JPH10332281A - Device and method for application of lining refractory for molten metal container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the application efficiency and application quality of a lining refractory for a molten metal container by a method wherein a monolithic refractory is fed in forms, moved along the inner surface of the molten metal container and the monolithical refractory is pressurized on the inner surface of the molten/metal container by a pressure roller through a nozzle. SOLUTION: An applying device 1 attached to a manipulator is charged in a molten steel ladle 2. An endless belt 8 is followed along the inner surface of the molten steel ladle 2 as forms 3 is laterally moved along the inner surface of the molten steel ladle 2. A monolithical refractory 4 mixed with a hardening accelerator is fed through a discharge port 10 of a nozzle 5 between the inner surface of the molten steel ladle 2 and the endless belt 8 together with compressed air. The fed monolithical refractory 4 is pressed against the inner surface of the molten steel ladle 2 by a pressure roller 6. The forms 3 and the pressure roller 6 are helically or annularly moved along the inner surface from the bottom part of the molten steel ladle 2 toward an upper part. This constitution continuously applies the monolithical refractories 4 on the inner surface of the molten steel ladle 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for installing a refractory lining a molten metal container.

[0002]

2. Description of the Related Art Conventionally, there have been two construction methods described below for constructing a refractory on the inner surface of a molten metal container.

As a first construction method, as shown in FIG. 8, a mold 50 is provided inside a molten metal container (for example, a molten steel ladle 2), and a space between the mold 50 and the inner surface of the molten metal container is provided. There is a construction method in which the irregular-shaped refractory 4 is poured, and after the irregular-shaped refractory 4 is hardened, the mold 50 is removed. Specifically, for example, as shown in JP-A-54-139807, a mold is provided so as to be movable with respect to the inner surface of a molten metal container on which an amorphous refractory is to be constructed, and the inner surface of the molten metal container is provided. There has been a method in which an irregular refractory is filled between a mold and a mold, and after the irregular refractory is hardened, the irregular refractory is constructed while sequentially moving the mold.

As a second construction method, as shown in FIG. 9, a nozzle 51 for discharging the amorphous refractory 4 together with compressed air is positioned inside a molten metal container (for example, a molten steel ladle 2). There was a construction method in which the irregular-shaped refractory 4 was sprayed toward the inner surface of the metal container. Specifically, for example, as shown in JP-A-54-61005,
Amorphous refractories are pumped together with compressed air using a pump, and a curing accelerator is added.From the tip of the nozzle,
There has been a method of spraying an amorphous refractory on the inner surface of a molten metal container.

[0005]

However, the above-mentioned conventional method for applying the irregular-shaped refractory has the following problems. In the first construction method, the form is made movable so that the form is reduced in size and the construction efficiency is improved. However, in the first construction method, it is necessary to smooth the surface of the mold frame facing the work surface and apply a release material such as oils and fats. Also, the formwork had to be moved for each work unit of the construction. For this reason, the equipment cost is increased, and the intended purpose of shortening the construction time and improving the work efficiency cannot be achieved.

In a second construction method, a work surface is
Irregular refractories are sprayed with compressed air. For this reason, there is a loss due to the rebound of the amorphous refractory and dust is generated. In addition, the irregular-shaped refractory constructed by spraying not only has a reduced accuracy of the construction thickness but also has a high porosity and is inferior in durability because it is formed while involving compressed air. Further, since the thickness of the construction is increased while laminating the construction parallel to the surface to be constructed, it is easy to peel off at the lamination part and the durability is poor.

Accordingly, the present invention has been proposed in view of the above-mentioned problems of the prior art, and is intended to improve the efficiency of construction and improve the quality of construction of a refractory lining of a molten metal container. An object is to provide an apparatus and a construction method.

[0008]

Means for Solving the Problems (Features) The present invention is to achieve the above-mentioned object, and has the following features. Claim 1
The described invention includes a mold movable along the inner surface of the molten metal container, and a nozzle for supplying an amorphous refractory into the mold. Behind the moving direction of the mold, a pressure roller is provided which moves with the mold and presses the irregular refractory supplied into the mold toward the inner surface of the molten metal container.

