EP2830791B1 - Strand guiding element - Google Patents

Description

Field of engineering

The present invention relates to a strand guiding element for guiding a round strand in a continuous casting machine.

State of the art

From the DE 3443258 A1 is a strand guide member for supporting and guiding a round strand with three, each rotatably mounted, strand guide rollers known, wherein a roller on a fixed frame and two other rollers are each arranged on a movable frame. By the two movable frame, the strand guide rollers of the strand guide element can be made manually to different strand diameter. A disadvantage of this solution is that the strand guide element can not be automatically adapted to different strand diameter, and that when adjusting two strand guide rollers must be made separately.

How the strand guide element could be simplified, so that it is easy to automate, is not apparent from the font.

Other strand guide elements are off AT 367669B . US 4156453A . DE 1758398A1 . DE 102 18844 B3 and DE 10 2010 034399 A1 known.

Summary of the invention

The object of the invention is to overcome the disadvantages of the prior art and to present a structurally simple strand guide element for guiding a strand in a continuous casting machine, which can be automatically adapted to different strand sizes.

This object is achieved by a strand guide element according to claim 1. Advantageous embodiments are the subject he dependent claims.

• eine Traverse mit einem ersten Endbereich, einem Zwischenbereich und einem zweiten Endbereich, wobei im Zwischenbereich der Traverse zumindest eine erste Strangführungsrolle drehbar gelagert ist;
• eine erste Schwinge mit einem ersten Endbereich, einem Zwischenbereich und einem zweiten Endbereich, wobei im Zwischenbereich der ersten Schwinge eine zweite Strangführungsrolle drehbar gelagert ist und der zweite Endbereich der Traverse gelenkig mit dem ersten Endbereich der ersten Schwinge verbunden sind;
• eine zweite Schwinge mit einem ersten Endbereich, einem Zwischenbereich und einem zweiten Endbereich, wobei im Zwischenbereich der zweiten Schwinge eine dritte Strangführungsrolle drehbar gelagert ist und der erste Endbereich der Traverse gelenkig mit dem ersten Endbereich der zweiten Schwinge verbunden sind; und
• ein Linearmotor der jeweils mit dem zweiten Endbereich der ersten Schwinge und dem zweiten Endbereich der zweiten Schwinge gelenkig verbunden ist.

Specifically, the solution is carried out by a strand guiding element for guiding a round strand in a continuous casting machine, comprising

• a traverse having a first end region, an intermediate region and a second end region, wherein at least one first strand guide roll is rotatably mounted in the intermediate region of the traverse;
• a first rocker having a first end portion, an intermediate portion and a second end portion, wherein a second strand guide roller is rotatably supported in the intermediate region of the first rocker and the second end portion of the cross member is pivotally connected to the first end portion of the first rocker;
• a second rocker having a first end portion, an intermediate portion and a second end portion, wherein in the intermediate region of the second rocker, a third strand guide roller is rotatably mounted and the first end portion of the crossbar are pivotally connected to the first end portion of the second rocker; and
• a linear motor hingedly connected to each of the second end portion of the first rocker and the second end portion of the second rocker.

By this design, a strand guide element is formed with only a single formed as a linear motor Anstellelement, the strand guide rollers of the strand guide element can be easily and easily automated by the linear motor to the strand (for example, to different strand diameter) can be employed. In addition, the contact force of the strand guide rollers to the strand can be easily adjusted by the extension or retraction of the linear motor, so that, for example, the holding force of the strand guide element, which acts on a strand in a vertical or oblique strand guide, easily adjusted can be. In the strand guide element according to the invention, the traverse with the two wings, and the two wings with the linear motor are each hinged together, whereby stresses in the strand guide element can be effectively avoided. Specifically, an intermediate region of the traverse, the first rocker and the second rocker is disposed between each of the first end portion and the first end portion.

For a triangular and hexagonal strand, it is advantageous if in the intermediate region of the traverse exactly one first strand guide roller is rotatably mounted, so that each two adjacent strand guide rollers have an angle of 120 ° to each other. Thus, ideally, the three strand guide rollers at an angle of 120 ° to each other. As a result, the strand is guided centrally; In addition, this results in only low tensile stresses in the strand, which has a positive effect on the internal quality.

