JP6984622B2 - How to repair a torpedo car - Google Patents

Description

The present invention relates to a method for repairing a torpedo wagon.

The torpedo wagon used to transport the hot metal has a unique rugby ball type structure, and a refractory lining is provided on the inner surface. When constructing this lining brick, it takes time to construct it because it is necessary to follow the procedure of stacking bricks in the longitudinal direction while rotating the torpedo wagon little by little. In particular, in the intermediate repair that partially repairs the refractory lining, it is necessary to repeat the construction process such as dismantling the bricks at the repaired part, inserting and removing, and carrying out the dismantled scraps while rotating the furnace body of the torpedo wagon. It becomes inefficient. For this reason, indeterminate form of repair refractory has been considered in intermediate repairs.

Amorphous refractories are roughly classified into pouring materials and spraying materials. Of these, when constructing the pouring material, it is necessary to install a formwork inside the torpedo wagon and pour the refractory material into the gap between the remaining lining refractory material and the formwork. However, since the torpedo wagon has a unique shape as described above, it is difficult to obtain a large effect in terms of improving the efficiency of repair. For this reason, repairs by constructing spraying materials using a spraying machine are aimed at.

The following techniques are disclosed for repairing torpedo wagon refractories with spray materials. Patent Document 1 discloses a technique in which the thickness of wet spraying work per operation is 150 mm or less, and the work range is higher than the hot metal level during operation of a torpedo wagon. Further, in Patent Document 2, the worn bricks in the hot water contact portion are replaced with new bricks, and the worn bricks other than the hot water contact portion are wet-sprayed to a desired thickness, or a torpedo wagon is constructed with an irregular refractory material. In a method for repairing a car lining refractory, a technique is disclosed in which a contact portion between a new brick in a hot water contact portion and an irregularly shaped refractory in the longitudinal direction of a torpedo wagon has a comb-tooth structure.

Japanese Unexamined Patent Publication No. 11-229018 Japanese Unexamined Patent Publication No. 2000-212624

By the way, in the torpedo wagon, the receiving port is an opening, so the irregular refractory constructed around the receiving port does not compete with each other in the circumferential direction, and is restrained in the circumferential direction. The power will be weak. When using a torpedo wagon, the lining refractory expands and contracts each time the iron is received repeatedly, so if the restraining force in the circumferential direction is weak, the amorphous refractory is likely to crack, and the residual thickness is sufficient. Even if you have it, it may fall off. Further, none of the techniques described in Patent Documents 1 and 2 increase the restraining force in the circumferential direction of the refractory around the receiving port. Therefore, as described above, the refractory is lined with refractory by repeated use. Cracks may occur and the refractory lining may fall off.

Therefore, the present invention has been made by paying attention to the above-mentioned problems, and an object of the present invention is to provide a method for repairing a torpedo wagon, which can suppress the generation and dropout of cracks in a refractory lining.

According to one aspect of the present invention, it is a method for repairing a torpedo wagon that repairs the refractory lining of the torpedo wagon that conveys the hot metal, and is a fixed form provided side by side in the circumferential direction of the inner peripheral surface of the torpedo wagon. Of the work bricks that are refractory, the removal step of removing the upper brick, which is the upper work brick on the upper side, which is the central part in the longitudinal direction where the receiving port of the torpedo wagon is provided and is on the receiving port side, and the above. The first lining is provided at the position on the inner peripheral surface of the torpedo wagon where the upper brick is provided, which is a standard refractory whose length in the thickness direction is longer than that of the removed upper brick. Provided is a method for repairing a torpedo wagon, comprising a step and a second lining step of providing an irregular refractory on the inner peripheral surface of the torpedo wagon after the first lining step.

According to one aspect of the present invention, there is provided a method for repairing a torpedo wagon that can suppress the generation and dropout of cracks in the refractory lining.

