JPH0422967B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method and apparatus for repairing a tap hole in a converter.

BACKGROUND ART During tapping in a converter, the inner wall of the tapping hole is eroded and worn by molten steel, and the diameter of the tapping hole gradually increases. Such an enlargement of the hole diameter of the tapping hole is undesirable because it causes molten steel scattering during tapping, shortens the time required for tapping, and leads to non-uniform steel quality due to contamination of slag and the like.

Conventionally, in order to deal with this kind of problem, if the degree of wear of the hole diameter of the tapping hole exceeds a certain standard based on the time required for tapping, repair material is placed on a scoop after tapping into the tapping hole. Repairs include inserting and crimping with a stamp, or drilling the worn tapping hole to a certain diameter, inserting a sleeve brick, and pouring joint filler between the inner wall of the tapping hole and the sleeve brick. measures were adopted.

Problems to be Solved by the Invention However, the conventional repair methods described above require 60 to 200 minutes of repair time, and the repair time has come to be only about 5 to 20 minutes at most depending on the timing of tapping the converter. Nowadays, it has become difficult to apply such repair methods. Moreover, such repairs involve harsh and extremely dangerous work near the hot converter, and there is a desire to improve the working environment.

The present invention has been made with the aim of eliminating such conventional problems.

Means for Solving the Problems The present invention provides a lining material consisting of a steel tubular core material whose diameter can be freely expanded and a layer of refractory repair material formed in advance to a predetermined thickness on the outer peripheral surface of the tubular core material. A converter characterized by inserting the core material into the tap hole and then expanding the diameter of the tubular core material of the lining material to apply a layer of fireproof repair material on the outer periphery of the core material to the melted portion of the tap hole in the converter. A method for repairing an exposed steel hole, a tubular core material whose diameter can be freely expanded, a lining material comprising a layer of fireproof repair material formed in advance to a predetermined thickness on the outer circumferential surface of the tubular core material, and a method for supporting the lining and providing support for the lining. The present invention relates to a converter steel hole repair device characterized in that it is equipped with a supporting diameter expanding device that expands the diameter of the tubular core material of the lining material as appropriate under the conditions.

EXAMPLE The following is a description of the case where the repair method of the present invention is implemented using the illustrated repair device.

The repair device used to carry out the repair method of the present invention includes a lining material A and a diameter expanding device B for supporting the lining material A.

The lining material A includes a steel tubular core material 1 whose diameter can be expanded freely,
It is composed of a fireproof repair material layer 2 formed in advance to a predetermined thickness on the outer peripheral surface of the tubular core material 1, and a coating 3 of oil paper or the like is applied to the outer peripheral surface of the repair material layer 2 for the purpose of protection until the time of installation. can be administered.

The tubular core material 1 shown in Fig. 1 has a structure in which a steel plate is wound into a cylindrical shape so that its opposite ends are wrapped. There is no particular limitation as long as the diameter can be expanded appropriately, such as a shape. The thickness of the steel plate is not particularly limited, but considering the strength as a core material and expandability, a thickness of about 0.2 to 3.2 m/m is appropriate.

The fireproof repair material layer 2 formed on the outer peripheral surface of the tubular core material 1 is required to have plastic deformation that expands as the diameter of the core material 1 increases. The constituent fireproof repair materials include, for example, fireproof materials such as magnesia and dolomite, and tar,
Examples include those made by kneading binders such as pitch and resin.

The thickness of the fireproof repair material layer 2 is determined appropriately according to the diameter of the tapping hole to be repaired, and when expanded,
It is necessary to have a size such that it can be crimped and lined with the inner wall of the tapping hole. Since it is troublesome to adjust the wall thickness of layer 2 each time during construction, prepare in advance about 5 types in increments of 5 to 10 mm based on the standard hole diameter, and select and use them as appropriate according to the hole diameter. It is convenient to be able to do so.

The structure of the supporting diameter expanding device B is not particularly limited as long as it can support the lining material A and expand the diameter of the tubular core material 1 of the lining material A in this supported state.

An example of a support expansion device B is shown in FIG. 3, which device B comprises a spindle 4;
is rotated by a drive device 6 while being fitted and supported by a fixed cylindrical body 5, and is tilted up and down using a pivot 8 as a fulcrum by operating a power cylinder 7. The fixed cylindrical body 5 is attached to a pedestal 10 via a support member 9.
The pedestal 10 is supported by a lifter 1 for height adjustment.
1 and installed on a trolley 12.

