JPH0243550Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a link type dummy bar for curved continuous casting.

[Prior Art] Conventionally, a link type dummy bar is configured to freely deform along a slab movement path, and the dummy bar end itself does not have a function to maintain a straight posture. For this reason, when used in a curved continuous casting machine, the dummy bar end is supported by a slab support such as a guide roll or a separate dummy bar guide at the position just before insertion into the mold, so that the end of the dummy bar can be inserted into the mold in a nearly vertical position. He held his position.

[Problem that the invention attempts to solve]

In a curved continuous casting machine, the slab movement path at the position just before insertion into the mold is a vertical section several meters directly below the mold and a near-vertical circular arc section, which is the most important cooling zone. However, conventionally, slab supports and dummy bar guides are provided to guide the ends of the dummy bar, which prevent uniform cooling of the slab, causing cracks in the slab, which poses quality problems, and leads to breakage. There was an inconvenience in that it could cause outs to occur.

By the way, when the slab size becomes smaller, the slab support can be omitted because the static pressure of the molten metal inside the slab can be maintained by the formed solidification shell itself. Furthermore, if a fall prevention mechanism could be built into the dummy bar end itself, the dummy bar guide could also be omitted.

[Purpose of invention]

This invention was made in order to solve the above problem from this point of view, and the dummy bar end is designed to be inserted into a nearly vertical position immediately before insertion into the mold without the need for a slab support or dummy bar guide. The purpose is to provide a self-straightening mechanism to the

[Means to solve the problem]

The link-type dummy bar for curved continuous casting of this invention has one of the adjacent links at the end of the dummy bar located at the vertical part directly below the mold of the slab movement path and at the near-vertical arc part immediately before insertion into the mold. A link locking protrusion is provided on the link, and the other link is
A link locking recess with which the link locking projection engages is provided at a position away from the link rotation center, and a pair of opposing surfaces of the link locking recess that face each other across the link locking projection hold the link locking projection with a dummy bar. The dummy bar is formed to be movable as the end portion is deformed, and one opposing surface is formed to be able to abut a link stopper projection when the end of the dummy bar becomes straight, and is provided with the link stopper recess. The link is provided with a spring that is compressed by the link locking protrusion when the end of the dummy bar is bent, and the reaction force of the compressed spring moves the link locking protrusion to the side that abuts the one opposing surface of the link locking recess. The present invention is characterized in that it is provided with a dummy bar straight holding mechanism that presses the dummy bar, and this configuration achieves the above object.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a link, and projecting pieces 2 and 3 extending in opposite directions are provided at both ends of the link 1.

Each adjacent link 1A, 1B is connected by a connecting pin 4 at the intermediate part of the protruding pieces 2, 3 with the protruding piece 2 fitted between the protruding pieces 3, and can be connected in both directions or in one direction around the connecting pin 4. It can be rotated in any direction.

Reference numeral 5 designates a dummy bar head, and one end of the dummy bar head 5 is provided with a slab connecting portion 6, and the other end is provided with a projecting piece 3'.

The link 1A adjacent to this dummy head 5 is
With the protruding piece 2 fitted between the protruding pieces 3', the protruding piece 2,
3' are connected by a connecting pin 4' at the intermediate portion thereof, and are rotatable in both directions or in one direction around the connecting pin 4'.

This idea is based on the above dummy bar.
Just before inserting the slab into the mold 9, the slab moving path 10
Projecting pieces 3, 3' of one of the links 1, 5 of the adjacent links at the end of the dummy bar located in the vertical part directly below the mold and the nearly vertical arc part (range S shown in Fig. 1) A link locking protrusion 7 is provided at the end,
A link locking recess 8 with which the link locking protrusion 7 engages is provided at the tip of the protruding piece 2 of the other link 1 at a position away from the link rotation center (connecting pin 4). Link stopper protrusion 7
A pair of opposing surfaces a and b are formed so that the link locking protrusion 7 can be moved as the dummy bar end is deformed, and one opposing surface a is formed so that the link locking protrusion 7 can be moved when the dummy bar end becomes straight. The link locking projection 8 is formed so as to be able to come into contact with the rotation locking projection 7.
The link 1 is provided with a spring 13 that is compressed by the link locking protrusion 7 when the end of the dummy bar is bent, and the reaction force of the compressed spring 13 causes the link locking protrusion 7 to move into the link locking recess 8. The dummy bar is characterized by being provided with a dummy bar straight holding mechanism 14 that presses the side that comes into contact with one opposing surface a.

When the end of the dummy bar becomes straight, a gap C is created between the link locking protrusion 7 that is in contact with one opposing surface a of the link locking recess 8 and the other opposing surface b of the link locking recess 8. However, this gap C is caused by the fact that when the end of the dummy bar curves along the circular arc portion of the slab moving path 10, the link locking protrusion 7 comes into contact with the opposing surface b of the link locking recess 8, and the circular arc of the slab moving path 10 is created. It is adjusted so that you can take a posture that follows the body.