The invention according to claim 2 is the above-described claim 1.
In addition to the configuration of the invention described above, the mold includes an endless belt that follows the inner surface of the molten metal container as the mold moves.

The third aspect of the present invention is the first aspect of the present invention.
In addition to the configuration of the invention described above, the front side in the moving direction of the mold is inclined from the upper part to the lower part so as to reduce the width of the mold in the moving direction.

The invention according to claim 4 is the above-described claim 1.
In addition to the configuration of the invention described in any one of the above-described embodiments, the mold is provided with a release promoting layer of an amorphous refractory on an inner surface thereof.

The invention according to claim 5 is the above-described claim 1.
In addition to the configuration of the invention described in any one of the above-described embodiments, the form further includes a form vibrating device that vibrates the form toward the inner surface of the molten metal container.

According to a sixth aspect of the present invention, a refractory lining is applied to the inner surface of the molten metal container by the following procedure. First, while moving the mold along the inner surface of the molten metal container, a nozzle for discharging the irregular-shaped refractory is positioned in front of or above the moving direction of the mold. Then, the irregular-shaped refractory is supplied from the nozzle into the mold. Next, the irregular-shaped refractory supplied into the mold is pressed toward the inner surface of the molten metal container by a pressure roller located at the rear in the moving direction of the mold, so that the inner surface of the molten metal container is not pressed. Construct refractories continuously.

[0014] The invention of claim 7 provides the above-mentioned claim 6.
In addition to the configuration of the invention described above, the mold is vibrated toward the inner surface of the molten metal container while the irregular refractory is being supplied into the mold, and the inner surface of the molten metal container is filled with the irregular refractory.

(Operation) Since the present invention has the above-described structure, the following operation is achieved. According to the first and sixth aspects of the present invention, when the irregular-shaped refractory is applied to the inner surface of the molten metal container, the form moves along the inner surface of the molten metal container. An irregular refractory is supplied to the mold from a nozzle located forward or above in the moving direction of the mold. Then, the irregular-shaped refractory supplied into the mold is pressed toward the inner surface of the molten metal container by the pressing roller. In this manner, the amorphous refractory can be continuously applied to the inner surface of the molten metal container. At this time, if the refractory is supplied from the front in the moving direction of the formwork, the difference in the curing speed between the upper and lower portions of the refractory filled in the formwork can be eliminated. The density becomes uniform. Also,
When the irregular-shaped refractory is supplied from above the formwork, the amount of compressed air required for discharging the irregular-shaped refractory can be reduced, so that the amount of air entrained into the construction body can be reduced.

According to the second aspect of the present invention, when the irregular refractory is applied to the inner surface of the molten metal container, the form moves along the inner surface of the molten metal container. At this time, the endless band of the mold follows the inner surface of the molten metal container. An irregular refractory is supplied to the mold from a nozzle located forward or above in the moving direction of the mold. In this manner, the amorphous refractory can be continuously applied to the inner surface of the molten metal container.

According to the third aspect of the present invention, the width of the form in the moving direction decreases from the upper part to the lower part. For this reason, even when the irregular-shaped refractory is supplied from above the formwork, the difference in the curing speed between the upper and lower parts of the irregular-form refractory filled in the formwork can be eliminated, so that the construction can be performed. The body density becomes more uniform.

According to the fourth aspect of the present invention, when the mold moves along the inner surface of the molten metal container, the mold releasing promoting layer
The irregular-shaped refractory can be easily released from the mold inner surface. For this reason, the quality of the construction body is further improved.

According to the fifth and seventh aspects of the present invention, the mold is vibrated toward the inner surface of the molten metal container while supplying the refractory in the mold. For this reason, the entrained air is degassed from the irregular refractory. Therefore, a dense construction body can be obtained.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a construction apparatus and a construction method for a refractory lining of a molten metal container according to the present invention. (First Embodiment) FIGS. 1 to 4 show a first embodiment of a construction apparatus for a refractory lining of a molten metal container according to the present invention.
1 is a perspective view of the construction apparatus, FIG. 2 is a front view of the construction apparatus, FIG. 3 is a plan view of the construction apparatus charged in a molten steel ladle,
FIG. 4 is a side view of the construction device charged in the molten steel ladle.

