JPH0243860Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a core frame used when repairing a tap hole provided at the bottom of a blast furnace sump with a monolithic refractory.

[Background of the invention] In a blast furnace, iron ore, limestone, and coke are charged, and preheated air is sent in from around the lower side wall to remove iron oxide from the iron ore using carbon monoxide produced by the reaction between the air and coke. Iron is produced through reduction, and components other than iron contained in iron ore react with limestone to form slag, which floats to the surface and is removed from the slag opening at the top, while the hot metal that has collected at the bottom of the slag is removed. It is taken out from the taphole and transported to the next process by a hot metal transport vehicle. The taphole that communicates with this hot water pool is usually made of six layers of fireproof bricks (the thickness of one layer is approx.
350mm), and when blowing air, it is closed by filling it with refractory matsud material, and when tapping, a hole is made in the matsud material using a taphole opening machine, and this hole is closed. After tapping, the taphole is closed again by a taphole closing machine (matsudogan).

If it becomes necessary to repair the taphole, it is difficult to remove the bricks in that area and relay them with refractory bricks in the same way, and therefore,
This is usually done using a monolithic refractory (eg castable). Traditionally, wooden core frames have been used for repairs using monolithic refractories, but even if these wooden core frames are left in the taphole after the monolithic refractories are installed, the There is no need to remove the frame because it burns out due to the heat of the molten pig iron, and there is no need to remove the frame from this aspect.However, this wooden core frame is made by cutting a wooden board into an arc shape to match the inside diameter of the tap hole. Although they are assembled to form a cylindrical shape and require a lot of effort to manufacture, they are extremely uneconomical as they are discarded after each repair.

[Purpose of invention]

This idea was completed after many years of research in view of the above points, and provides a core frame that can be used repeatedly when repairing the area around the taphole of the outer brick layer with monolithic refractories. It is intended to. Another purpose is to speed up the repair work within a limited time when the temperature is high and the wind is out, and to simplify the work of removing the frame from the tap hole.

[Structure of the idea]

In order to achieve the above object, this invention provides a plurality of individual frames that can be combined into a cylindrical shape by partially overlapping each other, and each frame is assembled into a cylindrical shape by providing a slight gap at the overlapping part. In the assembled state, one end side and the other end side are fixed from the inner peripheral side with a fixing member, and at least one of the fixing members is made expandable and retractable, so that the frame itself can be removed when the frame is removed after repair with monolithic refractories. It is constructed so that it can be compressed in the radial direction and taken out.

〔Example〕

Next, this invention will be explained based on embodiments shown in the accompanying drawings.

In the figure, reference numeral 1 indicates the core frame body of the present application, and the core frame body 1 has an outer diameter that approximately matches the inner diameter of the tap hole 20 of the blast furnace, and has a repair portion A of the tap hole 20 (this The length is the same as or longer than the length from the inner end (outer surface of the matwood material 21) to the outer end of the taphole 20, and the end face is It is obliquely cut to match the slope of the mouth 20.

The core frame body 1 includes a plurality of pieces (four pieces in the figure) that can be partially overlapped and combined into a cylindrical shape.
The single frames 2, 3, 4, and 5 are combined into a cylindrical shape with a slight gap l in the overlapping part, and one end of the frame is fixed with a fixing member 6, and the other end is fixed with an expandable fixing member 7. It will be done.

The frames 2 to 5 each include an arc-shaped main part a made of a steel plate, and an overlapping piece b welded to one edge of the concave curved side of the main part a.
However, the main portion a and the overlapping piece b may be integrally formed using a press molding machine or the like.

The fixing member 6 is made of two metal rod-shaped members, and both ends of each are welded between the opposing frames 2 and 3 and between 4 and 5, and are fixed in a cross shape. Of course, it may be in the shape of a cross from the beginning, or it may be in another shape. For example, if the frame is made up of three pieces, a combination of three bars in a triangular or Y-shape will be used. The reason why a simple bar-shaped material was used as the fixing member 6 is because the back side of the taphole 20 is quite high in temperature even when there is no wind and it is windy, so rather than constructing it with a material that has elasticity, it is better to melt it when removing the frame. This is because there is no failure, and even if it is made of an expandable member, it is difficult to expand or contract it from outside the taphole. Of course, it is not impossible to create a mechanism that can withstand high temperatures and that can be easily expanded and contracted from outside the tap hole, and in this case, an expandable and retractable fixing member can be used instead.

The extensible fixing member 7 is a turnbuckle 8
Use a shaft with As in the case of the fixing member 6, both ends of this shaft are welded in a cross shape between the opposing frames 2 and 3 and between 4 and 5. The normal length of this shaft is kept the same as that of the fixing member 6. In addition, it may be provided with extensible means other than the turnbuckle.

