JPS61132246A - Strand guide apparatus for continuous casting plant - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a strand guide for a continuous casting plant, and more particularly to a continuous casting plant for cast steel strands with a slab cross-section, for supporting the strands and preventing disordered guidance. each roller having a space through which the coolant flow passes, the space being connected to a coolant supply duct and a coolant discharge duct;
The coolant discharge pipe is arranged in line with at least one of the tuyere or set of tuyeres of the external cooling means in a duct-like manner.

BACKGROUND OF THE INVENTION From US Pat. No. 3,766,968 a strand guide is known which consists of an external cooling device constituted by flat jet tuyeres arranged parallel to the surface of the strand and at a distance. These tuyeres have the effect, if necessary, of cooling the roller surface facing the strand surface as well as of the strand surface itself and of washing off scales occurring on the strand surface.

From DE 2 552 969, supporting strands with internal cooling for the purpose of balancing the temperature differences between the shaft, bearing and roller cover.

It is known to provide one guiding roller, the internal cooling of which is provided by a splash cooler.
Designed as an external cooler, it is operated independently of the cooling.

Modern high-volume continuous casting plants, especially high-speed continuous casting plants, require particularly effective cooling of the plant parts as well as the strands. Thus, there has been a trend to provide both external and internal cooling means on the rollers that support and guide the strands. The combination of external and internal cooling means for the rollers involves significant construction costs due to the required plumbing. Furthermore, in order to avoid that the two automatic controls influence each other, complex control means must be provided (independent measuring and control devices for the automatic control of the two cooling means).

A strand guide of the first mentioned type is also known from Austrian patent no. It is injected into the space provided in the extension of the. This Australian patent aims to prevent the return of coolant at the end of the shaft where the coolant enters.

OBJECTS OF THE INVENTION The present invention has been made to avoid these disadvantages and difficulties and provides a strand of the first-mentioned type which combines the advantages of external cooling means of the rollers with those of internal cooling means, both without disadvantages. In particular, the strand guide according to the invention, characterized in that it provides a guide, is one that is designed in the simplest manner from the point of view of construction and control operation.

DISCLOSURE OF THE INVENTION This object is achieved by the present invention, in which one roller is provided between each roller.
Each tuyere or set of tuyeres is provided adjacent to one end of the roller containing the coolant discharge duct, and the injection direction of the tuyere or set of tuyere is , is achieved by providing an external cooling means that is opposite to the flow direction of the coolant through the rollers. The combination of external cooling means and roller internal cooling not only results in considerable savings in piping work, but also provides the advantage that a single measurement and control loop is satisfied.

In order to cool the rollers arranged in the outer arc of the arc-shaped strand guide, the coolant discharge ducts of the rollers are preferably connected with two tuyeres or a series of tuyere fleas. Of the ports, one is located in front of the rollers as seen in the direction of strand withdrawal;
Another tuyere is placed behind the roller. This type of strand guide provides a good cooling effect of the plant parts to be cooled and, if desired, of the strand surfaces, despite the flow of coolant due to gravity.

In order to achieve the most uniform cooling of the strand surface by means of chilled rollers and external cooling means, a coolant supply duct adjacent to the rollers is advantageously provided on the opposite side of the strand guide, and a coolant discharge duct adjacent to the respective roller. provided at the opposite end of the

DESCRIPTION OF THE DRAWINGS The present invention will now be described in more detail with reference to the accompanying drawings.

In the drawings, FIG. 1 is a sectional view of one specific example of the strand guide according to the present invention.

FIG. 2 is a sectional view of another embodiment similar to the strand guide of FIG. 1.

3 and 4 are plan views of the radially inner arc and outer arc of the strand guide, respectively.

EXAMPLE Continuously, the cast slab 1 rests on a roller 2, the outer shell of which is supported by the roller. The roller 2 consists of an equally replaceable roller body 3 held by fastening anchors 4. Each of the roller bodies 3 is stepped at one end 5 to form a bearing support shaft 6 supported by a bearing 7. The mutual axis alignment of the roller body 3 is achieved by a central recess 8 on one front side and a protrusion 9 that fits into this recess on the opposite front side of the roller body 3).
It is secured from this.

Internal cooling of the rollers 2 is provided via coolant supply ducts 10 on one end 11 of each roller 2 to the space 12 around the fastening anchors 4, and by means of coolant on the opposite end 14 of the rollers. This is done by discharging through a discharge duct. The connection between the coolant supply duct 10, the coolant discharge duct 13 and the rollers 2 is effected by rotary joints 15 and 16, respectively.

The coolant discharge duct 13 is deflected by 180° in the immediate vicinity of the roller end 14 , with its end provided with at least one tuyere 17 pointing in the direction of the opposite roller end 11 and directed toward the axis of the roller 2 . It is made to be parallel to. In this way, the coolant jet 18 exiting the tuyere 17 is used for external cooling of the roller 2 as well as for cooling the strand surface 19 in contact with the roller 2.

In order to prevent the coolant discharge duct 13, together with the rollers 2, from changing direction, a console 16' supporting the coolant discharge duct 13 is fixed to a fixed stand part of the continuous casting plant.

