JPH0647006Y2 - Pull-out plug for repair of converter tap hole - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to the cylindrical repair when a cylindrical repair material having a converter tap hole inserted therein is expanded and crimped for repair. The present invention relates to a withdrawal plug for expanding and crimping a material onto the inner wall of a converter tap hole.

[Prior Art] There are some publicly known examples of a method of repairing a cylindrical portion such as a tap hole of a converter in which a refractory material is lined.

For example, "Conversion method and device for tapped steel hole"
No. 61-110711), the repair material is spread and crimped by a roller diameter expanding device.

However, since this method uses a tubular core material, a so-called buckling phenomenon occurs in which the tubular core material returns to the original diameter after the diameter is expanded, and the refractory shape cannot be maintained after pressure bonding. In addition, this phenomenon is more remarkable as the construction thickness becomes thicker, especially in the case of a thermoplastic hardening repair material, it can be carried out with the heat contained on the repair target side, but the inside of the repair material, that is, the roller expansion side is There is no heat reception and the molded product is fragile. Alternatively, the repair material is decomposed into the outside and the inside, and the durability of the refractory repair material is extremely reduced.

Further, a two-layer structure of a thermoplastic curable material and a room temperature curable is conceivable, but it becomes a weak point that the boundary portion of the two-layer structure is separated.

Other conventional techniques include a press-fitting method (Japanese Patent Publication No. 61-8124) and a spraying method (Japanese Patent Publication No. 60-24311).
In both cases, the compactness after repair work is low, the wear resistance and the melt damage resistance are low, and the service life is inferior.

The applicant of the present application has press-fitted such a mud-like refractory material of the prior art and reduced the denseness and wear resistance due to spraying,
It solves drawbacks such as extension of drying time, difficulty of cracking and crack generation, large amount of rebound loss of material, high durability, labor saving and low labor of construction. He invented a method of repairing a refractory material lined with a cylinder and has already filed a patent application. The summary is as follows.

1.When repairing a cylindrical refractory material, insert a pre-designed cylinder of thermoplastic hardening material inside the repairing cylindrical refractory material that has sufficient sensible heat to make the thermosetting material thermoplastic. A cylinder characterized by expanding the diameter of the cylindrical body and repairing the cylindrical refractory material by moving a diameter-expanding jig having an inclined squeeze surface that gives sufficient pressure to cause the plastic cylinder to change its shape. How to repair refractory materials.

2. A method for repairing a cylindrical refractory material, characterized in that, when repairing the cylindrical refractory material of the preceding item 1, the expanding jig having an inclined squeeze surface is pulled out while vibrating.

3. A method of repairing a cylindrical refractory material, characterized in that, when repairing the cylindrical refractory material of the preceding item 1, a diameter-expanding jig having an inclined squeeze surface is pulled out while rotating.

4. A method for repairing a cylindrical refractory material, which comprises pulling out a diameter-expanding jig having an inclined squeeze surface while vibrating and rotating when repairing the cylindrical refractory material of the above item 1.

[Problems to be Solved by the Invention] In the present invention, a drawing plug, which is a diameter-expanding jig used when applying such a method for repairing a cylindrical refractory material to a tap hole of a converter, a forming that is performed during a converter operation, The slag metal adheres to the plug due to splashing and spitting, which causes problems such as making the inside of the tap hole distorted when pulling out the plug, making it difficult to pull out, or making it impossible to pull out. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a withdrawal plug that advantageously solves such a problem. Further, the tip of the cover has a taper to facilitate insertion of the plug when the angle between the tapped hole and the plug does not match or there is a misalignment.

[Means for Solving the Problems] The present invention is to solve the above-mentioned problems, and the gist of the present invention is to expand the diameter of a cylindrical repair material in the steel exit hole of the converter during converter operation. In the extraction plug for expanding the diameter of the repair material used for repairing, the plug has an expandable squeezing part that holds the taper part for expanding the diameter of the plug, and the tip of the squeezing part is exposed when the plug is pulled out. A pull-out plug for repairing a tap hole of a converter, which is characterized in that a hat-shaped cover that abuts on an inner end of the steel hole is fitted.

That is, the present invention is a drawing plug used when the cylindrical refractory material repair is applied to the tapping hole of the converter during the converter operation (during blowing), forming, splash, and spatter occurring during the operation (during blowing). It is characterized in that a hat-shaped cover is provided on the plug to prevent the slag and the metal from being attached to the plug due to the coating. That is, the slag and the metal are attached to the cover, but not the plug. At the same time when the plug is pulled out, this cover is detached from the plug and falls into the converter, so there is no problem in applying the repair material.

Furthermore, by tapering the tip, the plug (cover) can be inserted smoothly even if there is an angle difference or misalignment between the converter tap hole and the plug (cover). To have.

