JPH11291024A - Method for repairing inner surface of ladle and repairing device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove the fault in the repair only with spraying, to drastically improve the service life of a ladle lining particularly by carefully repairing the surrounding of a porous square brick with castable refractory with human hands and further, to prevent the accident caused by leakage of molten steel from the ladle at the time of repairing the refractory in the ladle, particularly, in the repairing at the surrounding of the square brick and the damage position under severe operational condition in the bottom part of the ladle during hot-state. SOLUTION: A repairing device, in which the spraying repair into the inner surface in the ladle is executed from a capsule front working hatch charged into the high temp. ladle 1 turned over on the side just after removing slag and further, the repairing of the surrounding of the porous brick and SN square brick and the abnormal damage position is executed by using the castable refractory from the working hatch, is provided with the capsule 4, in which the outer wall is shielded to the heat and the working space is arranged in the inner part 6 and the working hatch is provided at the frontmost surface and an repairing worker enters in the ladle 1 tilted and turned over on the side, and a carriage 2, in which the capsule 4 is laid at the front part and a balance weight 5 is provided at the rear part and such structure as to transport on the rails 3 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for repairing a ladle refractory, and more particularly to repairing around a brick or a damaged portion of a ladle bottom under severe operating conditions.

[0002]

2. Description of the Related Art A ladle after completion of pouring is moved to a ladle repair station provided with a vertical wall having a hole for repair after tilting and removing the residual steel from the ladle, and the ladle top is placed on the vertical wall. It is lowered to a predetermined position with its end facing. After observing the state of damage to the brick on the inner wall of the ladle from the repair hole in the vertical wall in a state where the temperature is still high after the discharge (this state is referred to as “hot” in the present specification), the spray nozzle is used for repair. Insert it into the hole and spray repair the inner wall and bottom of the ladle. Also, Japanese Patent Application Laid-Open No.
In 1503, a method is employed in which repair is performed by remote control using a spray nozzle attached to a carriage with a sliding and rotating mechanism on a swing arm. Here, spraying is a hot repair method that was unavoidably devised because the repair material could not be applied directly by hand due to the high temperature in the ladle. It is bonded to the working surface of the brick while adjusting it. I didn't. Conventionally, the ladle is repaired hot as described above in consideration of heat loss and time loss, but since it is not inserted inside the ladle due to high temperature, repair of the ladle bottom area is It was done only by spraying.

[0003]

The problem to be solved by the present invention is to eliminate the above-mentioned drawbacks only in the repair by spraying. Particularly, by carefully repairing the surroundings of the porous mass brick by hand, the service life of the brick is greatly improved, and at the same time, accidents due to steel leakage from the ladle are prevented.

[0004]

Means for solving the above-mentioned problems are achieved by the present invention, in addition to a porous ladle inner surface repair by a front hatch of a capsule inserted into a rolled-up hot ladle immediately after the discharge, and a porous ladle. Repairing around a brick, around an SN mass brick, and an abnormally damaged portion from a work hatch using a castable. In order to carry out this method, the outer wall is heat shielded, has a working space inside, has a working hatch on the forefront, and provides a capsule into which a repair worker who can be charged in a tilted ladle can enter. A hot ladle inner surface repairing apparatus comprising a capsule mounted on a front portion, a balance weight on a rear portion, and a carriage moving on a rail.

The operation of the present invention is described below. In the hot repair of a ladle, a hot ladle repair device having a capsule into which a repair worker having a work hatch can enter can be used. Since the outer wall of the capsule is heat-shielded by a water-cooled jacket, the work inside the ladle is possible even immediately after the waste is discharged. Since the bubbling gas is blown from the porous plug during the refining in the ladle refining, the surroundings of the porous plug are particularly severely damaged. By the way, by using the apparatus of the present invention, it is possible to perform castable repair, which is extremely superior to corrosion resistance requiring manual labor, by using heat, thereby extending the life of the porous mass brick and the porous plug. Here, the function of castables is described. Castables have a more dense structure by adding water, kneading and vibrating, so that unlike cast spraying, castables can be used as an effective repair material. It is. Conventionally, since the ladle is not put into the ladle at a high temperature, the entire area of the ladle bottom is repaired only by spraying.

