EP1525931A1 - Arrangement for determining the consistency of a cast strand and/ or the roll opening in a continuous casting machine . - Google Patents

Abstract

Device for determining the consistency of a casting strand (5) in a continuous casting installation and/or in the throat width comprises a measuring roller (6) in contact with a casting strand, a first guiding element (11) on which the roller is located to rotate about the axis of rotation (7), a second guiding element (12), and a linear drive (14) interacting with the guiding elements and in contact with the casting strand.

Description

The invention relates to an arrangement for determining the consistency of a cast strand in a continuous casting plant and / or the mouth width of the same.

The productivity of a continuous casting machine is determined by the casting speed and determines the casting format. The format thickness is usually through the following Specified processing plants. Productivity increases are essentially achievable by the highest possible casting speed. It should the casting speed be adjusted so that the solidification ideally in the end the strand guide assembly of the continuous casting is done. For this Basically it is important for the operation of the continuous casting plant that it is known where the swamp tip is located, and where the strand is already solidified. For detection the swamp tip in the cast strand are known various methods. Especially the sump tip detection is favorable by using the mechanical or dynamic properties of the cast strand depending on its consistency. Such a method is, for example, in the article "Innovation in the Continuous Casting: Improving Quality and Efficiency through CyberLink - Technology "by Peter Müller, Georg Grundmann, Horst von Wyl and Wolfram Jung and Ingo Schubert, described in steel and iron of September 2002. After that is in a continuous casting, which has a guide assembly for the casting strand several paired lower and upper frames and guide rollers has, provided that the upper frame of a pair arranged to the stationary Subframe is oscillatable, so that the jaw width varies between the two becomes. The oscillation then moves in a small adjustment range of ± 0.3 mm with a frequency of 3 Hz. During the oscillation the way of the Upper frame and the required cylinder force measured in the actuating cylinder and plotted in a force path diagram, resulting in a hysteresis curve results whose surface area represents the energy required for the oscillation. Predefined value ranges are representative of the assessment of the condition the cast strand, for example, the solidified strand. Although with the there described suspension of the upper frame a largely low-friction arrangement achieved, however, the masses to be accelerated are significant. they lay in the frame of 20 to 30 tons. Since each upper frame has several support rollers, only an average of the contact of all support rollers with the cast strand provided for the evaluation. By the high to be accelerated Masses, the oscillation is limited to low values. At low frequencies is the useful signal is small. This affects the measurement accuracy.

Furthermore, a considerable number of continuous casting plants are in operation, in which the sub-frame and the upper frame in the casting operation in fixed positions to each other are held, which are not changeable in operation. A conversion to movable Upper frame would result in significant costs.

The invention is based on the object, an arrangement for determining the consistency a cast strand in a continuous casting of the same and / or the mouth width which allows a more accurate measurement, in particular with that for the Evaluation signals are provided, the more accurate measurement results generate, and the retrofitting of existing continuous casters cost allowed.

• eine Messrolle,
  die mit dem Gießstrang in Kontakt bringbar ist und ein erstes Längsende und ein zweites Längsende sowie eine Drehachse aufweist,
• ein erstes Führungselement,
  an dem die Messrolle um die Drehachse drehbar gelagert ist,
• ein zweites Führungselement,
  dem gegenüber das erste Führungselement entlang einer Stellebene,
  die die Drehachse enthält, bewegbar geführt ist, und
• einen Linearantrieb,
  • der am ersten Führungselement und am zweiten Führungselement angreift und
  • über den die Messrolle entlang der Stellebene kraft- und/oder wegegesteuert mit dem Gießstrang in Kontakt bringbar ist.

This object is achieved according to the invention by an arrangement for determining the consistency of a cast strand in a continuous casting plant and / or the mouth width thereof

• a measuring roll,
  which can be brought into contact with the cast strand and has a first longitudinal end and a second longitudinal end and an axis of rotation,
• a first guide element,
  on which the measuring roller is rotatably mounted about the axis of rotation,
• a second guide element,
  opposite the first guide element along a plane,
  which contains the axis of rotation, is movably guided, and
• a linear drive,
  • which engages the first guide element and the second guide element and
  • by means of which the measuring roller along the setting plane can be brought into contact with the cast strand in a force-controlled and / or path-controlled manner.