It is a drawing showing a torpedo wagon, (A) shows a side view, and (B) shows a plan view. It is sectional drawing which shows the torpedo wagon before the operation, and shows the arrow view | view of the line I-I in FIG. It is sectional drawing which shows the torpedo wagon which has consumed the refractory lining after operation. It is explanatory drawing which shows the repair method of the torpedo wagon which concerns on one Embodiment of this invention, (A) is the sectional view which shows the removal process, (B) is the sectional view which shows the 1st lining process, (C) and (D). ) Is a cross-sectional view showing the second lining step. It is sectional drawing which shows the torpedo wagon, and shows the II-II line arrow view in FIG. It is explanatory drawing which shows the repair method of the torpedo wagon in the modification, (A) is the sectional view which shows the removal process, (B) is the sectional view which shows the 1st lining process, (C) is the sectional view which shows the 2nd lining process. It is a figure. It is sectional drawing which shows the torpedo wagon after repair by the conventional repair method.

In the following detailed description, many specific details are described by way of illustration of embodiments of the invention to provide a complete understanding of the invention. However, it is clear that one or more embodiments can be implemented without the description of such particular details. Also, for the sake of brevity, the drawings are schematic representations of well-known structures and devices.

<How to repair a torpedo wagon>
The repair method of the torpedo wagon 1 according to the embodiment of the present invention will be described with reference to the drawings. The torpedo wagon 1 is a transport container for transporting hot metal. As shown in FIG. 1, the torpedo wagon 1 has a cylindrical straight body portion 11 extending in the longitudinal direction (left-right direction in FIG. 1) and a small outer shape on the tip side on both ends of the straight body portion 11 in the longitudinal direction. It has a pair of conical portions 12 having a truncated cone shape. In the conical portion 12, the wall portion at the end opposite to the straight body portion 11 is also referred to as a mirror. Further, the torpedo wagon 1 has a receiving port 13 having a part of the side surface opened in the central portion which is the center in the longitudinal direction of the straight body portion 11. Further, as shown in FIG. 2, the torpedo wagon 1 has an iron skin 2 provided on the outside, a permanent brick 3, a work brick 4, and a receiving port refractory material 5. The state shown in FIG. 2 shows the state of the torpedo wagon 1 when it is not in use (before operation) in which a new refractory material is installed.

The permanent brick 3 is a standard refractory material lined on the inner surface of the iron skin 2, and is provided on the lower side opposite to the receiving port 13 side with the receiving port 13 side as the upper side when viewed from the longitudinal direction. Be done.
The work brick 4 is a standard refractory material lined on the inner surface of the permanent brick 3 and the inner surface of the iron skin 2 on which the permanent brick 3 is not provided. Further, as shown in FIG. 2, in the central portion of the straight body portion 11 provided with the receiving port 13, the work brick 4 is in the circumferential direction of the inner peripheral surface of the iron skin 2 when viewed from the longitudinal direction. They are provided side by side and are stacked up to a predetermined height on the upper side of the iron skin 2. That is, in the central portion, the work brick 4 is not provided on the upper inner surface around the receiving port 13 of the iron skin 2, and the receiving port refractory material 5 described later is provided. Of the work bricks 4, the upper work brick 4 on the central portion where the receiving port 13 is provided and on the receiving port 13 side is referred to as the upper brick 41. The upper brick 41 is a work brick 4 to be removed in a removal step described later, and is the length in the circumferential direction of the torpedo wagon 1, that is, the number of upper steps of the work brick 4 when viewed from the longitudinal direction, depending on the range to be removed. Is decided. In FIG. 2, as an example, the upper brick 41 is the upper two-tier work brick 4.

The receiving port refractory material 5 is a refractory material lined around the receiving port 13 inside the iron skin 2. The receiving port refractory 5 is a pouring amorphous refractory which is an amorphous refractory provided by pouring. As shown in FIG. 2, the receiving port refractory 5 is provided on the receiving port 13 side of the permanent brick 3 and the work brick 4 in the central portion of the straight body portion 11 and covers the upper end of the iron skin 2. Is provided.