Alternatively, it is advantageous for a rectangular, in particular square, or octagonal strand, if two first strand guide rollers are rotatably mounted in the intermediate region of the traverse, so that each two adjacent strand guide rollers have an angle of 90 ° to each other. Thus, in the ideal case, the four strand guide rollers at an angle of 90 ° to each other. As a result, the strand is guided centrally; In addition, this in turn result in only low tensile stresses in the strand, which has a positive effect on the internal quality.

In order to minimize the surface pressure of a strand guide roll on the lateral surface of the strand, it is advantageous if a strand guide roll is a concave, i. has inwardly curved side surface.

In order to be able to apply the greatest possible force to the strand, it is advantageous if at least one strand guide roll, preferably all strand guide rolls of the strand Strand guide element, is connected to a rotary drive for driving the strand guide roller.

For the robustness, it is advantageous if the linear motor is designed as a fluidbeaufschlagter cylinder, such as a hydraulic or pneumatic cylinder.

Alternatively, it is possible if the linear motor as an electric motor, e.g. as a Hubspindelantrieb is formed.

For a control or regulation of the position or the contact force of the strand guide rollers, it is advantageous if the linear motor has a displacement measuring device for measuring the displacement of the linear motor and / or a force measuring device for measuring the contact force of the linear motor.

In the embodiment in which the linear motor is designed as a fluid-loaded cylinder, it is advantageous if the force-measuring device is designed as a pressure measuring device for measuring the pressure in the fluid-loaded cylinder.

In the embodiment in which the linear motor is designed as an electric motor, it is advantageous if the force measuring device is designed as a current measuring device for measuring the current in the electric motor.

A self-centering strand guide with a fixed support structure and a strand guide element, the strand guide rollers are arranged in a plane can be formed when the strand guide element relative to the support structure in at least one direction, preferably in both directions, the plane is floating. As a result, the strand guiding element can center itself relative to the strand in at least one direction, preferably in both directions, of the plane.

It is particularly advantageous to arrange a plurality of strand guiding elements in a casting direction one behind the other, each strand guiding element being mounted in a floating manner relative to the stationary supporting structure. As a result, undesirable stresses in the strand are avoided on the one hand; On the other hand, the strand guide is not exposed to undesirable stresses, which has a positive effect on the life.

Brief description of the drawings

• Fig 1a...1c eine Draufsicht auf ein Strangführungselement mit drei Strangführungsrollen, das je einen runden, einen dreieckigen und einen sechseckigen Strang führt Fig 1d eine Draufsicht auf ein Strangführungselement mit vier Strangführungsrollen, das einen runden Strang führt
• Fig 2,3 je eine perspektivische Darstellung des Strangführungselements nach Fig 1a
• Fig 4,5 je eine perspektivische Darstellung einer Strangführung mit fünf Strangführungselementen
• Fig 6 eine Vorderansicht zu den Fig 4 und 5
• Fig 7,8 je eine Draufsicht auf zwei Ausführungsformen einer Strangführung mit einem Strangführungselement nach Fig 1a und einer feststehenden Stützkonstruktion

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

• Fig 1a ... 1c a plan view of a strand guide element with three strand guide rollers, which each leads a round, a triangular and a hexagonal strand Fig. 1d a plan view of a strand guide element with four strand guide rollers, which leads a round strand
• Fig. 2,3 depending on a perspective view of the strand guide element Fig. 1a
• Fig. 4 . 5 each a perspective view of a strand guide with five strand guide elements
• Fig. 6 a front view to the Fig. 4 and 5
• Fig. 7,8 depending on a plan view of two embodiments of a strand guide with a strand guide element Fig. 1a and a fixed support structure

