JPS6214119Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a jig for closing a gas injection tuyere for a molten metal container used for injecting gas into molten metal in a converter or the like.

For the purpose of refining treatment by stirring the molten metal in a ladle etc., homogenizing the temperature and components, flotation separation of non-metallic inclusions, etc., the molten metal is heated by a gas blowing nozzle for the molten metal container, which is installed mainly at the bottom of the molten metal container. It is known to blow inert gas etc. into the inside.
In addition, in recent years, refining furnaces such as top-bottom blowing converters are being used to shorten refining time and improve steel yield.
Inert gas or the like is also blown into the molten metal using a gas blowing nozzle for the molten metal container, which is mainly installed at the bottom.

The life of the above gas injection nozzle for molten metal containers is controlled by the material of the refractory, the degree of cooling by the blown gas, and the degree of repair effect such as spraying of the refractory, but at the current technological level, even this has its limits. There is,
A system is adopted in which spare tuyeres are provided and the tuyere can be replaced and used alternately.

Conventional tuyere closing methods for replacing spare tuyeres are disclosed in, for example, Japanese Patent Application Laid-Open No. 56-123317 or No. 56-1989.
-By the method of filling refractories as shown in Japanese Utility Model Publication No. 77310, and for opening the holes, a cutter for brick demolition was used as shown in Japanese Utility Model Application Publication No. 57-74964. The hole was opened by
However, this method has the problem that it takes time to drill the hole, and the cutter may damage the surrounding refractories (tuyere bricks), reducing the life of the hearth bottom.

The present invention was made to solve the above problems, and a metal bottom plate to which the metal rods are fixed is installed at the bottom of the tuyere refractory, in which multiple metal rods are firmly fixed in the refractory. The present invention provides a tuyere closing jig in which a metal rod for extraction is connected to the metal bottom plate, and by pulling out the metal rod for extraction, the refractory for tuyere closure and the base brick are removed. The molten metal can be reliably and easily removed from the molten metal container.

Embodiments of the present invention will be described below with reference to FIGS. 1 to 4.

In FIG. 1, 1 is a converter bottom, 2 is an iron shell, 3 is a bottom wear refractory, and 4 is a bottom permanent refractory. 5 is a tuyere brick, 6 is a holding brick, 7 is a bottom blowing tuyere inserted into the hole of the tuyere brick 5,
This example has a plurality of thin tubes 7a, a wind box 7b, and a gas supply pipe 7c. 8 shows the bottom blowing tuyere closing device of this invention inserted into the hole of the preliminary tuyere brick 5'.

In addition, 9 and 10 in the figure are upper and lower base bricks, and these may be one piece. Reference numeral 11 is a flange which is fixed to the iron skin 2 by a bolter 12. A first example of the closure device 8 of this invention, as shown in FIGS. 1 and 2, has a plurality of metal rods 14 embedded firmly in the refractory 13 and integrally with the refractory 13.
One end of the metal rod 14 is welded and fixed to a bottom plate 15, and a metal rod 16 for extraction is further welded and fixed to this bottom plate 15. When the preliminary tuyere 5' is closed using the device 8 of this invention, mortar or the like is applied to the surface of the refractory 13, and the metal rod 16 for extraction is inserted using a extraction device (not shown). It is grasped and inserted into the state shown in FIG. 1 to close the preliminary tuyere 5'. On the other hand, when opening the preliminary tuyere 5', the reverse operation may be performed. In this case, the reason why the refractory 13 is also pulled out when the metal rod 16 for extraction is pulled out is because the plurality of metal rods 14 are solidly integrated with the refractory 13, and the contact force between them is large. This is because there is. In preparation for pulling out, by removing the flange 11, the base bricks 9 and 10 can be pulled out together with the pulling operation.

FIG. 3 shows another example in which a nut-shaped large-diameter head 14a is provided at the tip of a plurality of metal rods 14, so that the metal rods 14 (and 14a)
The engagement force between the refractory and the refractory 13 increases. Another example of this increase in engagement force is, for example, as shown in FIG. 4, as shown in FIG.
It is also possible to use one having the following.

As described above, according to this invention, especially when opening the preliminary tuyere, it can be opened simply by pulling out the metal rod for extraction without using a cutter as in the conventional case. It caused no damage to the bricks, had great effects on workability, safety, and lifespan, and greatly contributed to operations using molten metal containers.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a cross-sectional explanatory view of a hearth bottom equipped with a closing jig of the present invention, and FIGS. 2 to 4 are explanatory views of three embodiments of the present invention. 8...Closing device, 13...Refractory, 14...Multiple metal rods, 15...Bottom plate, 16...Metal rod for extraction, 14a...Head, 14b...Irregularities.

Claims (1)

[Claims for Utility Model Registration] (1) A plurality of metal rods are integrally and firmly embedded in a refractory, a metal bottom plate is connected to one end of the metal rod, and a metal rod for extraction is further provided on the bottom plate. A jig for closing the tuyere of a molten metal container. (2) A closing jig for a tuyere of a molten metal container as set forth in claim 1 of the utility model registration claim, in which a plurality of metal rods have heads at their tops. (3) A closing jig for a tuyere of a molten metal container according to claim 1, in which a plurality of metal rods have a plurality of irregularities around the circumference.