The materials of the permanent brick 3, the work brick 4, and the hot metal receiving port refractory 5 are not particularly limited as long as they can be used, and are generally used for transporting and holding hot metal such as a torpedo wagon. Any can be used. For example, permanent brick 3, the workpiece bricks 4, the material of受銑port refractories 5 _may be Al ₂ O 3 -SiO ₂ system. The refractory materials provided inside the torpedo wagon 1, such as the permanent brick 3, the work brick 4, and the refractory material at the receiving port 5, are collectively referred to as a lining refractory material. Further, regarding the lining refractory material, the direction from the iron skin 2 to the inside (the direction of the abbreviated line of the iron skin 2) is referred to as the thickness direction, and the length of the lining refractory material in the thickness direction is referred to as the thickness.

Further, the torpedo wagon 1 further has a support device (not shown) that supports both ends in the longitudinal direction, which is the left-right direction in FIG. 1, and a trolley (not shown) on which the support mechanism is mounted, and the trolley carries the trolley. It is configured to be movable by being connected to a self-propelled vehicle for use. The support device is provided with a tilting mechanism for tilting the furnace body (iron skin 2 and lining refractory material) of the torpedo wagon 1 shown in FIG. According to the tilting mechanism, the furnace body of the torpedo wagon 1 is tilted around a central axis extending in the longitudinal direction while both ends in the longitudinal direction are supported.

For example, in a steel mill, the torpedo wagon 1 receives hot metal from a blast furnace through a hot metal receiving port 13 arranged facing upward in the vertical direction and houses the hot metal inside. In the torpedo wagon 1, receiving the hot metal inside is also referred to as a hot metal. Then, the torpedo wagon 1 is transported by a self-propelled vehicle to transport the hot metal to the steelmaking process, which is the next process. In the steelmaking process, the furnace body is tilted by the tilting mechanism of the hot metal wheel 1, and the hot metal is discharged below the hot metal wheel 1 by the receiving port 13 facing downward in the vertical direction.
In such a torpedo wagon 1, the refractory lining is consumed and the thickness is reduced by repeating washing, transporting the hot metal, and discharging the hot metal with the operation, as shown in FIG. In FIG. 3, the dotted line indicates the position of the inner surface of the lining refractory before operation. In the repair of the torpedo wagon 1 according to the present embodiment, the refractory lining of the torpedo wagon 1 is repaired to increase the thickness of the refractory lining to the same extent as the thickness of the dotted line before operation (intermediate repair).

In the repair of the torpedo wagon 1 according to the present embodiment, first, as shown in FIG. 4A, a removal step of disassembling and removing the hot metal receiving port refractory material 5 and the upper brick 41 from the state of FIG. 3 is performed. In the removal step, all the hot metal receiving port refractory 5 in the central portion of the straight body portion 11 is disassembled and removed. Further, in the removal step, the length in the circumferential direction of the upper brick 41 to be dismantled and removed (the width of the upper brick 41), that is, the receiving port 13 side on the outer periphery of the work brick 4 provided in a fan shape when viewed from the longitudinal direction. The distance from the end of the brick to be disassembled and removed is preferably 100 mm or more. By setting the length of the upper brick 41 in the circumferential direction to 100 mm, the holding brick 42 provided in the next step is less likely to be cracked even if it receives pressing pressure from the receiving port refractory material 5. Further, from the viewpoint of the time required for repair and the cost required for the refractory material, the width of the upper brick 41 is preferably 300 mm or less.

After the removal step, as shown in FIG. 4B, the length in the thickness direction is longer than that of the dismantled and removed upper brick 41 at the position where the upper brick 41 is provided, that is, the dismantled and removed upper brick. The first lining step is performed in which the holding brick 42, which is thicker than the thickness at the time of removing the 41, is provided (constructed). The holding brick 42 is the same as the upper brick 41 when not in operation as shown in FIG. That is, in the first lining step, the holding brick 42 is provided on the upper side of the remaining work brick 4 and fixed by the width of the upper brick 41 dismantled and removed in the removing step.