[0006]

Embodiments of the present invention will be described below. After the casting is completed, the ladle is tilted and drained of the remaining ladle, moved to a ladle repair station, and lowered to a predetermined position. Next, as shown in FIG. 1, after the capsule 4 into which the repair worker can enter is advanced on the rail 3 by the carriage 2, the capsule 4 is loaded into the ladle 1. The capsule 4 is placed in front of the carriage 2 traveling on the rail 3, and the capsule peripheral wall is shielded from heat. 700mm on capsule 4 and inside ladle brick
The balance of the entire repair vehicle is maintained by the balance weight 5 so that a certain degree of clearance is obtained. The inside 6 of the capsule 4 has a sufficient working space with a diameter of about 2.5 m, and the peripheral wall of the capsule 4 is thermally shielded by a water cooling jacket 7.

FIG. 2 shows the forefront in the capsule and the ladle bottom 8 as viewed from the work hatch 9 on the forefront in the capsule. The top surface of the capsule 4 has four working hatches 9,
A nozzle is inserted from the central work hatch 9 and sprayed on the ladle bottom 8. The work hatches 10 and 11 mainly perform castable repair of the porous mass bricks 13 and 14, respectively, and the work hatch 12 mainly performs castable repair of the SN mass bricks 15 respectively.

FIG. 3 shows an example of wear of the porous plug 16 and the porous mass brick 17 after casting. Dotted line part 18
Is the portion of the porous mass brick that has been worn out. FIG. 4 shows an example of repairing a porous mass brick after replacing a porous plug. The castable repair material 21 is inserted into the gap formed between the replaced porous plug 19 and the damaged porous mass brick 20.
Fill. In addition, castable repair is performed for abnormally damaged portions on the bottom 8 of the ladle.

[0009]

The ladle according to the present embodiment has a capacity of 160 tons / heat, and the operation is always performed using four ladles. The repair time is about 20 minutes, and its contents mainly consist of spraying a ladle wall brick, repairing the bottom (including replacement of a porous plug), and cleaning SN. Here, effects obtained by performing castable repair of the bottom using the hot repair device according to the present invention will be described. The following is a comparison of the porous mass brick life with the conventional one. Although the average life was only about 30 heats with the conventional spraying only around the porous mass, the average life was reduced by using a hot-repair device and repairing with a high-alumina castable, which has particularly high strength. Improved to 45 heats. Here, the repair cycle of the operating bricks of the ladle will be described. After all the repairs, the porous mass bricks and the bricks of the slag line are replaced and all the repairs are performed as an intermediate repair. In other words, the total number of ladle heats was improved from 60 heats only for spraying repair to less than 90 heats by performing bottom castable repair. Thus, the bottom can be castably repaired effectively without heat loss and time loss of the ladle.

[0010]

As described above, the hot ladle inner surface repairing device of the present invention can perform a castable repair of a ladle bottom, which could be repaired only by spraying conventionally, safely by hand. And As a result, hot repair of the ladle bottom was strengthened, the durability of mass bricks and the like was dramatically improved, the ladle life was significantly improved, and the cost of the ladle refractory was reduced. In addition, since it is possible to operate by using a small number of ladles continuously for a long period of time while performing hot repair, the frequency of ladle replacement has been reduced, and the reduction of heavy oil for preheating has been realized.

[Brief description of the drawings]

FIG. 1 is a diagram schematically showing the entire repair device.

FIG. 2 is a diagram showing the capsule front surface and the ladle bottom as viewed from the capsule front surface of the repair device of the present invention.

FIG. 3 is a diagram schematically illustrating an example of wear of a porous plug and a porous mass brick after casting.

FIG. 4 is a diagram schematically showing an example of repairing a porous mass brick after replacing a porous plug.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ladle 2 cart 3 rail 4 capsule 5 balance weight 6 inside 7 water cooling jacket 8 ladle bottom 9 work hatch 10 work hatch 11 work hatch 12 work hatch 13 porous mass brick 14 porous mass brick 15 SN mass brick 16 porous plug 17 porous Mass Bricks 18 Worn Porous Mass Bricks Part 19 Replacement Porous Plug 20 Melted Porous Mass Bricks 21 Castable Repair

Claims (2)

[Claims] 1. In addition to repairing the inside of the ladle by spraying from the front hatch of the capsule loaded in the overturned high-temperature ladle immediately after the waste, castables are used around the porous brick, SN mass brick, and abnormally damaged parts. A method for repairing the inner surface of a hot ladle, comprising repairing from the work hatch. 2. A capsule to be placed in a ladle which has a work space inside, has a work hatch on the forefront, and is tilted and turned over, and has an outer wall heat shielded, and the capsule is placed on a front part thereof. A hot ladle inner surface repairing apparatus, comprising: a carriage having a balance weight at a rear portion thereof and moving on a rail.