtzone einer Mehrstrang-Stranggießanlage mit Treibrichtaggregaten gemäß der Erfindung entlang der Schnittlinie A-A in Fig. 1 a,

Fig. 2b

einen Querschnitt durch die Richtzone einer Mehrstrang-Stranggießanlage mit Treibrichtaggregaten gemäß der Erfindung entlang der Schnittlinie A-A in Fig. 2a,

Fig. 3

einen Schrägriss eines Treibrichtaggregat gemäß der Erfindung, der wesentliche Bauteile des erfindungsgemäßen Treibrichtaggregates zeigt.

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

1a

a longitudinal section through a straightening zone of a continuous casting plant with drive-straightening units according to the invention,

Fig. 1b

a longitudinal section through a straightening zone of a continuous casting plant with drive-straightening units according to the invention in a further view,

Fig. 2a

a cross section through the straightening zone of a multi-strand continuous casting with Treibrichtaggregaten according to the invention along the section line AA in Fig. 1 a,

Fig. 2b

a cross section through the straightening zone of a multi-strand continuous casting with Treibrichtaggregaten according to the invention along the section line AA in Fig. 2a .

Fig. 3

an oblique view of a drive-straightening unit according to the invention, showing the essential components of the invention Treibrichtaggregates.

Embodiment of the invention

In the FIGS. 1a . 1b and 2a . 2 B is the straightening zone of a six-stranded multi-strand continuous casting in a longitudinal section and a cross section in two representations illustrated schematically. On a plant foundation 1 are on supporting frame 2 a, 2 b, 2 c, 2 d two supporting frameworks 3 a, 3 b releasably secured with clamping screws. The support frame 3a is arcuate and the support frame 3b is straight. Together they form the straightening zone 5 of the continuous casting plant. Together, an arcuate, the straightening zone upstream strand guide continuous steel strand 6 is directed straight in Treibrichtaggregaten 7 and possibly also subjected to a soft-reduction in these scaffolds. How out FIG. 2 it can be seen, each cast strand is assigned an independent support frame 3a, 3b, wherein either one or two of these support structures are supported on a support frame 2d.

The scaffolds 3a, 3b are formed as a frame construction, wherein a series of comb-like uprights 8 protrude from this scaffold and form between them receiving openings 9, are inserted into the individual propulsion units 7. Each four arranged in a square stanchion form such a receiving opening. Each scaffold is designed to receive a plurality of propulsion units arranged one behind the other in the direction of transport of the strand, wherein the scaffold 3a receives three propulsion aggregates 7 and the scaffold 3b receives four propulsion units 7. Each of these Treibrichtaggregate 7 forms a self-contained unit that can be installed or removed as a whole.

The Treibrichtaggregat is shown in more detail in the figure. Each drive rectifying unit has a crosshead 11, which forms a support frame for all components of the drive rectifying unit. The crosshead 11 is releasably secured to four uprising, together a receiving opening 9 limiting stators 8 at the upper ends with connecting bolts 12 or with another fastener. An adjusting device 13, which is formed by a controllable pressure medium cylinder 13 a, is pivotally supported with pivot pin 14 in the crosshead 11. On the piston rod 15 of the pressure medium cylinder 13a, a roller carriage 16 is pivotally connected to a pivot pin 17. At the roller carriage 16, the inner-bow roller 18 is in support bearings rotatably supported. The roller carriage 16 is guided with its guide grooves 19a on radially aligned guides 19, usually on interchangeable guide rails, in the curved support frame 3a in the radial direction and in the horizontal expiring straight support frames 3b in the vertical direction.