After the first lining step, a second lining step of providing an amorphous refractory material on the inner peripheral surface of the torpedo wagon 1 is performed. In the second lining step, first, as shown in FIG. 4 (C), water is used as a raw material by using a mold (not shown) at a place where the receiving port refractory 5 is provided in an unoperated state. A new receiving port refractory 5 is provided (constructed) by pouring an irregular refractory (casting material) into which the above is added and drying it. Next, in the second lining step, as shown in FIG. 4D, an amorphous refractory material (spraying material) obtained by adding water to the raw material is applied to the inner peripheral surface of the work brick 4 below the upper brick 41. By spraying and drying, the spray repair part 6 is provided (constructed). The spray repair portion 6 is provided with a thickness such that the position of the inner peripheral surface becomes the inner peripheral surface of the work brick 4 in the unoperated state shown in FIG. The amorphous refractory used in the second lining step is not particularly limited as long as it can withstand use, and any material generally used for transporting and holding hot metal such as a torpedo wagon may be used. Often, for example, it may be an Al ₂ O _3- SiO ₂ system.

The removal step, the first lining step, and the second lining step are repairs in the central portion of the straight body portion 11 shown in FIG. The central portion is a range including at least the receiving port 13 in the longitudinal direction, and may be a range in which the receiving port refractory material 5 is provided in the longitudinal direction as shown in FIG. As for the parts other than the central part, the spraying material is sprayed on the inner peripheral surface of the torpedo wagon 1 and dried to repair the entire inner peripheral surface in the same manner as the repair using the spraying material in the second lining process. The unit 6 is provided.

Further, in such repair of the torpedo wagon 1, the furnace body of the torpedo wagon 1 is tilted, the inner peripheral surface is constructed with the receiving port 13 facing in the horizontal direction, and then the furnace body is installed. It may be tilted to the opposite side to construct the inner peripheral surface on the opposite side. Further, the furnace body of the torpedo wagon 1 may be tilted more finely according to the part where the work is to be performed.
By performing such repairs, the thickness of the refractory lining of the torpedo wagon 1 becomes as thick as in the non-operating state.

<Modification example>
Although the present invention has been described above with reference to specific embodiments, it is not intended to limit the invention by these explanations. By reference to the description of the invention, one of ordinary skill in the art will appreciate the disclosed embodiments as well as other embodiments of the invention including various modifications. Therefore, it should be understood that the embodiments of the invention described in the claims also include embodiments including these variations described herein alone or in combination.

For example, in the above embodiment, in the second lining step, the spray repair unit 6 is provided after the new receiving port refractory material 5 is provided, but the present invention is not limited to this example. For example, in the second lining step, a new hot metal receiving port refractory 5 may be provided after the spray repair portion 6 is provided.
Further, in the above embodiment, it is assumed that all the receiving port refractory 5 in the central portion is disassembled and removed in the removing step, but the present invention is not limited to such an example. For example, when the receiving port refractory material 5 is disassembled and removed in the removing step, at least the one above the upper brick 41 may be disassembled and removed from the receiving port refractory material 5 in the central portion. That is, in the removal step, only the receiving port refractory material 5 above the upper brick 41 may be disassembled and removed. In this case, in the second lining step, a new receiving port refractory 5 is provided above the remaining receiving port refractory 5.

Further, as a modification of the repair method, repair may be performed in the process shown in FIG. In the modification shown in FIG. 6, as the removal step, as shown in FIG. 6A, only the upper brick 41 is disassembled and removed. Next, in the first lining step, as shown in FIG. 6B, the holding brick 42 is provided at the position where the upper brick 41 is disassembled and removed. Further, in the second lining step, as shown in FIG. 6C, the inner peripheral surface of the receiving port refractory 5 above the holding brick 42 and the remaining work brick 4 below the upper brick. A spraying material may be sprayed on the inner peripheral surface of the above, and a spraying repair portion 6 which is an amorphous refractory may be provided.

