JPS6335360Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a patching repair member for repairing the outer peripheral surface of a refractory cylinder such as a lance pipe.

As is well known, in the steel industry, various processing agents such as nitrogen, argon, It is common practice to blow a lance pipe into the molten metal together with an inert gas such as.

The lance pipe used at this time is a round steel core tube (hereinafter abbreviated as core tube) for introducing gas for molten metal processing, with a blowout nozzle installed at the tip, and a large number of studs welded to the outer periphery of the core tube. It has an elongated cylindrical shape and is formed by attaching it and covering and fixing the periphery with an unshaped refractory such as castable refractory.

When a gas blowing lance pipe constructed in this manner is immersed in molten metal and used for gas blowing, it may be exposed to the high temperature of the molten metal, the impactful flow of the molten metal, or the sudden heat caused by repeated use.
Due to rapid cooling, etc., cracks and abnormal erosion occur in the coated refractories, rendering them unusable, so recoating and repair must be carried out in a short period of time.

Conventionally, methods for repairing this damaged lance pipe have mainly been spraying repair and patching repair, but these repair methods have the following problems.

(1) Spraying repairs use a wet spraying method in which refractory aggregate, binder, and water are mixed in advance and made into a slurry using a spraying machine, but there is a high rebound loss of the refractory material. The work environment is deteriorated due to the generation of dust, and the adhesive strength between the repaired surface and the refractory material is weak, making it impossible to obtain a strong recoating layer.

(2) Patching repair is a method of repairing by manually pressing plastic refractories onto the damaged area, and there is no rebound loss and there is no concern about dust generation. cannot be performed sufficiently and the effect is small. In addition, there are problems in terms of the working environment as the work is carried out at high temperatures (temperature of the surface to be repaired is approximately 500 to 700°C).

To this end, various attempts have been made to improve the work environment and take advantage of the advantages of patching repair, which does not generate dust due to rebound loss, and to replace manual work with automation. I have nothing.

The present invention solves these problems by using a two-layer slice-like repair member with both ends formed into strips, which increases the efficiency of hot repair work and increases the repair effect. The purpose of this invention is to provide a patching repair member for.

The present invention will be explained below with reference to an embodiment shown in FIGS. 1 and 5.

As shown in FIG. 1, the patching repair member for the outer peripheral surface of a refractory cylinder according to the present invention includes a heat-resistant felt 1 having both ends formed into a strip shape so that a concave portion 3 at one end and a convex portion 4 at the other end can fit together; The heat-resistant felt 1 has a two-layer sliced structure with the monolithic refractory 2 coated on the central part 5 of one side of the plane.

Heat-resistant felt 1 is applied with both sides coated with monolithic refractory 2, which will be described later, to the damaged part of lance pipe 6 and wrapped around the outer circumferential surface, and when repairing by patching, grasp both ends of heat-resistant felt 1 and tighten, and then tighten the center part of the plane. In order to ensure that the monolithic refractory 2 coated on the surface of the refractory 5 can be reliably attached, a recess 3 is provided at one end in the longitudinal direction and a projection 4 is provided at the other end, as shown in FIG. Both ends are formed into a rectangular shape so that the convex portion 3 and the convex portion 4 can be fitted together.

Concave and convex portions 3 and 4 provided by forming both ends into a rectangular shape
The patching repair material is attached to the lance pipe 6 (third
After wrapping it around the damaged part of the heat-resistant felt 1 (shown in the figure), it is sufficient to grasp the convex parts 4, 4' on the opposite side of the heat-resistant felt 1 and tighten it. In order to mechanize the process using a device that has the function of gripping and tightening the heat-resistant felt 1 by changing the grip, the width direction of the heat-resistant felt 1 is divided into equal parts (5 equal parts in the example), and the recesses 3 on the same end side are divided into equal intervals.
Alternatively, it is necessary to provide the convex portions 4 or 4 alternately with the concave portions 3 or 3' at one end and the convex portions 4 or 4' at the other end so that they fit together. Therefore, in order to facilitate fitting, it is desirable to provide the convex portion 4 with a width dimension slightly smaller than that of the concave portion 3.

The longitudinal dimension l of the central portion 5 where the monolithic refractory 2 is applied to one side of the heat-resistant felt 1 is as follows:
The patching is formed to have approximately the same outer circumferential dimension as the lance pipe 6 to be repaired, and at least
It is important that the length is not longer than the outer circumference of the lance pipe 6, and the width direction dimension should be set arbitrarily according to the size of the damaged part of the lance pipe 6 to be repaired (the longitudinal damage dimension of the lance pipe 6). Bye.

