WO2009144107A1

WO2009144107A1 - Multi-strand continuous casting system

Info

Publication number: WO2009144107A1
Application number: PCT/EP2009/055096
Authority: WO
Inventors: Günther DEIBL; Josef Guttenbrunner; Gerhard Kern; Reinhard Simon
Original assignee: Siemens Vai Metals Technologies Gmbh & Co
Priority date: 2008-05-26
Filing date: 2009-04-28
Publication date: 2009-12-03
Also published as: KR101622100B1; KR20110019383A; CN102066022B; AT506824B1; CN102066022A; AT506824A1; EP2285512A1; EP2285512B1

Abstract

The invention relates to a multi-strand continuous casting system for manufacturing metal strands having a billet-shaped or bloom-shaped cross section, with a strand guide that comprises an alignment zone containing drive alignment subassemblies, wherein a plurality of drive alignment subassemblies disposed one after the other in the strand guide direction in a common support frame with comb-like uprights in receptacle openings formed between the uprights, and wherein each drive alignment subassembly comprises a pair of rollers with an outer arch roller and a inner arch roller moving relative thereto in associated roller sleds and an activation device for one of the two rollers, and optionally a rotational drive for one of the rollers. To ensure ease of installation and removal in the event that rollers need to be replaced it is proposed that each drive alignment subassembly comprise a cross head that is detachably connected to the uprights that form a receptacle opening for the drive alignment subassembly, that the activation device is hinged at the cross head for the activatable inner arch roller, that each roller of the roller pair is supported in a roller sled and the two roller sleds are slidably guided in guides of the uprights and that the roller sled of the activatable inner arch roller is connected to the drive alignment subassembly.

Description

Mehrstranq-Stranqqießanlaqe:

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 stanchions formed in the uprights receiving openings 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 side 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 machine with individual drive-straightening units in this arrangement is already known from WO 03/070399 A1, DE 10 2004 057 427 A1 or DE 22 39 966 A1.

Abrasive power units of the generic type, however, are designed for the joint straightening of several steel strands conveyed side by side with billet or billet cross section, are already known from DE 30 34 444 A1. 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 DE 27 31 748 A1 also a straightening roller stand is known in which a plurality of successive pairs of rollers are arranged in a 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 driving straightening unit to release the cross member of the pressure medium cylinders, wherein the pressure medium cylinder can remain in the system.

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 reel change.

This object is achieved on the basis of a multi-strand continuous casting machine of the type mentioned above in that each driving straightening unit comprises a crosshead, the is releasably connected to the receiving opening for the Treibrichtaggregat forming Stehern that on the crosshead the adjusting device is articulated for the engageable inner-bow roller that each role of the pair of rollers is supported in a roller carriage and the roller carriage of the inner bow roller is guided slidably on guides of the uprights and that the roller carriage of the inner-bow roller is connected to the adjusting device. 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 each Treibrichtaggregate in the straightening zone can be substantially simplified by each support frame is assigned a media supply system for the supply of arranged in this scaffold 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. Furthermore, 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 acts centrally 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 articulated 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 that are independent of one another and to independent screeding aggregates. Mutual influences, as they occur especially in the case of propulsion units according to DE 30 34 444 A1, can thus be avoided.

For straightening zones of great length, the straightening zone for each cast strand of the multi-strand continuous casting plant is formed by a plurality of support stands 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, such as a position sensor, the engageable inner bow roller is set at the start of casting on the thickness of the Anfahrstranges and the subsequent hot strand. The setting of the deformation wedge, ie the gradual roll-to-roll reduction in a soft reduction, is achieved by activating the setting device as a function of the position signal of the tracking 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

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:

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

1 b is 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 shows a cross section through the straightening zone of a multi-strand continuous casting with

Drive control units according to the invention along the section line A-A in Fig. 1a,

2b shows a cross section through the straightening zone of a multi-strand continuous casting with

Drive control units according to the invention along the section line AA in Fig. 2a, Fig. 3 is a perspective view of a Treibrichtaggregat according to the invention, showing essential components of the invention Treibrichtaggregates.

Embodiment of the invention

In FIGS. 1 a, 1 b and 2 a, 2 b, the straightening zone of a six-stranded multi-strand continuous casting plant is schematically illustrated in a longitudinal section and a cross section in two representations in each case. 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. As can be seen from FIG. 2, each casting strand is assigned an independent supporting framework 3a, 3b, whereby either one or two of these supporting frameworks are supported on a supporting 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 propulsion unit has a crosshead 1 1, which forms a support frame for all components of the propulsion unit. The crosshead 1 1 is releasably secured to four uprights, 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 cylinder 13a, is pivotally supported with pivot pin 14 in the crosshead 1 1. 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 oriented 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. Figure 1 shows powered 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 Treibrichtaggregate with the necessary for operation operating media, such as cooling water, lubricant, compressed air, hydraulic oil, electricity, control and regulating signals, each support frame 3a, 3b arranged for each strand a common media supply system 33 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 driving straightening unit in an oblique view, as it can essentially be installed as an assembly from the arcuate or straight support frame or can be removed from it. The registered reference numbers refer to the above description with reference to FIGS. 1a to 2b.