Below the roller carriage 16 of the inner-bow roller 18 of the roller carriage 20 of the outer-bow roller 21 is articulated, which can be releasably secured with fastening elements on a bottom plate 23 in the receiving opening 9. In this case, a small relative mobility of the roller carriage 16, 20 is sufficient, which compensates for small differences in distance due to production and avoids assembly-related tension in the drive-bearing unit. For this purpose, support bolts 17 are guided on roller carriage 16 of the inner-bow roller 18 in non-illustrated slots on support plates 26, as well as the roller carriage 20 of the outer-bow roller 21 .. The roller carriage 20 is also radially on the guides 19 of the uprights 8 with guide grooves 19a or vertically guided. The inner-bow roller 18 and the outer-bow roller 21 of a drive-straightening unit form a cooperating pair of rollers.

The adjusting device 13 acts centrally on the engageable inner-bow roller 18 via the roller carriage 16. Specifically, in the formation of the adjusting device as a pressure cylinder 13a this is aligned in the direction of the longitudinal extent of the comb-like receiving opening 9, so that the line of action of the applied force, the axis of rotation of the inner-bow roller 18 intersects (is not shown in detail).

With the adjusting device 13, the roller carriage 16 of the inner-bow roller 18 and the inner-bow roller 18 can be moved relative to the outer-bow roller 21 and thus employed to the continuous casting 6 continuous steel strand with a predetermined or regulated contact pressure, the straightening or ensures a predetermined reduction in thickness (soft reduction or other metallurgical treatment). In order to be able to position the inner-bow roller 18 to a predetermined strand thickness, the adjusting device 13 or the pressure-medium cylinder 13a is assigned a control block 27 and a track-following system 28. As a tracking system, for example, encoders are provided which detect the position of the piston of the pressure medium cylinder. For calibrating this tracking system 28 Kalibrierleisten 30 on the two roller carriages 16, 20 are provided.

To ensure a constant casting strand transport speed and to carry out a soft reduction, the inner-bow rollers 18 of the individual drive-straightening units 7 are predominantly designed as driven rollers. FIG. 1 shows driven inner-bow rollers 18a and non-driven inner-bow rollers 18b. The rotary drive 31 of the driven inner-bow roller 18a, which is formed by an electric motor, is fastened to the crosshead 11 and is connected to the drive shaft of the inner-bow roller 18a via a gear 32 preferably designed as an angular gear.

To supply the individual drive rectifying units with the operating media necessary for the operation, such as cooling water, lubricant, compressed air, hydraulic oil, electricity, control and regulating signals, each support stand 3a, 3b for each strand a common media supply system 33 arranged for all in the respective scaffold Greater 7 assigned. But there are also partial supply systems for special equipment possible. Starting from a common supply line lead branch lines for each medium to a common coupling device 34 on the bottom plate 23 of the respective receiving opening of a drive rectifying unit. A coupling half of this designed as a multi-coupling coupling device 34 is attached to the bottom plate and the second coupling half is attached to the roller carriage 20 of the outer bow roller 21. With the insertion of the roller carriage 20 in the receiving opening 9 and its attachment to the bottom plate 23 all media supply line are coupled together.

FIG. 3 shows the essential components of a Treibrichtaggregates in a Schrägriss, as it can be installed as an assembly of the arcuate or straight scaffold substantially or be removed from this. The registered reference numbers refer to the above description with reference to the FIGS. 1a to 2b ,

List of reference numbers :

1

investment foundation

2a, 2b, 2c, 2d

supporting frame

3a

arched scaffold

3b

straight scaffold

4

turnbuckles

5

straightening zone

6

steel strand

7

Propellant lining unit

8th

comb-like uprights

9

Receiving opening for drive rectifying unit

11

crosshead

12

connecting bolts

13

adjusting equipment

13a

Pressure cylinder

14

pivot pin

15

piston rod

16

Roller carriage of the inner bow rollers

17

pivot pin

18

Inside bow roller

19

guides

19a

guide

20

Roller carriage of the outer bow roller

21

Outside bow roller

23

baseplate

26

carrying strap

27

control block

28

tracking system

30

Kalibrierleiste

31

rotary drive

32

transmission

33

Media supply system

34

coupling device

R

casting

Claims (10)

