JPS5937322Y2 - Socket structure for gas introduction used in pouring nozzle - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a gas introduction socket for blowing argon gas or the like into the molten metal flowing down inside a molten metal pouring nozzle, such as a pouring nozzle used in continuous casting.

In recent years, technological innovations in steelmaking equipment have been remarkable, and among them, technological advances in high-grade steel manufacturing methods have been active, and continuous casting methods have been adopted and spread with the aim of improving quality and yield.

This involves receiving molten steel refined in a steelmaking furnace into a ladle, storing it in a tundish, and then pouring it into a mold.

It is used to produce steel pieces by cooling and cutting.

The tundish is a container for molten steel lined with a refractory material, and two or more pouring nozzles are usually attached to the bottom of the tundish.

The conditions required for this pouring nozzle include corrosion resistance, spalling resistance, and abrasion resistance, and their quality greatly affects the quality yield of manufactured steel. Continuous efforts are being made.

As a link to this, there is a technology that performs gas bubbling (usually Ar gas) into the molten steel from the steel passing surface of the pouring nozzle to remove non-metallic inclusions and prevent impurities mainly composed of Al from being attached to the nozzle hole surface. Various nozzle structures have been developed to embody the developed technology.

For example, a gas introduction socket is fixed to the outer surface of the tundish nozzle, high-pressure gas is introduced into the pouring nozzle through the socket, and the gas is injected into the molten steel from the molten steel passage surface (discharge port) to stir the molten steel. This effectively prevents hole clogging in heavy-duty nozzles.

Conventionally, most of the sockets are made of steel, and the sockets are attached by being driven directly into a horizontally elongated hole provided in the pouring nozzle, or by gluing them using fireproof cement or resin adhesive.

However, these methods caused damage to the pouring nozzle and also had problems in terms of adhesive strength.

This invention was devised in consideration of the current situation, and its purpose is to be able to quickly and reliably attach it to the spout nozzle, and to prevent damage to the spout nozzle as much as possible during installation. DESCRIPTION OF THE PREFERRED EMBODIMENTS A gas introduction socket structure according to the present invention will be described below with reference to one embodiment.

As shown in FIG. 2, a hole 3 for attaching a gas introduction socket 2 is bored in the side surface of the pouring nozzle 1.

A plastic metal cylindrical body 5 having an outer diameter approximately equal to the diameter of the hole and having a tapered female thread 4 engraved on its inner peripheral surface is fitted into the circumference.

Furthermore, a gas introduction socket 2 having a male thread 6 carved on its outer peripheral surface is screwed into the plastic metal cylinder 5 .

By this insertion, the outer circumferential surface of the plastic cylinder 5 is pressed and held against the inner circumferential surface of the hole 3.

In the above configuration, the material of the plastic metal cylinder 5 may be sufficiently malleable copper, copper alloy, lead, soot alloy, aluminum, etc., while the material of the gas introduction socket 2 may be ordinary steel, stainless steel, etc. Therefore, it is necessary that the hardness is at least higher than that of the plastic metal cylinder 5 described above.

Further, although the cross-sectional shapes of the hole 3 and the plastic metal cylinder 5 are preferably circular, other cross-sectional shapes may be used.

Furthermore, although it is preferable that the male thread 6 of the gas introduction socket 2 be tapered as shown in the figure, it can also be made without a taper.

In addition, in the figure, 7 is an annular gas flow path bored in the peripheral wall around the molten metal flow path 1a of the pouring nozzle 1, and 8 is a tundish.

Next, a method of attaching the gas introduction socket according to the present invention will be described.

First, a hole 3 having the minimum diameter into which the plastic metal cylinder 5 can be smoothly inserted is bored in the side surface of the spouting nozzle 1.

Next, the steel gas introduction socket 2 is inserted into the plastic metal cylinder 5 while the male thread 6 is screwed into the tapered female thread 4.

Since the cylindrical body 5 is made of a plastic material, it expands in the radial direction as the amount of insertion increases, and as a result of this expansion, the outer circumferential surface of the plastic metal cylindrical body 5 is strongly crimped to the inner circumferential surface of the hole 3. , so that the gas introduction socket 2 is securely fixed to the side surface of the spouting nozzle 1.

As shown in FIGS. 5 and 6, the plastic metal cylinder 5 can be expanded more easily if it is cracked in one or more places in the radial direction, or if it is divided into parts.

Moreover, a sealing material can also be interposed in the gap.

As described above, the gas introduction socket structure according to the present invention can achieve the following effects.

(1) By utilizing the plasticity of the plastic metal cylindrical body, the socket can be reliably fixed to the side surface of the pouring pipe by simply screwing and inserting the socket into the metal cylindrical body.

(2) Since gas such as argon constantly flows inside the socket, the plastic metal cylinder can maintain sufficient mechanical and physical strength even under high temperatures.

(3) Since the outer circumferential surface of the plastic metal cylinder is in close contact with the inner circumferential surface of the hole, sufficient airtightness can be obtained.

(4) It can be manufactured and installed at low cost.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a spout nozzle equipped with a gas introduction socket according to the present invention, Fig. 2 is an explanatory diagram of the installation state of the socket, Fig. 3 is a sectional view of the gas introduction socket, and Fig. 4 is a sectional view of the plastic metal cylinder, and FIGS. 5 and 6 are explanatory diagrams showing the transformation of the plastic metal cylinder.

Claims (1)

[Scope of utility model registration request] 1. A socket mounting hole is formed in the circumferential wall of the spouting nozzle, and one end communicates with the annular gas flow path provided in the circumferential wall, and the other end is opened on the outer circumferential surface of the spouting nozzle. A plastic metal cylinder that fits and has an outer diameter equal to that of the mounting hole, and a tapered gas introduction socket that is screwed into the plastic metal cylinder and is made of a harder metal than the metal cylinder. Socket structure for gas introduction used in the exit nozzle. 2. The gas introduction socket structure for use in a pouring nozzle according to claim 1, wherein the plastic metal cylinder is a circular cylinder. 3. The note set forth in claim 1 of the utility model registration claim, wherein the plastic metal cylinder is a circular cylinder, and the cylinder has a slit in its peripheral wall that is open at one end and extends parallel to the axis. Socket structure for gas introduction used in the exit nozzle. 4. The note set forth in claim 1 of the utility model registration claim, wherein the plastic metal cylinder is a circular cylinder, and the cylinder has slits in its peripheral wall that are open at both ends and extend parallel to the axis. Socket structure for gas introduction used in the exit nozzle.