At the tip of the spindle 4, there is a support part 13 that is freely fitted over the entire length into the tubular core material 1 of the lining material A.
is formed, and a diameter expanding roller 14 is formed at the tip, for example, as shown in detail in FIGS.
They are installed in three locations at 120° intervals. As shown in the upper half of FIG. 4, this diameter expanding roller 14 fits within the outer diameter contour of the support portion 13 of the spindle 4 when the diameter is not expanded, but as shown in the lower half of FIG. When expanding the diameter, the push rod 15, which is freely inserted through the center axis of the spindle 4, is moved forward a predetermined distance by operating the cylinder 16, and the tail portion 17 of each roller 14 is pushed up at the same time with its tip. , roller 14
are each rotated by a predetermined angle about the pin 18 as a fulcrum, and are projected outward by the expanded diameter width.

When carrying out the repair method of the present invention, in the process diagram of FIG.
The lining material A is supported by the support portion 13 at the tip of the
Next, the cart 12 and the spindle 4 (see Fig. 3) are moved forward, and the lining material A is placed in the tapping hole a of the converter.
Insert inside. In this case, the lining material A used has an outer diameter such that the repair material layer 2 on the outer circumferential surface of the inner lining material A is pressed against the inner wall of the tapping hole a when the inner lining material A is expanded. During the insertion operation into the tapping hole a, the diameter expanding roller 14 is in the non-diameter expanding position (see the upper half of FIG. 4), and the inner wall of the tapped hole a of the inserted lining material A and A gap corresponding to the diameter expansion is created between them.

Next, when the cylinder 16 is operated to advance the push rod 15 and cause the roller 14 to take the diameter expanding position (see the lower half of FIG. Since the diameter of the repair material layer 2 is expanded and the layer 2 is pressed against the inner surface of the tapping hole a, the diameter of the repair material layer 2 is expanded and the diameter is gradually increased while rotating the spindle 4 while maintaining the diameter expansion state of the roller 14. By pulling out the lining material A, the lining material A can be crimped and lined on the inner wall of the tapping hole a. In this case, lining material A
The tubular member 1 remains in the tapping hole a as it is, but it is made of steel and is melted by the heat during tapping and is discharged together with the molten steel. In the present invention, if the tapping hole is extremely rough, the lining material may be inserted and crimped after drilling the hole so that the hole diameter is constant over the entire length.

The tap hole repaired in this way uses an inner cylindrical lining material, so the tap hole becomes a perfect circle, and the plastic fireproof repair layer is crimped to expand the diameter, so it is resistant to wear. It becomes a strong structure.

Effects According to the present invention, the tapping hole can be repaired by extremely simple operations such as inserting a cylindrical lining material and crimping to expand the diameter, and the time required for repair is, for example, 10 to 15 minutes. A short time of about a minute is sufficient, and it can be carried out by checking the timing of tapping.

Furthermore, since the work is simple and takes only a short time, the risk of the work is reduced and the work environment can be improved.

Furthermore, it becomes possible to perform high-quality repairs, improving durability, and making it easier to manage tapping time.
By shortening work time and improving durability, converter operating efficiency can be improved.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway slope view of the lining material used in the repair method of the present invention, Fig. 2 is a sectional view of the lining material, and Fig. 3 is a schematic diagram of the equipment used to carry out the repair method of the present invention. FIG. 4 is an enlarged sectional view showing the operation status of the diameter expanding roller, FIG. 5 is a front view of FIG. 4, and FIG. 6 is a process diagram showing one implementation status of the repair method of the present invention. . In the figure, A is the lining material, 1 is the tubular core material, 2 is the fireproof repair material layer, 3 is the coating, B is the support diameter expansion device, 4
is a cylinder, 5 is a fixed cylindrical body, 6 is a drive device,
7 is a power cylinder cylinder, 8 is a pivot, 9 is a support member, 10 is a pedestal, 11 is a lifter, 12 is a trolley,
13 is a support part, 14 is a diameter expanding roll, 15 is a push rod,
16 is a cylinder, 17 is a tail, and 18 is a pin.

Claims (1)

[Scope of Claims] 1. A lining material consisting of a steel tubular core material whose diameter can be freely expanded and a layer of fireproof repair material formed in advance to a predetermined thickness on the outer peripheral surface of the tubular core material is placed in a converter tapping hole. A converter tap hole characterized by inserting the core material into the converter tap hole, and then expanding the diameter of the tubular core material of the lining material, thereby crimping and lining the fireproof repair material layer on the outer periphery of the melted portion of the converter tap hole. Repair method. 2. A lining material consisting of a tubular core material whose diameter can be freely expanded, a layer of fireproof repair material formed in advance to a predetermined thickness on the outer peripheral surface of the tubular core material, and a lining material that supports the lining material and, under this supported state, 1. A converter tapping hole repair device comprising a supporting diameter expanding device for suitably expanding the diameter of a tubular core material.