A liner 11 is attached to the link locking protrusion 7 on the side that comes into contact with the opposing surface a of the link locking recess 8.

The spring 13 has an opposing surface a of the link locking recess 8,
A pressing metal fitting 12 is attached to the tip of the protruding piece 2 of the link 1 by penetrating it so as to be movable along the direction in which b is opposed.
It is wound around the shaft portion of the press fitting 12 and interposed between the head of the pressing fitting 12 and the tip of the protruding piece 2 of the link 1.

In the above configuration, at the initial stage of dummy bar insertion,
Since a bending force acts on the end of the dummy bar from the circular arc part directly under the mold whose semi-curvature becomes smaller as it is inserted, the link locking protrusion 7 provided on one of the links 1 and 5
and a link rotation prevention recess 8 provided in the other link 1.
Since the link rotates around the link rotation center (connection pin 4) in the direction in which the facing surface b of the dummy bar contacts (the direction that compresses the spring 13), the dummy bar end curves, as shown in FIG. The section takes a posture along the circular arc section of the slab moving path 10 directly below the mold.

Furthermore, at the final stage of insertion of the dummy bar, the radius of curvature of the circular arc section directly below the mold increases as the dummy bar is inserted, and finally reaches the vertical section directly below the mold, causing the slab moving path 10
Since the bending force no longer acts on the dummy bar end,
Due to the reaction force of the spring 13 which was compressed at the beginning of the dummy bar insertion, the link locking protrusion 7 provided on one of the links 1 and 5 and the opposing surface a of the link locking recess 8 provided on the other link 1. The link is rotated about the link rotation center (connecting pin 4) in the direction in which the link contacts (direction in which the spring 13 extends), and finally the link rotation stop protrusion 7 is held in contact with the opposing surface a of the link rotation stop recess 8. As a result, the end of the dummy bar assumes a posture along the vertical portion of the slab moving path 10 directly below the mold.

[Effect of idea]

As described above, according to this invention, the spring of the dummy bar straightness holding mechanism is compressed at the position immediately before insertion into the mold, while maintaining the rotatability between the links, so that the end of the dummy bar is aligned along the slab movement path. In the vertical part directly under the mold, the reaction force of the compressed spring of the dummy bar straightness holding mechanism can hold the dummy bar end in a nearly vertical straight position even without a slab support or dummy bar guide. The dummy bar guide can be omitted from directly under the mold, and
The dummy bar head can be reliably inserted into the bottom of the mold even without a dummy bar guide or slab support. Therefore, it is possible to uniformly cool the slab, improve the quality of the slab, prevent accidents such as breakouts, and reduce equipment and maintenance costs.
It is possible to employ a swirl type cooling device that facilitates maintenance of the cooling device and is effective for uniformly cooling the slab.

[Brief explanation of the drawing]

Figures 1 and 2 are a plan view and a side view showing one embodiment of this invention, and Figure 3 is a line taken along the line - - in Figure 1, which shows the situation when the end of the dummy bar is curved along the slab moving path. FIG. 4 is an enlarged sectional view taken along the sectional view, and is a schematic diagram showing how the dummy bar is used. 1, 1A, 1B... link, 2, 3, 3'...
Projection piece, 4... Connection pin, 5... Dummy bar head,
7...Link rotation stop projection, 8...Link rotation stopper recess, 9...Mold, 10...Slab moving path, 1
DESCRIPTION OF SYMBOLS 1... Liner, 12... Pressing metal fitting, 13... Spring, 14... Dummy bar straight holding mechanism.

Claims (1)

[Scope of utility model registration request] Immediately before insertion into the mold, among the adjacent links at the end of the dummy bar, which are located in the vertical part directly below the mold and in the near-vertical arc part of the slab moving path, one link is provided with a link rotation prevention protrusion, and the other link is provided with a locking protrusion. , a link rotation prevention recess with which the link rotation prevention protrusion engages is provided at a position away from the link rotation center, and a pair of opposing surfaces of the link rotation prevention recess that face each other across the link rotation prevention protrusion hold the link rotation prevention protrusion. The dummy bar end is formed to be movable as the dummy bar end is deformed, and one opposing surface is formed to be able to come into contact with a link rotation prevention protrusion when the dummy bar end becomes straight.
The link provided with the link locking recess is provided with a spring that is compressed by the link locking projection when the end of the dummy bar is bent, and the reaction force of the compressed spring causes the link locking projection to be moved to the one side of the link locking recess. A link-type dummy bar for curved continuous casting, characterized in that a dummy bar straightness holding mechanism is provided for pressing the dummy bar on the side that comes into contact with the opposing surface of the dummy bar.