JPS6039145Y2 - Device for applying compressive stress to break rings in horizontal continuous casting equipment - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for applying compressive stress to a break ring in horizontal continuous casting equipment.

In recent years, slabs have been cast by pulling the slab horizontally from the lower part of the side wall of a tandish.

The so-called horizontal continuous casting method is gradually being put into practical use because the equipment cost is lower than that of the vertical continuous casting method.

A break ring is attached to the tundish side end of the mold of the horizontal continuous casting equipment, which acts to promote the formation of a solidified shell of the slab within the mold.

The break ring will be explained with reference to FIG.

In FIG. 1, 1 is a dandy can, 2 is a front nozzle fixed to the lower side wall of the dandy can, 3 is a feed nozzle horizontally fixed to the front nozzle 2, and 4 is a front nozzle fixed to the lower side wall of the dandy can.
is the mold, and 5 is the feed nozzle 3 and mold 4
This is a brake ring installed between the

In the break ring 5, the joint surface side j with the mold 4 is kept at a low temperature by the cooling of the mold 4, while the molten steel inflow side is heated to a temperature close to the melting point of the steel, so that the temperature change inside the break ring 5 becomes very large.

Therefore, tensile stress due to thermal stress concentration acts on the joint surface of the break ring 5 with the mold 4 and its vicinity.

The acting direction of the tensile stress is the circumferential direction of the break ring 5.

An example of the temperature distribution of the break ring 5 is shown in FIG.
FIG. 3 shows the distribution of tensile stress in the temperature distribution.

As is clear from FIGS. 2 and 3, there are three
It can be seen that a tensile stress of 00 ko/ct& or more is acting.

Generally, the refractories used for Break Ring-5 have relatively strong compressive strength but weak tensile strength.

Therefore, if the above-mentioned large tensile stress is applied, the break ring 5 may be destroyed, which may cause defects in the surface of the slab or even lead to interruption of casting.

In order to solve the above problem, it is sufficient to reduce the tensile stress acting on the break ring. As a method for this, there is a method as shown in FIG. 1.

This method involves fitting the feed nozzle 3 into the holding plate 6,
Cylinder 8 with presser plate 6 fixed to mold jacket 7
By pressing it against the mold 4 side, the break ring 5 is pushed into the end of the mold 4, thereby applying compressive stress to the break ring 5 and reducing the above-mentioned tensile stress.

However, the above method has the following problems.

That is, the presser plate 6 is heated to a high temperature by heat transfer from the molten steel flowing in the feed nozzle 3 during casting, and also has a thickness of 20 mm to prevent deformation since it applies compressive stress to the break ring 5. ~30rIrIn and weight 30-50 9 iron plates are used.

For this reason, attaching the presser plate 6 requires many people, while removing the presser plate 6 is dangerous because the presser plate 6 is heated to a high temperature as described above. The problem was that it was not easy to do.

This invention was made in order to solve the above-mentioned problem, and is a device that applies compressive stress through the feed nozzle to the break ring installed between the feed nozzle and the mold of horizontal continuous casting equipment. a holding plate having a hole for fitting the feed nozzle; and a connection for connecting the holding plate and the jacket of the mold so that the holding plate can be moved horizontally while being held vertically. and a cylinder that is attached to the mold jacket and acts to press the presser plate against the mold side, and is characterized in that the presser plate can be easily attached and detached.

This invention will be explained by way of examples with reference to the drawings.

4 and 5 are plan views showing the operating state of the apparatus according to the embodiment of the invention, and FIG. 6 is a front view taken along the line A--A in FIG. 4.

In FIGS. 4 to 6, numbers 1 to 5 are the same as those in FIG. 1.

9 is a hole 1o for fitting the feed nozzle 3 in the center part.
It is a presser plate having a

The hole 10 is formed in a shape that tightly fits into the inclined outer peripheral portion of the feed nozzle 3, similar to the presser plate 6 shown in FIG.