Reference numeral 9 denotes a hook piece provided on the inner surface of the outer end of the core frame body 1 when removing the frame; 10 represents a guide cylinder of the core frame body 1; A presser flange 11 is provided.

The guide tube 10 shown in the above embodiment is set so that its flange portion 11 faces the area A to be repaired by the monolithic refractory (in the case of this figure, the second layer on the outside) as shown in the third diagram, and the guide tube The core frame main body 1 is inserted along the line 10 with one end side fixed by the round bar-shaped fixing member 6 first. Prior to this charging, the following preparations are made.

The gap l between the adjacent parts of the frame bodies 1 appearing on the outer surface of the core frame body 1 constituted by the frame bodies 2 to 5 is, for example, filled with adhesive tape 1 as shown in the first figure.
2 or the like, and apply grease to the outer surface of the core frame body 1.

The purpose of the adhesive tape 12 is to prevent the monolithic refractory material 22 from entering the gap 1 during construction, and the purpose of applying the grease is to facilitate removal of the frame.

A wire mesh 13 is provided in the charging direction of the core frame body 1,
A ceramic fiber 14 is further attached to the outer surface. This ceramic fiber 14 fills the gap created between the core frame body 1 and the outer surface of the mated material 21 because the outer surface of the mated material 21 that closes the tap hole 20 is not necessarily flat, and is used as a monolithic refractory during construction. This is to prevent the liquid from flowing into the frame. As this ceramic fiber 14, one with a certain degree of thickness is used,
It is preferable to adapt it to the irregularities of the outer surface of the wood material 21 by compression.

Once the core frame main body 1 is set in the repair area A as described above, the monolithic refractory 2 is inserted into the outer first layer B through the injection port (not shown) provided in advance as shown in the fourth figure.
Inject 2. After curing for a certain period of time, the frame is removed. First, the fixing member 6 and the wire mesh 13 on the back side are gas-cut, and the ceramic fiber 14 is removed by an appropriate method. After that,
By rotating the front extensible fixing member 7, for example, the turnbuckle 8 in the loosening direction, the outer diameter of the core frame body 1 is reduced within the range of the gap l between adjacent frames 2 to 5. , Figures 5 and 6
As shown in the figure, the outer surface of the core frame body 1 is peeled off from the surface of the monolithic refractory. Thereafter, by hooking a suitable jig onto the hooking piece 9 provided on the outer end side of the core frame body 1 and pulling out the core frame body 1 toward you along the tap hole 20, de-shaping is completed.

In addition, in the above embodiment, the outer second layer was explained as an example of the repair area A, but the present invention can also be applied to the case of repairing other areas.

[Effect of idea]

As mentioned above, this invention provides a plurality of single frames that can be combined into a cylindrical shape by partially overlapping each other,
The individual frames are combined into a cylindrical shape with a slight gap at the overlapped portion, and one end and the other end thereof are fixed from the inner circumferential side with a fixing member, and at least one of the fixing members is extended. The core frame can be used repeatedly when repairing the area around the taphole of the outer brick layer that makes up the taphole of a blast furnace with monolithic refractories. At the same time, the work of installing and removing the core frame inside the taphole can be done in a short time during the limited time when the temperature is high and the wind is out. Therefore, the excellent effect of eliminating the economical waste associated with using a wooden core frame as in the past is achieved.

[Brief explanation of drawings]

The figures show an embodiment of this invention; Fig. 1 is a perspective view of the core frame body, Fig. 2 is an exploded perspective view of the core frame, Fig. 3 is a side sectional view when it is set in the tap hole, and Fig. 4 5 is a side sectional view after pouring the monolithic refractory, FIG. 5 is a side sectional view when the frame is removed, and FIG. 6 is a front sectional view when the frame is removed. 1... Main core frame body, 2 to 5... Frame itself,
6, 7...Fixing member, 20...Tapping port, 21...
Pine wood, 22... Monolithic refractory, a... Main part of a single frame, b... Overlapping piece of a single frame, A... Repair part.

Claims (1)

[Claims for Utility Model Registration] (1) A plurality of individual frames that can be combined into a cylindrical shape by partially overlapping each other are provided, and each of the individual frames is formed into a cylindrical shape by providing a slight gap at the overlapping part. An irregularly shaped repair of a blast furnace taphole, characterized in that one end and the other end of the combined state are fixed by a fixing member from the circumferential side, and at least one of the fixing members is configured to be expandable and retractable. Core frame for use. (2) The irregular shape of the blast furnace taphole according to claim 1, wherein the single frame is obtained by welding a superimposed piece made of a steel plate to the concave curved side of one edge of the main part made of a steel plate. Core frame for repair. (3) The utility model according to claim 1 or 2, wherein the fixing member at one end is made of a rod-shaped member that melts when the frame is removed, and the fixing member at the other end is a shaft equipped with a turnbuckle. Core frame for irregular shaped repair of blast furnace taphole.