LIST OF REFERENCE NUMBERS

1 plant foundation

2a, 2b, 2c, 2d supporting frame

3a arched scaffold

3b straight scaffold

4 clamping screws

5 straightening zone

6 steel strand

7 Driving straightening unit

8 comb-like stanchions

9 receiving opening for the drive-leveling unit

11 crosshead

12 connecting bolts

13 adjusting device

13a pressure cylinder

14 pivot pins

15 piston rod

16 roller carriages of the inner bow rollers

17 pivot pins

18 inner bow roll

19 tours

19a guide groove

20 roller carriages of the outer bow roller

21 outer bow roll

23 base plate

26 carrying strap

27 control block

28 tracking system

30 calibration bar

31 rotary drive

32 gears

33 media supply system

34 coupling device

R casting direction

Claims

claims:

1. multi-strand continuous casting plant for the production of metal strands with billet or Vorblockquerschnitt with a strand guide comprising a with Richtrichtaggregaten (7) equipped straightening zone (5), wherein a plurality of in the strand conveying direction successively arranged Treibrichtaggregate (7) in a common support frame (3a, 3b) are arranged with comb-like uprights (8) formed in between the uprights receiving openings (9) and each Treibrichtaggregat a pair of rollers with an outer-bow roller (21) and a relative movable inner-bow roller (18) in associated roller carriage (16, 20) and a positioning device (13) for one of the two rollers, and possibly a rotary drive (31) for one of the rollers, characterized in that each drive-straightening unit (7) comprises a cross-head (11) connected to the one receiving opening (9) for the Treibrichtaggregat forming stators (8) is detachably connected, that at the crosshead (11) the A nstellvorrichtung (13) for the engageable inner-bow roller (18) is hinged, that each roller of the roller pair in a roller carriage (16, 20) is supported and the roller carriage (16) of the inner-bow roller (18) on guides (19) of Stand (8) is slidably guided and that the roller carriage (16) of the inner-bow roller (18) with the adjusting device (13) is connected.

2. multi-strand continuous casting machine according to claim 1, characterized in that the roller carriage (20) of the outer-bow roller (21) and the roller carriage (16) of the inner-bow roller (18) on the crosshead (11) is articulated, wherein the roller carriage ( 16) of the inner-bow roller (18) adjustable in distance to the roller carriage (20) of the outer-bow roller (21) on the crosshead (1 1) is hinged. ,

3. multi-strand continuous casting plant according to claim 1 or 2, characterized in that the roller carriage (20) of the outer-bow roller (21) in the support frame (3a, 3b) is fixed in position.

4. multi-strand continuous casting plant according to one of the preceding claims, characterized in that each support frame (3a, 3b) is assigned a media supply system (33) for the supply of the support frame (3a, 3b) arranged Treibrichtaggregate (7) and the individual Treibrichtaggregate ( 7) can be coupled to this media supply system (33) by automatic coupling devices (34) when inserting the drive-adjusting units (7) into the receiving opening (9).

5. multi-strand continuous casting plant according to one of the preceding claims, characterized in that the adjusting device (13) acts centrally on an engageable inner-bow roller (18) of the drive-rectifying unit (7), in the direction of the longitudinal extension of the comb-like receiving opening (9) is arranged and on the crosshead (1 1) pivotally or articulated supported and on the roller carriage (16) of the inner-bow roller (18) is pivotally mounted or hinged.

6. multi-strand continuous casting plant according to one of the preceding claims, characterized in that the rotary drive (31) for the inner-bow roller (18) directly on the drive rectifying unit (7), preferably on the roller carriage (16) of the inner-bow roller (18) supported and via a gear (32) with the inner-bow roller (18) is connected.

7. multi-strand continuous casting plant according to one of the preceding claims, characterized in that individual casting strands (6) of the multi-strand continuous casting in the straightening zone (5) independent supporting frames (3a, 3b) and independent of each other Treibrichtaggregate (7) are assigned.

8. multi-strand continuous casting plant 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 of several consecutively arranged support structures (3a, 3b) is formed.

9. multi-strand continuous casting plant according to one of the preceding claims, characterized in that the adjusting device (13) for the engageable inner-bow roller (18) of each drive rectifying unit (7) is designed individually controllable.

10. multi-strand continuous casting plant according to claim 9, characterized in that the adjusting device (13) comprises a pressure medium cylinder (13a), a control block (27) and a Wegverfolgungssystem (28) and the control block is preferably connected to the Anlagenleiteinrichtung via a data line.

11. multi-strand continuous casting machine according to claim 10, characterized in that arranged on the roller carriage (16) of the inner-bow roller (18) and the roller carriage (20) of the outer-bow roller (21) Kalibrierleisten (30) for calibrating the tracking system (28) are.