KR20110019383A - Multi-strand continuous casting system - Google Patents

Abstract

FIELD OF THE INVENTION The present invention relates to a multi-strand continuous casting system for producing metal strands having billet-shaped or bloom-shaped cross-sections, comprising a strand guide comprising an alignment zone comprising a drive alignment subassembly, and comprising a plurality of drive The alignment subassemblies are arranged longitudinally in the direction of the strand guide in the common support frame with the comb-shaped uprights in the receiving openings formed between the uprights, each driving alignment subassembly being arranged in an outer arc in the outer arc roller and associated roller sleds. An inner arc roller actuated relative to the roller and an actuating device for one of the two rollers, and optionally a rotational drive for one of the rollers. An actuating device, each drive alignment subassembly including a crosshead detachably connected to an upright portion that defines a receiving opening for the drive alignment subassembly, to ensure easy installation and removal when the rollers are required to be replaced; Inner arc rollers are hinged at the crosshead for the operable inner arc roller, each roller of the roller pair is supported on the roller sled and the two roller sleds are slidably guided within the guides of the uprights. It is proposed that the roller sleds of the two be connected to the drive alignment subassembly.

Description

Multi-strand Continuous Casting System {MULTI-STRAND CONTINUOUS CASTING SYSTEM}

The present invention relates to a multi-strand continuous casting plant for the production of metal strands with billet or bloom cross sections, comprising a straightening zone equipped with a straightener withdrawal unit. A plurality of straightening take-out units, arranged one behind another in the direction in which the strands are conveyed, are arranged in a common support stand with a comb-shaped upright in the receiving opening formed between the uprights, each straightening The drawing unit comprises a pair of rollers having an outer arc roller actuated in the associated roller carriage and an inner arc roller actuated relative to the outer arc roller, and a setting device for one of the two rollers, And also possibly a rotational drive for one of the rollers.

The straightening take-out unit is adapted to bend the continuous solidified metal strand through the arced strand guide zone so that it is straightened again within the transfer area to the horizontal run-out roller table, and through the strand guide defined by the extraction rate. To ensure uniform transport, it is used in single-strand or multi-strand continuous casting plants, in particular for continuous casting plants for the production of steel strands with different cross-sectional shapes. The straightening drawing unit can also be used to perform what is known as soft reduction, in which the microstructure is improved by this strand deformation in the final solidification area just before the liquidus tip.

The straightening take-out unit typically includes a pair of rollers supported on a stand frame. The roller of one of the pair of rollers, preferably the roller of the roller stand on the inner side of the arc, is designed to be set for additional rollers for varying the strand thickness in the stand and on the strands by means of a hydraulic setting cylinder. Is pressurized. Such rollers are usually connected to a rotary drive. Many such straightening take-out units are installed on the joint support frame in longitudinal direction in the direction in which the strands are conveyed to form straightening zones in the continuous casting plant. Continuous casting plants with individual straightening drawing units arranged in this way are disclosed from WO 03/070399 A1, DE 10 2004 057 427 A1 or DE 22 39 966 A1.

However, in order to jointly straighten a number of steel strands conveyed next to each other and having a billet or bloom cross section, a straightening take-out unit of the type of problem being designed is already disclosed from DE 30 34 444 A1. A plurality of straightening take-out units, each formed by a pair of rollers, are arranged on a common support stand. On the inner side of the arc, this support stand has an open chamber in which the rollers of the straightening take-out unit are mounted together with their installation parts. The support housing of the plant part and the settable roller is articulatedly mounted on the hydraulic cylinder, for which the hydraulic cylinder is supported on the support stand. Replacement of the straightening take-out unit involves a high level of expenditure on the installation, since it is necessary to release the hydraulic cylinder from the fixing of the hydraulic cylinder in the support stand and also to release the corresponding supply line, such as the pressure medium connection.

DE 27 31 748 A1 also includes a straightening roller stand, in which a plurality of successive pairs of rollers are arranged in a guide, which is arranged in a comb-shaped shape of the machine stand. The individual rollers are supported via a support housing on the crossbeam, the support housing interacting with the light-shaped guide. Each crossbeam can be set on a cast strand by two pressure medium cylinders. In this case, it is also necessary to release the cross beam from the pressure medium cylinder in which the pressure medium cylinder may remain in the installation when removing the straightening drawing unit.