Further, in the above embodiment, the pressing brick 42 is the same as the upper brick 41 before operation, but the present invention is not limited to this example. The pressing brick 42 may have a size different from that of the upper brick 41 as long as it can obtain the effect of pressing restraint by the pressing brick 42 described later. For example, the width per brick may be different between the upper brick 41 and the holding brick 42. Further, the composition, characteristics, and the like of the pressing brick 42 may be different from those of the upper brick 41 as long as it can withstand use. Further, the thickness of the holding brick 42 may be at least thicker than the thickness of the upper brick 41 after dismantling and removal. By making the thickness of the holding brick 42 at least thicker than the thickness of the upper brick 41 after dismantling and removing, the holding brick 42 protrudes inward from the inner surface of the worn work brick 4, so that the spray repair portion 6 provided after that is provided. Can be pressed and restrained. When the thickness of the holding brick 42 is thinner than the thickness of the upper brick 41 before operation, the receiving port refractory material 5 and the spray repair portion 6 are provided on the inner peripheral surface side of the holding brick 42 in the second lining step. As a result, the thickness of the lining refractory can be made the same as in the non-operating state. As for the effect of pressing restraint, it is preferable to make the thickness of the pressing brick 42 the same as that of the upper brick 41 before operation, as in the above embodiment, because the effect is increased.

Further, in the above embodiment, the end face of the holding brick 42 on the iron skin side is arranged on the same outer peripheral surface as the end face of the remaining work brick 4 on the iron skin side, but the present invention is not limited to this example. .. If the effect of pressing and restraining is sufficiently obtained, for example, the end face of the holding brick 42 on the iron skin side may be arranged inside the outer peripheral surface of the remaining end face of the work brick 4 on the iron skin side. As in the above embodiment, by setting the end surface of the holding brick 42 on the iron skin side on the same outer peripheral surface as the end surface of the remaining work brick 4 on the iron skin side, the pressing force by the receiving port refractory material 5 Is increased, and the pressing restraint effect described later is improved.
Further, in the above embodiment, the thickness of the refractory lining after repair is set to be about the same as that in the unoperated state, but the present invention is not limited to such an example. The thickness of the lining refractory after repair may be thicker or thinner than that in the non-operating state, depending on the usage conditions of the torpedo wagon 1 and the conditions such as the material of the spray repair portion 6.

<Effect of embodiment>
(1) The method for repairing the torpedo wagon 1 according to one aspect of the present invention is a method for repairing the lining refractory of the torpedo wagon 1 for transporting hot metal, and is a method for repairing the torpedo wagon 1. Of the work bricks 4 which are standard refractories provided side by side in the circumferential direction of the above, the central portion in the longitudinal direction provided with the receiving port 13 of the torpedo wagon 1 and the upper portion on the receiving port 13 side. In the removal step of dismantling and removing the upper brick 41 which is the work brick 4, and at the position where the upper brick 41 on the inner peripheral surface of the torpedo wagon 1 is provided, in the thickness direction of the lining refractory than the upper brick 41 which was dismantled and removed. It is provided with a first lining step of providing a holding brick 42 which is a fixed-form refractory having a long length, and a second lining step of providing an irregular refractory on the inner peripheral surface of the torpedo wagon 1 after the first lining step. ..

In the case of the repair method using the conventional spraying material, the spraying material is sprayed on the inner surface of the lining refractory from the state where the lining refractory shown in FIG. 3 is exhausted for repair. Therefore, after the repair, as shown in FIG. 7, the inner surface of the torpedo wagon 1 is completely covered with the spray repair portion 6A. If the torpedo wagon 1 is used repeatedly in such a state, the spray repair portion 6A will repeatedly expand and contract. However, as shown in FIG. 7, since the end portion on the receiving port 13 side of the spray repair portion 6A is not restrained, the amount of deformation due to expansion and contraction becomes large, and cracks are likely to occur. If a crack is generated in the spray repair portion 6A, the cracked portion will fall off, and further repair or replacement of the refractory lining will be required.