As shown in FIGS. 1 and 2, a refractory lining construction apparatus 1 for a molten metal container according to a first embodiment can be moved along the inner surface of a molten metal container (eg, a molten steel ladle 2). A mold 3, a nozzle 5 for supplying an irregular refractory 4 in the mold 3, and a pressure roller 6 provided behind the mold 3 in the moving direction of the mold 3 and moving together with the mold 3. ing. 3 and 4, the molten steel ladle 2 is shown as an embodiment of the molten metal container.

(Mold) As shown in FIG. 1, the above-described mold 3 is configured such that an endless belt 8 is rotatably wrapped around a plurality of rotating rollers 7. The endless belt 8 described above is
It rotates following the inner surface of the molten steel ladle 2 with the movement of the mold frame 3.
Can be driven by rotating. The endless belt 8 is preferably formed of a material having a smooth outer surface and excellent releasability from the irregular refractory 4.
A natural rubber sheet or the like is used. Further, from the upper part of the formwork 3 to the upper part of the pressure roller 6, an eave 9 is provided which protrudes toward the inner surface of the molten steel ladle 2, as shown in FIGS. The eaves 9 can prevent the supplied irregular-shaped refractory 4 from scattering. Furthermore, it is preferable that the outer surface of the mold 3 facing the inner surface of the molten steel ladle 2 bend according to the curvature of the inner surface of the molten steel ladle 2, as shown in FIG. Thus, the form 3 facing the inner surface of the molten steel ladle 2
By bending the outer surface of the refractory, the application of the irregular-shaped refractory 4 can be performed more reliably. Although not shown, the mold 3 is attached to a moving device such as a manipulator, and can be moved along the inner surface of the molten steel ladle 2 by driving the moving device. In the above-described embodiment, the endless band 8 is provided on the mold 3, but the inner surface of the mold 3 may be a smooth surface without providing the endless band 8. In this case, it is preferable to provide a release promoting layer on the inner surface of the mold 3. This release promoting layer is formed by, for example, applying a natural rubber sheet, Teflon tape, stainless steel foil, spraying vinyl, or applying wax such as wax.

(Nozzle) The above nozzle 5 is shown in FIGS.
As shown in the figure, the discharge port 10 is positioned in front of the moving direction of the mold 3 and is fixed to the mold 3. In this way, by disposing the discharge port 10 of the nozzle 5 in the front of the moving direction of the mold 3, it is possible to eliminate the difference in the curing speed of the refractory 4 between the upper and lower portions of the mold 3. . Therefore, the density of the construction body can be made uniform. The nozzle may be fixed to the mold 3 such that the discharge port 10 of the nozzle 5 is located above the mold 3.
Although not shown, a pressure pump is connected to the nozzle 5 via a pressure hose. Then, the irregular-shaped refractory 4 is sent out together with the compressed air into the pressure-feeding hose by the pressure-feeding pump, and the curing accelerator is mixed with the irregular-shaped refractory 4 before the nozzle 5, and the work is performed from the discharge port 10 of the nozzle 5 The irregular refractory 4 is discharged onto the surface. Monolithic refractory 4 for use in the present invention include, for example, Al ₂ O ₃ -MgO quality amorphous material or the like is used.

(Pressing Roller) The above pressing roller 6
As shown in FIGS. 1 and 2, the moving device (not shown) is located together with the mold 3 so as to be located behind the moving direction of the mold 3.
It is supported by. The pressure roller 6 has a vertical width substantially equal to the vertical width of the mold frame 3. Although not shown, a driving source such as a motor is connected to the pressing roller 6, and the driving of the driving source causes the pressing roller 6 to rotate. In addition, the rotation direction of the pressure roller 6 is a direction (clockwise in FIG. 1) that follows the irregular refractory 4 constructed on the inner surface of the molten steel ladle 2 with the movement of the mold 3. The pressure roller 6 allows the irregular-shaped refractory 4 supplied into the mold 3 to be supplied.
Is pressed toward the inner surface of the molten steel ladle 2.