The fact that only one measuring roller is provided, results in a concentrated on this and thus more accurate measurement result. Due to the reduced to be moved Masses can be higher speeds in the power or path-controlled movement be achieved, which also affects the measurement accuracy favorable. The From the force or path-controlled movement derivable signals can be known Methods are evaluated, for example by evaluating the decay curve, for example, from an oscillating motion. Overall, the Detecting the sump tip in the casting strand more accurately, allowing productivity can be increased by increasing the casting speed. The measurement results can also be used to determine the optimal jaw width, i. for adjustment and control of the machine paper, and for the determination of the role wear be used. It also becomes possible the position in the strand guide of the continuous casting to determine more precisely, the most favorable for a so-called "soft-reduction" suitable for improving the quality of the product.

A particularly favorable arrangement results when the linear actuator two actuators which respectively close to the longitudinal ends of the measuring roller on the first Attacking guide element and both individually and together for transmission to serve a linear movement. The actuators can synchronously and For example, at the same time generate an oscillating motion, so that the signals can be evaluated separately from the two actuators, for example with a relatively wide cast strand consistency differences towards To better recognize the lateral ends of the cast strand.

Preferably, as a linear drive, a hydraulic linear drive, for example a Hydraulic cylinder, provided. Hydraulic oscillating drives are known per se. Preferably, the actuators are designed as hydraulic cylinders, the near the longitudinal ends of the measuring roller on the inner guide element, which is the Wearing measuring roll, interacting.

If the arrangement according to the invention is to be used as a single unit, that of the usual arrangements with a top frame and a subframe is separated, or is assigned to a top frame opposite in the casting operation the sub-frame is held stationary, it is provided that the second guide element connected to an actuator and through this at least between two positions is adjustable along the placement plane. Such a setting is for example useful if larger adjustment paths in the direction of the casting strand, for example for a starter train, are required. This actuator can also be shown as a hydraulic cylinder.

A particularly favorable and low-friction mutual association between the first guide element and the second guide element is achieved by the second guide element surrounds the first guide element like a frame, that the first guide element with the second guide element without contact is connected by at least two cable elements and that the first guide element by at least one spring supported on the second guide element is acted upon so that the rope elements are claimed to train. It can For example, in oscillatory motion of the measuring roller, the frequency designed be that it is in the range of natural frequency of the unit. With this measure the accuracy of the resulting measurement results is favorably influenced. Preferably, at least three rope elements are provided, their profiles instantaneous poles form on a line that runs parallel to the plane and the Rotary axis at right angles with distance crosses, are arranged. Here, the arrangement be taken so that the rope elements V-shaped toward each other are arranged. This arrangement causes the rope elements an alignment the measuring roller to the cast strand such that the axis of rotation perpendicular to Casting direction sets. As a result, the wear of the measuring rollers due to the "clean" rolling at greatly reduced shear forces reduced and the roller life increased accordingly.

However, the moments that arise due to the interaction between the Measuring roller and Gießstrangoberfläche revealed to be able to record low, in particular, when the measuring roller is additionally driven, it is provided that the Rope elements and the at least one spring each with their axes at rest of the linear drive are arranged lying in planes that the job plane cross at right angles and run parallel to the axis of rotation. The springs are preserved a bias. Conveniently, an arrangement provided in the four rope elements each of which has two rope elements in one of two parallel planes are arranged, and arranged in the associated plane extending toward each other are. The axis of the at least one spring is preferably rectangular arranged standing on the standing plane. Convenient is when two groups of springs are provided, which are arranged in parallel planes. These cause a favorable force absorption and a practically frictionless guidance between the first Guide element and the second guide element.

In an embodiment of the invention, it is further provided that the measuring roller off the axis of rotation centered part rolls is formed.

Also favorable is an assignment of the arrangement according to the invention to the upper frame a continuous casting plant, in which the upper frame itself to the associated Subframe by means of power drive approachable or moved away from this to For example, an adjustment to each other to Dickeneinregelung the cast strand to make or the upper frame closer to the subframe when starting to be approached by means of a Anfahrstranges. Especially for the Retrofit in continuous casting, in which the upper frame in its position a subframe is fixed in a fixed position, i. is also provided for, that the second guide element on a provided with guide rollers Upper frame of a strand guide assembly for the casting strand of a continuous casting plant is movably arranged in the plane of the digit. The actuator engages on the one hand on the upper frame and on the other hand on the second guide element. A Strand guide for a continuous casting plant, in which the upper frame to the subframe is adjustable by means of hydraulic cylinders, is for example in EP 0 963 263 B1 described.

A preferred embodiment of the invention is schematically in the drawing shown.