However, according to the configuration of (1) above, in the central portion, the end portion in the circumferential direction of the spray repair portion 6 is pressed and restrained by the pressing brick 42. Therefore, when the torpedo wagon 1 is repeatedly used after repair, deformation in the circumferential direction due to expansion and contraction of the spray repair portion 6 is suppressed, and cracks are less likely to occur. Further, even when a crack is generated, the spray repair portion 6 is pressed and restrained in the circumferential direction, so that it is difficult to fall off.

(2) In the configuration of (1) above, the length of the portion where the upper brick 41 is disassembled and removed in the removal step and the holding brick 42 is provided in the first lining step is 100 mm or more in the circumferential direction.
According to the configuration of (2) above, even if the pressing force is received from the receiving port refractory material 5, the pressing brick 42 is less likely to break.

(3) In the configuration of (1) or (2) above, in the removal step, the pig iron refractory 5 which is an irregular refractory provided on the pig iron 13 side of the upper brick 41 in the central portion is further dismantled. In the second lining step, an amorphous refractory is provided on the receiving port 13 side of the upper brick 41 by pouring, and an amorphous refractory is provided on the opposite side of the receiving port 13 from the upper brick 41. Provided by spraying.

According to the configuration of (3) above, the refractory lining after repair can be in the state shown in FIG. 4 (D), for example. In such a state, the spray repair portion 6 is pressed and restrained by the holding brick 42 and the receiving port refractory material 5, and the effect of the pressing restraint in the configuration of the above (1) can be enhanced. Further, as compared with the conventional repair method as shown in FIG. 7, since the receiving port refractory 5 is formed as an integral body, it is possible to suppress the occurrence of cracks and falling off in the receiving port refractory 5. ..

Next, the examples carried out by the present inventors will be described. In the embodiment, the torpedo wagon 1 having a capacity of 200 tons is repaired in the same manner as in the above embodiment as an intermediate repair after using 300 charges (times) for the transportation and pretreatment of the hot metal from the state before the operation shown in FIG. gone. The preliminary treatment is a treatment in which the hot metal in the hot metal mill 1 is subjected to an oxidative refining treatment or the like during the transportation of the hot metal.
In the embodiment, first, the pig iron refractory material 5 and the upper brick 41 were disassembled and removed in the removal step. Since the upper brick 41 that was dismantled and removed had two stages and the width per stage was 100 mm, the upper brick 41 was dismantled and removed with a width of 200 mm from the upper end of the work brick 4.

Next, as the first lining step, the holding brick 42 was constructed. In the example, two conditions (Examples 1 and 2) were set in which the number of steps of the pressing brick 42 and the width per step were changed. In the first embodiment, the holding brick 42 was constructed with a width of 210 mm by providing three steps with the width per step of the holding brick 42 being 70 mm. Further, in Example 2, the holding brick 42 was constructed with a width of 200 mm by providing two steps with the width per step of the holding brick 42 being 100 mm. The material of the holding brick 42 was Al ₂ O _3- SiO ₂ system.

Further, as a second lining step, a new hot metal receiving port refractory 5 was constructed by installing a formwork in the hot metal receiving port 13 and pouring the pouring material into it. The material of the pouring material was Al ₂ O _3- SiO ₂ system. After that, a spraying material was sprayed on the entire circumference of the mirror and the conical portion 12 and the lower half of the straight body portion 11, and after confirming the curing, the spraying repair portion 6 was cured using a panel and a tension rod. Then, the torpedo wagon 1 was inverted by tilting it, and the remaining parts were also constructed by spraying a spraying material. After confirming the hardening, the panel and the tension rod were removed and dried. The thickness of the spray repair portion 6 was 100 mm in both Examples 1 and 2. The material of the spray material was Al ₂ O _3- SiO ₂ system.