Next, regarding the hat-shaped cover of the present invention, FIG.
(B), (c), (d), Fig. 2 (a), (b),
Explaining with reference to (c) and (d), the hat-shaped cover 1 is provided with a squeezing portion 4 capable of expanding the diameter so as to sandwich the taper portion 3 for expanding the diameter of the extraction plug 2.

To attach such a hat-shaped cover 1 to the pull-out plug 2, the throttle portion 4 of the hat-shaped cover 1 is opened, and after the pull-out plug 2 is set, the throttle portion 4 is closed. That is,
In this way, the hat-shaped cover 1 can be firmly fixed by the squeezing portion 4 so as not to fall off from the pull-out plug 2. Incidentally, 5 is a brim.

Next, an embodiment of the present invention will be described with reference to FIGS. 3, 4 (a),
An explanation will be given using (b).

When repairing the tapped hole 7 of the converter 6, the cylindrical repair material 8 is crimped inside the tapped hole 7, and at that time, a pulling construction device 9 that allows the pulling plug 2 to move back and forth is used.

The plug 2 is previously inserted into the hollow portion of the cylindrical repair material 8 from the other end having a small diameter without the tapered portion 3 of the extraction plug 2, and the repair material 8 is set in the extraction plug 2.

In this state, the drawing plug 2 is advanced by the drawing construction device 9 so as to pass through the tapped hole 7 of the converter 6 and become as shown in FIG. 4 (a). The hat-shaped cover 1 is attached to the extraction plug 2 in advance.

When the pull-out plug 2 is pulled out from the state shown in FIG.
The state shown in FIG.

That is, in the state of FIG. 4 (a), the tip of the pull-out plug 2 is in a state where the neck of the pull-out plug 2 is in the furnace of the converter 6, and the slag and the metal ingot due to the forming, splash, spitting, etc. in the furnace are It adheres to the hat-shaped cover 1 and does not adhere to the extraction plug 2.

The pull-out plug 2 is pulled out while expanding the diameter of the repair material 8 by the diameter-expanding taper portion 3, but at the same time, the hat-shaped cover 1 opens with the throttle portion 4 and finally detaches from the plug 2 and falls into the furnace.

Therefore, the pull-out plug 2 is protected by the hat-shaped cover 1 when it is located in the furnace and is not damaged by slag, metal, or the like.

The material for the hat-shaped cover used in the present invention is preferably SS, SUS or the like, but is not particularly limited.

[Effects of the Invention] When the present invention is used to repair a cylindrical inner line refractory material (cylindrical body) for repair of a steel tap hole (cylindrical refractory material) of a converter, slag due to forming, splash, spitting, etc. on the plug, ground It is possible to prevent the adhesion of gold, and it is possible to obtain an accurate inner surface of the steel tap hole after the plug pulling out and repairing work which is stable and surely smooth.

[Brief description of drawings]

FIG. 1 is a view showing an example of a milk hat-shaped cover of an extraction plug according to an embodiment of the present invention. FIG. 1 (a) is a perspective view of the cover, and FIG. 1 (b) is a front view of the cover. 1 (c) is a rear view of the cover, and FIG. 1 (b) is a side sectional view of the cover. FIG. 2 is a view showing another example of the top hat cover of the pull-out plug of the embodiment of the present invention. FIG. 2 (a) is a perspective view of the cover and FIG. 2 (b) is a front view of the cover. FIG. 2 (c) is a rear view of the cover, and FIG. 2 (b) is a side sectional view of the cover. FIG. 3 (a) is a schematic partial cross-sectional view showing an example of the overall configuration of the converter tap hole repairing device using the drawing plug of the present invention. FIG. 4 is a side sectional view showing a state before and after starting the pulling out of the pulling out plug of the present invention. FIG. 4 (a) shows a state before starting pulling out, and FIG. 4 (b) shows a state immediately after starting pulling out. It is a figure which respectively shows. DESCRIPTION OF SYMBOLS 1 ... Hat-shaped cover, 2 ... Extraction plug 3 ... Diameter expansion taper part, 4 ... Drawing part 5 ... Collar, 6 ... Converter 7 ... Steel tapped hole, 8 ... Repair material 9 ... Construction device

Claims (1)

[Scope of utility model registration request] 1. A pull-out plug for expanding the diameter of a repair material used for expanding the diameter of a steel exit hole of a converter during the operation of a converter, wherein the plug has a taper portion for expanding the diameter of the plug. And a hat-shaped cover that comes into contact with the furnace inner end of the tapped steel hole at the time of pulling out the plug, is fitted to the tip of the narrowed portion for expanding the diameter. Drawing plug for repairing steel holes.