Fig. 1

schematisch eine Draufsicht auf einen Oberrahmen mit einer erfindungsgemäßen Anordnung,

Fig. 2

einen Schnitt II-II durch Fig. 1,

Fig. 3

eine Darstellung, halb geschnitten, halb in Ansicht, wobei der Schnitt durch die erste Ebene geführt ist, und in Fig. 2 mit III-III bezeichnet ist, und die Darstellung im vergrößerten Maßstab im Verhältnis zu Fig. 2 gezeichnet ist

Fig. 4

eine Darstellung ähnlich Fig. 3, wobei jedoch der Schnitt durch die zweite Ebene geführt ist, und in Fig. 2 mit IV-IV bezeichnet ist, und die Darstellung im vergrößerten Maßstab im Verhältnis zu Fig. 2 gezeichnet ist.

Fig. 5

einen Schnitt V-V gemäß Fig. 2,

Fig. 6

einen Schnitt VI-VI gemäß Fig. 2 und

Fig. 7

eine Prinzipdarstellung bezüglich der Anordnung und Ausrichtung der Seilelemente.

It shows

Fig. 1

1 is a schematic plan view of a top frame with an arrangement according to the invention;

Fig. 2

a section II-II through Fig. 1,

Fig. 3

a representation, half-cut, half in view, wherein the section is guided by the first plane, and is designated in Fig. 2 with III-III, and the representation is drawn on an enlarged scale in relation to FIG

Fig. 4

a representation similar to FIG. 3, but wherein the section is guided through the second plane, and is designated in Fig. 2 with IV-IV, and the representation in an enlarged scale in relation to Fig. 2 is drawn.

Fig. 5

a section VV of FIG. 2,

Fig. 6

a section VI-VI of FIG. 2 and

Fig. 7

a schematic representation of the arrangement and orientation of the rope elements.

From Fig. 1 is a plan view of a top frame 1 for the strand guide a Continuous casting plant can be seen. The upper frame 1 has several parallel to each other arranged trusses 2, which at their lateral ends on spars with each other are connected. Between the two inner traverses 2 is a measuring roller unit 4, which is linearly adjustable in a plane which is perpendicular to the sheet plane is arranged between the inner trusses 2, i. into the leaf level and can be moved out of this.

Hereinafter, the measuring roller unit 4 will be described in more detail with reference to the drawing figures 2 to 7 described. Here, Fig. 2 is a section II-II of Fig. 1 represents.

In Fig. 2 are schematically the support rollers 3 of the upper frame 1 opposite Subframe shown. Between which the trusses 2 lateral connecting Holmen of the upper frame 1 is the measuring roller unit 4 by means of sliding guides 13 in a plane which is parallel to the drawing plane of Fig. 2, linear adjustably guided, that is, the knife roller unit 4 can on the support rollers 3 to or be moved away from these, around the resting on the support rollers 3 cast strand 5 to act on.

The measuring roller unit 4 comprises the measuring roller 6, which around the rotation axis 7, in the Set level S is arranged, is rotatable. The measuring roller 6 is about the rotation axis 7 at a first guide element 11, that in particular from FIGS. 3 to 6 can be seen is stored above camp 10. Preferably, the measuring roller 6 is drivable to the Outer contour of the measuring roller 6 is facing away from the support rollers 3 surface the casting strand 5 can be brought into contact and indeed force and / or path controlled. For this is the first guide member 11 in a frame-like enclosing this second guide member 12 in the set plane S by means of two as a hydraulic cylinder designed actuators 14 linearly movable. These actuators 14 can over a hydraulic circuit, not shown, pressure and / or driven away controlled be, so that there is a corresponding adjustment of the measuring roller 6. The measuring roller 6 is otherwise made of two centered on the axis of rotation 7 part rollers formed, which laterally connect to the bearings 10. The measuring roller 6 forms first longitudinal end 8 and second longitudinal end 9. The two actuators 14 are In addition, connected to a circuit in a known method, for. B. electro-hydraulic, can be designed.

The two actuating units 14 are based on the one hand on the first guide member 11th and on the other hand on the second guide element 11 enclosing the first Guide element 12 from. It can be seen in particular in FIG. 2 that the two Actuators 14 are each arranged to a longitudinal end 8 and 9 out. hereby For example, the measurement signals for the two actuation units 14 can be recorded separately and evaluated, so that the condition of the cast strand in the area can be detected individually to the two longitudinal ends 8,9 out.

The second guide element 12 is between the two inner trusses 2 and the connecting them Holmen guided by the sliding guide 13. Further can the measuring roller 6, which also by a rotary drive, not shown around the Rotary shaft 7 may be driven in rotation, from the position shown opposite the support rollers 3 in a position further approximated by an actuator 15 are adjusted in the form of a hydraulic cylinder, this one hand on the second guide element 12 and on the other hand on the adjacent trusses 2, between which the second guide element 12 is arranged linearly adjustable, is supported.