According to the example shown in FIG. 2, the roller shaft 20 is fixed to a support structure (not shown) via a shaft support 21. As shown in FIG. A cylindrical roller main body 22 is arranged between two Am shaft support stands 21, and each roller main body is
It is mounted on the roller shaft 20 by bearings 23 at its ends. Outside: The main body of the roller facing away is Patsukin 2.
It is sealed by a sealing board 24 into which a number 5 is inserted.

The inner diameter of the roller main body 22 is larger than the outer diameter of the roller shaft 2o, and an annular space 26 is formed.

The roller shaft 2 has one shaft hole 27 passing through it, and is connected to the annular spaces 26 via vertical holes 28 and 29.

The coolant is guided into the shaft hole 27 through the coolant supply duct 10 on one end 11 of the roller 2 . Vertical hole 28
The axial hole 27 is located between the vertical holes 28 and 29 in the annular space 26 in order to return the coolant to the annular space 26 through the annular space 26 and from there to the axial hole 27 through the vertical hole 29. It is closed by a pin 30 of. This tortuous flow path is provided by each successive roller body 22).

The bearing 23 is sealed against the space 26.

At the opposite end 14 of the roller 2, coolant is injected into the coolant discharge duct 13 via the shaft hole 27.

In this example as well, the end of the coolant discharge duct 13 is deflected by 180° toward the opposite roller end 11 immediately adjacent to the roller end 14, and is provided with a tuyere. Coolant is injected in the form of a coolant jet 18 . In this specific example, it is fixed to a roller shaft 20 that does not rotate.

There is no need to support the coolant discharge duct in the stand section of the continuous casting plant.

FIG. 3 shows nozzles 17 arranged alternately opposite the ends of adjacent rollers 2, so that all tuyeres 17, seen from the drawing direction of the strand, are located on the attached roller 2. (behind) is located here. From this arrangement, a coolant jet 18 is injected between adjacent rollers 2 and discharged to the opposite end of the roller 2 with continuous tuyeres. This causes the coolant jets 18 to flush each roller in one direction on one jacket side 32 and in the opposite direction on the other jacket side 33, and alternately flush the strand surface 19 from the opposite side. . This arrangement is particularly suitable for cooling the rollers 2 of the inner arc of the strand guide.

In order to prevent the coolant on the outer plate of the strand guide from rapidly flowing down, a T-shaped part 34 is inserted into each coolant discharge duct 13i directly above one end 14 of the roller as shown in FIG. Two ducts deflected and provided with tuyeres 17 are connected to the coolant discharge duct 13) of each roller 2, one tuyere being connected to the other in front of the associated roller 2 as seen in the drawing direction of the strands. One is arranged at the rear.

By means of the coolant discharge ducts 13 provided at the opposite ends of the adjacent rollers 2, two mutually oppositely directed coolant jets 18 are created between the adjacent rollers 2, resulting in a sharp drop-off of the coolant). This satisfies the requirement for a large amount of cooling material on the outside plate of the strand guide.

The present invention is not limited to the specific examples shown in the drawings, but can be modified in various ways. For example, a coolant supply duct and a coolant discharge duct, as well as external cooling tuyeres of the roller, can be provided at the same end of the roller to direct the coolant inside the roller. Instead of individual tuyeres 17, a set of tuyeres can be provided, especially if the roller axial length is larger.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one specific example of the strand guide of the present invention, FIG. 2 is a sectional view of another specific example, and FIGS. 3 and 4 respectively show the radially inner arc 2 and FIG. 3 is a plan view of the outer arc; The main symbols in the drawings have the following meanings. DESCRIPTION OF SYMBOLS 1... Slab, 2... Roller, 10... Coolant supply duct, 13... Coolant discharge duct, 17...
Tuyere, 18... Coolant jet special liver applicant Hoesto Alpin Akteengesellschaft attorney Patent attorney Aoyama and 2 others
Name FIG, I FIG, 2

Claims (1)

[Claims] 1. Roller (2) that supports and guides the strand
, and each roller has a space (
12, 26), one of which has a coolant supply duct (10)
The other end is connected to the coolant discharge duct (13), and the coolant discharge pipe (13) is connected to the tuyere (1) of the external cooling means.
7) Or a strand guide for a continuous casting plant, in particular for a cast steel strand (1) with a slab cross-section, arranged in line with at least one of a set of tuyeres by duct-like means, The external cooling means consists of a tuyere (17) or a series of tuyeres arranged between the rollers (2), each tuyere (17) or set of tuyere containing a coolant discharge duct (13). 2) is arranged adjacent to the end (14) of the tuyeres (17) or 1
The injection direction of each tuyere of the set of tuyeres is
) A strand guide for a continuous casting plant, characterized in that it is oriented in a direction opposite to the flow direction of the coolant passing through it. 2. The coolant discharge duct (13) of the roller (2) is connected to two tuyeres (17) or a series of tuyeres, and when viewed from the strand drawing direction, one tuyere (17) or one set of nozzles Strand guide according to item 1 above, characterized in that a tuyere (17) or a set of tuyeres is arranged at the front and one tuyere (17) or one set of tuyeres at the rear. 3. that the coolant supply duct (10) adjacent to each roller is arranged on the opposite side of the strand guide, and that the coolant discharge duct (13) is provided at the opposite end (14) of each roller (2); The strand guide according to item 1 or 2 above.