The object of the present invention is therefore a multi-strand continuous casting installation with straightening zones, which is distinguished by the fact that it avoids the disadvantages of the known prior art and requires little maintenance and the easy installation and removal when it is necessary to replace the rollers. The purpose is to propose.

Continuing from the multi-strand continuous casting installation of the type mentioned in the introduction, this object is achieved by a crosshead releasably connected to the uprights, where each straightening drawing unit forms a receiving opening for the straightening drawing unit. And a setting device for the configurable inner arc roller is articulated on the crosshead, each roller of the pair of rollers is supported on the roller carriage and the roller carriage of the inner arc roller is displaced on the guide of the uprights. It is possibly guided and is achieved by the fact that the roller carriage of the inner arc roller is connected to the setting device. The special configuration of the individual parts of the straightening take-out unit is a setting device, in particular also for a driven internal arc roller, as a modular configuration, which is common to many straightening take-out units by releasing fewer fixing elements. From or into the support stand, it is possible to remove or reinsert the entire straightening drawing unit.

The roller carriage of the outer arc roller and the roller carriage of the inner arc roller are articulatedly mounted on the crosshead, and the roller carriage of the inner arc roller can change the distance of the roller carriage of the inner arc roller from the roller carriage of the outer arc roller. It is articulated to help. This articulated mounting is preferably achieved using a support bracket, which allows the movement of the two roller carriages with respect to each other. The installation and removal of the joint is thus easily possible and the structural differences between the base stand and in particular the support stand of the straightening take-out unit can be compensated for. As a result, firstly the crosshead can be fixed on the upright and secondly the roller carriage of the outer arc roller can be supported and fixed in the receiving opening formed by the upright of the support stand in the basic area on the support bracket. . Here, when passing through the strand guide stand, the outer arc roller forms a fixed side of the strand guide, and the cast metal strand is supported on the fixed side of the strand guide when the cast metal strand is transported through the continuous casting facility. .

The supply of fluid to the individual straightening withdrawal units in the straightening zone provides a media supply system for supplying the media to the straightening withdrawal unit, where each support stand is arranged in such a support stand, and the individual straightening withdrawal unit into the receiving opening. It can be considerably simplified in that it can be coupled to the media supply system by an automatic coupling device during insertion of the straightening take-out unit. The media supply line is routed onto the support stand with separate straightening take-out units and exits into the coupling half of the multi-coupling in the basic area of each receiving opening on the support bracket. Further coupling halves of the multiple couplings are arranged on the roller carriage of the outer arc roller. Each roller carriage of the outer arc roller is arranged on a support bracket, and the multi-coupling is automatically closed for all required media. Multiple automatic quick-action couplings for different media can also be arranged next to each other. If appropriate, it is possible for refrigerant, lubricating oil, hydraulic oil, current, compressed air and other media as required to be supplied through this multi-coupling. Moreover, individual media supply lines are routed to each part of the straightening take-out unit.

In order to ensure that the inner arc roller is arranged in a planar manner on the metal strands and to reliably avoid the tilting force, the setting device acts in the center on the settable inner arc roller of the straightening take-out unit, the end of the comb-shaped receiving opening It is convenient to be arranged in the direction of the direction magnitude, and to be articulated or supported so that the setting device can be pivoted on the crosshead and to be fixed articulated or so that the setting device can be pivoted on the roller carriage of the inner arc roller.

Internal arc rollers are usually designed to be driven within the straightening zone of a continuous casting plant. In order to ensure that the straightening take-out unit can be easily installed and removed with a compact design, the rotary drive for the inner arc roller is supported directly on the straightening take-out unit, preferably on the roller carriage of the inner arc roller, Useful when connected to the inner arc roller via angular gears. The rotary drive is preferably supported by a torque strut. The gear is preferably designed as a social gear.

Furthermore, it is convenient for the support stands independent of each other and the straightening withdrawal units independent of each other to be provided for the individual casting strands of the multi-strand continuous casting installation in the straightening zone. Interactions can be avoided as this occurs especially in the case of straightening take-out units according to DE 30 34 444 A1.

In the case of very long straightening zones, the straightening zones for each casting strand of the multi-strand continuous casting plant are formed by a plurality of support stands arranged longitudinally.