11 is a handle fixed to the upper and lower surfaces of the presser plate 9; 12A;
Reference numeral 12B is a connecting member that connects the side surface of the presser plate 9 and the side surface of the mold jacket 7, and one pair is attached on one side of the presser plate 9, one above the other, and one pair is attached on the other side.

The connecting members 12A and 12B have two arms 15a and 1
5b, one end of the arm 15ai5b is pivotally connected,
The other ends are pivotally connected to a bracket 13 fixed to the side surface of the presser plate 9 and a bracket 14 fixed to the side surface of the mold jacket 7, respectively.

The arm 15a of the connecting member 12B and the bracket 14 are pivotally connected to each other by a drop pin 16 in a detachable manner.

17 is a guide member fixed perpendicularly to the side (surface) of the tundish 1 of the mold jacket 7;
This serves to facilitate positioning when attaching the presser plate 9 to the connecting members 12A, 12B.

18 is a cylinder attached at right angles to the back surface of the mold jacket 7 for pressing the presser plate 9 against the mold side; the cylinder rod 7a passes through the mold jacket 7; However, the tip of the rod 7a is fixed to the presser plate 9 with a bolt 19.

As shown in FIG. 4, when the presser plate 9 is pressing the feed nozzle 3 against the mold 4 side, when replacing the break ring 5, etc., to remove the presser plate 9, first After separating the mesh 1 from the mold 4, the bolts 19 fixing the presser plate 9 and the cylinder rod 18a are removed.

After that, use the handle 11 manually to move the holding plate 9 to the feed nozzle 3.
Pull it out.

This allows the presser plate 9 to be removed from the feed nozzle 3.

When removing the presser plate 9, for example, metal may adhere to the outer surface of the front nozzle 2 side of the feed nozzle 3, and the presser plate 9 may be removed.
If the drop pin 16 cannot be pulled out from the feed nozzle 3, the drop pin 16 is pulled out from the bracket 14, and the presser plate 9 is opened to one side via one of the connecting members 12A.

This allows the presser plate 9 to be removed from the feed nozzle 3.

On the other hand, in order to attach the presser plate 9 to the feed nozzle 3, the feed nozzle 3 is inserted into the hole 10 of the presser plate 9 in advance, and the presser plate is placed on the guide member 17.

Thereafter, the bracket 13 and the connecting members 12A, 12B are pinned together, and the presser plate 9 is held vertically by the connecting members 12, 12B.

Next, the presser plate 9 is moved to the mold 4 side, and the tip of the cylinder rod 18a is fixed to the presser plate 9 with a bolt 19.

Then, the cylinder 18 is operated to press the presser plate 9 against the mold 4 side.

As explained above, this invention brings about extremely useful effects such as the ability to attach and detach the presser plate that applies compressive stress to the break ring safely, reliably, and in a short time.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a conventional method of applying compressive stress to a break ring, Fig. 2 is a diagram showing the temperature distribution of the break ring, Fig. 3 is a diagram showing the tensile stress distribution acting on the break ring, 4 and 5 are plan views showing the operating state of the device according to the embodiment of this invention, and FIG.
It is a front view seen from the A-line direction. In the drawings, 1... Tanditshu, 2...
...Front nozzle, 3...Feed nozzle, 4...Mold, 5...Break ring, 6...Press plate, 7... ...Mold jacket, 8...Cylinder, 9...
・Press plate, 10... Hole, 11... Handle, 12A, 12B... Connection member, 13, 14.
...Bracket, 15At5b...Arm, 16...Drop pin, 17...Guide member, 18...Cylinder, 18a...・
・Cylinder rod, 19... Bolt.

Claims (1)

[Claims for Utility Model Registration] A device for applying compressive stress to a break ring installed between a feed nozzle and a mold of horizontal continuous casting equipment through the feed nozzle, the device comprising: a holding plate having a hole; a connecting member for connecting the holding plate and the jacket of the mold to allow the holding plate to move in the horizontal direction while holding it vertically; 1. A device for applying compressive stress to a break ring of horizontal continuous casting equipment, characterized in that it has a cylinder that acts to press a presser plate against the mold side, and the presser plate can be easily attached and detached.