(Second Embodiment) FIG. 5 is a front view showing a second embodiment of a mold. In the mold 11 according to the second embodiment, as shown in FIG. 5, the front side 12 of the mold 11 is inclined so as to decrease the width of the mold 11 in the moving direction from the upper part to the lower part. Other configurations are the same as those of the mold 3 according to the above-described first embodiment, and thus the same reference numerals are given and the description is omitted. As shown in FIG. 5, the mold 11 according to the second embodiment has an eave 9 protruding toward the inner surface of the molten steel ladle 2 from the middle of the upper part of the mold 11 to the upper part of the pressure roller 6. It is provided. Further, a receiving piece 13 protruding toward the inner surface of the molten steel ladle 2 is also provided on the inclined front side 12.
The eaves 9 and the receiving piece 13 can prevent the supplied irregular-shaped refractory 4 from scattering.

In the mold 11, although not shown, the discharge port 10 of the nozzle 5 is located at a portion where the eaves 9 are not provided at the upper front of the mold 11. As described above, by positioning the discharge port 10 of the nozzle 5 above the mold 11, the amount of compressed air necessary for discharging the irregular refractory 4 can be reduced. Therefore, the amount of air entrained in the irregular-shaped refractory 4 is reduced, and the quality of the construction body is improved. As described above, in the mold 11 according to the second embodiment, the front side 12 is inclined so that the width of the mold 11 in the moving direction decreases from the upper part to the lower part. Therefore, even if the irregular-shaped refractory 4 is supplied from above the form 11, the form 11
It is possible to eliminate the difference in the curing speed of the irregular-shaped refractory 4 between the upper part and the lower part. Therefore, the density of the construction body can be made uniform.

The mold 11 according to the second embodiment is preferably provided with a mold release accelerating layer on the inner surface thereof in order to accelerate the mold release of the amorphous refractory 4. This release promoting layer is formed by, for example, applying a natural rubber sheet, Teflon tape, stainless steel foil, spraying vinyl, or applying wax such as wax.

(Third Embodiment) FIG. 6 is a plan view showing a third embodiment of the mold. As shown in FIG. 6, the formwork 52 according to the third embodiment is provided with a formwork vibrating device 53 for vibrating the formwork 52 toward the work surface on the formwork support portion 54. Other configurations are the same as those of the mold 3 according to the first embodiment and the mold 11 according to the second embodiment. (Form Vibration Apparatus) The above-described form vibration apparatus 53 is provided on a form support section 54 as shown in FIG. The form vibration device 53 is constituted by, for example, a vibration motor or the like.

(Construction Method) Next, a method for constructing the refractory 4 on the inner surface of the molten steel ladle 2 using the construction apparatus 1 will be described with reference to FIGS. The molten steel ladle 2 shown in FIGS. 3 and 4 has a size that can accommodate, for example, about 300 t of molten steel. In this case, the work thickness of the irregular-shaped refractory 4 is about 200 mm. When the refractory is repaired, the work of removing the deteriorated refractory is performed prior to the application of the irregular-shaped refractory 4 by the application device 1. Further, a refractory is separately constructed on the bottom surface of the molten steel ladle 2. Also, the mold to be used will be described taking the mold 3 according to the first embodiment as an example, but the mold 1 according to the second embodiment will be described.
Basic operations are performed in the same manner in the mold 52 according to the first or third embodiment.

In order to apply the irregular-shaped refractory 4 to the inner surface of the molten steel ladle 2 using the application device 1, first, as shown in FIGS. 3 and 4, the application device 1 attached to a manipulator or the like is used.
Is charged into the molten steel ladle 2. Next, the endless belt 8 is made to follow the inner surface of the molten steel ladle 2 while moving the form 3 in the lateral direction along the inner surface of the molten steel ladle 2. At the same time, a non-illustrated pump is driven to send the irregular refractory 4 to the nozzle 5 together with the compressed air, and the curing accelerator is mixed into the irregular refractory 4 before being discharged from the nozzle 5. Then, from the discharge port 10 of the nozzle 5, the irregular-shaped refractory 4 is supplied between the inner surface of the molten steel ladle 2 and the endless zone 8. The irregular-shaped refractory 4 supplied between the molten steel ladle 2 and the endless belt 8 is pressed by the pressure roller 6 toward the inner surface of the molten steel ladle 2. In this way, the irregular-shaped refractory 4 is continuously constructed while moving the formwork 3 and the pressure roller 6 along the inner surface of the molten steel ladle 2.