There are no particular restrictions on the material of the heat-resistant felt, but lance pipe 6 that has been repaired by patching
When immersed in molten metal and reused for gas blowing, it is possible to use ceramic fiber blankets, which are highly effective against erosion from the molten metal and slag by vitrifying in the molten metal. desirable.

Monolithic refractory material 2 applied to the heat-resistant felt 1
An unshaped refractory 2 such as a plastic refractory or a castable refractory is used to form an unshaped refractory 2 into a central part 5 of one side of the plane excluding the uneven parts 3 and 4 provided by forming both ends of the heat-resistant felt 1 into strips. In order to ensure that the refractory 2 adheres sufficiently to the damaged part of the lance pipe 6 and can be repaired by patching, it is applied somewhat thickly to a thickness of about 5 to 30 m/m, and the surface is made smooth and then heat-resistant felt is applied. 1 and the monolithic refractory 2 are formed into a two-layer slice shape.

There are various methods for applying the monolithic refractory 2, such as troweling or pouring using a frame, and any conventionally known method may be used.

Then, if the surface of the monolithic refractory 2 is covered with vinyl or the like to prevent moisture from evaporating from the monolithic refractory 2 during storage and repair, the monolithic refractory 2 can be applied unless it is immediately before patching repair. This eliminates the inconvenience of not being able to do it.

When repairing a damaged portion of the lance pipe 6 by patching using the patching repair member of the present invention constructed in this way, grasp both ends of the heat-resistant felt 1 and attach the surface side coated with the monolithic refractory 2 to the lance pipe 6. 3, wrap it around the outer peripheral surface of the lance pipe 6 as shown in FIG. By changing the grip and tightening while pulling, the monolithic refractory material 2 coated on the flat surface of the heat-resistant felt 1 is adhered to the lance pipe 6, and even if the surface of the monolithic refractory material 2 is covered with vinyl etc., the lance remains intact. The temperature of the repaired surface of pipe 6 is 500
Since the temperature is about ~700°C, the adhesive strength will not decrease.

Furthermore, the patching repair material is attached to the lance pipe 6.
If the monolithic refractory 2 is automatically applied to the damaged part of the lance pipe 6 and then wrapped, the lance pipe 6 can be made stronger by mechanizing it using a device that can tighten the lance pipe 6 by gripping the convex part 4 on the opposite side of the heat-resistant felt 1.
It can be bonded to other parts of the body, and can be sufficiently filled into cracks, etc., thereby increasing the repair effect.

In the embodiment, both lengthwise ends of the heat-resistant felt 1 are divided into five equal parts in the width direction to provide uneven parts 3 and 4, but the widthwise dimension of the heat-resistant felt 1 is adjusted to the size of the damaged portion of the lance pipe 6 to be repaired by patching. It can be set arbitrarily, and it can be divided into 2, 3, or 7 equal parts depending on the set width direction dimension, and the effect will change even if both end corners of the convex part 4 are cut diagonally or rounded. There are no examples, and the invention is not limited to the examples. Moreover, although the patching repair member of the present invention has been described as an example applied to the lance pipe 6, it is not limited to this, and it goes without saying that it can also be applied to repairing the outer peripheral surface of similar cylindrical refractories.

As explained above, the present invention is a heat-resistant felt with both ends formed into a strip shape so that a concave part at one end can fit into a convex part at the other end. Since it is configured in a slice shape, it has the following effects.

(1) Instead of the conventional repair work in which workers press plastic refractories by hand, the concave and convex portions on both ends of the heat-resistant felt fit together and the convex portions are pulled while tightening, improving work efficiency and reducing repair costs. Shaped refractories can be firmly bonded.

(2) By mechanizing the process using equipment, workers can be freed from hot work, and a stronger adhesive layer of the repair material can be obtained.

(3) Since it is crimped from the outer circumferential surface, it can be expected to be a repair method that can deal with various forms of damage.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
FIG. 1 is a perspective view of a patching repair member, FIG. 2 is a perspective view of a heat-resistant felt, and FIG. 3 is a perspective view for explaining a state in which the patching repair member is wrapped around a lance pipe. The symbols in the figure are as follows. 1... Heat-resistant felt, 2... Monolithic refractory, 3
...Concave portion, 4...Convex portion, 5...Plane center portion, 6...
...Lance pipe.

Claims (1)

[Scope of utility model registration request] The outer circumferential surface of a refractory cylinder is made by applying monolithic refractory material 2 to the central part 5 of one side plane of heat-resistant felt 1, which has both ends formed into strips so that the concave part 3 at one end and the convex part 4 at the other end can fit together. patching repair parts.