Description of the embodiments

The Fig 1a ... 1c show a first embodiment of the strand guide element 1 with three strand guide rollers 6,7,8, which is used for guiding and supporting a steel strand 2. Specifically, the strand guide element 1 a fixed cross member 3, a first rocker 4 and a second rocker 5; Traverse 3 as well as first and second rocker arms 4,5 each comprise a first end portion 3a, 4a, 5a, a second end portion 3c, 4c, 5c and an intermediate portion 3b, 4b, 5b therebetween. The end portions 3a, 3c of the traverse 3 are each connected via a joint with a first rocker 4 and a second rocker 5 movably connected. In the intermediate regions 3b, 4b, 5b of the traverse 3, the first rocker 4 and the second rocker 5 are each a first, second and third strand guide roller 6, 8 and 9 rotatably mounted. In the illustrations, two adjacent strand guide rollers, eg 6 and 8, 8 and 9, or 6 and 9, each have an angle of 120 ° to each other. As a result, the strand 2 is guided centrally, which has a positive effect on the internal quality of the strand. Specifically, the strand guide rollers are 6,8,9 as non-driven rollers, engl. idle rolls, executed. Nevertheless, it would be possible, one or preferably all three strand guide rollers driven as so-called. Design drive rollers. For this purpose, the person skilled in the art from the prior art sufficiently suitable drives are known. The articulated connections between the traverse 3 and the two wings 4, 5 via a respective pivot, which has a continuous axis 13. For this purpose, each end region 3a, 3c of the cross member 3 has a through hole for receiving an axle 13. In addition, each end region 3a, 3c of the traverse 3 has a recess for receiving an end region 4a, 5a of a rocker 4, 5. By this design, the forces are centrally introduced from the cross member 3 in the wings 4, 5 and vice versa. Also designed as a hydraulic cylinder linear motor 10 is hingedly connected to the end portions 4c, 5c of the two wings. The strand guide rollers 6,8,9 have a concave, ie inwardly curved, curvature of the lateral surface, so that it comes between a strand guide roller and the strand 2 to a line contact. As a result, the Hertzian pressure is reduced at the same load or the transferable forces can be substantially increased by a strand guide roller on the strand 2.

The FIGS. 1b and 1c show the use of the strand guide element 1 after Fig. 1a to support a triangular or hexagonal strand 2.

The Fig. 1d shows a schematic representation of a strand guide element 1 with four strand guide rollers 6,7,8,9. The difference to the strand guide element with three strand guide rollers according to Fig 1a ... 1c consists in that in the intermediate region 3b of the traverse 3, two first strand guide rollers 6.7 are arranged. In addition, two adjacent strand guide rollers 6 ... 9 at an angle of 90 ° to each other. This embodiment is particularly suitable for round, rectangular (in particular square) and octagonal strand cross-sections.

The FIGS. 2 and 3 show two perspective views of the strand guide element Fig. 1a ,

• Gemäß Fig 7 ist ein Strangführungselement 1 nach Fig 1a im Inneren eines Rahmens einer feststehenden Stützkonstruktion 11 angeordnet und bezüglich der Stützkonstruktion über vier Paare von Federn 14 bzw anderen elastischen Elementen verschieblich angeordnet; die Freiheitsgrade der Verschiebungen sind durch Pfeile dargestellt. Durch diese Anordnung kann sich das Strangführungselement 1 mit dem Strang 2 verschieben, sodass mittels des Linearmotors 10 der Strang 2 durch die Strangführungsrollen 6...8 nur im gewünschten Ausmaß geklemmt bzw. ausgezogen wird.

The FIGS. 7 and 8 show two possibilities how a self-centering strand guide can be built up:

• According to Fig. 7 is a strand guide element 1 after Fig. 1a arranged inside a frame of a fixed support structure 11 and slidably disposed with respect to the support structure via four pairs of springs 14 and other elastic elements; the degrees of freedom of the displacements are indicated by arrows. By this arrangement, the strand guide element 1 can move with the strand 2, so that by means of the linear motor 10 of the strand 2 is clamped or pulled out by the strand guide rollers 6 ... 8 only to the extent desired.

In Fig. 8 is one too Fig. 7 alternative construction of a self-centering strand guide shown. Again, the strand guide element 1 is disposed within the fixed support structure 11, but with the strand guide element 1 as it were in a through the fixed support structure 11 formed link guide is performed. The degrees of freedom of the possible displacements are again represented by arrows.