In particular in order to carry out the light reduction in the straightening zone and the distinctive wedges thereby required, it is necessary for the setting device for the configurable inner arc roller of each straightening take-out unit to be designed to be individually driveable and adjustable.

The setting device used is usually a pressure medium cylinder which is hydraulically actuated. Setting devices of this type include pressure medium cylinders, control blocks and displacement tracking systems. In the sense of control engineering, the control block is connected to the facility control device via a data line. A displacement tracking system, for example a position sensor, is used at the beginning of the casting to adjust the internal arc roller settable to the thickness of the start-up strand and subsequent hot strands. In the case of deformation wedges, i.

A calibrating strip is placed on the roller carriage of the outer arc roller and the roller carriage of the inner arc roller to adjust the displacement tracking system. The two roller carriages can move towards each other until the roller carriage of the inner arc roller bears against the roller carriage of the outer arc roller via the adjustment strip. This position determines the reference spacing for strand thickness adjustments to be made.

Further advantages and features of the present invention will become apparent from the following detailed description of a non-limiting exemplary embodiment, which is referred to by the accompanying drawings.

1a is a longitudinal cross section through a straightening zone of a continuous casting plant having a straightening drawing unit according to the invention,
1b is a further longitudinal section through the straightening zone of a continuous casting plant having a straightening drawing unit according to the invention,
FIG. 2a is a transverse cross section through a straightening zone of a multi-strand continuous casting plant having a straightening drawing unit according to the invention along the section line AA of FIG. 1a, FIG.
FIG. 2b is a transverse cross section through the straightening zone of a multi-strand continuous casting plant having a straightening drawing unit according to the invention along the section line AA of FIG. 2a, FIG.
3 is a perspective view of the straightening drawing unit according to the present invention, showing the essential parts of the straightening drawing unit according to the invention.

1A, 1B, and 2A, 2B schematically show the straightening zones of six strand multi-strand continuous casting installations in longitudinal and transverse cross sections in two respective figures. The two support stands 3a, 3b are releasably secured to the support frames 2a, 2b, 2c, 2d by means of a tightening bolt 4 on the plant foundation 1. The support stand 3a has an arched portion and the support stand 3b has a straight portion. Together, the support stand 3a and the support stand 3b form a straightening zone 5 of the continuous casting plant. In this support stand, the steel strands 6 passing through the arched strand guides located upstream from the straightening zones are straightened jointly in the straightening take-out unit 7 and possibly also under reduced pressure. As can be seen from FIG. 2, each casting strand provides independent support stands 3a, 3b, either or two of which are supported on the support frame 2d.

The support stands 3a, 3b are designed as a frame structure, in which a series of comb-shaped uprights 8 are lifted from this support stand and form a receiving opening 9 between the upstanding portions, and into the receiving openings individually. The straightening drawing unit 7 is inserted. In each case four uprights are arranged in quad form as the receiving opening. Each support stand is designed to receive a plurality of straightening take-out units arranged longitudinally in the direction in which the strands are conveyed, where the support stands 3a receive three straightening take-out units 7 and support stands 3b. Accommodates four straightening drawing units 7. Each such straightening drawing unit 7 forms a self-contained structural unit that can be installed or removed as a whole.

The straightening drawing unit is shown in more detail in the figure. Each straight out draw unit has a crosshead 11, which forms a support frame for all of the parts of the straight out draw unit. The crosshead 11 is releasably secured at the upper end of the four uprights 8, which are raised using a connecting bolt 12 or using another fastening element together to define the receiving opening 9. The setting device 13, formed by the driveable pressure medium cylinder 13a, is pivotally supported in the crosshead 11 by the pivot bolt 14. The roller carriage 16 is articulated by the pivot bolt 17 so that the roller carriage can be pivoted on the piston rod 15 of the pressure medium cylinder 13a. The inner arc roller 18 is rotatably supported in a bearing on the roller carriage 16. The roller carriage 16 is guided on the radial orientation guide 19, on a generally replaceable guide strip, in a radial support stand 3a in the radial direction and in a straight support stand 3b formed horizontally in the vertical direction. Guided displaceably by groove 19a.