The moving direction of the mold 3 may be spiral from the bottom of the molten steel ladle 2 to the top, or may be a ring shape from the bottom of the molten steel ladle 2 to the top. You may move it. Although the molten metal ladle 2 has been described as an example of the molten metal container, other molten metal containers such as a molten metal gutter or a mixed iron wheel may be continuously used by using the construction apparatus 1 according to the present invention. Irregular refractories can be constructed.

[0032]

Next, referring to FIG. 7, an irregular-shaped refractory 4 is constructed by using a construction apparatus 1 provided with molds 3, 11, 52 according to the first to third embodiments of the present invention. A concrete effect of the case where the irregular refractory 4 is constructed without using the construction apparatus 1 will be described. Drawing 7 is an explanatory view showing the concrete effect of construction equipment 1 concerning the present invention.

Using the construction apparatus 1 according to the present invention, the irregular-shaped refractory 4 was constructed on the inner side wall of the ladle 2 of 300 tons under the conditions shown in FIG. The conditions of the experiment are as follows. 1) The chemical composition of the refractory is as follows: 89% Al ₂ O ₃ , MgO
Was 9%. 2) The construction thickness was 150 mm. 3) In the construction method, the conventional wet spraying method sprays vertically to the side wall, and in the construction apparatus 1 using the formwork 3 according to the first embodiment, the construction apparatus 1 sprays in a spiral shape in the circumferential direction. In the construction apparatus 1 using the formwork 11 according to the example and the formwork 52 according to the third embodiment, the ring was sprayed in the circumferential direction in a ring shape.

The following results were obtained as a result of the experiment under the above conditions. (Bounce Loss) The bounce loss was 20% in the conventional wet spraying method, compared with 20% in the first embodiment.
In the construction apparatus 1 using the molds 3, 11, and 52 according to the third example, the improvement was seen to 5%, respectively. (Durable number of times) The number of times of durable was 30 times in the conventional wet spraying method, compared to 200 times in the construction apparatus 1 using the formwork 3 according to the first embodiment, and 30 times in the second embodiment. The number of times was 250 in the construction apparatus 1 using the formwork 11 and 280 in the construction apparatus 1 using the formwork 52 according to the third embodiment, and the improvement was observed. (Apparent porosity of construction body) The construction apparatus 1 using the formwork 3 according to the first embodiment has an apparent porosity of the construction body of 20% in the conventional wet spraying method. 1
7%, 16% in the construction apparatus 1 using the formwork 11 according to the second embodiment, and 15% in the construction apparatus 1 using the formwork 52 according to the third embodiment, and improvement was observed, respectively. (Material discharge air amount) The air amount for discharging the amorphous refractory is 8 kgf /
cm2 compared to the mold 3 according to the first embodiment.
Be a construction apparatus 1 and the third embodiment mold 52 construction apparatus 1, 6 kgf / cm ² was used according to the example, construction apparatus 1 in 4 kgf / cm ² using a mold 11 according to the second embodiment using the , The amount of air could be reduced.

[0035]

Since the present invention is configured as described above, it has the following effects. Claim 1
According to the invention described in claim 6, when the irregular-shaped refractory is applied to the inner surface of the molten metal container, the mold can be moved along the inner surface of the molten metal container. Further, the pressing roller can press the amorphous refractory supplied into the mold toward the inner surface of the molten metal container. Therefore, according to the first and sixth aspects of the present invention, the following five effects can be obtained. First, it is possible to prevent loss due to rebound and to prevent generation of dust. Second, by arranging the formwork at an arbitrary position, the accuracy of the construction thickness can be improved. Third
In addition, since the irregular-shaped refractory can be blown perpendicularly to the work surface, there is no lamination parallel to the work surface, and the durability is improved. Fourth, since the entrained air is degassed from the irregular refractory, a dense construction body can be obtained. Fifth, by improving the filling property of the uneven surface of the work surface, the contact area with the irregular shaped refractory increases,
The adhesion is improved.