The Fig. 4 . 5 and 6 show different views of a strand guide with five strand guiding elements 1. Specifically, the strand guiding elements 1 are arranged one above the other in the casting direction 12. Via the linear motors 10, each strand guiding element 1 can exert a defined clamping force on the strand 2, so that the cross section of the strand 2 can be reduced by the strand guiding elements 1 following in the casting direction 12 (for example by a so-called soft core or liquid core reduction). ,

While the invention has been further illustrated and described in detail by the preferred embodiments, the invention is not limited by the disclosed examples, and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

LIST OF REFERENCE NUMBERS

1

Strand guiding element

2

strand

3

traverse

3a

first end of the traverse

3b

Intermediate area of the traverse

3c

second end of the traverse

4

first swingarm

4a

first end of the first rocker

4b

Intermediate area of the first swingarm

4c

second end of the first rocker

5

second swingarm

5a

first end of the second rocker

5b

Intermediate area of the second swingarm

5c

second end of the second rocker

6, 7

first strand guide roller

8th

second strand guide roller

9

third strand guide roller

10

linear motor

11

fixed supporting structure

12

casting

13

axis

14

feather

Claims (12)

1. Strand guiding element (1) for guiding a round strand (2) in a continuous casting machine, characterized by

   - a cross-beam (3) with a first end region (3a), an intermediate region (3b), and a second end region (3c), at least one first strand guiding roller (6, 7) being rotatably mounted in the intermediate region of the cross-beam (3b);

   - a first rocker (4) with a first end region (4a), an intermediate region (4b) and a second end region (4c), wherein a second strand guiding roller (8) is rotatably mounted in the intermediate region of the first rocker (4b) and the second end region of the cross-beam (3c) is connected in an articulated manner to the first end region of the first rocker (4a) ;

   - a second rocker (5) with a first end region (5a), an intermediate region (5b), and a second end region (5c), wherein a third strand guiding roller (9) is rotatably mounted in the intermediate region of the second rocker (5b) and the first end region of the cross-beam (3a) is connected in an articulated manner to the first end region of the second rocker (5a);

   - a linear motor (10), which is connected in an articulated manner to both the second end region of the first rocker (4c) and the second end region of the second rocker (5c) .
2. Strand guiding element (1) according to Claim 1 for guiding a triangular and hexagonal strand (2) in a continuous casting machine, characterized in that precisely one first strand guiding roller (6) is rotatably mounted in the intermediate region of the cross-beam (3b), wherein every two adjacent strand guiding rollers (6, 8, 9) are at an angle of 120° in relation to one another.
3. Strand guiding element (1) according to Claim 1 for guiding a rectangular, in particular square, or octagonal strand (2) in a continuous casting machine, characterized in that two first strand guiding rollers (6, 7) are rotatably mounted in the intermediate region of the cross-beam (3b), wherein every two adjacent strand guiding rollers (6, 7, 8, 9) are at an angle of 90° in relation to one another.
4. Strand guiding element according to one of Claims 1 to 3, characterized in that a strand guiding roller (6...9) has a concavely curved lateral surface.
5. Strand guiding element according to one of Claims 1 to 4, characterized in that at least one strand guiding roller (6...9), preferably all the strand guiding rollers (6...9), is/are connected to a rotary drive for driving the strand guiding roller (6...9).
6. Strand guiding element according to one of Claims 1 to 5, characterized in that the linear motor (10) is formed as a fluid-actuated cylinder.
7. Strand guiding element according to one of Claims 1 to 5, characterized in that the linear motor (10) is formed as an electric motor.
8. Strand guiding element according to one of the preceding claims, characterized in that the linear motor (10) has a displacement measuring device for measuring the displacement of the linear motor (10) and/or a force measuring device for measuring the adjusting force of the linear motor (10).
9. Strand guiding element according to Claim 8, characterized in that the force measuring device is formed as a pressure measuring device in the fluid-actuated cylinder.
10. Strand guiding element according to Claim 8, characterized in that the force measuring device is formed as a current measuring device in the electric motor.
11. Strand guide with a fixed supporting structure (11) and a strand guiding element (1) according to one of the preceding claims, wherein the strand guiding rollers (6...9) of the strand guiding element (1) are arranged in one plane, characterized in that the strand guiding element (1) is mounted in a floating manner with respect to the supporting structure (11) in at least one direction, preferably in both directions, of the plane.
12. Strand guide according to Claim 11, characterized in that a number of strand guiding elements (1) are arranged one behind the other in a casting direction (12), wherein each strand guiding element (1) is mounted in a floating manner with respect to the fixed supporting structure (11).

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