The roller carriage 20 of the outer arc roller 21 is articulatedly mounted under the roller carriage 16 of the inner arc roller 18 and is releasable to the base plate 23 in the receiving opening 9 using a fixing element. Can be fixed. In this sense, this allows the roller carriages 16 and 20 to move slightly relative to each other, which compensates for small manufacturing related differences in spacing to avoid installation related distortions in the straightening take-out unit. For this purpose, the support bolt 17 is similar to the roller carriage 20 of the outer arc roller 21, and the roller carriage 16 of the inner arc roller 18 in the slot (not shown in detail) on the support bracket 26. Guided on). The roller carriage 20 is also guided radially or vertically by the guide grooves 19a on the guides 19 of the uprights 8. The inner arc roller 18 and the outer arc roller 21 of the straightening drawing unit form a pair of rollers that interact.

The setting device 13 acts in the center on the inner arc roller 18 which is settable via the roller carriage 16. In particular when the setting device is designed as a pressure medium cylinder 13a, it is oriented in the direction of the longitudinal magnitude of the comb-shaped receiving opening 9, so that the line of action of the applied force is rotated of the inner arc roller 18. Intersect with axis (not shown in detail).

The setting device 13 is adapted to move the inner arc roller 18 or the roller carriage 16 of the inner arc roller 18 relative to the outer arc roller 21 and thus onto the steel strand 6. It can be used to set the roller carriage 16 of the inner arc roller 18 or the inner arc roller 18 with respect to 21, which passes through the continuous casting installation at a predetermined or controlled contact pressure, which is thick It is ensured that a straightening or a predetermined reduction in is achieved (pressure reduction or other metallurgical treatment). In order to be able to position the inner arc roller 18 at a predetermined strand thickness, the control block 27 and the displacement tracking system 28 are provided to the setting device 13 and the pressure medium cylinder 13a, respectively. By way of example, a displacement sensor for sensing the position of the piston of the pressure medium cylinder is provided as a displacement tracking system. An adjustment strip 30 is provided on two roller carriages 16, 20 to adjust the displacement tracking system 28.

The inner arc roller 18 of the individual straightening take-out unit 7 is mainly in the form of a driven roller, in order to ensure that the conveying speed of the casting strand is constant and to perform light reduction. 1 shows a driven inner arc roller 18a and a non-driven inner arc roller 18b. The rotary drive 31 of the driven inner arc roller 18a, which is formed by an electric motor, is fixed on the crosshead 11 and preferably via the gear 32, which is preferably in the form of a social gear. It is connected to the drive shaft of 18a.

Each support stand 3a for each strand so as to supply the working medium required for operation, for example, coolant, lubricant, compressed air, hydraulic oil, current, open-loop and closed-loop control signals to the individual straightening take-out units. , 3b) provides a common medium supply system 33 for all of the straightening take-out units 7 arranged on each support stand. However, partial supply systems are also possible for certain working media. Proceeding from the common supply line, the branch line for each medium is led to a common coupling device 34 on the base plate 23 of each receiving opening of the straightening take-out unit. One coupling half of this coupling device 34, in the form of a multi-coupling, is fixed to the base plate, and the second coupling half is fixed to the roller carriage 20 of the outer arc roller 21. When the roller carriage 20 is inserted into the receiving opening 9 and fixed to the base plate 23, all of the medium supply lines are coupled to each other.

FIG. 3 is a perspective view of an essential part of the straightening take-out unit, as FIG. 3 can be substantially installed on or removed from an arched or straight support stand as a subassembly. The depicted numerals relate to the detailed description given above with reference to FIGS. 1A-2B.

1 facility basics
2a, 2b, 2c, 2d support frame
3a arched support stand
3b straight support stand
4 clamping bolt
5 straightening zones
6 river strand
7 Straightening Drawer Unit
8 comb-shaped uprights
9 Receptacle opening for straightening take-out unit
11 crosshead
12 connecting bolts
13 setting device
13a pressure medium cylinder
14 pivoting bolt
15 piston rod
16 Roller carriage of the inner arc roller
17 pivoting bolt
18 internal arc roller
19 Guide
19a guide groove
20 Roller carriage of outer arc roller
21 outer arc roller
23 base plate
26 support bracket
27 control blocks
28 displacement tracking system
30 adjustable strips
31 rotary drive
32 gears
33 Media Supply System
34 coupling device
R casting direction