This approach is desired, for example, when delivering to a starter train to start when starting the casting process. The two actuators 14 are designed only in their linear movement so that the for the measurement required force or path controlled movement are carried out in terms of size can. However, such movements are in the range of ± 0.2 mm ± 5 mm.

The arrangement of the first guide element 11 in relation to the second guide element 12, by which it is enclosed, arises in particular in context with the Fig. 3 to 7, wherein in these the actuating units 14 and the actuator 15 are not shown. Moreover, in the event that the use of the The measuring roller unit 4 according to the invention is intended to be used in a continuous casting plant the top frame against the subframe sufficient for starting can be adjusted to dispense with the arrangement of the actuator 15. In In this case, the second guide member 12 part of the upper frame be formed, for example, by traverses thereof. In this case will the first guide element with respect to this, the second guide member 12th form, as arranged below in connection with FIGS. 2 to 7, but in particular Figs. 3-7 is described.

The two actuation units 14 according to FIG. 2 serve to illustrate that shown in FIGS. 3 to 6 first guide member 11 relative to the second guide member 12 in to adjust the setting plane S linear means of actuators, not shown there. The first guide element 11 is opposite to the second guide element 12 held as described below, so that practically a frictionless Movement is possible.

There are a total of four rope elements 16 are provided, of which two rope elements arranged in a plane. The first level E1 is through the Sectional plane corresponding to the section line III-III of Fig. 2 formed. The second level E2 is formed by the sectional plane along section line IV of FIG. 2 and is in FIG Fig. 4 shown. The drawing plane of FIG. 3 thus forms the first plane E1 and Drawing plane of Fig. 4, the second level E2. In Fig. 3, each cable element is the 16th passed through a bore in the first guide member 12 and by means of a first Fixing element 17 fixed to the first guide member 11. Every rope element 16 is further provided with a second fastener 18 on the second guide member 12 fixed, wherein the length of the cable element 16 is sized, that no contact between the first guide member 11 and the second guide member 12, which surrounds the first guide member 11 is given. The rope axis the rope elements 16 are each denoted by 19. Of the two in the plane E1 rope elements 16 shown, the second is shown only with the cable axis 19. Further, in the plane E1 is an arrangement which, as shown in FIG. 2 in connection with Fig. 3, still a spring 20 includes, designed as a compression spring is and whose axis 21 lies in the planes E1. The spring 20 is supported by a Cover 22 on the second guide member 12 and sits in a bore 27th of the second guide element 12. Located in the first guide element 11 a stepped through hole 25 in a support pot 23 with a collar 24 is held axially. At the bottom 26 of the support pot 23, the spring is supported 20 off with their other end. The arrangement is such that the spring 20 the cable element 16 claimed to train, whereby the first guide member 11th is kept free of investment in the second guide member 12. In the first levels E1 So there are a total of two rope elements 16 and two arrangements with springs 20 symmetrical to a plane E3 perpendicular to the plane S is arranged. The spring axis 21 extends at right angles to the position plane S.

As can be seen from FIG. 7 as a schematic diagram, the two cable shafts 19 at an angle such that, for example, the extensions of the cable shafts 19 at the intersection with the imaginary plane E3 each form a momentary pole P1. The two rope elements located in the plane E1 intersect with their cable axes 19 the plane E3 against the casting direction G to the axis of rotation 7 of the measuring roller. 6 offset in the common instantaneous P1.

A similar arrangement is with respect to the cable elements 16 and the spring 20 for however, a total of four spring arrangements are formed in the second plane E2 this level are provided. Otherwise, two rope elements with cable axles 19 arranged in this plane E2. And according to the arrangement in the plane E1, but the two cable axes 19, the imaginary plane E3 in a common Momentary pole P2 cut to the instantaneous pole P1 is offset. The Momentanpole P1, P2, the cable axles 19 are associated, in different Layers E1 and E2 are located on a line L, which lies in the plane E3 and the Rotary axis 7 of the measuring roller 6 perpendicularly intersects at a distance. By this arrangement is achieved that the measuring roller unit 4 laterally automatically (centric) at Contact with the casting strand 5 is aligned, causing a perfect rolling the measuring roller 6 is given on the cast strand 5.

Alignment is achieved when with any number of cable element assemblies all momentary poles, also arranged in different levels Rope elements, albeit offset in height on a line L, whose course described above is to be determined constructively.

The training with a total of four spring arrangements in the field of E2 level and two spring arrangements in the region of the plane E1 is taken, for example Moments that are generated via the contact of the measuring roller 6 with the cast strand 5, intercept.