According to the second aspect of the present invention, when the mold moves along the inner surface of the molten metal container, the endless belt follows the inner surface of the molten metal container. Therefore, the amorphous refractory can be easily released from the inner surface of the mold without using a release accelerator or the like. For this reason, the quality of the construction body is further improved.

According to the third aspect of the present invention, the width of the mold in the moving direction decreases from the upper part to the lower part. Therefore, when the irregular refractory is supplied from above the mold, the difference in the curing speed between the upper and lower portions of the irregular refractory filled in the mold can be eliminated. For this reason, the density of the construction body becomes even more uniform.

According to the fourth aspect of the present invention, when the mold moves along the inner surface of the molten metal container, the mold releasing promoting layer
The irregular-shaped refractory can be easily released from the mold inner surface. Therefore, the quality of the construction body is further improved.

According to the fifth and seventh aspects of the present invention, the form is vibrated toward the work surface. Therefore, the entrained air can be deaerated from the irregular-shaped refractory. For this reason, the density of the construction body is further improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a construction apparatus using a formwork according to a first embodiment.

FIG. 2 is a front view of a construction apparatus using the formwork according to the first embodiment.

FIG. 3 is a plan view of a construction device charged in a molten steel ladle;

FIG. 4 is a side view of a construction device charged in a molten steel ladle.

FIG. 5 is a front view of a construction device using a formwork according to a second embodiment.

FIG. 6 is a plan view of a mold according to a third embodiment.

FIG. 7 is an explanatory diagram showing a specific effect of the construction apparatus according to the present invention.

FIG. 8 is an explanatory diagram showing a first example of a conventional construction method.

FIG. 9 is an explanatory view showing a second example of a conventional construction method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Construction apparatus 2 Ladle 3 Formwork (1st Example) 4 Irregular refractory 5 Nozzle 6 Pressure roller 7 Rotation roller 8 Endless band 9 Eave 10 Discharge port 11 Formwork 12 Front side 13 Receiving piece 50 Formwork ( Conventional example) 51 Nozzle (conventional example) 52 Formwork (third embodiment) 53 Formwork vibrator 54 Formwork support

Claims (7)

[Claims] An apparatus for applying a refractory to an inner surface of a molten metal container, comprising: a mold movable along the inner surface of the molten metal container; and supplying an irregular refractory into the mold. A nozzle, and a pressure roller that is positioned behind the moving direction of the mold, moves with the mold, and presses the refractory supplied in the mold toward the inner surface of the molten metal container. A refractory lining construction device for molten metal containers. 2. The refractory lining of a molten metal container according to claim 1, wherein the mold has an endless band that follows the inner surface of the molten metal container as the mold moves. Construction equipment. 3. The mold according to claim 1, wherein a front side of the mold in a moving direction is inclined from an upper part to a lower part so as to reduce a width of the mold in a moving direction. The apparatus for constructing a refractory lining of a molten metal container according to claim 1. 4. The refractory lining of a molten metal container according to claim 1, wherein said mold is provided with a release promoting layer of an irregular refractory on an inner surface thereof. Construction equipment. 5. The mold according to claim 1, wherein said mold is provided with a mold vibrating device for vibrating said mold toward an inner surface of the molten metal container. Construction equipment for refractory lining of molten metal containers. 6. A method for applying a refractory to an inner surface of a molten metal container, the method comprising: moving a mold along an inner surface of the molten metal container; A nozzle for discharging the irregular-shaped refractory is positioned, and the irregular-shaped refractory is supplied from the nozzle into the mold, and is supplied into the mold by a pressure roller positioned behind the moving direction of the mold. Pressurizing the shaped refractory toward the inner surface of the molten metal container and continuously applying the amorphous refractory to the inner surface of the molten metal container. . 7. The method according to claim 1, wherein the mold is vibrated toward the inner surface of the molten metal container while the amorphous refractory is being supplied into the mold, and the inner surface of the molten metal container is filled with the amorphous refractory. The method for constructing a refractory lining of a molten metal container according to claim 6.