Claims (11)

As a multi-strand continuous casting installation for the production of metal strands having billet or bloom cross sections, with strand guides comprising a straightening zone 5 with a straightener drawing unit 7. ,
A plurality of straightening take-out units 7 arranged longitudinally in the direction in which the strands are conveyed have a common support stand 3a, 3b with the comb-shaped uprights in the receiving opening 9 formed between the comb-shaped uprights. A pair having an inner arc roller 18 and an inner arc roller 18 movable relative to the outer arc roller 21 in the associated roller carriages 16, 20. In a multi-strand continuous casting installation comprising a roller 13 and a setting device 13 for one of the two rollers, and possibly a rotary drive 31 for one of the rollers,
Each of the straightening drawing units 7 comprises a crosshead 11 releasably connected to the uprights 8, which form a receiving opening 9 for the straightening drawing unit, the settable internal arc The setting device 13 for the roller 18 is articulatedly mounted on the crosshead 11, each roller of the pair of rollers is supported at the roller carriages 16, 20, and The roller carriage 16 of the inner arc roller 18 is displaceably guided on the guide 19 of the uprights 8, and the roller carriage 16 of the inner arc roller 19 is the setting device 13. Characterized in that connected to,
Multi-strand continuous casting plant.
The method of claim 1,
The roller carriage 20 of the outer arc roller 21 and the roller carriage 16 of the inner arc roller 18 are articulatedly mounted on the crosshead 11, and the inner arc roller 18 Of the roller carriage 16 of the inner arc roller 18 from the roller carriage 20 of the outer arc roller 21 is articulated on the crosshead 11. Characterized in that the interval of 16) can be changed,
Multi-strand continuous casting plant.
The method according to claim 1 or 2,
The position of the roller carriage 20 of the outer arc roller 21 in the support stand (3a, 3b) is fixed,
Multi-strand continuous casting plant.
The method according to any one of claims 1 to 3,
Each of the support stands 3a and 3b is provided with a medium supply system 33 for supplying a medium to the straightening take-out unit 7 disposed on the support stands 3a and 3b, and the individual straightening take-out unit ( 7) can be coupled to the medium supply system 33 by an automatic coupling device 34 during the insertion of the straightening take-out unit 7 into the receiving opening 9,
Multi-strand continuous casting plant.
The method according to any one of claims 1 to 4,
The setting device 13 acts in the center of the settable inner arc roller 18 of the straightening drawing unit 7, is arranged in the direction of the longitudinal size of the comb-shaped receiving opening 9, and articulated. Or so that the setting device is pivotally supported on the crosshead 11 and articulated or fixed so that the setting device can be pivoted on the roller carriage 16 of the inner arc roller 18. Characterized in that
Multi-strand continuous casting plant.
6. The method according to any one of claims 1 to 5,
The rotary drive 31 for the inner arc roller 18 is directly supported on the straightening take-out unit 7, preferably on the roller carriage 16 of the inner arc roller 18, and the gear 32 is supported. Characterized in that connected to the inner arc roller 18 via,
Multi-strand continuous casting plant.
The method according to any one of claims 1 to 6,
Support stands 3a, 3b independent of each other and a straightening drawing unit 7 independent of each other are provided on the individual casting strands 6 of the multi-strand continuous casting installation in the straightening zone 5. ,
Multi-strand continuous casting plant.
The method according to any one of claims 1 to 7,
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 longitudinally,
Multi-strand continuous casting plant.
The method according to any one of claims 1 to 8,
The setting device 13 for the configurable inner arc roller 18 of each straightening drawing unit 7 is characterized in that it is designed to be driven individually,
Multi-strand continuous casting plant.
The method of claim 9,
The setting device 13 comprises a pressure medium cylinder 13a, a control block 27 and a displacement tracking system 28, which control block is preferably connected to the facility control device via a data line. Characterized by
Multi-strand continuous casting plant.
The method of claim 10,
The adjusting strip 30 for adjusting the displacement tracking system 28 is arranged on the roller carriage 16 of the inner arc roller 18 and the roller carriage 20 of the outer arc roller 21. Made,
Multi-strand continuous casting plant.

Images