The arrangement of the cable elements 16 and the springs 20 is shown in Fig. 4 in the second Level E2 mirror image in relation to the arrangement of FIG. 3 in the plane Hit E3. That while the springs 20 in the first plane E1, the first guide element 11 act in the casting direction G, the arrangement is carried out in the second plane E2 so that the application of the springs 20 against the Casting is given.

LIST OF REFERENCE NUMBERS

1

top frame

2

traverse

3

support rollers

4

Measuring roller unit

5

cast strand

6

measuring roller

7

axis of rotation

8th

first longitudinal end

9

second longitudinal end

10

camp

11

first guide element

12

second guide element

13

slide

14

Actuator / linear drive

15

actuator

16

cable element

17

first fastening element

18

second fastening element

19

cable axis

20

feather

21

Axis of the spring

22

cover

23

support pot

24

collar

25

Bore in the first guide element

26

ground

27

Bore in the second guide element

E1

first level (= section plane III - III)

E2

second level (= section plane IV - IV)

E3

imaginary plane

G

casting

L

line

S

actuating plane

P1

instantaneous

P2

instantaneous

Claims (16)

Arrangement for determining the consistency of a cast strand (5) in a continuous casting plant and / or the mouth width thereof a measuring roller (6),
which can be brought into contact with the casting strand (5) and has a first longitudinal end (8) and a second longitudinal end (9) and an axis of rotation (7), a first guide element (11),
on which the measuring roller (6) is rotatably mounted about the axis of rotation (7), a second guide element (12),
in relation to which the first guide element (11) is movably guided along a positional plane (S) which contains the axis of rotation (7), and a linear drive (14), which engages the first guide element (11) and the second guide element (12) and by means of which the measuring roller (6) can be brought into contact with the cast strand (5) in a force-controlled and / or path-controlled manner along the placement plane (S). Arrangement according to claim 1,
characterized in that the linear drive comprises two actuating units (14) which respectively engage near the longitudinal ends (8, 9) of the measuring roller (6) on the first guide element (11) and both individually and jointly for transmitting a linear movement to the first guide element (11) serve. Arrangement according to claim 1,
characterized in that a hydraulic linear drive is provided as the linear drive (14). Arrangement according to claim 2,
characterized in that the linear actuator forming two actuating units (14) are designed as hydraulic cylinders. Arrangement according to claim 1,
characterized in that in addition the second guide element (12) by an actuator (15) is adjustable at least between two positions in the set plane (S). Arrangement according to claim 5,
characterized in that the actuator (15) is represented by a hydraulic cylinder. Arrangement according to claim 1,
characterized in that the second guide element (12) surrounds the first guide element (11) like a frame,
in that the first guide element (11) is connected to the second guide element (12) without installation by at least two cable elements (16) and
in that the first guide element (11) is acted upon by at least one spring (20) supported on the second guide element (12) in such a way that the cable elements (19) are subjected to tension. Arrangement according to claim 7,
characterized in that at least three rope elements (16) are provided, the courses of which form instantaneous poles (P1, P2) arranged on a line (L) which runs parallel to the positioning plane (S) and crosses the axis of rotation (7) at a right angle are. Arrangement according to one of claims 7 or 8
characterized in that the cable elements (16) and the at least one spring (20) each with their axes (19, or 21) are arranged in the resting state of the linear drive (14) in planes (E1, E2), the set plane ( S) cross at right angles and run parallel to the axis of rotation (7). Arrangement according to claim 9,
characterized in that four cable elements (16) are provided, of which in each case two cable elements (16) are arranged in one of two parallel planes (E1, E2), and which are arranged in the associated plane (E1, E2) running towards each other , Arrangement according to claim 7,
characterized in that the axis (21) of the at least one spring (20) is perpendicular to the actuating plane (S). Arrangement according to claim 7,
characterized in that two groups of springs (20) are provided, which are arranged in parallel planes (E1, E2). Arrangement according to claim 1,
characterized in that the measuring roller (6) about the rotation axis (7) is rotationally driven. Arrangement according to claim 1,
characterized in that the measuring roller (6) is formed on the rotation axis (7) centered part rollers. Arrangement according to claim 1,
characterized in that the second guide element (12) is an integral part of an upper frame provided with guide rollers of a strand guide assembly for the casting strand of a continuous casting, wherein the upper frame itself is approachable to an associated subframe by means of power drive or movable away from it. Arrangement according to claim 5,
characterized in that the second guide element (12) on a provided with guide rollers upper frame (1) of a strand guide assembly for the casting strand of a continuous casting in the placement plane (S) is movably arranged, wherein the actuator (15) on the one hand on the upper frame (1) and on the other on the second guide element (12) engages.

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