The torpedo wagon 1 repaired in this way was restarted, and the number of times it was used for transportation and pretreatment before the next intermediate repair was investigated. In addition, when operating, while checking the thickness of the lining refractory, if it fell off or the thickness became thinner than the specified thickness, it was deemed unusable and intermediate repair was performed again.
Further, in the example, as a comparison, the case where the holding brick 42 was not used (Comparative Example 1) and the case where the work brick 4 was replaced to repair (Comparative Example 2) were also verified in the same manner. In Comparative Example 1, the receiving port refractory material 5 was removed, a new receiving port refractory material 5 was provided with a pouring material, and then a spraying material was provided on the work brick 4 for repair. Further, in Comparative Example 2, the receiving port refractory material 5 was repaired by providing a spraying material without dismantling and removing it.

Table 1 shows the conditions and results in Examples and Comparative Examples. The result of Comparative Example 1 was carried out a plurality of times, and the interval until the next intermediate repair is the maximum value. Further, the result of Comparative Example 2 was also carried out a plurality of times, and the interval until the next intermediate repair is an average value. As shown in Table 1, under the conditions of Comparative Example 1, a dropout occurred at a portion of the straight body portion 11 repaired by spraying, and the next intermediate repair was performed within 100 charges. On the other hand, in Examples 1 and 2, it was confirmed that the interval until the next intermediate repair was 150 charges or more, and the life was about the same as that of Comparative Example 2 in which the work brick 4 was replaced. Further, in Examples 1 and 2, it was confirmed that the period required for the intermediate repair was 3 days, which was the same as in Comparative Example 1, which was shorter than that in Comparative Example 2 having a long life.

1 torpedo wagon 11 straight body part 12 conical part 13 receiving port 2 iron skin 3 permanent brick 4 work brick 41 upper brick 42 holding brick 5 receiving port refractory 6 spray repair part

Claims (3)

It has a cylindrical straight body portion extending in the longitudinal direction and a pair of conical portions having a truncated cone shape on both ends in the longitudinal direction of the straight body portion, and a side surface thereof is located at the center of the straight body portion in the longitudinal direction. in torpedo car part having a受銑port which is open, and repairing a refractory lining of the torpedo cars for transporting hot metal, a method of repairing a torpedo car,
Of Work bricks are monolithic refractories which are arranged in the circumferential direction of the inner circumferential surface of the torpedo car, a longitudinal direction of the central portion or One the torpedo cars of the torpedo car in the longitudinal direction of the torpedo car A removal step of dismantling and removing the upper brick, which is a work brick provided in the upper portion , which is the end portion on the receiving port side when viewed from the perspective.
It is a standard refractory whose length in the thickness direction of the lining refractory is longer than the thickness at the time of removal of the dismantled and removed upper brick at the position where the upper brick is provided on the inner peripheral surface of the torpedo wagon. The first lining process to install the holding bricks and
After the first lining step, a second lining step of providing an amorphous refractory on the inner peripheral surface of the torpedo wagon, and
How to repair a torpedo wagon. The receiving port on the outer periphery of the work brick provided in a fan shape when the torpedo wagon is viewed from the longitudinal direction at the place where the upper brick is disassembled and removed in the removing step and the holding brick is provided in the first lining step. The method for repairing a torpedo wagon according to claim 1, wherein the distance to be disassembled and removed from the side end is 100 mm or more in the circumferential length. In the removal step, the pig iron refractory, which is an amorphous refractory provided on the receiving port side of the upper brick in the central portion, is further dismantled and removed.
In the second lining step, the amorphous refractory is provided on the receiving port side of the upper brick by pouring, and the amorphous refractory is provided on the opposite side of the upper brick on the receiving port side. The method for repairing a torpedo car according to claim 1 or 2, which is provided by spraying.

Images