1. Multi-strand continuous casting installation for the production of metal strands with a billet or bloom cross section, having a strand guide which comprises a straightening zone (5) equipped with straightener withdrawal units (7), wherein a plurality of straightener withdrawal units (7) arranged one behind another in the direction in which the strands are conveyed are arranged in a common support stand (3a, 3b) with comb-like uprights (8) in receiving openings (9) formed between the uprights, and each straightener withdrawal unit comprises a pair of rollers with an outer arc roller (21) and an inner arc roller (18), which is movable in relation thereto, in associated roller carriages (16, 20) and a setting device (13) for one of the two rollers, and also possibly a rotary drive (31) for one of the rollers, characterized
   in that each straightener withdrawal unit (7) comprises a crosshead (11) which is releasably connected to the uprights (8), which form a receiving opening (9) for the straightener withdrawal unit,
   in that the setting device (13) for the settable inner arc roller (18) is mounted articulatedly on the crosshead (11),
   in that each roller of the pair of rollers is supported in a roller carriage (16, 20) and the roller carriage (16) of the inner arc roller (18) is guided displaceably on guides (19) of the uprights (8),
   in that the roller carriage (16) of the inner arc roller (18) is connected to the setting device (13), and
   in that the roller carriage (20) of the outer arc roller (21) and the roller carriage (16) of the inner arc roller (18) are mounted articulatedly on the crosshead (11), wherein the roller carriage (16) of the inner arc roller (18) is mounted articulatedly on the crosshead (11) such that its spacing from the roller carriage (20) of the outer arc roller (21) can be changed.
2. Multi-strand continuous casting installation according to Claim 1, characterized in that the position of the roller carriage (20) of the outer arc roller (21) in the support stand (3a, 3b) is fixed.
3. Multi-strand continuous casting installation according to either of the preceding claims, characterized in that each support stand (3a, 3b) is assigned a media supply system (33) for supplying the straightener withdrawal units (7) arranged in the support stand (3a, 3b) with media, and the individual straightener withdrawal units (7) can be coupled to said media supply system (33) by automatic coupling devices (34) during insertion of the straightener withdrawal units (7) into the receiving opening (9).
4. Multi-strand continuous casting installation according to one of the preceding claims, characterized in that the setting device (13) acts centrically on a settable inner arc roller (18) of the straightener withdrawal unit (7), is arranged in the direction of the longitudinal extent of the comb-like receiving opening (9), is supported articulatedly or such that it can pivot on the crosshead (11) and is secured articulatedly or such that it can pivot on the roller carriage (16) of the inner arc roller (18).
5. Multi-strand continuous casting installation according to one of the preceding claims, characterized in that the rotary drive (31) for the inner arc roller (18) is supported directly on the straightener withdrawal unit (7), preferably on the roller carriage (16) of the inner arc roller (18), and is connected to the inner arc roller (18) via a gear (32).
6. Multi-strand continuous casting installation according to one of the preceding claims, characterized in that support stands (3a, 3b) which are independent of one another and straightener withdrawal units (7) which are independent of one another are assigned to individual casting strands (6) of the multi-strand continuous casting installation in the straightening zone (5).
7. Multi-strand continuous casting installation according to one of the preceding claims, characterized in that the straightening zone (5) for each casting strand (6) of the multi-strand continuous casting installation is formed by a plurality of support stands (3a, 3b) arranged one behind another.
8. Multi-strand continuous casting installation according to one of the preceding claims, characterized in that the setting device (13) for the settable inner arc roller (18) of each straightener withdrawal unit (7) is designed so as to be individually drivable.
9. Multi-strand continuous casting installation according to Claim 8, characterized in that the setting device (13) comprises a pressure medium cylinder (13a), a control block (27) and a displacement tracking system (28), and the control block is preferably connected to the installation control device via a data line.
10. Multi-strand continuous casting installation according to Claim 9, characterized in that calibrating strips (30) for calibrating the displacement tracking system (28) are arranged on the roller carriage (16) of the inner arc roller (18) and on the roller carriage (20) of the outer arc roller (21).

Images